| File: | epan/tvbuff.c |
| Warning: | line 425, column 10 Potential leak of memory pointed to by 'buf' |
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| 1 | /* tvbuff.c | |||
| 2 | * | |||
| 3 | * Testy, Virtual(-izable) Buffer of uint8_t*'s | |||
| 4 | * | |||
| 5 | * "Testy" -- the buffer gets mad when an attempt to access data | |||
| 6 | * beyond the bounds of the buffer. An exception is thrown. | |||
| 7 | * | |||
| 8 | * "Virtual" -- the buffer can have its own data, can use a subset of | |||
| 9 | * the data of a backing tvbuff, or can be a composite of | |||
| 10 | * other tvbuffs. | |||
| 11 | * | |||
| 12 | * Copyright (c) 2000 by Gilbert Ramirez <gram@alumni.rice.edu> | |||
| 13 | * | |||
| 14 | * Code to convert IEEE floating point formats to native floating point | |||
| 15 | * derived from code Copyright (c) Ashok Narayanan, 2000 | |||
| 16 | * | |||
| 17 | * Wireshark - Network traffic analyzer | |||
| 18 | * By Gerald Combs <gerald@wireshark.org> | |||
| 19 | * Copyright 1998 Gerald Combs | |||
| 20 | * | |||
| 21 | * SPDX-License-Identifier: GPL-2.0-or-later | |||
| 22 | */ | |||
| 23 | ||||
| 24 | #include "config.h" | |||
| 25 | ||||
| 26 | #include <string.h> | |||
| 27 | #include <stdio.h> | |||
| 28 | #include <errno(*__errno_location ()).h> | |||
| 29 | ||||
| 30 | #include <glib.h> | |||
| 31 | ||||
| 32 | #include "wsutil/pint.h" | |||
| 33 | #include "wsutil/sign_ext.h" | |||
| 34 | #include "wsutil/strtoi.h" | |||
| 35 | #include "wsutil/unicode-utils.h" | |||
| 36 | #include "wsutil/nstime.h" | |||
| 37 | #include "wsutil/time_util.h" | |||
| 38 | #include <wsutil/ws_assert.h> | |||
| 39 | #include "tvbuff.h" | |||
| 40 | #include "tvbuff-int.h" | |||
| 41 | #include "strutil.h" | |||
| 42 | #include "to_str.h" | |||
| 43 | #include "charsets.h" | |||
| 44 | #include "proto.h" /* XXX - only used for DISSECTOR_ASSERT, probably a new header file? */ | |||
| 45 | #include "exceptions.h" | |||
| 46 | ||||
| 47 | #include <time.h> | |||
| 48 | ||||
| 49 | static uint64_t | |||
| 50 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits); | |||
| 51 | ||||
| 52 | static uint64_t | |||
| 53 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits); | |||
| 54 | ||||
| 55 | static inline int | |||
| 56 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const int offset); | |||
| 57 | ||||
| 58 | static inline const uint8_t* | |||
| 59 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length); | |||
| 60 | ||||
| 61 | static inline uint8_t * | |||
| 62 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length); | |||
| 63 | ||||
| 64 | tvbuff_t * | |||
| 65 | tvb_new(const struct tvb_ops *ops) | |||
| 66 | { | |||
| 67 | tvbuff_t *tvb; | |||
| 68 | size_t size = ops->tvb_size; | |||
| 69 | ||||
| 70 | ws_assert(size >= sizeof(*tvb))do { if ((1) && !(size >= sizeof(*tvb))) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 70, __func__, "assertion failed: %s" , "size >= sizeof(*tvb)"); } while (0); | |||
| 71 | ||||
| 72 | tvb = (tvbuff_t *) g_slice_alloc(size); | |||
| 73 | ||||
| 74 | tvb->next = NULL((void*)0); | |||
| 75 | tvb->ops = ops; | |||
| 76 | tvb->initialized = false0; | |||
| 77 | tvb->flags = 0; | |||
| 78 | tvb->length = 0; | |||
| 79 | tvb->reported_length = 0; | |||
| 80 | tvb->contained_length = 0; | |||
| 81 | tvb->real_data = NULL((void*)0); | |||
| 82 | tvb->raw_offset = -1; | |||
| 83 | tvb->ds_tvb = NULL((void*)0); | |||
| 84 | ||||
| 85 | return tvb; | |||
| 86 | } | |||
| 87 | ||||
| 88 | static void | |||
| 89 | tvb_free_internal(tvbuff_t *tvb) | |||
| 90 | { | |||
| 91 | size_t size; | |||
| 92 | ||||
| 93 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 93, "tvb")))); | |||
| 94 | ||||
| 95 | if (tvb->ops->tvb_free) | |||
| 96 | tvb->ops->tvb_free(tvb); | |||
| 97 | ||||
| 98 | size = tvb->ops->tvb_size; | |||
| 99 | ||||
| 100 | g_slice_free1(size, tvb); | |||
| 101 | } | |||
| 102 | ||||
| 103 | /* XXX: just call tvb_free_chain(); | |||
| 104 | * Not removed so that existing dissectors using tvb_free() need not be changed. | |||
| 105 | * I'd argue that existing calls to tvb_free() should have actually beeen | |||
| 106 | * calls to tvb_free_chain() although the calls were OK as long as no | |||
| 107 | * subsets, etc had been created on the tvb. */ | |||
| 108 | void | |||
| 109 | tvb_free(tvbuff_t *tvb) | |||
| 110 | { | |||
| 111 | tvb_free_chain(tvb); | |||
| 112 | } | |||
| 113 | ||||
| 114 | void | |||
| 115 | tvb_free_chain(tvbuff_t *tvb) | |||
| 116 | { | |||
| 117 | tvbuff_t *next_tvb; | |||
| 118 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 118, "tvb")))); | |||
| 119 | while (tvb) { | |||
| 120 | next_tvb = tvb->next; | |||
| 121 | tvb_free_internal(tvb); | |||
| 122 | tvb = next_tvb; | |||
| 123 | } | |||
| 124 | } | |||
| 125 | ||||
| 126 | tvbuff_t * | |||
| 127 | tvb_new_chain(tvbuff_t *parent, tvbuff_t *backing) | |||
| 128 | { | |||
| 129 | tvbuff_t *tvb = tvb_new_proxy(backing); | |||
| 130 | ||||
| 131 | tvb_add_to_chain(parent, tvb); | |||
| 132 | return tvb; | |||
| 133 | } | |||
| 134 | ||||
| 135 | void | |||
| 136 | tvb_add_to_chain(tvbuff_t *parent, tvbuff_t *child) | |||
| 137 | { | |||
| 138 | tvbuff_t *tmp; | |||
| 139 | ||||
| 140 | DISSECTOR_ASSERT(parent)((void) ((parent) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 140, "parent")))); | |||
| 141 | DISSECTOR_ASSERT(child)((void) ((child) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 141, "child")))); | |||
| 142 | ||||
| 143 | while (child) { | |||
| 144 | tmp = child; | |||
| 145 | child = child->next; | |||
| 146 | ||||
| 147 | tmp->next = parent->next; | |||
| 148 | parent->next = tmp; | |||
| 149 | } | |||
| 150 | } | |||
| 151 | ||||
| 152 | /* | |||
| 153 | * Check whether that offset goes more than one byte past the | |||
| 154 | * end of the buffer. | |||
| 155 | * | |||
| 156 | * If not, return 0; otherwise, return exception | |||
| 157 | */ | |||
| 158 | static inline int | |||
| 159 | validate_offset(const tvbuff_t *tvb, const unsigned abs_offset) | |||
| 160 | { | |||
| 161 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) { | |||
| 162 | /* It's OK. */ | |||
| 163 | return 0; | |||
| 164 | } | |||
| 165 | ||||
| 166 | /* | |||
| 167 | * It's not OK, but why? Which boundaries is it | |||
| 168 | * past? | |||
| 169 | */ | |||
| 170 | if (abs_offset <= tvb->contained_length) { | |||
| 171 | /* | |||
| 172 | * It's past the captured length, but not past | |||
| 173 | * the reported end of any parent tvbuffs from | |||
| 174 | * which this is constructed, or the reported | |||
| 175 | * end of this tvbuff, so it's out of bounds | |||
| 176 | * solely because we're past the end of the | |||
| 177 | * captured data. | |||
| 178 | */ | |||
| 179 | return BoundsError1; | |||
| 180 | } | |||
| 181 | ||||
| 182 | /* | |||
| 183 | * There's some actual packet boundary, not just the | |||
| 184 | * artificial boundary imposed by packet slicing, that | |||
| 185 | * we're past. | |||
| 186 | */ | |||
| 187 | ||||
| 188 | if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 189 | /* | |||
| 190 | * This tvbuff is the first fragment of a larger | |||
| 191 | * packet that hasn't been reassembled, so we | |||
| 192 | * assume that's the source of the problem - if | |||
| 193 | * we'd reassembled the packet, we wouldn't have | |||
| 194 | * gone past the end. | |||
| 195 | * | |||
| 196 | * That might not be true, but for at least | |||
| 197 | * some forms of reassembly, such as IP | |||
| 198 | * reassembly, you don't know how big the | |||
| 199 | * reassembled packet is unless you reassemble | |||
| 200 | * it, so, in those cases, we can't determine | |||
| 201 | * whether we would have gone past the end | |||
| 202 | * had we reassembled the packet. | |||
| 203 | */ | |||
| 204 | return FragmentBoundsError4; | |||
| 205 | } | |||
| 206 | ||||
| 207 | /* OK, we're not an unreassembled fragment (that we know of). */ | |||
| 208 | if (abs_offset <= tvb->reported_length) { | |||
| 209 | /* | |||
| 210 | * We're within the bounds of what this tvbuff | |||
| 211 | * purportedly contains, based on some length | |||
| 212 | * value, but we're not within the bounds of | |||
| 213 | * something from which this tvbuff was | |||
| 214 | * extracted, so that length value ran past | |||
| 215 | * the end of some parent tvbuff. | |||
| 216 | */ | |||
| 217 | return ContainedBoundsError2; | |||
| 218 | } | |||
| 219 | ||||
| 220 | /* | |||
| 221 | * OK, it looks as if we ran past the claimed length | |||
| 222 | * of data. | |||
| 223 | */ | |||
| 224 | return ReportedBoundsError3; | |||
| 225 | } | |||
| 226 | ||||
| 227 | static inline int | |||
| 228 | compute_offset(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr) | |||
| 229 | { | |||
| 230 | if (offset >= 0) { | |||
| 231 | /* Positive offset - relative to the beginning of the packet. */ | |||
| 232 | if (G_LIKELY((unsigned) offset <= tvb->length)((unsigned) offset <= tvb->length)) { | |||
| 233 | *offset_ptr = offset; | |||
| 234 | } else if ((unsigned) offset <= tvb->contained_length) { | |||
| 235 | return BoundsError1; | |||
| 236 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 237 | return FragmentBoundsError4; | |||
| 238 | } else if ((unsigned) offset <= tvb->reported_length) { | |||
| 239 | return ContainedBoundsError2; | |||
| 240 | } else { | |||
| 241 | return ReportedBoundsError3; | |||
| 242 | } | |||
| 243 | } | |||
| 244 | else { | |||
| 245 | /* Negative offset - relative to the end of the packet. */ | |||
| 246 | if (G_LIKELY((unsigned) -offset <= tvb->length)((unsigned) -offset <= tvb->length)) { | |||
| 247 | *offset_ptr = tvb->length + offset; | |||
| 248 | } else if ((unsigned) -offset <= tvb->contained_length) { | |||
| 249 | return BoundsError1; | |||
| 250 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 251 | return FragmentBoundsError4; | |||
| 252 | } else if ((unsigned) -offset <= tvb->reported_length) { | |||
| 253 | return ContainedBoundsError2; | |||
| 254 | } else { | |||
| 255 | return ReportedBoundsError3; | |||
| 256 | } | |||
| 257 | } | |||
| 258 | ||||
| 259 | return 0; | |||
| 260 | } | |||
| 261 | ||||
| 262 | static inline int | |||
| 263 | compute_offset_and_remaining(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr, unsigned *rem_len) | |||
| 264 | { | |||
| 265 | int exception; | |||
| 266 | ||||
| 267 | exception = compute_offset(tvb, offset, offset_ptr); | |||
| 268 | if (!exception) | |||
| 269 | *rem_len = tvb->length - *offset_ptr; | |||
| 270 | ||||
| 271 | return exception; | |||
| 272 | } | |||
| 273 | ||||
| 274 | /* Computes the absolute offset and length based on a possibly-negative offset | |||
| 275 | * and a length that is possible -1 (which means "to the end of the data"). | |||
| 276 | * Returns integer indicating whether the offset is in bounds (0) or | |||
| 277 | * not (exception number). The integer ptrs are modified with the new offset, | |||
| 278 | * captured (available) length, and contained length (amount that's present | |||
| 279 | * in the parent tvbuff based on its reported length). | |||
| 280 | * No exception is thrown; on success, we return 0, otherwise we return an | |||
| 281 | * exception for the caller to throw if appropriate. | |||
| 282 | * | |||
| 283 | * XXX - we return success (0), if the offset is positive and right | |||
| 284 | * after the end of the tvbuff (i.e., equal to the length). We do this | |||
| 285 | * so that a dissector constructing a subset tvbuff for the next protocol | |||
| 286 | * will get a zero-length tvbuff, not an exception, if there's no data | |||
| 287 | * left for the next protocol - we want the next protocol to be the one | |||
| 288 | * that gets an exception, so the error is reported as an error in that | |||
| 289 | * protocol rather than the containing protocol. */ | |||
| 290 | static inline int | |||
| 291 | check_offset_length_no_exception(const tvbuff_t *tvb, | |||
| 292 | const int offset, int const length_val, | |||
| 293 | unsigned *offset_ptr, unsigned *length_ptr) | |||
| 294 | { | |||
| 295 | unsigned end_offset; | |||
| 296 | int exception; | |||
| 297 | ||||
| 298 | DISSECTOR_ASSERT(offset_ptr)((void) ((offset_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 298, "offset_ptr" )))); | |||
| 299 | DISSECTOR_ASSERT(length_ptr)((void) ((length_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 299, "length_ptr" )))); | |||
| 300 | ||||
| 301 | /* Compute the offset */ | |||
| 302 | exception = compute_offset(tvb, offset, offset_ptr); | |||
| 303 | if (exception) | |||
| 304 | return exception; | |||
| 305 | ||||
| 306 | if (length_val < -1) { | |||
| 307 | /* XXX - ReportedBoundsError? */ | |||
| 308 | return BoundsError1; | |||
| 309 | } | |||
| 310 | ||||
| 311 | /* Compute the length */ | |||
| 312 | if (length_val == -1) | |||
| 313 | *length_ptr = tvb->length - *offset_ptr; | |||
| 314 | else | |||
| 315 | *length_ptr = length_val; | |||
| 316 | ||||
| 317 | /* | |||
| 318 | * Compute the offset of the first byte past the length. | |||
| 319 | */ | |||
| 320 | end_offset = *offset_ptr + *length_ptr; | |||
| 321 | ||||
| 322 | /* | |||
| 323 | * Check for an overflow | |||
| 324 | */ | |||
| 325 | if (end_offset < *offset_ptr) | |||
| 326 | return BoundsError1; | |||
| 327 | ||||
| 328 | return validate_offset(tvb, end_offset); | |||
| 329 | } | |||
| 330 | ||||
| 331 | /* Checks (+/-) offset and length and throws an exception if | |||
| 332 | * either is out of bounds. Sets integer ptrs to the new offset | |||
| 333 | * and length. */ | |||
| 334 | static inline void | |||
| 335 | check_offset_length(const tvbuff_t *tvb, | |||
| 336 | const int offset, int const length_val, | |||
| 337 | unsigned *offset_ptr, unsigned *length_ptr) | |||
| 338 | { | |||
| 339 | int exception; | |||
| 340 | ||||
| 341 | exception = check_offset_length_no_exception(tvb, offset, length_val, offset_ptr, length_ptr); | |||
| 342 | if (exception) | |||
| 343 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 344 | } | |||
| 345 | ||||
| 346 | void | |||
| 347 | tvb_check_offset_length(const tvbuff_t *tvb, | |||
| 348 | const int offset, int const length_val, | |||
| 349 | unsigned *offset_ptr, unsigned *length_ptr) | |||
| 350 | { | |||
| 351 | check_offset_length(tvb, offset, length_val, offset_ptr, length_ptr); | |||
| 352 | } | |||
| 353 | ||||
| 354 | static const unsigned char left_aligned_bitmask[] = { | |||
| 355 | 0xff, | |||
| 356 | 0x80, | |||
| 357 | 0xc0, | |||
| 358 | 0xe0, | |||
| 359 | 0xf0, | |||
| 360 | 0xf8, | |||
| 361 | 0xfc, | |||
| 362 | 0xfe | |||
| 363 | }; | |||
| 364 | ||||
| 365 | tvbuff_t * | |||
| 366 | tvb_new_octet_aligned(tvbuff_t *tvb, uint32_t bit_offset, int32_t no_of_bits) | |||
| 367 | { | |||
| 368 | tvbuff_t *sub_tvb = NULL((void*)0); | |||
| 369 | uint32_t byte_offset; | |||
| 370 | int32_t datalen, i; | |||
| 371 | uint8_t left, right, remaining_bits, *buf; | |||
| 372 | const uint8_t *data; | |||
| 373 | ||||
| 374 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 374, "tvb && tvb->initialized" )))); | |||
| 375 | ||||
| 376 | byte_offset = bit_offset >> 3; | |||
| 377 | left = bit_offset % 8; /* for left-shifting */ | |||
| 378 | right = 8 - left; /* for right-shifting */ | |||
| 379 | ||||
| 380 | if (no_of_bits == -1) { | |||
| 381 | datalen = _tvb_captured_length_remaining(tvb, byte_offset); | |||
| 382 | remaining_bits = 0; | |||
| 383 | } else { | |||
| 384 | datalen = no_of_bits >> 3; | |||
| 385 | remaining_bits = no_of_bits % 8; | |||
| 386 | if (remaining_bits) { | |||
| 387 | datalen++; | |||
| 388 | } | |||
| 389 | } | |||
| 390 | ||||
| 391 | /* already aligned -> shortcut */ | |||
| 392 | if ((left == 0) && (remaining_bits == 0)) { | |||
| 393 | return tvb_new_subset_length_caplen(tvb, byte_offset, datalen, datalen); | |||
| 394 | } | |||
| 395 | ||||
| 396 | DISSECTOR_ASSERT(datalen>0)((void) ((datalen>0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 396, "datalen>0" )))); | |||
| 397 | ||||
| 398 | /* if at least one trailing byte is available, we must use the content | |||
| 399 | * of that byte for the last shift (i.e. tvb_get_ptr() must use datalen + 1 | |||
| 400 | * if non extra byte is available, the last shifted byte requires | |||
| 401 | * special treatment | |||
| 402 | */ | |||
| 403 | if (_tvb_captured_length_remaining(tvb, byte_offset) > datalen) { | |||
| 404 | data = ensure_contiguous(tvb, byte_offset, datalen + 1); /* tvb_get_ptr */ | |||
| 405 | ||||
| 406 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */ | |||
| 407 | buf = (uint8_t *)g_malloc(datalen); | |||
| 408 | ||||
| 409 | /* shift tvb data bit_offset bits to the left */ | |||
| 410 | for (i = 0; i
| |||
| 411 | buf[i] = (data[i] << left) | (data[i+1] >> right); | |||
| 412 | } else { | |||
| 413 | data = ensure_contiguous(tvb, byte_offset, datalen); /* tvb_get_ptr() */ | |||
| 414 | ||||
| 415 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */ | |||
| 416 | buf = (uint8_t *)g_malloc(datalen); | |||
| 417 | ||||
| 418 | /* shift tvb data bit_offset bits to the left */ | |||
| 419 | for (i = 0; i < (datalen-1); i++) | |||
| 420 | buf[i] = (data[i] << left) | (data[i+1] >> right); | |||
| 421 | buf[datalen-1] = data[datalen-1] << left; /* set last octet */ | |||
| 422 | } | |||
| 423 | buf[datalen-1] &= left_aligned_bitmask[remaining_bits]; | |||
| 424 | ||||
| 425 | sub_tvb = tvb_new_child_real_data(tvb, buf, datalen, datalen); | |||
| ||||
| 426 | tvb_set_free_cb(sub_tvb, g_free); | |||
| 427 | ||||
| 428 | return sub_tvb; | |||
| 429 | } | |||
| 430 | ||||
| 431 | tvbuff_t * | |||
| 432 | tvb_new_octet_right_aligned(tvbuff_t *tvb, uint32_t bit_offset, int32_t no_of_bits) | |||
| 433 | { | |||
| 434 | tvbuff_t *sub_tvb = NULL((void*)0); | |||
| 435 | uint32_t byte_offset; | |||
| 436 | int src_len, dst_len, i; | |||
| 437 | uint8_t left, right, remaining_bits, *buf; | |||
| 438 | const uint8_t *data; | |||
| 439 | ||||
| 440 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 440, "tvb && tvb->initialized" )))); | |||
| 441 | ||||
| 442 | byte_offset = bit_offset / 8; | |||
| 443 | /* right shift to put bits in place and discard least significant bits */ | |||
| 444 | right = bit_offset % 8; | |||
| 445 | /* left shift to get most significant bits from next octet */ | |||
| 446 | left = 8 - right; | |||
| 447 | ||||
| 448 | if (no_of_bits == -1) { | |||
| 449 | dst_len = _tvb_captured_length_remaining(tvb, byte_offset); | |||
| 450 | remaining_bits = 0; | |||
| 451 | } else { | |||
| 452 | dst_len = no_of_bits / 8; | |||
| 453 | remaining_bits = no_of_bits % 8; | |||
| 454 | if (remaining_bits) { | |||
| 455 | dst_len++; | |||
| 456 | } | |||
| 457 | } | |||
| 458 | ||||
| 459 | /* already aligned -> shortcut */ | |||
| 460 | if ((right == 0) && (remaining_bits == 0)) { | |||
| 461 | return tvb_new_subset_length_caplen(tvb, byte_offset, dst_len, dst_len); | |||
| 462 | } | |||
| 463 | ||||
| 464 | DISSECTOR_ASSERT(dst_len>0)((void) ((dst_len>0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 464, "dst_len>0" )))); | |||
| 465 | ||||
| 466 | if (_tvb_captured_length_remaining(tvb, byte_offset) > dst_len) { | |||
| 467 | /* last octet will get data from trailing octet */ | |||
| 468 | src_len = dst_len + 1; | |||
| 469 | } else { | |||
| 470 | /* last octet will be zero padded */ | |||
| 471 | src_len = dst_len; | |||
| 472 | } | |||
| 473 | ||||
| 474 | data = ensure_contiguous(tvb, byte_offset, src_len); /* tvb_get_ptr */ | |||
| 475 | ||||
| 476 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */ | |||
| 477 | buf = (uint8_t *)g_malloc(dst_len); | |||
| 478 | ||||
| 479 | for (i = 0; i < (dst_len - 1); i++) | |||
| 480 | buf[i] = (data[i] >> right) | (data[i+1] << left); | |||
| 481 | ||||
| 482 | /* Special handling for last octet */ | |||
| 483 | buf[i] = (data[i] >> right); | |||
| 484 | /* Shift most significant bits from trailing octet if available */ | |||
| 485 | if (src_len > dst_len) | |||
| 486 | buf[i] |= (data[i+1] << left); | |||
| 487 | /* Preserve only remaining bits in last octet if not multiple of 8 */ | |||
| 488 | if (remaining_bits) | |||
| 489 | buf[i] &= ((1 << remaining_bits) - 1); | |||
| 490 | ||||
| 491 | sub_tvb = tvb_new_child_real_data(tvb, buf, dst_len, dst_len); | |||
| 492 | tvb_set_free_cb(sub_tvb, g_free); | |||
| 493 | ||||
| 494 | return sub_tvb; | |||
| 495 | } | |||
| 496 | ||||
| 497 | static tvbuff_t * | |||
| 498 | tvb_generic_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len) | |||
| 499 | { | |||
| 500 | tvbuff_t *cloned_tvb; | |||
| 501 | uint8_t *data; | |||
| 502 | ||||
| 503 | DISSECTOR_ASSERT(tvb_bytes_exist(tvb, offset, len))((void) ((tvb_bytes_exist(tvb, offset, len)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 503, "tvb_bytes_exist(tvb, offset, len)" )))); | |||
| 504 | ||||
| 505 | data = (uint8_t *) g_malloc(len); | |||
| 506 | ||||
| 507 | tvb_memcpy(tvb, data, offset, len); | |||
| 508 | ||||
| 509 | cloned_tvb = tvb_new_real_data(data, len, len); | |||
| 510 | tvb_set_free_cb(cloned_tvb, g_free); | |||
| 511 | ||||
| 512 | return cloned_tvb; | |||
| 513 | } | |||
| 514 | ||||
| 515 | tvbuff_t * | |||
| 516 | tvb_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len) | |||
| 517 | { | |||
| 518 | if (tvb->ops->tvb_clone) { | |||
| 519 | tvbuff_t *cloned_tvb; | |||
| 520 | ||||
| 521 | cloned_tvb = tvb->ops->tvb_clone(tvb, offset, len); | |||
| 522 | if (cloned_tvb) | |||
| 523 | return cloned_tvb; | |||
| 524 | } | |||
| 525 | ||||
| 526 | return tvb_generic_clone_offset_len(tvb, offset, len); | |||
| 527 | } | |||
| 528 | ||||
| 529 | tvbuff_t * | |||
| 530 | tvb_clone(tvbuff_t *tvb) | |||
| 531 | { | |||
| 532 | return tvb_clone_offset_len(tvb, 0, tvb->length); | |||
| 533 | } | |||
| 534 | ||||
| 535 | unsigned | |||
| 536 | tvb_captured_length(const tvbuff_t *tvb) | |||
| 537 | { | |||
| 538 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 538, "tvb && tvb->initialized" )))); | |||
| 539 | ||||
| 540 | return tvb->length; | |||
| 541 | } | |||
| 542 | ||||
| 543 | /* For tvbuff internal use */ | |||
| 544 | static inline int | |||
| 545 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const int offset) | |||
| 546 | { | |||
| 547 | unsigned abs_offset = 0, rem_length; | |||
| 548 | int exception; | |||
| 549 | ||||
| 550 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &rem_length); | |||
| 551 | if (exception) | |||
| 552 | return 0; | |||
| 553 | ||||
| 554 | return rem_length; | |||
| 555 | } | |||
| 556 | ||||
| 557 | int | |||
| 558 | tvb_captured_length_remaining(const tvbuff_t *tvb, const int offset) | |||
| 559 | { | |||
| 560 | unsigned abs_offset = 0, rem_length; | |||
| 561 | int exception; | |||
| 562 | ||||
| 563 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 563, "tvb && tvb->initialized" )))); | |||
| 564 | ||||
| 565 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &rem_length); | |||
| 566 | if (exception) | |||
| 567 | return 0; | |||
| 568 | ||||
| 569 | return rem_length; | |||
| 570 | } | |||
| 571 | ||||
| 572 | unsigned | |||
| 573 | tvb_ensure_captured_length_remaining(const tvbuff_t *tvb, const int offset) | |||
| 574 | { | |||
| 575 | unsigned abs_offset = 0, rem_length = 0; | |||
| 576 | int exception; | |||
| 577 | ||||
| 578 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 578, "tvb && tvb->initialized" )))); | |||
| 579 | ||||
| 580 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &rem_length); | |||
| 581 | if (exception) | |||
| 582 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 583 | ||||
| 584 | if (rem_length == 0) { | |||
| 585 | /* | |||
| 586 | * This routine ensures there's at least one byte available. | |||
| 587 | * There aren't any bytes available, so throw the appropriate | |||
| 588 | * exception. | |||
| 589 | */ | |||
| 590 | if (abs_offset < tvb->contained_length) { | |||
| 591 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 592 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 593 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 594 | } else if (abs_offset < tvb->reported_length) { | |||
| 595 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 596 | } else { | |||
| 597 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 598 | } | |||
| 599 | } | |||
| 600 | return rem_length; | |||
| 601 | } | |||
| 602 | ||||
| 603 | /* Validates that 'length' bytes are available starting from | |||
| 604 | * offset (pos/neg). Does not throw an exception. */ | |||
| 605 | bool_Bool | |||
| 606 | tvb_bytes_exist(const tvbuff_t *tvb, const int offset, const int length) | |||
| 607 | { | |||
| 608 | unsigned abs_offset = 0, abs_length; | |||
| 609 | int exception; | |||
| 610 | ||||
| 611 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 611, "tvb && tvb->initialized" )))); | |||
| 612 | ||||
| 613 | /* | |||
| 614 | * Negative lengths are not possible and indicate a bug (e.g. arithmetic | |||
| 615 | * error or an overly large value from packet data). | |||
| 616 | */ | |||
| 617 | if (length < 0) | |||
| 618 | return false0; | |||
| 619 | ||||
| 620 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length); | |||
| 621 | if (exception) | |||
| 622 | return false0; | |||
| 623 | ||||
| 624 | return true1; | |||
| 625 | } | |||
| 626 | ||||
| 627 | /* Validates that 'length' bytes, where 'length' is a 64-bit unsigned | |||
| 628 | * integer, are available starting from offset (pos/neg). Throws an | |||
| 629 | * exception if they aren't. */ | |||
| 630 | void | |||
| 631 | tvb_ensure_bytes_exist64(const tvbuff_t *tvb, const int offset, const uint64_t length) | |||
| 632 | { | |||
| 633 | /* | |||
| 634 | * Make sure the value fits in a signed integer; if not, assume | |||
| 635 | * that means that it's too big. | |||
| 636 | */ | |||
| 637 | if (length > INT_MAX2147483647) { | |||
| 638 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 639 | } | |||
| 640 | ||||
| 641 | /* OK, now cast it and try it with tvb_ensure_bytes_exist(). */ | |||
| 642 | tvb_ensure_bytes_exist(tvb, offset, (int)length); | |||
| 643 | } | |||
| 644 | ||||
| 645 | /* Validates that 'length' bytes are available starting from | |||
| 646 | * offset (pos/neg). Throws an exception if they aren't. */ | |||
| 647 | void | |||
| 648 | tvb_ensure_bytes_exist(const tvbuff_t *tvb, const int offset, const int length) | |||
| 649 | { | |||
| 650 | unsigned real_offset, end_offset; | |||
| 651 | ||||
| 652 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 652, "tvb && tvb->initialized" )))); | |||
| 653 | ||||
| 654 | /* | |||
| 655 | * -1 doesn't mean "until end of buffer", as that's pointless | |||
| 656 | * for this routine. We must treat it as a Really Large Positive | |||
| 657 | * Number, so that we throw an exception; we throw | |||
| 658 | * ReportedBoundsError, as if it were past even the end of a | |||
| 659 | * reassembled packet, and past the end of even the data we | |||
| 660 | * didn't capture. | |||
| 661 | * | |||
| 662 | * We do the same with other negative lengths. | |||
| 663 | */ | |||
| 664 | if (length < 0) { | |||
| 665 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 666 | } | |||
| 667 | ||||
| 668 | /* XXX: Below this point could be replaced with a call to | |||
| 669 | * check_offset_length with no functional change, however this is a | |||
| 670 | * *very* hot path and check_offset_length is not well-optimized for | |||
| 671 | * this case, so we eat some code duplication for a lot of speedup. */ | |||
| 672 | ||||
| 673 | if (offset >= 0) { | |||
| 674 | /* Positive offset - relative to the beginning of the packet. */ | |||
| 675 | if (G_LIKELY((unsigned) offset <= tvb->length)((unsigned) offset <= tvb->length)) { | |||
| 676 | real_offset = offset; | |||
| 677 | } else if ((unsigned) offset <= tvb->contained_length) { | |||
| 678 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 679 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 680 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 681 | } else if ((unsigned) offset <= tvb->reported_length) { | |||
| 682 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 683 | } else { | |||
| 684 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 685 | } | |||
| 686 | } | |||
| 687 | else { | |||
| 688 | /* Negative offset - relative to the end of the packet. */ | |||
| 689 | if (G_LIKELY((unsigned) -offset <= tvb->length)((unsigned) -offset <= tvb->length)) { | |||
| 690 | real_offset = tvb->length + offset; | |||
| 691 | } else if ((unsigned) -offset <= tvb->contained_length) { | |||
| 692 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 693 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 694 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 695 | } else if ((unsigned) -offset <= tvb->reported_length) { | |||
| 696 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 697 | } else { | |||
| 698 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 699 | } | |||
| 700 | } | |||
| 701 | ||||
| 702 | /* | |||
| 703 | * Compute the offset of the first byte past the length. | |||
| 704 | */ | |||
| 705 | end_offset = real_offset + length; | |||
| 706 | ||||
| 707 | /* | |||
| 708 | * Check for an overflow | |||
| 709 | */ | |||
| 710 | if (end_offset < real_offset) | |||
| 711 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 712 | ||||
| 713 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) | |||
| 714 | return; | |||
| 715 | else if (end_offset <= tvb->contained_length) | |||
| 716 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 717 | else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) | |||
| 718 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 719 | else if (end_offset <= tvb->reported_length) | |||
| 720 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 721 | else | |||
| 722 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 723 | } | |||
| 724 | ||||
| 725 | bool_Bool | |||
| 726 | tvb_offset_exists(const tvbuff_t *tvb, const int offset) | |||
| 727 | { | |||
| 728 | unsigned abs_offset = 0; | |||
| 729 | int exception; | |||
| 730 | ||||
| 731 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 731, "tvb && tvb->initialized" )))); | |||
| 732 | ||||
| 733 | exception = compute_offset(tvb, offset, &abs_offset); | |||
| 734 | if (exception) | |||
| 735 | return false0; | |||
| 736 | ||||
| 737 | /* compute_offset only throws an exception on >, not >= because of the | |||
| 738 | * comment above check_offset_length_no_exception, but here we want the | |||
| 739 | * opposite behaviour so we check ourselves... */ | |||
| 740 | return abs_offset < tvb->length; | |||
| 741 | } | |||
| 742 | ||||
| 743 | unsigned | |||
| 744 | tvb_reported_length(const tvbuff_t *tvb) | |||
| 745 | { | |||
| 746 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 746, "tvb && tvb->initialized" )))); | |||
| 747 | ||||
| 748 | return tvb->reported_length; | |||
| 749 | } | |||
| 750 | ||||
| 751 | int | |||
| 752 | tvb_reported_length_remaining(const tvbuff_t *tvb, const int offset) | |||
| 753 | { | |||
| 754 | unsigned abs_offset = 0; | |||
| 755 | int exception; | |||
| 756 | ||||
| 757 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 757, "tvb && tvb->initialized" )))); | |||
| 758 | ||||
| 759 | exception = compute_offset(tvb, offset, &abs_offset); | |||
| 760 | if (exception) | |||
| 761 | return 0; | |||
| 762 | ||||
| 763 | if (tvb->reported_length >= abs_offset) | |||
| 764 | return tvb->reported_length - abs_offset; | |||
| 765 | else | |||
| 766 | return 0; | |||
| 767 | } | |||
| 768 | ||||
| 769 | unsigned | |||
| 770 | tvb_ensure_reported_length_remaining(const tvbuff_t *tvb, const int offset) | |||
| 771 | { | |||
| 772 | unsigned abs_offset = 0; | |||
| 773 | int exception; | |||
| 774 | ||||
| 775 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 775, "tvb && tvb->initialized" )))); | |||
| 776 | ||||
| 777 | exception = compute_offset(tvb, offset, &abs_offset); | |||
| 778 | if (exception) | |||
| 779 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 780 | ||||
| 781 | if (tvb->reported_length >= abs_offset) | |||
| 782 | return tvb->reported_length - abs_offset; | |||
| 783 | else | |||
| 784 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 785 | } | |||
| 786 | ||||
| 787 | /* Set the reported length of a tvbuff to a given value; used for protocols | |||
| 788 | * whose headers contain an explicit length and where the calling | |||
| 789 | * dissector's payload may include padding as well as the packet for | |||
| 790 | * this protocol. | |||
| 791 | * Also adjusts the available and contained length. */ | |||
| 792 | void | |||
| 793 | tvb_set_reported_length(tvbuff_t *tvb, const unsigned reported_length) | |||
| 794 | { | |||
| 795 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 795, "tvb && tvb->initialized" )))); | |||
| 796 | ||||
| 797 | if (reported_length > tvb->reported_length) | |||
| 798 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 799 | ||||
| 800 | tvb->reported_length = reported_length; | |||
| 801 | if (reported_length < tvb->length) | |||
| 802 | tvb->length = reported_length; | |||
| 803 | if (reported_length < tvb->contained_length) | |||
| 804 | tvb->contained_length = reported_length; | |||
| 805 | } | |||
| 806 | ||||
| 807 | /* Repair a tvbuff where the captured length is greater than the | |||
| 808 | * reported length; such a tvbuff makes no sense, as it's impossible | |||
| 809 | * to capture more data than is in the packet. | |||
| 810 | */ | |||
| 811 | void | |||
| 812 | tvb_fix_reported_length(tvbuff_t *tvb) | |||
| 813 | { | |||
| 814 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 814, "tvb && tvb->initialized" )))); | |||
| 815 | DISSECTOR_ASSERT(tvb->reported_length < tvb->length)((void) ((tvb->reported_length < tvb->length) ? (void )0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 815, "tvb->reported_length < tvb->length" )))); | |||
| 816 | ||||
| 817 | tvb->reported_length = tvb->length; | |||
| 818 | if (tvb->contained_length < tvb->length) | |||
| 819 | tvb->contained_length = tvb->length; | |||
| 820 | } | |||
| 821 | ||||
| 822 | unsigned | |||
| 823 | tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const unsigned counter) | |||
| 824 | { | |||
| 825 | if (tvb->ops->tvb_offset) | |||
| 826 | return tvb->ops->tvb_offset(tvb, counter); | |||
| 827 | ||||
| 828 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 828)); | |||
| 829 | return 0; | |||
| 830 | } | |||
| 831 | ||||
| 832 | unsigned | |||
| 833 | tvb_offset_from_real_beginning(const tvbuff_t *tvb) | |||
| 834 | { | |||
| 835 | return tvb_offset_from_real_beginning_counter(tvb, 0); | |||
| 836 | } | |||
| 837 | ||||
| 838 | static inline const uint8_t* | |||
| 839 | ensure_contiguous_no_exception(tvbuff_t *tvb, const int offset, const int length, int *pexception) | |||
| 840 | { | |||
| 841 | unsigned abs_offset = 0, abs_length = 0; | |||
| 842 | int exception; | |||
| 843 | ||||
| 844 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length); | |||
| 845 | if (exception) { | |||
| 846 | if (pexception) | |||
| 847 | *pexception = exception; | |||
| 848 | return NULL((void*)0); | |||
| 849 | } | |||
| 850 | ||||
| 851 | /* | |||
| 852 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data, | |||
| 853 | * then it is acceptable to have an empty tvb (!tvb->real_data). | |||
| 854 | */ | |||
| 855 | if (length == 0) { | |||
| 856 | return NULL((void*)0); | |||
| 857 | } | |||
| 858 | ||||
| 859 | /* | |||
| 860 | * We know that all the data is present in the tvbuff, so | |||
| 861 | * no exceptions should be thrown. | |||
| 862 | */ | |||
| 863 | if (tvb->real_data) | |||
| 864 | return tvb->real_data + abs_offset; | |||
| 865 | ||||
| 866 | if (tvb->ops->tvb_get_ptr) | |||
| 867 | return tvb->ops->tvb_get_ptr(tvb, abs_offset, abs_length); | |||
| 868 | ||||
| 869 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 869)); | |||
| 870 | return NULL((void*)0); | |||
| 871 | } | |||
| 872 | ||||
| 873 | static inline const uint8_t* | |||
| 874 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length) | |||
| 875 | { | |||
| 876 | int exception = 0; | |||
| 877 | const uint8_t *p; | |||
| 878 | ||||
| 879 | p = ensure_contiguous_no_exception(tvb, offset, length, &exception); | |||
| 880 | if (p == NULL((void*)0) && length != 0) { | |||
| 881 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 881, "exception > 0" )))); | |||
| 882 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 883 | } | |||
| 884 | return p; | |||
| 885 | } | |||
| 886 | ||||
| 887 | static inline const uint8_t* | |||
| 888 | fast_ensure_contiguous(tvbuff_t *tvb, const int offset, const unsigned length) | |||
| 889 | { | |||
| 890 | unsigned end_offset; | |||
| 891 | unsigned u_offset; | |||
| 892 | ||||
| 893 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 893, "tvb && tvb->initialized" )))); | |||
| 894 | /* We don't check for overflow in this fast path so we only handle simple types */ | |||
| 895 | DISSECTOR_ASSERT(length <= 8)((void) ((length <= 8) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 895, "length <= 8" )))); | |||
| 896 | ||||
| 897 | if (offset < 0 || !tvb->real_data) { | |||
| 898 | return ensure_contiguous(tvb, offset, length); | |||
| 899 | } | |||
| 900 | ||||
| 901 | u_offset = offset; | |||
| 902 | end_offset = u_offset + length; | |||
| 903 | ||||
| 904 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) { | |||
| 905 | return tvb->real_data + u_offset; | |||
| 906 | } else if (end_offset <= tvb->contained_length) { | |||
| 907 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 908 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 909 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 910 | } else if (end_offset <= tvb->reported_length) { | |||
| 911 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 912 | } else { | |||
| 913 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 914 | } | |||
| 915 | /* not reached */ | |||
| 916 | return NULL((void*)0); | |||
| 917 | } | |||
| 918 | ||||
| 919 | ||||
| 920 | ||||
| 921 | /************** ACCESSORS **************/ | |||
| 922 | ||||
| 923 | void * | |||
| 924 | tvb_memcpy(tvbuff_t *tvb, void *target, const int offset, size_t length) | |||
| 925 | { | |||
| 926 | unsigned abs_offset = 0, abs_length = 0; | |||
| 927 | ||||
| 928 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 928, "tvb && tvb->initialized" )))); | |||
| 929 | ||||
| 930 | /* | |||
| 931 | * XXX - we should eliminate the "length = -1 means 'to the end | |||
| 932 | * of the tvbuff'" convention, and use other means to achieve | |||
| 933 | * that; this would let us eliminate a bunch of checks for | |||
| 934 | * negative lengths in cases where the protocol has a 32-bit | |||
| 935 | * length field. | |||
| 936 | * | |||
| 937 | * Allowing -1 but throwing an assertion on other negative | |||
| 938 | * lengths is a bit more work with the length being a size_t; | |||
| 939 | * instead, we check for a length <= 2^31-1. | |||
| 940 | */ | |||
| 941 | DISSECTOR_ASSERT(length <= 0x7FFFFFFF)((void) ((length <= 0x7FFFFFFF) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 941, "length <= 0x7FFFFFFF" )))); | |||
| 942 | check_offset_length(tvb, offset, (int) length, &abs_offset, &abs_length); | |||
| 943 | ||||
| 944 | if (target && tvb->real_data) { | |||
| 945 | return memcpy(target, tvb->real_data + abs_offset, abs_length); | |||
| 946 | } | |||
| 947 | ||||
| 948 | if (target && tvb->ops->tvb_memcpy) | |||
| 949 | return tvb->ops->tvb_memcpy(tvb, target, abs_offset, abs_length); | |||
| 950 | ||||
| 951 | /* | |||
| 952 | * If the length is 0, there's nothing to do. | |||
| 953 | * (tvb->real_data could be null if it's allocated with | |||
| 954 | * a size of length.) | |||
| 955 | */ | |||
| 956 | if (length != 0) { | |||
| 957 | /* | |||
| 958 | * XXX, fallback to slower method | |||
| 959 | */ | |||
| 960 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 960)); | |||
| 961 | } | |||
| 962 | return NULL((void*)0); | |||
| 963 | } | |||
| 964 | ||||
| 965 | ||||
| 966 | /* | |||
| 967 | * XXX - this doesn't treat a length of -1 as an error. | |||
| 968 | * If it did, this could replace some code that calls | |||
| 969 | * "tvb_ensure_bytes_exist()" and then allocates a buffer and copies | |||
| 970 | * data to it. | |||
| 971 | * | |||
| 972 | * "composite_get_ptr()" depends on -1 not being | |||
| 973 | * an error; does anything else depend on this routine treating -1 as | |||
| 974 | * meaning "to the end of the buffer"? | |||
| 975 | * | |||
| 976 | * If scope is NULL, memory is allocated with g_malloc() and user must | |||
| 977 | * explicitly free it with g_free(). | |||
| 978 | * If scope is not NULL, memory is allocated with the corresponding pool | |||
| 979 | * lifetime. | |||
| 980 | */ | |||
| 981 | void * | |||
| 982 | tvb_memdup(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, size_t length) | |||
| 983 | { | |||
| 984 | unsigned abs_offset = 0, abs_length = 0; | |||
| 985 | void *duped; | |||
| 986 | ||||
| 987 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 987, "tvb && tvb->initialized" )))); | |||
| 988 | ||||
| 989 | check_offset_length(tvb, offset, (int) length, &abs_offset, &abs_length); | |||
| 990 | ||||
| 991 | if (abs_length == 0) | |||
| 992 | return NULL((void*)0); | |||
| 993 | ||||
| 994 | duped = wmem_alloc(scope, abs_length); | |||
| 995 | return tvb_memcpy(tvb, duped, abs_offset, abs_length); | |||
| 996 | } | |||
| 997 | ||||
| 998 | ||||
| 999 | ||||
| 1000 | const uint8_t* | |||
| 1001 | tvb_get_ptr(tvbuff_t *tvb, const int offset, const int length) | |||
| 1002 | { | |||
| 1003 | return ensure_contiguous(tvb, offset, length); | |||
| 1004 | } | |||
| 1005 | ||||
| 1006 | /* ---------------- */ | |||
| 1007 | uint8_t | |||
| 1008 | tvb_get_uint8(tvbuff_t *tvb, const int offset) | |||
| 1009 | { | |||
| 1010 | const uint8_t *ptr; | |||
| 1011 | ||||
| 1012 | ptr = fast_ensure_contiguous(tvb, offset, 1); | |||
| 1013 | return *ptr; | |||
| 1014 | } | |||
| 1015 | ||||
| 1016 | int8_t | |||
| 1017 | tvb_get_int8(tvbuff_t *tvb, const int offset) | |||
| 1018 | { | |||
| 1019 | const uint8_t *ptr; | |||
| 1020 | ||||
| 1021 | ptr = fast_ensure_contiguous(tvb, offset, 1); | |||
| 1022 | return *ptr; | |||
| 1023 | } | |||
| 1024 | ||||
| 1025 | uint16_t | |||
| 1026 | tvb_get_ntohs(tvbuff_t *tvb, const int offset) | |||
| 1027 | { | |||
| 1028 | const uint8_t *ptr; | |||
| 1029 | ||||
| 1030 | ptr = fast_ensure_contiguous(tvb, offset, 2); | |||
| 1031 | return pntoh16(ptr); | |||
| 1032 | } | |||
| 1033 | ||||
| 1034 | int16_t | |||
| 1035 | tvb_get_ntohis(tvbuff_t *tvb, const int offset) | |||
| 1036 | { | |||
| 1037 | const uint8_t *ptr; | |||
| 1038 | ||||
| 1039 | ptr = fast_ensure_contiguous(tvb, offset, 2); | |||
| 1040 | return pntoh16(ptr); | |||
| 1041 | } | |||
| 1042 | ||||
| 1043 | uint32_t | |||
| 1044 | tvb_get_ntoh24(tvbuff_t *tvb, const int offset) | |||
| 1045 | { | |||
| 1046 | const uint8_t *ptr; | |||
| 1047 | ||||
| 1048 | ptr = fast_ensure_contiguous(tvb, offset, 3); | |||
| 1049 | return pntoh24(ptr); | |||
| 1050 | } | |||
| 1051 | ||||
| 1052 | int32_t | |||
| 1053 | tvb_get_ntohi24(tvbuff_t *tvb, const int offset) | |||
| 1054 | { | |||
| 1055 | uint32_t ret; | |||
| 1056 | ||||
| 1057 | ret = ws_sign_ext32(tvb_get_ntoh24(tvb, offset), 24); | |||
| 1058 | ||||
| 1059 | return (int32_t)ret; | |||
| 1060 | } | |||
| 1061 | ||||
| 1062 | uint32_t | |||
| 1063 | tvb_get_ntohl(tvbuff_t *tvb, const int offset) | |||
| 1064 | { | |||
| 1065 | const uint8_t *ptr; | |||
| 1066 | ||||
| 1067 | ptr = fast_ensure_contiguous(tvb, offset, 4); | |||
| 1068 | return pntoh32(ptr); | |||
| 1069 | } | |||
| 1070 | ||||
| 1071 | int32_t | |||
| 1072 | tvb_get_ntohil(tvbuff_t *tvb, const int offset) | |||
| 1073 | { | |||
| 1074 | const uint8_t *ptr; | |||
| 1075 | ||||
| 1076 | ptr = fast_ensure_contiguous(tvb, offset, 4); | |||
| 1077 | return pntoh32(ptr); | |||
| 1078 | } | |||
| 1079 | ||||
| 1080 | uint64_t | |||
| 1081 | tvb_get_ntoh40(tvbuff_t *tvb, const int offset) | |||
| 1082 | { | |||
| 1083 | const uint8_t *ptr; | |||
| 1084 | ||||
| 1085 | ptr = fast_ensure_contiguous(tvb, offset, 5); | |||
| 1086 | return pntoh40(ptr); | |||
| 1087 | } | |||
| 1088 | ||||
| 1089 | int64_t | |||
| 1090 | tvb_get_ntohi40(tvbuff_t *tvb, const int offset) | |||
| 1091 | { | |||
| 1092 | uint64_t ret; | |||
| 1093 | ||||
| 1094 | ret = ws_sign_ext64(tvb_get_ntoh40(tvb, offset), 40); | |||
| 1095 | ||||
| 1096 | return (int64_t)ret; | |||
| 1097 | } | |||
| 1098 | ||||
| 1099 | uint64_t | |||
| 1100 | tvb_get_ntoh48(tvbuff_t *tvb, const int offset) | |||
| 1101 | { | |||
| 1102 | const uint8_t *ptr; | |||
| 1103 | ||||
| 1104 | ptr = fast_ensure_contiguous(tvb, offset, 6); | |||
| 1105 | return pntoh48(ptr); | |||
| 1106 | } | |||
| 1107 | ||||
| 1108 | int64_t | |||
| 1109 | tvb_get_ntohi48(tvbuff_t *tvb, const int offset) | |||
| 1110 | { | |||
| 1111 | uint64_t ret; | |||
| 1112 | ||||
| 1113 | ret = ws_sign_ext64(tvb_get_ntoh48(tvb, offset), 48); | |||
| 1114 | ||||
| 1115 | return (int64_t)ret; | |||
| 1116 | } | |||
| 1117 | ||||
| 1118 | uint64_t | |||
| 1119 | tvb_get_ntoh56(tvbuff_t *tvb, const int offset) | |||
| 1120 | { | |||
| 1121 | const uint8_t *ptr; | |||
| 1122 | ||||
| 1123 | ptr = fast_ensure_contiguous(tvb, offset, 7); | |||
| 1124 | return pntoh56(ptr); | |||
| 1125 | } | |||
| 1126 | ||||
| 1127 | int64_t | |||
| 1128 | tvb_get_ntohi56(tvbuff_t *tvb, const int offset) | |||
| 1129 | { | |||
| 1130 | uint64_t ret; | |||
| 1131 | ||||
| 1132 | ret = ws_sign_ext64(tvb_get_ntoh56(tvb, offset), 56); | |||
| 1133 | ||||
| 1134 | return (int64_t)ret; | |||
| 1135 | } | |||
| 1136 | ||||
| 1137 | uint64_t | |||
| 1138 | tvb_get_ntoh64(tvbuff_t *tvb, const int offset) | |||
| 1139 | { | |||
| 1140 | const uint8_t *ptr; | |||
| 1141 | ||||
| 1142 | ptr = fast_ensure_contiguous(tvb, offset, 8); | |||
| 1143 | return pntoh64(ptr); | |||
| 1144 | } | |||
| 1145 | ||||
| 1146 | int64_t | |||
| 1147 | tvb_get_ntohi64(tvbuff_t *tvb, const int offset) | |||
| 1148 | { | |||
| 1149 | const uint8_t *ptr; | |||
| 1150 | ||||
| 1151 | ptr = fast_ensure_contiguous(tvb, offset, 8); | |||
| 1152 | return pntoh64(ptr); | |||
| 1153 | } | |||
| 1154 | ||||
| 1155 | uint16_t | |||
| 1156 | tvb_get_uint16(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1157 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1158 | return tvb_get_letohs(tvb, offset); | |||
| 1159 | } else { | |||
| 1160 | return tvb_get_ntohs(tvb, offset); | |||
| 1161 | } | |||
| 1162 | } | |||
| 1163 | ||||
| 1164 | int16_t | |||
| 1165 | tvb_get_int16(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1166 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1167 | return tvb_get_letohis(tvb, offset); | |||
| 1168 | } else { | |||
| 1169 | return tvb_get_ntohis(tvb, offset); | |||
| 1170 | } | |||
| 1171 | } | |||
| 1172 | ||||
| 1173 | uint32_t | |||
| 1174 | tvb_get_uint24(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1175 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1176 | return tvb_get_letoh24(tvb, offset); | |||
| 1177 | } else { | |||
| 1178 | return tvb_get_ntoh24(tvb, offset); | |||
| 1179 | } | |||
| 1180 | } | |||
| 1181 | ||||
| 1182 | int32_t | |||
| 1183 | tvb_get_int24(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1184 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1185 | return tvb_get_letohi24(tvb, offset); | |||
| 1186 | } else { | |||
| 1187 | return tvb_get_ntohi24(tvb, offset); | |||
| 1188 | } | |||
| 1189 | } | |||
| 1190 | ||||
| 1191 | uint32_t | |||
| 1192 | tvb_get_uint32(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1193 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1194 | return tvb_get_letohl(tvb, offset); | |||
| 1195 | } else { | |||
| 1196 | return tvb_get_ntohl(tvb, offset); | |||
| 1197 | } | |||
| 1198 | } | |||
| 1199 | ||||
| 1200 | int32_t | |||
| 1201 | tvb_get_int32(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1202 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1203 | return tvb_get_letohil(tvb, offset); | |||
| 1204 | } else { | |||
| 1205 | return tvb_get_ntohil(tvb, offset); | |||
| 1206 | } | |||
| 1207 | } | |||
| 1208 | ||||
| 1209 | uint64_t | |||
| 1210 | tvb_get_uint40(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1211 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1212 | return tvb_get_letoh40(tvb, offset); | |||
| 1213 | } else { | |||
| 1214 | return tvb_get_ntoh40(tvb, offset); | |||
| 1215 | } | |||
| 1216 | } | |||
| 1217 | ||||
| 1218 | int64_t | |||
| 1219 | tvb_get_int40(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1220 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1221 | return tvb_get_letohi40(tvb, offset); | |||
| 1222 | } else { | |||
| 1223 | return tvb_get_ntohi40(tvb, offset); | |||
| 1224 | } | |||
| 1225 | } | |||
| 1226 | ||||
| 1227 | uint64_t | |||
| 1228 | tvb_get_uint48(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1229 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1230 | return tvb_get_letoh48(tvb, offset); | |||
| 1231 | } else { | |||
| 1232 | return tvb_get_ntoh48(tvb, offset); | |||
| 1233 | } | |||
| 1234 | } | |||
| 1235 | ||||
| 1236 | int64_t | |||
| 1237 | tvb_get_int48(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1238 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1239 | return tvb_get_letohi48(tvb, offset); | |||
| 1240 | } else { | |||
| 1241 | return tvb_get_ntohi48(tvb, offset); | |||
| 1242 | } | |||
| 1243 | } | |||
| 1244 | ||||
| 1245 | uint64_t | |||
| 1246 | tvb_get_uint56(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1247 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1248 | return tvb_get_letoh56(tvb, offset); | |||
| 1249 | } else { | |||
| 1250 | return tvb_get_ntoh56(tvb, offset); | |||
| 1251 | } | |||
| 1252 | } | |||
| 1253 | ||||
| 1254 | int64_t | |||
| 1255 | tvb_get_int56(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1256 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1257 | return tvb_get_letohi56(tvb, offset); | |||
| 1258 | } else { | |||
| 1259 | return tvb_get_ntohi56(tvb, offset); | |||
| 1260 | } | |||
| 1261 | } | |||
| 1262 | ||||
| 1263 | uint64_t | |||
| 1264 | tvb_get_uint64(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1265 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1266 | return tvb_get_letoh64(tvb, offset); | |||
| 1267 | } else { | |||
| 1268 | return tvb_get_ntoh64(tvb, offset); | |||
| 1269 | } | |||
| 1270 | } | |||
| 1271 | ||||
| 1272 | uint64_t | |||
| 1273 | tvb_get_uint64_with_length(tvbuff_t *tvb, const int offset, unsigned length, const unsigned encoding) | |||
| 1274 | { | |||
| 1275 | uint64_t value; | |||
| 1276 | ||||
| 1277 | switch (length) { | |||
| 1278 | ||||
| 1279 | case 1: | |||
| 1280 | value = tvb_get_uint8(tvb, offset); | |||
| 1281 | break; | |||
| 1282 | ||||
| 1283 | case 2: | |||
| 1284 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohs(tvb, offset) | |||
| 1285 | : tvb_get_ntohs(tvb, offset); | |||
| 1286 | break; | |||
| 1287 | ||||
| 1288 | case 3: | |||
| 1289 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh24(tvb, offset) | |||
| 1290 | : tvb_get_ntoh24(tvb, offset); | |||
| 1291 | break; | |||
| 1292 | ||||
| 1293 | case 4: | |||
| 1294 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohl(tvb, offset) | |||
| 1295 | : tvb_get_ntohl(tvb, offset); | |||
| 1296 | break; | |||
| 1297 | ||||
| 1298 | case 5: | |||
| 1299 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh40(tvb, offset) | |||
| 1300 | : tvb_get_ntoh40(tvb, offset); | |||
| 1301 | break; | |||
| 1302 | ||||
| 1303 | case 6: | |||
| 1304 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh48(tvb, offset) | |||
| 1305 | : tvb_get_ntoh48(tvb, offset); | |||
| 1306 | break; | |||
| 1307 | ||||
| 1308 | case 7: | |||
| 1309 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh56(tvb, offset) | |||
| 1310 | : tvb_get_ntoh56(tvb, offset); | |||
| 1311 | break; | |||
| 1312 | ||||
| 1313 | case 8: | |||
| 1314 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset) | |||
| 1315 | : tvb_get_ntoh64(tvb, offset); | |||
| 1316 | break; | |||
| 1317 | ||||
| 1318 | default: | |||
| 1319 | if (length < 1) { | |||
| 1320 | value = 0; | |||
| 1321 | } else { | |||
| 1322 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset) | |||
| 1323 | : tvb_get_ntoh64(tvb, offset); | |||
| 1324 | } | |||
| 1325 | break; | |||
| 1326 | } | |||
| 1327 | return value; | |||
| 1328 | } | |||
| 1329 | ||||
| 1330 | int64_t | |||
| 1331 | tvb_get_int64(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1332 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1333 | return tvb_get_letohi64(tvb, offset); | |||
| 1334 | } else { | |||
| 1335 | return tvb_get_ntohi64(tvb, offset); | |||
| 1336 | } | |||
| 1337 | } | |||
| 1338 | ||||
| 1339 | float | |||
| 1340 | tvb_get_ieee_float(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1341 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1342 | return tvb_get_letohieee_float(tvb, offset); | |||
| 1343 | } else { | |||
| 1344 | return tvb_get_ntohieee_float(tvb, offset); | |||
| 1345 | } | |||
| 1346 | } | |||
| 1347 | ||||
| 1348 | double | |||
| 1349 | tvb_get_ieee_double(tvbuff_t *tvb, const int offset, const unsigned encoding) { | |||
| 1350 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 1351 | return tvb_get_letohieee_double(tvb, offset); | |||
| 1352 | } else { | |||
| 1353 | return tvb_get_ntohieee_double(tvb, offset); | |||
| 1354 | } | |||
| 1355 | } | |||
| 1356 | ||||
| 1357 | /* | |||
| 1358 | * Stuff for IEEE float handling on platforms that don't have IEEE | |||
| 1359 | * format as the native floating-point format. | |||
| 1360 | * | |||
| 1361 | * For now, we treat only the VAX as such a platform. | |||
| 1362 | * | |||
| 1363 | * XXX - other non-IEEE boxes that can run UN*X include some Crays, | |||
| 1364 | * and possibly other machines. However, I don't know whether there | |||
| 1365 | * are any other machines that could run Wireshark and that don't use | |||
| 1366 | * IEEE format. As far as I know, all of the main current and past | |||
| 1367 | * commercial microprocessor families on which OSes that support | |||
| 1368 | * Wireshark can run use IEEE format (x86, ARM, 68k, SPARC, MIPS, | |||
| 1369 | * PA-RISC, Alpha, IA-64, and so on), and it appears that the official | |||
| 1370 | * Linux port to System/390 and zArchitecture uses IEEE format floating- | |||
| 1371 | * point rather than IBM hex floating-point (not a huge surprise), so | |||
| 1372 | * I'm not sure that leaves any 32-bit or larger UN*X or Windows boxes, | |||
| 1373 | * other than VAXes, that don't use IEEE format. If you're not running | |||
| 1374 | * UN*X or Windows, the floating-point format is probably going to be | |||
| 1375 | * the least of your problems in a port. | |||
| 1376 | */ | |||
| 1377 | ||||
| 1378 | #if defined(vax) | |||
| 1379 | ||||
| 1380 | #include <math.h> | |||
| 1381 | ||||
| 1382 | /* | |||
| 1383 | * Single-precision. | |||
| 1384 | */ | |||
| 1385 | #define IEEE_SP_NUMBER_WIDTH 32 /* bits in number */ | |||
| 1386 | #define IEEE_SP_EXP_WIDTH 8 /* bits in exponent */ | |||
| 1387 | #define IEEE_SP_MANTISSA_WIDTH 23 /* IEEE_SP_NUMBER_WIDTH - 1 - IEEE_SP_EXP_WIDTH */ | |||
| 1388 | ||||
| 1389 | #define IEEE_SP_SIGN_MASK 0x80000000 | |||
| 1390 | #define IEEE_SP_EXPONENT_MASK 0x7F800000 | |||
| 1391 | #define IEEE_SP_MANTISSA_MASK 0x007FFFFF | |||
| 1392 | #define IEEE_SP_INFINITY IEEE_SP_EXPONENT_MASK | |||
| 1393 | ||||
| 1394 | #define IEEE_SP_IMPLIED_BIT (1 << IEEE_SP_MANTISSA_WIDTH) | |||
| 1395 | #define IEEE_SP_INFINITE ((1 << IEEE_SP_EXP_WIDTH) - 1) | |||
| 1396 | #define IEEE_SP_BIAS ((1 << (IEEE_SP_EXP_WIDTH - 1)) - 1) | |||
| 1397 | ||||
| 1398 | static int | |||
| 1399 | ieee_float_is_zero(const uint32_t w) | |||
| 1400 | { | |||
| 1401 | return ((w & ~IEEE_SP_SIGN_MASK) == 0); | |||
| 1402 | } | |||
| 1403 | ||||
| 1404 | static float | |||
| 1405 | get_ieee_float(const uint32_t w) | |||
| 1406 | { | |||
| 1407 | long sign; | |||
| 1408 | long exponent; | |||
| 1409 | long mantissa; | |||
| 1410 | ||||
| 1411 | sign = w & IEEE_SP_SIGN_MASK; | |||
| 1412 | exponent = w & IEEE_SP_EXPONENT_MASK; | |||
| 1413 | mantissa = w & IEEE_SP_MANTISSA_MASK; | |||
| 1414 | ||||
| 1415 | if (ieee_float_is_zero(w)) { | |||
| 1416 | /* number is zero, unnormalized, or not-a-number */ | |||
| 1417 | return 0.0; | |||
| 1418 | } | |||
| 1419 | #if 0 | |||
| 1420 | /* | |||
| 1421 | * XXX - how to handle this? | |||
| 1422 | */ | |||
| 1423 | if (IEEE_SP_INFINITY == exponent) { | |||
| 1424 | /* | |||
| 1425 | * number is positive or negative infinity, or a special value | |||
| 1426 | */ | |||
| 1427 | return (sign? MINUS_INFINITY: PLUS_INFINITY); | |||
| 1428 | } | |||
| 1429 | #endif | |||
| 1430 | ||||
| 1431 | exponent = ((exponent >> IEEE_SP_MANTISSA_WIDTH) - IEEE_SP_BIAS) - | |||
| 1432 | IEEE_SP_MANTISSA_WIDTH; | |||
| 1433 | mantissa |= IEEE_SP_IMPLIED_BIT; | |||
| 1434 | ||||
| 1435 | if (sign) | |||
| 1436 | return -mantissa * pow(2, exponent); | |||
| 1437 | else | |||
| 1438 | return mantissa * pow(2, exponent); | |||
| 1439 | } | |||
| 1440 | ||||
| 1441 | /* | |||
| 1442 | * Double-precision. | |||
| 1443 | * We assume that if you don't have IEEE floating-point, you have a | |||
| 1444 | * compiler that understands 64-bit integral quantities. | |||
| 1445 | */ | |||
| 1446 | #define IEEE_DP_NUMBER_WIDTH 64 /* bits in number */ | |||
| 1447 | #define IEEE_DP_EXP_WIDTH 11 /* bits in exponent */ | |||
| 1448 | #define IEEE_DP_MANTISSA_WIDTH 52 /* IEEE_DP_NUMBER_WIDTH - 1 - IEEE_DP_EXP_WIDTH */ | |||
| 1449 | ||||
| 1450 | #define IEEE_DP_SIGN_MASK INT64_C(0x8000000000000000)0x8000000000000000L | |||
| 1451 | #define IEEE_DP_EXPONENT_MASK INT64_C(0x7FF0000000000000)0x7FF0000000000000L | |||
| 1452 | #define IEEE_DP_MANTISSA_MASK INT64_C(0x000FFFFFFFFFFFFF)0x000FFFFFFFFFFFFFL | |||
| 1453 | #define IEEE_DP_INFINITY IEEE_DP_EXPONENT_MASK | |||
| 1454 | ||||
| 1455 | #define IEEE_DP_IMPLIED_BIT (INT64_C(1)1L << IEEE_DP_MANTISSA_WIDTH) | |||
| 1456 | #define IEEE_DP_INFINITE ((1 << IEEE_DP_EXP_WIDTH) - 1) | |||
| 1457 | #define IEEE_DP_BIAS ((1 << (IEEE_DP_EXP_WIDTH - 1)) - 1) | |||
| 1458 | ||||
| 1459 | static int | |||
| 1460 | ieee_double_is_zero(const uint64_t w) | |||
| 1461 | { | |||
| 1462 | return ((w & ~IEEE_SP_SIGN_MASK) == 0); | |||
| 1463 | } | |||
| 1464 | ||||
| 1465 | static double | |||
| 1466 | get_ieee_double(const uint64_t w) | |||
| 1467 | { | |||
| 1468 | int64_t sign; | |||
| 1469 | int64_t exponent; | |||
| 1470 | int64_t mantissa; | |||
| 1471 | ||||
| 1472 | sign = w & IEEE_DP_SIGN_MASK; | |||
| 1473 | exponent = w & IEEE_DP_EXPONENT_MASK; | |||
| 1474 | mantissa = w & IEEE_DP_MANTISSA_MASK; | |||
| 1475 | ||||
| 1476 | if (ieee_double_is_zero(w)) { | |||
| 1477 | /* number is zero, unnormalized, or not-a-number */ | |||
| 1478 | return 0.0; | |||
| 1479 | } | |||
| 1480 | #if 0 | |||
| 1481 | /* | |||
| 1482 | * XXX - how to handle this? | |||
| 1483 | */ | |||
| 1484 | if (IEEE_DP_INFINITY == exponent) { | |||
| 1485 | /* | |||
| 1486 | * number is positive or negative infinity, or a special value | |||
| 1487 | */ | |||
| 1488 | return (sign? MINUS_INFINITY: PLUS_INFINITY); | |||
| 1489 | } | |||
| 1490 | #endif | |||
| 1491 | ||||
| 1492 | exponent = ((exponent >> IEEE_DP_MANTISSA_WIDTH) - IEEE_DP_BIAS) - | |||
| 1493 | IEEE_DP_MANTISSA_WIDTH; | |||
| 1494 | mantissa |= IEEE_DP_IMPLIED_BIT; | |||
| 1495 | ||||
| 1496 | if (sign) | |||
| 1497 | return -mantissa * pow(2, exponent); | |||
| 1498 | else | |||
| 1499 | return mantissa * pow(2, exponent); | |||
| 1500 | } | |||
| 1501 | #endif | |||
| 1502 | ||||
| 1503 | /* | |||
| 1504 | * Fetches an IEEE single-precision floating-point number, in | |||
| 1505 | * big-endian form, and returns a "float". | |||
| 1506 | * | |||
| 1507 | * XXX - should this be "double", in case there are IEEE single- | |||
| 1508 | * precision numbers that won't fit in some platform's native | |||
| 1509 | * "float" format? | |||
| 1510 | */ | |||
| 1511 | float | |||
| 1512 | tvb_get_ntohieee_float(tvbuff_t *tvb, const int offset) | |||
| 1513 | { | |||
| 1514 | #if defined(vax) | |||
| 1515 | return get_ieee_float(tvb_get_ntohl(tvb, offset)); | |||
| 1516 | #else | |||
| 1517 | union { | |||
| 1518 | float f; | |||
| 1519 | uint32_t w; | |||
| 1520 | } ieee_fp_union; | |||
| 1521 | ||||
| 1522 | ieee_fp_union.w = tvb_get_ntohl(tvb, offset); | |||
| 1523 | return ieee_fp_union.f; | |||
| 1524 | #endif | |||
| 1525 | } | |||
| 1526 | ||||
| 1527 | /* | |||
| 1528 | * Fetches an IEEE double-precision floating-point number, in | |||
| 1529 | * big-endian form, and returns a "double". | |||
| 1530 | */ | |||
| 1531 | double | |||
| 1532 | tvb_get_ntohieee_double(tvbuff_t *tvb, const int offset) | |||
| 1533 | { | |||
| 1534 | #if defined(vax) | |||
| 1535 | union { | |||
| 1536 | uint32_t w[2]; | |||
| 1537 | uint64_t dw; | |||
| 1538 | } ieee_fp_union; | |||
| 1539 | #else | |||
| 1540 | union { | |||
| 1541 | double d; | |||
| 1542 | uint32_t w[2]; | |||
| 1543 | } ieee_fp_union; | |||
| 1544 | #endif | |||
| 1545 | ||||
| 1546 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321 | |||
| 1547 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset); | |||
| 1548 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset+4); | |||
| 1549 | #else | |||
| 1550 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset+4); | |||
| 1551 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset); | |||
| 1552 | #endif | |||
| 1553 | #if defined(vax) | |||
| 1554 | return get_ieee_double(ieee_fp_union.dw); | |||
| 1555 | #else | |||
| 1556 | return ieee_fp_union.d; | |||
| 1557 | #endif | |||
| 1558 | } | |||
| 1559 | ||||
| 1560 | uint16_t | |||
| 1561 | tvb_get_letohs(tvbuff_t *tvb, const int offset) | |||
| 1562 | { | |||
| 1563 | const uint8_t *ptr; | |||
| 1564 | ||||
| 1565 | ptr = fast_ensure_contiguous(tvb, offset, 2); | |||
| 1566 | return pletoh16(ptr); | |||
| 1567 | } | |||
| 1568 | ||||
| 1569 | int16_t | |||
| 1570 | tvb_get_letohis(tvbuff_t *tvb, const int offset) | |||
| 1571 | { | |||
| 1572 | const uint8_t *ptr; | |||
| 1573 | ||||
| 1574 | ptr = fast_ensure_contiguous(tvb, offset, 2); | |||
| 1575 | return pletoh16(ptr); | |||
| 1576 | } | |||
| 1577 | ||||
| 1578 | uint32_t | |||
| 1579 | tvb_get_letoh24(tvbuff_t *tvb, const int offset) | |||
| 1580 | { | |||
| 1581 | const uint8_t *ptr; | |||
| 1582 | ||||
| 1583 | ptr = fast_ensure_contiguous(tvb, offset, 3); | |||
| 1584 | return pletoh24(ptr); | |||
| 1585 | } | |||
| 1586 | ||||
| 1587 | int32_t | |||
| 1588 | tvb_get_letohi24(tvbuff_t *tvb, const int offset) | |||
| 1589 | { | |||
| 1590 | uint32_t ret; | |||
| 1591 | ||||
| 1592 | ret = ws_sign_ext32(tvb_get_letoh24(tvb, offset), 24); | |||
| 1593 | ||||
| 1594 | return (int32_t)ret; | |||
| 1595 | } | |||
| 1596 | ||||
| 1597 | uint32_t | |||
| 1598 | tvb_get_letohl(tvbuff_t *tvb, const int offset) | |||
| 1599 | { | |||
| 1600 | const uint8_t *ptr; | |||
| 1601 | ||||
| 1602 | ptr = fast_ensure_contiguous(tvb, offset, 4); | |||
| 1603 | return pletoh32(ptr); | |||
| 1604 | } | |||
| 1605 | ||||
| 1606 | int32_t | |||
| 1607 | tvb_get_letohil(tvbuff_t *tvb, const int offset) | |||
| 1608 | { | |||
| 1609 | const uint8_t *ptr; | |||
| 1610 | ||||
| 1611 | ptr = fast_ensure_contiguous(tvb, offset, 4); | |||
| 1612 | return pletoh32(ptr); | |||
| 1613 | } | |||
| 1614 | ||||
| 1615 | uint64_t | |||
| 1616 | tvb_get_letoh40(tvbuff_t *tvb, const int offset) | |||
| 1617 | { | |||
| 1618 | const uint8_t *ptr; | |||
| 1619 | ||||
| 1620 | ptr = fast_ensure_contiguous(tvb, offset, 5); | |||
| 1621 | return pletoh40(ptr); | |||
| 1622 | } | |||
| 1623 | ||||
| 1624 | int64_t | |||
| 1625 | tvb_get_letohi40(tvbuff_t *tvb, const int offset) | |||
| 1626 | { | |||
| 1627 | uint64_t ret; | |||
| 1628 | ||||
| 1629 | ret = ws_sign_ext64(tvb_get_letoh40(tvb, offset), 40); | |||
| 1630 | ||||
| 1631 | return (int64_t)ret; | |||
| 1632 | } | |||
| 1633 | ||||
| 1634 | uint64_t | |||
| 1635 | tvb_get_letoh48(tvbuff_t *tvb, const int offset) | |||
| 1636 | { | |||
| 1637 | const uint8_t *ptr; | |||
| 1638 | ||||
| 1639 | ptr = fast_ensure_contiguous(tvb, offset, 6); | |||
| 1640 | return pletoh48(ptr); | |||
| 1641 | } | |||
| 1642 | ||||
| 1643 | int64_t | |||
| 1644 | tvb_get_letohi48(tvbuff_t *tvb, const int offset) | |||
| 1645 | { | |||
| 1646 | uint64_t ret; | |||
| 1647 | ||||
| 1648 | ret = ws_sign_ext64(tvb_get_letoh48(tvb, offset), 48); | |||
| 1649 | ||||
| 1650 | return (int64_t)ret; | |||
| 1651 | } | |||
| 1652 | ||||
| 1653 | uint64_t | |||
| 1654 | tvb_get_letoh56(tvbuff_t *tvb, const int offset) | |||
| 1655 | { | |||
| 1656 | const uint8_t *ptr; | |||
| 1657 | ||||
| 1658 | ptr = fast_ensure_contiguous(tvb, offset, 7); | |||
| 1659 | return pletoh56(ptr); | |||
| 1660 | } | |||
| 1661 | ||||
| 1662 | int64_t | |||
| 1663 | tvb_get_letohi56(tvbuff_t *tvb, const int offset) | |||
| 1664 | { | |||
| 1665 | uint64_t ret; | |||
| 1666 | ||||
| 1667 | ret = ws_sign_ext64(tvb_get_letoh56(tvb, offset), 56); | |||
| 1668 | ||||
| 1669 | return (int64_t)ret; | |||
| 1670 | } | |||
| 1671 | ||||
| 1672 | uint64_t | |||
| 1673 | tvb_get_letoh64(tvbuff_t *tvb, const int offset) | |||
| 1674 | { | |||
| 1675 | const uint8_t *ptr; | |||
| 1676 | ||||
| 1677 | ptr = fast_ensure_contiguous(tvb, offset, 8); | |||
| 1678 | return pletoh64(ptr); | |||
| 1679 | } | |||
| 1680 | ||||
| 1681 | int64_t | |||
| 1682 | tvb_get_letohi64(tvbuff_t *tvb, const int offset) | |||
| 1683 | { | |||
| 1684 | const uint8_t *ptr; | |||
| 1685 | ||||
| 1686 | ptr = fast_ensure_contiguous(tvb, offset, 8); | |||
| 1687 | return pletoh64(ptr); | |||
| 1688 | } | |||
| 1689 | ||||
| 1690 | /* | |||
| 1691 | * Fetches an IEEE single-precision floating-point number, in | |||
| 1692 | * little-endian form, and returns a "float". | |||
| 1693 | * | |||
| 1694 | * XXX - should this be "double", in case there are IEEE single- | |||
| 1695 | * precision numbers that won't fit in some platform's native | |||
| 1696 | * "float" format? | |||
| 1697 | */ | |||
| 1698 | float | |||
| 1699 | tvb_get_letohieee_float(tvbuff_t *tvb, const int offset) | |||
| 1700 | { | |||
| 1701 | #if defined(vax) | |||
| 1702 | return get_ieee_float(tvb_get_letohl(tvb, offset)); | |||
| 1703 | #else | |||
| 1704 | union { | |||
| 1705 | float f; | |||
| 1706 | uint32_t w; | |||
| 1707 | } ieee_fp_union; | |||
| 1708 | ||||
| 1709 | ieee_fp_union.w = tvb_get_letohl(tvb, offset); | |||
| 1710 | return ieee_fp_union.f; | |||
| 1711 | #endif | |||
| 1712 | } | |||
| 1713 | ||||
| 1714 | /* | |||
| 1715 | * Fetches an IEEE double-precision floating-point number, in | |||
| 1716 | * little-endian form, and returns a "double". | |||
| 1717 | */ | |||
| 1718 | double | |||
| 1719 | tvb_get_letohieee_double(tvbuff_t *tvb, const int offset) | |||
| 1720 | { | |||
| 1721 | #if defined(vax) | |||
| 1722 | union { | |||
| 1723 | uint32_t w[2]; | |||
| 1724 | uint64_t dw; | |||
| 1725 | } ieee_fp_union; | |||
| 1726 | #else | |||
| 1727 | union { | |||
| 1728 | double d; | |||
| 1729 | uint32_t w[2]; | |||
| 1730 | } ieee_fp_union; | |||
| 1731 | #endif | |||
| 1732 | ||||
| 1733 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321 | |||
| 1734 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset+4); | |||
| 1735 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset); | |||
| 1736 | #else | |||
| 1737 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset); | |||
| 1738 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset+4); | |||
| 1739 | #endif | |||
| 1740 | #if defined(vax) | |||
| 1741 | return get_ieee_double(ieee_fp_union.dw); | |||
| 1742 | #else | |||
| 1743 | return ieee_fp_union.d; | |||
| 1744 | #endif | |||
| 1745 | } | |||
| 1746 | ||||
| 1747 | /* This function is a slight misnomer. It accepts all encodings that are | |||
| 1748 | * ASCII "enough", which means encodings that are the same as US-ASCII | |||
| 1749 | * for textual representations of dates and hex bytes; i.e., the same | |||
| 1750 | * for the hex digits and Z (in practice, all alphanumerics), and the | |||
| 1751 | * four separators ':' '-' '.' and ' ' | |||
| 1752 | * That means that any encoding that keeps the ISO/IEC 646 invariant | |||
| 1753 | * characters the same (including the T.61 8 bit encoding and multibyte | |||
| 1754 | * encodings like EUC-KR and GB18030) are OK, even if they replace characters | |||
| 1755 | * like '$' '#' and '\' with national variants, but not encodings like UTF-16 | |||
| 1756 | * that include extra null bytes. | |||
| 1757 | * For our current purposes, the unpacked GSM 7-bit default alphabet (but not | |||
| 1758 | * all National Language Shift Tables) also satisfies this requirement, but | |||
| 1759 | * note that it does *not* keep all ISO/IEC 646 invariant characters the same. | |||
| 1760 | * If this internal function gets used for additional purposes than currently, | |||
| 1761 | * the set of encodings that it accepts could change. | |||
| 1762 | * */ | |||
| 1763 | static inline void | |||
| 1764 | validate_single_byte_ascii_encoding(const unsigned encoding) | |||
| 1765 | { | |||
| 1766 | const unsigned enc = encoding & ~ENC_CHARENCODING_MASK0x0000FFFE; | |||
| 1767 | ||||
| 1768 | switch (enc) { | |||
| 1769 | case ENC_UTF_160x00000004: | |||
| 1770 | case ENC_UCS_20x00000006: | |||
| 1771 | case ENC_UCS_40x00000008: | |||
| 1772 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C: | |||
| 1773 | case ENC_ASCII_7BITS0x00000034: | |||
| 1774 | case ENC_EBCDIC0x0000002E: | |||
| 1775 | case ENC_EBCDIC_CP0370x00000038: | |||
| 1776 | case ENC_EBCDIC_CP5000x00000060: | |||
| 1777 | case ENC_BCD_DIGITS_0_90x00000044: | |||
| 1778 | case ENC_KEYPAD_ABC_TBCD0x00000046: | |||
| 1779 | case ENC_KEYPAD_BC_TBCD0x00000048: | |||
| 1780 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E: | |||
| 1781 | case ENC_APN_STR0x00000054: | |||
| 1782 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058: | |||
| 1783 | REPORT_DISSECTOR_BUG("Invalid string encoding type passed to tvb_get_string_XXX")proto_report_dissector_bug("Invalid string encoding type passed to tvb_get_string_XXX" ); | |||
| 1784 | break; | |||
| 1785 | default: | |||
| 1786 | break; | |||
| 1787 | } | |||
| 1788 | /* make sure something valid was set */ | |||
| 1789 | if (enc == 0) | |||
| 1790 | REPORT_DISSECTOR_BUG("No string encoding type passed to tvb_get_string_XXX")proto_report_dissector_bug("No string encoding type passed to tvb_get_string_XXX" ); | |||
| 1791 | } | |||
| 1792 | ||||
| 1793 | GByteArray* | |||
| 1794 | tvb_get_string_bytes(tvbuff_t *tvb, const int offset, const int length, | |||
| 1795 | const unsigned encoding, GByteArray *bytes, int *endoff) | |||
| 1796 | { | |||
| 1797 | char *ptr; | |||
| 1798 | const char *begin; | |||
| 1799 | const char *end = NULL((void*)0); | |||
| 1800 | GByteArray *retval = NULL((void*)0); | |||
| 1801 | ||||
| 1802 | validate_single_byte_ascii_encoding(encoding); | |||
| 1803 | ||||
| 1804 | ptr = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length); | |||
| 1805 | begin = ptr; | |||
| 1806 | ||||
| 1807 | if (endoff) *endoff = offset; | |||
| 1808 | ||||
| 1809 | while (*begin == ' ') begin++; | |||
| 1810 | ||||
| 1811 | if (*begin && bytes) { | |||
| 1812 | if (hex_str_to_bytes_encoding(begin, bytes, &end, encoding, false0)) { | |||
| 1813 | if (bytes->len > 0) { | |||
| 1814 | if (endoff) *endoff = offset + (int)(end - ptr); | |||
| 1815 | retval = bytes; | |||
| 1816 | } | |||
| 1817 | } | |||
| 1818 | } | |||
| 1819 | ||||
| 1820 | wmem_free(NULL((void*)0), ptr); | |||
| 1821 | ||||
| 1822 | return retval; | |||
| 1823 | } | |||
| 1824 | ||||
| 1825 | static bool_Bool | |||
| 1826 | parse_month_name(const char *name, int *tm_mon) | |||
| 1827 | { | |||
| 1828 | static const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May", | |||
| 1829 | "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; | |||
| 1830 | for (int i = 0; i < 12; i++) { | |||
| 1831 | if (memcmp(months[i], name, 4) == 0) { | |||
| 1832 | *tm_mon = i; | |||
| 1833 | return true1; | |||
| 1834 | } | |||
| 1835 | } | |||
| 1836 | return false0; | |||
| 1837 | } | |||
| 1838 | ||||
| 1839 | /* | |||
| 1840 | * Is the character a WSP character, as per RFC 5234? (space or tab). | |||
| 1841 | */ | |||
| 1842 | #define IS_WSP(c)((c) == ' ' || (c) == '\t') ((c) == ' ' || (c) == '\t') | |||
| 1843 | ||||
| 1844 | /* support hex-encoded time values? */ | |||
| 1845 | nstime_t* | |||
| 1846 | tvb_get_string_time(tvbuff_t *tvb, const int offset, const int length, | |||
| 1847 | const unsigned encoding, nstime_t *ns, int *endoff) | |||
| 1848 | { | |||
| 1849 | char *begin; | |||
| 1850 | const char *ptr; | |||
| 1851 | const char *end = NULL((void*)0); | |||
| 1852 | int num_chars = 0; | |||
| 1853 | int utc_offset = 0; | |||
| 1854 | ||||
| 1855 | validate_single_byte_ascii_encoding(encoding); | |||
| 1856 | ||||
| 1857 | DISSECTOR_ASSERT(ns)((void) ((ns) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 1857, "ns")))); | |||
| 1858 | ||||
| 1859 | begin = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length); | |||
| 1860 | ptr = begin; | |||
| 1861 | ||||
| 1862 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t')) | |||
| 1863 | ptr++; | |||
| 1864 | ||||
| 1865 | if (*ptr) { | |||
| 1866 | if ((encoding & ENC_ISO_8601_DATE_TIME0x00030000) == ENC_ISO_8601_DATE_TIME0x00030000) { | |||
| 1867 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME))) { | |||
| 1868 | ||||
| 1869 | ||||
| 1870 | goto fail; | |||
| 1871 | } | |||
| 1872 | } else if ((encoding & ENC_ISO_8601_DATE_TIME_BASIC0x00100000) == ENC_ISO_8601_DATE_TIME_BASIC0x00100000) { | |||
| 1873 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME_BASIC))) { | |||
| 1874 | ||||
| 1875 | ||||
| 1876 | goto fail; | |||
| 1877 | } | |||
| 1878 | } else { | |||
| 1879 | struct tm tm; | |||
| 1880 | ||||
| 1881 | memset(&tm, 0, sizeof(tm)); | |||
| 1882 | tm.tm_isdst = -1; | |||
| 1883 | ns->secs = 0; | |||
| 1884 | ns->nsecs = 0; | |||
| 1885 | ||||
| 1886 | /* note: sscanf is known to be inconsistent across platforms with respect | |||
| 1887 | to whether a %n is counted as a return value or not, so we have to use | |||
| 1888 | '>=' a lot */ | |||
| 1889 | if (encoding & ENC_ISO_8601_DATE0x00010000) { | |||
| 1890 | /* 2014-04-07 */ | |||
| 1891 | if (sscanf(ptr, "%d-%d-%d%n", | |||
| 1892 | &tm.tm_year, | |||
| 1893 | &tm.tm_mon, | |||
| 1894 | &tm.tm_mday, | |||
| 1895 | &num_chars) >= 3) | |||
| 1896 | { | |||
| 1897 | end = ptr + num_chars; | |||
| 1898 | tm.tm_mon--; | |||
| 1899 | if (tm.tm_year > 1900) tm.tm_year -= 1900; | |||
| 1900 | } else { | |||
| 1901 | goto fail; | |||
| 1902 | } | |||
| 1903 | } | |||
| 1904 | else if (encoding & ENC_ISO_8601_TIME0x00020000) { | |||
| 1905 | /* 2014-04-07 */ | |||
| 1906 | if (sscanf(ptr, "%d:%d:%d%n", | |||
| 1907 | &tm.tm_hour, | |||
| 1908 | &tm.tm_min, | |||
| 1909 | &tm.tm_sec, | |||
| 1910 | &num_chars) >= 2) | |||
| 1911 | { | |||
| 1912 | /* what should we do about day/month/year? */ | |||
| 1913 | /* setting it to "now" for now */ | |||
| 1914 | time_t time_now = time(NULL((void*)0)); | |||
| 1915 | struct tm *tm_now = gmtime(&time_now); | |||
| 1916 | if (tm_now != NULL((void*)0)) { | |||
| 1917 | tm.tm_year = tm_now->tm_year; | |||
| 1918 | tm.tm_mon = tm_now->tm_mon; | |||
| 1919 | tm.tm_mday = tm_now->tm_mday; | |||
| 1920 | } else { | |||
| 1921 | /* The second before the Epoch */ | |||
| 1922 | tm.tm_year = 69; | |||
| 1923 | tm.tm_mon = 12; | |||
| 1924 | tm.tm_mday = 31; | |||
| 1925 | } | |||
| 1926 | end = ptr + num_chars; | |||
| 1927 | } else { | |||
| 1928 | goto fail; | |||
| 1929 | } | |||
| 1930 | } | |||
| 1931 | else if (encoding & ENC_IMF_DATE_TIME0x00040000) { | |||
| 1932 | /* | |||
| 1933 | * Match [dow,] day month year hh:mm[:ss] with | |||
| 1934 | * two-digit years (RFC 822) or four-digit | |||
| 1935 | * years (RFCs 1123, 2822, 5822). Skip | |||
| 1936 | * the day of week since it is locale | |||
| 1937 | * dependent and does not affect the resulting | |||
| 1938 | * date anyway. | |||
| 1939 | */ | |||
| 1940 | if (g_ascii_isalpha(ptr[0])((g_ascii_table[(guchar) (ptr[0])] & G_ASCII_ALPHA) != 0) && g_ascii_isalpha(ptr[1])((g_ascii_table[(guchar) (ptr[1])] & G_ASCII_ALPHA) != 0) && g_ascii_isalpha(ptr[2])((g_ascii_table[(guchar) (ptr[2])] & G_ASCII_ALPHA) != 0) && ptr[3] == ',') | |||
| 1941 | ptr += 4; /* Skip day of week. */ | |||
| 1942 | ||||
| 1943 | /* | |||
| 1944 | * Parse the day-of-month and month | |||
| 1945 | * name. | |||
| 1946 | */ | |||
| 1947 | char month_name[4] = { 0 }; | |||
| 1948 | ||||
| 1949 | if (sscanf(ptr, "%d %3s%n", | |||
| 1950 | &tm.tm_mday, | |||
| 1951 | month_name, | |||
| 1952 | &num_chars) < 2) | |||
| 1953 | { | |||
| 1954 | /* Not matched. */ | |||
| 1955 | goto fail; | |||
| 1956 | } | |||
| 1957 | if (!parse_month_name(month_name, &tm.tm_mon)) { | |||
| 1958 | goto fail; | |||
| 1959 | } | |||
| 1960 | ptr += num_chars; | |||
| 1961 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t')) | |||
| 1962 | ptr++; | |||
| 1963 | ||||
| 1964 | /* | |||
| 1965 | * Scan the year. Treat 2-digit years | |||
| 1966 | * differently from 4-digit years. | |||
| 1967 | */ | |||
| 1968 | uint32_t year; | |||
| 1969 | const char *yearendp; | |||
| 1970 | ||||
| 1971 | if (!ws_strtou32(ptr, &yearendp, &year)) { | |||
| 1972 | goto fail; | |||
| 1973 | } | |||
| 1974 | if (!IS_WSP(*yearendp)((*yearendp) == ' ' || (*yearendp) == '\t')) { | |||
| 1975 | /* Not followed by WSP. */ | |||
| 1976 | goto fail; | |||
| 1977 | } | |||
| 1978 | if (yearendp - ptr < 2) { | |||
| 1979 | /* 1-digit year. Error. */ | |||
| 1980 | goto fail; | |||
| 1981 | } | |||
| 1982 | if (yearendp - ptr == 2) { | |||
| 1983 | /* | |||
| 1984 | * 2-digit year. | |||
| 1985 | * | |||
| 1986 | * Match RFC 2822/RFC 5322 behavior; | |||
| 1987 | * add 2000 to years from 0 to | |||
| 1988 | * 49 and 1900 to uears from 50 | |||
| 1989 | * to 99. | |||
| 1990 | */ | |||
| 1991 | if (year <= 49) { | |||
| 1992 | year += 2000; | |||
| 1993 | } else { | |||
| 1994 | year += 1900; | |||
| 1995 | } | |||
| 1996 | } else if (yearendp - ptr == 3) { | |||
| 1997 | /* | |||
| 1998 | * 3-digit year. | |||
| 1999 | * | |||
| 2000 | * Match RFC 2822/RFC 5322 behavior; | |||
| 2001 | * add 1900 to the year. | |||
| 2002 | */ | |||
| 2003 | year += 1900; | |||
| 2004 | } | |||
| 2005 | tm.tm_year = year - 1900; | |||
| 2006 | ptr = yearendp; | |||
| 2007 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t')) | |||
| 2008 | ptr++; | |||
| 2009 | ||||
| 2010 | /* Parse the time. */ | |||
| 2011 | if (sscanf(ptr, "%d:%d%n:%d%n", | |||
| 2012 | &tm.tm_hour, | |||
| 2013 | &tm.tm_min, | |||
| 2014 | &num_chars, | |||
| 2015 | &tm.tm_sec, | |||
| 2016 | &num_chars) < 2) | |||
| 2017 | { | |||
| 2018 | goto fail; | |||
| 2019 | } | |||
| 2020 | ptr += num_chars; | |||
| 2021 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t')) | |||
| 2022 | ptr++; | |||
| 2023 | ||||
| 2024 | /* | |||
| 2025 | * Parse the time zone. | |||
| 2026 | * Check for obs-zone values first. | |||
| 2027 | */ | |||
| 2028 | if (g_ascii_strncasecmp(ptr, "UT", 2) == 0) | |||
| 2029 | { | |||
| 2030 | ptr += 2; | |||
| 2031 | } | |||
| 2032 | else if (g_ascii_strncasecmp(ptr, "GMT", 3) == 0) | |||
| 2033 | { | |||
| 2034 | ptr += 3; | |||
| 2035 | } | |||
| 2036 | else | |||
| 2037 | { | |||
| 2038 | char sign; | |||
| 2039 | int off_hr; | |||
| 2040 | int off_min; | |||
| 2041 | ||||
| 2042 | if (sscanf(ptr, "%c%2d%2d%n", | |||
| 2043 | &sign, | |||
| 2044 | &off_hr, | |||
| 2045 | &off_min, | |||
| 2046 | &num_chars) < 3) | |||
| 2047 | { | |||
| 2048 | goto fail; | |||
| 2049 | } | |||
| 2050 | ||||
| 2051 | /* | |||
| 2052 | * If sign is '+', there's a positive | |||
| 2053 | * UTC offset. | |||
| 2054 | * | |||
| 2055 | * If sign is '-', there's a negative | |||
| 2056 | * UTC offset. | |||
| 2057 | * | |||
| 2058 | * Otherwise, that's an invalid UTC | |||
| 2059 | * offset string. | |||
| 2060 | */ | |||
| 2061 | if (sign == '+') | |||
| 2062 | utc_offset += (off_hr * 3600) + (off_min * 60); | |||
| 2063 | else if (sign == '-') | |||
| 2064 | utc_offset -= (off_hr * 3600) + (off_min * 60); | |||
| 2065 | else { | |||
| 2066 | /* Sign must be + or - */ | |||
| 2067 | goto fail; | |||
| 2068 | } | |||
| 2069 | ptr += num_chars; | |||
| 2070 | } | |||
| 2071 | end = ptr; | |||
| 2072 | } | |||
| 2073 | ns->secs = mktime_utc(&tm); | |||
| 2074 | if (ns->secs == (time_t)-1 && errno(*__errno_location ()) != 0) { | |||
| 2075 | goto fail; | |||
| 2076 | } | |||
| 2077 | ns->secs += utc_offset; | |||
| 2078 | } | |||
| 2079 | } else { | |||
| 2080 | /* Empty string */ | |||
| 2081 | goto fail; | |||
| 2082 | } | |||
| 2083 | ||||
| 2084 | if (endoff) | |||
| 2085 | *endoff = (int)(offset + (end - begin)); | |||
| 2086 | wmem_free(NULL((void*)0), begin); | |||
| 2087 | return ns; | |||
| 2088 | ||||
| 2089 | fail: | |||
| 2090 | wmem_free(NULL((void*)0), begin); | |||
| 2091 | return NULL((void*)0); | |||
| 2092 | } | |||
| 2093 | ||||
| 2094 | /* Fetch an IPv4 address, in network byte order. | |||
| 2095 | * We do *not* convert them to host byte order; we leave them in | |||
| 2096 | * network byte order. */ | |||
| 2097 | uint32_t | |||
| 2098 | tvb_get_ipv4(tvbuff_t *tvb, const int offset) | |||
| 2099 | { | |||
| 2100 | const uint8_t *ptr; | |||
| 2101 | uint32_t addr; | |||
| 2102 | ||||
| 2103 | ptr = fast_ensure_contiguous(tvb, offset, sizeof(uint32_t)); | |||
| 2104 | memcpy(&addr, ptr, sizeof addr); | |||
| 2105 | return addr; | |||
| 2106 | } | |||
| 2107 | ||||
| 2108 | /* Fetch an IPv6 address. */ | |||
| 2109 | void | |||
| 2110 | tvb_get_ipv6(tvbuff_t *tvb, const int offset, ws_in6_addr *addr) | |||
| 2111 | { | |||
| 2112 | const uint8_t *ptr; | |||
| 2113 | ||||
| 2114 | ptr = ensure_contiguous(tvb, offset, sizeof(*addr)); | |||
| 2115 | memcpy(addr, ptr, sizeof *addr); | |||
| 2116 | } | |||
| 2117 | ||||
| 2118 | /* | |||
| 2119 | * These routines return the length of the address in bytes on success | |||
| 2120 | * and -1 if the prefix length is too long. | |||
| 2121 | */ | |||
| 2122 | int | |||
| 2123 | tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in4_addr *addr, | |||
| 2124 | uint32_t prefix_len) | |||
| 2125 | { | |||
| 2126 | uint8_t addr_len; | |||
| 2127 | ||||
| 2128 | if (prefix_len > 32) | |||
| 2129 | return -1; | |||
| 2130 | ||||
| 2131 | addr_len = (prefix_len + 7) / 8; | |||
| 2132 | *addr = 0; | |||
| 2133 | tvb_memcpy(tvb, addr, offset, addr_len); | |||
| 2134 | if (prefix_len % 8) | |||
| 2135 | ((uint8_t*)addr)[addr_len - 1] &= ((0xff00 >> (prefix_len % 8)) & 0xff); | |||
| 2136 | return addr_len; | |||
| 2137 | } | |||
| 2138 | ||||
| 2139 | /* | |||
| 2140 | * These routines return the length of the address in bytes on success | |||
| 2141 | * and -1 if the prefix length is too long. | |||
| 2142 | */ | |||
| 2143 | int | |||
| 2144 | tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in6_addr *addr, | |||
| 2145 | uint32_t prefix_len) | |||
| 2146 | { | |||
| 2147 | uint32_t addr_len; | |||
| 2148 | ||||
| 2149 | if (prefix_len > 128) | |||
| 2150 | return -1; | |||
| 2151 | ||||
| 2152 | addr_len = (prefix_len + 7) / 8; | |||
| 2153 | memset(addr->bytes, 0, 16); | |||
| 2154 | tvb_memcpy(tvb, addr->bytes, offset, addr_len); | |||
| 2155 | if (prefix_len % 8) { | |||
| 2156 | addr->bytes[addr_len - 1] &= | |||
| 2157 | ((0xff00 >> (prefix_len % 8)) & 0xff); | |||
| 2158 | } | |||
| 2159 | ||||
| 2160 | return addr_len; | |||
| 2161 | } | |||
| 2162 | ||||
| 2163 | /* Fetch a GUID. */ | |||
| 2164 | void | |||
| 2165 | tvb_get_ntohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid) | |||
| 2166 | { | |||
| 2167 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16); | |||
| 2168 | ||||
| 2169 | guid->data1 = pntoh32(ptr + 0); | |||
| 2170 | guid->data2 = pntoh16(ptr + 4); | |||
| 2171 | guid->data3 = pntoh16(ptr + 6); | |||
| 2172 | memcpy(guid->data4, ptr + 8, sizeof guid->data4); | |||
| 2173 | } | |||
| 2174 | ||||
| 2175 | void | |||
| 2176 | tvb_get_letohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid) | |||
| 2177 | { | |||
| 2178 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16); | |||
| 2179 | ||||
| 2180 | guid->data1 = pletoh32(ptr + 0); | |||
| 2181 | guid->data2 = pletoh16(ptr + 4); | |||
| 2182 | guid->data3 = pletoh16(ptr + 6); | |||
| 2183 | memcpy(guid->data4, ptr + 8, sizeof guid->data4); | |||
| 2184 | } | |||
| 2185 | ||||
| 2186 | void | |||
| 2187 | tvb_get_guid(tvbuff_t *tvb, const int offset, e_guid_t *guid, const unsigned encoding) | |||
| 2188 | { | |||
| 2189 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 2190 | tvb_get_letohguid(tvb, offset, guid); | |||
| 2191 | } else { | |||
| 2192 | tvb_get_ntohguid(tvb, offset, guid); | |||
| 2193 | } | |||
| 2194 | } | |||
| 2195 | ||||
| 2196 | static const uint8_t bit_mask8[] = { | |||
| 2197 | 0x00, | |||
| 2198 | 0x01, | |||
| 2199 | 0x03, | |||
| 2200 | 0x07, | |||
| 2201 | 0x0f, | |||
| 2202 | 0x1f, | |||
| 2203 | 0x3f, | |||
| 2204 | 0x7f, | |||
| 2205 | 0xff | |||
| 2206 | }; | |||
| 2207 | ||||
| 2208 | ||||
| 2209 | /* Get a variable amount of bits | |||
| 2210 | * | |||
| 2211 | * Return a byte array with bit limited data. | |||
| 2212 | * When encoding is ENC_BIG_ENDIAN, the data is aligned to the left. | |||
| 2213 | * When encoding is ENC_LITTLE_ENDIAN, the data is aligned to the right. | |||
| 2214 | */ | |||
| 2215 | uint8_t * | |||
| 2216 | tvb_get_bits_array(wmem_allocator_t *scope, tvbuff_t *tvb, const int bit_offset, | |||
| 2217 | size_t no_of_bits, size_t *data_length, const unsigned encoding) | |||
| 2218 | { | |||
| 2219 | tvbuff_t *sub_tvb; | |||
| 2220 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| ||||
| 2221 | sub_tvb = tvb_new_octet_right_aligned(tvb, bit_offset, (int32_t) no_of_bits); | |||
| 2222 | } else { | |||
| 2223 | sub_tvb = tvb_new_octet_aligned(tvb, bit_offset, (int32_t) no_of_bits); | |||
| 2224 | } | |||
| 2225 | *data_length = tvb_reported_length(sub_tvb); | |||
| 2226 | return (uint8_t*)tvb_memdup(scope, sub_tvb, 0, *data_length); | |||
| 2227 | } | |||
| 2228 | ||||
| 2229 | /* Get 1 - 8 bits */ | |||
| 2230 | uint8_t | |||
| 2231 | tvb_get_bits8(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits) | |||
| 2232 | { | |||
| 2233 | DISSECTOR_ASSERT_HINT(no_of_bits <= 8, "Too many bits requested for 8-bit return type")((void) ((no_of_bits <= 8) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2233 , "no_of_bits <= 8", "Too many bits requested for 8-bit return type" )))); | |||
| 2234 | return (uint8_t)_tvb_get_bits64(tvb, bit_offset, no_of_bits); | |||
| 2235 | } | |||
| 2236 | ||||
| 2237 | /* Get 1 - 16 bits */ | |||
| 2238 | uint16_t | |||
| 2239 | tvb_get_bits16(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding) | |||
| 2240 | { | |||
| 2241 | DISSECTOR_ASSERT_HINT(no_of_bits <= 16, "Too many bits requested for 16-bit return type")((void) ((no_of_bits <= 16) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2241 , "no_of_bits <= 16", "Too many bits requested for 16-bit return type" )))); | |||
| 2242 | return (uint16_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding); | |||
| 2243 | } | |||
| 2244 | ||||
| 2245 | /* Get 1 - 32 bits */ | |||
| 2246 | uint32_t | |||
| 2247 | tvb_get_bits32(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding) | |||
| 2248 | { | |||
| 2249 | DISSECTOR_ASSERT_HINT(no_of_bits <= 32, "Too many bits requested for 32-bit return type")((void) ((no_of_bits <= 32) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2249 , "no_of_bits <= 32", "Too many bits requested for 32-bit return type" )))); | |||
| 2250 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding); | |||
| 2251 | } | |||
| 2252 | ||||
| 2253 | /* Get 1 - 64 bits */ | |||
| 2254 | uint64_t | |||
| 2255 | tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding) | |||
| 2256 | { | |||
| 2257 | DISSECTOR_ASSERT_HINT(no_of_bits <= 64, "Too many bits requested for 64-bit return type")((void) ((no_of_bits <= 64) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2257 , "no_of_bits <= 64", "Too many bits requested for 64-bit return type" )))); | |||
| 2258 | ||||
| 2259 | /* encoding determines bit numbering within octet array */ | |||
| 2260 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) { | |||
| 2261 | return _tvb_get_bits64_le(tvb, bit_offset, no_of_bits); | |||
| 2262 | } else { | |||
| 2263 | return _tvb_get_bits64(tvb, bit_offset, no_of_bits); | |||
| 2264 | } | |||
| 2265 | } | |||
| 2266 | ||||
| 2267 | /* | |||
| 2268 | * This function will dissect a sequence of bits that does not need to be byte aligned; the bits | |||
| 2269 | * set will be shown in the tree as ..10 10.. and the integer value returned if return_value is set. | |||
| 2270 | * Offset should be given in bits from the start of the tvb. | |||
| 2271 | * Bits within octet are numbered from MSB (0) to LSB (7). Bit at bit_offset is return value most significant bit. | |||
| 2272 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits. | |||
| 2273 | */ | |||
| 2274 | static uint64_t | |||
| 2275 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits) | |||
| 2276 | { | |||
| 2277 | uint64_t value; | |||
| 2278 | unsigned octet_offset = bit_offset >> 3; | |||
| 2279 | uint8_t required_bits_in_first_octet = 8 - (bit_offset % 8); | |||
| 2280 | ||||
| 2281 | if(required_bits_in_first_octet > total_no_of_bits) | |||
| 2282 | { | |||
| 2283 | /* the required bits don't extend to the end of the first octet */ | |||
| 2284 | uint8_t right_shift = required_bits_in_first_octet - total_no_of_bits; | |||
| 2285 | value = (tvb_get_uint8(tvb, octet_offset) >> right_shift) & bit_mask8[total_no_of_bits % 8]; | |||
| 2286 | } | |||
| 2287 | else | |||
| 2288 | { | |||
| 2289 | uint8_t remaining_bit_length = total_no_of_bits; | |||
| 2290 | ||||
| 2291 | /* get the bits up to the first octet boundary */ | |||
| 2292 | value = 0; | |||
| 2293 | required_bits_in_first_octet %= 8; | |||
| 2294 | if(required_bits_in_first_octet != 0) | |||
| 2295 | { | |||
| 2296 | value = tvb_get_uint8(tvb, octet_offset) & bit_mask8[required_bits_in_first_octet]; | |||
| 2297 | remaining_bit_length -= required_bits_in_first_octet; | |||
| 2298 | octet_offset ++; | |||
| 2299 | } | |||
| 2300 | /* take the biggest words, shorts or octets that we can */ | |||
| 2301 | while (remaining_bit_length > 7) | |||
| 2302 | { | |||
| 2303 | switch (remaining_bit_length >> 4) | |||
| 2304 | { | |||
| 2305 | case 0: | |||
| 2306 | /* 8 - 15 bits. (note that 0 - 7 would have dropped out of the while() loop) */ | |||
| 2307 | value <<= 8; | |||
| 2308 | value += tvb_get_uint8(tvb, octet_offset); | |||
| 2309 | remaining_bit_length -= 8; | |||
| 2310 | octet_offset ++; | |||
| 2311 | break; | |||
| 2312 | ||||
| 2313 | case 1: | |||
| 2314 | /* 16 - 31 bits */ | |||
| 2315 | value <<= 16; | |||
| 2316 | value += tvb_get_ntohs(tvb, octet_offset); | |||
| 2317 | remaining_bit_length -= 16; | |||
| 2318 | octet_offset += 2; | |||
| 2319 | break; | |||
| 2320 | ||||
| 2321 | case 2: | |||
| 2322 | case 3: | |||
| 2323 | /* 32 - 63 bits */ | |||
| 2324 | value <<= 32; | |||
| 2325 | value += tvb_get_ntohl(tvb, octet_offset); | |||
| 2326 | remaining_bit_length -= 32; | |||
| 2327 | octet_offset += 4; | |||
| 2328 | break; | |||
| 2329 | ||||
| 2330 | default: | |||
| 2331 | /* 64 bits (or more???) */ | |||
| 2332 | value = tvb_get_ntoh64(tvb, octet_offset); | |||
| 2333 | remaining_bit_length -= 64; | |||
| 2334 | octet_offset += 8; | |||
| 2335 | break; | |||
| 2336 | } | |||
| 2337 | } | |||
| 2338 | /* get bits from any partial octet at the tail */ | |||
| 2339 | if(remaining_bit_length) | |||
| 2340 | { | |||
| 2341 | value <<= remaining_bit_length; | |||
| 2342 | value += (tvb_get_uint8(tvb, octet_offset) >> (8 - remaining_bit_length)); | |||
| 2343 | } | |||
| 2344 | } | |||
| 2345 | return value; | |||
| 2346 | } | |||
| 2347 | ||||
| 2348 | /* | |||
| 2349 | * Offset should be given in bits from the start of the tvb. | |||
| 2350 | * Bits within octet are numbered from LSB (0) to MSB (7). Bit at bit_offset is return value least significant bit. | |||
| 2351 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits. | |||
| 2352 | */ | |||
| 2353 | static uint64_t | |||
| 2354 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits) | |||
| 2355 | { | |||
| 2356 | uint64_t value = 0; | |||
| 2357 | unsigned octet_offset = bit_offset / 8; | |||
| 2358 | int remaining_bits = total_no_of_bits; | |||
| 2359 | int shift = 0; | |||
| 2360 | ||||
| 2361 | if (remaining_bits > 64) | |||
| 2362 | { | |||
| 2363 | remaining_bits = 64; | |||
| 2364 | } | |||
| 2365 | ||||
| 2366 | if (bit_offset % 8) | |||
| 2367 | { | |||
| 2368 | /* not aligned, extract bits from first octet */ | |||
| 2369 | shift = 8 - (bit_offset % 8); | |||
| 2370 | value = tvb_get_uint8(tvb, octet_offset) >> (bit_offset % 8); | |||
| 2371 | if (shift > remaining_bits) | |||
| 2372 | { | |||
| 2373 | /* keep only the requested bits */ | |||
| 2374 | value &= (UINT64_C(1)1UL << remaining_bits) - 1; | |||
| 2375 | remaining_bits = 0; | |||
| 2376 | } | |||
| 2377 | else | |||
| 2378 | { | |||
| 2379 | remaining_bits -= shift; | |||
| 2380 | } | |||
| 2381 | octet_offset++; | |||
| 2382 | } | |||
| 2383 | ||||
| 2384 | while (remaining_bits > 0) | |||
| 2385 | { | |||
| 2386 | /* take the biggest words, shorts or octets that we can */ | |||
| 2387 | if (remaining_bits >= 32) | |||
| 2388 | { | |||
| 2389 | value |= ((uint64_t)tvb_get_letohl(tvb, octet_offset) << shift); | |||
| 2390 | shift += 32; | |||
| 2391 | remaining_bits -= 32; | |||
| 2392 | octet_offset += 4; | |||
| 2393 | } | |||
| 2394 | else if (remaining_bits >= 16) | |||
| 2395 | { | |||
| 2396 | value |= ((uint64_t)tvb_get_letohs(tvb, octet_offset) << shift); | |||
| 2397 | shift += 16; | |||
| 2398 | remaining_bits -= 16; | |||
| 2399 | octet_offset += 2; | |||
| 2400 | } | |||
| 2401 | else if (remaining_bits >= 8) | |||
| 2402 | { | |||
| 2403 | value |= ((uint64_t)tvb_get_uint8(tvb, octet_offset) << shift); | |||
| 2404 | shift += 8; | |||
| 2405 | remaining_bits -= 8; | |||
| 2406 | octet_offset += 1; | |||
| 2407 | } | |||
| 2408 | else | |||
| 2409 | { | |||
| 2410 | unsigned mask = (1 << remaining_bits) - 1; | |||
| 2411 | value |= (((uint64_t)tvb_get_uint8(tvb, octet_offset) & mask) << shift); | |||
| 2412 | shift += remaining_bits; | |||
| 2413 | remaining_bits = 0; | |||
| 2414 | octet_offset += 1; | |||
| 2415 | } | |||
| 2416 | } | |||
| 2417 | return value; | |||
| 2418 | } | |||
| 2419 | ||||
| 2420 | /* Get 1 - 32 bits (should be deprecated as same as tvb_get_bits32??) */ | |||
| 2421 | uint32_t | |||
| 2422 | tvb_get_bits(tvbuff_t *tvb, const unsigned bit_offset, const int no_of_bits, const unsigned encoding) | |||
| 2423 | { | |||
| 2424 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding); | |||
| 2425 | } | |||
| 2426 | ||||
| 2427 | static int | |||
| 2428 | tvb_find_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, uint8_t needle) | |||
| 2429 | { | |||
| 2430 | const uint8_t *ptr; | |||
| 2431 | const uint8_t *result; | |||
| 2432 | ||||
| 2433 | ptr = ensure_contiguous(tvb, abs_offset, limit); /* tvb_get_ptr() */ | |||
| 2434 | if (!ptr) | |||
| 2435 | return -1; | |||
| 2436 | ||||
| 2437 | result = (const uint8_t *) memchr(ptr, needle, limit); | |||
| 2438 | if (!result) | |||
| 2439 | return -1; | |||
| 2440 | ||||
| 2441 | return (int) ((result - ptr) + abs_offset); | |||
| 2442 | } | |||
| 2443 | ||||
| 2444 | /* Find first occurrence of needle in tvbuff, starting at offset. Searches | |||
| 2445 | * at most maxlength number of bytes; if maxlength is -1, searches to | |||
| 2446 | * end of tvbuff. | |||
| 2447 | * Returns the offset of the found needle, or -1 if not found. | |||
| 2448 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff; | |||
| 2449 | * in that case, -1 will be returned if the boundary is reached before | |||
| 2450 | * finding needle. */ | |||
| 2451 | int | |||
| 2452 | tvb_find_uint8(tvbuff_t *tvb, const int offset, const int maxlength, const uint8_t needle) | |||
| 2453 | { | |||
| 2454 | const uint8_t *result; | |||
| 2455 | unsigned abs_offset = 0; | |||
| 2456 | unsigned limit = 0; | |||
| 2457 | int exception; | |||
| 2458 | ||||
| 2459 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2459, "tvb && tvb->initialized" )))); | |||
| 2460 | ||||
| 2461 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit); | |||
| 2462 | if (exception) | |||
| 2463 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 2464 | ||||
| 2465 | /* Only search to end of tvbuff, w/o throwing exception. */ | |||
| 2466 | if (maxlength >= 0 && limit > (unsigned) maxlength) { | |||
| 2467 | /* Maximum length doesn't go past end of tvbuff; search | |||
| 2468 | to that value. */ | |||
| 2469 | limit = (unsigned) maxlength; | |||
| 2470 | } | |||
| 2471 | ||||
| 2472 | /* If we have real data, perform our search now. */ | |||
| 2473 | if (tvb->real_data) { | |||
| 2474 | result = (const uint8_t *)memchr(tvb->real_data + abs_offset, needle, limit); | |||
| 2475 | if (result == NULL((void*)0)) { | |||
| 2476 | return -1; | |||
| 2477 | } | |||
| 2478 | else { | |||
| 2479 | return (int) (result - tvb->real_data); | |||
| 2480 | } | |||
| 2481 | } | |||
| 2482 | ||||
| 2483 | if (tvb->ops->tvb_find_uint8) | |||
| 2484 | return tvb->ops->tvb_find_uint8(tvb, abs_offset, limit, needle); | |||
| 2485 | ||||
| 2486 | return tvb_find_uint8_generic(tvb, offset, limit, needle); | |||
| 2487 | } | |||
| 2488 | ||||
| 2489 | /* Same as tvb_find_uint8() with 16bit needle. */ | |||
| 2490 | int | |||
| 2491 | tvb_find_uint16(tvbuff_t *tvb, const int offset, const int maxlength, | |||
| 2492 | const uint16_t needle) | |||
| 2493 | { | |||
| 2494 | unsigned abs_offset = 0; | |||
| 2495 | unsigned limit = 0; | |||
| 2496 | int exception; | |||
| 2497 | ||||
| 2498 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit); | |||
| 2499 | if (exception) | |||
| 2500 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 2501 | ||||
| 2502 | /* Only search to end of tvbuff, w/o throwing exception. */ | |||
| 2503 | if (maxlength >= 0 && limit > (unsigned) maxlength) { | |||
| 2504 | /* Maximum length doesn't go past end of tvbuff; search | |||
| 2505 | to that value. */ | |||
| 2506 | limit = (unsigned) maxlength; | |||
| 2507 | } | |||
| 2508 | ||||
| 2509 | const uint8_t needle1 = ((needle & 0xFF00) >> 8); | |||
| 2510 | const uint8_t needle2 = ((needle & 0x00FF) >> 0); | |||
| 2511 | unsigned searched_bytes = 0; | |||
| 2512 | unsigned pos = abs_offset; | |||
| 2513 | ||||
| 2514 | do { | |||
| 2515 | int offset1 = | |||
| 2516 | tvb_find_uint8(tvb, pos, limit - searched_bytes, needle1); | |||
| 2517 | int offset2 = -1; | |||
| 2518 | ||||
| 2519 | if (offset1 == -1) { | |||
| 2520 | return -1; | |||
| 2521 | } | |||
| 2522 | ||||
| 2523 | searched_bytes = (unsigned)offset1 - abs_offset + 1; | |||
| 2524 | ||||
| 2525 | if (searched_bytes >= limit) { | |||
| 2526 | return -1; | |||
| 2527 | } | |||
| 2528 | ||||
| 2529 | offset2 = tvb_find_uint8(tvb, offset1 + 1, 1, needle2); | |||
| 2530 | ||||
| 2531 | searched_bytes += 1; | |||
| 2532 | ||||
| 2533 | if (offset2 != -1) { | |||
| 2534 | if (searched_bytes > limit) { | |||
| 2535 | return -1; | |||
| 2536 | } | |||
| 2537 | return offset1; | |||
| 2538 | } | |||
| 2539 | ||||
| 2540 | pos = offset1 + 1; | |||
| 2541 | } while (searched_bytes < limit); | |||
| 2542 | ||||
| 2543 | return -1; | |||
| 2544 | } | |||
| 2545 | ||||
| 2546 | static inline int | |||
| 2547 | tvb_ws_mempbrk_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, const ws_mempbrk_pattern* pattern, unsigned char *found_needle) | |||
| 2548 | { | |||
| 2549 | const uint8_t *ptr; | |||
| 2550 | const uint8_t *result; | |||
| 2551 | ||||
| 2552 | ptr = ensure_contiguous(tvb, abs_offset, limit); /* tvb_get_ptr */ | |||
| 2553 | if (!ptr) | |||
| 2554 | return -1; | |||
| 2555 | ||||
| 2556 | result = ws_mempbrk_exec(ptr, limit, pattern, found_needle); | |||
| 2557 | if (!result) | |||
| 2558 | return -1; | |||
| 2559 | ||||
| 2560 | return (int) ((result - ptr) + abs_offset); | |||
| 2561 | } | |||
| 2562 | ||||
| 2563 | ||||
| 2564 | /* Find first occurrence of any of the pattern chars in tvbuff, starting at offset. | |||
| 2565 | * Searches at most maxlength number of bytes; if maxlength is -1, searches | |||
| 2566 | * to end of tvbuff. | |||
| 2567 | * Returns the offset of the found needle, or -1 if not found. | |||
| 2568 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff; | |||
| 2569 | * in that case, -1 will be returned if the boundary is reached before | |||
| 2570 | * finding needle. */ | |||
| 2571 | int | |||
| 2572 | tvb_ws_mempbrk_pattern_uint8(tvbuff_t *tvb, const int offset, const int maxlength, | |||
| 2573 | const ws_mempbrk_pattern* pattern, unsigned char *found_needle) | |||
| 2574 | { | |||
| 2575 | const uint8_t *result; | |||
| 2576 | unsigned abs_offset = 0; | |||
| 2577 | unsigned limit = 0; | |||
| 2578 | int exception; | |||
| 2579 | ||||
| 2580 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2580, "tvb && tvb->initialized" )))); | |||
| 2581 | ||||
| 2582 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit); | |||
| 2583 | if (exception) | |||
| 2584 | THROW(exception)except_throw(1, (exception), ((void*)0)); | |||
| 2585 | ||||
| 2586 | /* Only search to end of tvbuff, w/o throwing exception. */ | |||
| 2587 | if (limit > (unsigned) maxlength) { | |||
| 2588 | /* Maximum length doesn't go past end of tvbuff; search | |||
| 2589 | to that value. */ | |||
| 2590 | limit = maxlength; | |||
| 2591 | } | |||
| 2592 | ||||
| 2593 | /* If we have real data, perform our search now. */ | |||
| 2594 | if (tvb->real_data) { | |||
| 2595 | result = ws_mempbrk_exec(tvb->real_data + abs_offset, limit, pattern, found_needle); | |||
| 2596 | if (result == NULL((void*)0)) { | |||
| 2597 | return -1; | |||
| 2598 | } | |||
| 2599 | else { | |||
| 2600 | return (int) (result - tvb->real_data); | |||
| 2601 | } | |||
| 2602 | } | |||
| 2603 | ||||
| 2604 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8) | |||
| 2605 | return tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, abs_offset, limit, pattern, found_needle); | |||
| 2606 | ||||
| 2607 | return tvb_ws_mempbrk_uint8_generic(tvb, abs_offset, limit, pattern, found_needle); | |||
| 2608 | } | |||
| 2609 | ||||
| 2610 | /* Find size of stringz (NUL-terminated string) by looking for terminating | |||
| 2611 | * NUL. The size of the string includes the terminating NUL. | |||
| 2612 | * | |||
| 2613 | * If the NUL isn't found, it throws the appropriate exception. | |||
| 2614 | */ | |||
| 2615 | unsigned | |||
| 2616 | tvb_strsize(tvbuff_t *tvb, const int offset) | |||
| 2617 | { | |||
| 2618 | unsigned abs_offset = 0, junk_length; | |||
| 2619 | int nul_offset; | |||
| 2620 | ||||
| 2621 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2621, "tvb && tvb->initialized" )))); | |||
| 2622 | ||||
| 2623 | check_offset_length(tvb, offset, 0, &abs_offset, &junk_length); | |||
| 2624 | nul_offset = tvb_find_uint8(tvb, abs_offset, -1, 0); | |||
| 2625 | if (nul_offset == -1) { | |||
| 2626 | /* | |||
| 2627 | * OK, we hit the end of the tvbuff, so we should throw | |||
| 2628 | * an exception. | |||
| 2629 | */ | |||
| 2630 | if (tvb->length < tvb->contained_length) { | |||
| 2631 | THROW(BoundsError)except_throw(1, (1), ((void*)0)); | |||
| 2632 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) { | |||
| 2633 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0)); | |||
| 2634 | } else if (tvb->length < tvb->reported_length) { | |||
| 2635 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0)); | |||
| 2636 | } else { | |||
| 2637 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 2638 | } | |||
| 2639 | } | |||
| 2640 | return (nul_offset - abs_offset) + 1; | |||
| 2641 | } | |||
| 2642 | ||||
| 2643 | /* UTF-16/UCS-2 version of tvb_strsize */ | |||
| 2644 | /* Returns number of bytes including the (two-bytes) null terminator */ | |||
| 2645 | unsigned | |||
| 2646 | tvb_unicode_strsize(tvbuff_t *tvb, const int offset) | |||
| 2647 | { | |||
| 2648 | unsigned i = 0; | |||
| 2649 | gunichar2 uchar; | |||
| 2650 | ||||
| 2651 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2651, "tvb && tvb->initialized" )))); | |||
| 2652 | ||||
| 2653 | do { | |||
| 2654 | /* Endianness doesn't matter when looking for null */ | |||
| 2655 | uchar = tvb_get_ntohs(tvb, offset + i); | |||
| 2656 | i += 2; | |||
| 2657 | } while(uchar != 0); | |||
| 2658 | ||||
| 2659 | return i; | |||
| 2660 | } | |||
| 2661 | ||||
| 2662 | /* Find length of string by looking for end of string ('\0'), up to | |||
| 2663 | * 'maxlength' characters'; if 'maxlength' is -1, searches to end | |||
| 2664 | * of tvbuff. | |||
| 2665 | * Returns -1 if 'maxlength' reached before finding EOS. */ | |||
| 2666 | int | |||
| 2667 | tvb_strnlen(tvbuff_t *tvb, const int offset, const unsigned maxlength) | |||
| 2668 | { | |||
| 2669 | int result_offset; | |||
| 2670 | unsigned abs_offset = 0, junk_length; | |||
| 2671 | ||||
| 2672 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2672, "tvb && tvb->initialized" )))); | |||
| 2673 | ||||
| 2674 | check_offset_length(tvb, offset, 0, &abs_offset, &junk_length); | |||
| 2675 | ||||
| 2676 | result_offset = tvb_find_uint8(tvb, abs_offset, maxlength, 0); | |||
| 2677 | ||||
| 2678 | if (result_offset == -1) { | |||
| 2679 | return -1; | |||
| 2680 | } | |||
| 2681 | else { | |||
| 2682 | return result_offset - abs_offset; | |||
| 2683 | } | |||
| 2684 | } | |||
| 2685 | ||||
| 2686 | /* | |||
| 2687 | * Implement strneql etc | |||
| 2688 | */ | |||
| 2689 | ||||
| 2690 | /* | |||
| 2691 | * Call strncmp after checking if enough chars left, returning 0 if | |||
| 2692 | * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1. | |||
| 2693 | */ | |||
| 2694 | int | |||
| 2695 | tvb_strneql(tvbuff_t *tvb, const int offset, const char *str, const size_t size) | |||
| 2696 | { | |||
| 2697 | const uint8_t *ptr; | |||
| 2698 | ||||
| 2699 | ptr = ensure_contiguous_no_exception(tvb, offset, (int)size, NULL((void*)0)); | |||
| 2700 | ||||
| 2701 | if (ptr) { | |||
| 2702 | int cmp = strncmp((const char *)ptr, str, size); | |||
| 2703 | ||||
| 2704 | /* | |||
| 2705 | * Return 0 if equal, -1 otherwise. | |||
| 2706 | */ | |||
| 2707 | return (cmp == 0 ? 0 : -1); | |||
| 2708 | } else { | |||
| 2709 | /* | |||
| 2710 | * Not enough characters in the tvbuff to match the | |||
| 2711 | * string. | |||
| 2712 | */ | |||
| 2713 | return -1; | |||
| 2714 | } | |||
| 2715 | } | |||
| 2716 | ||||
| 2717 | /* | |||
| 2718 | * Call g_ascii_strncasecmp after checking if enough chars left, returning | |||
| 2719 | * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1. | |||
| 2720 | */ | |||
| 2721 | int | |||
| 2722 | tvb_strncaseeql(tvbuff_t *tvb, const int offset, const char *str, const size_t size) | |||
| 2723 | { | |||
| 2724 | const uint8_t *ptr; | |||
| 2725 | ||||
| 2726 | ptr = ensure_contiguous_no_exception(tvb, offset, (int)size, NULL((void*)0)); | |||
| 2727 | ||||
| 2728 | if (ptr) { | |||
| 2729 | int cmp = g_ascii_strncasecmp((const char *)ptr, str, size); | |||
| 2730 | ||||
| 2731 | /* | |||
| 2732 | * Return 0 if equal, -1 otherwise. | |||
| 2733 | */ | |||
| 2734 | return (cmp == 0 ? 0 : -1); | |||
| 2735 | } else { | |||
| 2736 | /* | |||
| 2737 | * Not enough characters in the tvbuff to match the | |||
| 2738 | * string. | |||
| 2739 | */ | |||
| 2740 | return -1; | |||
| 2741 | } | |||
| 2742 | } | |||
| 2743 | ||||
| 2744 | /* | |||
| 2745 | * Check that the tvbuff contains at least size bytes, starting at | |||
| 2746 | * offset, and that those bytes are equal to str. Return 0 for success | |||
| 2747 | * and -1 for error. This function does not throw an exception. | |||
| 2748 | */ | |||
| 2749 | int | |||
| 2750 | tvb_memeql(tvbuff_t *tvb, const int offset, const uint8_t *str, size_t size) | |||
| 2751 | { | |||
| 2752 | const uint8_t *ptr; | |||
| 2753 | ||||
| 2754 | ptr = ensure_contiguous_no_exception(tvb, offset, (int) size, NULL((void*)0)); | |||
| 2755 | ||||
| 2756 | if (ptr) { | |||
| 2757 | int cmp = memcmp(ptr, str, size); | |||
| 2758 | ||||
| 2759 | /* | |||
| 2760 | * Return 0 if equal, -1 otherwise. | |||
| 2761 | */ | |||
| 2762 | return (cmp == 0 ? 0 : -1); | |||
| 2763 | } else { | |||
| 2764 | /* | |||
| 2765 | * Not enough characters in the tvbuff to match the | |||
| 2766 | * string. | |||
| 2767 | */ | |||
| 2768 | return -1; | |||
| 2769 | } | |||
| 2770 | } | |||
| 2771 | ||||
| 2772 | /** | |||
| 2773 | * Format the data in the tvb from offset for size. | |||
| 2774 | */ | |||
| 2775 | char * | |||
| 2776 | tvb_format_text(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int size) | |||
| 2777 | { | |||
| 2778 | const uint8_t *ptr; | |||
| 2779 | int len; | |||
| 2780 | ||||
| 2781 | len = (size > 0) ? size : 0; | |||
| 2782 | ||||
| 2783 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 2784 | return format_text(scope, ptr, len); | |||
| 2785 | } | |||
| 2786 | ||||
| 2787 | /* | |||
| 2788 | * Format the data in the tvb from offset for length ... | |||
| 2789 | */ | |||
| 2790 | char * | |||
| 2791 | tvb_format_text_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const int offset, const int size) | |||
| 2792 | { | |||
| 2793 | const uint8_t *ptr; | |||
| 2794 | int len; | |||
| 2795 | ||||
| 2796 | len = (size > 0) ? size : 0; | |||
| 2797 | ||||
| 2798 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 2799 | return format_text_wsp(allocator, ptr, len); | |||
| 2800 | } | |||
| 2801 | ||||
| 2802 | /** | |||
| 2803 | * Like "tvb_format_text()", but for null-padded strings; don't show | |||
| 2804 | * the null padding characters as "\000". | |||
| 2805 | */ | |||
| 2806 | char * | |||
| 2807 | tvb_format_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int size) | |||
| 2808 | { | |||
| 2809 | const uint8_t *ptr, *p; | |||
| 2810 | int len; | |||
| 2811 | int stringlen; | |||
| 2812 | ||||
| 2813 | len = (size > 0) ? size : 0; | |||
| 2814 | ||||
| 2815 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 2816 | for (p = ptr, stringlen = 0; stringlen < len && *p != '\0'; p++, stringlen++) | |||
| 2817 | ; | |||
| 2818 | return format_text(scope, ptr, stringlen); | |||
| 2819 | } | |||
| 2820 | ||||
| 2821 | /* | |||
| 2822 | * Like "tvb_format_text_wsp()", but for null-padded strings; don't show | |||
| 2823 | * the null padding characters as "\000". | |||
| 2824 | */ | |||
| 2825 | char * | |||
| 2826 | tvb_format_stringzpad_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const int offset, const int size) | |||
| 2827 | { | |||
| 2828 | const uint8_t *ptr, *p; | |||
| 2829 | int len; | |||
| 2830 | int stringlen; | |||
| 2831 | ||||
| 2832 | len = (size > 0) ? size : 0; | |||
| 2833 | ||||
| 2834 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 2835 | for (p = ptr, stringlen = 0; stringlen < len && *p != '\0'; p++, stringlen++) | |||
| 2836 | ; | |||
| 2837 | return format_text_wsp(allocator, ptr, stringlen); | |||
| 2838 | } | |||
| 2839 | ||||
| 2840 | /* | |||
| 2841 | * All string functions below take a scope as an argument. | |||
| 2842 | * | |||
| 2843 | * | |||
| 2844 | * If scope is NULL, memory is allocated with g_malloc() and user must | |||
| 2845 | * explicitly free it with g_free(). | |||
| 2846 | * If scope is not NULL, memory is allocated with the corresponding pool | |||
| 2847 | * lifetime. | |||
| 2848 | * | |||
| 2849 | * All functions throw an exception if the tvbuff ends before the string | |||
| 2850 | * does. | |||
| 2851 | */ | |||
| 2852 | ||||
| 2853 | /* | |||
| 2854 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string | |||
| 2855 | * of bytes referred to by the tvbuff, offset, and length as an ASCII string, | |||
| 2856 | * with all bytes with the high-order bit set being invalid, and return a | |||
| 2857 | * pointer to a UTF-8 string, allocated using the wmem scope. | |||
| 2858 | * | |||
| 2859 | * Octets with the highest bit set will be converted to the Unicode | |||
| 2860 | * REPLACEMENT CHARACTER. | |||
| 2861 | */ | |||
| 2862 | static uint8_t * | |||
| 2863 | tvb_get_ascii_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 2864 | { | |||
| 2865 | const uint8_t *ptr; | |||
| 2866 | ||||
| 2867 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 2868 | return get_ascii_string(scope, ptr, length); | |||
| 2869 | } | |||
| 2870 | ||||
| 2871 | /* | |||
| 2872 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation table, | |||
| 2873 | * treat the string of bytes referred to by the tvbuff, offset, and length | |||
| 2874 | * as a string encoded using one octet per character, with octets with the | |||
| 2875 | * high-order bit clear being mapped by the translation table to 2-byte | |||
| 2876 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT | |||
| 2877 | * CHARACTER) and octets with the high-order bit set being mapped to | |||
| 2878 | * REPLACEMENT CHARACTER, and return a pointer to a UTF-8 string, | |||
| 2879 | * allocated using the wmem scope. | |||
| 2880 | * | |||
| 2881 | * Octets with the highest bit set will be converted to the Unicode | |||
| 2882 | * REPLACEMENT CHARACTER. | |||
| 2883 | */ | |||
| 2884 | static uint8_t * | |||
| 2885 | tvb_get_iso_646_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[0x80]) | |||
| 2886 | { | |||
| 2887 | const uint8_t *ptr; | |||
| 2888 | ||||
| 2889 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 2890 | return get_iso_646_string(scope, ptr, length, table); | |||
| 2891 | } | |||
| 2892 | ||||
| 2893 | /* | |||
| 2894 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string | |||
| 2895 | * of bytes referred to by the tvbuff, the offset. and the length as a UTF-8 | |||
| 2896 | * string, and return a pointer to a UTF-8 string, allocated using the wmem | |||
| 2897 | * scope, with all ill-formed sequences replaced with the Unicode REPLACEMENT | |||
| 2898 | * CHARACTER according to the recommended "best practices" given in the Unicode | |||
| 2899 | * Standard and specified by W3C/WHATWG. | |||
| 2900 | * | |||
| 2901 | * Note that in conformance with the Unicode Standard, this treats three | |||
| 2902 | * byte sequences corresponding to UTF-16 surrogate halves (paired or unpaired) | |||
| 2903 | * and two byte overlong encodings of 7-bit ASCII characters as invalid and | |||
| 2904 | * substitutes REPLACEMENT CHARACTER for them. Explicit support for nonstandard | |||
| 2905 | * derivative encoding formats (e.g. CESU-8, Java Modified UTF-8, WTF-8) could | |||
| 2906 | * be added later. | |||
| 2907 | */ | |||
| 2908 | static uint8_t * | |||
| 2909 | tvb_get_utf_8_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length) | |||
| 2910 | { | |||
| 2911 | const uint8_t *ptr; | |||
| 2912 | ||||
| 2913 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 2914 | return get_utf_8_string(scope, ptr, length); | |||
| 2915 | } | |||
| 2916 | ||||
| 2917 | /* | |||
| 2918 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string | |||
| 2919 | * of bytes referred to by the tvbuff, the offset, and the length as a | |||
| 2920 | * raw string, and return a pointer to that string, allocated using the | |||
| 2921 | * wmem scope. This means a null is appended at the end, but no replacement | |||
| 2922 | * checking is done otherwise, unlike tvb_get_utf_8_string(). | |||
| 2923 | * | |||
| 2924 | * Also, this one allows a length of -1 to mean get all, but does not | |||
| 2925 | * allow a negative offset. | |||
| 2926 | */ | |||
| 2927 | static inline uint8_t * | |||
| 2928 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length) | |||
| 2929 | { | |||
| 2930 | uint8_t *strbuf; | |||
| 2931 | int abs_length = length; | |||
| 2932 | ||||
| 2933 | DISSECTOR_ASSERT(offset >= 0)((void) ((offset >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2933, "offset >= 0" )))); | |||
| 2934 | DISSECTOR_ASSERT(abs_length >= -1)((void) ((abs_length >= -1) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2934, "abs_length >= -1" )))); | |||
| 2935 | ||||
| 2936 | if (abs_length < 0) | |||
| 2937 | abs_length = tvb->length - offset; | |||
| 2938 | ||||
| 2939 | tvb_ensure_bytes_exist(tvb, offset, abs_length); | |||
| 2940 | strbuf = (uint8_t *)wmem_alloc(scope, abs_length + 1); | |||
| 2941 | tvb_memcpy(tvb, strbuf, offset, abs_length); | |||
| 2942 | strbuf[abs_length] = '\0'; | |||
| 2943 | return strbuf; | |||
| 2944 | } | |||
| 2945 | ||||
| 2946 | /* | |||
| 2947 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string | |||
| 2948 | * of bytes referred to by the tvbuff, the offset, and the length as an | |||
| 2949 | * ISO 8859/1 string, and return a pointer to a UTF-8 string, allocated | |||
| 2950 | * using the wmem scope. | |||
| 2951 | */ | |||
| 2952 | static uint8_t * | |||
| 2953 | tvb_get_string_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 2954 | { | |||
| 2955 | const uint8_t *ptr; | |||
| 2956 | ||||
| 2957 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 2958 | return get_8859_1_string(scope, ptr, length); | |||
| 2959 | } | |||
| 2960 | ||||
| 2961 | /* | |||
| 2962 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation | |||
| 2963 | * table, treat the string of bytes referred to by the tvbuff, the offset, | |||
| 2964 | * and the length as a string encoded using one octet per character, with | |||
| 2965 | * octets with the high-order bit clear being ASCII and octets with the | |||
| 2966 | * high-order bit set being mapped by the translation table to 2-byte | |||
| 2967 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT | |||
| 2968 | * CHARACTER), and return a pointer to a UTF-8 string, allocated with the | |||
| 2969 | * wmem scope. | |||
| 2970 | */ | |||
| 2971 | static uint8_t * | |||
| 2972 | tvb_get_string_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[0x80]) | |||
| 2973 | { | |||
| 2974 | const uint8_t *ptr; | |||
| 2975 | ||||
| 2976 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 2977 | return get_unichar2_string(scope, ptr, length, table); | |||
| 2978 | } | |||
| 2979 | ||||
| 2980 | /* | |||
| 2981 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding | |||
| 2982 | * giving the byte order, treat the string of bytes referred to by the | |||
| 2983 | * tvbuff, the offset, and the length as a UCS-2 encoded string in | |||
| 2984 | * the byte order in question, containing characters from the Basic | |||
| 2985 | * Multilingual Plane (plane 0) of Unicode, and return a pointer to a | |||
| 2986 | * UTF-8 string, allocated with the wmem scope. | |||
| 2987 | * | |||
| 2988 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN. | |||
| 2989 | * | |||
| 2990 | * Specify length in bytes. | |||
| 2991 | * | |||
| 2992 | * XXX - should map lead and trail surrogate values to REPLACEMENT | |||
| 2993 | * CHARACTERs (0xFFFD)? | |||
| 2994 | * XXX - if there are an odd number of bytes, should put a | |||
| 2995 | * REPLACEMENT CHARACTER at the end. | |||
| 2996 | */ | |||
| 2997 | static uint8_t * | |||
| 2998 | tvb_get_ucs_2_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding) | |||
| 2999 | { | |||
| 3000 | const uint8_t *ptr; | |||
| 3001 | ||||
| 3002 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3003 | return get_ucs_2_string(scope, ptr, length, encoding); | |||
| 3004 | } | |||
| 3005 | ||||
| 3006 | /* | |||
| 3007 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding | |||
| 3008 | * giving the byte order, treat the string of bytes referred to by the | |||
| 3009 | * tvbuff, the offset, and the length as a UTF-16 encoded string in | |||
| 3010 | * the byte order in question, and return a pointer to a UTF-8 string, | |||
| 3011 | * allocated with the wmem scope. | |||
| 3012 | * | |||
| 3013 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN. | |||
| 3014 | * | |||
| 3015 | * Specify length in bytes. | |||
| 3016 | * | |||
| 3017 | * XXX - should map surrogate errors to REPLACEMENT CHARACTERs (0xFFFD). | |||
| 3018 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs. | |||
| 3019 | * XXX - if there are an odd number of bytes, should put a | |||
| 3020 | * REPLACEMENT CHARACTER at the end. | |||
| 3021 | */ | |||
| 3022 | static uint8_t * | |||
| 3023 | tvb_get_utf_16_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding) | |||
| 3024 | { | |||
| 3025 | const uint8_t *ptr; | |||
| 3026 | ||||
| 3027 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3028 | return get_utf_16_string(scope, ptr, length, encoding); | |||
| 3029 | } | |||
| 3030 | ||||
| 3031 | /* | |||
| 3032 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding | |||
| 3033 | * giving the byte order, treat the string of bytes referred to by the | |||
| 3034 | * tvbuff, the offset, and the length as a UCS-4 encoded string in | |||
| 3035 | * the byte order in question, and return a pointer to a UTF-8 string, | |||
| 3036 | * allocated with the wmem scope. | |||
| 3037 | * | |||
| 3038 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN | |||
| 3039 | * | |||
| 3040 | * Specify length in bytes | |||
| 3041 | * | |||
| 3042 | * XXX - should map lead and trail surrogate values to a "substitute" | |||
| 3043 | * UTF-8 character? | |||
| 3044 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs. | |||
| 3045 | * XXX - if the number of bytes isn't a multiple of 4, should put a | |||
| 3046 | * REPLACEMENT CHARACTER at the end. | |||
| 3047 | */ | |||
| 3048 | static char * | |||
| 3049 | tvb_get_ucs_4_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding) | |||
| 3050 | { | |||
| 3051 | const uint8_t *ptr; | |||
| 3052 | ||||
| 3053 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3054 | return get_ucs_4_string(scope, ptr, length, encoding); | |||
| 3055 | } | |||
| 3056 | ||||
| 3057 | char * | |||
| 3058 | tvb_get_ts_23_038_7bits_string_packed(wmem_allocator_t *scope, tvbuff_t *tvb, | |||
| 3059 | const int bit_offset, int no_of_chars) | |||
| 3060 | { | |||
| 3061 | int in_offset = bit_offset >> 3; /* Current pointer to the input buffer */ | |||
| 3062 | int length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3; | |||
| 3063 | const uint8_t *ptr; | |||
| 3064 | ||||
| 3065 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3065, "tvb && tvb->initialized" )))); | |||
| 3066 | ||||
| 3067 | ptr = ensure_contiguous(tvb, in_offset, length); | |||
| 3068 | return get_ts_23_038_7bits_string_packed(scope, ptr, bit_offset, no_of_chars); | |||
| 3069 | } | |||
| 3070 | ||||
| 3071 | char * | |||
| 3072 | tvb_get_ts_23_038_7bits_string_unpacked(wmem_allocator_t *scope, tvbuff_t *tvb, | |||
| 3073 | const int offset, int length) | |||
| 3074 | { | |||
| 3075 | const uint8_t *ptr; | |||
| 3076 | ||||
| 3077 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3077, "tvb && tvb->initialized" )))); | |||
| 3078 | ||||
| 3079 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3080 | return get_ts_23_038_7bits_string_unpacked(scope, ptr, length); | |||
| 3081 | } | |||
| 3082 | ||||
| 3083 | char * | |||
| 3084 | tvb_get_etsi_ts_102_221_annex_a_string(wmem_allocator_t *scope, tvbuff_t *tvb, | |||
| 3085 | const int offset, int length) | |||
| 3086 | { | |||
| 3087 | const uint8_t *ptr; | |||
| 3088 | ||||
| 3089 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3089, "tvb && tvb->initialized" )))); | |||
| 3090 | ||||
| 3091 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3092 | return get_etsi_ts_102_221_annex_a_string(scope, ptr, length); | |||
| 3093 | } | |||
| 3094 | ||||
| 3095 | char * | |||
| 3096 | tvb_get_ascii_7bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, | |||
| 3097 | const int bit_offset, int no_of_chars) | |||
| 3098 | { | |||
| 3099 | int in_offset = bit_offset >> 3; /* Current pointer to the input buffer */ | |||
| 3100 | int length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3; | |||
| 3101 | const uint8_t *ptr; | |||
| 3102 | ||||
| 3103 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3103, "tvb && tvb->initialized" )))); | |||
| 3104 | ||||
| 3105 | ptr = ensure_contiguous(tvb, in_offset, length); | |||
| 3106 | return get_ascii_7bits_string(scope, ptr, bit_offset, no_of_chars); | |||
| 3107 | } | |||
| 3108 | ||||
| 3109 | /* | |||
| 3110 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation | |||
| 3111 | * table, treat the string of bytes referred to by the tvbuff, the offset, | |||
| 3112 | * and the length as a string encoded using one octet per character, with | |||
| 3113 | * octets being mapped by the translation table to 2-byte Unicode Basic | |||
| 3114 | * Multilingual Plane characters (including REPLACEMENT CHARACTER), and | |||
| 3115 | * return a pointer to a UTF-8 string, allocated with the wmem scope. | |||
| 3116 | */ | |||
| 3117 | static uint8_t * | |||
| 3118 | tvb_get_nonascii_unichar2_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[256]) | |||
| 3119 | { | |||
| 3120 | const uint8_t *ptr; | |||
| 3121 | ||||
| 3122 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3123 | return get_nonascii_unichar2_string(scope, ptr, length, table); | |||
| 3124 | } | |||
| 3125 | ||||
| 3126 | /* | |||
| 3127 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes | |||
| 3128 | * referred to by the tvbuff, offset, and length as a GB18030 encoded string, | |||
| 3129 | * and return a pointer to a UTF-8 string, allocated with the wmem scope, | |||
| 3130 | * converted having substituted REPLACEMENT CHARACTER according to the | |||
| 3131 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion. | |||
| 3132 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf ) | |||
| 3133 | * | |||
| 3134 | * As expected, this will also decode GBK and GB2312 strings. | |||
| 3135 | */ | |||
| 3136 | static uint8_t * | |||
| 3137 | tvb_get_gb18030_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 3138 | { | |||
| 3139 | const uint8_t *ptr; | |||
| 3140 | ||||
| 3141 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3142 | return get_gb18030_string(scope, ptr, length); | |||
| 3143 | } | |||
| 3144 | ||||
| 3145 | /* | |||
| 3146 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes | |||
| 3147 | * referred to by the tvbuff, offset, and length as a EUC-KR encoded string, | |||
| 3148 | * and return a pointer to a UTF-8 string, allocated with the wmem scope, | |||
| 3149 | * converted having substituted REPLACEMENT CHARACTER according to the | |||
| 3150 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion. | |||
| 3151 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf ) | |||
| 3152 | */ | |||
| 3153 | static uint8_t * | |||
| 3154 | tvb_get_euc_kr_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 3155 | { | |||
| 3156 | const uint8_t *ptr; | |||
| 3157 | ||||
| 3158 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3159 | return get_euc_kr_string(scope, ptr, length); | |||
| 3160 | } | |||
| 3161 | ||||
| 3162 | static uint8_t * | |||
| 3163 | tvb_get_t61_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 3164 | { | |||
| 3165 | const uint8_t *ptr; | |||
| 3166 | ||||
| 3167 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3168 | return get_t61_string(scope, ptr, length); | |||
| 3169 | } | |||
| 3170 | ||||
| 3171 | /* | |||
| 3172 | * Encoding tables for BCD strings. | |||
| 3173 | */ | |||
| 3174 | static const dgt_set_t Dgt0_9_bcd = { | |||
| 3175 | { | |||
| 3176 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |||
| 3177 | '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?','?' | |||
| 3178 | } | |||
| 3179 | }; | |||
| 3180 | ||||
| 3181 | static const dgt_set_t Dgt_keypad_abc_tbcd = { | |||
| 3182 | { | |||
| 3183 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |||
| 3184 | '0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?' | |||
| 3185 | } | |||
| 3186 | }; | |||
| 3187 | ||||
| 3188 | static const dgt_set_t Dgt_ansi_tbcd = { | |||
| 3189 | { | |||
| 3190 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |||
| 3191 | '0','1','2','3','4','5','6','7','8','9','?','B','C','*','#','?' | |||
| 3192 | } | |||
| 3193 | }; | |||
| 3194 | ||||
| 3195 | static const dgt_set_t Dgt_dect_standard_4bits_tbcd = { | |||
| 3196 | { | |||
| 3197 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |||
| 3198 | '0','1','2','3','4','5','6','7','8','9','?',' ','?','?','?','?' | |||
| 3199 | } | |||
| 3200 | }; | |||
| 3201 | ||||
| 3202 | static uint8_t * | |||
| 3203 | tvb_get_apn_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, | |||
| 3204 | int length) | |||
| 3205 | { | |||
| 3206 | wmem_strbuf_t *str; | |||
| 3207 | ||||
| 3208 | /* | |||
| 3209 | * This is a domain name. | |||
| 3210 | * | |||
| 3211 | * 3GPP TS 23.003, section 19.4.2 "Fully Qualified Domain Names | |||
| 3212 | * (FQDNs)", subsection 19.4.2.1 "General", says: | |||
| 3213 | * | |||
| 3214 | * The encoding of any identifier used as part of a Fully | |||
| 3215 | * Qualifed Domain Name (FQDN) shall follow the Name Syntax | |||
| 3216 | * defined in IETF RFC 2181 [18], IETF RFC 1035 [19] and | |||
| 3217 | * IETF RFC 1123 [20]. An FQDN consists of one or more | |||
| 3218 | * labels. Each label is coded as a one octet length field | |||
| 3219 | * followed by that number of octets coded as 8 bit ASCII | |||
| 3220 | * characters. | |||
| 3221 | * | |||
| 3222 | * so this does not appear to use full-blown DNS compression - | |||
| 3223 | * the upper 2 bits of the length don't indicate that it's a | |||
| 3224 | * pointer or an extended label (RFC 2673). | |||
| 3225 | */ | |||
| 3226 | str = wmem_strbuf_new_sized(scope, length + 1); | |||
| 3227 | if (length > 0) { | |||
| 3228 | const uint8_t *ptr; | |||
| 3229 | ||||
| 3230 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3231 | ||||
| 3232 | for (;;) { | |||
| 3233 | unsigned label_len; | |||
| 3234 | ||||
| 3235 | /* | |||
| 3236 | * Process this label. | |||
| 3237 | */ | |||
| 3238 | label_len = *ptr; | |||
| 3239 | ptr++; | |||
| 3240 | length--; | |||
| 3241 | ||||
| 3242 | while (label_len != 0) { | |||
| 3243 | uint8_t ch; | |||
| 3244 | ||||
| 3245 | if (length == 0) | |||
| 3246 | goto end; | |||
| 3247 | ||||
| 3248 | ch = *ptr; | |||
| 3249 | if (ch < 0x80) | |||
| 3250 | wmem_strbuf_append_c(str, ch); | |||
| 3251 | else | |||
| 3252 | wmem_strbuf_append_unichar_repl(str)wmem_strbuf_append_unichar(str, 0x00FFFD); | |||
| 3253 | ptr++; | |||
| 3254 | label_len--; | |||
| 3255 | length--; | |||
| 3256 | } | |||
| 3257 | ||||
| 3258 | if (length == 0) | |||
| 3259 | goto end; | |||
| 3260 | ||||
| 3261 | wmem_strbuf_append_c(str, '.'); | |||
| 3262 | } | |||
| 3263 | } | |||
| 3264 | ||||
| 3265 | end: | |||
| 3266 | return (uint8_t *) wmem_strbuf_finalize(str); | |||
| 3267 | } | |||
| 3268 | ||||
| 3269 | static uint8_t * | |||
| 3270 | tvb_get_dect_standard_8bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length) | |||
| 3271 | { | |||
| 3272 | const uint8_t *ptr; | |||
| 3273 | ||||
| 3274 | ptr = ensure_contiguous(tvb, offset, length); | |||
| 3275 | return get_dect_standard_8bits_string(scope, ptr, length); | |||
| 3276 | } | |||
| 3277 | ||||
| 3278 | /* | |||
| 3279 | * Given a tvbuff, an offset, a length, and an encoding, allocate a | |||
| 3280 | * buffer big enough to hold a non-null-terminated string of that length | |||
| 3281 | * at that offset, plus a trailing '\0', copy into the buffer the | |||
| 3282 | * string as converted from the appropriate encoding to UTF-8, and | |||
| 3283 | * return a pointer to the string. | |||
| 3284 | */ | |||
| 3285 | uint8_t * | |||
| 3286 | tvb_get_string_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, | |||
| 3287 | const int length, const unsigned encoding) | |||
| 3288 | { | |||
| 3289 | uint8_t *strptr; | |||
| 3290 | bool_Bool odd, skip_first; | |||
| 3291 | ||||
| 3292 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3292, "tvb && tvb->initialized" )))); | |||
| 3293 | ||||
| 3294 | /* make sure length = -1 fails */ | |||
| 3295 | if (length < 0) { | |||
| 3296 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 3297 | } | |||
| 3298 | ||||
| 3299 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) { | |||
| 3300 | ||||
| 3301 | case ENC_ASCII0x00000000: | |||
| 3302 | default: | |||
| 3303 | /* | |||
| 3304 | * For now, we treat bogus values as meaning | |||
| 3305 | * "ASCII" rather than reporting an error, | |||
| 3306 | * for the benefit of old dissectors written | |||
| 3307 | * when the last argument to proto_tree_add_item() | |||
| 3308 | * was a bool for the byte order, not an | |||
| 3309 | * encoding value, and passed non-zero values | |||
| 3310 | * other than true to mean "little-endian". | |||
| 3311 | */ | |||
| 3312 | strptr = tvb_get_ascii_string(scope, tvb, offset, length); | |||
| 3313 | break; | |||
| 3314 | ||||
| 3315 | case ENC_UTF_80x00000002: | |||
| 3316 | strptr = tvb_get_utf_8_string(scope, tvb, offset, length); | |||
| 3317 | break; | |||
| 3318 | ||||
| 3319 | case ENC_UTF_160x00000004: | |||
| 3320 | strptr = tvb_get_utf_16_string(scope, tvb, offset, length, | |||
| 3321 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3322 | break; | |||
| 3323 | ||||
| 3324 | case ENC_UCS_20x00000006: | |||
| 3325 | strptr = tvb_get_ucs_2_string(scope, tvb, offset, length, | |||
| 3326 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3327 | break; | |||
| 3328 | ||||
| 3329 | case ENC_UCS_40x00000008: | |||
| 3330 | strptr = tvb_get_ucs_4_string(scope, tvb, offset, length, | |||
| 3331 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3332 | break; | |||
| 3333 | ||||
| 3334 | case ENC_ISO_8859_10x0000000A: | |||
| 3335 | /* | |||
| 3336 | * ISO 8859-1 printable code point values are equal | |||
| 3337 | * to the equivalent Unicode code point value, so | |||
| 3338 | * no translation table is needed. | |||
| 3339 | */ | |||
| 3340 | strptr = tvb_get_string_8859_1(scope, tvb, offset, length); | |||
| 3341 | break; | |||
| 3342 | ||||
| 3343 | case ENC_ISO_8859_20x0000000C: | |||
| 3344 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_2); | |||
| 3345 | break; | |||
| 3346 | ||||
| 3347 | case ENC_ISO_8859_30x0000000E: | |||
| 3348 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_3); | |||
| 3349 | break; | |||
| 3350 | ||||
| 3351 | case ENC_ISO_8859_40x00000010: | |||
| 3352 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_4); | |||
| 3353 | break; | |||
| 3354 | ||||
| 3355 | case ENC_ISO_8859_50x00000012: | |||
| 3356 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_5); | |||
| 3357 | break; | |||
| 3358 | ||||
| 3359 | case ENC_ISO_8859_60x00000014: | |||
| 3360 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_6); | |||
| 3361 | break; | |||
| 3362 | ||||
| 3363 | case ENC_ISO_8859_70x00000016: | |||
| 3364 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_7); | |||
| 3365 | break; | |||
| 3366 | ||||
| 3367 | case ENC_ISO_8859_80x00000018: | |||
| 3368 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_8); | |||
| 3369 | break; | |||
| 3370 | ||||
| 3371 | case ENC_ISO_8859_90x0000001A: | |||
| 3372 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_9); | |||
| 3373 | break; | |||
| 3374 | ||||
| 3375 | case ENC_ISO_8859_100x0000001C: | |||
| 3376 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_10); | |||
| 3377 | break; | |||
| 3378 | ||||
| 3379 | case ENC_ISO_8859_110x0000001E: | |||
| 3380 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_11); | |||
| 3381 | break; | |||
| 3382 | ||||
| 3383 | case ENC_ISO_8859_130x00000022: | |||
| 3384 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_13); | |||
| 3385 | break; | |||
| 3386 | ||||
| 3387 | case ENC_ISO_8859_140x00000024: | |||
| 3388 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_14); | |||
| 3389 | break; | |||
| 3390 | ||||
| 3391 | case ENC_ISO_8859_150x00000026: | |||
| 3392 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_15); | |||
| 3393 | break; | |||
| 3394 | ||||
| 3395 | case ENC_ISO_8859_160x00000028: | |||
| 3396 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_16); | |||
| 3397 | break; | |||
| 3398 | ||||
| 3399 | case ENC_WINDOWS_12500x0000002A: | |||
| 3400 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1250); | |||
| 3401 | break; | |||
| 3402 | ||||
| 3403 | case ENC_WINDOWS_12510x0000003C: | |||
| 3404 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1251); | |||
| 3405 | break; | |||
| 3406 | ||||
| 3407 | case ENC_WINDOWS_12520x0000003A: | |||
| 3408 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1252); | |||
| 3409 | break; | |||
| 3410 | ||||
| 3411 | case ENC_MAC_ROMAN0x00000030: | |||
| 3412 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_mac_roman); | |||
| 3413 | break; | |||
| 3414 | ||||
| 3415 | case ENC_CP4370x00000032: | |||
| 3416 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp437); | |||
| 3417 | break; | |||
| 3418 | ||||
| 3419 | case ENC_CP8550x0000003E: | |||
| 3420 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp855); | |||
| 3421 | break; | |||
| 3422 | ||||
| 3423 | case ENC_CP8660x00000040: | |||
| 3424 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp866); | |||
| 3425 | break; | |||
| 3426 | ||||
| 3427 | case ENC_ISO_646_BASIC0x00000042: | |||
| 3428 | strptr = tvb_get_iso_646_string(scope, tvb, offset, length, charset_table_iso_646_basic); | |||
| 3429 | break; | |||
| 3430 | ||||
| 3431 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C: | |||
| 3432 | { | |||
| 3433 | int bit_offset = offset << 3; | |||
| 3434 | int no_of_chars = (length << 3) / 7; | |||
| 3435 | strptr = tvb_get_ts_23_038_7bits_string_packed(scope, tvb, bit_offset, no_of_chars); | |||
| 3436 | } | |||
| 3437 | break; | |||
| 3438 | ||||
| 3439 | case ENC_ASCII_7BITS0x00000034: | |||
| 3440 | { | |||
| 3441 | int bit_offset = offset << 3; | |||
| 3442 | int no_of_chars = (length << 3) / 7; | |||
| 3443 | strptr = tvb_get_ascii_7bits_string(scope, tvb, bit_offset, no_of_chars); | |||
| 3444 | } | |||
| 3445 | break; | |||
| 3446 | ||||
| 3447 | case ENC_EBCDIC0x0000002E: | |||
| 3448 | /* | |||
| 3449 | * "Common" EBCDIC, covering all characters with the | |||
| 3450 | * same code point in all Roman-alphabet EBCDIC code | |||
| 3451 | * pages. | |||
| 3452 | */ | |||
| 3453 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic); | |||
| 3454 | break; | |||
| 3455 | ||||
| 3456 | case ENC_EBCDIC_CP0370x00000038: | |||
| 3457 | /* | |||
| 3458 | * EBCDIC code page 037. | |||
| 3459 | */ | |||
| 3460 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp037); | |||
| 3461 | break; | |||
| 3462 | ||||
| 3463 | case ENC_EBCDIC_CP5000x00000060: | |||
| 3464 | /* | |||
| 3465 | * EBCDIC code page 500. | |||
| 3466 | */ | |||
| 3467 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp500); | |||
| 3468 | break; | |||
| 3469 | ||||
| 3470 | case ENC_T610x00000036: | |||
| 3471 | strptr = tvb_get_t61_string(scope, tvb, offset, length); | |||
| 3472 | break; | |||
| 3473 | ||||
| 3474 | case ENC_BCD_DIGITS_0_90x00000044: | |||
| 3475 | /* | |||
| 3476 | * Packed BCD, with digits 0-9. | |||
| 3477 | */ | |||
| 3478 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16; | |||
| 3479 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17; | |||
| 3480 | strptr = tvb_get_bcd_string(scope, tvb, offset, length, &Dgt0_9_bcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000)); | |||
| 3481 | break; | |||
| 3482 | ||||
| 3483 | case ENC_KEYPAD_ABC_TBCD0x00000046: | |||
| 3484 | /* | |||
| 3485 | * Keypad-with-a/b/c "telephony BCD" - packed BCD, with | |||
| 3486 | * digits 0-9 and symbols *, #, a, b, and c. | |||
| 3487 | */ | |||
| 3488 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16; | |||
| 3489 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17; | |||
| 3490 | strptr = tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_keypad_abc_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000)); | |||
| 3491 | break; | |||
| 3492 | ||||
| 3493 | case ENC_KEYPAD_BC_TBCD0x00000048: | |||
| 3494 | /* | |||
| 3495 | * Keypad-with-B/C "telephony BCD" - packed BCD, with | |||
| 3496 | * digits 0-9 and symbols B, C, *, and #. | |||
| 3497 | */ | |||
| 3498 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16; | |||
| 3499 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17; | |||
| 3500 | strptr = tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_ansi_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000)); | |||
| 3501 | break; | |||
| 3502 | ||||
| 3503 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C: | |||
| 3504 | strptr = tvb_get_ts_23_038_7bits_string_unpacked(scope, tvb, offset, length); | |||
| 3505 | break; | |||
| 3506 | ||||
| 3507 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E: | |||
| 3508 | strptr = tvb_get_etsi_ts_102_221_annex_a_string(scope, tvb, offset, length); | |||
| 3509 | break; | |||
| 3510 | ||||
| 3511 | case ENC_GB180300x00000050: | |||
| 3512 | strptr = tvb_get_gb18030_string(scope, tvb, offset, length); | |||
| 3513 | break; | |||
| 3514 | ||||
| 3515 | case ENC_EUC_KR0x00000052: | |||
| 3516 | strptr = tvb_get_euc_kr_string(scope, tvb, offset, length); | |||
| 3517 | break; | |||
| 3518 | ||||
| 3519 | case ENC_APN_STR0x00000054: | |||
| 3520 | strptr = tvb_get_apn_string(scope, tvb, offset, length); | |||
| 3521 | break; | |||
| 3522 | ||||
| 3523 | case ENC_DECT_STANDARD_8BITS0x00000056: | |||
| 3524 | strptr = tvb_get_dect_standard_8bits_string(scope, tvb, offset, length); | |||
| 3525 | break; | |||
| 3526 | ||||
| 3527 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058: | |||
| 3528 | /* | |||
| 3529 | * DECT standard 4bits "telephony BCD" - packed BCD, with | |||
| 3530 | * digits 0-9 and symbol SPACE for 0xb. | |||
| 3531 | */ | |||
| 3532 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16; | |||
| 3533 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17; | |||
| 3534 | strptr = tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_dect_standard_4bits_tbcd, skip_first, odd, false0); | |||
| 3535 | break; | |||
| 3536 | } | |||
| 3537 | return strptr; | |||
| 3538 | } | |||
| 3539 | ||||
| 3540 | /* | |||
| 3541 | * This is like tvb_get_string_enc(), except that it handles null-padded | |||
| 3542 | * strings. | |||
| 3543 | * | |||
| 3544 | * Currently, string values are stored as UTF-8 null-terminated strings, | |||
| 3545 | * so nothing needs to be done differently for null-padded strings; we | |||
| 3546 | * could save a little memory by not storing the null padding. | |||
| 3547 | * | |||
| 3548 | * If we ever store string values differently, in a fashion that doesn't | |||
| 3549 | * involve null termination, that might change. | |||
| 3550 | */ | |||
| 3551 | uint8_t * | |||
| 3552 | tvb_get_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, | |||
| 3553 | const int length, const unsigned encoding) | |||
| 3554 | { | |||
| 3555 | return tvb_get_string_enc(scope, tvb, offset, length, encoding); | |||
| 3556 | } | |||
| 3557 | ||||
| 3558 | /* | |||
| 3559 | * These routines are like the above routines, except that they handle | |||
| 3560 | * null-terminated strings. They find the length of that string (and | |||
| 3561 | * throw an exception if the tvbuff ends before we find the null), and | |||
| 3562 | * also return through a pointer the length of the string, in bytes, | |||
| 3563 | * including the terminating null (the terminating null being 2 bytes | |||
| 3564 | * for UCS-2 and UTF-16, 4 bytes for UCS-4, and 1 byte for other | |||
| 3565 | * encodings). | |||
| 3566 | */ | |||
| 3567 | static uint8_t * | |||
| 3568 | tvb_get_ascii_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3569 | { | |||
| 3570 | unsigned size; | |||
| 3571 | const uint8_t *ptr; | |||
| 3572 | ||||
| 3573 | size = tvb_strsize(tvb, offset); | |||
| 3574 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3575 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3576 | if (lengthp) | |||
| 3577 | *lengthp = size; | |||
| 3578 | return get_ascii_string(scope, ptr, size); | |||
| 3579 | } | |||
| 3580 | ||||
| 3581 | static uint8_t * | |||
| 3582 | tvb_get_iso_646_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[0x80]) | |||
| 3583 | { | |||
| 3584 | unsigned size; | |||
| 3585 | const uint8_t *ptr; | |||
| 3586 | ||||
| 3587 | size = tvb_strsize(tvb, offset); | |||
| 3588 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3589 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3590 | if (lengthp) | |||
| 3591 | *lengthp = size; | |||
| 3592 | return get_iso_646_string(scope, ptr, size, table); | |||
| 3593 | } | |||
| 3594 | ||||
| 3595 | static uint8_t * | |||
| 3596 | tvb_get_utf_8_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp) | |||
| 3597 | { | |||
| 3598 | unsigned size; | |||
| 3599 | const uint8_t *ptr; | |||
| 3600 | ||||
| 3601 | size = tvb_strsize(tvb, offset); | |||
| 3602 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3603 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3604 | if (lengthp) | |||
| 3605 | *lengthp = size; | |||
| 3606 | return get_utf_8_string(scope, ptr, size); | |||
| 3607 | } | |||
| 3608 | ||||
| 3609 | static uint8_t * | |||
| 3610 | tvb_get_stringz_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3611 | { | |||
| 3612 | unsigned size; | |||
| 3613 | const uint8_t *ptr; | |||
| 3614 | ||||
| 3615 | size = tvb_strsize(tvb, offset); | |||
| 3616 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3617 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3618 | if (lengthp) | |||
| 3619 | *lengthp = size; | |||
| 3620 | return get_8859_1_string(scope, ptr, size); | |||
| 3621 | } | |||
| 3622 | ||||
| 3623 | static uint8_t * | |||
| 3624 | tvb_get_stringz_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[0x80]) | |||
| 3625 | { | |||
| 3626 | unsigned size; | |||
| 3627 | const uint8_t *ptr; | |||
| 3628 | ||||
| 3629 | size = tvb_strsize(tvb, offset); | |||
| 3630 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3631 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3632 | if (lengthp) | |||
| 3633 | *lengthp = size; | |||
| 3634 | return get_unichar2_string(scope, ptr, size, table); | |||
| 3635 | } | |||
| 3636 | ||||
| 3637 | /* | |||
| 3638 | * Given a tvbuff and an offset, with the offset assumed to refer to | |||
| 3639 | * a null-terminated string, find the length of that string (and throw | |||
| 3640 | * an exception if the tvbuff ends before we find the null), ensure that | |||
| 3641 | * the TVB is flat, and return a pointer to the string (in the TVB). | |||
| 3642 | * Also return the length of the string (including the terminating null) | |||
| 3643 | * through a pointer. | |||
| 3644 | * | |||
| 3645 | * As long as we aren't using composite TVBs, this saves the cycles used | |||
| 3646 | * (often unnecessariliy) in allocating a buffer and copying the string into | |||
| 3647 | * it. (If we do start using composite TVBs, we may want to replace this | |||
| 3648 | * function with the _ephemeral version.) | |||
| 3649 | */ | |||
| 3650 | const uint8_t * | |||
| 3651 | tvb_get_const_stringz(tvbuff_t *tvb, const int offset, int *lengthp) | |||
| 3652 | { | |||
| 3653 | unsigned size; | |||
| 3654 | const uint8_t *strptr; | |||
| 3655 | ||||
| 3656 | size = tvb_strsize(tvb, offset); | |||
| 3657 | strptr = ensure_contiguous(tvb, offset, size); | |||
| 3658 | if (lengthp) | |||
| 3659 | *lengthp = size; | |||
| 3660 | return strptr; | |||
| 3661 | } | |||
| 3662 | ||||
| 3663 | static char * | |||
| 3664 | tvb_get_ucs_2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding) | |||
| 3665 | { | |||
| 3666 | int size; /* Number of bytes in string */ | |||
| 3667 | const uint8_t *ptr; | |||
| 3668 | ||||
| 3669 | size = tvb_unicode_strsize(tvb, offset); | |||
| 3670 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3671 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3672 | if (lengthp) | |||
| 3673 | *lengthp = size; | |||
| 3674 | return get_ucs_2_string(scope, ptr, size, encoding); | |||
| 3675 | } | |||
| 3676 | ||||
| 3677 | static char * | |||
| 3678 | tvb_get_utf_16_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding) | |||
| 3679 | { | |||
| 3680 | int size; | |||
| 3681 | const uint8_t *ptr; | |||
| 3682 | ||||
| 3683 | size = tvb_unicode_strsize(tvb, offset); | |||
| 3684 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3685 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3686 | if (lengthp) | |||
| 3687 | *lengthp = size; | |||
| 3688 | return get_utf_16_string(scope, ptr, size, encoding); | |||
| 3689 | } | |||
| 3690 | ||||
| 3691 | static char * | |||
| 3692 | tvb_get_ucs_4_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding) | |||
| 3693 | { | |||
| 3694 | int size; | |||
| 3695 | gunichar uchar; | |||
| 3696 | const uint8_t *ptr; | |||
| 3697 | ||||
| 3698 | size = 0; | |||
| 3699 | do { | |||
| 3700 | /* Endianness doesn't matter when looking for null */ | |||
| 3701 | uchar = tvb_get_ntohl(tvb, offset + size); | |||
| 3702 | size += 4; | |||
| 3703 | } while(uchar != 0); | |||
| 3704 | ||||
| 3705 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3706 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3707 | if (lengthp) | |||
| 3708 | *lengthp = size; | |||
| 3709 | return get_ucs_4_string(scope, ptr, size, encoding); | |||
| 3710 | } | |||
| 3711 | ||||
| 3712 | static uint8_t * | |||
| 3713 | tvb_get_nonascii_unichar2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[256]) | |||
| 3714 | { | |||
| 3715 | unsigned size; | |||
| 3716 | const uint8_t *ptr; | |||
| 3717 | ||||
| 3718 | size = tvb_strsize(tvb, offset); | |||
| 3719 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3720 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3721 | if (lengthp) | |||
| 3722 | *lengthp = size; | |||
| 3723 | return get_nonascii_unichar2_string(scope, ptr, size, table); | |||
| 3724 | } | |||
| 3725 | ||||
| 3726 | static uint8_t * | |||
| 3727 | tvb_get_t61_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3728 | { | |||
| 3729 | unsigned size; | |||
| 3730 | const uint8_t *ptr; | |||
| 3731 | ||||
| 3732 | size = tvb_strsize(tvb, offset); | |||
| 3733 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3734 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3735 | if (lengthp) | |||
| 3736 | *lengthp = size; | |||
| 3737 | return get_t61_string(scope, ptr, size); | |||
| 3738 | } | |||
| 3739 | ||||
| 3740 | static uint8_t * | |||
| 3741 | tvb_get_gb18030_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3742 | { | |||
| 3743 | unsigned size; | |||
| 3744 | const uint8_t *ptr; | |||
| 3745 | ||||
| 3746 | size = tvb_strsize(tvb, offset); | |||
| 3747 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3748 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3749 | if (lengthp) | |||
| 3750 | *lengthp = size; | |||
| 3751 | return get_gb18030_string(scope, ptr, size); | |||
| 3752 | } | |||
| 3753 | ||||
| 3754 | static uint8_t * | |||
| 3755 | tvb_get_euc_kr_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3756 | { | |||
| 3757 | unsigned size; | |||
| 3758 | const uint8_t *ptr; | |||
| 3759 | ||||
| 3760 | size = tvb_strsize(tvb, offset); | |||
| 3761 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3762 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3763 | if (lengthp) | |||
| 3764 | *lengthp = size; | |||
| 3765 | return get_euc_kr_string(scope, ptr, size); | |||
| 3766 | } | |||
| 3767 | ||||
| 3768 | static uint8_t * | |||
| 3769 | tvb_get_dect_standard_8bits_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp) | |||
| 3770 | { | |||
| 3771 | unsigned size; | |||
| 3772 | const uint8_t *ptr; | |||
| 3773 | ||||
| 3774 | size = tvb_strsize(tvb, offset); | |||
| 3775 | ptr = ensure_contiguous(tvb, offset, size); | |||
| 3776 | /* XXX, conversion between signed/unsigned integer */ | |||
| 3777 | if (lengthp) | |||
| 3778 | *lengthp = size; | |||
| 3779 | return get_dect_standard_8bits_string(scope, ptr, size); | |||
| 3780 | } | |||
| 3781 | ||||
| 3782 | uint8_t * | |||
| 3783 | tvb_get_stringz_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding) | |||
| 3784 | { | |||
| 3785 | uint8_t *strptr; | |||
| 3786 | ||||
| 3787 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3787, "tvb && tvb->initialized" )))); | |||
| 3788 | ||||
| 3789 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) { | |||
| 3790 | ||||
| 3791 | case ENC_ASCII0x00000000: | |||
| 3792 | default: | |||
| 3793 | /* | |||
| 3794 | * For now, we treat bogus values as meaning | |||
| 3795 | * "ASCII" rather than reporting an error, | |||
| 3796 | * for the benefit of old dissectors written | |||
| 3797 | * when the last argument to proto_tree_add_item() | |||
| 3798 | * was a bool for the byte order, not an | |||
| 3799 | * encoding value, and passed non-zero values | |||
| 3800 | * other than true to mean "little-endian". | |||
| 3801 | */ | |||
| 3802 | strptr = tvb_get_ascii_stringz(scope, tvb, offset, lengthp); | |||
| 3803 | break; | |||
| 3804 | ||||
| 3805 | case ENC_UTF_80x00000002: | |||
| 3806 | /* | |||
| 3807 | * XXX - should map all invalid UTF-8 sequences | |||
| 3808 | * to a "substitute" UTF-8 character. | |||
| 3809 | * XXX - should map code points > 10FFFF to REPLACEMENT | |||
| 3810 | * CHARACTERs. | |||
| 3811 | */ | |||
| 3812 | strptr = tvb_get_utf_8_stringz(scope, tvb, offset, lengthp); | |||
| 3813 | break; | |||
| 3814 | ||||
| 3815 | case ENC_UTF_160x00000004: | |||
| 3816 | strptr = tvb_get_utf_16_stringz(scope, tvb, offset, lengthp, | |||
| 3817 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3818 | break; | |||
| 3819 | ||||
| 3820 | case ENC_UCS_20x00000006: | |||
| 3821 | strptr = tvb_get_ucs_2_stringz(scope, tvb, offset, lengthp, | |||
| 3822 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3823 | break; | |||
| 3824 | ||||
| 3825 | case ENC_UCS_40x00000008: | |||
| 3826 | strptr = tvb_get_ucs_4_stringz(scope, tvb, offset, lengthp, | |||
| 3827 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000)); | |||
| 3828 | break; | |||
| 3829 | ||||
| 3830 | case ENC_ISO_8859_10x0000000A: | |||
| 3831 | /* | |||
| 3832 | * ISO 8859-1 printable code point values are equal | |||
| 3833 | * to the equivalent Unicode code point value, so | |||
| 3834 | * no translation table is needed. | |||
| 3835 | */ | |||
| 3836 | strptr = tvb_get_stringz_8859_1(scope, tvb, offset, lengthp); | |||
| 3837 | break; | |||
| 3838 | ||||
| 3839 | case ENC_ISO_8859_20x0000000C: | |||
| 3840 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_2); | |||
| 3841 | break; | |||
| 3842 | ||||
| 3843 | case ENC_ISO_8859_30x0000000E: | |||
| 3844 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_3); | |||
| 3845 | break; | |||
| 3846 | ||||
| 3847 | case ENC_ISO_8859_40x00000010: | |||
| 3848 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_4); | |||
| 3849 | break; | |||
| 3850 | ||||
| 3851 | case ENC_ISO_8859_50x00000012: | |||
| 3852 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_5); | |||
| 3853 | break; | |||
| 3854 | ||||
| 3855 | case ENC_ISO_8859_60x00000014: | |||
| 3856 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_6); | |||
| 3857 | break; | |||
| 3858 | ||||
| 3859 | case ENC_ISO_8859_70x00000016: | |||
| 3860 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_7); | |||
| 3861 | break; | |||
| 3862 | ||||
| 3863 | case ENC_ISO_8859_80x00000018: | |||
| 3864 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_8); | |||
| 3865 | break; | |||
| 3866 | ||||
| 3867 | case ENC_ISO_8859_90x0000001A: | |||
| 3868 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_9); | |||
| 3869 | break; | |||
| 3870 | ||||
| 3871 | case ENC_ISO_8859_100x0000001C: | |||
| 3872 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_10); | |||
| 3873 | break; | |||
| 3874 | ||||
| 3875 | case ENC_ISO_8859_110x0000001E: | |||
| 3876 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_11); | |||
| 3877 | break; | |||
| 3878 | ||||
| 3879 | case ENC_ISO_8859_130x00000022: | |||
| 3880 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_13); | |||
| 3881 | break; | |||
| 3882 | ||||
| 3883 | case ENC_ISO_8859_140x00000024: | |||
| 3884 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_14); | |||
| 3885 | break; | |||
| 3886 | ||||
| 3887 | case ENC_ISO_8859_150x00000026: | |||
| 3888 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_15); | |||
| 3889 | break; | |||
| 3890 | ||||
| 3891 | case ENC_ISO_8859_160x00000028: | |||
| 3892 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_16); | |||
| 3893 | break; | |||
| 3894 | ||||
| 3895 | case ENC_WINDOWS_12500x0000002A: | |||
| 3896 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1250); | |||
| 3897 | break; | |||
| 3898 | ||||
| 3899 | case ENC_WINDOWS_12510x0000003C: | |||
| 3900 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1251); | |||
| 3901 | break; | |||
| 3902 | ||||
| 3903 | case ENC_WINDOWS_12520x0000003A: | |||
| 3904 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1252); | |||
| 3905 | break; | |||
| 3906 | ||||
| 3907 | case ENC_MAC_ROMAN0x00000030: | |||
| 3908 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_mac_roman); | |||
| 3909 | break; | |||
| 3910 | ||||
| 3911 | case ENC_CP4370x00000032: | |||
| 3912 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp437); | |||
| 3913 | break; | |||
| 3914 | ||||
| 3915 | case ENC_CP8550x0000003E: | |||
| 3916 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp855); | |||
| 3917 | break; | |||
| 3918 | ||||
| 3919 | case ENC_CP8660x00000040: | |||
| 3920 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp866); | |||
| 3921 | break; | |||
| 3922 | ||||
| 3923 | case ENC_ISO_646_BASIC0x00000042: | |||
| 3924 | strptr = tvb_get_iso_646_stringz(scope, tvb, offset, lengthp, charset_table_iso_646_basic); | |||
| 3925 | break; | |||
| 3926 | ||||
| 3927 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C: | |||
| 3928 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C: | |||
| 3929 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E: | |||
| 3930 | REPORT_DISSECTOR_BUG("TS 23.038 7bits has no null character and doesn't support null-terminated strings")proto_report_dissector_bug("TS 23.038 7bits has no null character and doesn't support null-terminated strings" ); | |||
| 3931 | break; | |||
| 3932 | ||||
| 3933 | case ENC_ASCII_7BITS0x00000034: | |||
| 3934 | REPORT_DISSECTOR_BUG("tvb_get_stringz_enc function with ENC_ASCII_7BITS not implemented yet")proto_report_dissector_bug("tvb_get_stringz_enc function with ENC_ASCII_7BITS not implemented yet" ); | |||
| 3935 | break; | |||
| 3936 | ||||
| 3937 | case ENC_EBCDIC0x0000002E: | |||
| 3938 | /* | |||
| 3939 | * "Common" EBCDIC, covering all characters with the | |||
| 3940 | * same code point in all Roman-alphabet EBCDIC code | |||
| 3941 | * pages. | |||
| 3942 | */ | |||
| 3943 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic); | |||
| 3944 | break; | |||
| 3945 | ||||
| 3946 | case ENC_EBCDIC_CP0370x00000038: | |||
| 3947 | /* | |||
| 3948 | * EBCDIC code page 037. | |||
| 3949 | */ | |||
| 3950 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp037); | |||
| 3951 | break; | |||
| 3952 | ||||
| 3953 | case ENC_EBCDIC_CP5000x00000060: | |||
| 3954 | /* | |||
| 3955 | * EBCDIC code page 500. | |||
| 3956 | */ | |||
| 3957 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp500); | |||
| 3958 | break; | |||
| 3959 | ||||
| 3960 | case ENC_T610x00000036: | |||
| 3961 | strptr = tvb_get_t61_stringz(scope, tvb, offset, lengthp); | |||
| 3962 | break; | |||
| 3963 | ||||
| 3964 | case ENC_GB180300x00000050: | |||
| 3965 | strptr = tvb_get_gb18030_stringz(scope, tvb, offset, lengthp); | |||
| 3966 | break; | |||
| 3967 | ||||
| 3968 | case ENC_EUC_KR0x00000052: | |||
| 3969 | strptr = tvb_get_euc_kr_stringz(scope, tvb, offset, lengthp); | |||
| 3970 | break; | |||
| 3971 | ||||
| 3972 | case ENC_DECT_STANDARD_8BITS0x00000056: | |||
| 3973 | strptr = tvb_get_dect_standard_8bits_stringz(scope, tvb, offset, lengthp); | |||
| 3974 | break; | |||
| 3975 | } | |||
| 3976 | ||||
| 3977 | return strptr; | |||
| 3978 | } | |||
| 3979 | ||||
| 3980 | /* Looks for a stringz (NUL-terminated string) in tvbuff and copies | |||
| 3981 | * no more than bufsize number of bytes, including terminating NUL, to buffer. | |||
| 3982 | * Returns length of string (not including terminating NUL), or -1 if the string was | |||
| 3983 | * truncated in the buffer due to not having reached the terminating NUL. | |||
| 3984 | * In this way, it acts like snprintf(). | |||
| 3985 | * | |||
| 3986 | * bufsize MUST be greater than 0. | |||
| 3987 | * | |||
| 3988 | * When processing a packet where the remaining number of bytes is less | |||
| 3989 | * than bufsize, an exception is not thrown if the end of the packet | |||
| 3990 | * is reached before the NUL is found. If no NUL is found before reaching | |||
| 3991 | * the end of the short packet, -1 is still returned, and the string | |||
| 3992 | * is truncated with a NUL, albeit not at buffer[bufsize - 1], but | |||
| 3993 | * at the correct spot, terminating the string. | |||
| 3994 | * | |||
| 3995 | * *bytes_copied will contain the number of bytes actually copied, | |||
| 3996 | * including the terminating-NUL. | |||
| 3997 | */ | |||
| 3998 | static int | |||
| 3999 | _tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer, int *bytes_copied) | |||
| 4000 | { | |||
| 4001 | int stringlen; | |||
| 4002 | unsigned abs_offset = 0; | |||
| 4003 | int limit, len = 0; | |||
| 4004 | bool_Bool decreased_max = false0; | |||
| 4005 | ||||
| 4006 | /* Only read to end of tvbuff, w/o throwing exception. */ | |||
| 4007 | check_offset_length(tvb, offset, -1, &abs_offset, &len); | |||
| 4008 | ||||
| 4009 | /* There must at least be room for the terminating NUL. */ | |||
| 4010 | DISSECTOR_ASSERT(bufsize != 0)((void) ((bufsize != 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4010, "bufsize != 0" )))); | |||
| 4011 | ||||
| 4012 | /* If there's no room for anything else, just return the NUL. */ | |||
| 4013 | if (bufsize == 1) { | |||
| 4014 | buffer[0] = 0; | |||
| 4015 | *bytes_copied = 1; | |||
| 4016 | return 0; | |||
| 4017 | } | |||
| 4018 | ||||
| 4019 | /* check_offset_length() won't throw an exception if we're | |||
| 4020 | * looking at the byte immediately after the end of the tvbuff. */ | |||
| 4021 | if (len == 0) { | |||
| 4022 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0)); | |||
| 4023 | } | |||
| 4024 | ||||
| 4025 | /* This should not happen because check_offset_length() would | |||
| 4026 | * have already thrown an exception if 'offset' were out-of-bounds. | |||
| 4027 | */ | |||
| 4028 | DISSECTOR_ASSERT(len != -1)((void) ((len != -1) ? (void)0 : (proto_report_dissector_bug( "%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4028, "len != -1" )))); | |||
| 4029 | ||||
| 4030 | /* | |||
| 4031 | * If we've been passed a negative number, bufsize will | |||
| 4032 | * be huge. | |||
| 4033 | */ | |||
| 4034 | DISSECTOR_ASSERT(bufsize <= INT_MAX)((void) ((bufsize <= 2147483647) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4034, "bufsize <= 2147483647" )))); | |||
| 4035 | ||||
| 4036 | if ((unsigned)len < bufsize) { | |||
| 4037 | limit = len; | |||
| 4038 | decreased_max = true1; | |||
| 4039 | } | |||
| 4040 | else { | |||
| 4041 | limit = bufsize; | |||
| 4042 | } | |||
| 4043 | ||||
| 4044 | stringlen = tvb_strnlen(tvb, abs_offset, limit - 1); | |||
| 4045 | /* If NUL wasn't found, copy the data and return -1 */ | |||
| 4046 | if (stringlen == -1) { | |||
| 4047 | tvb_memcpy(tvb, buffer, abs_offset, limit); | |||
| 4048 | if (decreased_max) { | |||
| 4049 | buffer[limit] = 0; | |||
| 4050 | /* Add 1 for the extra NUL that we set at buffer[limit], | |||
| 4051 | * pretending that it was copied as part of the string. */ | |||
| 4052 | *bytes_copied = limit + 1; | |||
| 4053 | } | |||
| 4054 | else { | |||
| 4055 | *bytes_copied = limit; | |||
| 4056 | } | |||
| 4057 | return -1; | |||
| 4058 | } | |||
| 4059 | ||||
| 4060 | /* Copy the string to buffer */ | |||
| 4061 | tvb_memcpy(tvb, buffer, abs_offset, stringlen + 1); | |||
| 4062 | *bytes_copied = stringlen + 1; | |||
| 4063 | return stringlen; | |||
| 4064 | } | |||
| 4065 | ||||
| 4066 | int | |||
| 4067 | tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer) | |||
| 4068 | { | |||
| 4069 | int len, bytes_copied; | |||
| 4070 | ||||
| 4071 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4071, "tvb && tvb->initialized" )))); | |||
| 4072 | ||||
| 4073 | len = _tvb_get_raw_bytes_as_stringz(tvb, offset, bufsize, buffer, &bytes_copied); | |||
| 4074 | ||||
| 4075 | if (len == -1) { | |||
| 4076 | buffer[bufsize - 1] = 0; | |||
| 4077 | return bytes_copied - 1; | |||
| 4078 | } | |||
| 4079 | else { | |||
| 4080 | return len; | |||
| 4081 | } | |||
| 4082 | } | |||
| 4083 | ||||
| 4084 | /* | |||
| 4085 | * Given a tvbuff, an offset into the tvbuff, a buffer, and a buffer size, | |||
| 4086 | * extract as many raw bytes from the tvbuff, starting at the offset, | |||
| 4087 | * as 1) are available in the tvbuff and 2) will fit in the buffer, leaving | |||
| 4088 | * room for a terminating NUL. | |||
| 4089 | */ | |||
| 4090 | int | |||
| 4091 | tvb_get_raw_bytes_as_string(tvbuff_t *tvb, const int offset, char *buffer, size_t bufsize) | |||
| 4092 | { | |||
| 4093 | int len = 0; | |||
| 4094 | ||||
| 4095 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4095, "tvb && tvb->initialized" )))); | |||
| 4096 | ||||
| 4097 | /* There must be room for the string and the terminating NUL. */ | |||
| 4098 | DISSECTOR_ASSERT(bufsize > 0)((void) ((bufsize > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4098, "bufsize > 0" )))); | |||
| 4099 | ||||
| 4100 | DISSECTOR_ASSERT(bufsize - 1 < INT_MAX)((void) ((bufsize - 1 < 2147483647) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4100, "bufsize - 1 < 2147483647" )))); | |||
| 4101 | ||||
| 4102 | len = tvb_captured_length_remaining(tvb, offset); | |||
| 4103 | if (len <= 0) { | |||
| 4104 | buffer[0] = '\0'; | |||
| 4105 | return 0; | |||
| 4106 | } | |||
| 4107 | if (len > (int)(bufsize - 1)) | |||
| 4108 | len = (int)(bufsize - 1); | |||
| 4109 | ||||
| 4110 | /* Copy the string to buffer */ | |||
| 4111 | tvb_memcpy(tvb, buffer, offset, len); | |||
| 4112 | buffer[len] = '\0'; | |||
| 4113 | return len; | |||
| 4114 | } | |||
| 4115 | ||||
| 4116 | bool_Bool | |||
| 4117 | tvb_ascii_isprint(tvbuff_t *tvb, const int offset, const int length) | |||
| 4118 | { | |||
| 4119 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length); | |||
| 4120 | unsigned abs_offset, abs_length = length; | |||
| 4121 | ||||
| 4122 | if (length == -1) { | |||
| 4123 | /* tvb_get_ptr has already checked for exceptions. */ | |||
| 4124 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length); | |||
| 4125 | } | |||
| 4126 | for (unsigned i = 0; i < abs_length; i++, buf++) | |||
| 4127 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0)) | |||
| 4128 | return false0; | |||
| 4129 | ||||
| 4130 | return true1; | |||
| 4131 | } | |||
| 4132 | ||||
| 4133 | bool_Bool | |||
| 4134 | tvb_utf_8_isprint(tvbuff_t *tvb, const int offset, const int length) | |||
| 4135 | { | |||
| 4136 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length); | |||
| 4137 | unsigned abs_offset, abs_length = length; | |||
| 4138 | ||||
| 4139 | if (length == -1) { | |||
| 4140 | /* tvb_get_ptr has already checked for exceptions. */ | |||
| 4141 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length); | |||
| 4142 | } | |||
| 4143 | ||||
| 4144 | return isprint_utf8_string(buf, abs_length); | |||
| 4145 | } | |||
| 4146 | ||||
| 4147 | bool_Bool | |||
| 4148 | tvb_ascii_isdigit(tvbuff_t *tvb, const int offset, const int length) | |||
| 4149 | { | |||
| 4150 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length); | |||
| 4151 | unsigned abs_offset, abs_length = length; | |||
| 4152 | ||||
| 4153 | if (length == -1) { | |||
| 4154 | /* tvb_get_ptr has already checked for exceptions. */ | |||
| 4155 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length); | |||
| 4156 | } | |||
| 4157 | for (unsigned i = 0; i < abs_length; i++, buf++) | |||
| 4158 | if (!g_ascii_isdigit(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_DIGIT) != 0)) | |||
| 4159 | return false0; | |||
| 4160 | ||||
| 4161 | return true1; | |||
| 4162 | } | |||
| 4163 | ||||
| 4164 | static ws_mempbrk_pattern pbrk_crlf; | |||
| 4165 | /* | |||
| 4166 | * Given a tvbuff, an offset into the tvbuff, and a length that starts | |||
| 4167 | * at that offset (which may be -1 for "all the way to the end of the | |||
| 4168 | * tvbuff"), find the end of the (putative) line that starts at the | |||
| 4169 | * specified offset in the tvbuff, going no further than the specified | |||
| 4170 | * length. | |||
| 4171 | * | |||
| 4172 | * Return the length of the line (not counting the line terminator at | |||
| 4173 | * the end), or, if we don't find a line terminator: | |||
| 4174 | * | |||
| 4175 | * if "desegment" is true, return -1; | |||
| 4176 | * | |||
| 4177 | * if "desegment" is false, return the amount of data remaining in | |||
| 4178 | * the buffer. | |||
| 4179 | * | |||
| 4180 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the | |||
| 4181 | * character past the line terminator, or past the end of the buffer if | |||
| 4182 | * we don't find a line terminator. (It's not set if we return -1.) | |||
| 4183 | */ | |||
| 4184 | int | |||
| 4185 | tvb_find_line_end(tvbuff_t *tvb, const int offset, int len, int *next_offset, const bool_Bool desegment) | |||
| 4186 | { | |||
| 4187 | int eob_offset; | |||
| 4188 | int eol_offset; | |||
| 4189 | int linelen; | |||
| 4190 | unsigned char found_needle = 0; | |||
| 4191 | static bool_Bool compiled = false0; | |||
| 4192 | ||||
| 4193 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4193, "tvb && tvb->initialized" )))); | |||
| 4194 | ||||
| 4195 | if (len == -1) { | |||
| 4196 | len = _tvb_captured_length_remaining(tvb, offset); | |||
| 4197 | /* if offset is past the end of the tvbuff, len is now 0 */ | |||
| 4198 | } | |||
| 4199 | ||||
| 4200 | eob_offset = offset + len; | |||
| 4201 | ||||
| 4202 | if (!compiled) { | |||
| 4203 | ws_mempbrk_compile(&pbrk_crlf, "\r\n"); | |||
| 4204 | compiled = true1; | |||
| 4205 | } | |||
| 4206 | ||||
| 4207 | /* | |||
| 4208 | * Look either for a CR or an LF. | |||
| 4209 | */ | |||
| 4210 | eol_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_crlf, &found_needle); | |||
| 4211 | if (eol_offset == -1) { | |||
| 4212 | /* | |||
| 4213 | * No CR or LF - line is presumably continued in next packet. | |||
| 4214 | */ | |||
| 4215 | if (desegment) { | |||
| 4216 | /* | |||
| 4217 | * Tell our caller we saw no EOL, so they can | |||
| 4218 | * try to desegment and get the entire line | |||
| 4219 | * into one tvbuff. | |||
| 4220 | */ | |||
| 4221 | return -1; | |||
| 4222 | } else { | |||
| 4223 | /* | |||
| 4224 | * Pretend the line runs to the end of the tvbuff. | |||
| 4225 | */ | |||
| 4226 | linelen = eob_offset - offset; | |||
| 4227 | if (next_offset) | |||
| 4228 | *next_offset = eob_offset; | |||
| 4229 | } | |||
| 4230 | } else { | |||
| 4231 | /* | |||
| 4232 | * Find the number of bytes between the starting offset | |||
| 4233 | * and the CR or LF. | |||
| 4234 | */ | |||
| 4235 | linelen = eol_offset - offset; | |||
| 4236 | ||||
| 4237 | /* | |||
| 4238 | * Is it a CR? | |||
| 4239 | */ | |||
| 4240 | if (found_needle == '\r') { | |||
| 4241 | /* | |||
| 4242 | * Yes - is it followed by an LF? | |||
| 4243 | */ | |||
| 4244 | if (eol_offset + 1 >= eob_offset) { | |||
| 4245 | /* | |||
| 4246 | * Dunno - the next byte isn't in this | |||
| 4247 | * tvbuff. | |||
| 4248 | */ | |||
| 4249 | if (desegment) { | |||
| 4250 | /* | |||
| 4251 | * We'll return -1, although that | |||
| 4252 | * runs the risk that if the line | |||
| 4253 | * really *is* terminated with a CR, | |||
| 4254 | * we won't properly dissect this | |||
| 4255 | * tvbuff. | |||
| 4256 | * | |||
| 4257 | * It's probably more likely that | |||
| 4258 | * the line ends with CR-LF than | |||
| 4259 | * that it ends with CR by itself. | |||
| 4260 | */ | |||
| 4261 | return -1; | |||
| 4262 | } | |||
| 4263 | } else { | |||
| 4264 | /* | |||
| 4265 | * Well, we can at least look at the next | |||
| 4266 | * byte. | |||
| 4267 | */ | |||
| 4268 | if (tvb_get_uint8(tvb, eol_offset + 1) == '\n') { | |||
| 4269 | /* | |||
| 4270 | * It's an LF; skip over the CR. | |||
| 4271 | */ | |||
| 4272 | eol_offset++; | |||
| 4273 | } | |||
| 4274 | } | |||
| 4275 | } | |||
| 4276 | ||||
| 4277 | /* | |||
| 4278 | * Return the offset of the character after the last | |||
| 4279 | * character in the line, skipping over the last character | |||
| 4280 | * in the line terminator. | |||
| 4281 | */ | |||
| 4282 | if (next_offset) | |||
| 4283 | *next_offset = eol_offset + 1; | |||
| 4284 | } | |||
| 4285 | return linelen; | |||
| 4286 | } | |||
| 4287 | ||||
| 4288 | static ws_mempbrk_pattern pbrk_crlf_dquote; | |||
| 4289 | /* | |||
| 4290 | * Given a tvbuff, an offset into the tvbuff, and a length that starts | |||
| 4291 | * at that offset (which may be -1 for "all the way to the end of the | |||
| 4292 | * tvbuff"), find the end of the (putative) line that starts at the | |||
| 4293 | * specified offset in the tvbuff, going no further than the specified | |||
| 4294 | * length. | |||
| 4295 | * | |||
| 4296 | * However, treat quoted strings inside the buffer specially - don't | |||
| 4297 | * treat newlines in quoted strings as line terminators. | |||
| 4298 | * | |||
| 4299 | * Return the length of the line (not counting the line terminator at | |||
| 4300 | * the end), or the amount of data remaining in the buffer if we don't | |||
| 4301 | * find a line terminator. | |||
| 4302 | * | |||
| 4303 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the | |||
| 4304 | * character past the line terminator, or past the end of the buffer if | |||
| 4305 | * we don't find a line terminator. | |||
| 4306 | */ | |||
| 4307 | int | |||
| 4308 | tvb_find_line_end_unquoted(tvbuff_t *tvb, const int offset, int len, int *next_offset) | |||
| 4309 | { | |||
| 4310 | int cur_offset, char_offset; | |||
| 4311 | bool_Bool is_quoted; | |||
| 4312 | unsigned char c = 0; | |||
| 4313 | int eob_offset; | |||
| 4314 | int linelen; | |||
| 4315 | static bool_Bool compiled = false0; | |||
| 4316 | ||||
| 4317 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4317, "tvb && tvb->initialized" )))); | |||
| 4318 | ||||
| 4319 | if (len == -1) | |||
| 4320 | len = _tvb_captured_length_remaining(tvb, offset); | |||
| 4321 | ||||
| 4322 | if (!compiled) { | |||
| 4323 | ws_mempbrk_compile(&pbrk_crlf_dquote, "\r\n\""); | |||
| 4324 | compiled = true1; | |||
| 4325 | } | |||
| 4326 | ||||
| 4327 | /* | |||
| 4328 | * XXX - what if "len" is still -1, meaning "offset is past the | |||
| 4329 | * end of the tvbuff"? | |||
| 4330 | */ | |||
| 4331 | eob_offset = offset + len; | |||
| 4332 | ||||
| 4333 | cur_offset = offset; | |||
| 4334 | is_quoted = false0; | |||
| 4335 | for (;;) { | |||
| 4336 | /* | |||
| 4337 | * Is this part of the string quoted? | |||
| 4338 | */ | |||
| 4339 | if (is_quoted) { | |||
| 4340 | /* | |||
| 4341 | * Yes - look only for the terminating quote. | |||
| 4342 | */ | |||
| 4343 | char_offset = tvb_find_uint8(tvb, cur_offset, len, | |||
| 4344 | '"'); | |||
| 4345 | } else { | |||
| 4346 | /* | |||
| 4347 | * Look either for a CR, an LF, or a '"'. | |||
| 4348 | */ | |||
| 4349 | char_offset = tvb_ws_mempbrk_pattern_uint8(tvb, cur_offset, len, &pbrk_crlf_dquote, &c); | |||
| 4350 | } | |||
| 4351 | if (char_offset == -1) { | |||
| 4352 | /* | |||
| 4353 | * Not found - line is presumably continued in | |||
| 4354 | * next packet. | |||
| 4355 | * We pretend the line runs to the end of the tvbuff. | |||
| 4356 | */ | |||
| 4357 | linelen = eob_offset - offset; | |||
| 4358 | if (next_offset) | |||
| 4359 | *next_offset = eob_offset; | |||
| 4360 | break; | |||
| 4361 | } | |||
| 4362 | ||||
| 4363 | if (is_quoted) { | |||
| 4364 | /* | |||
| 4365 | * We're processing a quoted string. | |||
| 4366 | * We only looked for ", so we know it's a "; | |||
| 4367 | * as we're processing a quoted string, it's a | |||
| 4368 | * closing quote. | |||
| 4369 | */ | |||
| 4370 | is_quoted = false0; | |||
| 4371 | } else { | |||
| 4372 | /* | |||
| 4373 | * OK, what is it? | |||
| 4374 | */ | |||
| 4375 | if (c == '"') { | |||
| 4376 | /* | |||
| 4377 | * Un-quoted "; it begins a quoted | |||
| 4378 | * string. | |||
| 4379 | */ | |||
| 4380 | is_quoted = true1; | |||
| 4381 | } else { | |||
| 4382 | /* | |||
| 4383 | * It's a CR or LF; we've found a line | |||
| 4384 | * terminator. | |||
| 4385 | * | |||
| 4386 | * Find the number of bytes between the | |||
| 4387 | * starting offset and the CR or LF. | |||
| 4388 | */ | |||
| 4389 | linelen = char_offset - offset; | |||
| 4390 | ||||
| 4391 | /* | |||
| 4392 | * Is it a CR? | |||
| 4393 | */ | |||
| 4394 | if (c == '\r') { | |||
| 4395 | /* | |||
| 4396 | * Yes; is it followed by an LF? | |||
| 4397 | */ | |||
| 4398 | if (char_offset + 1 < eob_offset && | |||
| 4399 | tvb_get_uint8(tvb, char_offset + 1) | |||
| 4400 | == '\n') { | |||
| 4401 | /* | |||
| 4402 | * Yes; skip over the CR. | |||
| 4403 | */ | |||
| 4404 | char_offset++; | |||
| 4405 | } | |||
| 4406 | } | |||
| 4407 | ||||
| 4408 | /* | |||
| 4409 | * Return the offset of the character after | |||
| 4410 | * the last character in the line, skipping | |||
| 4411 | * over the last character in the line | |||
| 4412 | * terminator, and quit. | |||
| 4413 | */ | |||
| 4414 | if (next_offset) | |||
| 4415 | *next_offset = char_offset + 1; | |||
| 4416 | break; | |||
| 4417 | } | |||
| 4418 | } | |||
| 4419 | ||||
| 4420 | /* | |||
| 4421 | * Step past the character we found. | |||
| 4422 | */ | |||
| 4423 | cur_offset = char_offset + 1; | |||
| 4424 | if (cur_offset >= eob_offset) { | |||
| 4425 | /* | |||
| 4426 | * The character we found was the last character | |||
| 4427 | * in the tvbuff - line is presumably continued in | |||
| 4428 | * next packet. | |||
| 4429 | * We pretend the line runs to the end of the tvbuff. | |||
| 4430 | */ | |||
| 4431 | linelen = eob_offset - offset; | |||
| 4432 | if (next_offset) | |||
| 4433 | *next_offset = eob_offset; | |||
| 4434 | break; | |||
| 4435 | } | |||
| 4436 | } | |||
| 4437 | return linelen; | |||
| 4438 | } | |||
| 4439 | ||||
| 4440 | /* | |||
| 4441 | * Copied from the mgcp dissector. (This function should be moved to /epan ) | |||
| 4442 | * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace | |||
| 4443 | * character following offset or offset + maxlength -1 whichever | |||
| 4444 | * is smaller. | |||
| 4445 | * | |||
| 4446 | * Parameters: | |||
| 4447 | * tvb - The tvbuff in which we are skipping whitespace. | |||
| 4448 | * offset - The offset in tvb from which we begin trying to skip whitespace. | |||
| 4449 | * maxlength - The maximum distance from offset that we may try to skip | |||
| 4450 | * whitespace. | |||
| 4451 | * | |||
| 4452 | * Returns: The position in tvb of the first non-whitespace | |||
| 4453 | * character following offset or offset + maxlength -1 whichever | |||
| 4454 | * is smaller. | |||
| 4455 | */ | |||
| 4456 | int | |||
| 4457 | tvb_skip_wsp(tvbuff_t *tvb, const int offset, const int maxlength) | |||
| 4458 | { | |||
| 4459 | int counter; | |||
| 4460 | int end, tvb_len; | |||
| 4461 | uint8_t tempchar; | |||
| 4462 | ||||
| 4463 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4463, "tvb && tvb->initialized" )))); | |||
| 4464 | ||||
| 4465 | /* Get the length remaining */ | |||
| 4466 | /*tvb_len = tvb_captured_length(tvb);*/ | |||
| 4467 | tvb_len = tvb->length; | |||
| 4468 | ||||
| 4469 | end = offset + maxlength; | |||
| 4470 | if (end >= tvb_len) | |||
| 4471 | { | |||
| 4472 | end = tvb_len; | |||
| 4473 | } | |||
| 4474 | ||||
| 4475 | /* Skip past spaces, tabs, CRs and LFs until run out or meet something else */ | |||
| 4476 | for (counter = offset; | |||
| 4477 | counter < end && | |||
| 4478 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' || | |||
| 4479 | tempchar == '\t' || tempchar == '\r' || tempchar == '\n'); | |||
| 4480 | counter++); | |||
| 4481 | ||||
| 4482 | return (counter); | |||
| 4483 | } | |||
| 4484 | ||||
| 4485 | int | |||
| 4486 | tvb_skip_wsp_return(tvbuff_t *tvb, const int offset) | |||
| 4487 | { | |||
| 4488 | int counter; | |||
| 4489 | uint8_t tempchar; | |||
| 4490 | ||||
| 4491 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4491, "tvb && tvb->initialized" )))); | |||
| 4492 | ||||
| 4493 | for (counter = offset; counter > 0 && | |||
| 4494 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' || | |||
| 4495 | tempchar == '\t' || tempchar == '\n' || tempchar == '\r'); counter--); | |||
| 4496 | counter++; | |||
| 4497 | ||||
| 4498 | return (counter); | |||
| 4499 | } | |||
| 4500 | ||||
| 4501 | int | |||
| 4502 | tvb_skip_uint8(tvbuff_t *tvb, int offset, const int maxlength, const uint8_t ch) | |||
| 4503 | { | |||
| 4504 | int end, tvb_len; | |||
| 4505 | ||||
| 4506 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4506, "tvb && tvb->initialized" )))); | |||
| 4507 | ||||
| 4508 | /* Get the length remaining */ | |||
| 4509 | /*tvb_len = tvb_captured_length(tvb);*/ | |||
| 4510 | tvb_len = tvb->length; | |||
| 4511 | ||||
| 4512 | end = offset + maxlength; | |||
| 4513 | if (end >= tvb_len) | |||
| 4514 | end = tvb_len; | |||
| 4515 | ||||
| 4516 | while (offset < end) { | |||
| 4517 | uint8_t tempch = tvb_get_uint8(tvb, offset); | |||
| 4518 | ||||
| 4519 | if (tempch != ch) | |||
| 4520 | break; | |||
| 4521 | offset++; | |||
| 4522 | } | |||
| 4523 | ||||
| 4524 | return offset; | |||
| 4525 | } | |||
| 4526 | ||||
| 4527 | static ws_mempbrk_pattern pbrk_whitespace; | |||
| 4528 | ||||
| 4529 | int tvb_get_token_len(tvbuff_t *tvb, const int offset, int len, int *next_offset, const bool_Bool desegment) | |||
| 4530 | { | |||
| 4531 | int eob_offset; | |||
| 4532 | int eot_offset; | |||
| 4533 | int tokenlen; | |||
| 4534 | unsigned char found_needle = 0; | |||
| 4535 | static bool_Bool compiled = false0; | |||
| 4536 | ||||
| 4537 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4537, "tvb && tvb->initialized" )))); | |||
| 4538 | ||||
| 4539 | if (len == -1) { | |||
| 4540 | len = _tvb_captured_length_remaining(tvb, offset); | |||
| 4541 | /* if offset is past the end of the tvbuff, len is now 0 */ | |||
| 4542 | } | |||
| 4543 | ||||
| 4544 | eob_offset = offset + len; | |||
| 4545 | ||||
| 4546 | if (!compiled) { | |||
| 4547 | ws_mempbrk_compile(&pbrk_whitespace, " \r\n"); | |||
| 4548 | compiled = true1; | |||
| 4549 | } | |||
| 4550 | ||||
| 4551 | /* | |||
| 4552 | * Look either for a space, CR, or LF. | |||
| 4553 | */ | |||
| 4554 | eot_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_whitespace, &found_needle); | |||
| 4555 | if (eot_offset == -1) { | |||
| 4556 | /* | |||
| 4557 | * No space, CR or LF - token is presumably continued in next packet. | |||
| 4558 | */ | |||
| 4559 | if (desegment) { | |||
| 4560 | /* | |||
| 4561 | * Tell our caller we saw no whitespace, so they can | |||
| 4562 | * try to desegment and get the entire line | |||
| 4563 | * into one tvbuff. | |||
| 4564 | */ | |||
| 4565 | return -1; | |||
| 4566 | } | |||
| 4567 | else { | |||
| 4568 | /* | |||
| 4569 | * Pretend the token runs to the end of the tvbuff. | |||
| 4570 | */ | |||
| 4571 | tokenlen = eob_offset - offset; | |||
| 4572 | if (next_offset) | |||
| 4573 | *next_offset = eob_offset; | |||
| 4574 | } | |||
| 4575 | } | |||
| 4576 | else { | |||
| 4577 | /* | |||
| 4578 | * Find the number of bytes between the starting offset | |||
| 4579 | * and the space, CR or LF. | |||
| 4580 | */ | |||
| 4581 | tokenlen = eot_offset - offset; | |||
| 4582 | ||||
| 4583 | /* | |||
| 4584 | * Return the offset of the character after the last | |||
| 4585 | * character in the line, skipping over the last character | |||
| 4586 | * in the line terminator. | |||
| 4587 | */ | |||
| 4588 | if (next_offset) | |||
| 4589 | *next_offset = eot_offset + 1; | |||
| 4590 | } | |||
| 4591 | return tokenlen; | |||
| 4592 | } | |||
| 4593 | ||||
| 4594 | /* | |||
| 4595 | * Format a bunch of data from a tvbuff as bytes, returning a pointer | |||
| 4596 | * to the string with the formatted data, with "punct" as a byte | |||
| 4597 | * separator. | |||
| 4598 | */ | |||
| 4599 | char * | |||
| 4600 | tvb_bytes_to_str_punct(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const char punct) | |||
| 4601 | { | |||
| 4602 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4602, "len >= 0" )))); | |||
| 4603 | return bytes_to_str_punct(scope, ensure_contiguous(tvb, offset, len), len, punct)bytes_to_str_punct_maxlen(scope, ensure_contiguous(tvb, offset , len), len, punct, 24); | |||
| 4604 | } | |||
| 4605 | ||||
| 4606 | /* | |||
| 4607 | * Given a wmem scope, a tvbuff, an offset, a length, an input digit | |||
| 4608 | * set, and a boolean indicator, fetch BCD-encoded digits from a | |||
| 4609 | * tvbuff starting from either the low or high half byte of the | |||
| 4610 | * first byte depending on the boolean indicator (true means "start | |||
| 4611 | * with the high half byte, ignoring the low half byte", and false | |||
| 4612 | * means "start with the low half byte and proceed to the high half | |||
| 4613 | * byte), formating the digits into characters according to the | |||
| 4614 | * input digit set, and return a pointer to a UTF-8 string, allocated | |||
| 4615 | * using the wmem scope. A nibble of 0xf is considered a 'filler' | |||
| 4616 | * and will end the conversion. Similarly if odd is set the last | |||
| 4617 | * high nibble will be omitted. (Note that if both skip_first and | |||
| 4618 | * odd are true, then both the first and last semi-octet are skipped, | |||
| 4619 | * i.e. an even number of nibbles are considered.) | |||
| 4620 | */ | |||
| 4621 | char * | |||
| 4622 | tvb_get_bcd_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int len, const dgt_set_t *dgt, bool_Bool skip_first, bool_Bool odd, bool_Bool bigendian) | |||
| 4623 | { | |||
| 4624 | const uint8_t *ptr; | |||
| 4625 | int i = 0; | |||
| 4626 | char *digit_str; | |||
| 4627 | uint8_t octet, nibble; | |||
| 4628 | ||||
| 4629 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4629, "tvb && tvb->initialized" )))); | |||
| 4630 | ||||
| 4631 | if (len == -1) { | |||
| 4632 | /* | |||
| 4633 | * Run to the end of the captured data. | |||
| 4634 | * | |||
| 4635 | * XXX - captured, or total? | |||
| 4636 | */ | |||
| 4637 | /*length = tvb_captured_length(tvb);*/ | |||
| 4638 | len = tvb->length; | |||
| 4639 | if (len < offset) { | |||
| 4640 | return (char *)""; | |||
| 4641 | } | |||
| 4642 | len -= offset; | |||
| 4643 | } | |||
| 4644 | ||||
| 4645 | ptr = ensure_contiguous(tvb, offset, len); | |||
| 4646 | ||||
| 4647 | /* | |||
| 4648 | * XXX - map illegal digits (digits that map to 0) to REPLACEMENT | |||
| 4649 | * CHARACTER, and have all the tables in epan/tvbuff.c use 0 rather | |||
| 4650 | * than '?'? | |||
| 4651 | */ | |||
| 4652 | digit_str = (char *)wmem_alloc(scope, len*2 + 1); | |||
| 4653 | ||||
| 4654 | while (len > 0) { | |||
| 4655 | octet = *ptr; | |||
| 4656 | if (!skip_first) { | |||
| 4657 | if (bigendian) { | |||
| 4658 | nibble = (octet >> 4) & 0x0f; | |||
| 4659 | } else { | |||
| 4660 | nibble = octet & 0x0f; | |||
| 4661 | } | |||
| 4662 | if (nibble == 0x0f) { | |||
| 4663 | /* | |||
| 4664 | * Stop digit. | |||
| 4665 | */ | |||
| 4666 | break; | |||
| 4667 | } | |||
| 4668 | digit_str[i] = dgt->out[nibble]; | |||
| 4669 | i++; | |||
| 4670 | } | |||
| 4671 | skip_first = false0; | |||
| 4672 | ||||
| 4673 | /* | |||
| 4674 | * unpack second value in byte | |||
| 4675 | */ | |||
| 4676 | if (bigendian) { | |||
| 4677 | nibble = octet & 0x0f; | |||
| 4678 | } else { | |||
| 4679 | nibble = octet >> 4; | |||
| 4680 | } | |||
| 4681 | ||||
| 4682 | if (nibble == 0x0f) { | |||
| 4683 | /* | |||
| 4684 | * This is the stop digit or a filler digit. Ignore | |||
| 4685 | * it. | |||
| 4686 | */ | |||
| 4687 | break; | |||
| 4688 | } | |||
| 4689 | if ((len == 1) && (odd == true1 )){ | |||
| 4690 | /* Last octet, skip last high nibble in case of odd number of digits */ | |||
| 4691 | break; | |||
| 4692 | } | |||
| 4693 | digit_str[i] = dgt->out[nibble]; | |||
| 4694 | i++; | |||
| 4695 | ||||
| 4696 | ptr++; | |||
| 4697 | len--; | |||
| 4698 | } | |||
| 4699 | digit_str[i] = '\0'; | |||
| 4700 | return digit_str; | |||
| 4701 | } | |||
| 4702 | ||||
| 4703 | /* XXXX Fix me - needs odd indicator added */ | |||
| 4704 | const char * | |||
| 4705 | tvb_bcd_dig_to_str(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const dgt_set_t *dgt, bool_Bool skip_first) | |||
| 4706 | { | |||
| 4707 | if (!dgt) | |||
| 4708 | dgt = &Dgt0_9_bcd; | |||
| 4709 | ||||
| 4710 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, false0); | |||
| 4711 | } | |||
| 4712 | ||||
| 4713 | const char * | |||
| 4714 | tvb_bcd_dig_to_str_be(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const dgt_set_t *dgt, bool_Bool skip_first) | |||
| 4715 | { | |||
| 4716 | if (!dgt) | |||
| 4717 | dgt = &Dgt0_9_bcd; | |||
| 4718 | ||||
| 4719 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, true1); | |||
| 4720 | } | |||
| 4721 | ||||
| 4722 | /* | |||
| 4723 | * Format a bunch of data from a tvbuff as bytes, returning a pointer | |||
| 4724 | * to the string with the formatted data. | |||
| 4725 | */ | |||
| 4726 | char *tvb_bytes_to_str(wmem_allocator_t *allocator, tvbuff_t *tvb, | |||
| 4727 | const int offset, const int len) | |||
| 4728 | { | |||
| 4729 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4729, "len >= 0" )))); | |||
| 4730 | return bytes_to_str(allocator, ensure_contiguous(tvb, offset, len), len)bytes_to_str_maxlen(allocator, ensure_contiguous(tvb, offset, len), len, 36); | |||
| 4731 | } | |||
| 4732 | ||||
| 4733 | /* Find a needle tvbuff within a haystack tvbuff. */ | |||
| 4734 | int | |||
| 4735 | tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const int haystack_offset) | |||
| 4736 | { | |||
| 4737 | unsigned haystack_abs_offset = 0, haystack_abs_length = 0; | |||
| 4738 | const uint8_t *haystack_data; | |||
| 4739 | const uint8_t *needle_data; | |||
| 4740 | const unsigned needle_len = needle_tvb->length; | |||
| 4741 | const uint8_t *location; | |||
| 4742 | ||||
| 4743 | DISSECTOR_ASSERT(haystack_tvb && haystack_tvb->initialized)((void) ((haystack_tvb && haystack_tvb->initialized ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 4743, "haystack_tvb && haystack_tvb->initialized" )))); | |||
| 4744 | ||||
| 4745 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) { | |||
| 4746 | return -1; | |||
| 4747 | } | |||
| 4748 | ||||
| 4749 | /* Get pointers to the tvbuffs' data. */ | |||
| 4750 | haystack_data = ensure_contiguous(haystack_tvb, 0, -1); | |||
| 4751 | needle_data = ensure_contiguous(needle_tvb, 0, -1); | |||
| 4752 | ||||
| 4753 | check_offset_length(haystack_tvb, haystack_offset, -1, | |||
| 4754 | &haystack_abs_offset, &haystack_abs_length); | |||
| 4755 | ||||
| 4756 | location = ws_memmem(haystack_data + haystack_abs_offset, haystack_abs_length, | |||
| 4757 | needle_data, needle_len); | |||
| 4758 | ||||
| 4759 | if (location) { | |||
| 4760 | return (int) (location - haystack_data); | |||
| 4761 | } | |||
| 4762 | ||||
| 4763 | return -1; | |||
| 4764 | } | |||
| 4765 | ||||
| 4766 | int | |||
| 4767 | tvb_raw_offset(tvbuff_t *tvb) | |||
| 4768 | { | |||
| 4769 | return ((tvb->raw_offset==-1) ? (tvb->raw_offset = tvb_offset_from_real_beginning(tvb)) : tvb->raw_offset); | |||
| 4770 | } | |||
| 4771 | ||||
| 4772 | void | |||
| 4773 | tvb_set_fragment(tvbuff_t *tvb) | |||
| 4774 | { | |||
| 4775 | tvb->flags |= TVBUFF_FRAGMENT0x00000001; | |||
| 4776 | } | |||
| 4777 | ||||
| 4778 | struct tvbuff * | |||
| 4779 | tvb_get_ds_tvb(tvbuff_t *tvb) | |||
| 4780 | { | |||
| 4781 | return(tvb->ds_tvb); | |||
| 4782 | } | |||
| 4783 | ||||
| 4784 | unsigned | |||
| 4785 | tvb_get_varint(tvbuff_t *tvb, unsigned offset, unsigned maxlen, uint64_t *value, const unsigned encoding) | |||
| 4786 | { | |||
| 4787 | *value = 0; | |||
| 4788 | ||||
| 4789 | switch (encoding & ENC_VARINT_MASK(0x00000002|0x00000004|0x00000008|0x00000010)) { | |||
| 4790 | case ENC_VARINT_PROTOBUF0x00000002: | |||
| 4791 | { | |||
| 4792 | unsigned i; | |||
| 4793 | uint64_t b; /* current byte */ | |||
| 4794 | ||||
| 4795 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) { | |||
| 4796 | b = tvb_get_uint8(tvb, offset++); | |||
| 4797 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */ | |||
| 4798 | ||||
| 4799 | if (b < 0x80) { | |||
| 4800 | /* end successfully because of last byte's msb(most significant bit) is zero */ | |||
| 4801 | return i + 1; | |||
| 4802 | } | |||
| 4803 | } | |||
| 4804 | break; | |||
| 4805 | } | |||
| 4806 | ||||
| 4807 | case ENC_VARINT_ZIGZAG0x00000008: | |||
| 4808 | { | |||
| 4809 | unsigned i; | |||
| 4810 | uint64_t b; /* current byte */ | |||
| 4811 | ||||
| 4812 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) { | |||
| 4813 | b = tvb_get_uint8(tvb, offset++); | |||
| 4814 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */ | |||
| 4815 | ||||
| 4816 | if (b < 0x80) { | |||
| 4817 | /* end successfully because of last byte's msb(most significant bit) is zero */ | |||
| 4818 | *value = (*value >> 1) ^ ((*value & 1) ? -1 : 0); | |||
| 4819 | return i + 1; | |||
| 4820 | } | |||
| 4821 | } | |||
| 4822 | break; | |||
| 4823 | } | |||
| 4824 | ||||
| 4825 | case ENC_VARINT_SDNV0x00000010: | |||
| 4826 | { | |||
| 4827 | /* Decodes similar to protobuf but in MSByte order */ | |||
| 4828 | unsigned i; | |||
| 4829 | uint64_t b; /* current byte */ | |||
| 4830 | ||||
| 4831 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) { | |||
| 4832 | b = tvb_get_uint8(tvb, offset++); | |||
| 4833 | if ((i == 9) && (*value >= UINT64_C(1)1UL<<(64-7))) { | |||
| 4834 | // guaranteed overflow, not valid SDNV | |||
| 4835 | return 0; | |||
| 4836 | } | |||
| 4837 | *value <<= 7; | |||
| 4838 | *value |= (b & 0x7F); /* add lower 7 bits to val */ | |||
| 4839 | ||||
| 4840 | if (b < 0x80) { | |||
| 4841 | /* end successfully because of last byte's msb(most significant bit) is zero */ | |||
| 4842 | return i + 1; | |||
| 4843 | } | |||
| 4844 | } | |||
| 4845 | break; | |||
| 4846 | } | |||
| 4847 | ||||
| 4848 | case ENC_VARINT_QUIC0x00000004: | |||
| 4849 | { | |||
| 4850 | /* calculate variable length */ | |||
| 4851 | *value = tvb_get_uint8(tvb, offset); | |||
| 4852 | switch((*value) >> 6) { | |||
| 4853 | case 0: /* 0b00 => 1 byte length (6 bits Usable) */ | |||
| 4854 | (*value) &= 0x3F; | |||
| 4855 | return 1; | |||
| 4856 | case 1: /* 0b01 => 2 bytes length (14 bits Usable) */ | |||
| 4857 | *value = tvb_get_ntohs(tvb, offset) & 0x3FFF; | |||
| 4858 | return 2; | |||
| 4859 | case 2: /* 0b10 => 4 bytes length (30 bits Usable) */ | |||
| 4860 | *value = tvb_get_ntohl(tvb, offset) & 0x3FFFFFFF; | |||
| 4861 | return 4; | |||
| 4862 | case 3: /* 0b11 => 8 bytes length (62 bits Usable) */ | |||
| 4863 | *value = tvb_get_ntoh64(tvb, offset) & UINT64_C(0x3FFFFFFFFFFFFFFF)0x3FFFFFFFFFFFFFFFUL; | |||
| 4864 | return 8; | |||
| 4865 | default: /* No Possible */ | |||
| 4866 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 4866, __func__, "assertion \"not reached\" failed"); | |||
| 4867 | break; | |||
| 4868 | } | |||
| 4869 | break; | |||
| 4870 | } | |||
| 4871 | ||||
| 4872 | default: | |||
| 4873 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 4873)); | |||
| 4874 | } | |||
| 4875 | ||||
| 4876 | return 0; /* 10 bytes scanned, but no bytes' msb is zero */ | |||
| 4877 | } | |||
| 4878 | ||||
| 4879 | /* | |||
| 4880 | * Editor modelines - https://www.wireshark.org/tools/modelines.html | |||
| 4881 | * | |||
| 4882 | * Local variables: | |||
| 4883 | * c-basic-offset: 8 | |||
| 4884 | * tab-width: 8 | |||
| 4885 | * indent-tabs-mode: t | |||
| 4886 | * End: | |||
| 4887 | * | |||
| 4888 | * vi: set shiftwidth=8 tabstop=8 noexpandtab: | |||
| 4889 | * :indentSize=8:tabSize=8:noTabs=false: | |||
| 4890 | */ |