### Bug Summary

File: | epan/tvbuff.c
Warning: | line 514, column 13 Potential leak of memory pointed to by 'data'

### Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name tvbuff.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-21/lib/clang/21 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /builds/wireshark/wireshark/epan -isystem /builds/wireshark/wireshark/build/epan -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /usr/include/lua5.4 -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -D epan_EXPORTS -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -I /builds/wireshark/wireshark/wiretap -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-nonliteral -std=gnu11 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2025-12-11-100311-3573-1 -x c /builds/wireshark/wireshark/epan/tvbuff.c

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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 been
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 | /* Prevent UB on 2's complement platforms. All tested compilers
247 | * (gcc, clang, MSVC) compile this to a single instruction on
248 | * x86, ARM, RISC-V, S390x, SPARC, etc. at -O1 and higher
249 | * according to godbolt.org. */
250 | unsigned abs_offset = ((unsigned)-(offset + 1)) + 1;
251 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
252 | *offset_ptr = tvb->length - abs_offset;
253 | } else if (abs_offset <= tvb->contained_length) {
254 | return BoundsError1;
255 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
256 | return FragmentBoundsError4;
257 | } else if (abs_offset <= tvb->reported_length) {
258 | return ContainedBoundsError2;
259 | } else {
260 | return ReportedBoundsError3;
261 | }
262 | }
263 |
264 | return 0;
265 | }
266 |
267 | static inline int
268 | compute_offset_and_remaining(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr, unsigned *rem_len)
269 | {
270 | int exception;
271 |
272 | exception = compute_offset(tvb, offset, offset_ptr);
273 | if (!exception)
274 | *rem_len = tvb->length - *offset_ptr;
275 |
276 | return exception;
277 | }
278 |
279 | /* Computes the absolute offset and length based on a possibly-negative offset
280 | * and a length that is possible -1 (which means "to the end of the data").
281 | * Returns integer indicating whether the offset is in bounds (0) or
282 | * not (exception number). The integer ptrs are modified with the new offset,
283 | * captured (available) length, and contained length (amount that's present
284 | * in the parent tvbuff based on its reported length).
285 | * No exception is thrown; on success, we return 0, otherwise we return an
286 | * exception for the caller to throw if appropriate.
287 | *
288 | * XXX - we return success (0), if the offset is positive and right
289 | * after the end of the tvbuff (i.e., equal to the length). We do this
290 | * so that a dissector constructing a subset tvbuff for the next protocol
291 | * will get a zero-length tvbuff, not an exception, if there's no data
292 | * left for the next protocol - we want the next protocol to be the one
293 | * that gets an exception, so the error is reported as an error in that
294 | * protocol rather than the containing protocol. */
295 | static inline int
296 | check_offset_length_no_exception(const tvbuff_t *tvb,
297 | const int offset, int const length_val,
298 | unsigned *offset_ptr, unsigned *length_ptr)
299 | {
300 | unsigned end_offset;
301 | int exception;
302 |
303 | DISSECTOR_ASSERT(offset_ptr)((void) ((offset_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 303, "offset_ptr" ))));
304 | DISSECTOR_ASSERT(length_ptr)((void) ((length_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 304, "length_ptr" ))));
305 |
306 | /* Compute the offset */
307 | exception = compute_offset(tvb, offset, offset_ptr);
308 | if (exception)
309 | return exception;
310 |
311 | if (length_val < -1) {
312 | /* XXX - ReportedBoundsError? */
313 | return BoundsError1;
314 | }
315 |
316 | /* Compute the length */
317 | if (length_val == -1)
318 | *length_ptr = tvb->length - *offset_ptr;
319 | else
320 | *length_ptr = length_val;
321 |
322 | /*
323 | * Compute the offset of the first byte past the length.
324 | */
325 | end_offset = *offset_ptr + *length_ptr;
326 |
327 | /*
328 | * Check for an overflow
329 | */
330 | if (end_offset < *offset_ptr)
331 | return BoundsError1;
332 |
333 | return validate_offset(tvb, end_offset);
334 | }
335 |
336 | /* Checks (+/-) offset and length and throws an exception if
337 | * either is out of bounds. Sets integer ptrs to the new offset
338 | * and length. */
339 | static inline void
340 | check_offset_length(const tvbuff_t *tvb,
341 | const int offset, int const length_val,
342 | unsigned *offset_ptr, unsigned *length_ptr)
343 | {
344 | int exception;
345 |
346 | exception = check_offset_length_no_exception(tvb, offset, length_val, offset_ptr, length_ptr);
347 | if (exception)
348 | THROW(exception)except_throw(1, (exception), ((void*)0));
349 | }
350 |
351 | void
352 | tvb_check_offset_length(const tvbuff_t *tvb,
353 | const int offset, int const length_val,
354 | unsigned *offset_ptr, unsigned *length_ptr)
355 | {
356 | check_offset_length(tvb, offset, length_val, offset_ptr, length_ptr);
357 | }
358 |
359 | static const unsigned char left_aligned_bitmask[] = {
360 | 0xff,
361 | 0x80,
362 | 0xc0,
363 | 0xe0,
364 | 0xf0,
365 | 0xf8,
366 | 0xfc,
367 | 0xfe
368 | };
369 |
370 | tvbuff_t *
371 | tvb_new_octet_aligned(tvbuff_t *tvb, uint32_t bit_offset, int32_t no_of_bits)
372 | {
373 | tvbuff_t *sub_tvb = NULL((void*)0);
374 | uint32_t byte_offset;
375 | int32_t datalen, i;
376 | uint8_t left, right, remaining_bits, *buf;
377 | const uint8_t *data;
378 |
379 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 379, "tvb && tvb->initialized" ))));
380 |
381 | byte_offset = bit_offset >> 3;
382 | left = bit_offset % 8; /* for left-shifting */
383 | right = 8 - left; /* for right-shifting */
384 |
385 | if (no_of_bits == -1) {
386 | datalen = _tvb_captured_length_remaining(tvb, byte_offset);
387 | remaining_bits = 0;
388 | } else {
389 | datalen = no_of_bits >> 3;
390 | remaining_bits = no_of_bits % 8;
391 | if (remaining_bits) {
392 | datalen++;
393 | }
394 | }
395 |
396 | /* already aligned -> shortcut */
397 | if ((left == 0) && (remaining_bits == 0)) {
398 | return tvb_new_subset_length_caplen(tvb, byte_offset, datalen, datalen);
399 | }
400 |
401 | DISSECTOR_ASSERT(datalen>0)((void) ((datalen>0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 401, "datalen>0" ))));
402 |
403 | /* If at least one trailing byte is available, we must use the content
404 | * of that byte for the last shift (i.e. tvb_get_ptr() must use datalen + 1).
405 | * If no extra byte is available, the last shifted byte requires
406 | * special treatment.
407 | */
408 | if (_tvb_captured_length_remaining(tvb, byte_offset) > datalen) {
409 | data = ensure_contiguous(tvb, byte_offset, datalen + 1); /* tvb_get_ptr */
410 |
411 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
412 | buf = (uint8_t *)g_malloc(datalen);
413 |
414 | /* shift tvb data bit_offset bits to the left */
415 | for (i = 0; i < datalen; i++)
416 | buf[i] = (data[i] << left) | (data[i+1] >> right);
417 | } else {
418 | data = ensure_contiguous(tvb, byte_offset, datalen); /* tvb_get_ptr() */
419 |
420 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
421 | buf = (uint8_t *)g_malloc(datalen);
422 |
423 | /* shift tvb data bit_offset bits to the left */
424 | for (i = 0; i < (datalen-1); i++)
425 | buf[i] = (data[i] << left) | (data[i+1] >> right);
426 | buf[datalen-1] = data[datalen-1] << left; /* set last octet */
427 | }
428 | buf[datalen-1] &= left_aligned_bitmask[remaining_bits];
429 |
430 | sub_tvb = tvb_new_child_real_data(tvb, buf, datalen, datalen);
431 | tvb_set_free_cb(sub_tvb, g_free);
432 |
433 | return sub_tvb;
434 | }
435 |
436 | tvbuff_t *
437 | tvb_new_octet_right_aligned(tvbuff_t *tvb, uint32_t bit_offset, int32_t no_of_bits)
438 | {
439 | tvbuff_t *sub_tvb = NULL((void*)0);
440 | uint32_t byte_offset;
441 | int src_len, dst_len, i;
442 | uint8_t left, right, remaining_bits, *buf;
443 | const uint8_t *data;
444 |
445 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 445, "tvb && tvb->initialized" ))));
446 |
447 | byte_offset = bit_offset / 8;
448 | /* right shift to put bits in place and discard least significant bits */
449 | right = bit_offset % 8;
450 | /* left shift to get most significant bits from next octet */
451 | left = 8 - right;
452 |
453 | if (no_of_bits == -1) {
454 | dst_len = _tvb_captured_length_remaining(tvb, byte_offset);
455 | remaining_bits = 0;
456 | } else {
457 | dst_len = no_of_bits / 8;
458 | remaining_bits = no_of_bits % 8;
459 | if (remaining_bits) {
460 | dst_len++;
461 | }
462 | }
463 |
464 | /* already aligned -> shortcut */
465 | if ((right == 0) && (remaining_bits == 0)) {
466 | return tvb_new_subset_length_caplen(tvb, byte_offset, dst_len, dst_len);
467 | }
468 |
469 | DISSECTOR_ASSERT(dst_len>0)((void) ((dst_len>0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 469, "dst_len>0" ))));
470 |
471 | if (_tvb_captured_length_remaining(tvb, byte_offset) > dst_len) {
472 | /* last octet will get data from trailing octet */
473 | src_len = dst_len + 1;
474 | } else {
475 | /* last octet will be zero padded */
476 | src_len = dst_len;
477 | }
478 |
479 | data = ensure_contiguous(tvb, byte_offset, src_len); /* tvb_get_ptr */
480 |
481 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
482 | buf = (uint8_t *)g_malloc(dst_len);
483 |
484 | for (i = 0; i < (dst_len - 1); i++)
485 | buf[i] = (data[i] >> right) | (data[i+1] << left);
486 |
487 | /* Special handling for last octet */
488 | buf[i] = (data[i] >> right);
489 | /* Shift most significant bits from trailing octet if available */
490 | if (src_len > dst_len)
491 | buf[i] |= (data[i+1] << left);
492 | /* Preserve only remaining bits in last octet if not multiple of 8 */
493 | if (remaining_bits)
494 | buf[i] &= ((1 << remaining_bits) - 1);
495 |
496 | sub_tvb = tvb_new_child_real_data(tvb, buf, dst_len, dst_len);
497 | tvb_set_free_cb(sub_tvb, g_free);
498 |
499 | return sub_tvb;
500 | }
501 |
502 | static tvbuff_t *
503 | tvb_generic_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
504 | {
505 | tvbuff_t *cloned_tvb;
506 | uint8_t *data;
507 |
508 | 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", 508, "tvb_bytes_exist(tvb, offset, len)" ))));
5 | ← | '?' condition is true | →
509 |
510 | data = (uint8_t *) g_malloc(len);
6 | ← | Memory is allocated | →
511 |
512 | tvb_memcpy(tvb, data, offset, len);
7 | ← | Calling 'tvb_memcpy' | →
14 | ← | Returning from 'tvb_memcpy' | →
513 |
514 | cloned_tvb = tvb_new_real_data(data, len, len);
15 | ← | Potential leak of memory pointed to by 'data'
515 | tvb_set_free_cb(cloned_tvb, g_free);
516 |
517 | return cloned_tvb;
518 | }
519 |
520 | tvbuff_t *
521 | tvb_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
522 | {
523 | if (tvb->ops->tvb_clone) {
2 | ← | Assuming field 'tvb_clone' is null | →
3 | ← | Taking false branch | →
524 | tvbuff_t *cloned_tvb;
525 |
526 | cloned_tvb = tvb->ops->tvb_clone(tvb, offset, len);
527 | if (cloned_tvb)
528 | return cloned_tvb;
529 | }
530 |
531 | return tvb_generic_clone_offset_len(tvb, offset, len);
4 | ← | Calling 'tvb_generic_clone_offset_len' | →
532 | }
533 |
534 | tvbuff_t *
535 | tvb_clone(tvbuff_t *tvb)
536 | {
537 | return tvb_clone_offset_len(tvb, 0, tvb->length);
1 | Calling 'tvb_clone_offset_len' | →
538 | }
539 |
540 | unsigned
541 | tvb_captured_length(const tvbuff_t *tvb)
542 | {
543 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 543, "tvb && tvb->initialized" ))));
544 |
545 | return tvb->length;
546 | }
547 |
548 | /* For tvbuff internal use */
549 | static inline int
550 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const int offset)
551 | {
552 | unsigned abs_offset = 0, rem_length;
553 | int exception;
554 |
555 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &rem_length);
556 | if (exception)
557 | return 0;
558 |
559 | return rem_length;
560 | }
561 |
562 | int
563 | tvb_captured_length_remaining(const tvbuff_t *tvb, const int offset)
564 | {
565 | unsigned abs_offset = 0, rem_length;
566 | int exception;
567 |
568 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 568, "tvb && tvb->initialized" ))));
569 |
570 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &rem_length);
571 | if (exception)
572 | return 0;
573 |
574 | return rem_length;
575 | }
576 |
577 | unsigned
578 | tvb_ensure_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
579 | {
580 | unsigned rem_length = 0;
581 | int exception;
582 |
583 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 583, "tvb && tvb->initialized" ))));
584 |
585 | exception = validate_offset(tvb, offset);
586 | if (exception)
587 | THROW(exception)except_throw(1, (exception), ((void*)0));
588 |
589 | rem_length = tvb->length - offset;
590 |
591 | if (rem_length == 0) {
592 | /*
593 | * This routine ensures there's at least one byte available.
594 | * There aren't any bytes available, so throw the appropriate
595 | * exception.
596 | */
597 | if (offset < tvb->contained_length) {
598 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
599 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
600 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
601 | } else if (offset < tvb->reported_length) {
602 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
603 | } else {
604 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
605 | }
606 | }
607 | return rem_length;
608 | }
609 |
610 | /* Validates that 'length' bytes are available starting from
611 | * offset (pos/neg). Does not throw an exception. */
612 | bool_Bool
613 | tvb_bytes_exist(const tvbuff_t *tvb, const int offset, const int length)
614 | {
615 | unsigned abs_offset = 0, abs_length;
616 | int exception;
617 |
618 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 618, "tvb && tvb->initialized" ))));
619 |
620 | /*
621 | * Negative lengths are not possible and indicate a bug (e.g. arithmetic
622 | * error or an overly large value from packet data).
623 | */
624 | if (length < 0)
625 | return false0;
626 |
627 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length);
628 | if (exception)
629 | return false0;
630 |
631 | return true1;
632 | }
633 |
634 | /* Validates that 'length' bytes, where 'length' is a 64-bit unsigned
635 | * integer, are available starting from offset (pos/neg). Throws an
636 | * exception if they aren't. */
637 | void
638 | tvb_ensure_bytes_exist64(const tvbuff_t *tvb, const unsigned offset, const uint64_t length)
639 | {
640 | /*
641 | * Make sure the value fits in a signed integer; if not, assume
642 | * that means that it's too big.
643 | */
644 | if (length > INT_MAX2147483647) {
645 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
646 | }
647 |
648 | /* OK, now cast it and try it with tvb_ensure_bytes_exist(). */
649 | tvb_ensure_bytes_exist(tvb, offset, (int)length);
650 | }
651 |
652 | /* Validates that 'length' bytes are available starting from
653 | * offset (pos/neg). Throws an exception if they aren't. */
654 | void
655 | tvb_ensure_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
656 | {
657 | unsigned end_offset;
658 | int exception;
659 |
660 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 660, "tvb && tvb->initialized" ))));
661 |
662 | /*
663 | * -1 doesn't mean "until end of buffer", as that's pointless
664 | * for this routine. We must treat it as a Really Large Positive
665 | * Number, so that we throw an exception; we throw
666 | * ReportedBoundsError, as if it were past even the end of a
667 | * reassembled packet, and past the end of even the data we
668 | * didn't capture.
669 | *
670 | * We do the same with other negative lengths.
671 | */
672 | if (length < 0) {
673 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
674 | }
675 |
676 | exception = validate_offset(tvb, offset);
677 | if (exception)
678 | THROW(exception)except_throw(1, (exception), ((void*)0));
679 |
680 | /*
681 | * Compute the offset of the first byte past the length.
682 | */
683 | end_offset = offset + length;
684 |
685 | /*
686 | * Check for an overflow
687 | */
688 | if (end_offset < offset)
689 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
690 |
691 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length))
692 | return;
693 | else if (end_offset <= tvb->contained_length)
694 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
695 | else if (tvb->flags & TVBUFF_FRAGMENT0x00000001)
696 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
697 | else if (end_offset <= tvb->reported_length)
698 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
699 | else
700 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
701 | }
702 |
703 | bool_Bool
704 | tvb_offset_exists(const tvbuff_t *tvb, const int offset)
705 | {
706 | unsigned abs_offset = 0;
707 | int exception;
708 |
709 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 709, "tvb && tvb->initialized" ))));
710 |
711 | exception = compute_offset(tvb, offset, &abs_offset);
712 | if (exception)
713 | return false0;
714 |
715 | /* compute_offset only throws an exception on >, not >= because of the
716 | * comment above check_offset_length_no_exception, but here we want the
717 | * opposite behaviour so we check ourselves... */
718 | return abs_offset < tvb->length;
719 | }
720 |
721 | unsigned
722 | tvb_reported_length(const tvbuff_t *tvb)
723 | {
724 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 724, "tvb && tvb->initialized" ))));
725 |
726 | return tvb->reported_length;
727 | }
728 |
729 | int
730 | tvb_reported_length_remaining(const tvbuff_t *tvb, const int offset)
731 | {
732 | unsigned abs_offset = 0;
733 | int exception;
734 |
735 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 735, "tvb && tvb->initialized" ))));
736 |
737 | exception = compute_offset(tvb, offset, &abs_offset);
738 | if (exception)
739 | return 0;
740 |
741 | if (tvb->reported_length >= abs_offset)
742 | return tvb->reported_length - abs_offset;
743 | else
744 | return 0;
745 | }
746 |
747 | unsigned
748 | tvb_ensure_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
749 | {
750 | int exception;
751 |
752 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 752, "tvb && tvb->initialized" ))));
753 |
754 | exception = validate_offset(tvb, offset);
755 | if (exception)
756 | THROW(exception)except_throw(1, (exception), ((void*)0));
757 |
758 | if (tvb->reported_length >= offset)
759 | return tvb->reported_length - offset;
760 | else
761 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
762 | }
763 |
764 | /* Set the reported length of a tvbuff to a given value; used for protocols
765 | * whose headers contain an explicit length and where the calling
766 | * dissector's payload may include padding as well as the packet for
767 | * this protocol.
768 | * Also adjusts the available and contained length. */
769 | void
770 | tvb_set_reported_length(tvbuff_t *tvb, const unsigned reported_length)
771 | {
772 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 772, "tvb && tvb->initialized" ))));
773 |
774 | if (reported_length > tvb->reported_length)
775 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
776 |
777 | tvb->reported_length = reported_length;
778 | if (reported_length < tvb->length)
779 | tvb->length = reported_length;
780 | if (reported_length < tvb->contained_length)
781 | tvb->contained_length = reported_length;
782 | }
783 |
784 | /* Repair a tvbuff where the captured length is greater than the
785 | * reported length; such a tvbuff makes no sense, as it's impossible
786 | * to capture more data than is in the packet.
787 | */
788 | void
789 | tvb_fix_reported_length(tvbuff_t *tvb)
790 | {
791 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 791, "tvb && tvb->initialized" ))));
792 | 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", 792, "tvb->reported_length < tvb->length" ))));
793 |
794 | tvb->reported_length = tvb->length;
795 | if (tvb->contained_length < tvb->length)
796 | tvb->contained_length = tvb->length;
797 | }
798 |
799 | unsigned
800 | tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const unsigned counter)
801 | {
802 | if (tvb->ops->tvb_offset)
803 | return tvb->ops->tvb_offset(tvb, counter);
804 |
805 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 805));
806 | return 0;
807 | }
808 |
809 | unsigned
810 | tvb_offset_from_real_beginning(const tvbuff_t *tvb)
811 | {
812 | return tvb_offset_from_real_beginning_counter(tvb, 0);
813 | }
814 |
815 | static inline const uint8_t*
816 | ensure_contiguous_no_exception(tvbuff_t *tvb, const int offset, const int length, int *pexception)
817 | {
818 | unsigned abs_offset = 0, abs_length = 0;
819 | int exception;
820 |
821 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length);
822 | if (exception) {
823 | if (pexception)
824 | *pexception = exception;
825 | return NULL((void*)0);
826 | }
827 |
828 | /*
829 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
830 | * then it is acceptable to have an empty tvb (!tvb->real_data).
831 | */
832 | if (length == 0) {
833 | return NULL((void*)0);
834 | }
835 |
836 | /*
837 | * We know that all the data is present in the tvbuff, so
838 | * no exceptions should be thrown.
839 | */
840 | if (tvb->real_data)
841 | return tvb->real_data + abs_offset;
842 |
843 | if (tvb->ops->tvb_get_ptr)
844 | return tvb->ops->tvb_get_ptr(tvb, abs_offset, abs_length);
845 |
846 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 846));
847 | return NULL((void*)0);
848 | }
849 |
850 | static inline const uint8_t*
851 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length)
852 | {
853 | int exception = 0;
854 | const uint8_t *p;
855 |
856 | p = ensure_contiguous_no_exception(tvb, offset, length, &exception);
857 | if (p == NULL((void*)0) && length != 0) {
858 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 858, "exception > 0" ))));
859 | THROW(exception)except_throw(1, (exception), ((void*)0));
860 | }
861 | return p;
862 | }
863 |
864 | static inline const uint8_t*
865 | fast_ensure_contiguous(tvbuff_t *tvb, const int offset, const unsigned length)
866 | {
867 | unsigned end_offset;
868 | unsigned u_offset;
869 |
870 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 870, "tvb && tvb->initialized" ))));
871 | /* We don't check for overflow in this fast path so we only handle simple types */
872 | DISSECTOR_ASSERT(length <= 8)((void) ((length <= 8) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 872, "length <= 8" ))));
873 |
874 | if (offset < 0 || !tvb->real_data) {
875 | return ensure_contiguous(tvb, offset, length);
876 | }
877 |
878 | u_offset = offset;
879 | end_offset = u_offset + length;
880 |
881 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) {
882 | return tvb->real_data + u_offset;
883 | } else if (end_offset <= tvb->contained_length) {
884 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
885 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
886 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
887 | } else if (end_offset <= tvb->reported_length) {
888 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
889 | } else {
890 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
891 | }
892 | /* not reached */
893 | return NULL((void*)0);
894 | }
895 |
896 |
897 |
898 | /************** ACCESSORS **************/
899 |
900 | void *
901 | tvb_memcpy(tvbuff_t *tvb, void *target, const int offset, size_t length)
902 | {
903 | unsigned abs_offset = 0, abs_length = 0;
904 |
905 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 905, "tvb && tvb->initialized" ))));
8 | ← | '?' condition is true | →
906 |
907 | /*
908 | * XXX - we should eliminate the "length = -1 means 'to the end
909 | * of the tvbuff'" convention, and use other means to achieve
910 | * that; this would let us eliminate a bunch of checks for
911 | * negative lengths in cases where the protocol has a 32-bit
912 | * length field.
913 | *
914 | * Allowing -1 but throwing an assertion on other negative
915 | * lengths is a bit more work with the length being a size_t;
916 | * instead, we check for a length <= 2^31-1.
917 | */
918 | DISSECTOR_ASSERT(length <= 0x7FFFFFFF)((void) ((length <= 0x7FFFFFFF) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 918, "length <= 0x7FFFFFFF" ))));
9 | ← | Assuming 'length' is <= 2147483647 | →
10 | ← | '?' condition is true | →
919 | check_offset_length(tvb, offset, (int) length, &abs_offset, &abs_length);
920 |
921 | if (target && tvb->real_data) {
11 | ← | Assuming 'target' is non-null | →
12 | ← | Assuming field 'real_data' is non-null | →
13 | ← | Taking true branch | →
922 | return memcpy(target, tvb->real_data + abs_offset, abs_length);
923 | }
924 |
925 | if (target && tvb->ops->tvb_memcpy)
926 | return tvb->ops->tvb_memcpy(tvb, target, abs_offset, abs_length);
927 |
928 | /*
929 | * If the length is 0, there's nothing to do.
930 | * (tvb->real_data could be null if it's allocated with
931 | * a size of length.)
932 | */
933 | if (length != 0) {
934 | /*
935 | * XXX, fallback to slower method
936 | */
937 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 937));
938 | }
939 | return NULL((void*)0);
940 | }
941 |
942 |
943 | /*
944 | * XXX - this doesn't treat a length of -1 as an error.
945 | * If it did, this could replace some code that calls
946 | * "tvb_ensure_bytes_exist()" and then allocates a buffer and copies
947 | * data to it.
948 | *
949 | * "composite_get_ptr()" depends on -1 not being
950 | * an error; does anything else depend on this routine treating -1 as
951 | * meaning "to the end of the buffer"?
952 | *
953 | * If scope is NULL, memory is allocated with g_malloc() and user must
954 | * explicitly free it with g_free().
955 | * If scope is not NULL, memory is allocated with the corresponding pool
956 | * lifetime.
957 | */
958 | void *
959 | tvb_memdup(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, size_t length)
960 | {
961 | unsigned abs_offset = 0, abs_length = 0;
962 | void *duped;
963 |
964 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 964, "tvb && tvb->initialized" ))));
965 |
966 | check_offset_length(tvb, offset, (int) length, &abs_offset, &abs_length);
967 |
968 | if (abs_length == 0)
969 | return NULL((void*)0);
970 |
971 | duped = wmem_alloc(scope, abs_length);
972 | return tvb_memcpy(tvb, duped, abs_offset, abs_length);
973 | }
974 |
975 |
976 |
977 | const uint8_t*
978 | tvb_get_ptr(tvbuff_t *tvb, const int offset, const int length)
979 | {
980 | return ensure_contiguous(tvb, offset, length);
981 | }
982 |
983 | /* ---------------- */
984 | uint8_t
985 | tvb_get_uint8(tvbuff_t *tvb, const int offset)
986 | {
987 | const uint8_t *ptr;
988 |
989 | ptr = fast_ensure_contiguous(tvb, offset, 1);
990 | return *ptr;
991 | }
992 |
993 | int8_t
994 | tvb_get_int8(tvbuff_t *tvb, const int offset)
995 | {
996 | const uint8_t *ptr;
997 |
998 | ptr = fast_ensure_contiguous(tvb, offset, 1);
999 | return *ptr;
1000 | }
1001 |
1002 | uint16_t
1003 | tvb_get_ntohs(tvbuff_t *tvb, const int offset)
1004 | {
1005 | const uint8_t *ptr;
1006 |
1007 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1008 | return pntohu16(ptr);
1009 | }
1010 |
1011 | int16_t
1012 | tvb_get_ntohis(tvbuff_t *tvb, const int offset)
1013 | {
1014 | const uint8_t *ptr;
1015 |
1016 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1017 | return pntohu16(ptr);
1018 | }
1019 |
1020 | uint32_t
1021 | tvb_get_ntoh24(tvbuff_t *tvb, const int offset)
1022 | {
1023 | const uint8_t *ptr;
1024 |
1025 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1026 | return pntohu24(ptr);
1027 | }
1028 |
1029 | int32_t
1030 | tvb_get_ntohi24(tvbuff_t *tvb, const int offset)
1031 | {
1032 | uint32_t ret;
1033 |
1034 | ret = ws_sign_ext32(tvb_get_ntoh24(tvb, offset), 24);
1035 |
1036 | return (int32_t)ret;
1037 | }
1038 |
1039 | uint32_t
1040 | tvb_get_ntohl(tvbuff_t *tvb, const int offset)
1041 | {
1042 | const uint8_t *ptr;
1043 |
1044 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1045 | return pntohu32(ptr);
1046 | }
1047 |
1048 | int32_t
1049 | tvb_get_ntohil(tvbuff_t *tvb, const int offset)
1050 | {
1051 | const uint8_t *ptr;
1052 |
1053 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1054 | return pntohu32(ptr);
1055 | }
1056 |
1057 | uint64_t
1058 | tvb_get_ntoh40(tvbuff_t *tvb, const int offset)
1059 | {
1060 | const uint8_t *ptr;
1061 |
1062 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1063 | return pntohu40(ptr);
1064 | }
1065 |
1066 | int64_t
1067 | tvb_get_ntohi40(tvbuff_t *tvb, const int offset)
1068 | {
1069 | uint64_t ret;
1070 |
1071 | ret = ws_sign_ext64(tvb_get_ntoh40(tvb, offset), 40);
1072 |
1073 | return (int64_t)ret;
1074 | }
1075 |
1076 | uint64_t
1077 | tvb_get_ntoh48(tvbuff_t *tvb, const int offset)
1078 | {
1079 | const uint8_t *ptr;
1080 |
1081 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1082 | return pntohu48(ptr);
1083 | }
1084 |
1085 | int64_t
1086 | tvb_get_ntohi48(tvbuff_t *tvb, const int offset)
1087 | {
1088 | uint64_t ret;
1089 |
1090 | ret = ws_sign_ext64(tvb_get_ntoh48(tvb, offset), 48);
1091 |
1092 | return (int64_t)ret;
1093 | }
1094 |
1095 | uint64_t
1096 | tvb_get_ntoh56(tvbuff_t *tvb, const int offset)
1097 | {
1098 | const uint8_t *ptr;
1099 |
1100 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1101 | return pntohu56(ptr);
1102 | }
1103 |
1104 | int64_t
1105 | tvb_get_ntohi56(tvbuff_t *tvb, const int offset)
1106 | {
1107 | uint64_t ret;
1108 |
1109 | ret = ws_sign_ext64(tvb_get_ntoh56(tvb, offset), 56);
1110 |
1111 | return (int64_t)ret;
1112 | }
1113 |
1114 | uint64_t
1115 | tvb_get_ntoh64(tvbuff_t *tvb, const int offset)
1116 | {
1117 | const uint8_t *ptr;
1118 |
1119 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1120 | return pntohu64(ptr);
1121 | }
1122 |
1123 | int64_t
1124 | tvb_get_ntohi64(tvbuff_t *tvb, const int offset)
1125 | {
1126 | const uint8_t *ptr;
1127 |
1128 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1129 | return pntohu64(ptr);
1130 | }
1131 |
1132 | uint16_t
1133 | tvb_get_uint16(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1134 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1135 | return tvb_get_letohs(tvb, offset);
1136 | } else {
1137 | return tvb_get_ntohs(tvb, offset);
1138 | }
1139 | }
1140 |
1141 | int16_t
1142 | tvb_get_int16(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1143 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1144 | return tvb_get_letohis(tvb, offset);
1145 | } else {
1146 | return tvb_get_ntohis(tvb, offset);
1147 | }
1148 | }
1149 |
1150 | uint32_t
1151 | tvb_get_uint24(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1152 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1153 | return tvb_get_letoh24(tvb, offset);
1154 | } else {
1155 | return tvb_get_ntoh24(tvb, offset);
1156 | }
1157 | }
1158 |
1159 | int32_t
1160 | tvb_get_int24(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1161 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1162 | return tvb_get_letohi24(tvb, offset);
1163 | } else {
1164 | return tvb_get_ntohi24(tvb, offset);
1165 | }
1166 | }
1167 |
1168 | uint32_t
1169 | tvb_get_uint32(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1170 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1171 | return tvb_get_letohl(tvb, offset);
1172 | } else {
1173 | return tvb_get_ntohl(tvb, offset);
1174 | }
1175 | }
1176 |
1177 | int32_t
1178 | tvb_get_int32(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1179 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1180 | return tvb_get_letohil(tvb, offset);
1181 | } else {
1182 | return tvb_get_ntohil(tvb, offset);
1183 | }
1184 | }
1185 |
1186 | uint64_t
1187 | tvb_get_uint40(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1188 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1189 | return tvb_get_letoh40(tvb, offset);
1190 | } else {
1191 | return tvb_get_ntoh40(tvb, offset);
1192 | }
1193 | }
1194 |
1195 | int64_t
1196 | tvb_get_int40(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1197 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1198 | return tvb_get_letohi40(tvb, offset);
1199 | } else {
1200 | return tvb_get_ntohi40(tvb, offset);
1201 | }
1202 | }
1203 |
1204 | uint64_t
1205 | tvb_get_uint48(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1206 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1207 | return tvb_get_letoh48(tvb, offset);
1208 | } else {
1209 | return tvb_get_ntoh48(tvb, offset);
1210 | }
1211 | }
1212 |
1213 | int64_t
1214 | tvb_get_int48(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1215 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1216 | return tvb_get_letohi48(tvb, offset);
1217 | } else {
1218 | return tvb_get_ntohi48(tvb, offset);
1219 | }
1220 | }
1221 |
1222 | uint64_t
1223 | tvb_get_uint56(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1224 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1225 | return tvb_get_letoh56(tvb, offset);
1226 | } else {
1227 | return tvb_get_ntoh56(tvb, offset);
1228 | }
1229 | }
1230 |
1231 | int64_t
1232 | tvb_get_int56(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1233 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1234 | return tvb_get_letohi56(tvb, offset);
1235 | } else {
1236 | return tvb_get_ntohi56(tvb, offset);
1237 | }
1238 | }
1239 |
1240 | uint64_t
1241 | tvb_get_uint64(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1242 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1243 | return tvb_get_letoh64(tvb, offset);
1244 | } else {
1245 | return tvb_get_ntoh64(tvb, offset);
1246 | }
1247 | }
1248 |
1249 | uint64_t
1250 | tvb_get_uint64_with_length(tvbuff_t *tvb, const int offset, unsigned length, const unsigned encoding)
1251 | {
1252 | uint64_t value;
1253 |
1254 | switch (length) {
1255 |
1256 | case 1:
1257 | value = tvb_get_uint8(tvb, offset);
1258 | break;
1259 |
1260 | case 2:
1261 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohs(tvb, offset)
1262 | : tvb_get_ntohs(tvb, offset);
1263 | break;
1264 |
1265 | case 3:
1266 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh24(tvb, offset)
1267 | : tvb_get_ntoh24(tvb, offset);
1268 | break;
1269 |
1270 | case 4:
1271 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohl(tvb, offset)
1272 | : tvb_get_ntohl(tvb, offset);
1273 | break;
1274 |
1275 | case 5:
1276 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh40(tvb, offset)
1277 | : tvb_get_ntoh40(tvb, offset);
1278 | break;
1279 |
1280 | case 6:
1281 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh48(tvb, offset)
1282 | : tvb_get_ntoh48(tvb, offset);
1283 | break;
1284 |
1285 | case 7:
1286 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh56(tvb, offset)
1287 | : tvb_get_ntoh56(tvb, offset);
1288 | break;
1289 |
1290 | case 8:
1291 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1292 | : tvb_get_ntoh64(tvb, offset);
1293 | break;
1294 |
1295 | default:
1296 | if (length < 1) {
1297 | value = 0;
1298 | } else {
1299 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1300 | : tvb_get_ntoh64(tvb, offset);
1301 | }
1302 | break;
1303 | }
1304 | return value;
1305 | }
1306 |
1307 | int64_t
1308 | tvb_get_int64(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1309 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1310 | return tvb_get_letohi64(tvb, offset);
1311 | } else {
1312 | return tvb_get_ntohi64(tvb, offset);
1313 | }
1314 | }
1315 |
1316 | float
1317 | tvb_get_ieee_float(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1318 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1319 | return tvb_get_letohieee_float(tvb, offset);
1320 | } else {
1321 | return tvb_get_ntohieee_float(tvb, offset);
1322 | }
1323 | }
1324 |
1325 | double
1326 | tvb_get_ieee_double(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1327 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1328 | return tvb_get_letohieee_double(tvb, offset);
1329 | } else {
1330 | return tvb_get_ntohieee_double(tvb, offset);
1331 | }
1332 | }
1333 |
1334 | /*
1335 | * Stuff for IEEE float handling on platforms that don't have IEEE
1336 | * format as the native floating-point format.
1337 | *
1338 | * For now, we treat only the VAX as such a platform.
1339 | *
1340 | * XXX - other non-IEEE boxes that can run UN*X include some Crays,
1341 | * and possibly other machines. However, I don't know whether there
1342 | * are any other machines that could run Wireshark and that don't use
1343 | * IEEE format. As far as I know, all of the main current and past
1344 | * commercial microprocessor families on which OSes that support
1345 | * Wireshark can run use IEEE format (x86, ARM, 68k, SPARC, MIPS,
1346 | * PA-RISC, Alpha, IA-64, and so on), and it appears that the official
1347 | * Linux port to System/390 and zArchitecture uses IEEE format floating-
1348 | * point rather than IBM hex floating-point (not a huge surprise), so
1349 | * I'm not sure that leaves any 32-bit or larger UN*X or Windows boxes,
1350 | * other than VAXes, that don't use IEEE format. If you're not running
1351 | * UN*X or Windows, the floating-point format is probably going to be
1352 | * the least of your problems in a port.
1353 | */
1354 |
1355 | #if defined(vax)
1356 |
1357 | #include <math.h>
1358 |
1359 | /*
1360 | * Single-precision.
1361 | */
1362 | #define IEEE_SP_NUMBER_WIDTH 32 /* bits in number */
1363 | #define IEEE_SP_EXP_WIDTH 8 /* bits in exponent */
1364 | #define IEEE_SP_MANTISSA_WIDTH 23 /* IEEE_SP_NUMBER_WIDTH - 1 - IEEE_SP_EXP_WIDTH */
1365 |
1366 | #define IEEE_SP_SIGN_MASK 0x80000000
1367 | #define IEEE_SP_EXPONENT_MASK 0x7F800000
1368 | #define IEEE_SP_MANTISSA_MASK 0x007FFFFF
1369 | #define IEEE_SP_INFINITY IEEE_SP_EXPONENT_MASK
1370 |
1371 | #define IEEE_SP_IMPLIED_BIT (1 << IEEE_SP_MANTISSA_WIDTH)
1372 | #define IEEE_SP_INFINITE ((1 << IEEE_SP_EXP_WIDTH) - 1)
1373 | #define IEEE_SP_BIAS ((1 << (IEEE_SP_EXP_WIDTH - 1)) - 1)
1374 |
1375 | static int
1376 | ieee_float_is_zero(const uint32_t w)
1377 | {
1378 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1379 | }
1380 |
1381 | static float
1382 | get_ieee_float(const uint32_t w)
1383 | {
1384 | long sign;
1385 | long exponent;
1386 | long mantissa;
1387 |
1388 | sign = w & IEEE_SP_SIGN_MASK;
1389 | exponent = w & IEEE_SP_EXPONENT_MASK;
1390 | mantissa = w & IEEE_SP_MANTISSA_MASK;
1391 |
1392 | if (ieee_float_is_zero(w)) {
1393 | /* number is zero, unnormalized, or not-a-number */
1394 | return 0.0;
1395 | }
1396 | #if 0
1397 | /*
1398 | * XXX - how to handle this?
1399 | */
1400 | if (IEEE_SP_INFINITY == exponent) {
1401 | /*
1402 | * number is positive or negative infinity, or a special value
1403 | */
1404 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1405 | }
1406 | #endif
1407 |
1408 | exponent = ((exponent >> IEEE_SP_MANTISSA_WIDTH) - IEEE_SP_BIAS) -
1409 | IEEE_SP_MANTISSA_WIDTH;
1410 | mantissa |= IEEE_SP_IMPLIED_BIT;
1411 |
1412 | if (sign)
1413 | return -mantissa * pow(2, exponent);
1414 | else
1415 | return mantissa * pow(2, exponent);
1416 | }
1417 |
1418 | /*
1419 | * Double-precision.
1420 | * We assume that if you don't have IEEE floating-point, you have a
1421 | * compiler that understands 64-bit integral quantities.
1422 | */
1423 | #define IEEE_DP_NUMBER_WIDTH 64 /* bits in number */
1424 | #define IEEE_DP_EXP_WIDTH 11 /* bits in exponent */
1425 | #define IEEE_DP_MANTISSA_WIDTH 52 /* IEEE_DP_NUMBER_WIDTH - 1 - IEEE_DP_EXP_WIDTH */
1426 |
1427 | #define IEEE_DP_SIGN_MASK INT64_C(0x8000000000000000)0x8000000000000000L
1428 | #define IEEE_DP_EXPONENT_MASK INT64_C(0x7FF0000000000000)0x7FF0000000000000L
1429 | #define IEEE_DP_MANTISSA_MASK INT64_C(0x000FFFFFFFFFFFFF)0x000FFFFFFFFFFFFFL
1430 | #define IEEE_DP_INFINITY IEEE_DP_EXPONENT_MASK
1431 |
1432 | #define IEEE_DP_IMPLIED_BIT (INT64_C(1)1L << IEEE_DP_MANTISSA_WIDTH)
1433 | #define IEEE_DP_INFINITE ((1 << IEEE_DP_EXP_WIDTH) - 1)
1434 | #define IEEE_DP_BIAS ((1 << (IEEE_DP_EXP_WIDTH - 1)) - 1)
1435 |
1436 | static int
1437 | ieee_double_is_zero(const uint64_t w)
1438 | {
1439 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1440 | }
1441 |
1442 | static double
1443 | get_ieee_double(const uint64_t w)
1444 | {
1445 | int64_t sign;
1446 | int64_t exponent;
1447 | int64_t mantissa;
1448 |
1449 | sign = w & IEEE_DP_SIGN_MASK;
1450 | exponent = w & IEEE_DP_EXPONENT_MASK;
1451 | mantissa = w & IEEE_DP_MANTISSA_MASK;
1452 |
1453 | if (ieee_double_is_zero(w)) {
1454 | /* number is zero, unnormalized, or not-a-number */
1455 | return 0.0;
1456 | }
1457 | #if 0
1458 | /*
1459 | * XXX - how to handle this?
1460 | */
1461 | if (IEEE_DP_INFINITY == exponent) {
1462 | /*
1463 | * number is positive or negative infinity, or a special value
1464 | */
1465 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1466 | }
1467 | #endif
1468 |
1469 | exponent = ((exponent >> IEEE_DP_MANTISSA_WIDTH) - IEEE_DP_BIAS) -
1470 | IEEE_DP_MANTISSA_WIDTH;
1471 | mantissa |= IEEE_DP_IMPLIED_BIT;
1472 |
1473 | if (sign)
1474 | return -mantissa * pow(2, exponent);
1475 | else
1476 | return mantissa * pow(2, exponent);
1477 | }
1478 | #endif
1479 |
1480 | /*
1481 | * Fetches an IEEE single-precision floating-point number, in
1482 | * big-endian form, and returns a "float".
1483 | *
1484 | * XXX - should this be "double", in case there are IEEE single-
1485 | * precision numbers that won't fit in some platform's native
1486 | * "float" format?
1487 | */
1488 | float
1489 | tvb_get_ntohieee_float(tvbuff_t *tvb, const int offset)
1490 | {
1491 | #if defined(vax)
1492 | return get_ieee_float(tvb_get_ntohl(tvb, offset));
1493 | #else
1494 | union {
1495 | float f;
1496 | uint32_t w;
1497 | } ieee_fp_union;
1498 |
1499 | ieee_fp_union.w = tvb_get_ntohl(tvb, offset);
1500 | return ieee_fp_union.f;
1501 | #endif
1502 | }
1503 |
1504 | /*
1505 | * Fetches an IEEE double-precision floating-point number, in
1506 | * big-endian form, and returns a "double".
1507 | */
1508 | double
1509 | tvb_get_ntohieee_double(tvbuff_t *tvb, const int offset)
1510 | {
1511 | #if defined(vax)
1512 | union {
1513 | uint32_t w[2];
1514 | uint64_t dw;
1515 | } ieee_fp_union;
1516 | #else
1517 | union {
1518 | double d;
1519 | uint32_t w[2];
1520 | } ieee_fp_union;
1521 | #endif
1522 |
1523 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1524 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset);
1525 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset+4);
1526 | #else
1527 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset+4);
1528 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset);
1529 | #endif
1530 | #if defined(vax)
1531 | return get_ieee_double(ieee_fp_union.dw);
1532 | #else
1533 | return ieee_fp_union.d;
1534 | #endif
1535 | }
1536 |
1537 | uint16_t
1538 | tvb_get_letohs(tvbuff_t *tvb, const int offset)
1539 | {
1540 | const uint8_t *ptr;
1541 |
1542 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1543 | return pletohu16(ptr);
1544 | }
1545 |
1546 | int16_t
1547 | tvb_get_letohis(tvbuff_t *tvb, const int offset)
1548 | {
1549 | const uint8_t *ptr;
1550 |
1551 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1552 | return pletohu16(ptr);
1553 | }
1554 |
1555 | uint32_t
1556 | tvb_get_letoh24(tvbuff_t *tvb, const int offset)
1557 | {
1558 | const uint8_t *ptr;
1559 |
1560 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1561 | return pletohu24(ptr);
1562 | }
1563 |
1564 | int32_t
1565 | tvb_get_letohi24(tvbuff_t *tvb, const int offset)
1566 | {
1567 | uint32_t ret;
1568 |
1569 | ret = ws_sign_ext32(tvb_get_letoh24(tvb, offset), 24);
1570 |
1571 | return (int32_t)ret;
1572 | }
1573 |
1574 | uint32_t
1575 | tvb_get_letohl(tvbuff_t *tvb, const int offset)
1576 | {
1577 | const uint8_t *ptr;
1578 |
1579 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1580 | return pletohu32(ptr);
1581 | }
1582 |
1583 | int32_t
1584 | tvb_get_letohil(tvbuff_t *tvb, const int offset)
1585 | {
1586 | const uint8_t *ptr;
1587 |
1588 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1589 | return pletohu32(ptr);
1590 | }
1591 |
1592 | uint64_t
1593 | tvb_get_letoh40(tvbuff_t *tvb, const int offset)
1594 | {
1595 | const uint8_t *ptr;
1596 |
1597 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1598 | return pletohu40(ptr);
1599 | }
1600 |
1601 | int64_t
1602 | tvb_get_letohi40(tvbuff_t *tvb, const int offset)
1603 | {
1604 | uint64_t ret;
1605 |
1606 | ret = ws_sign_ext64(tvb_get_letoh40(tvb, offset), 40);
1607 |
1608 | return (int64_t)ret;
1609 | }
1610 |
1611 | uint64_t
1612 | tvb_get_letoh48(tvbuff_t *tvb, const int offset)
1613 | {
1614 | const uint8_t *ptr;
1615 |
1616 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1617 | return pletohu48(ptr);
1618 | }
1619 |
1620 | int64_t
1621 | tvb_get_letohi48(tvbuff_t *tvb, const int offset)
1622 | {
1623 | uint64_t ret;
1624 |
1625 | ret = ws_sign_ext64(tvb_get_letoh48(tvb, offset), 48);
1626 |
1627 | return (int64_t)ret;
1628 | }
1629 |
1630 | uint64_t
1631 | tvb_get_letoh56(tvbuff_t *tvb, const int offset)
1632 | {
1633 | const uint8_t *ptr;
1634 |
1635 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1636 | return pletohu56(ptr);
1637 | }
1638 |
1639 | int64_t
1640 | tvb_get_letohi56(tvbuff_t *tvb, const int offset)
1641 | {
1642 | uint64_t ret;
1643 |
1644 | ret = ws_sign_ext64(tvb_get_letoh56(tvb, offset), 56);
1645 |
1646 | return (int64_t)ret;
1647 | }
1648 |
1649 | uint64_t
1650 | tvb_get_letoh64(tvbuff_t *tvb, const int offset)
1651 | {
1652 | const uint8_t *ptr;
1653 |
1654 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1655 | return pletohu64(ptr);
1656 | }
1657 |
1658 | int64_t
1659 | tvb_get_letohi64(tvbuff_t *tvb, const int offset)
1660 | {
1661 | const uint8_t *ptr;
1662 |
1663 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1664 | return pletohu64(ptr);
1665 | }
1666 |
1667 | /*
1668 | * Fetches an IEEE single-precision floating-point number, in
1669 | * little-endian form, and returns a "float".
1670 | *
1671 | * XXX - should this be "double", in case there are IEEE single-
1672 | * precision numbers that won't fit in some platform's native
1673 | * "float" format?
1674 | */
1675 | float
1676 | tvb_get_letohieee_float(tvbuff_t *tvb, const int offset)
1677 | {
1678 | #if defined(vax)
1679 | return get_ieee_float(tvb_get_letohl(tvb, offset));
1680 | #else
1681 | union {
1682 | float f;
1683 | uint32_t w;
1684 | } ieee_fp_union;
1685 |
1686 | ieee_fp_union.w = tvb_get_letohl(tvb, offset);
1687 | return ieee_fp_union.f;
1688 | #endif
1689 | }
1690 |
1691 | /*
1692 | * Fetches an IEEE double-precision floating-point number, in
1693 | * little-endian form, and returns a "double".
1694 | */
1695 | double
1696 | tvb_get_letohieee_double(tvbuff_t *tvb, const int offset)
1697 | {
1698 | #if defined(vax)
1699 | union {
1700 | uint32_t w[2];
1701 | uint64_t dw;
1702 | } ieee_fp_union;
1703 | #else
1704 | union {
1705 | double d;
1706 | uint32_t w[2];
1707 | } ieee_fp_union;
1708 | #endif
1709 |
1710 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1711 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset+4);
1712 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset);
1713 | #else
1714 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset);
1715 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset+4);
1716 | #endif
1717 | #if defined(vax)
1718 | return get_ieee_double(ieee_fp_union.dw);
1719 | #else
1720 | return ieee_fp_union.d;
1721 | #endif
1722 | }
1723 |
1724 | /* This function is a slight misnomer. It accepts all encodings that are
1725 | * ASCII "enough", which means encodings that are the same as US-ASCII
1726 | * for textual representations of dates and hex bytes; i.e., the same
1727 | * for the hex digits and Z (in practice, all alphanumerics), and the
1728 | * four separators ':' '-' '.' and ' '
1729 | * That means that any encoding that keeps the ISO/IEC 646 invariant
1730 | * characters the same (including the T.61 8 bit encoding and multibyte
1731 | * encodings like EUC-KR and GB18030) are OK, even if they replace characters
1732 | * like '$' '#' and '\' with national variants, but not encodings like UTF-16
1733 | * that include extra null bytes.
1734 | * For our current purposes, the unpacked GSM 7-bit default alphabet (but not
1735 | * all National Language Shift Tables) also satisfies this requirement, but
1736 | * note that it does *not* keep all ISO/IEC 646 invariant characters the same.
1737 | * If this internal function gets used for additional purposes than currently,
1738 | * the set of encodings that it accepts could change.
1739 | * */
1740 | static inline void
1741 | validate_single_byte_ascii_encoding(const unsigned encoding)
1742 | {
1743 | const unsigned enc = encoding & ~ENC_CHARENCODING_MASK0x0000FFFE;
1744 |
1745 | switch (enc) {
1746 | case ENC_UTF_160x00000004:
1747 | case ENC_UCS_20x00000006:
1748 | case ENC_UCS_40x00000008:
1749 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
1750 | case ENC_ASCII_7BITS0x00000034:
1751 | case ENC_EBCDIC0x0000002E:
1752 | case ENC_EBCDIC_CP0370x00000038:
1753 | case ENC_EBCDIC_CP5000x00000060:
1754 | case ENC_BCD_DIGITS_0_90x00000044:
1755 | case ENC_KEYPAD_ABC_TBCD0x00000046:
1756 | case ENC_KEYPAD_BC_TBCD0x00000048:
1757 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
1758 | case ENC_APN_STR0x00000054:
1759 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
1760 | 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" );
1761 | break;
1762 | default:
1763 | break;
1764 | }
1765 | /* make sure something valid was set */
1766 | if (enc == 0)
1767 | 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" );
1768 | }
1769 |
1770 | GByteArray*
1771 | tvb_get_string_bytes(tvbuff_t *tvb, const int offset, const int length,
1772 | const unsigned encoding, GByteArray *bytes, int *endoff)
1773 | {
1774 | char *ptr;
1775 | const char *begin;
1776 | const char *end = NULL((void*)0);
1777 | GByteArray *retval = NULL((void*)0);
1778 |
1779 | validate_single_byte_ascii_encoding(encoding);
1780 |
1781 | ptr = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1782 | begin = ptr;
1783 |
1784 | if (endoff) *endoff = offset;
1785 |
1786 | while (*begin == ' ') begin++;
1787 |
1788 | if (*begin && bytes) {
1789 | if (hex_str_to_bytes_encoding(begin, bytes, &end, encoding, false0)) {
1790 | if (bytes->len > 0) {
1791 | if (endoff) *endoff = offset + (int)(end - ptr);
1792 | retval = bytes;
1793 | }
1794 | }
1795 | }
1796 |
1797 | wmem_free(NULL((void*)0), ptr);
1798 |
1799 | return retval;
1800 | }
1801 |
1802 | static bool_Bool
1803 | parse_month_name(const char *name, int *tm_mon)
1804 | {
1805 | static const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May",
1806 | "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1807 | for (int i = 0; i < 12; i++) {
1808 | if (memcmp(months[i], name, 4) == 0) {
1809 | *tm_mon = i;
1810 | return true1;
1811 | }
1812 | }
1813 | return false0;
1814 | }
1815 |
1816 | /*
1817 | * Is the character a WSP character, as per RFC 5234? (space or tab).
1818 | */
1819 | #define IS_WSP(c)((c) == ' ' || (c) == '\t') ((c) == ' ' || (c) == '\t')
1820 |
1821 | /* support hex-encoded time values? */
1822 | nstime_t*
1823 | tvb_get_string_time(tvbuff_t *tvb, const int offset, const int length,
1824 | const unsigned encoding, nstime_t *ns, int *endoff)
1825 | {
1826 | char *begin;
1827 | const char *ptr;
1828 | const char *end = NULL((void*)0);
1829 | int num_chars = 0;
1830 | int utc_offset = 0;
1831 |
1832 | validate_single_byte_ascii_encoding(encoding);
1833 |
1834 | DISSECTOR_ASSERT(ns)((void) ((ns) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 1834, "ns"))));
1835 |
1836 | begin = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1837 | ptr = begin;
1838 |
1839 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
1840 | ptr++;
1841 |
1842 | if (*ptr) {
1843 | if ((encoding & ENC_ISO_8601_DATE_TIME0x00030000) == ENC_ISO_8601_DATE_TIME0x00030000) {
1844 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME))) {
1845 |
1846 |
1847 | goto fail;
1848 | }
1849 | } else if ((encoding & ENC_ISO_8601_DATE_TIME_BASIC0x00100000) == ENC_ISO_8601_DATE_TIME_BASIC0x00100000) {
1850 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME_BASIC))) {
1851 |
1852 |
1853 | goto fail;
1854 | }
1855 | } else {
1856 | struct tm tm;
1857 |
1858 | memset(&tm, 0, sizeof(tm));
1859 | tm.tm_isdst = -1;
1860 | ns->secs = 0;
1861 | ns->nsecs = 0;
1862 |
1863 | /* note: sscanf is known to be inconsistent across platforms with respect
1864 | to whether a %n is counted as a return value or not, so we have to use
1865 | '>=' a lot */
1866 | if (encoding & ENC_ISO_8601_DATE0x00010000) {
1867 | /* 2014-04-07 */
1868 | if (sscanf(ptr, "%d-%d-%d%n",
1869 | &tm.tm_year,
1870 | &tm.tm_mon,
1871 | &tm.tm_mday,
1872 | &num_chars) >= 3)
1873 | {
1874 | end = ptr + num_chars;
1875 | tm.tm_mon--;
1876 | if (tm.tm_year > 1900) tm.tm_year -= 1900;
1877 | } else {
1878 | goto fail;
1879 | }
1880 | }
1881 | else if (encoding & ENC_ISO_8601_TIME0x00020000) {
1882 | /* 2014-04-07 */
1883 | if (sscanf(ptr, "%d:%d:%d%n",
1884 | &tm.tm_hour,
1885 | &tm.tm_min,
1886 | &tm.tm_sec,
1887 | &num_chars) >= 2)
1888 | {
1889 | /* what should we do about day/month/year? */
1890 | /* setting it to "now" for now */
1891 | time_t time_now = time(NULL((void*)0));
1892 | struct tm *tm_now = gmtime(&time_now);
1893 | if (tm_now != NULL((void*)0)) {
1894 | tm.tm_year = tm_now->tm_year;
1895 | tm.tm_mon = tm_now->tm_mon;
1896 | tm.tm_mday = tm_now->tm_mday;
1897 | } else {
1898 | /* The second before the Epoch */
1899 | tm.tm_year = 69;
1900 | tm.tm_mon = 12;
1901 | tm.tm_mday = 31;
1902 | }
1903 | end = ptr + num_chars;
1904 | } else {
1905 | goto fail;
1906 | }
1907 | }
1908 | else if (encoding & ENC_IMF_DATE_TIME0x00040000) {
1909 | /*
1910 | * Match [dow,] day month year hh:mm[:ss] with
1911 | * two-digit years (RFC 822) or four-digit
1912 | * years (RFCs 1123, 2822, 5822). Skip
1913 | * the day of week since it is locale
1914 | * dependent and does not affect the resulting
1915 | * date anyway.
1916 | */
1917 | 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] == ',')
1918 | ptr += 4; /* Skip day of week. */
1919 |
1920 | /*
1921 | * Parse the day-of-month and month
1922 | * name.
1923 | */
1924 | char month_name[4] = { 0 };
1925 |
1926 | if (sscanf(ptr, "%d %3s%n",
1927 | &tm.tm_mday,
1928 | month_name,
1929 | &num_chars) < 2)
1930 | {
1931 | /* Not matched. */
1932 | goto fail;
1933 | }
1934 | if (!parse_month_name(month_name, &tm.tm_mon)) {
1935 | goto fail;
1936 | }
1937 | ptr += num_chars;
1938 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
1939 | ptr++;
1940 |
1941 | /*
1942 | * Scan the year. Treat 2-digit years
1943 | * differently from 4-digit years.
1944 | */
1945 | uint32_t year;
1946 | const char *yearendp;
1947 |
1948 | if (!ws_strtou32(ptr, &yearendp, &year)) {
1949 | goto fail;
1950 | }
1951 | if (!IS_WSP(*yearendp)((*yearendp) == ' ' || (*yearendp) == '\t')) {
1952 | /* Not followed by WSP. */
1953 | goto fail;
1954 | }
1955 | if (yearendp - ptr < 2) {
1956 | /* 1-digit year. Error. */
1957 | goto fail;
1958 | }
1959 | if (yearendp - ptr == 2) {
1960 | /*
1961 | * 2-digit year.
1962 | *
1963 | * Match RFC 2822/RFC 5322 behavior;
1964 | * add 2000 to years from 0 to
1965 | * 49 and 1900 to uears from 50
1966 | * to 99.
1967 | */
1968 | if (year <= 49) {
1969 | year += 2000;
1970 | } else {
1971 | year += 1900;
1972 | }
1973 | } else if (yearendp - ptr == 3) {
1974 | /*
1975 | * 3-digit year.
1976 | *
1977 | * Match RFC 2822/RFC 5322 behavior;
1978 | * add 1900 to the year.
1979 | */
1980 | year += 1900;
1981 | }
1982 | tm.tm_year = year - 1900;
1983 | ptr = yearendp;
1984 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
1985 | ptr++;
1986 |
1987 | /* Parse the time. */
1988 | if (sscanf(ptr, "%d:%d%n:%d%n",
1989 | &tm.tm_hour,
1990 | &tm.tm_min,
1991 | &num_chars,
1992 | &tm.tm_sec,
1993 | &num_chars) < 2)
1994 | {
1995 | goto fail;
1996 | }
1997 | ptr += num_chars;
1998 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
1999 | ptr++;
2000 |
2001 | /*
2002 | * Parse the time zone.
2003 | * Check for obs-zone values first.
2004 | */
2005 | if (g_ascii_strncasecmp(ptr, "UT", 2) == 0)
2006 | {
2007 | ptr += 2;
2008 | }
2009 | else if (g_ascii_strncasecmp(ptr, "GMT", 3) == 0)
2010 | {
2011 | ptr += 3;
2012 | }
2013 | else
2014 | {
2015 | char sign;
2016 | int off_hr;
2017 | int off_min;
2018 |
2019 | if (sscanf(ptr, "%c%2d%2d%n",
2020 | &sign,
2021 | &off_hr,
2022 | &off_min,
2023 | &num_chars) < 3)
2024 | {
2025 | goto fail;
2026 | }
2027 |
2028 | /*
2029 | * If sign is '+', there's a positive
2030 | * UTC offset.
2031 | *
2032 | * If sign is '-', there's a negative
2033 | * UTC offset.
2034 | *
2035 | * Otherwise, that's an invalid UTC
2036 | * offset string.
2037 | */
2038 | if (sign == '+')
2039 | utc_offset += (off_hr * 3600) + (off_min * 60);
2040 | else if (sign == '-')
2041 | utc_offset -= (off_hr * 3600) + (off_min * 60);
2042 | else {
2043 | /* Sign must be + or - */
2044 | goto fail;
2045 | }
2046 | ptr += num_chars;
2047 | }
2048 | end = ptr;
2049 | }
2050 | ns->secs = mktime_utc(&tm);
2051 | if (ns->secs == (time_t)-1 && errno(*__errno_location ()) != 0) {
2052 | goto fail;
2053 | }
2054 | ns->secs += utc_offset;
2055 | }
2056 | } else {
2057 | /* Empty string */
2058 | goto fail;
2059 | }
2060 |
2061 | if (endoff)
2062 | *endoff = (int)(offset + (end - begin));
2063 | wmem_free(NULL((void*)0), begin);
2064 | return ns;
2065 |
2066 | fail:
2067 | wmem_free(NULL((void*)0), begin);
2068 | return NULL((void*)0);
2069 | }
2070 |
2071 | /* Fetch an IPv4 address, in network byte order.
2072 | * We do *not* convert them to host byte order; we leave them in
2073 | * network byte order. */
2074 | uint32_t
2075 | tvb_get_ipv4(tvbuff_t *tvb, const int offset)
2076 | {
2077 | const uint8_t *ptr;
2078 | uint32_t addr;
2079 |
2080 | ptr = fast_ensure_contiguous(tvb, offset, sizeof(uint32_t));
2081 | memcpy(&addr, ptr, sizeof addr);
2082 | return addr;
2083 | }
2084 |
2085 | /* Fetch an IPv6 address. */
2086 | void
2087 | tvb_get_ipv6(tvbuff_t *tvb, const int offset, ws_in6_addr *addr)
2088 | {
2089 | const uint8_t *ptr;
2090 |
2091 | ptr = ensure_contiguous(tvb, offset, sizeof(*addr));
2092 | memcpy(addr, ptr, sizeof *addr);
2093 | }
2094 |
2095 | /*
2096 | * These routines return the length of the address in bytes on success
2097 | * and -1 if the prefix length is too long.
2098 | */
2099 | int
2100 | tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in4_addr *addr,
2101 | uint32_t prefix_len)
2102 | {
2103 | uint8_t addr_len;
2104 |
2105 | if (prefix_len > 32)
2106 | return -1;
2107 |
2108 | addr_len = (prefix_len + 7) / 8;
2109 | *addr = 0;
2110 | tvb_memcpy(tvb, addr, offset, addr_len);
2111 | if (prefix_len % 8)
2112 | ((uint8_t*)addr)[addr_len - 1] &= ((0xff00 >> (prefix_len % 8)) & 0xff);
2113 | return addr_len;
2114 | }
2115 |
2116 | /*
2117 | * These routines return the length of the address in bytes on success
2118 | * and -1 if the prefix length is too long.
2119 | */
2120 | int
2121 | tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in6_addr *addr,
2122 | uint32_t prefix_len)
2123 | {
2124 | uint32_t addr_len;
2125 |
2126 | if (prefix_len > 128)
2127 | return -1;
2128 |
2129 | addr_len = (prefix_len + 7) / 8;
2130 | memset(addr->bytes, 0, 16);
2131 | tvb_memcpy(tvb, addr->bytes, offset, addr_len);
2132 | if (prefix_len % 8) {
2133 | addr->bytes[addr_len - 1] &=
2134 | ((0xff00 >> (prefix_len % 8)) & 0xff);
2135 | }
2136 |
2137 | return addr_len;
2138 | }
2139 |
2140 | /* Fetch a GUID. */
2141 | void
2142 | tvb_get_ntohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid)
2143 | {
2144 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16);
2145 |
2146 | guid->data1 = pntohu32(ptr + 0);
2147 | guid->data2 = pntohu16(ptr + 4);
2148 | guid->data3 = pntohu16(ptr + 6);
2149 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2150 | }
2151 |
2152 | void
2153 | tvb_get_letohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid)
2154 | {
2155 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16);
2156 |
2157 | guid->data1 = pletohu32(ptr + 0);
2158 | guid->data2 = pletohu16(ptr + 4);
2159 | guid->data3 = pletohu16(ptr + 6);
2160 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2161 | }
2162 |
2163 | void
2164 | tvb_get_guid(tvbuff_t *tvb, const int offset, e_guid_t *guid, const unsigned encoding)
2165 | {
2166 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2167 | tvb_get_letohguid(tvb, offset, guid);
2168 | } else {
2169 | tvb_get_ntohguid(tvb, offset, guid);
2170 | }
2171 | }
2172 |
2173 | static const uint8_t bit_mask8[] = {
2174 | 0x00,
2175 | 0x01,
2176 | 0x03,
2177 | 0x07,
2178 | 0x0f,
2179 | 0x1f,
2180 | 0x3f,
2181 | 0x7f,
2182 | 0xff
2183 | };
2184 |
2185 |
2186 | /* Get a variable amount of bits
2187 | *
2188 | * Return a byte array with bit limited data.
2189 | * When encoding is ENC_BIG_ENDIAN, the data is aligned to the left.
2190 | * When encoding is ENC_LITTLE_ENDIAN, the data is aligned to the right.
2191 | */
2192 | uint8_t *
2193 | tvb_get_bits_array(wmem_allocator_t *scope, tvbuff_t *tvb, const int bit_offset,
2194 | size_t no_of_bits, size_t *data_length, const unsigned encoding)
2195 | {
2196 | tvbuff_t *sub_tvb;
2197 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2198 | sub_tvb = tvb_new_octet_right_aligned(tvb, bit_offset, (int32_t) no_of_bits);
2199 | } else {
2200 | sub_tvb = tvb_new_octet_aligned(tvb, bit_offset, (int32_t) no_of_bits);
2201 | }
2202 | *data_length = tvb_reported_length(sub_tvb);
2203 | return (uint8_t*)tvb_memdup(scope, sub_tvb, 0, *data_length);
2204 | }
2205 |
2206 | /* Get 1 - 8 bits */
2207 | uint8_t
2208 | tvb_get_bits8(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits)
2209 | {
2210 | 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", 2210 , "no_of_bits <= 8", "Too many bits requested for 8-bit return type" ))));
2211 | return (uint8_t)_tvb_get_bits64(tvb, bit_offset, no_of_bits);
2212 | }
2213 |
2214 | /* Get 1 - 16 bits */
2215 | uint16_t
2216 | tvb_get_bits16(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2217 | {
2218 | 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", 2218 , "no_of_bits <= 16", "Too many bits requested for 16-bit return type" ))));
2219 | return (uint16_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2220 | }
2221 |
2222 | /* Get 1 - 32 bits */
2223 | uint32_t
2224 | tvb_get_bits32(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2225 | {
2226 | 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", 2226 , "no_of_bits <= 32", "Too many bits requested for 32-bit return type" ))));
2227 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2228 | }
2229 |
2230 | /* Get 1 - 64 bits */
2231 | uint64_t
2232 | tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2233 | {
2234 | 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", 2234 , "no_of_bits <= 64", "Too many bits requested for 64-bit return type" ))));
2235 |
2236 | /* encoding determines bit numbering within octet array */
2237 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2238 | return _tvb_get_bits64_le(tvb, bit_offset, no_of_bits);
2239 | } else {
2240 | return _tvb_get_bits64(tvb, bit_offset, no_of_bits);
2241 | }
2242 | }
2243 |
2244 | /*
2245 | * This function will dissect a sequence of bits that does not need to be byte aligned; the bits
2246 | * set will be shown in the tree as ..10 10.. and the integer value returned if return_value is set.
2247 | * Offset should be given in bits from the start of the tvb.
2248 | * Bits within octet are numbered from MSB (0) to LSB (7). Bit at bit_offset is return value most significant bit.
2249 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2250 | */
2251 | static uint64_t
2252 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits)
2253 | {
2254 | uint64_t value;
2255 | unsigned octet_offset = bit_offset >> 3;
2256 | uint8_t required_bits_in_first_octet = 8 - (bit_offset % 8);
2257 |
2258 | if(required_bits_in_first_octet > total_no_of_bits)
2259 | {
2260 | /* the required bits don't extend to the end of the first octet */
2261 | uint8_t right_shift = required_bits_in_first_octet - total_no_of_bits;
2262 | value = (tvb_get_uint8(tvb, octet_offset) >> right_shift) & bit_mask8[total_no_of_bits % 8];
2263 | }
2264 | else
2265 | {
2266 | uint8_t remaining_bit_length = total_no_of_bits;
2267 |
2268 | /* get the bits up to the first octet boundary */
2269 | value = 0;
2270 | required_bits_in_first_octet %= 8;
2271 | if(required_bits_in_first_octet != 0)
2272 | {
2273 | value = tvb_get_uint8(tvb, octet_offset) & bit_mask8[required_bits_in_first_octet];
2274 | remaining_bit_length -= required_bits_in_first_octet;
2275 | octet_offset ++;
2276 | }
2277 | /* take the biggest words, shorts or octets that we can */
2278 | while (remaining_bit_length > 7)
2279 | {
2280 | switch (remaining_bit_length >> 4)
2281 | {
2282 | case 0:
2283 | /* 8 - 15 bits. (note that 0 - 7 would have dropped out of the while() loop) */
2284 | value <<= 8;
2285 | value += tvb_get_uint8(tvb, octet_offset);
2286 | remaining_bit_length -= 8;
2287 | octet_offset ++;
2288 | break;
2289 |
2290 | case 1:
2291 | /* 16 - 31 bits */
2292 | value <<= 16;
2293 | value += tvb_get_ntohs(tvb, octet_offset);
2294 | remaining_bit_length -= 16;
2295 | octet_offset += 2;
2296 | break;
2297 |
2298 | case 2:
2299 | case 3:
2300 | /* 32 - 63 bits */
2301 | value <<= 32;
2302 | value += tvb_get_ntohl(tvb, octet_offset);
2303 | remaining_bit_length -= 32;
2304 | octet_offset += 4;
2305 | break;
2306 |
2307 | default:
2308 | /* 64 bits (or more???) */
2309 | value = tvb_get_ntoh64(tvb, octet_offset);
2310 | remaining_bit_length -= 64;
2311 | octet_offset += 8;
2312 | break;
2313 | }
2314 | }
2315 | /* get bits from any partial octet at the tail */
2316 | if(remaining_bit_length)
2317 | {
2318 | value <<= remaining_bit_length;
2319 | value += (tvb_get_uint8(tvb, octet_offset) >> (8 - remaining_bit_length));
2320 | }
2321 | }
2322 | return value;
2323 | }
2324 |
2325 | /*
2326 | * Offset should be given in bits from the start of the tvb.
2327 | * Bits within octet are numbered from LSB (0) to MSB (7). Bit at bit_offset is return value least significant bit.
2328 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2329 | */
2330 | static uint64_t
2331 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits)
2332 | {
2333 | uint64_t value = 0;
2334 | unsigned octet_offset = bit_offset / 8;
2335 | int remaining_bits = total_no_of_bits;
2336 | int shift = 0;
2337 |
2338 | if (remaining_bits > 64)
2339 | {
2340 | remaining_bits = 64;
2341 | }
2342 |
2343 | if (bit_offset % 8)
2344 | {
2345 | /* not aligned, extract bits from first octet */
2346 | shift = 8 - (bit_offset % 8);
2347 | value = tvb_get_uint8(tvb, octet_offset) >> (bit_offset % 8);
2348 | if (shift > remaining_bits)
2349 | {
2350 | /* keep only the requested bits */
2351 | value &= (UINT64_C(1)1UL << remaining_bits) - 1;
2352 | remaining_bits = 0;
2353 | }
2354 | else
2355 | {
2356 | remaining_bits -= shift;
2357 | }
2358 | octet_offset++;
2359 | }
2360 |
2361 | while (remaining_bits > 0)
2362 | {
2363 | /* take the biggest words, shorts or octets that we can */
2364 | if (remaining_bits >= 32)
2365 | {
2366 | value |= ((uint64_t)tvb_get_letohl(tvb, octet_offset) << shift);
2367 | shift += 32;
2368 | remaining_bits -= 32;
2369 | octet_offset += 4;
2370 | }
2371 | else if (remaining_bits >= 16)
2372 | {
2373 | value |= ((uint64_t)tvb_get_letohs(tvb, octet_offset) << shift);
2374 | shift += 16;
2375 | remaining_bits -= 16;
2376 | octet_offset += 2;
2377 | }
2378 | else if (remaining_bits >= 8)
2379 | {
2380 | value |= ((uint64_t)tvb_get_uint8(tvb, octet_offset) << shift);
2381 | shift += 8;
2382 | remaining_bits -= 8;
2383 | octet_offset += 1;
2384 | }
2385 | else
2386 | {
2387 | unsigned mask = (1 << remaining_bits) - 1;
2388 | value |= (((uint64_t)tvb_get_uint8(tvb, octet_offset) & mask) << shift);
2389 | shift += remaining_bits;
2390 | remaining_bits = 0;
2391 | octet_offset += 1;
2392 | }
2393 | }
2394 | return value;
2395 | }
2396 |
2397 | /* Get 1 - 32 bits (should be deprecated as same as tvb_get_bits32??) */
2398 | uint32_t
2399 | tvb_get_bits(tvbuff_t *tvb, const unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2400 | {
2401 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2402 | }
2403 |
2404 | static int
2405 | tvb_find_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, uint8_t needle)
2406 | {
2407 | const uint8_t *ptr;
2408 | const uint8_t *result;
2409 |
2410 | ptr = ensure_contiguous(tvb, abs_offset, limit); /* tvb_get_ptr() */
2411 | if (!ptr)
2412 | return -1;
2413 |
2414 | result = (const uint8_t *) memchr(ptr, needle, limit);
2415 | if (!result)
2416 | return -1;
2417 |
2418 | return (int) ((result - ptr) + abs_offset);
2419 | }
2420 |
2421 | /* Find first occurrence of needle in tvbuff, starting at offset. Searches
2422 | * at most maxlength number of bytes; if maxlength is -1, searches to
2423 | * end of tvbuff.
2424 | * Returns the offset of the found needle, or -1 if not found.
2425 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2426 | * in that case, -1 will be returned if the boundary is reached before
2427 | * finding needle. */
2428 | int
2429 | tvb_find_uint8(tvbuff_t *tvb, const int offset, const int maxlength, const uint8_t needle)
2430 | {
2431 | const uint8_t *result;
2432 | unsigned abs_offset = 0;
2433 | unsigned limit = 0;
2434 | int exception;
2435 |
2436 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2436, "tvb && tvb->initialized" ))));
2437 |
2438 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit);
2439 | if (exception)
2440 | THROW(exception)except_throw(1, (exception), ((void*)0));
2441 |
2442 | /* Only search to end of tvbuff, w/o throwing exception. */
2443 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2444 | /* Maximum length doesn't go past end of tvbuff; search
2445 | to that value. */
2446 | limit = (unsigned) maxlength;
2447 | }
2448 |
2449 | /* If we have real data, perform our search now. */
2450 | if (tvb->real_data) {
2451 | result = (const uint8_t *)memchr(tvb->real_data + abs_offset, needle, limit);
2452 | if (result == NULL((void*)0)) {
2453 | return -1;
2454 | }
2455 | else {
2456 | return (int) (result - tvb->real_data);
2457 | }
2458 | }
2459 |
2460 | if (tvb->ops->tvb_find_uint8)
2461 | return tvb->ops->tvb_find_uint8(tvb, abs_offset, limit, needle);
2462 |
2463 | return tvb_find_uint8_generic(tvb, offset, limit, needle);
2464 | }
2465 |
2466 | /* Same as tvb_find_uint8() with 16bit needle. */
2467 | int
2468 | tvb_find_uint16(tvbuff_t *tvb, const int offset, const int maxlength,
2469 | const uint16_t needle)
2470 | {
2471 | unsigned abs_offset = 0;
2472 | unsigned limit = 0;
2473 | int exception;
2474 |
2475 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit);
2476 | if (exception)
2477 | THROW(exception)except_throw(1, (exception), ((void*)0));
2478 |
2479 | /* Only search to end of tvbuff, w/o throwing exception. */
2480 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2481 | /* Maximum length doesn't go past end of tvbuff; search
2482 | to that value. */
2483 | limit = (unsigned) maxlength;
2484 | }
2485 |
2486 | const uint8_t needle1 = ((needle & 0xFF00) >> 8);
2487 | const uint8_t needle2 = ((needle & 0x00FF) >> 0);
2488 | unsigned searched_bytes = 0;
2489 | unsigned pos = abs_offset;
2490 |
2491 | do {
2492 | int offset1 =
2493 | tvb_find_uint8(tvb, pos, limit - searched_bytes, needle1);
2494 | int offset2 = -1;
2495 |
2496 | if (offset1 == -1) {
2497 | return -1;
2498 | }
2499 |
2500 | searched_bytes = (unsigned)offset1 - abs_offset + 1;
2501 |
2502 | if (searched_bytes >= limit) {
2503 | return -1;
2504 | }
2505 |
2506 | offset2 = tvb_find_uint8(tvb, offset1 + 1, 1, needle2);
2507 |
2508 | searched_bytes += 1;
2509 |
2510 | if (offset2 != -1) {
2511 | if (searched_bytes > limit) {
2512 | return -1;
2513 | }
2514 | return offset1;
2515 | }
2516 |
2517 | pos = offset1 + 1;
2518 | } while (searched_bytes < limit);
2519 |
2520 | return -1;
2521 | }
2522 |
2523 | static inline int
2524 | tvb_ws_mempbrk_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, const ws_mempbrk_pattern* pattern, unsigned char *found_needle)
2525 | {
2526 | const uint8_t *ptr;
2527 | const uint8_t *result;
2528 |
2529 | ptr = ensure_contiguous(tvb, abs_offset, limit); /* tvb_get_ptr */
2530 | if (!ptr)
2531 | return -1;
2532 |
2533 | result = ws_mempbrk_exec(ptr, limit, pattern, found_needle);
2534 | if (!result)
2535 | return -1;
2536 |
2537 | return (int) ((result - ptr) + abs_offset);
2538 | }
2539 |
2540 |
2541 | /* Find first occurrence of any of the pattern chars in tvbuff, starting at offset.
2542 | * Searches at most maxlength number of bytes; if maxlength is -1, searches
2543 | * to end of tvbuff.
2544 | * Returns the offset of the found needle, or -1 if not found.
2545 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2546 | * in that case, -1 will be returned if the boundary is reached before
2547 | * finding needle. */
2548 | int
2549 | tvb_ws_mempbrk_pattern_uint8(tvbuff_t *tvb, const int offset, const int maxlength,
2550 | const ws_mempbrk_pattern* pattern, unsigned char *found_needle)
2551 | {
2552 | const uint8_t *result;
2553 | unsigned abs_offset = 0;
2554 | unsigned limit = 0;
2555 | int exception;
2556 |
2557 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2557, "tvb && tvb->initialized" ))));
2558 |
2559 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit);
2560 | if (exception)
2561 | THROW(exception)except_throw(1, (exception), ((void*)0));
2562 |
2563 | /* Only search to end of tvbuff, w/o throwing exception. */
2564 | if (limit > (unsigned) maxlength) {
2565 | /* Maximum length doesn't go past end of tvbuff; search
2566 | to that value. */
2567 | limit = maxlength;
2568 | }
2569 |
2570 | /* If we have real data, perform our search now. */
2571 | if (tvb->real_data) {
2572 | result = ws_mempbrk_exec(tvb->real_data + abs_offset, limit, pattern, found_needle);
2573 | if (result == NULL((void*)0)) {
2574 | return -1;
2575 | }
2576 | else {
2577 | return (int) (result - tvb->real_data);
2578 | }
2579 | }
2580 |
2581 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8)
2582 | return tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, abs_offset, limit, pattern, found_needle);
2583 |
2584 | return tvb_ws_mempbrk_uint8_generic(tvb, abs_offset, limit, pattern, found_needle);
2585 | }
2586 |
2587 | /* Find size of stringz (NUL-terminated string) by looking for terminating
2588 | * NUL. The size of the string includes the terminating NUL.
2589 | *
2590 | * If the NUL isn't found, it throws the appropriate exception.
2591 | */
2592 | unsigned
2593 | tvb_strsize(tvbuff_t *tvb, const int offset)
2594 | {
2595 | unsigned abs_offset = 0, junk_length;
2596 | int nul_offset;
2597 |
2598 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2598, "tvb && tvb->initialized" ))));
2599 |
2600 | check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
2601 | nul_offset = tvb_find_uint8(tvb, abs_offset, -1, 0);
2602 | if (nul_offset == -1) {
2603 | /*
2604 | * OK, we hit the end of the tvbuff, so we should throw
2605 | * an exception.
2606 | */
2607 | if (tvb->length < tvb->contained_length) {
2608 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
2609 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
2610 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
2611 | } else if (tvb->length < tvb->reported_length) {
2612 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
2613 | } else {
2614 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2615 | }
2616 | }
2617 | return (nul_offset - abs_offset) + 1;
2618 | }
2619 |
2620 | /* UTF-16/UCS-2 version of tvb_strsize */
2621 | /* Returns number of bytes including the (two-bytes) null terminator */
2622 | unsigned
2623 | tvb_unicode_strsize(tvbuff_t *tvb, const int offset)
2624 | {
2625 | unsigned i = 0;
2626 | gunichar2 uchar;
2627 |
2628 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2628, "tvb && tvb->initialized" ))));
2629 |
2630 | do {
2631 | /* Endianness doesn't matter when looking for null */
2632 | uchar = tvb_get_ntohs(tvb, offset + i);
2633 | i += 2;
2634 | } while(uchar != 0);
2635 |
2636 | return i;
2637 | }
2638 |
2639 | /* Find length of string by looking for end of string ('\0'), up to
2640 | * 'maxlength' characters'; if 'maxlength' is -1, searches to end
2641 | * of tvbuff.
2642 | * Returns -1 if 'maxlength' reached before finding EOS. */
2643 | int
2644 | tvb_strnlen(tvbuff_t *tvb, const int offset, const unsigned maxlength)
2645 | {
2646 | int result_offset;
2647 | unsigned abs_offset = 0, junk_length;
2648 |
2649 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2649, "tvb && tvb->initialized" ))));
2650 |
2651 | check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
2652 |
2653 | result_offset = tvb_find_uint8(tvb, abs_offset, maxlength, 0);
2654 |
2655 | if (result_offset == -1) {
2656 | return -1;
2657 | }
2658 | else {
2659 | return result_offset - abs_offset;
2660 | }
2661 | }
2662 |
2663 | /*
2664 | * Implement strneql etc
2665 | */
2666 |
2667 | /*
2668 | * Call strncmp after checking if enough chars left, returning 0 if
2669 | * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
2670 | */
2671 | int
2672 | tvb_strneql(tvbuff_t *tvb, const int offset, const char *str, const size_t size)
2673 | {
2674 | const uint8_t *ptr;
2675 |
2676 | ptr = ensure_contiguous_no_exception(tvb, offset, (int)size, NULL((void*)0));
2677 |
2678 | if (ptr) {
2679 | int cmp = strncmp((const char *)ptr, str, size);
2680 |
2681 | /*
2682 | * Return 0 if equal, -1 otherwise.
2683 | */
2684 | return (cmp == 0 ? 0 : -1);
2685 | } else {
2686 | /*
2687 | * Not enough characters in the tvbuff to match the
2688 | * string.
2689 | */
2690 | return -1;
2691 | }
2692 | }
2693 |
2694 | /*
2695 | * Call g_ascii_strncasecmp after checking if enough chars left, returning
2696 | * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
2697 | */
2698 | int
2699 | tvb_strncaseeql(tvbuff_t *tvb, const int offset, const char *str, const size_t size)
2700 | {
2701 | const uint8_t *ptr;
2702 |
2703 | ptr = ensure_contiguous_no_exception(tvb, offset, (int)size, NULL((void*)0));
2704 |
2705 | if (ptr) {
2706 | int cmp = g_ascii_strncasecmp((const char *)ptr, str, size);
2707 |
2708 | /*
2709 | * Return 0 if equal, -1 otherwise.
2710 | */
2711 | return (cmp == 0 ? 0 : -1);
2712 | } else {
2713 | /*
2714 | * Not enough characters in the tvbuff to match the
2715 | * string.
2716 | */
2717 | return -1;
2718 | }
2719 | }
2720 |
2721 | /*
2722 | * Check that the tvbuff contains at least size bytes, starting at
2723 | * offset, and that those bytes are equal to str. Return 0 for success
2724 | * and -1 for error. This function does not throw an exception.
2725 | */
2726 | int
2727 | tvb_memeql(tvbuff_t *tvb, const int offset, const uint8_t *str, size_t size)
2728 | {
2729 | const uint8_t *ptr;
2730 |
2731 | ptr = ensure_contiguous_no_exception(tvb, offset, (int) size, NULL((void*)0));
2732 |
2733 | if (ptr) {
2734 | int cmp = memcmp(ptr, str, size);
2735 |
2736 | /*
2737 | * Return 0 if equal, -1 otherwise.
2738 | */
2739 | return (cmp == 0 ? 0 : -1);
2740 | } else {
2741 | /*
2742 | * Not enough characters in the tvbuff to match the
2743 | * string.
2744 | */
2745 | return -1;
2746 | }
2747 | }
2748 |
2749 | /**
2750 | * Format the data in the tvb from offset for size.
2751 | */
2752 | char *
2753 | tvb_format_text(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int size)
2754 | {
2755 | const uint8_t *ptr;
2756 | int len;
2757 |
2758 | len = (size > 0) ? size : 0;
2759 |
2760 | ptr = ensure_contiguous(tvb, offset, size);
2761 | return format_text(scope, (const char*)ptr, len);
2762 | }
2763 |
2764 | /*
2765 | * Format the data in the tvb from offset for length ...
2766 | */
2767 | char *
2768 | tvb_format_text_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const int offset, const int size)
2769 | {
2770 | const uint8_t *ptr;
2771 | int len;
2772 |
2773 | len = (size > 0) ? size : 0;
2774 |
2775 | ptr = ensure_contiguous(tvb, offset, size);
2776 | return format_text_wsp(allocator, (const char*)ptr, len);
2777 | }
2778 |
2779 | /**
2780 | * Like "tvb_format_text()", but for null-padded strings; don't show
2781 | * the null padding characters as "\000".
2782 | */
2783 | char *
2784 | tvb_format_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int size)
2785 | {
2786 | const uint8_t *ptr, *p;
2787 | int len;
2788 | int stringlen;
2789 |
2790 | len = (size > 0) ? size : 0;
2791 |
2792 | ptr = ensure_contiguous(tvb, offset, size);
2793 | for (p = ptr, stringlen = 0; stringlen < len && *p != '\0'; p++, stringlen++)
2794 | ;
2795 | return format_text(scope, (const char*)ptr, stringlen);
2796 | }
2797 |
2798 | /*
2799 | * Like "tvb_format_text_wsp()", but for null-padded strings; don't show
2800 | * the null padding characters as "\000".
2801 | */
2802 | char *
2803 | tvb_format_stringzpad_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const int offset, const int size)
2804 | {
2805 | const uint8_t *ptr, *p;
2806 | int len;
2807 | int stringlen;
2808 |
2809 | len = (size > 0) ? size : 0;
2810 |
2811 | ptr = ensure_contiguous(tvb, offset, size);
2812 | for (p = ptr, stringlen = 0; stringlen < len && *p != '\0'; p++, stringlen++)
2813 | ;
2814 | return format_text_wsp(allocator, (const char*)ptr, stringlen);
2815 | }
2816 |
2817 | /*
2818 | * All string functions below take a scope as an argument.
2819 | *
2820 | *
2821 | * If scope is NULL, memory is allocated with g_malloc() and user must
2822 | * explicitly free it with g_free().
2823 | * If scope is not NULL, memory is allocated with the corresponding pool
2824 | * lifetime.
2825 | *
2826 | * All functions throw an exception if the tvbuff ends before the string
2827 | * does.
2828 | */
2829 |
2830 | /*
2831 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
2832 | * of bytes referred to by the tvbuff, offset, and length as an ASCII string,
2833 | * with all bytes with the high-order bit set being invalid, and return a
2834 | * pointer to a UTF-8 string, allocated using the wmem scope.
2835 | *
2836 | * Octets with the highest bit set will be converted to the Unicode
2837 | * REPLACEMENT CHARACTER.
2838 | */
2839 | static uint8_t *
2840 | tvb_get_ascii_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
2841 | {
2842 | const uint8_t *ptr;
2843 |
2844 | ptr = ensure_contiguous(tvb, offset, length);
2845 | return get_ascii_string(scope, ptr, length);
2846 | }
2847 |
2848 | /*
2849 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation table,
2850 | * treat the string of bytes referred to by the tvbuff, offset, and length
2851 | * as a string encoded using one octet per character, with octets with the
2852 | * high-order bit clear being mapped by the translation table to 2-byte
2853 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
2854 | * CHARACTER) and octets with the high-order bit set being mapped to
2855 | * REPLACEMENT CHARACTER, and return a pointer to a UTF-8 string,
2856 | * allocated using the wmem scope.
2857 | *
2858 | * Octets with the highest bit set will be converted to the Unicode
2859 | * REPLACEMENT CHARACTER.
2860 | */
2861 | static uint8_t *
2862 | tvb_get_iso_646_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[0x80])
2863 | {
2864 | const uint8_t *ptr;
2865 |
2866 | ptr = ensure_contiguous(tvb, offset, length);
2867 | return get_iso_646_string(scope, ptr, length, table);
2868 | }
2869 |
2870 | /*
2871 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
2872 | * of bytes referred to by the tvbuff, the offset. and the length as a UTF-8
2873 | * string, and return a pointer to a UTF-8 string, allocated using the wmem
2874 | * scope, with all ill-formed sequences replaced with the Unicode REPLACEMENT
2875 | * CHARACTER according to the recommended "best practices" given in the Unicode
2876 | * Standard and specified by W3C/WHATWG.
2877 | *
2878 | * Note that in conformance with the Unicode Standard, this treats three
2879 | * byte sequences corresponding to UTF-16 surrogate halves (paired or unpaired)
2880 | * and two byte overlong encodings of 7-bit ASCII characters as invalid and
2881 | * substitutes REPLACEMENT CHARACTER for them. Explicit support for nonstandard
2882 | * derivative encoding formats (e.g. CESU-8, Java Modified UTF-8, WTF-8) could
2883 | * be added later.
2884 | */
2885 | static uint8_t *
2886 | tvb_get_utf_8_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length)
2887 | {
2888 | const uint8_t *ptr;
2889 |
2890 | ptr = ensure_contiguous(tvb, offset, length);
2891 | return get_utf_8_string(scope, ptr, length);
2892 | }
2893 |
2894 | /*
2895 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
2896 | * of bytes referred to by the tvbuff, the offset, and the length as a
2897 | * raw string, and return a pointer to that string, allocated using the
2898 | * wmem scope. This means a null is appended at the end, but no replacement
2899 | * checking is done otherwise, unlike tvb_get_utf_8_string().
2900 | *
2901 | * Also, this one allows a length of -1 to mean get all, but does not
2902 | * allow a negative offset.
2903 | */
2904 | static inline uint8_t *
2905 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length)
2906 | {
2907 | uint8_t *strbuf;
2908 | int abs_length = length;
2909 |
2910 | DISSECTOR_ASSERT(offset >= 0)((void) ((offset >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2910, "offset >= 0" ))));
2911 | DISSECTOR_ASSERT(abs_length >= -1)((void) ((abs_length >= -1) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2911, "abs_length >= -1" ))));
2912 |
2913 | if (abs_length < 0)
2914 | abs_length = tvb->length - offset;
2915 |
2916 | tvb_ensure_bytes_exist(tvb, (unsigned)offset, abs_length);
2917 | strbuf = (uint8_t *)wmem_alloc(scope, abs_length + 1);
2918 | tvb_memcpy(tvb, strbuf, offset, abs_length);
2919 | strbuf[abs_length] = '\0';
2920 | return strbuf;
2921 | }
2922 |
2923 | /*
2924 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
2925 | * of bytes referred to by the tvbuff, the offset, and the length as an
2926 | * ISO 8859/1 string, and return a pointer to a UTF-8 string, allocated
2927 | * using the wmem scope.
2928 | */
2929 | static uint8_t *
2930 | tvb_get_string_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
2931 | {
2932 | const uint8_t *ptr;
2933 |
2934 | ptr = ensure_contiguous(tvb, offset, length);
2935 | return get_8859_1_string(scope, ptr, length);
2936 | }
2937 |
2938 | /*
2939 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
2940 | * table, treat the string of bytes referred to by the tvbuff, the offset,
2941 | * and the length as a string encoded using one octet per character, with
2942 | * octets with the high-order bit clear being ASCII and octets with the
2943 | * high-order bit set being mapped by the translation table to 2-byte
2944 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
2945 | * CHARACTER), and return a pointer to a UTF-8 string, allocated with the
2946 | * wmem scope.
2947 | */
2948 | static uint8_t *
2949 | tvb_get_string_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[0x80])
2950 | {
2951 | const uint8_t *ptr;
2952 |
2953 | ptr = ensure_contiguous(tvb, offset, length);
2954 | return get_unichar2_string(scope, ptr, length, table);
2955 | }
2956 |
2957 | /*
2958 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
2959 | * giving the byte order, treat the string of bytes referred to by the
2960 | * tvbuff, the offset, and the length as a UCS-2 encoded string in
2961 | * the byte order in question, containing characters from the Basic
2962 | * Multilingual Plane (plane 0) of Unicode, and return a pointer to a
2963 | * UTF-8 string, allocated with the wmem scope.
2964 | *
2965 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN.
2966 | *
2967 | * Specify length in bytes.
2968 | *
2969 | * XXX - should map lead and trail surrogate values to REPLACEMENT
2970 | * CHARACTERs (0xFFFD)?
2971 | * XXX - if there are an odd number of bytes, should put a
2972 | * REPLACEMENT CHARACTER at the end.
2973 | */
2974 | static uint8_t *
2975 | tvb_get_ucs_2_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding)
2976 | {
2977 | const uint8_t *ptr;
2978 |
2979 | ptr = ensure_contiguous(tvb, offset, length);
2980 | return get_ucs_2_string(scope, ptr, length, encoding);
2981 | }
2982 |
2983 | /*
2984 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
2985 | * giving the byte order, treat the string of bytes referred to by the
2986 | * tvbuff, the offset, and the length as a UTF-16 encoded string in
2987 | * the byte order in question, and return a pointer to a UTF-8 string,
2988 | * allocated with the wmem scope.
2989 | *
2990 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN.
2991 | *
2992 | * Specify length in bytes.
2993 | *
2994 | * XXX - should map surrogate errors to REPLACEMENT CHARACTERs (0xFFFD).
2995 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
2996 | * XXX - if there are an odd number of bytes, should put a
2997 | * REPLACEMENT CHARACTER at the end.
2998 | */
2999 | static uint8_t *
3000 | tvb_get_utf_16_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding)
3001 | {
3002 | const uint8_t *ptr;
3003 |
3004 | ptr = ensure_contiguous(tvb, offset, length);
3005 | return get_utf_16_string(scope, ptr, length, encoding);
3006 | }
3007 |
3008 | /*
3009 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3010 | * giving the byte order, treat the string of bytes referred to by the
3011 | * tvbuff, the offset, and the length as a UCS-4 encoded string in
3012 | * the byte order in question, and return a pointer to a UTF-8 string,
3013 | * allocated with the wmem scope.
3014 | *
3015 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN
3016 | *
3017 | * Specify length in bytes
3018 | *
3019 | * XXX - should map lead and trail surrogate values to a "substitute"
3020 | * UTF-8 character?
3021 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3022 | * XXX - if the number of bytes isn't a multiple of 4, should put a
3023 | * REPLACEMENT CHARACTER at the end.
3024 | */
3025 | static char *
3026 | tvb_get_ucs_4_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int length, const unsigned encoding)
3027 | {
3028 | const uint8_t *ptr;
3029 |
3030 | ptr = ensure_contiguous(tvb, offset, length);
3031 | return (char*)get_ucs_4_string(scope, ptr, length, encoding);
3032 | }
3033 |
3034 | char *
3035 | tvb_get_ts_23_038_7bits_string_packed(wmem_allocator_t *scope, tvbuff_t *tvb,
3036 | const int bit_offset, int no_of_chars)
3037 | {
3038 | int in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3039 | int length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3040 | const uint8_t *ptr;
3041 |
3042 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3042, "tvb && tvb->initialized" ))));
3043 |
3044 | ptr = ensure_contiguous(tvb, in_offset, length);
3045 | return (char*)get_ts_23_038_7bits_string_packed(scope, ptr, bit_offset, no_of_chars);
3046 | }
3047 |
3048 | char *
3049 | tvb_get_ts_23_038_7bits_string_unpacked(wmem_allocator_t *scope, tvbuff_t *tvb,
3050 | const int offset, int length)
3051 | {
3052 | const uint8_t *ptr;
3053 |
3054 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3054, "tvb && tvb->initialized" ))));
3055 |
3056 | ptr = ensure_contiguous(tvb, offset, length);
3057 | return (char*)get_ts_23_038_7bits_string_unpacked(scope, ptr, length);
3058 | }
3059 |
3060 | char *
3061 | tvb_get_etsi_ts_102_221_annex_a_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3062 | const int offset, int length)
3063 | {
3064 | const uint8_t *ptr;
3065 |
3066 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3066, "tvb && tvb->initialized" ))));
3067 |
3068 | ptr = ensure_contiguous(tvb, offset, length);
3069 | return (char*)get_etsi_ts_102_221_annex_a_string(scope, ptr, length);
3070 | }
3071 |
3072 | char *
3073 | tvb_get_ascii_7bits_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3074 | const int bit_offset, int no_of_chars)
3075 | {
3076 | int in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3077 | int length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3078 | const uint8_t *ptr;
3079 |
3080 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3080, "tvb && tvb->initialized" ))));
3081 |
3082 | ptr = ensure_contiguous(tvb, in_offset, length);
3083 | return (char*)get_ascii_7bits_string(scope, ptr, bit_offset, no_of_chars);
3084 | }
3085 |
3086 | /*
3087 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3088 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3089 | * and the length as a string encoded using one octet per character, with
3090 | * octets being mapped by the translation table to 2-byte Unicode Basic
3091 | * Multilingual Plane characters (including REPLACEMENT CHARACTER), and
3092 | * return a pointer to a UTF-8 string, allocated with the wmem scope.
3093 | */
3094 | static uint8_t *
3095 | tvb_get_nonascii_unichar2_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length, const gunichar2 table[256])
3096 | {
3097 | const uint8_t *ptr;
3098 |
3099 | ptr = ensure_contiguous(tvb, offset, length);
3100 | return get_nonascii_unichar2_string(scope, ptr, length, table);
3101 | }
3102 |
3103 | /*
3104 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3105 | * referred to by the tvbuff, offset, and length as a GB18030 encoded string,
3106 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3107 | * converted having substituted REPLACEMENT CHARACTER according to the
3108 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3109 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3110 | *
3111 | * As expected, this will also decode GBK and GB2312 strings.
3112 | */
3113 | static uint8_t *
3114 | tvb_get_gb18030_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
3115 | {
3116 | const uint8_t *ptr;
3117 |
3118 | ptr = ensure_contiguous(tvb, offset, length);
3119 | return get_gb18030_string(scope, ptr, length);
3120 | }
3121 |
3122 | /*
3123 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3124 | * referred to by the tvbuff, offset, and length as a EUC-KR encoded string,
3125 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3126 | * converted having substituted REPLACEMENT CHARACTER according to the
3127 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3128 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3129 | */
3130 | static uint8_t *
3131 | tvb_get_euc_kr_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
3132 | {
3133 | const uint8_t *ptr;
3134 |
3135 | ptr = ensure_contiguous(tvb, offset, length);
3136 | return get_euc_kr_string(scope, ptr, length);
3137 | }
3138 |
3139 | static uint8_t *
3140 | tvb_get_t61_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
3141 | {
3142 | const uint8_t *ptr;
3143 |
3144 | ptr = ensure_contiguous(tvb, offset, length);
3145 | return get_t61_string(scope, ptr, length);
3146 | }
3147 |
3148 | /*
3149 | * Encoding tables for BCD strings.
3150 | */
3151 | static const dgt_set_t Dgt0_9_bcd = {
3152 | {
3153 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3154 | '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?','?'
3155 | }
3156 | };
3157 |
3158 | static const dgt_set_t Dgt_keypad_abc_tbcd = {
3159 | {
3160 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3161 | '0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?'
3162 | }
3163 | };
3164 |
3165 | static const dgt_set_t Dgt_ansi_tbcd = {
3166 | {
3167 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3168 | '0','1','2','3','4','5','6','7','8','9','?','B','C','*','#','?'
3169 | }
3170 | };
3171 |
3172 | static const dgt_set_t Dgt_dect_standard_4bits_tbcd = {
3173 | {
3174 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3175 | '0','1','2','3','4','5','6','7','8','9','?',' ','?','?','?','?'
3176 | }
3177 | };
3178 |
3179 | static uint8_t *
3180 | tvb_get_apn_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset,
3181 | int length)
3182 | {
3183 | wmem_strbuf_t *str;
3184 |
3185 | /*
3186 | * This is a domain name.
3187 | *
3188 | * 3GPP TS 23.003, section 19.4.2 "Fully Qualified Domain Names
3189 | * (FQDNs)", subsection 19.4.2.1 "General", says:
3190 | *
3191 | * The encoding of any identifier used as part of a Fully
3192 | * Qualified Domain Name (FQDN) shall follow the Name Syntax
3193 | * defined in IETF RFC 2181 [18], IETF RFC 1035 [19] and
3194 | * IETF RFC 1123 [20]. An FQDN consists of one or more
3195 | * labels. Each label is coded as a one octet length field
3196 | * followed by that number of octets coded as 8 bit ASCII
3197 | * characters.
3198 | *
3199 | * so this does not appear to use full-blown DNS compression -
3200 | * the upper 2 bits of the length don't indicate that it's a
3201 | * pointer or an extended label (RFC 2673).
3202 | */
3203 | str = wmem_strbuf_new_sized(scope, length + 1);
3204 | if (length > 0) {
3205 | const uint8_t *ptr;
3206 |
3207 | ptr = ensure_contiguous(tvb, offset, length);
3208 |
3209 | for (;;) {
3210 | unsigned label_len;
3211 |
3212 | /*
3213 | * Process this label.
3214 | */
3215 | label_len = *ptr;
3216 | ptr++;
3217 | length--;
3218 |
3219 | while (label_len != 0) {
3220 | uint8_t ch;
3221 |
3222 | if (length == 0)
3223 | goto end;
3224 |
3225 | ch = *ptr;
3226 | if (ch < 0x80)
3227 | wmem_strbuf_append_c(str, ch);
3228 | else
3229 | wmem_strbuf_append_unichar_repl(str)wmem_strbuf_append_unichar(str, 0x00FFFD);
3230 | ptr++;
3231 | label_len--;
3232 | length--;
3233 | }
3234 |
3235 | if (length == 0)
3236 | goto end;
3237 |
3238 | wmem_strbuf_append_c(str, '.');
3239 | }
3240 | }
3241 |
3242 | end:
3243 | return (uint8_t *) wmem_strbuf_finalize(str);
3244 | }
3245 |
3246 | static uint8_t *
3247 | tvb_get_dect_standard_8bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int length)
3248 | {
3249 | const uint8_t *ptr;
3250 |
3251 | ptr = ensure_contiguous(tvb, offset, length);
3252 | return get_dect_standard_8bits_string(scope, ptr, length);
3253 | }
3254 |
3255 | /*
3256 | * Given a tvbuff, an offset, a length, and an encoding, allocate a
3257 | * buffer big enough to hold a non-null-terminated string of that length
3258 | * at that offset, plus a trailing '\0', copy into the buffer the
3259 | * string as converted from the appropriate encoding to UTF-8, and
3260 | * return a pointer to the string.
3261 | */
3262 | uint8_t *
3263 | tvb_get_string_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset,
3264 | const int length, const unsigned encoding)
3265 | {
3266 | uint8_t *strptr;
3267 | bool_Bool odd, skip_first;
3268 |
3269 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3269, "tvb && tvb->initialized" ))));
3270 |
3271 | /* make sure length = -1 fails */
3272 | if (length < 0) {
3273 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
3274 | }
3275 |
3276 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3277 |
3278 | case ENC_ASCII0x00000000:
3279 | default:
3280 | /*
3281 | * For now, we treat bogus values as meaning
3282 | * "ASCII" rather than reporting an error,
3283 | * for the benefit of old dissectors written
3284 | * when the last argument to proto_tree_add_item()
3285 | * was a bool for the byte order, not an
3286 | * encoding value, and passed non-zero values
3287 | * other than true to mean "little-endian".
3288 | */
3289 | strptr = tvb_get_ascii_string(scope, tvb, offset, length);
3290 | break;
3291 |
3292 | case ENC_UTF_80x00000002:
3293 | strptr = tvb_get_utf_8_string(scope, tvb, offset, length);
3294 | break;
3295 |
3296 | case ENC_UTF_160x00000004:
3297 | strptr = tvb_get_utf_16_string(scope, tvb, offset, length,
3298 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3299 | break;
3300 |
3301 | case ENC_UCS_20x00000006:
3302 | strptr = tvb_get_ucs_2_string(scope, tvb, offset, length,
3303 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3304 | break;
3305 |
3306 | case ENC_UCS_40x00000008:
3307 | strptr = (uint8_t*)tvb_get_ucs_4_string(scope, tvb, offset, length,
3308 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3309 | break;
3310 |
3311 | case ENC_ISO_8859_10x0000000A:
3312 | /*
3313 | * ISO 8859-1 printable code point values are equal
3314 | * to the equivalent Unicode code point value, so
3315 | * no translation table is needed.
3316 | */
3317 | strptr = tvb_get_string_8859_1(scope, tvb, offset, length);
3318 | break;
3319 |
3320 | case ENC_ISO_8859_20x0000000C:
3321 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_2);
3322 | break;
3323 |
3324 | case ENC_ISO_8859_30x0000000E:
3325 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_3);
3326 | break;
3327 |
3328 | case ENC_ISO_8859_40x00000010:
3329 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_4);
3330 | break;
3331 |
3332 | case ENC_ISO_8859_50x00000012:
3333 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_5);
3334 | break;
3335 |
3336 | case ENC_ISO_8859_60x00000014:
3337 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_6);
3338 | break;
3339 |
3340 | case ENC_ISO_8859_70x00000016:
3341 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_7);
3342 | break;
3343 |
3344 | case ENC_ISO_8859_80x00000018:
3345 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_8);
3346 | break;
3347 |
3348 | case ENC_ISO_8859_90x0000001A:
3349 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_9);
3350 | break;
3351 |
3352 | case ENC_ISO_8859_100x0000001C:
3353 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_10);
3354 | break;
3355 |
3356 | case ENC_ISO_8859_110x0000001E:
3357 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_11);
3358 | break;
3359 |
3360 | case ENC_ISO_8859_130x00000022:
3361 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_13);
3362 | break;
3363 |
3364 | case ENC_ISO_8859_140x00000024:
3365 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_14);
3366 | break;
3367 |
3368 | case ENC_ISO_8859_150x00000026:
3369 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_15);
3370 | break;
3371 |
3372 | case ENC_ISO_8859_160x00000028:
3373 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_16);
3374 | break;
3375 |
3376 | case ENC_WINDOWS_12500x0000002A:
3377 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1250);
3378 | break;
3379 |
3380 | case ENC_WINDOWS_12510x0000003C:
3381 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1251);
3382 | break;
3383 |
3384 | case ENC_WINDOWS_12520x0000003A:
3385 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1252);
3386 | break;
3387 |
3388 | case ENC_MAC_ROMAN0x00000030:
3389 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_mac_roman);
3390 | break;
3391 |
3392 | case ENC_CP4370x00000032:
3393 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp437);
3394 | break;
3395 |
3396 | case ENC_CP8550x0000003E:
3397 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp855);
3398 | break;
3399 |
3400 | case ENC_CP8660x00000040:
3401 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp866);
3402 | break;
3403 |
3404 | case ENC_ISO_646_BASIC0x00000042:
3405 | strptr = tvb_get_iso_646_string(scope, tvb, offset, length, charset_table_iso_646_basic);
3406 | break;
3407 |
3408 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3409 | {
3410 | int bit_offset = offset << 3;
3411 | int no_of_chars = (length << 3) / 7;
3412 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_packed(scope, tvb, bit_offset, no_of_chars);
3413 | }
3414 | break;
3415 |
3416 | case ENC_ASCII_7BITS0x00000034:
3417 | {
3418 | int bit_offset = offset << 3;
3419 | int no_of_chars = (length << 3) / 7;
3420 | strptr = (uint8_t*)tvb_get_ascii_7bits_string(scope, tvb, bit_offset, no_of_chars);
3421 | }
3422 | break;
3423 |
3424 | case ENC_EBCDIC0x0000002E:
3425 | /*
3426 | * "Common" EBCDIC, covering all characters with the
3427 | * same code point in all Roman-alphabet EBCDIC code
3428 | * pages.
3429 | */
3430 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic);
3431 | break;
3432 |
3433 | case ENC_EBCDIC_CP0370x00000038:
3434 | /*
3435 | * EBCDIC code page 037.
3436 | */
3437 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp037);
3438 | break;
3439 |
3440 | case ENC_EBCDIC_CP5000x00000060:
3441 | /*
3442 | * EBCDIC code page 500.
3443 | */
3444 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp500);
3445 | break;
3446 |
3447 | case ENC_T610x00000036:
3448 | strptr = tvb_get_t61_string(scope, tvb, offset, length);
3449 | break;
3450 |
3451 | case ENC_BCD_DIGITS_0_90x00000044:
3452 | /*
3453 | * Packed BCD, with digits 0-9.
3454 | */
3455 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3456 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3457 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt0_9_bcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3458 | break;
3459 |
3460 | case ENC_KEYPAD_ABC_TBCD0x00000046:
3461 | /*
3462 | * Keypad-with-a/b/c "telephony BCD" - packed BCD, with
3463 | * digits 0-9 and symbols *, #, a, b, and c.
3464 | */
3465 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3466 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3467 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_keypad_abc_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3468 | break;
3469 |
3470 | case ENC_KEYPAD_BC_TBCD0x00000048:
3471 | /*
3472 | * Keypad-with-B/C "telephony BCD" - packed BCD, with
3473 | * digits 0-9 and symbols B, C, *, and #.
3474 | */
3475 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3476 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3477 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_ansi_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3478 | break;
3479 |
3480 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3481 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_unpacked(scope, tvb, offset, length);
3482 | break;
3483 |
3484 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3485 | strptr = (uint8_t*)tvb_get_etsi_ts_102_221_annex_a_string(scope, tvb, offset, length);
3486 | break;
3487 |
3488 | case ENC_GB180300x00000050:
3489 | strptr = tvb_get_gb18030_string(scope, tvb, offset, length);
3490 | break;
3491 |
3492 | case ENC_EUC_KR0x00000052:
3493 | strptr = tvb_get_euc_kr_string(scope, tvb, offset, length);
3494 | break;
3495 |
3496 | case ENC_APN_STR0x00000054:
3497 | strptr = tvb_get_apn_string(scope, tvb, offset, length);
3498 | break;
3499 |
3500 | case ENC_DECT_STANDARD_8BITS0x00000056:
3501 | strptr = tvb_get_dect_standard_8bits_string(scope, tvb, offset, length);
3502 | break;
3503 |
3504 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
3505 | /*
3506 | * DECT standard 4bits "telephony BCD" - packed BCD, with
3507 | * digits 0-9 and symbol SPACE for 0xb.
3508 | */
3509 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3510 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3511 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_dect_standard_4bits_tbcd, skip_first, odd, false0);
3512 | break;
3513 | }
3514 | return strptr;
3515 | }
3516 |
3517 | /*
3518 | * This is like tvb_get_string_enc(), except that it handles null-padded
3519 | * strings.
3520 | *
3521 | * Currently, string values are stored as UTF-8 null-terminated strings,
3522 | * so nothing needs to be done differently for null-padded strings; we
3523 | * could save a little memory by not storing the null padding.
3524 | *
3525 | * If we ever store string values differently, in a fashion that doesn't
3526 | * involve null termination, that might change.
3527 | */
3528 | uint8_t *
3529 | tvb_get_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset,
3530 | const int length, const unsigned encoding)
3531 | {
3532 | return tvb_get_string_enc(scope, tvb, offset, length, encoding);
3533 | }
3534 |
3535 | /*
3536 | * These routines are like the above routines, except that they handle
3537 | * null-terminated strings. They find the length of that string (and
3538 | * throw an exception if the tvbuff ends before we find the null), and
3539 | * also return through a pointer the length of the string, in bytes,
3540 | * including the terminating null (the terminating null being 2 bytes
3541 | * for UCS-2 and UTF-16, 4 bytes for UCS-4, and 1 byte for other
3542 | * encodings).
3543 | */
3544 | static uint8_t *
3545 | tvb_get_ascii_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3546 | {
3547 | unsigned size;
3548 | const uint8_t *ptr;
3549 |
3550 | size = tvb_strsize(tvb, offset);
3551 | ptr = ensure_contiguous(tvb, offset, size);
3552 | /* XXX, conversion between signed/unsigned integer */
3553 | if (lengthp)
3554 | *lengthp = size;
3555 | return get_ascii_string(scope, ptr, size);
3556 | }
3557 |
3558 | static uint8_t *
3559 | tvb_get_iso_646_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[0x80])
3560 | {
3561 | unsigned size;
3562 | const uint8_t *ptr;
3563 |
3564 | size = tvb_strsize(tvb, offset);
3565 | ptr = ensure_contiguous(tvb, offset, size);
3566 | /* XXX, conversion between signed/unsigned integer */
3567 | if (lengthp)
3568 | *lengthp = size;
3569 | return get_iso_646_string(scope, ptr, size, table);
3570 | }
3571 |
3572 | static uint8_t *
3573 | tvb_get_utf_8_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp)
3574 | {
3575 | unsigned size;
3576 | const uint8_t *ptr;
3577 |
3578 | size = tvb_strsize(tvb, offset);
3579 | ptr = ensure_contiguous(tvb, offset, size);
3580 | /* XXX, conversion between signed/unsigned integer */
3581 | if (lengthp)
3582 | *lengthp = size;
3583 | return get_utf_8_string(scope, ptr, size);
3584 | }
3585 |
3586 | static uint8_t *
3587 | tvb_get_stringz_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3588 | {
3589 | unsigned size;
3590 | const uint8_t *ptr;
3591 |
3592 | size = tvb_strsize(tvb, offset);
3593 | ptr = ensure_contiguous(tvb, offset, size);
3594 | /* XXX, conversion between signed/unsigned integer */
3595 | if (lengthp)
3596 | *lengthp = size;
3597 | return get_8859_1_string(scope, ptr, size);
3598 | }
3599 |
3600 | static uint8_t *
3601 | tvb_get_stringz_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[0x80])
3602 | {
3603 | unsigned size;
3604 | const uint8_t *ptr;
3605 |
3606 | size = tvb_strsize(tvb, offset);
3607 | ptr = ensure_contiguous(tvb, offset, size);
3608 | /* XXX, conversion between signed/unsigned integer */
3609 | if (lengthp)
3610 | *lengthp = size;
3611 | return get_unichar2_string(scope, ptr, size, table);
3612 | }
3613 |
3614 | /*
3615 | * Given a tvbuff and an offset, with the offset assumed to refer to
3616 | * a null-terminated string, find the length of that string (and throw
3617 | * an exception if the tvbuff ends before we find the null), ensure that
3618 | * the TVB is flat, and return a pointer to the string (in the TVB).
3619 | * Also return the length of the string (including the terminating null)
3620 | * through a pointer.
3621 | *
3622 | * As long as we aren't using composite TVBs, this saves the cycles used
3623 | * (often unnecessarily) in allocating a buffer and copying the string into
3624 | * it. (If we do start using composite TVBs, we may want to replace this
3625 | * function with the _ephemeral version.)
3626 | */
3627 | const uint8_t *
3628 | tvb_get_const_stringz(tvbuff_t *tvb, const int offset, int *lengthp)
3629 | {
3630 | unsigned size;
3631 | const uint8_t *strptr;
3632 |
3633 | size = tvb_strsize(tvb, offset);
3634 | strptr = ensure_contiguous(tvb, offset, size);
3635 | if (lengthp)
3636 | *lengthp = size;
3637 | return strptr;
3638 | }
3639 |
3640 | static char *
3641 | tvb_get_ucs_2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding)
3642 | {
3643 | int size; /* Number of bytes in string */
3644 | const uint8_t *ptr;
3645 |
3646 | size = tvb_unicode_strsize(tvb, offset);
3647 | ptr = ensure_contiguous(tvb, offset, size);
3648 | /* XXX, conversion between signed/unsigned integer */
3649 | if (lengthp)
3650 | *lengthp = size;
3651 | return (char*)get_ucs_2_string(scope, ptr, size, encoding);
3652 | }
3653 |
3654 | static char *
3655 | tvb_get_utf_16_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding)
3656 | {
3657 | int size;
3658 | const uint8_t *ptr;
3659 |
3660 | size = tvb_unicode_strsize(tvb, offset);
3661 | ptr = ensure_contiguous(tvb, offset, size);
3662 | /* XXX, conversion between signed/unsigned integer */
3663 | if (lengthp)
3664 | *lengthp = size;
3665 | return (char*)get_utf_16_string(scope, ptr, size, encoding);
3666 | }
3667 |
3668 | static char *
3669 | tvb_get_ucs_4_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding)
3670 | {
3671 | int size;
3672 | gunichar uchar;
3673 | const uint8_t *ptr;
3674 |
3675 | size = 0;
3676 | do {
3677 | /* Endianness doesn't matter when looking for null */
3678 | uchar = tvb_get_ntohl(tvb, offset + size);
3679 | size += 4;
3680 | } while(uchar != 0);
3681 |
3682 | ptr = ensure_contiguous(tvb, offset, size);
3683 | /* XXX, conversion between signed/unsigned integer */
3684 | if (lengthp)
3685 | *lengthp = size;
3686 | return (char*)get_ucs_4_string(scope, ptr, size, encoding);
3687 | }
3688 |
3689 | static uint8_t *
3690 | tvb_get_nonascii_unichar2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp, const gunichar2 table[256])
3691 | {
3692 | unsigned size;
3693 | const uint8_t *ptr;
3694 |
3695 | size = tvb_strsize(tvb, offset);
3696 | ptr = ensure_contiguous(tvb, offset, size);
3697 | /* XXX, conversion between signed/unsigned integer */
3698 | if (lengthp)
3699 | *lengthp = size;
3700 | return get_nonascii_unichar2_string(scope, ptr, size, table);
3701 | }
3702 |
3703 | static uint8_t *
3704 | tvb_get_t61_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3705 | {
3706 | unsigned size;
3707 | const uint8_t *ptr;
3708 |
3709 | size = tvb_strsize(tvb, offset);
3710 | ptr = ensure_contiguous(tvb, offset, size);
3711 | /* XXX, conversion between signed/unsigned integer */
3712 | if (lengthp)
3713 | *lengthp = size;
3714 | return get_t61_string(scope, ptr, size);
3715 | }
3716 |
3717 | static uint8_t *
3718 | tvb_get_gb18030_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3719 | {
3720 | unsigned size;
3721 | const uint8_t *ptr;
3722 |
3723 | size = tvb_strsize(tvb, offset);
3724 | ptr = ensure_contiguous(tvb, offset, size);
3725 | /* XXX, conversion between signed/unsigned integer */
3726 | if (lengthp)
3727 | *lengthp = size;
3728 | return get_gb18030_string(scope, ptr, size);
3729 | }
3730 |
3731 | static uint8_t *
3732 | tvb_get_euc_kr_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3733 | {
3734 | unsigned size;
3735 | const uint8_t *ptr;
3736 |
3737 | size = tvb_strsize(tvb, offset);
3738 | ptr = ensure_contiguous(tvb, offset, size);
3739 | /* XXX, conversion between signed/unsigned integer */
3740 | if (lengthp)
3741 | *lengthp = size;
3742 | return get_euc_kr_string(scope, ptr, size);
3743 | }
3744 |
3745 | static uint8_t *
3746 | tvb_get_dect_standard_8bits_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, int offset, int *lengthp)
3747 | {
3748 | unsigned size;
3749 | const uint8_t *ptr;
3750 |
3751 | size = tvb_strsize(tvb, offset);
3752 | ptr = ensure_contiguous(tvb, offset, size);
3753 | /* XXX, conversion between signed/unsigned integer */
3754 | if (lengthp)
3755 | *lengthp = size;
3756 | return get_dect_standard_8bits_string(scope, ptr, size);
3757 | }
3758 |
3759 | uint8_t *
3760 | tvb_get_stringz_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int *lengthp, const unsigned encoding)
3761 | {
3762 | uint8_t *strptr;
3763 |
3764 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3764, "tvb && tvb->initialized" ))));
3765 |
3766 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3767 |
3768 | case ENC_ASCII0x00000000:
3769 | default:
3770 | /*
3771 | * For now, we treat bogus values as meaning
3772 | * "ASCII" rather than reporting an error,
3773 | * for the benefit of old dissectors written
3774 | * when the last argument to proto_tree_add_item()
3775 | * was a bool for the byte order, not an
3776 | * encoding value, and passed non-zero values
3777 | * other than true to mean "little-endian".
3778 | */
3779 | strptr = tvb_get_ascii_stringz(scope, tvb, offset, lengthp);
3780 | break;
3781 |
3782 | case ENC_UTF_80x00000002:
3783 | /*
3784 | * XXX - should map all invalid UTF-8 sequences
3785 | * to a "substitute" UTF-8 character.
3786 | * XXX - should map code points > 10FFFF to REPLACEMENT
3787 | * CHARACTERs.
3788 | */
3789 | strptr = tvb_get_utf_8_stringz(scope, tvb, offset, lengthp);
3790 | break;
3791 |
3792 | case ENC_UTF_160x00000004:
3793 | strptr = (uint8_t*)tvb_get_utf_16_stringz(scope, tvb, offset, lengthp,
3794 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3795 | break;
3796 |
3797 | case ENC_UCS_20x00000006:
3798 | strptr = (uint8_t*)tvb_get_ucs_2_stringz(scope, tvb, offset, lengthp,
3799 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3800 | break;
3801 |
3802 | case ENC_UCS_40x00000008:
3803 | strptr = (uint8_t*)tvb_get_ucs_4_stringz(scope, tvb, offset, lengthp,
3804 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3805 | break;
3806 |
3807 | case ENC_ISO_8859_10x0000000A:
3808 | /*
3809 | * ISO 8859-1 printable code point values are equal
3810 | * to the equivalent Unicode code point value, so
3811 | * no translation table is needed.
3812 | */
3813 | strptr = tvb_get_stringz_8859_1(scope, tvb, offset, lengthp);
3814 | break;
3815 |
3816 | case ENC_ISO_8859_20x0000000C:
3817 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_2);
3818 | break;
3819 |
3820 | case ENC_ISO_8859_30x0000000E:
3821 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_3);
3822 | break;
3823 |
3824 | case ENC_ISO_8859_40x00000010:
3825 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_4);
3826 | break;
3827 |
3828 | case ENC_ISO_8859_50x00000012:
3829 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_5);
3830 | break;
3831 |
3832 | case ENC_ISO_8859_60x00000014:
3833 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_6);
3834 | break;
3835 |
3836 | case ENC_ISO_8859_70x00000016:
3837 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_7);
3838 | break;
3839 |
3840 | case ENC_ISO_8859_80x00000018:
3841 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_8);
3842 | break;
3843 |
3844 | case ENC_ISO_8859_90x0000001A:
3845 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_9);
3846 | break;
3847 |
3848 | case ENC_ISO_8859_100x0000001C:
3849 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_10);
3850 | break;
3851 |
3852 | case ENC_ISO_8859_110x0000001E:
3853 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_11);
3854 | break;
3855 |
3856 | case ENC_ISO_8859_130x00000022:
3857 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_13);
3858 | break;
3859 |
3860 | case ENC_ISO_8859_140x00000024:
3861 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_14);
3862 | break;
3863 |
3864 | case ENC_ISO_8859_150x00000026:
3865 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_15);
3866 | break;
3867 |
3868 | case ENC_ISO_8859_160x00000028:
3869 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_16);
3870 | break;
3871 |
3872 | case ENC_WINDOWS_12500x0000002A:
3873 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1250);
3874 | break;
3875 |
3876 | case ENC_WINDOWS_12510x0000003C:
3877 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1251);
3878 | break;
3879 |
3880 | case ENC_WINDOWS_12520x0000003A:
3881 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1252);
3882 | break;
3883 |
3884 | case ENC_MAC_ROMAN0x00000030:
3885 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_mac_roman);
3886 | break;
3887 |
3888 | case ENC_CP4370x00000032:
3889 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp437);
3890 | break;
3891 |
3892 | case ENC_CP8550x0000003E:
3893 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp855);
3894 | break;
3895 |
3896 | case ENC_CP8660x00000040:
3897 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp866);
3898 | break;
3899 |
3900 | case ENC_ISO_646_BASIC0x00000042:
3901 | strptr = tvb_get_iso_646_stringz(scope, tvb, offset, lengthp, charset_table_iso_646_basic);
3902 | break;
3903 |
3904 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3905 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3906 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3907 | 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" );
3908 | break;
3909 |
3910 | case ENC_ASCII_7BITS0x00000034:
3911 | 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" );
3912 | break;
3913 |
3914 | case ENC_EBCDIC0x0000002E:
3915 | /*
3916 | * "Common" EBCDIC, covering all characters with the
3917 | * same code point in all Roman-alphabet EBCDIC code
3918 | * pages.
3919 | */
3920 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic);
3921 | break;
3922 |
3923 | case ENC_EBCDIC_CP0370x00000038:
3924 | /*
3925 | * EBCDIC code page 037.
3926 | */
3927 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp037);
3928 | break;
3929 |
3930 | case ENC_EBCDIC_CP5000x00000060:
3931 | /*
3932 | * EBCDIC code page 500.
3933 | */
3934 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp500);
3935 | break;
3936 |
3937 | case ENC_T610x00000036:
3938 | strptr = tvb_get_t61_stringz(scope, tvb, offset, lengthp);
3939 | break;
3940 |
3941 | case ENC_GB180300x00000050:
3942 | strptr = tvb_get_gb18030_stringz(scope, tvb, offset, lengthp);
3943 | break;
3944 |
3945 | case ENC_EUC_KR0x00000052:
3946 | strptr = tvb_get_euc_kr_stringz(scope, tvb, offset, lengthp);
3947 | break;
3948 |
3949 | case ENC_DECT_STANDARD_8BITS0x00000056:
3950 | strptr = tvb_get_dect_standard_8bits_stringz(scope, tvb, offset, lengthp);
3951 | break;
3952 | }
3953 |
3954 | return strptr;
3955 | }
3956 |
3957 | /* Looks for a stringz (NUL-terminated string) in tvbuff and copies
3958 | * no more than bufsize number of bytes, including terminating NUL, to buffer.
3959 | * Returns length of string (not including terminating NUL), or -1 if the string was
3960 | * truncated in the buffer due to not having reached the terminating NUL.
3961 | * In this way, it acts like snprintf().
3962 | *
3963 | * bufsize MUST be greater than 0.
3964 | *
3965 | * When processing a packet where the remaining number of bytes is less
3966 | * than bufsize, an exception is not thrown if the end of the packet
3967 | * is reached before the NUL is found. If no NUL is found before reaching
3968 | * the end of the short packet, -1 is still returned, and the string
3969 | * is truncated with a NUL, albeit not at buffer[bufsize - 1], but
3970 | * at the correct spot, terminating the string.
3971 | *
3972 | * *bytes_copied will contain the number of bytes actually copied,
3973 | * including the terminating-NUL.
3974 | */
3975 | static int
3976 | _tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer, int *bytes_copied)
3977 | {
3978 | int stringlen;
3979 | unsigned abs_offset = 0;
3980 | int limit;
3981 | unsigned len = 0;
3982 | bool_Bool decreased_max = false0;
3983 |
3984 | /* Only read to end of tvbuff, w/o throwing exception. */
3985 | check_offset_length(tvb, offset, -1, &abs_offset, &len);
3986 |
3987 | /* There must at least be room for the terminating NUL. */
3988 | DISSECTOR_ASSERT(bufsize != 0)((void) ((bufsize != 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3988, "bufsize != 0" ))));
3989 |
3990 | /* If there's no room for anything else, just return the NUL. */
3991 | if (bufsize == 1) {
3992 | buffer[0] = 0;
3993 | *bytes_copied = 1;
3994 | return 0;
3995 | }
3996 |
3997 | /* check_offset_length() won't throw an exception if we're
3998 | * looking at the byte immediately after the end of the tvbuff. */
3999 | if (len == 0) {
4000 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
4001 | }
4002 |
4003 | /*
4004 | * If we've been passed a negative number, bufsize will
4005 | * be huge.
4006 | */
4007 | DISSECTOR_ASSERT(bufsize <= INT_MAX)((void) ((bufsize <= 2147483647) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4007, "bufsize <= 2147483647" ))));
4008 |
4009 | if ((unsigned)len < bufsize) {
4010 | limit = len;
4011 | decreased_max = true1;
4012 | }
4013 | else {
4014 | limit = bufsize;
4015 | }
4016 |
4017 | stringlen = tvb_strnlen(tvb, abs_offset, limit - 1);
4018 | /* If NUL wasn't found, copy the data and return -1 */
4019 | if (stringlen == -1) {
4020 | tvb_memcpy(tvb, buffer, abs_offset, limit);
4021 | if (decreased_max) {
4022 | buffer[limit] = 0;
4023 | /* Add 1 for the extra NUL that we set at buffer[limit],
4024 | * pretending that it was copied as part of the string. */
4025 | *bytes_copied = limit + 1;
4026 | }
4027 | else {
4028 | *bytes_copied = limit;
4029 | }
4030 | return -1;
4031 | }
4032 |
4033 | /* Copy the string to buffer */
4034 | tvb_memcpy(tvb, buffer, abs_offset, stringlen + 1);
4035 | *bytes_copied = stringlen + 1;
4036 | return stringlen;
4037 | }
4038 |
4039 | int
4040 | tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer)
4041 | {
4042 | int len, bytes_copied;
4043 |
4044 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4044, "tvb && tvb->initialized" ))));
4045 |
4046 | len = _tvb_get_raw_bytes_as_stringz(tvb, offset, bufsize, buffer, &bytes_copied);
4047 |
4048 | if (len == -1) {
4049 | buffer[bufsize - 1] = 0;
4050 | return bytes_copied - 1;
4051 | }
4052 | else {
4053 | return len;
4054 | }
4055 | }
4056 |
4057 | /*
4058 | * Given a tvbuff, an offset into the tvbuff, a buffer, and a buffer size,
4059 | * extract as many raw bytes from the tvbuff, starting at the offset,
4060 | * as 1) are available in the tvbuff and 2) will fit in the buffer, leaving
4061 | * room for a terminating NUL.
4062 | */
4063 | int
4064 | tvb_get_raw_bytes_as_string(tvbuff_t *tvb, const int offset, char *buffer, size_t bufsize)
4065 | {
4066 | int len = 0;
4067 |
4068 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4068, "tvb && tvb->initialized" ))));
4069 |
4070 | /* There must be room for the string and the terminating NUL. */
4071 | DISSECTOR_ASSERT(bufsize > 0)((void) ((bufsize > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4071, "bufsize > 0" ))));
4072 |
4073 | DISSECTOR_ASSERT(bufsize - 1 < INT_MAX)((void) ((bufsize - 1 < 2147483647) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4073, "bufsize - 1 < 2147483647" ))));
4074 |
4075 | len = tvb_captured_length_remaining(tvb, offset);
4076 | if (len <= 0) {
4077 | buffer[0] = '\0';
4078 | return 0;
4079 | }
4080 | if (len > (int)(bufsize - 1))
4081 | len = (int)(bufsize - 1);
4082 |
4083 | /* Copy the string to buffer */
4084 | tvb_memcpy(tvb, buffer, offset, len);
4085 | buffer[len] = '\0';
4086 | return len;
4087 | }
4088 |
4089 | bool_Bool
4090 | tvb_ascii_isprint(tvbuff_t *tvb, const int offset, const int length)
4091 | {
4092 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4093 | unsigned abs_offset, abs_length = length;
4094 |
4095 | if (length == -1) {
4096 | /* tvb_get_ptr has already checked for exceptions. */
4097 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4098 | }
4099 | for (unsigned i = 0; i < abs_length; i++, buf++)
4100 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4101 | return false0;
4102 |
4103 | return true1;
4104 | }
4105 |
4106 | bool_Bool
4107 | tvb_utf_8_isprint(tvbuff_t *tvb, const int offset, const int length)
4108 | {
4109 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4110 | unsigned abs_offset, abs_length = length;
4111 |
4112 | if (length == -1) {
4113 | /* tvb_get_ptr has already checked for exceptions. */
4114 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4115 | }
4116 |
4117 | return isprint_utf8_string((const char*)buf, abs_length);
4118 | }
4119 |
4120 | bool_Bool
4121 | tvb_ascii_isdigit(tvbuff_t *tvb, const int offset, const int length)
4122 | {
4123 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4124 | unsigned abs_offset, abs_length = length;
4125 |
4126 | if (length == -1) {
4127 | /* tvb_get_ptr has already checked for exceptions. */
4128 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4129 | }
4130 | for (unsigned i = 0; i < abs_length; i++, buf++)
4131 | if (!g_ascii_isdigit(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_DIGIT) != 0))
4132 | return false0;
4133 |
4134 | return true1;
4135 | }
4136 |
4137 | static ws_mempbrk_pattern pbrk_crlf;
4138 | /*
4139 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4140 | * at that offset (which may be -1 for "all the way to the end of the
4141 | * tvbuff"), find the end of the (putative) line that starts at the
4142 | * specified offset in the tvbuff, going no further than the specified
4143 | * length.
4144 | *
4145 | * Return the length of the line (not counting the line terminator at
4146 | * the end), or, if we don't find a line terminator:
4147 | *
4148 | * if "desegment" is true, return -1;
4149 | *
4150 | * if "desegment" is false, return the amount of data remaining in
4151 | * the buffer.
4152 | *
4153 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4154 | * character past the line terminator, or past the end of the buffer if
4155 | * we don't find a line terminator. (It's not set if we return -1.)
4156 | */
4157 | int
4158 | tvb_find_line_end(tvbuff_t *tvb, const int offset, int len, int *next_offset, const bool_Bool desegment)
4159 | {
4160 | int eob_offset;
4161 | int eol_offset;
4162 | int linelen;
4163 | unsigned char found_needle = 0;
4164 | static bool_Bool compiled = false0;
4165 |
4166 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4166, "tvb && tvb->initialized" ))));
4167 |
4168 | if (len == -1) {
4169 | len = _tvb_captured_length_remaining(tvb, offset);
4170 | /* if offset is past the end of the tvbuff, len is now 0 */
4171 | }
4172 |
4173 | eob_offset = offset + len;
4174 |
4175 | if (!compiled) {
4176 | ws_mempbrk_compile(&pbrk_crlf, "\r\n");
4177 | compiled = true1;
4178 | }
4179 |
4180 | /*
4181 | * Look either for a CR or an LF.
4182 | */
4183 | eol_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_crlf, &found_needle);
4184 | if (eol_offset == -1) {
4185 | /*
4186 | * No CR or LF - line is presumably continued in next packet.
4187 | */
4188 | if (desegment) {
4189 | /*
4190 | * Tell our caller we saw no EOL, so they can
4191 | * try to desegment and get the entire line
4192 | * into one tvbuff.
4193 | */
4194 | return -1;
4195 | } else {
4196 | /*
4197 | * Pretend the line runs to the end of the tvbuff.
4198 | */
4199 | linelen = eob_offset - offset;
4200 | if (next_offset)
4201 | *next_offset = eob_offset;
4202 | }
4203 | } else {
4204 | /*
4205 | * Find the number of bytes between the starting offset
4206 | * and the CR or LF.
4207 | */
4208 | linelen = eol_offset - offset;
4209 |
4210 | /*
4211 | * Is it a CR?
4212 | */
4213 | if (found_needle == '\r') {
4214 | /*
4215 | * Yes - is it followed by an LF?
4216 | */
4217 | if (eol_offset + 1 >= eob_offset) {
4218 | /*
4219 | * Dunno - the next byte isn't in this
4220 | * tvbuff.
4221 | */
4222 | if (desegment) {
4223 | /*
4224 | * We'll return -1, although that
4225 | * runs the risk that if the line
4226 | * really *is* terminated with a CR,
4227 | * we won't properly dissect this
4228 | * tvbuff.
4229 | *
4230 | * It's probably more likely that
4231 | * the line ends with CR-LF than
4232 | * that it ends with CR by itself.
4233 | */
4234 | return -1;
4235 | }
4236 | } else {
4237 | /*
4238 | * Well, we can at least look at the next
4239 | * byte.
4240 | */
4241 | if (tvb_get_uint8(tvb, eol_offset + 1) == '\n') {
4242 | /*
4243 | * It's an LF; skip over the CR.
4244 | */
4245 | eol_offset++;
4246 | }
4247 | }
4248 | }
4249 |
4250 | /*
4251 | * Return the offset of the character after the last
4252 | * character in the line, skipping over the last character
4253 | * in the line terminator.
4254 | */
4255 | if (next_offset)
4256 | *next_offset = eol_offset + 1;
4257 | }
4258 | return linelen;
4259 | }
4260 |
4261 | static ws_mempbrk_pattern pbrk_crlf_dquote;
4262 | /*
4263 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4264 | * at that offset (which may be -1 for "all the way to the end of the
4265 | * tvbuff"), find the end of the (putative) line that starts at the
4266 | * specified offset in the tvbuff, going no further than the specified
4267 | * length.
4268 | *
4269 | * However, treat quoted strings inside the buffer specially - don't
4270 | * treat newlines in quoted strings as line terminators.
4271 | *
4272 | * Return the length of the line (not counting the line terminator at
4273 | * the end), or the amount of data remaining in the buffer if we don't
4274 | * find a line terminator.
4275 | *
4276 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4277 | * character past the line terminator, or past the end of the buffer if
4278 | * we don't find a line terminator.
4279 | */
4280 | int
4281 | tvb_find_line_end_unquoted(tvbuff_t *tvb, const int offset, int len, int *next_offset)
4282 | {
4283 | int cur_offset, char_offset;
4284 | bool_Bool is_quoted;
4285 | unsigned char c = 0;
4286 | int eob_offset;
4287 | int linelen;
4288 | static bool_Bool compiled = false0;
4289 |
4290 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4290, "tvb && tvb->initialized" ))));
4291 |
4292 | if (len == -1)
4293 | len = _tvb_captured_length_remaining(tvb, offset);
4294 |
4295 | if (!compiled) {
4296 | ws_mempbrk_compile(&pbrk_crlf_dquote, "\r\n\"");
4297 | compiled = true1;
4298 | }
4299 |
4300 | /*
4301 | * XXX - what if "len" is still -1, meaning "offset is past the
4302 | * end of the tvbuff"?
4303 | */
4304 | eob_offset = offset + len;
4305 |
4306 | cur_offset = offset;
4307 | is_quoted = false0;
4308 | for (;;) {
4309 | /*
4310 | * Is this part of the string quoted?
4311 | */
4312 | if (is_quoted) {
4313 | /*
4314 | * Yes - look only for the terminating quote.
4315 | */
4316 | char_offset = tvb_find_uint8(tvb, cur_offset, len,
4317 | '"');
4318 | } else {
4319 | /*
4320 | * Look either for a CR, an LF, or a '"'.
4321 | */
4322 | char_offset = tvb_ws_mempbrk_pattern_uint8(tvb, cur_offset, len, &pbrk_crlf_dquote, &c);
4323 | }
4324 | if (char_offset == -1) {
4325 | /*
4326 | * Not found - line is presumably continued in
4327 | * next packet.
4328 | * We pretend the line runs to the end of the tvbuff.
4329 | */
4330 | linelen = eob_offset - offset;
4331 | if (next_offset)
4332 | *next_offset = eob_offset;
4333 | break;
4334 | }
4335 |
4336 | if (is_quoted) {
4337 | /*
4338 | * We're processing a quoted string.
4339 | * We only looked for ", so we know it's a ";
4340 | * as we're processing a quoted string, it's a
4341 | * closing quote.
4342 | */
4343 | is_quoted = false0;
4344 | } else {
4345 | /*
4346 | * OK, what is it?
4347 | */
4348 | if (c == '"') {
4349 | /*
4350 | * Un-quoted "; it begins a quoted
4351 | * string.
4352 | */
4353 | is_quoted = true1;
4354 | } else {
4355 | /*
4356 | * It's a CR or LF; we've found a line
4357 | * terminator.
4358 | *
4359 | * Find the number of bytes between the
4360 | * starting offset and the CR or LF.
4361 | */
4362 | linelen = char_offset - offset;
4363 |
4364 | /*
4365 | * Is it a CR?
4366 | */
4367 | if (c == '\r') {
4368 | /*
4369 | * Yes; is it followed by an LF?
4370 | */
4371 | if (char_offset + 1 < eob_offset &&
4372 | tvb_get_uint8(tvb, char_offset + 1)
4373 | == '\n') {
4374 | /*
4375 | * Yes; skip over the CR.
4376 | */
4377 | char_offset++;
4378 | }
4379 | }
4380 |
4381 | /*
4382 | * Return the offset of the character after
4383 | * the last character in the line, skipping
4384 | * over the last character in the line
4385 | * terminator, and quit.
4386 | */
4387 | if (next_offset)
4388 | *next_offset = char_offset + 1;
4389 | break;
4390 | }
4391 | }
4392 |
4393 | /*
4394 | * Step past the character we found.
4395 | */
4396 | cur_offset = char_offset + 1;
4397 | if (cur_offset >= eob_offset) {
4398 | /*
4399 | * The character we found was the last character
4400 | * in the tvbuff - line is presumably continued in
4401 | * next packet.
4402 | * We pretend the line runs to the end of the tvbuff.
4403 | */
4404 | linelen = eob_offset - offset;
4405 | if (next_offset)
4406 | *next_offset = eob_offset;
4407 | break;
4408 | }
4409 | }
4410 | return linelen;
4411 | }
4412 |
4413 | /*
4414 | * Copied from the mgcp dissector. (This function should be moved to /epan )
4415 | * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
4416 | * character following offset or offset + maxlength -1 whichever
4417 | * is smaller.
4418 | *
4419 | * Parameters:
4420 | * tvb - The tvbuff in which we are skipping whitespace.
4421 | * offset - The offset in tvb from which we begin trying to skip whitespace.
4422 | * maxlength - The maximum distance from offset that we may try to skip
4423 | * whitespace.
4424 | *
4425 | * Returns: The position in tvb of the first non-whitespace
4426 | * character following offset or offset + maxlength -1 whichever
4427 | * is smaller.
4428 | */
4429 | int
4430 | tvb_skip_wsp(tvbuff_t *tvb, const int offset, const int maxlength)
4431 | {
4432 | int counter;
4433 | int end, tvb_len;
4434 | uint8_t tempchar;
4435 |
4436 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4436, "tvb && tvb->initialized" ))));
4437 |
4438 | /* Get the length remaining */
4439 | /*tvb_len = tvb_captured_length(tvb);*/
4440 | tvb_len = tvb->length;
4441 |
4442 | end = offset + maxlength;
4443 | if (end >= tvb_len)
4444 | {
4445 | end = tvb_len;
4446 | }
4447 |
4448 | /* Skip past spaces, tabs, CRs and LFs until run out or meet something else */
4449 | for (counter = offset;
4450 | counter < end &&
4451 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4452 | tempchar == '\t' || tempchar == '\r' || tempchar == '\n');
4453 | counter++);
4454 |
4455 | return (counter);
4456 | }
4457 |
4458 | int
4459 | tvb_skip_wsp_return(tvbuff_t *tvb, const int offset)
4460 | {
4461 | int counter;
4462 | uint8_t tempchar;
4463 |
4464 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4464, "tvb && tvb->initialized" ))));
4465 |
4466 | for (counter = offset; counter > 0 &&
4467 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4468 | tempchar == '\t' || tempchar == '\n' || tempchar == '\r'); counter--);
4469 | counter++;
4470 |
4471 | return (counter);
4472 | }
4473 |
4474 | int
4475 | tvb_skip_uint8(tvbuff_t *tvb, int offset, const int maxlength, const uint8_t ch)
4476 | {
4477 | int end, tvb_len;
4478 |
4479 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4479, "tvb && tvb->initialized" ))));
4480 |
4481 | /* Get the length remaining */
4482 | /*tvb_len = tvb_captured_length(tvb);*/
4483 | tvb_len = tvb->length;
4484 |
4485 | end = offset + maxlength;
4486 | if (end >= tvb_len)
4487 | end = tvb_len;
4488 |
4489 | while (offset < end) {
4490 | uint8_t tempch = tvb_get_uint8(tvb, offset);
4491 |
4492 | if (tempch != ch)
4493 | break;
4494 | offset++;
4495 | }
4496 |
4497 | return offset;
4498 | }
4499 |
4500 | static ws_mempbrk_pattern pbrk_whitespace;
4501 |
4502 | int tvb_get_token_len(tvbuff_t *tvb, const int offset, int len, int *next_offset, const bool_Bool desegment)
4503 | {
4504 | int eob_offset;
4505 | int eot_offset;
4506 | int tokenlen;
4507 | unsigned char found_needle = 0;
4508 | static bool_Bool compiled = false0;
4509 |
4510 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4510, "tvb && tvb->initialized" ))));
4511 |
4512 | if (len == -1) {
4513 | len = _tvb_captured_length_remaining(tvb, offset);
4514 | /* if offset is past the end of the tvbuff, len is now 0 */
4515 | }
4516 |
4517 | eob_offset = offset + len;
4518 |
4519 | if (!compiled) {
4520 | ws_mempbrk_compile(&pbrk_whitespace, " \r\n");
4521 | compiled = true1;
4522 | }
4523 |
4524 | /*
4525 | * Look either for a space, CR, or LF.
4526 | */
4527 | eot_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_whitespace, &found_needle);
4528 | if (eot_offset == -1) {
4529 | /*
4530 | * No space, CR or LF - token is presumably continued in next packet.
4531 | */
4532 | if (desegment) {
4533 | /*
4534 | * Tell our caller we saw no whitespace, so they can
4535 | * try to desegment and get the entire line
4536 | * into one tvbuff.
4537 | */
4538 | return -1;
4539 | }
4540 | else {
4541 | /*
4542 | * Pretend the token runs to the end of the tvbuff.
4543 | */
4544 | tokenlen = eob_offset - offset;
4545 | if (next_offset)
4546 | *next_offset = eob_offset;
4547 | }
4548 | }
4549 | else {
4550 | /*
4551 | * Find the number of bytes between the starting offset
4552 | * and the space, CR or LF.
4553 | */
4554 | tokenlen = eot_offset - offset;
4555 |
4556 | /*
4557 | * Return the offset of the character after the last
4558 | * character in the line, skipping over the last character
4559 | * in the line terminator.
4560 | */
4561 | if (next_offset)
4562 | *next_offset = eot_offset + 1;
4563 | }
4564 | return tokenlen;
4565 | }
4566 |
4567 | /*
4568 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
4569 | * to the string with the formatted data, with "punct" as a byte
4570 | * separator.
4571 | */
4572 | char *
4573 | tvb_bytes_to_str_punct(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const char punct)
4574 | {
4575 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4575, "len >= 0" ))));
4576 | 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);
4577 | }
4578 |
4579 | /*
4580 | * Given a wmem scope, a tvbuff, an offset, a length, an input digit
4581 | * set, and a boolean indicator, fetch BCD-encoded digits from a
4582 | * tvbuff starting from either the low or high half byte of the
4583 | * first byte depending on the boolean indicator (true means "start
4584 | * with the high half byte, ignoring the low half byte", and false
4585 | * means "start with the low half byte and proceed to the high half
4586 | * byte), formating the digits into characters according to the
4587 | * input digit set, and return a pointer to a UTF-8 string, allocated
4588 | * using the wmem scope. A nibble of 0xf is considered a 'filler'
4589 | * and will end the conversion. Similarly if odd is set the last
4590 | * high nibble will be omitted. (Note that if both skip_first and
4591 | * odd are true, then both the first and last semi-octet are skipped,
4592 | * i.e. an even number of nibbles are considered.)
4593 | */
4594 | char *
4595 | 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)
4596 | {
4597 | const uint8_t *ptr;
4598 | int i = 0;
4599 | char *digit_str;
4600 | uint8_t octet, nibble;
4601 |
4602 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4602, "tvb && tvb->initialized" ))));
4603 |
4604 | if (len == -1) {
4605 | /*
4606 | * Run to the end of the captured data.
4607 | *
4608 | * XXX - captured, or total?
4609 | */
4610 | /*length = tvb_captured_length(tvb);*/
4611 | len = tvb->length;
4612 | if (len < offset) {
4613 | return (char *)"";
4614 | }
4615 | len -= offset;
4616 | }
4617 |
4618 | ptr = ensure_contiguous(tvb, offset, len);
4619 |
4620 | /*
4621 | * XXX - map illegal digits (digits that map to 0) to REPLACEMENT
4622 | * CHARACTER, and have all the tables in epan/tvbuff.c use 0 rather
4623 | * than '?'?
4624 | */
4625 | digit_str = (char *)wmem_alloc(scope, len*2 + 1);
4626 |
4627 | while (len > 0) {
4628 | octet = *ptr;
4629 | if (!skip_first) {
4630 | if (bigendian) {
4631 | nibble = (octet >> 4) & 0x0f;
4632 | } else {
4633 | nibble = octet & 0x0f;
4634 | }
4635 | if (nibble == 0x0f) {
4636 | /*
4637 | * Stop digit.
4638 | */
4639 | break;
4640 | }
4641 | digit_str[i] = dgt->out[nibble];
4642 | i++;
4643 | }
4644 | skip_first = false0;
4645 |
4646 | /*
4647 | * unpack second value in byte
4648 | */
4649 | if (bigendian) {
4650 | nibble = octet & 0x0f;
4651 | } else {
4652 | nibble = octet >> 4;
4653 | }
4654 |
4655 | if (nibble == 0x0f) {
4656 | /*
4657 | * This is the stop digit or a filler digit. Ignore
4658 | * it.
4659 | */
4660 | break;
4661 | }
4662 | if ((len == 1) && (odd == true1 )){
4663 | /* Last octet, skip last high nibble in case of odd number of digits */
4664 | break;
4665 | }
4666 | digit_str[i] = dgt->out[nibble];
4667 | i++;
4668 |
4669 | ptr++;
4670 | len--;
4671 | }
4672 | digit_str[i] = '\0';
4673 | return digit_str;
4674 | }
4675 |
4676 | /* XXXX Fix me - needs odd indicator added */
4677 | const char *
4678 | 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)
4679 | {
4680 | if (!dgt)
4681 | dgt = &Dgt0_9_bcd;
4682 |
4683 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, false0);
4684 | }
4685 |
4686 | const char *
4687 | 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)
4688 | {
4689 | if (!dgt)
4690 | dgt = &Dgt0_9_bcd;
4691 |
4692 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, true1);
4693 | }
4694 |
4695 | /*
4696 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
4697 | * to the string with the formatted data.
4698 | */
4699 | char *tvb_bytes_to_str(wmem_allocator_t *allocator, tvbuff_t *tvb,
4700 | const int offset, const int len)
4701 | {
4702 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4702, "len >= 0" ))));
4703 | return bytes_to_str(allocator, ensure_contiguous(tvb, offset, len), len)bytes_to_str_maxlen(allocator, ensure_contiguous(tvb, offset, len), len, 36);
4704 | }
4705 |
4706 | /* Find a needle tvbuff within a haystack tvbuff. */
4707 | int
4708 | tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const int haystack_offset)
4709 | {
4710 | unsigned haystack_abs_offset = 0, haystack_abs_length = 0;
4711 | const uint8_t *haystack_data;
4712 | const uint8_t *needle_data;
4713 | const unsigned needle_len = needle_tvb->length;
4714 | const uint8_t *location;
4715 |
4716 | 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", 4716, "haystack_tvb && haystack_tvb->initialized" ))));
4717 |
4718 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
4719 | return -1;
4720 | }
4721 |
4722 | /* Get pointers to the tvbuffs' data. */
4723 | haystack_data = ensure_contiguous(haystack_tvb, 0, -1);
4724 | needle_data = ensure_contiguous(needle_tvb, 0, -1);
4725 |
4726 | check_offset_length(haystack_tvb, haystack_offset, -1,
4727 | &haystack_abs_offset, &haystack_abs_length);
4728 |
4729 | location = ws_memmem(haystack_data + haystack_abs_offset, haystack_abs_length,
4730 | needle_data, needle_len);
4731 |
4732 | if (location) {
4733 | return (int) (location - haystack_data);
4734 | }
4735 |
4736 | return -1;
4737 | }
4738 |
4739 | int
4740 | tvb_raw_offset(tvbuff_t *tvb)
4741 | {
4742 | return ((tvb->raw_offset==-1) ? (tvb->raw_offset = tvb_offset_from_real_beginning(tvb)) : tvb->raw_offset);
4743 | }
4744 |
4745 | void
4746 | tvb_set_fragment(tvbuff_t *tvb)
4747 | {
4748 | tvb->flags |= TVBUFF_FRAGMENT0x00000001;
4749 | }
4750 |
4751 | struct tvbuff *
4752 | tvb_get_ds_tvb(tvbuff_t *tvb)
4753 | {
4754 | return(tvb->ds_tvb);
4755 | }
4756 |
4757 | unsigned
4758 | tvb_get_varint(tvbuff_t *tvb, unsigned offset, unsigned maxlen, uint64_t *value, const unsigned encoding)
4759 | {
4760 | *value = 0;
4761 |
4762 | switch (encoding & ENC_VARINT_MASK(0x00000002|0x00000004|0x00000008|0x00000010)) {
4763 | case ENC_VARINT_PROTOBUF0x00000002:
4764 | {
4765 | unsigned i;
4766 | uint64_t b; /* current byte */
4767 |
4768 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4769 | b = tvb_get_uint8(tvb, offset++);
4770 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
4771 |
4772 | if (b < 0x80) {
4773 | /* end successfully because of last byte's msb(most significant bit) is zero */
4774 | return i + 1;
4775 | }
4776 | }
4777 | break;
4778 | }
4779 |
4780 | case ENC_VARINT_ZIGZAG0x00000008:
4781 | {
4782 | unsigned i;
4783 | uint64_t b; /* current byte */
4784 |
4785 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4786 | b = tvb_get_uint8(tvb, offset++);
4787 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
4788 |
4789 | if (b < 0x80) {
4790 | /* end successfully because of last byte's msb(most significant bit) is zero */
4791 | *value = (*value >> 1) ^ ((*value & 1) ? -1 : 0);
4792 | return i + 1;
4793 | }
4794 | }
4795 | break;
4796 | }
4797 |
4798 | case ENC_VARINT_SDNV0x00000010:
4799 | {
4800 | /* Decodes similar to protobuf but in MSByte order */
4801 | unsigned i;
4802 | uint64_t b; /* current byte */
4803 |
4804 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4805 | b = tvb_get_uint8(tvb, offset++);
4806 | if ((i == 9) && (*value >= UINT64_C(1)1UL<<(64-7))) {
4807 | // guaranteed overflow, not valid SDNV
4808 | return 0;
4809 | }
4810 | *value <<= 7;
4811 | *value |= (b & 0x7F); /* add lower 7 bits to val */
4812 |
4813 | if (b < 0x80) {
4814 | /* end successfully because of last byte's msb(most significant bit) is zero */
4815 | return i + 1;
4816 | }
4817 | }
4818 | break;
4819 | }
4820 |
4821 | case ENC_VARINT_QUIC0x00000004:
4822 | {
4823 | /* calculate variable length */
4824 | *value = tvb_get_uint8(tvb, offset);
4825 | switch((*value) >> 6) {
4826 | case 0: /* 0b00 => 1 byte length (6 bits Usable) */
4827 | (*value) &= 0x3F;
4828 | return 1;
4829 | case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
4830 | *value = tvb_get_ntohs(tvb, offset) & 0x3FFF;
4831 | return 2;
4832 | case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
4833 | *value = tvb_get_ntohl(tvb, offset) & 0x3FFFFFFF;
4834 | return 4;
4835 | case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
4836 | *value = tvb_get_ntoh64(tvb, offset) & UINT64_C(0x3FFFFFFFFFFFFFFF)0x3FFFFFFFFFFFFFFFUL;
4837 | return 8;
4838 | default: /* No Possible */
4839 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 4839, __func__, "assertion \"not reached\" failed");
4840 | break;
4841 | }
4842 | break;
4843 | }
4844 |
4845 | default:
4846 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 4846));
4847 | }
4848 |
4849 | return 0; /* 10 bytes scanned, but no bytes' msb is zero */
4850 | }
4851 |
4852 | /*
4853 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
4854 | *
4855 | * Local variables:
4856 | * c-basic-offset: 8
4857 | * tab-width: 8
4858 | * indent-tabs-mode: t
4859 | * End:
4860 | *
4861 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
4862 | * :indentSize=8:tabSize=8:noTabs=false:
4863 | */