### Bug Summary

File: | builds/wireshark/wireshark/epan/tvbuff.c
Warning: | line 589, column 10 Potential leak of memory pointed to by 'buf'

### 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/2026-01-29-100357-3623-1 -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 unsigned total_no_of_bits);
51 |
52 | static uint64_t
53 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const unsigned total_no_of_bits);
54 |
55 | static inline unsigned
56 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset);
57 |
58 | static inline const uint8_t*
59 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length);
60 |
61 | static inline const uint8_t*
62 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length);
63 |
64 | static inline uint8_t *
65 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length);
66 |
67 | tvbuff_t *
68 | tvb_new(const struct tvb_ops *ops)
69 | {
70 | tvbuff_t *tvb;
71 | size_t size = ops->tvb_size;
72 |
73 | ws_assert(size >= sizeof(*tvb))do { if ((1) && !(size >= sizeof(*tvb))) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 73, __func__, "assertion failed: %s" , "size >= sizeof(*tvb)"); } while (0);
74 |
75 | tvb = (tvbuff_t *) g_slice_alloc(size);
76 |
77 | tvb->next = NULL((void*)0);
78 | tvb->ops = ops;
79 | tvb->initialized = false0;
80 | tvb->flags = 0;
81 | tvb->length = 0;
82 | tvb->reported_length = 0;
83 | tvb->contained_length = 0;
84 | tvb->real_data = NULL((void*)0);
85 | tvb->raw_offset = 0;
86 | tvb->ds_tvb = NULL((void*)0);
87 |
88 | return tvb;
89 | }
90 |
91 | static void
92 | tvb_free_internal(tvbuff_t *tvb)
93 | {
94 | size_t size;
95 |
96 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 96, "tvb"))));
97 |
98 | if (tvb->ops->tvb_free)
99 | tvb->ops->tvb_free(tvb);
100 |
101 | size = tvb->ops->tvb_size;
102 |
103 | g_slice_free1(size, tvb);
104 | }
105 |
106 | /* XXX: just call tvb_free_chain();
107 | * Not removed so that existing dissectors using tvb_free() need not be changed.
108 | * I'd argue that existing calls to tvb_free() should have actually been
109 | * calls to tvb_free_chain() although the calls were OK as long as no
110 | * subsets, etc had been created on the tvb. */
111 | void
112 | tvb_free(tvbuff_t *tvb)
113 | {
114 | tvb_free_chain(tvb);
115 | }
116 |
117 | void
118 | tvb_free_chain(tvbuff_t *tvb)
119 | {
120 | tvbuff_t *next_tvb;
121 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 121, "tvb"))));
122 | while (tvb) {
123 | next_tvb = tvb->next;
124 | tvb_free_internal(tvb);
125 | tvb = next_tvb;
126 | }
127 | }
128 |
129 | tvbuff_t *
130 | tvb_new_chain(tvbuff_t *parent, tvbuff_t *backing)
131 | {
132 | tvbuff_t *tvb = tvb_new_proxy(backing);
133 |
134 | tvb_add_to_chain(parent, tvb);
135 | return tvb;
136 | }
137 |
138 | void
139 | tvb_add_to_chain(tvbuff_t *parent, tvbuff_t *child)
140 | {
141 | tvbuff_t *tmp;
142 |
143 | DISSECTOR_ASSERT(parent)((void) ((parent) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 143, "parent"))));
144 | DISSECTOR_ASSERT(child)((void) ((child) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 144, "child"))));
145 |
146 | while (child) {
147 | tmp = child;
148 | child = child->next;
149 |
150 | tmp->next = parent->next;
151 | parent->next = tmp;
152 | }
153 | }
154 |
155 | /*
156 | * Check whether that offset goes more than one byte past the
157 | * end of the buffer.
158 | *
159 | * If not, return 0; otherwise, return exception
160 | */
161 | static inline int
162 | validate_offset(const tvbuff_t *tvb, const unsigned abs_offset)
163 | {
164 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
165 | /* It's OK. */
166 | return 0;
167 | }
168 |
169 | /*
170 | * It's not OK, but why? Which boundaries is it
171 | * past?
172 | */
173 | if (abs_offset <= tvb->contained_length) {
174 | /*
175 | * It's past the captured length, but not past
176 | * the reported end of any parent tvbuffs from
177 | * which this is constructed, or the reported
178 | * end of this tvbuff, so it's out of bounds
179 | * solely because we're past the end of the
180 | * captured data.
181 | */
182 | return BoundsError1;
183 | }
184 |
185 | /*
186 | * There's some actual packet boundary, not just the
187 | * artificial boundary imposed by packet slicing, that
188 | * we're past.
189 | */
190 |
191 | if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
192 | /*
193 | * This tvbuff is the first fragment of a larger
194 | * packet that hasn't been reassembled, so we
195 | * assume that's the source of the problem - if
196 | * we'd reassembled the packet, we wouldn't have
197 | * gone past the end.
198 | *
199 | * That might not be true, but for at least
200 | * some forms of reassembly, such as IP
201 | * reassembly, you don't know how big the
202 | * reassembled packet is unless you reassemble
203 | * it, so, in those cases, we can't determine
204 | * whether we would have gone past the end
205 | * had we reassembled the packet.
206 | */
207 | return FragmentBoundsError4;
208 | }
209 |
210 | /* OK, we're not an unreassembled fragment (that we know of). */
211 | if (abs_offset <= tvb->reported_length) {
212 | /*
213 | * We're within the bounds of what this tvbuff
214 | * purportedly contains, based on some length
215 | * value, but we're not within the bounds of
216 | * something from which this tvbuff was
217 | * extracted, so that length value ran past
218 | * the end of some parent tvbuff.
219 | */
220 | return ContainedBoundsError2;
221 | }
222 |
223 | /*
224 | * OK, it looks as if we ran past the claimed length
225 | * of data.
226 | */
227 | return ReportedBoundsError3;
228 | }
229 |
230 | static inline int
231 | validate_offset_and_remaining(const tvbuff_t *tvb, const unsigned offset, unsigned *rem_len)
232 | {
233 | int exception;
234 |
235 | exception = validate_offset(tvb, offset);
236 | if (!exception)
237 | *rem_len = tvb->length - offset;
238 |
239 | return exception;
240 | }
241 |
242 | /* Returns integer indicating whether the given offset and the end offset
243 | * calculated from that offset and the given length are in bounds (0) or
244 | * not (exception number).
245 | * No exception is thrown; on success, we return 0, otherwise we return an
246 | * exception for the caller to throw if appropriate.
247 | *
248 | * N.B. - we return success (0), if the offset is positive and right
249 | * after the end of the tvbuff (i.e., equal to the length). We do this
250 | * so that a dissector constructing a subset tvbuff for the next protocol
251 | * will get a zero-length tvbuff, not an exception, if there's no data
252 | * left for the next protocol - we want the next protocol to be the one
253 | * that gets an exception, so the error is reported as an error in that
254 | * protocol rather than the containing protocol. */
255 | static inline int
256 | validate_offset_length_no_exception(const tvbuff_t *tvb,
257 | const unsigned offset, const unsigned length)
258 | {
259 | unsigned end_offset;
260 | int exception;
261 |
262 | /* Compute the offset */
263 | /* Since offset is unsigned, the only effect of validation is to throw
264 | * a possibly different exception if offset is outside the captured
265 | * bytes. E.g., offset could be outside the captured bytes but in the
266 | * reported length, but end_offset outside the reported length.
267 | * XXX - Which *is* the proper exception? Compare fast_ensure_contiguous
268 | * which only throws the exception related to the end offset.
269 | */
270 | exception = validate_offset(tvb, offset);
271 | if (exception)
272 | return exception;
273 |
274 | /*
275 | * Compute the offset of the first byte past the length,
276 | * checking for an overflow.
277 | */
278 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
279 | return BoundsError1;
280 |
281 | return validate_offset(tvb, end_offset);
282 | }
283 |
284 | /* Checks offset and length and throws an exception if
285 | * either is out of bounds. Sets integer ptrs to the new length. */
286 | static inline void
287 | validate_offset_length(const tvbuff_t *tvb,
288 | const unsigned offset, const unsigned length)
289 | {
290 | int exception;
291 |
292 | exception = validate_offset_length_no_exception(tvb, offset, length);
293 | if (exception)
294 | THROW(exception)except_throw(1, (exception), ((void*)0));
295 | }
296 |
297 | /* Internal function so that other translation units can use
298 | * validate_offset_length. */
299 | void
300 | tvb_validate_offset_length(const tvbuff_t *tvb,
301 | const unsigned offset, const unsigned length)
302 | {
303 | validate_offset_length(tvb, offset, length);
304 | }
305 |
306 | /* Internal function so that other translation units can use
307 | * validate_offset_and_remaining. This throws the exception
308 | * from validate_offset_and_remaining. */
309 | void
310 | tvb_validate_offset_and_remaining(const tvbuff_t *tvb,
311 | const unsigned offset, unsigned *rem_len)
312 | {
313 | int exception;
314 |
315 | exception = validate_offset_and_remaining(tvb, offset, rem_len);
316 | if (exception)
317 | THROW(exception)except_throw(1, (exception), ((void*)0));
318 | }
319 |
320 | /*
321 | * The same as validate_offset except this accepts negative offsets, meaning
322 | * relative to the end of (captured) length. (That it's captured, not reported,
323 | * length is one reason to deprecate signed offsets, #20103.)
324 | */
325 | static inline int
326 | compute_offset(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr)
327 | {
328 | if (offset >= 0) {
329 | /* Positive offset - relative to the beginning of the packet. */
330 | if (G_LIKELY((unsigned) offset <= tvb->length)((unsigned) offset <= tvb->length)) {
331 | *offset_ptr = offset;
332 | } else if ((unsigned) offset <= tvb->contained_length) {
333 | return BoundsError1;
334 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
335 | return FragmentBoundsError4;
336 | } else if ((unsigned) offset <= tvb->reported_length) {
337 | return ContainedBoundsError2;
338 | } else {
339 | return ReportedBoundsError3;
340 | }
341 | }
342 | else {
343 | /* Negative offset - relative to the end of the packet. */
344 | /* Prevent UB on 2's complement platforms. All tested compilers
345 | * (gcc, clang, MSVC) compile this to a single instruction on
346 | * x86, ARM, RISC-V, S390x, SPARC, etc. at -O1 and higher
347 | * according to godbolt.org. */
348 | unsigned abs_offset = ((unsigned)-(offset + 1)) + 1;
349 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
350 | *offset_ptr = tvb->length - abs_offset;
351 | } else if (abs_offset <= tvb->contained_length) {
352 | return BoundsError1;
353 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
354 | return FragmentBoundsError4;
355 | } else if (abs_offset <= tvb->reported_length) {
356 | return ContainedBoundsError2;
357 | } else {
358 | return ReportedBoundsError3;
359 | }
360 | }
361 |
362 | return 0;
363 | }
364 |
365 | static inline int
366 | compute_offset_and_remaining(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr, unsigned *rem_len)
367 | {
368 | int exception;
369 |
370 | exception = compute_offset(tvb, offset, offset_ptr);
371 | if (!exception)
372 | *rem_len = tvb->length - *offset_ptr;
373 |
374 | return exception;
375 | }
376 |
377 | /* Computes the absolute offset and length based on a possibly-negative offset
378 | * and a length that is possible -1 (which means "to the end of the data").
379 | * Returns integer indicating whether the offset is in bounds (0) or
380 | * not (exception number). The integer ptrs are modified with the new offset,
381 | * captured (available) length, and contained length (amount that's present
382 | * in the parent tvbuff based on its reported length).
383 | * No exception is thrown; on success, we return 0, otherwise we return an
384 | * exception for the caller to throw if appropriate.
385 | *
386 | * XXX - we return success (0), if the offset is positive and right
387 | * after the end of the tvbuff (i.e., equal to the length). We do this
388 | * so that a dissector constructing a subset tvbuff for the next protocol
389 | * will get a zero-length tvbuff, not an exception, if there's no data
390 | * left for the next protocol - we want the next protocol to be the one
391 | * that gets an exception, so the error is reported as an error in that
392 | * protocol rather than the containing protocol. */
393 | static inline int
394 | check_offset_length_no_exception(const tvbuff_t *tvb,
395 | const int offset, int const length_val,
396 | unsigned *offset_ptr, unsigned *length_ptr)
397 | {
398 | unsigned end_offset;
399 | int exception;
400 |
401 | DISSECTOR_ASSERT(offset_ptr)((void) ((offset_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 401, "offset_ptr" ))));
402 | DISSECTOR_ASSERT(length_ptr)((void) ((length_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 402, "length_ptr" ))));
403 |
404 | /* Compute the offset */
405 | exception = compute_offset(tvb, offset, offset_ptr);
406 | if (exception)
407 | return exception;
408 |
409 | if (length_val < -1) {
410 | /* XXX - ReportedBoundsError? */
411 | return BoundsError1;
412 | }
413 |
414 | /* Compute the length */
415 | if (length_val == -1)
416 | *length_ptr = tvb->length - *offset_ptr;
417 | else
418 | *length_ptr = length_val;
419 |
420 | /*
421 | * Compute the offset of the first byte past the length.
422 | */
423 | end_offset = *offset_ptr + *length_ptr;
424 |
425 | /*
426 | * Check for an overflow
427 | */
428 | if (end_offset < *offset_ptr)
429 | return BoundsError1;
430 |
431 | return validate_offset(tvb, end_offset);
432 | }
433 |
434 | /* Checks (+/-) offset and length and throws an exception if
435 | * either is out of bounds. Sets integer ptrs to the new offset
436 | * and length. */
437 | static inline void
438 | check_offset_length(const tvbuff_t *tvb,
439 | const int offset, int const length_val,
440 | unsigned *offset_ptr, unsigned *length_ptr)
441 | {
442 | int exception;
443 |
444 | exception = check_offset_length_no_exception(tvb, offset, length_val, offset_ptr, length_ptr);
445 | if (exception)
446 | THROW(exception)except_throw(1, (exception), ((void*)0));
447 | }
448 |
449 | /* Internal function so that other translation units can use
450 | * check_offset_length. */
451 | void
452 | tvb_check_offset_length(const tvbuff_t *tvb,
453 | const int offset, int const length_val,
454 | unsigned *offset_ptr, unsigned *length_ptr)
455 | {
456 | check_offset_length(tvb, offset, length_val, offset_ptr, length_ptr);
457 | }
458 |
459 | static const unsigned char left_aligned_bitmask[] = {
460 | 0xff,
461 | 0x80,
462 | 0xc0,
463 | 0xe0,
464 | 0xf0,
465 | 0xf8,
466 | 0xfc,
467 | 0xfe
468 | };
469 |
470 | /* tvb_new_octet_aligned used to support -1 no_of_bits as meaning "to the
471 | * end of the buffer." Nothing every used it. It could be supported with
472 | * a _remaining() function if necessary. Note that the previous implementation
473 | * didn't properly keep the extra reported length if the reported length
474 | * was greater than the captured length.
475 | */
476 |
477 | tvbuff_t *
478 | tvb_new_octet_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
479 | {
480 | tvbuff_t *sub_tvb = NULL((void*)0);
481 | uint32_t byte_offset;
482 | uint32_t datalen, i;
483 | uint8_t left, right, remaining_bits, *buf;
484 | const uint8_t *data;
485 |
486 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 486, "tvb && tvb->initialized" ))));
487 |
488 | byte_offset = bit_offset >> 3;
489 | left = bit_offset % 8; /* for left-shifting */
490 | right = 8 - left; /* for right-shifting */
491 |
492 | datalen = no_of_bits >> 3;
493 | remaining_bits = no_of_bits % 8;
494 | if (remaining_bits) {
495 | datalen++;
496 | }
497 |
498 | /* already aligned -> shortcut */
499 | if (((left == 0) && (remaining_bits == 0)) || datalen == 0) {
500 | return tvb_new_subset_length_caplen(tvb, byte_offset, datalen, datalen);
501 | }
502 |
503 | /* If at least one trailing byte is available, we must use the content
504 | * of that byte for the last shift (i.e. tvb_get_ptr() must use datalen + 1).
505 | * If no extra byte is available, the last shifted byte requires
506 | * special treatment.
507 | */
508 | if (_tvb_captured_length_remaining(tvb, byte_offset) > datalen) {
509 | data = ensure_contiguous_unsigned(tvb, byte_offset, datalen + 1); /* tvb_get_ptr */
510 |
511 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
512 | buf = (uint8_t *)g_malloc(datalen);
513 |
514 | /* shift tvb data bit_offset bits to the left */
515 | for (i = 0; i < datalen; i++)
516 | buf[i] = (data[i] << left) | (data[i+1] >> right);
517 | } else {
518 | data = ensure_contiguous_unsigned(tvb, byte_offset, datalen); /* tvb_get_ptr() */
519 |
520 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
521 | buf = (uint8_t *)g_malloc(datalen);
522 |
523 | /* shift tvb data bit_offset bits to the left */
524 | for (i = 0; i < (datalen-1); i++)
525 | buf[i] = (data[i] << left) | (data[i+1] >> right);
526 | buf[datalen-1] = data[datalen-1] << left; /* set last octet */
527 | }
528 | buf[datalen-1] &= left_aligned_bitmask[remaining_bits];
529 |
530 | sub_tvb = tvb_new_child_real_data(tvb, buf, datalen, datalen);
531 | tvb_set_free_cb(sub_tvb, g_free);
532 |
533 | return sub_tvb;
534 | }
535 |
536 | tvbuff_t *
537 | tvb_new_octet_right_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
538 | {
539 | tvbuff_t *sub_tvb = NULL((void*)0);
540 | uint32_t byte_offset;
541 | unsigned src_len, dst_len, i;
542 | uint8_t left, right, remaining_bits, *buf;
543 | const uint8_t *data;
544 |
545 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 545, "tvb && tvb->initialized" ))));
4 | ← | Assuming 'tvb' is non-null | →
5 | ← | Assuming field 'initialized' is true | →
6 | ← | '?' condition is true | →
546 |
547 | byte_offset = bit_offset / 8;
548 | /* right shift to put bits in place and discard least significant bits */
549 | right = bit_offset % 8;
550 | /* left shift to get most significant bits from next octet */
551 | left = 8 - right;
552 |
553 | dst_len = no_of_bits / 8;
554 | remaining_bits = no_of_bits % 8;
555 | if (remaining_bits) {
7 | ← | Assuming 'remaining_bits' is 0 | →
556 | dst_len++;
557 | }
558 |
559 | /* already aligned -> shortcut */
560 | if (((right == 0) && (remaining_bits == 0)) || dst_len == 0) {
8 | ← | Assuming 'right' is not equal to 0 | →
9 | ← | Assuming 'dst_len' is not equal to 0 | →
10 | ← | Taking false branch | →
561 | return tvb_new_subset_length_caplen(tvb, byte_offset, dst_len, dst_len);
562 | }
563 |
564 | if (_tvb_captured_length_remaining(tvb, byte_offset) > dst_len) {
11 | ← | Taking false branch | →
565 | /* last octet will get data from trailing octet */
566 | src_len = dst_len + 1;
567 | } else {
568 | /* last octet will be zero padded */
569 | src_len = dst_len;
570 | }
571 |
572 | data = ensure_contiguous_unsigned(tvb, byte_offset, src_len); /* tvb_get_ptr */
573 |
574 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
575 | buf = (uint8_t *)g_malloc(dst_len);
12 | ← | Memory is allocated | →
576 |
577 | for (i = 0; i < (dst_len - 1); i++)
13 | ← | Assuming the condition is false | →
14 | ← | Loop condition is false. Execution continues on line 581 | →
578 | buf[i] = (data[i] >> right) | (data[i+1] << left);
579 |
580 | /* Special handling for last octet */
581 | buf[i] = (data[i] >> right);
582 | /* Shift most significant bits from trailing octet if available */
583 | if (src_len
14.1 | 'src_len' is <= 'dst_len'
> dst_len)
15 | ← | Taking false branch | →
584 | buf[i] |= (data[i+1] << left);
585 | /* Preserve only remaining bits in last octet if not multiple of 8 */
586 | if (remaining_bits
15.1 | 'remaining_bits' is 0
)
16 | ← | Taking false branch | →
587 | buf[i] &= ((1 << remaining_bits) - 1);
588 |
589 | sub_tvb = tvb_new_child_real_data(tvb, buf, dst_len, dst_len);
17 | ← | Potential leak of memory pointed to by 'buf'
590 | tvb_set_free_cb(sub_tvb, g_free);
591 |
592 | return sub_tvb;
593 | }
594 |
595 | static tvbuff_t *
596 | tvb_generic_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
597 | {
598 | tvbuff_t *cloned_tvb;
599 | uint8_t *data;
600 |
601 | 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", 601, "tvb_bytes_exist(tvb, offset, len)" ))));
602 |
603 | data = (uint8_t *) g_malloc(len);
604 |
605 | tvb_memcpy(tvb, data, offset, len);
606 |
607 | cloned_tvb = tvb_new_real_data(data, len, len);
608 | tvb_set_free_cb(cloned_tvb, g_free);
609 |
610 | return cloned_tvb;
611 | }
612 |
613 | tvbuff_t *
614 | tvb_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
615 | {
616 | if (tvb->ops->tvb_clone) {
617 | tvbuff_t *cloned_tvb;
618 |
619 | cloned_tvb = tvb->ops->tvb_clone(tvb, offset, len);
620 | if (cloned_tvb)
621 | return cloned_tvb;
622 | }
623 |
624 | return tvb_generic_clone_offset_len(tvb, offset, len);
625 | }
626 |
627 | tvbuff_t *
628 | tvb_clone(tvbuff_t *tvb)
629 | {
630 | return tvb_clone_offset_len(tvb, 0, tvb->length);
631 | }
632 |
633 | inline unsigned
634 | tvb_captured_length(const tvbuff_t *tvb)
635 | {
636 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 636, "tvb && tvb->initialized" ))));
637 |
638 | return tvb->length;
639 | }
640 |
641 | /* For tvbuff internal use */
642 | static inline unsigned
643 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
644 | {
645 | unsigned rem_length;
646 | int exception;
647 |
648 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
649 | if (exception)
650 | return 0;
651 |
652 | return rem_length;
653 | }
654 |
655 | unsigned
656 | tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
657 | {
658 | unsigned rem_length;
659 | int exception;
660 |
661 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 661, "tvb && tvb->initialized" ))));
662 |
663 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
664 | if (exception)
665 | return 0;
666 |
667 | return rem_length;
668 | }
669 |
670 | unsigned
671 | tvb_ensure_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
672 | {
673 | unsigned rem_length = 0;
674 | int exception;
675 |
676 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 676, "tvb && tvb->initialized" ))));
677 |
678 | exception = validate_offset(tvb, offset);
679 | if (exception)
680 | THROW(exception)except_throw(1, (exception), ((void*)0));
681 |
682 | rem_length = tvb->length - offset;
683 |
684 | if (rem_length == 0) {
685 | /*
686 | * This routine ensures there's at least one byte available.
687 | * There aren't any bytes available, so throw the appropriate
688 | * exception.
689 | */
690 | if (offset < tvb->contained_length) {
691 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
692 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
693 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
694 | } else if (offset < tvb->reported_length) {
695 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
696 | } else {
697 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
698 | }
699 | }
700 | return rem_length;
701 | }
702 |
703 | /* Validates that 'length' bytes are available starting from
704 | * offset. Does not throw an exception. */
705 | bool_Bool
706 | tvb_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
707 | {
708 | unsigned end_offset;
709 |
710 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 710, "tvb && tvb->initialized" ))));
711 |
712 | /*
713 | * Negative lengths are not possible and indicate a bug (e.g. arithmetic
714 | * error or an overly large value from packet data).
715 | */
716 | if (length < 0)
717 | return false0;
718 |
719 | /*
720 | * Compute the offset of the first byte past the length.
721 | * Make sure it doesn't overflow.
722 | */
723 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
724 | return false0;
725 |
726 | /*
727 | * Check that bytes exist up to right before that offset. (As length is
728 | * positive and there was no overflow we don't need to check offset.)
729 | */
730 | if (end_offset > tvb->length)
731 | return false0;
732 |
733 | return true1;
734 | }
735 |
736 | /* Validates that 'length' bytes, where 'length' is a 64-bit unsigned
737 | * integer, are available starting from offset (pos/neg). Throws an
738 | * exception if they aren't. */
739 | void
740 | tvb_ensure_bytes_exist64(const tvbuff_t *tvb, const unsigned offset, const uint64_t length)
741 | {
742 | /*
743 | * Make sure the value fits in a signed integer; if not, assume
744 | * that means that it's too big.
745 | */
746 | if (length > INT_MAX2147483647) {
747 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
748 | }
749 |
750 | /* OK, now cast it and try it with tvb_ensure_bytes_exist(). */
751 | tvb_ensure_bytes_exist(tvb, offset, (int)length);
752 | }
753 |
754 | /* Validates that 'length' bytes are available starting from
755 | * offset (pos/neg). Throws an exception if they aren't. */
756 | /* coverity[ +tainted_data_sanitize : arg-1 ] */
757 | /* coverity[ +tainted_data_sanitize : arg-2 ] */
758 | void
759 | tvb_ensure_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
760 | {
761 | unsigned end_offset;
762 | int exception;
763 |
764 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 764, "tvb && tvb->initialized" ))));
765 |
766 | /*
767 | * -1 doesn't mean "until end of buffer", as that's pointless
768 | * for this routine. We must treat it as a Really Large Positive
769 | * Number, so that we throw an exception; we throw
770 | * ReportedBoundsError, as if it were past even the end of a
771 | * reassembled packet, and past the end of even the data we
772 | * didn't capture.
773 | *
774 | * We do the same with other negative lengths.
775 | */
776 | if (length < 0) {
777 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
778 | }
779 |
780 | exception = validate_offset(tvb, offset);
781 | if (exception)
782 | THROW(exception)except_throw(1, (exception), ((void*)0));
783 |
784 | /*
785 | * Compute the offset of the first byte past the length.
786 | */
787 | end_offset = offset + length;
788 |
789 | /*
790 | * Check for an overflow
791 | */
792 | if (end_offset < offset)
793 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
794 |
795 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length))
796 | return;
797 | else if (end_offset <= tvb->contained_length)
798 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
799 | else if (tvb->flags & TVBUFF_FRAGMENT0x00000001)
800 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
801 | else if (end_offset <= tvb->reported_length)
802 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
803 | else
804 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
805 | }
806 |
807 | bool_Bool
808 | tvb_offset_exists(const tvbuff_t *tvb, const unsigned offset)
809 | {
810 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 810, "tvb && tvb->initialized" ))));
811 |
812 | /* We don't care why the offset doesn't exist, and unlike some
813 | * other functions we don't accept an offset one past the end,
814 | * so we check ourselves... */
815 | return offset < tvb->length;
816 | }
817 |
818 | unsigned
819 | tvb_reported_length(const tvbuff_t *tvb)
820 | {
821 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 821, "tvb && tvb->initialized" ))));
822 |
823 | return tvb->reported_length;
824 | }
825 |
826 | unsigned
827 | tvb_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
828 | {
829 | int exception;
830 |
831 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 831, "tvb && tvb->initialized" ))));
832 |
833 | exception = validate_offset(tvb, offset);
834 | if (exception)
835 | return 0;
836 |
837 | if (tvb->reported_length >= offset)
838 | return tvb->reported_length - offset;
839 | else
840 | return 0;
841 | }
842 |
843 | unsigned
844 | tvb_ensure_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
845 | {
846 | int exception;
847 |
848 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 848, "tvb && tvb->initialized" ))));
849 |
850 | exception = validate_offset(tvb, offset);
851 | if (exception)
852 | THROW(exception)except_throw(1, (exception), ((void*)0));
853 |
854 | if (tvb->reported_length >= offset)
855 | return tvb->reported_length - offset;
856 | else
857 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
858 | }
859 |
860 | /* Set the reported length of a tvbuff to a given value; used for protocols
861 | * whose headers contain an explicit length and where the calling
862 | * dissector's payload may include padding as well as the packet for
863 | * this protocol.
864 | * Also adjusts the available and contained length. */
865 | void
866 | tvb_set_reported_length(tvbuff_t *tvb, const unsigned reported_length)
867 | {
868 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 868, "tvb && tvb->initialized" ))));
869 |
870 | if (reported_length > tvb->reported_length)
871 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
872 |
873 | tvb->reported_length = reported_length;
874 | if (reported_length < tvb->length)
875 | tvb->length = reported_length;
876 | if (reported_length < tvb->contained_length)
877 | tvb->contained_length = reported_length;
878 | }
879 |
880 | /* Repair a tvbuff where the captured length is greater than the
881 | * reported length; such a tvbuff makes no sense, as it's impossible
882 | * to capture more data than is in the packet.
883 | */
884 | void
885 | tvb_fix_reported_length(tvbuff_t *tvb)
886 | {
887 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 887, "tvb && tvb->initialized" ))));
888 | 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", 888, "tvb->reported_length < tvb->length" ))));
889 |
890 | tvb->reported_length = tvb->length;
891 | if (tvb->contained_length < tvb->length)
892 | tvb->contained_length = tvb->length;
893 | }
894 |
895 | unsigned
896 | tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const unsigned counter)
897 | {
898 | if (tvb->ops->tvb_offset)
899 | return tvb->ops->tvb_offset(tvb, counter);
900 |
901 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 901));
902 | return 0;
903 | }
904 |
905 | unsigned
906 | tvb_offset_from_real_beginning(const tvbuff_t *tvb)
907 | {
908 | return tvb_offset_from_real_beginning_counter(tvb, 0);
909 | }
910 |
911 | static inline const uint8_t*
912 | ensure_contiguous_unsigned_no_exception(tvbuff_t *tvb, const unsigned offset, const unsigned length, int *pexception)
913 | {
914 | int exception;
915 |
916 | exception = validate_offset_length_no_exception(tvb, offset, length);
917 | if (exception) {
918 | if (pexception)
919 | *pexception = exception;
920 | return NULL((void*)0);
921 | }
922 |
923 | /*
924 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
925 | * then it is acceptable to have an empty tvb (!tvb->real_data).
926 | */
927 | if (length == 0) {
928 | return NULL((void*)0);
929 | }
930 |
931 | /*
932 | * We know that all the data is present in the tvbuff, so
933 | * no exceptions should be thrown.
934 | */
935 | if (tvb->real_data)
936 | return tvb->real_data + offset;
937 |
938 | if (tvb->ops->tvb_get_ptr)
939 | return tvb->ops->tvb_get_ptr(tvb, offset, length);
940 |
941 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 941));
942 | return NULL((void*)0);
943 | }
944 |
945 | /* coverity[ +tainted_data_sanitize : arg-1 ] */
946 | /* coverity[ +tainted_data_sanitize : arg-2 ] */
947 | static inline const uint8_t*
948 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length)
949 | {
950 | int exception = 0;
951 | const uint8_t *p;
952 |
953 | p = ensure_contiguous_unsigned_no_exception(tvb, offset, length, &exception);
954 | if (p == NULL((void*)0) && length != 0) {
955 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 955, "exception > 0" ))));
956 | THROW(exception)except_throw(1, (exception), ((void*)0));
957 | }
958 | return p;
959 | }
960 |
961 | static inline const uint8_t*
962 | ensure_contiguous_no_exception(tvbuff_t *tvb, const int offset, const int length, int *pexception)
963 | {
964 | unsigned abs_offset = 0, abs_length = 0;
965 | int exception;
966 |
967 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length);
968 | if (exception) {
969 | if (pexception)
970 | *pexception = exception;
971 | return NULL((void*)0);
972 | }
973 |
974 | /*
975 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
976 | * then it is acceptable to have an empty tvb (!tvb->real_data).
977 | */
978 | if (length == 0) {
979 | return NULL((void*)0);
980 | }
981 |
982 | /*
983 | * We know that all the data is present in the tvbuff, so
984 | * no exceptions should be thrown.
985 | */
986 | if (tvb->real_data)
987 | return tvb->real_data + abs_offset;
988 |
989 | if (tvb->ops->tvb_get_ptr)
990 | return tvb->ops->tvb_get_ptr(tvb, abs_offset, abs_length);
991 |
992 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 992));
993 | return NULL((void*)0);
994 | }
995 |
996 | static inline const uint8_t*
997 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length)
998 | {
999 | int exception = 0;
1000 | const uint8_t *p;
1001 |
1002 | p = ensure_contiguous_no_exception(tvb, offset, length, &exception);
1003 | if (p == NULL((void*)0) && length != 0) {
1004 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1004, "exception > 0" ))));
1005 | THROW(exception)except_throw(1, (exception), ((void*)0));
1006 | }
1007 | return p;
1008 | }
1009 |
1010 | static inline const uint8_t*
1011 | fast_ensure_contiguous(tvbuff_t *tvb, const unsigned offset, const unsigned length)
1012 | {
1013 | unsigned end_offset;
1014 |
1015 | /* Since offset is unsigned, we have to check for overflow. */
1016 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1016, "tvb && tvb->initialized" ))));
1017 |
1018 | /* This is only called internally, never with zero. Try to satisfy
1019 | * Coverity that we don't run off the end. */
1020 | ws_assert(length != 0)do { if ((1) && !(length != 0)) ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 1020, __func__, "assertion failed: %s" , "length != 0"); } while (0);
1021 |
1022 | if (!tvb->real_data) {
1023 | return ensure_contiguous_unsigned(tvb, offset, length);
1024 | }
1025 |
1026 | /* XXX - Is this really faster now (other than the slight difference
1027 | * in behavior from only throwing the exception related to the end
1028 | * offset?) */
1029 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
1030 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1031 |
1032 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) {
1033 | return tvb->real_data + offset;
1034 | } else if (end_offset <= tvb->contained_length) {
1035 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1036 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
1037 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
1038 | } else if (end_offset <= tvb->reported_length) {
1039 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
1040 | } else {
1041 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
1042 | }
1043 | /* not reached */
1044 | return NULL((void*)0);
1045 | }
1046 |
1047 |
1048 |
1049 | /************** ACCESSORS **************/
1050 |
1051 | void *
1052 | tvb_memcpy(tvbuff_t *tvb, void *target, const unsigned offset, size_t length)
1053 | {
1054 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1054, "tvb && tvb->initialized" ))));
1055 |
1056 | /*
1057 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1058 | * only supports an unsigned.
1059 | */
1060 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1060, "length <= (2147483647 *2U +1U)" ))));
1061 | validate_offset_length(tvb, offset, (unsigned)length);
1062 |
1063 | if (target && tvb->real_data) {
1064 | return memcpy(target, tvb->real_data + offset, length);
1065 | }
1066 |
1067 | if (target && tvb->ops->tvb_memcpy)
1068 | return tvb->ops->tvb_memcpy(tvb, target, offset, (unsigned)length);
1069 |
1070 | /*
1071 | * If the length is 0, there's nothing to do.
1072 | * (tvb->real_data could be null if it's allocated with
1073 | * a size of length.)
1074 | */
1075 | if (length != 0) {
1076 | /*
1077 | * XXX, fallback to slower method
1078 | */
1079 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 1079));
1080 | }
1081 | return NULL((void*)0);
1082 | }
1083 |
1084 |
1085 | /*
1086 | * XXX - This could replace some code that calls "tvb_ensure_bytes_exist()"
1087 | * and then allocates a buffer and copies data to it.
1088 | *
1089 | * If scope is NULL, memory is allocated with g_malloc() and user must
1090 | * explicitly free it with g_free().
1091 | * If scope is not NULL, memory is allocated with the corresponding pool
1092 | * lifetime.
1093 | */
1094 | void *
1095 | tvb_memdup(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, size_t length)
1096 | {
1097 | void *duped;
1098 |
1099 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1099, "tvb && tvb->initialized" ))));
1100 |
1101 | /*
1102 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1103 | * only supports an unsigned.
1104 | */
1105 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1105, "length <= (2147483647 *2U +1U)" ))));
1106 | validate_offset_length(tvb, offset, (unsigned)length);
1107 |
1108 | if (length == 0)
1109 | return NULL((void*)0);
1110 |
1111 | duped = wmem_alloc(scope, length);
1112 | return tvb_memcpy(tvb, duped, offset, length);
1113 | }
1114 |
1115 | #if 0
1116 | /* XXX - Is a _remaining variant of this necessary? The user would still need
1117 | * to get the length from tvb_captured_length_remaining() to productively use
1118 | * the (not necessarily null terminated) byte array. See also tvb_get_ptr(),
1119 | * which is similar. */
1120 | void *
1121 | tvb_memdup_remaining(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset)
1122 | {
1123 | void *duped;
1124 | unsigned length;
1125 |
1126 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1126, "tvb && tvb->initialized" ))));
1127 |
1128 | validate_offset_and_remaining(tvb, offset, &length);
1129 |
1130 | if (length == 0)
1131 | return NULL((void*)0);
1132 |
1133 | duped = wmem_alloc(scope, length);
1134 | return tvb_memcpy(tvb, duped, offset, length);
1135 | }
1136 | #endif
1137 |
1138 | const uint8_t*
1139 | tvb_get_ptr(tvbuff_t *tvb, const unsigned offset, const unsigned length)
1140 | {
1141 | return ensure_contiguous_unsigned(tvb, offset, length);
1142 | }
1143 |
1144 | /* ---------------- */
1145 | uint8_t
1146 | tvb_get_uint8(tvbuff_t *tvb, const unsigned offset)
1147 | {
1148 | const uint8_t *ptr;
1149 |
1150 | ptr = fast_ensure_contiguous(tvb, offset, 1);
1151 | return *ptr;
1152 | }
1153 |
1154 | int8_t
1155 | tvb_get_int8(tvbuff_t *tvb, const unsigned offset)
1156 | {
1157 | const uint8_t *ptr;
1158 |
1159 | ptr = fast_ensure_contiguous(tvb, offset, 1);
1160 | return *ptr;
1161 | }
1162 |
1163 | uint16_t
1164 | tvb_get_ntohs(tvbuff_t *tvb, const unsigned offset)
1165 | {
1166 | const uint8_t *ptr;
1167 |
1168 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1169 | return pntohu16(ptr);
1170 | }
1171 |
1172 | int16_t
1173 | tvb_get_ntohis(tvbuff_t *tvb, const unsigned offset)
1174 | {
1175 | const uint8_t *ptr;
1176 |
1177 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1178 | return pntohu16(ptr);
1179 | }
1180 |
1181 | uint32_t
1182 | tvb_get_ntoh24(tvbuff_t *tvb, const unsigned offset)
1183 | {
1184 | const uint8_t *ptr;
1185 |
1186 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1187 | return pntohu24(ptr);
1188 | }
1189 |
1190 | int32_t
1191 | tvb_get_ntohi24(tvbuff_t *tvb, const unsigned offset)
1192 | {
1193 | uint32_t ret;
1194 |
1195 | ret = ws_sign_ext32(tvb_get_ntoh24(tvb, offset), 24);
1196 |
1197 | return (int32_t)ret;
1198 | }
1199 |
1200 | uint32_t
1201 | tvb_get_ntohl(tvbuff_t *tvb, const unsigned offset)
1202 | {
1203 | const uint8_t *ptr;
1204 |
1205 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1206 | return pntohu32(ptr);
1207 | }
1208 |
1209 | int32_t
1210 | tvb_get_ntohil(tvbuff_t *tvb, const unsigned offset)
1211 | {
1212 | const uint8_t *ptr;
1213 |
1214 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1215 | return pntohu32(ptr);
1216 | }
1217 |
1218 | uint64_t
1219 | tvb_get_ntoh40(tvbuff_t *tvb, const unsigned offset)
1220 | {
1221 | const uint8_t *ptr;
1222 |
1223 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1224 | return pntohu40(ptr);
1225 | }
1226 |
1227 | int64_t
1228 | tvb_get_ntohi40(tvbuff_t *tvb, const unsigned offset)
1229 | {
1230 | uint64_t ret;
1231 |
1232 | ret = ws_sign_ext64(tvb_get_ntoh40(tvb, offset), 40);
1233 |
1234 | return (int64_t)ret;
1235 | }
1236 |
1237 | uint64_t
1238 | tvb_get_ntoh48(tvbuff_t *tvb, const unsigned offset)
1239 | {
1240 | const uint8_t *ptr;
1241 |
1242 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1243 | return pntohu48(ptr);
1244 | }
1245 |
1246 | int64_t
1247 | tvb_get_ntohi48(tvbuff_t *tvb, const unsigned offset)
1248 | {
1249 | uint64_t ret;
1250 |
1251 | ret = ws_sign_ext64(tvb_get_ntoh48(tvb, offset), 48);
1252 |
1253 | return (int64_t)ret;
1254 | }
1255 |
1256 | uint64_t
1257 | tvb_get_ntoh56(tvbuff_t *tvb, const unsigned offset)
1258 | {
1259 | const uint8_t *ptr;
1260 |
1261 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1262 | return pntohu56(ptr);
1263 | }
1264 |
1265 | int64_t
1266 | tvb_get_ntohi56(tvbuff_t *tvb, const unsigned offset)
1267 | {
1268 | uint64_t ret;
1269 |
1270 | ret = ws_sign_ext64(tvb_get_ntoh56(tvb, offset), 56);
1271 |
1272 | return (int64_t)ret;
1273 | }
1274 |
1275 | uint64_t
1276 | tvb_get_ntoh64(tvbuff_t *tvb, const unsigned offset)
1277 | {
1278 | const uint8_t *ptr;
1279 |
1280 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1281 | return pntohu64(ptr);
1282 | }
1283 |
1284 | int64_t
1285 | tvb_get_ntohi64(tvbuff_t *tvb, const unsigned offset)
1286 | {
1287 | const uint8_t *ptr;
1288 |
1289 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1290 | return pntohu64(ptr);
1291 | }
1292 |
1293 | uint16_t
1294 | tvb_get_uint16(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1295 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1296 | return tvb_get_letohs(tvb, offset);
1297 | } else {
1298 | return tvb_get_ntohs(tvb, offset);
1299 | }
1300 | }
1301 |
1302 | int16_t
1303 | tvb_get_int16(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1304 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1305 | return tvb_get_letohis(tvb, offset);
1306 | } else {
1307 | return tvb_get_ntohis(tvb, offset);
1308 | }
1309 | }
1310 |
1311 | uint32_t
1312 | tvb_get_uint24(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1313 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1314 | return tvb_get_letoh24(tvb, offset);
1315 | } else {
1316 | return tvb_get_ntoh24(tvb, offset);
1317 | }
1318 | }
1319 |
1320 | int32_t
1321 | tvb_get_int24(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1322 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1323 | return tvb_get_letohi24(tvb, offset);
1324 | } else {
1325 | return tvb_get_ntohi24(tvb, offset);
1326 | }
1327 | }
1328 |
1329 | uint32_t
1330 | tvb_get_uint32(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1331 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1332 | return tvb_get_letohl(tvb, offset);
1333 | } else {
1334 | return tvb_get_ntohl(tvb, offset);
1335 | }
1336 | }
1337 |
1338 | int32_t
1339 | tvb_get_int32(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1340 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1341 | return tvb_get_letohil(tvb, offset);
1342 | } else {
1343 | return tvb_get_ntohil(tvb, offset);
1344 | }
1345 | }
1346 |
1347 | uint64_t
1348 | tvb_get_uint40(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1349 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1350 | return tvb_get_letoh40(tvb, offset);
1351 | } else {
1352 | return tvb_get_ntoh40(tvb, offset);
1353 | }
1354 | }
1355 |
1356 | int64_t
1357 | tvb_get_int40(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1358 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1359 | return tvb_get_letohi40(tvb, offset);
1360 | } else {
1361 | return tvb_get_ntohi40(tvb, offset);
1362 | }
1363 | }
1364 |
1365 | uint64_t
1366 | tvb_get_uint48(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1367 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1368 | return tvb_get_letoh48(tvb, offset);
1369 | } else {
1370 | return tvb_get_ntoh48(tvb, offset);
1371 | }
1372 | }
1373 |
1374 | int64_t
1375 | tvb_get_int48(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1376 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1377 | return tvb_get_letohi48(tvb, offset);
1378 | } else {
1379 | return tvb_get_ntohi48(tvb, offset);
1380 | }
1381 | }
1382 |
1383 | uint64_t
1384 | tvb_get_uint56(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1385 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1386 | return tvb_get_letoh56(tvb, offset);
1387 | } else {
1388 | return tvb_get_ntoh56(tvb, offset);
1389 | }
1390 | }
1391 |
1392 | int64_t
1393 | tvb_get_int56(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1394 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1395 | return tvb_get_letohi56(tvb, offset);
1396 | } else {
1397 | return tvb_get_ntohi56(tvb, offset);
1398 | }
1399 | }
1400 |
1401 | uint64_t
1402 | tvb_get_uint64(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1403 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1404 | return tvb_get_letoh64(tvb, offset);
1405 | } else {
1406 | return tvb_get_ntoh64(tvb, offset);
1407 | }
1408 | }
1409 |
1410 | uint64_t
1411 | tvb_get_uint64_with_length(tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
1412 | {
1413 | uint64_t value;
1414 |
1415 | switch (length) {
1416 |
1417 | case 1:
1418 | value = tvb_get_uint8(tvb, offset);
1419 | break;
1420 |
1421 | case 2:
1422 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohs(tvb, offset)
1423 | : tvb_get_ntohs(tvb, offset);
1424 | break;
1425 |
1426 | case 3:
1427 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh24(tvb, offset)
1428 | : tvb_get_ntoh24(tvb, offset);
1429 | break;
1430 |
1431 | case 4:
1432 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohl(tvb, offset)
1433 | : tvb_get_ntohl(tvb, offset);
1434 | break;
1435 |
1436 | case 5:
1437 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh40(tvb, offset)
1438 | : tvb_get_ntoh40(tvb, offset);
1439 | break;
1440 |
1441 | case 6:
1442 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh48(tvb, offset)
1443 | : tvb_get_ntoh48(tvb, offset);
1444 | break;
1445 |
1446 | case 7:
1447 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh56(tvb, offset)
1448 | : tvb_get_ntoh56(tvb, offset);
1449 | break;
1450 |
1451 | case 8:
1452 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1453 | : tvb_get_ntoh64(tvb, offset);
1454 | break;
1455 |
1456 | default:
1457 | if (length < 1) {
1458 | value = 0;
1459 | } else {
1460 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1461 | : tvb_get_ntoh64(tvb, offset);
1462 | }
1463 | break;
1464 | }
1465 | return value;
1466 | }
1467 |
1468 | int64_t
1469 | tvb_get_int64(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1470 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1471 | return tvb_get_letohi64(tvb, offset);
1472 | } else {
1473 | return tvb_get_ntohi64(tvb, offset);
1474 | }
1475 | }
1476 |
1477 | float
1478 | tvb_get_ieee_float(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1479 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1480 | return tvb_get_letohieee_float(tvb, offset);
1481 | } else {
1482 | return tvb_get_ntohieee_float(tvb, offset);
1483 | }
1484 | }
1485 |
1486 | double
1487 | tvb_get_ieee_double(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1488 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1489 | return tvb_get_letohieee_double(tvb, offset);
1490 | } else {
1491 | return tvb_get_ntohieee_double(tvb, offset);
1492 | }
1493 | }
1494 |
1495 | /*
1496 | * Stuff for IEEE float handling on platforms that don't have IEEE
1497 | * format as the native floating-point format.
1498 | *
1499 | * For now, we treat only the VAX as such a platform.
1500 | *
1501 | * XXX - other non-IEEE boxes that can run UN*X include some Crays,
1502 | * and possibly other machines. However, I don't know whether there
1503 | * are any other machines that could run Wireshark and that don't use
1504 | * IEEE format. As far as I know, all of the main current and past
1505 | * commercial microprocessor families on which OSes that support
1506 | * Wireshark can run use IEEE format (x86, ARM, 68k, SPARC, MIPS,
1507 | * PA-RISC, Alpha, IA-64, and so on), and it appears that the official
1508 | * Linux port to System/390 and zArchitecture uses IEEE format floating-
1509 | * point rather than IBM hex floating-point (not a huge surprise), so
1510 | * I'm not sure that leaves any 32-bit or larger UN*X or Windows boxes,
1511 | * other than VAXes, that don't use IEEE format. If you're not running
1512 | * UN*X or Windows, the floating-point format is probably going to be
1513 | * the least of your problems in a port.
1514 | */
1515 |
1516 | #if defined(vax)
1517 |
1518 | #include <math.h>
1519 |
1520 | /*
1521 | * Single-precision.
1522 | */
1523 | #define IEEE_SP_NUMBER_WIDTH 32 /* bits in number */
1524 | #define IEEE_SP_EXP_WIDTH 8 /* bits in exponent */
1525 | #define IEEE_SP_MANTISSA_WIDTH 23 /* IEEE_SP_NUMBER_WIDTH - 1 - IEEE_SP_EXP_WIDTH */
1526 |
1527 | #define IEEE_SP_SIGN_MASK 0x80000000
1528 | #define IEEE_SP_EXPONENT_MASK 0x7F800000
1529 | #define IEEE_SP_MANTISSA_MASK 0x007FFFFF
1530 | #define IEEE_SP_INFINITY IEEE_SP_EXPONENT_MASK
1531 |
1532 | #define IEEE_SP_IMPLIED_BIT (1 << IEEE_SP_MANTISSA_WIDTH)
1533 | #define IEEE_SP_INFINITE ((1 << IEEE_SP_EXP_WIDTH) - 1)
1534 | #define IEEE_SP_BIAS ((1 << (IEEE_SP_EXP_WIDTH - 1)) - 1)
1535 |
1536 | static int
1537 | ieee_float_is_zero(const uint32_t w)
1538 | {
1539 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1540 | }
1541 |
1542 | static float
1543 | get_ieee_float(const uint32_t w)
1544 | {
1545 | long sign;
1546 | long exponent;
1547 | long mantissa;
1548 |
1549 | sign = w & IEEE_SP_SIGN_MASK;
1550 | exponent = w & IEEE_SP_EXPONENT_MASK;
1551 | mantissa = w & IEEE_SP_MANTISSA_MASK;
1552 |
1553 | if (ieee_float_is_zero(w)) {
1554 | /* number is zero, unnormalized, or not-a-number */
1555 | return 0.0;
1556 | }
1557 | #if 0
1558 | /*
1559 | * XXX - how to handle this?
1560 | */
1561 | if (IEEE_SP_INFINITY == exponent) {
1562 | /*
1563 | * number is positive or negative infinity, or a special value
1564 | */
1565 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1566 | }
1567 | #endif
1568 |
1569 | exponent = ((exponent >> IEEE_SP_MANTISSA_WIDTH) - IEEE_SP_BIAS) -
1570 | IEEE_SP_MANTISSA_WIDTH;
1571 | mantissa |= IEEE_SP_IMPLIED_BIT;
1572 |
1573 | if (sign)
1574 | return -mantissa * pow(2, exponent);
1575 | else
1576 | return mantissa * pow(2, exponent);
1577 | }
1578 |
1579 | /*
1580 | * Double-precision.
1581 | * We assume that if you don't have IEEE floating-point, you have a
1582 | * compiler that understands 64-bit integral quantities.
1583 | */
1584 | #define IEEE_DP_NUMBER_WIDTH 64 /* bits in number */
1585 | #define IEEE_DP_EXP_WIDTH 11 /* bits in exponent */
1586 | #define IEEE_DP_MANTISSA_WIDTH 52 /* IEEE_DP_NUMBER_WIDTH - 1 - IEEE_DP_EXP_WIDTH */
1587 |
1588 | #define IEEE_DP_SIGN_MASK INT64_C(0x8000000000000000)0x8000000000000000L
1589 | #define IEEE_DP_EXPONENT_MASK INT64_C(0x7FF0000000000000)0x7FF0000000000000L
1590 | #define IEEE_DP_MANTISSA_MASK INT64_C(0x000FFFFFFFFFFFFF)0x000FFFFFFFFFFFFFL
1591 | #define IEEE_DP_INFINITY IEEE_DP_EXPONENT_MASK
1592 |
1593 | #define IEEE_DP_IMPLIED_BIT (INT64_C(1)1L << IEEE_DP_MANTISSA_WIDTH)
1594 | #define IEEE_DP_INFINITE ((1 << IEEE_DP_EXP_WIDTH) - 1)
1595 | #define IEEE_DP_BIAS ((1 << (IEEE_DP_EXP_WIDTH - 1)) - 1)
1596 |
1597 | static int
1598 | ieee_double_is_zero(const uint64_t w)
1599 | {
1600 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1601 | }
1602 |
1603 | static double
1604 | get_ieee_double(const uint64_t w)
1605 | {
1606 | int64_t sign;
1607 | int64_t exponent;
1608 | int64_t mantissa;
1609 |
1610 | sign = w & IEEE_DP_SIGN_MASK;
1611 | exponent = w & IEEE_DP_EXPONENT_MASK;
1612 | mantissa = w & IEEE_DP_MANTISSA_MASK;
1613 |
1614 | if (ieee_double_is_zero(w)) {
1615 | /* number is zero, unnormalized, or not-a-number */
1616 | return 0.0;
1617 | }
1618 | #if 0
1619 | /*
1620 | * XXX - how to handle this?
1621 | */
1622 | if (IEEE_DP_INFINITY == exponent) {
1623 | /*
1624 | * number is positive or negative infinity, or a special value
1625 | */
1626 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1627 | }
1628 | #endif
1629 |
1630 | exponent = ((exponent >> IEEE_DP_MANTISSA_WIDTH) - IEEE_DP_BIAS) -
1631 | IEEE_DP_MANTISSA_WIDTH;
1632 | mantissa |= IEEE_DP_IMPLIED_BIT;
1633 |
1634 | if (sign)
1635 | return -mantissa * pow(2, exponent);
1636 | else
1637 | return mantissa * pow(2, exponent);
1638 | }
1639 | #endif
1640 |
1641 | /*
1642 | * Fetches an IEEE single-precision floating-point number, in
1643 | * big-endian form, and returns a "float".
1644 | *
1645 | * XXX - should this be "double", in case there are IEEE single-
1646 | * precision numbers that won't fit in some platform's native
1647 | * "float" format?
1648 | */
1649 | float
1650 | tvb_get_ntohieee_float(tvbuff_t *tvb, const unsigned offset)
1651 | {
1652 | #if defined(vax)
1653 | return get_ieee_float(tvb_get_ntohl(tvb, offset));
1654 | #else
1655 | union {
1656 | float f;
1657 | uint32_t w;
1658 | } ieee_fp_union;
1659 |
1660 | ieee_fp_union.w = tvb_get_ntohl(tvb, offset);
1661 | return ieee_fp_union.f;
1662 | #endif
1663 | }
1664 |
1665 | /*
1666 | * Fetches an IEEE double-precision floating-point number, in
1667 | * big-endian form, and returns a "double".
1668 | */
1669 | double
1670 | tvb_get_ntohieee_double(tvbuff_t *tvb, const unsigned offset)
1671 | {
1672 | #if defined(vax)
1673 | union {
1674 | uint32_t w[2];
1675 | uint64_t dw;
1676 | } ieee_fp_union;
1677 | #else
1678 | union {
1679 | double d;
1680 | uint32_t w[2];
1681 | } ieee_fp_union;
1682 | #endif
1683 |
1684 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1685 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset);
1686 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset+4);
1687 | #else
1688 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset+4);
1689 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset);
1690 | #endif
1691 | #if defined(vax)
1692 | return get_ieee_double(ieee_fp_union.dw);
1693 | #else
1694 | return ieee_fp_union.d;
1695 | #endif
1696 | }
1697 |
1698 | uint16_t
1699 | tvb_get_letohs(tvbuff_t *tvb, const unsigned offset)
1700 | {
1701 | const uint8_t *ptr;
1702 |
1703 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1704 | return pletohu16(ptr);
1705 | }
1706 |
1707 | int16_t
1708 | tvb_get_letohis(tvbuff_t *tvb, const unsigned offset)
1709 | {
1710 | const uint8_t *ptr;
1711 |
1712 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1713 | return pletohu16(ptr);
1714 | }
1715 |
1716 | uint32_t
1717 | tvb_get_letoh24(tvbuff_t *tvb, const unsigned offset)
1718 | {
1719 | const uint8_t *ptr;
1720 |
1721 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1722 | return pletohu24(ptr);
1723 | }
1724 |
1725 | int32_t
1726 | tvb_get_letohi24(tvbuff_t *tvb, const unsigned offset)
1727 | {
1728 | uint32_t ret;
1729 |
1730 | ret = ws_sign_ext32(tvb_get_letoh24(tvb, offset), 24);
1731 |
1732 | return (int32_t)ret;
1733 | }
1734 |
1735 | uint32_t
1736 | tvb_get_letohl(tvbuff_t *tvb, const unsigned offset)
1737 | {
1738 | const uint8_t *ptr;
1739 |
1740 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1741 | return pletohu32(ptr);
1742 | }
1743 |
1744 | int32_t
1745 | tvb_get_letohil(tvbuff_t *tvb, const unsigned offset)
1746 | {
1747 | const uint8_t *ptr;
1748 |
1749 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1750 | return pletohu32(ptr);
1751 | }
1752 |
1753 | uint64_t
1754 | tvb_get_letoh40(tvbuff_t *tvb, const unsigned offset)
1755 | {
1756 | const uint8_t *ptr;
1757 |
1758 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1759 | return pletohu40(ptr);
1760 | }
1761 |
1762 | int64_t
1763 | tvb_get_letohi40(tvbuff_t *tvb, const unsigned offset)
1764 | {
1765 | uint64_t ret;
1766 |
1767 | ret = ws_sign_ext64(tvb_get_letoh40(tvb, offset), 40);
1768 |
1769 | return (int64_t)ret;
1770 | }
1771 |
1772 | uint64_t
1773 | tvb_get_letoh48(tvbuff_t *tvb, const unsigned offset)
1774 | {
1775 | const uint8_t *ptr;
1776 |
1777 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1778 | return pletohu48(ptr);
1779 | }
1780 |
1781 | int64_t
1782 | tvb_get_letohi48(tvbuff_t *tvb, const unsigned offset)
1783 | {
1784 | uint64_t ret;
1785 |
1786 | ret = ws_sign_ext64(tvb_get_letoh48(tvb, offset), 48);
1787 |
1788 | return (int64_t)ret;
1789 | }
1790 |
1791 | uint64_t
1792 | tvb_get_letoh56(tvbuff_t *tvb, const unsigned offset)
1793 | {
1794 | const uint8_t *ptr;
1795 |
1796 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1797 | return pletohu56(ptr);
1798 | }
1799 |
1800 | int64_t
1801 | tvb_get_letohi56(tvbuff_t *tvb, const unsigned offset)
1802 | {
1803 | uint64_t ret;
1804 |
1805 | ret = ws_sign_ext64(tvb_get_letoh56(tvb, offset), 56);
1806 |
1807 | return (int64_t)ret;
1808 | }
1809 |
1810 | uint64_t
1811 | tvb_get_letoh64(tvbuff_t *tvb, const unsigned offset)
1812 | {
1813 | const uint8_t *ptr;
1814 |
1815 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1816 | return pletohu64(ptr);
1817 | }
1818 |
1819 | int64_t
1820 | tvb_get_letohi64(tvbuff_t *tvb, const unsigned offset)
1821 | {
1822 | const uint8_t *ptr;
1823 |
1824 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1825 | return pletohu64(ptr);
1826 | }
1827 |
1828 | /*
1829 | * Fetches an IEEE single-precision floating-point number, in
1830 | * little-endian form, and returns a "float".
1831 | *
1832 | * XXX - should this be "double", in case there are IEEE single-
1833 | * precision numbers that won't fit in some platform's native
1834 | * "float" format?
1835 | */
1836 | float
1837 | tvb_get_letohieee_float(tvbuff_t *tvb, const unsigned offset)
1838 | {
1839 | #if defined(vax)
1840 | return get_ieee_float(tvb_get_letohl(tvb, offset));
1841 | #else
1842 | union {
1843 | float f;
1844 | uint32_t w;
1845 | } ieee_fp_union;
1846 |
1847 | ieee_fp_union.w = tvb_get_letohl(tvb, offset);
1848 | return ieee_fp_union.f;
1849 | #endif
1850 | }
1851 |
1852 | /*
1853 | * Fetches an IEEE double-precision floating-point number, in
1854 | * little-endian form, and returns a "double".
1855 | */
1856 | double
1857 | tvb_get_letohieee_double(tvbuff_t *tvb, const unsigned offset)
1858 | {
1859 | #if defined(vax)
1860 | union {
1861 | uint32_t w[2];
1862 | uint64_t dw;
1863 | } ieee_fp_union;
1864 | #else
1865 | union {
1866 | double d;
1867 | uint32_t w[2];
1868 | } ieee_fp_union;
1869 | #endif
1870 |
1871 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1872 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset+4);
1873 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset);
1874 | #else
1875 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset);
1876 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset+4);
1877 | #endif
1878 | #if defined(vax)
1879 | return get_ieee_double(ieee_fp_union.dw);
1880 | #else
1881 | return ieee_fp_union.d;
1882 | #endif
1883 | }
1884 |
1885 | /* This function is a slight misnomer. It accepts all encodings that are
1886 | * ASCII "enough", which means encodings that are the same as US-ASCII
1887 | * for textual representations of dates and hex bytes; i.e., the same
1888 | * for the hex digits and Z (in practice, all alphanumerics), and the
1889 | * four separators ':' '-' '.' and ' '
1890 | * That means that any encoding that keeps the ISO/IEC 646 invariant
1891 | * characters the same (including the T.61 8 bit encoding and multibyte
1892 | * encodings like EUC-KR and GB18030) are OK, even if they replace characters
1893 | * like '$' '#' and '\' with national variants, but not encodings like UTF-16
1894 | * that include extra null bytes.
1895 | * For our current purposes, the unpacked GSM 7-bit default alphabet (but not
1896 | * all National Language Shift Tables) also satisfies this requirement, but
1897 | * note that it does *not* keep all ISO/IEC 646 invariant characters the same.
1898 | * If this internal function gets used for additional purposes than currently,
1899 | * the set of encodings that it accepts could change.
1900 | * */
1901 | static inline void
1902 | validate_single_byte_ascii_encoding(const unsigned encoding)
1903 | {
1904 | const unsigned enc = encoding & ~ENC_CHARENCODING_MASK0x0000FFFE;
1905 |
1906 | switch (enc) {
1907 | case ENC_UTF_160x00000004:
1908 | case ENC_UCS_20x00000006:
1909 | case ENC_UCS_40x00000008:
1910 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
1911 | case ENC_ASCII_7BITS0x00000034:
1912 | case ENC_EBCDIC0x0000002E:
1913 | case ENC_EBCDIC_CP0370x00000038:
1914 | case ENC_EBCDIC_CP5000x00000060:
1915 | case ENC_BCD_DIGITS_0_90x00000044:
1916 | case ENC_KEYPAD_ABC_TBCD0x00000046:
1917 | case ENC_KEYPAD_BC_TBCD0x00000048:
1918 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
1919 | case ENC_APN_STR0x00000054:
1920 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
1921 | 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" );
1922 | break;
1923 | default:
1924 | break;
1925 | }
1926 | /* make sure something valid was set */
1927 | if (enc == 0)
1928 | 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" );
1929 | }
1930 |
1931 | GByteArray*
1932 | tvb_get_string_bytes(tvbuff_t *tvb, const unsigned offset, const unsigned length,
1933 | const unsigned encoding, GByteArray *bytes, unsigned *endoff)
1934 | {
1935 | char *ptr;
1936 | const char *begin;
1937 | const char *end = NULL((void*)0);
1938 | GByteArray *retval = NULL((void*)0);
1939 |
1940 | validate_single_byte_ascii_encoding(encoding);
1941 |
1942 | ptr = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1943 | begin = ptr;
1944 |
1945 | if (endoff) *endoff = offset;
1946 |
1947 | while (*begin == ' ') begin++;
1948 |
1949 | if (*begin && bytes) {
1950 | if (hex_str_to_bytes_encoding(begin, bytes, &end, encoding, false0)) {
1951 | if (bytes->len > 0) {
1952 | if (endoff) *endoff = offset + (unsigned)(end - ptr);
1953 | retval = bytes;
1954 | }
1955 | }
1956 | }
1957 |
1958 | wmem_free(NULL((void*)0), ptr);
1959 |
1960 | return retval;
1961 | }
1962 |
1963 | static bool_Bool
1964 | parse_month_name(const char *name, int *tm_mon)
1965 | {
1966 | static const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May",
1967 | "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1968 | for (int i = 0; i < 12; i++) {
1969 | if (memcmp(months[i], name, 4) == 0) {
1970 | *tm_mon = i;
1971 | return true1;
1972 | }
1973 | }
1974 | return false0;
1975 | }
1976 |
1977 | /*
1978 | * Is the character a WSP character, as per RFC 5234? (space or tab).
1979 | */
1980 | #define IS_WSP(c)((c) == ' ' || (c) == '\t') ((c) == ' ' || (c) == '\t')
1981 |
1982 | /* support hex-encoded time values? */
1983 | nstime_t*
1984 | tvb_get_string_time(tvbuff_t *tvb, const unsigned offset, const unsigned length,
1985 | const unsigned encoding, nstime_t *ns, unsigned *endoff)
1986 | {
1987 | char *begin;
1988 | const char *ptr;
1989 | const char *end = NULL((void*)0);
1990 | int num_chars = 0;
1991 | int utc_offset = 0;
1992 |
1993 | validate_single_byte_ascii_encoding(encoding);
1994 |
1995 | DISSECTOR_ASSERT(ns)((void) ((ns) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 1995, "ns"))));
1996 |
1997 | begin = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1998 | ptr = begin;
1999 |
2000 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2001 | ptr++;
2002 |
2003 | if (*ptr) {
2004 | if ((encoding & ENC_ISO_8601_DATE_TIME0x00030000) == ENC_ISO_8601_DATE_TIME0x00030000) {
2005 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME))) {
2006 |
2007 |
2008 | goto fail;
2009 | }
2010 | } else if ((encoding & ENC_ISO_8601_DATE_TIME_BASIC0x00100000) == ENC_ISO_8601_DATE_TIME_BASIC0x00100000) {
2011 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME_BASIC))) {
2012 |
2013 |
2014 | goto fail;
2015 | }
2016 | } else {
2017 | struct tm tm;
2018 |
2019 | memset(&tm, 0, sizeof(tm));
2020 | tm.tm_isdst = -1;
2021 | ns->secs = 0;
2022 | ns->nsecs = 0;
2023 |
2024 | /* note: sscanf is known to be inconsistent across platforms with respect
2025 | to whether a %n is counted as a return value or not, so we have to use
2026 | '>=' a lot */
2027 | if (encoding & ENC_ISO_8601_DATE0x00010000) {
2028 | /* 2014-04-07 */
2029 | if (sscanf(ptr, "%d-%d-%d%n",
2030 | &tm.tm_year,
2031 | &tm.tm_mon,
2032 | &tm.tm_mday,
2033 | &num_chars) >= 3)
2034 | {
2035 | end = ptr + num_chars;
2036 | tm.tm_mon--;
2037 | if (tm.tm_year > 1900) tm.tm_year -= 1900;
2038 | } else {
2039 | goto fail;
2040 | }
2041 | }
2042 | else if (encoding & ENC_ISO_8601_TIME0x00020000) {
2043 | /* 2014-04-07 */
2044 | if (sscanf(ptr, "%d:%d:%d%n",
2045 | &tm.tm_hour,
2046 | &tm.tm_min,
2047 | &tm.tm_sec,
2048 | &num_chars) >= 2)
2049 | {
2050 | /* what should we do about day/month/year? */
2051 | /* setting it to "now" for now */
2052 | time_t time_now = time(NULL((void*)0));
2053 | struct tm *tm_now = gmtime(&time_now);
2054 | if (tm_now != NULL((void*)0)) {
2055 | tm.tm_year = tm_now->tm_year;
2056 | tm.tm_mon = tm_now->tm_mon;
2057 | tm.tm_mday = tm_now->tm_mday;
2058 | } else {
2059 | /* The second before the Epoch */
2060 | tm.tm_year = 69;
2061 | tm.tm_mon = 12;
2062 | tm.tm_mday = 31;
2063 | }
2064 | end = ptr + num_chars;
2065 | } else {
2066 | goto fail;
2067 | }
2068 | }
2069 | else if (encoding & ENC_IMF_DATE_TIME0x00040000) {
2070 | /*
2071 | * Match [dow,] day month year hh:mm[:ss] with
2072 | * two-digit years (RFC 822) or four-digit
2073 | * years (RFCs 1123, 2822, 5822). Skip
2074 | * the day of week since it is locale
2075 | * dependent and does not affect the resulting
2076 | * date anyway.
2077 | */
2078 | 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] == ',')
2079 | ptr += 4; /* Skip day of week. */
2080 |
2081 | /*
2082 | * Parse the day-of-month and month
2083 | * name.
2084 | */
2085 | char month_name[4] = { 0 };
2086 |
2087 | if (sscanf(ptr, "%d %3s%n",
2088 | &tm.tm_mday,
2089 | month_name,
2090 | &num_chars) < 2)
2091 | {
2092 | /* Not matched. */
2093 | goto fail;
2094 | }
2095 | if (!parse_month_name(month_name, &tm.tm_mon)) {
2096 | goto fail;
2097 | }
2098 | ptr += num_chars;
2099 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2100 | ptr++;
2101 |
2102 | /*
2103 | * Scan the year. Treat 2-digit years
2104 | * differently from 4-digit years.
2105 | */
2106 | uint32_t year;
2107 | const char *yearendp;
2108 |
2109 | if (!ws_strtou32(ptr, &yearendp, &year)) {
2110 | goto fail;
2111 | }
2112 | if (!IS_WSP(*yearendp)((*yearendp) == ' ' || (*yearendp) == '\t')) {
2113 | /* Not followed by WSP. */
2114 | goto fail;
2115 | }
2116 | if (yearendp - ptr < 2) {
2117 | /* 1-digit year. Error. */
2118 | goto fail;
2119 | }
2120 | if (yearendp - ptr == 2) {
2121 | /*
2122 | * 2-digit year.
2123 | *
2124 | * Match RFC 2822/RFC 5322 behavior;
2125 | * add 2000 to years from 0 to
2126 | * 49 and 1900 to uears from 50
2127 | * to 99.
2128 | */
2129 | if (year <= 49) {
2130 | year += 2000;
2131 | } else {
2132 | year += 1900;
2133 | }
2134 | } else if (yearendp - ptr == 3) {
2135 | /*
2136 | * 3-digit year.
2137 | *
2138 | * Match RFC 2822/RFC 5322 behavior;
2139 | * add 1900 to the year.
2140 | */
2141 | year += 1900;
2142 | }
2143 | tm.tm_year = year - 1900;
2144 | ptr = yearendp;
2145 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2146 | ptr++;
2147 |
2148 | /* Parse the time. */
2149 | if (sscanf(ptr, "%d:%d%n:%d%n",
2150 | &tm.tm_hour,
2151 | &tm.tm_min,
2152 | &num_chars,
2153 | &tm.tm_sec,
2154 | &num_chars) < 2)
2155 | {
2156 | goto fail;
2157 | }
2158 | ptr += num_chars;
2159 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2160 | ptr++;
2161 |
2162 | /*
2163 | * Parse the time zone.
2164 | * Check for obs-zone values first.
2165 | */
2166 | if (g_ascii_strncasecmp(ptr, "UT", 2) == 0)
2167 | {
2168 | ptr += 2;
2169 | }
2170 | else if (g_ascii_strncasecmp(ptr, "GMT", 3) == 0)
2171 | {
2172 | ptr += 3;
2173 | }
2174 | else
2175 | {
2176 | char sign;
2177 | int off_hr;
2178 | int off_min;
2179 |
2180 | if (sscanf(ptr, "%c%2d%2d%n",
2181 | &sign,
2182 | &off_hr,
2183 | &off_min,
2184 | &num_chars) < 3)
2185 | {
2186 | goto fail;
2187 | }
2188 |
2189 | /*
2190 | * If sign is '+', there's a positive
2191 | * UTC offset.
2192 | *
2193 | * If sign is '-', there's a negative
2194 | * UTC offset.
2195 | *
2196 | * Otherwise, that's an invalid UTC
2197 | * offset string.
2198 | */
2199 | if (sign == '+')
2200 | utc_offset += (off_hr * 3600) + (off_min * 60);
2201 | else if (sign == '-')
2202 | utc_offset -= (off_hr * 3600) + (off_min * 60);
2203 | else {
2204 | /* Sign must be + or - */
2205 | goto fail;
2206 | }
2207 | ptr += num_chars;
2208 | }
2209 | end = ptr;
2210 | }
2211 | ns->secs = mktime_utc(&tm);
2212 | if (ns->secs == (time_t)-1 && errno(*__errno_location ()) != 0) {
2213 | goto fail;
2214 | }
2215 | ns->secs += utc_offset;
2216 | }
2217 | } else {
2218 | /* Empty string */
2219 | goto fail;
2220 | }
2221 |
2222 | if (endoff)
2223 | *endoff = (unsigned)(offset + (end - begin));
2224 | wmem_free(NULL((void*)0), begin);
2225 | return ns;
2226 |
2227 | fail:
2228 | wmem_free(NULL((void*)0), begin);
2229 | return NULL((void*)0);
2230 | }
2231 |
2232 | /* Fetch an IPv4 address, in network byte order.
2233 | * We do *not* convert them to host byte order; we leave them in
2234 | * network byte order. */
2235 | uint32_t
2236 | tvb_get_ipv4(tvbuff_t *tvb, const unsigned offset)
2237 | {
2238 | const uint8_t *ptr;
2239 | uint32_t addr;
2240 |
2241 | ptr = fast_ensure_contiguous(tvb, offset, sizeof(uint32_t));
2242 | memcpy(&addr, ptr, sizeof addr);
2243 | return addr;
2244 | }
2245 |
2246 | /* Fetch an IPv6 address. */
2247 | void
2248 | tvb_get_ipv6(tvbuff_t *tvb, const unsigned offset, ws_in6_addr *addr)
2249 | {
2250 | const uint8_t *ptr;
2251 |
2252 | ptr = ensure_contiguous_unsigned(tvb, offset, sizeof(*addr));
2253 | memcpy(addr, ptr, sizeof *addr);
2254 | }
2255 |
2256 | /*
2257 | * These routines return the length of the address in bytes on success
2258 | * and -1 if the prefix length is too long.
2259 | */
2260 | int
2261 | tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, const unsigned offset, ws_in4_addr *addr,
2262 | uint32_t prefix_len)
2263 | {
2264 | uint8_t addr_len;
2265 |
2266 | if (prefix_len > 32)
2267 | return -1;
2268 |
2269 | addr_len = (prefix_len + 7) / 8;
2270 | *addr = 0;
2271 | tvb_memcpy(tvb, addr, offset, addr_len);
2272 | if (prefix_len % 8)
2273 | ((uint8_t*)addr)[addr_len - 1] &= ((0xff00 >> (prefix_len % 8)) & 0xff);
2274 | return addr_len;
2275 | }
2276 |
2277 | /*
2278 | * These routines return the length of the address in bytes on success
2279 | * and -1 if the prefix length is too long.
2280 | */
2281 | int
2282 | tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, const unsigned offset, ws_in6_addr *addr,
2283 | uint32_t prefix_len)
2284 | {
2285 | uint32_t addr_len;
2286 |
2287 | if (prefix_len > 128)
2288 | return -1;
2289 |
2290 | addr_len = (prefix_len + 7) / 8;
2291 | memset(addr->bytes, 0, 16);
2292 | tvb_memcpy(tvb, addr->bytes, offset, addr_len);
2293 | if (prefix_len % 8) {
2294 | addr->bytes[addr_len - 1] &=
2295 | ((0xff00 >> (prefix_len % 8)) & 0xff);
2296 | }
2297 |
2298 | return addr_len;
2299 | }
2300 |
2301 | /* Fetch a GUID. */
2302 | void
2303 | tvb_get_ntohguid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid)
2304 | {
2305 | const uint8_t *ptr = ensure_contiguous_unsigned(tvb, offset, GUID_LEN16);
2306 |
2307 | guid->data1 = pntohu32(ptr + 0);
2308 | guid->data2 = pntohu16(ptr + 4);
2309 | guid->data3 = pntohu16(ptr + 6);
2310 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2311 | }
2312 |
2313 | void
2314 | tvb_get_letohguid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid)
2315 | {
2316 | const uint8_t *ptr = ensure_contiguous_unsigned(tvb, offset, GUID_LEN16);
2317 |
2318 | guid->data1 = pletohu32(ptr + 0);
2319 | guid->data2 = pletohu16(ptr + 4);
2320 | guid->data3 = pletohu16(ptr + 6);
2321 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2322 | }
2323 |
2324 | void
2325 | tvb_get_guid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid, const unsigned encoding)
2326 | {
2327 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2328 | tvb_get_letohguid(tvb, offset, guid);
2329 | } else {
2330 | tvb_get_ntohguid(tvb, offset, guid);
2331 | }
2332 | }
2333 |
2334 | static const uint8_t bit_mask8[] = {
2335 | 0x00,
2336 | 0x01,
2337 | 0x03,
2338 | 0x07,
2339 | 0x0f,
2340 | 0x1f,
2341 | 0x3f,
2342 | 0x7f,
2343 | 0xff
2344 | };
2345 |
2346 |
2347 | /* Get a variable amount of bits
2348 | *
2349 | * Return a byte array with bit limited data.
2350 | * When encoding is ENC_BIG_ENDIAN, the data is aligned to the left.
2351 | * When encoding is ENC_LITTLE_ENDIAN, the data is aligned to the right.
2352 | */
2353 | uint8_t *
2354 | tvb_get_bits_array(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned bit_offset,
2355 | size_t no_of_bits, size_t *data_length, const unsigned encoding)
2356 | {
2357 | tvbuff_t *sub_tvb;
2358 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1 | Assuming the condition is true | →
2 | ← | Taking true branch | →
2359 | sub_tvb = tvb_new_octet_right_aligned(tvb, bit_offset, (int32_t) no_of_bits);
3 | ← | Calling 'tvb_new_octet_right_aligned' | →
2360 | } else {
2361 | sub_tvb = tvb_new_octet_aligned(tvb, bit_offset, (int32_t) no_of_bits);
2362 | }
2363 | *data_length = tvb_reported_length(sub_tvb);
2364 | return (uint8_t*)tvb_memdup(scope, sub_tvb, 0, *data_length);
2365 | }
2366 |
2367 | /* Get 1 - 8 bits */
2368 | uint8_t
2369 | tvb_get_bits8(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits)
2370 | {
2371 | 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", 2371 , "no_of_bits <= 8", "Too many bits requested for 8-bit return type" ))));
2372 | return (uint8_t)_tvb_get_bits64(tvb, bit_offset, no_of_bits);
2373 | }
2374 |
2375 | /* Get 1 - 16 bits */
2376 | uint16_t
2377 | tvb_get_bits16(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2378 | {
2379 | 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", 2379 , "no_of_bits <= 16", "Too many bits requested for 16-bit return type" ))));
2380 | return (uint16_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2381 | }
2382 |
2383 | /* Get 1 - 32 bits */
2384 | uint32_t
2385 | tvb_get_bits32(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2386 | {
2387 | 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", 2387 , "no_of_bits <= 32", "Too many bits requested for 32-bit return type" ))));
2388 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2389 | }
2390 |
2391 | /* Get 1 - 64 bits */
2392 | uint64_t
2393 | tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2394 | {
2395 | 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", 2395 , "no_of_bits <= 64", "Too many bits requested for 64-bit return type" ))));
2396 |
2397 | /* encoding determines bit numbering within octet array */
2398 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2399 | return _tvb_get_bits64_le(tvb, bit_offset, no_of_bits);
2400 | } else {
2401 | return _tvb_get_bits64(tvb, bit_offset, no_of_bits);
2402 | }
2403 | }
2404 |
2405 | /*
2406 | * This function will dissect a sequence of bits that does not need to be byte aligned; the bits
2407 | * set will be shown in the tree as ..10 10.. and the integer value returned if return_value is set.
2408 | * Offset should be given in bits from the start of the tvb.
2409 | * Bits within octet are numbered from MSB (0) to LSB (7). Bit at bit_offset is return value most significant bit.
2410 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2411 | */
2412 | static uint64_t
2413 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const unsigned total_no_of_bits)
2414 | {
2415 | uint64_t value;
2416 | unsigned octet_offset = bit_offset >> 3;
2417 | uint8_t required_bits_in_first_octet = 8 - (bit_offset % 8);
2418 |
2419 | if(required_bits_in_first_octet > total_no_of_bits)
2420 | {
2421 | /* the required bits don't extend to the end of the first octet */
2422 | uint8_t right_shift = required_bits_in_first_octet - total_no_of_bits;
2423 | value = (tvb_get_uint8(tvb, octet_offset) >> right_shift) & bit_mask8[total_no_of_bits % 8];
2424 | }
2425 | else
2426 | {
2427 | uint8_t remaining_bit_length = total_no_of_bits;
2428 |
2429 | /* get the bits up to the first octet boundary */
2430 | value = 0;
2431 | required_bits_in_first_octet %= 8;
2432 | if(required_bits_in_first_octet != 0)
2433 | {
2434 | value = tvb_get_uint8(tvb, octet_offset) & bit_mask8[required_bits_in_first_octet];
2435 | remaining_bit_length -= required_bits_in_first_octet;
2436 | octet_offset ++;
2437 | }
2438 | /* take the biggest words, shorts or octets that we can */
2439 | while (remaining_bit_length > 7)
2440 | {
2441 | switch (remaining_bit_length >> 4)
2442 | {
2443 | case 0:
2444 | /* 8 - 15 bits. (note that 0 - 7 would have dropped out of the while() loop) */
2445 | value <<= 8;
2446 | value += tvb_get_uint8(tvb, octet_offset);
2447 | remaining_bit_length -= 8;
2448 | octet_offset ++;
2449 | break;
2450 |
2451 | case 1:
2452 | /* 16 - 31 bits */
2453 | value <<= 16;
2454 | value += tvb_get_ntohs(tvb, octet_offset);
2455 | remaining_bit_length -= 16;
2456 | octet_offset += 2;
2457 | break;
2458 |
2459 | case 2:
2460 | case 3:
2461 | /* 32 - 63 bits */
2462 | value <<= 32;
2463 | value += tvb_get_ntohl(tvb, octet_offset);
2464 | remaining_bit_length -= 32;
2465 | octet_offset += 4;
2466 | break;
2467 |
2468 | default:
2469 | /* 64 bits (or more???) */
2470 | value = tvb_get_ntoh64(tvb, octet_offset);
2471 | remaining_bit_length -= 64;
2472 | octet_offset += 8;
2473 | break;
2474 | }
2475 | }
2476 | /* get bits from any partial octet at the tail */
2477 | if(remaining_bit_length)
2478 | {
2479 | value <<= remaining_bit_length;
2480 | value += (tvb_get_uint8(tvb, octet_offset) >> (8 - remaining_bit_length));
2481 | }
2482 | }
2483 | return value;
2484 | }
2485 |
2486 | /*
2487 | * Offset should be given in bits from the start of the tvb.
2488 | * Bits within octet are numbered from LSB (0) to MSB (7). Bit at bit_offset is return value least significant bit.
2489 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2490 | */
2491 | static uint64_t
2492 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const unsigned total_no_of_bits)
2493 | {
2494 | uint64_t value = 0;
2495 | unsigned octet_offset = bit_offset / 8;
2496 | unsigned remaining_bits = total_no_of_bits;
2497 | unsigned shift = 0;
2498 |
2499 | if (remaining_bits > 64)
2500 | {
2501 | remaining_bits = 64;
2502 | }
2503 |
2504 | if (bit_offset % 8)
2505 | {
2506 | /* not aligned, extract bits from first octet */
2507 | shift = 8 - (bit_offset % 8);
2508 | value = tvb_get_uint8(tvb, octet_offset) >> (bit_offset % 8);
2509 | if (shift > remaining_bits)
2510 | {
2511 | /* keep only the requested bits */
2512 | value &= (UINT64_C(1)1UL << remaining_bits) - 1;
2513 | remaining_bits = 0;
2514 | }
2515 | else
2516 | {
2517 | remaining_bits -= shift;
2518 | }
2519 | octet_offset++;
2520 | }
2521 |
2522 | while (remaining_bits > 0)
2523 | {
2524 | /* take the biggest words, shorts or octets that we can */
2525 | if (remaining_bits >= 32)
2526 | {
2527 | value |= ((uint64_t)tvb_get_letohl(tvb, octet_offset) << shift);
2528 | shift += 32;
2529 | remaining_bits -= 32;
2530 | octet_offset += 4;
2531 | }
2532 | else if (remaining_bits >= 16)
2533 | {
2534 | value |= ((uint64_t)tvb_get_letohs(tvb, octet_offset) << shift);
2535 | shift += 16;
2536 | remaining_bits -= 16;
2537 | octet_offset += 2;
2538 | }
2539 | else if (remaining_bits >= 8)
2540 | {
2541 | value |= ((uint64_t)tvb_get_uint8(tvb, octet_offset) << shift);
2542 | shift += 8;
2543 | remaining_bits -= 8;
2544 | octet_offset += 1;
2545 | }
2546 | else
2547 | {
2548 | unsigned mask = (1 << remaining_bits) - 1;
2549 | value |= (((uint64_t)tvb_get_uint8(tvb, octet_offset) & mask) << shift);
2550 | shift += remaining_bits;
2551 | remaining_bits = 0;
2552 | octet_offset += 1;
2553 | }
2554 | }
2555 | return value;
2556 | }
2557 |
2558 | /* Get 1 - 32 bits (should be deprecated as same as tvb_get_bits32??) */
2559 | uint32_t
2560 | tvb_get_bits(tvbuff_t *tvb, const unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2561 | {
2562 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2563 | }
2564 |
2565 | static bool_Bool
2566 | tvb_find_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, uint8_t needle, unsigned *end_offset)
2567 | {
2568 | const uint8_t *ptr;
2569 | const uint8_t *result;
2570 |
2571 | if (end_offset) {
2572 | *end_offset = abs_offset + limit;
2573 | }
2574 |
2575 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr() */
2576 | if (!ptr)
2577 | return false0;
2578 |
2579 | result = (const uint8_t *) memchr(ptr, needle, limit);
2580 | if (!result)
2581 | return false0;
2582 |
2583 | if (end_offset) {
2584 | *end_offset = (unsigned)((result - ptr) + abs_offset);
2585 | }
2586 | return true1;
2587 | }
2588 |
2589 | /* Find first occurrence of needle in tvbuff, starting at offset. Searches
2590 | * at most maxlength number of bytes; if maxlength is -1, searches to
2591 | * end of tvbuff.
2592 | * Returns the offset of the found needle, or -1 if not found.
2593 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2594 | * in that case, -1 will be returned if the boundary is reached before
2595 | * finding needle. */
2596 | int
2597 | tvb_find_uint8(tvbuff_t *tvb, const unsigned offset, const int maxlength, const uint8_t needle)
2598 | {
2599 | const uint8_t *result;
2600 | unsigned limit = 0, end_offset;
2601 | int exception;
2602 |
2603 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2603, "tvb && tvb->initialized" ))));
2604 |
2605 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2606 | if (exception)
2607 | THROW(exception)except_throw(1, (exception), ((void*)0));
2608 |
2609 | /* Only search to end of tvbuff, w/o throwing exception. */
2610 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2611 | /* Maximum length doesn't go past end of tvbuff; search
2612 | to that value. */
2613 | limit = (unsigned) maxlength;
2614 | }
2615 |
2616 | /* If we have real data, perform our search now. */
2617 | if (tvb->real_data) {
2618 | result = (const uint8_t *)memchr(tvb->real_data + offset, needle, limit);
2619 | if (result == NULL((void*)0)) {
2620 | return -1;
2621 | }
2622 | else {
2623 | return (int) (result - tvb->real_data);
2624 | }
2625 | }
2626 |
2627 | if (tvb->ops->tvb_find_uint8) {
2628 | if (!tvb->ops->tvb_find_uint8(tvb, offset, limit, needle, &end_offset)) {
2629 | return -1;
2630 | }
2631 | } else if (!tvb_find_uint8_generic(tvb, offset, limit, needle, &end_offset)) {
2632 | return -1;
2633 | }
2634 | return (int)end_offset;
2635 | }
2636 |
2637 | static bool_Bool
2638 | _tvb_find_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, const uint8_t needle, unsigned *end_offset)
2639 | {
2640 | const uint8_t *result;
2641 |
2642 | /* If we have real data, perform our search now. */
2643 | if (tvb->real_data) {
2644 | result = (const uint8_t *)memchr(tvb->real_data + offset, needle, limit);
2645 | if (result == NULL((void*)0)) {
2646 | if (end_offset) {
2647 | *end_offset = offset + limit;
2648 | }
2649 | return false0;
2650 | }
2651 | else {
2652 | if (end_offset) {
2653 | *end_offset = (unsigned)(result - tvb->real_data);
2654 | }
2655 | return true1;
2656 | }
2657 | }
2658 |
2659 | if (tvb->ops->tvb_find_uint8)
2660 | return tvb->ops->tvb_find_uint8(tvb, offset, limit, needle, end_offset);
2661 |
2662 | return tvb_find_uint8_generic(tvb, offset, limit, needle, end_offset);
2663 | }
2664 |
2665 | bool_Bool
2666 | tvb_find_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, const uint8_t needle, unsigned *end_offset)
2667 | {
2668 | unsigned limit = 0;
2669 | int exception;
2670 |
2671 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2671, "tvb && tvb->initialized" ))));
2672 |
2673 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2674 | if (exception)
2675 | THROW(exception)except_throw(1, (exception), ((void*)0));
2676 |
2677 | /* Only search to end of tvbuff, w/o throwing exception. */
2678 | if (limit > maxlength) {
2679 | /* Maximum length doesn't go past end of tvbuff; search
2680 | to that value. */
2681 | limit = maxlength;
2682 | }
2683 |
2684 | return _tvb_find_uint8_length(tvb, offset, limit, needle, end_offset);
2685 | }
2686 |
2687 | bool_Bool
2688 | tvb_find_uint8_remaining(tvbuff_t *tvb, const unsigned offset, const uint8_t needle, unsigned *end_offset)
2689 | {
2690 | unsigned limit = 0;
2691 | int exception;
2692 |
2693 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2693, "tvb && tvb->initialized" ))));
2694 |
2695 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2696 | if (exception)
2697 | THROW(exception)except_throw(1, (exception), ((void*)0));
2698 |
2699 | return _tvb_find_uint8_length(tvb, offset, limit, needle, end_offset);
2700 | }
2701 |
2702 | static bool_Bool
2703 | _tvb_find_uint16_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, const uint16_t needle, unsigned *end_offset)
2704 | {
2705 | const uint8_t needle1 = ((needle & 0xFF00) >> 8);
2706 | const uint8_t needle2 = ((needle & 0x00FF) >> 0);
2707 | unsigned searched_bytes = 0;
2708 | unsigned pos = offset;
2709 |
2710 | if (end_offset) {
2711 | *end_offset = offset + limit;
2712 | }
2713 |
2714 | do {
2715 | if (!_tvb_find_uint8_length(tvb, pos, limit - searched_bytes, needle1, &pos)) {
2716 | return false0;
2717 | }
2718 |
2719 | /* Bytes searched so far (not counting the second byte) */
2720 | searched_bytes = pos - offset + 1;
2721 |
2722 | /* Test vs. equality to account for the second byte */
2723 | if (searched_bytes >= limit) {
2724 | return false0;
2725 | }
2726 |
2727 | if (_tvb_find_uint8_length(tvb, pos + 1, 1, needle2, NULL((void*)0))) {
2728 | if (end_offset) {
2729 | *end_offset = pos;
2730 | }
2731 | return true1;
2732 | }
2733 |
2734 | pos += 1;
2735 | searched_bytes += 1;
2736 | } while (searched_bytes < limit);
2737 |
2738 | return false0;
2739 | }
2740 |
2741 | /* Same as tvb_find_uint8() with 16bit needle. */
2742 | int
2743 | tvb_find_uint16(tvbuff_t *tvb, const int offset, const int maxlength,
2744 | const uint16_t needle)
2745 | {
2746 | unsigned abs_offset = 0;
2747 | unsigned limit = 0;
2748 | unsigned end_offset;
2749 | int exception;
2750 |
2751 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit);
2752 | if (exception)
2753 | THROW(exception)except_throw(1, (exception), ((void*)0));
2754 |
2755 | /* Only search to end of tvbuff, w/o throwing exception. */
2756 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2757 | /* Maximum length doesn't go past end of tvbuff; search
2758 | to that value. */
2759 | limit = (unsigned) maxlength;
2760 | }
2761 |
2762 | if (!_tvb_find_uint16_length(tvb, abs_offset, limit, needle, &end_offset)) {
2763 | return -1;
2764 | }
2765 |
2766 | return end_offset;
2767 | }
2768 |
2769 | bool_Bool
2770 | tvb_find_uint16_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, const uint16_t needle, unsigned *end_offset)
2771 | {
2772 | unsigned limit = 0;
2773 | int exception;
2774 |
2775 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2775, "tvb && tvb->initialized" ))));
2776 |
2777 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2778 | if (exception)
2779 | THROW(exception)except_throw(1, (exception), ((void*)0));
2780 |
2781 | /* Only search to end of tvbuff, w/o throwing exception. */
2782 | if (limit > maxlength) {
2783 | /* Maximum length doesn't go past end of tvbuff; search
2784 | to that value. */
2785 | limit = maxlength;
2786 | }
2787 |
2788 | return _tvb_find_uint16_length(tvb, offset, limit, needle, end_offset);
2789 | }
2790 |
2791 | bool_Bool
2792 | tvb_find_uint16_remaining(tvbuff_t *tvb, const unsigned offset, const uint16_t needle, unsigned *end_offset)
2793 | {
2794 | unsigned limit = 0;
2795 | int exception;
2796 |
2797 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2797, "tvb && tvb->initialized" ))));
2798 |
2799 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2800 | if (exception)
2801 | THROW(exception)except_throw(1, (exception), ((void*)0));
2802 |
2803 | return _tvb_find_uint16_length(tvb, offset, limit, needle, end_offset);
2804 | }
2805 |
2806 | static inline bool_Bool
2807 | tvb_ws_mempbrk_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2808 | {
2809 | const uint8_t *ptr;
2810 | const uint8_t *result;
2811 |
2812 | if (found_offset) {
2813 | *found_offset = abs_offset + limit;
2814 | }
2815 |
2816 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr */
2817 | if (!ptr)
2818 | return false0;
2819 |
2820 | result = ws_mempbrk_exec(ptr, limit, pattern, found_needle);
2821 | if (!result)
2822 | return false0;
2823 |
2824 | if (found_offset) {
2825 | *found_offset = (unsigned)((result - ptr) + abs_offset);
2826 | }
2827 | return true1;
2828 | }
2829 |
2830 |
2831 | /* Find first occurrence of any of the pattern chars in tvbuff, starting at offset.
2832 | * Searches at most maxlength number of bytes; if maxlength is -1, searches
2833 | * to end of tvbuff.
2834 | * Returns the offset of the found needle, or -1 if not found.
2835 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2836 | * in that case, -1 will be returned if the boundary is reached before
2837 | * finding needle. */
2838 | int
2839 | tvb_ws_mempbrk_pattern_uint8(tvbuff_t *tvb, const unsigned offset, const int maxlength,
2840 | const ws_mempbrk_pattern* pattern, unsigned char *found_needle)
2841 | {
2842 | const uint8_t *result;
2843 | unsigned limit = 0, found_offset;
2844 | int exception;
2845 |
2846 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2846, "tvb && tvb->initialized" ))));
2847 |
2848 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2849 | if (exception)
2850 | THROW(exception)except_throw(1, (exception), ((void*)0));
2851 |
2852 | /* Only search to end of tvbuff, w/o throwing exception. */
2853 | if (limit > (unsigned) maxlength) {
2854 | /* Maximum length doesn't go past end of tvbuff; search
2855 | to that value. */
2856 | limit = maxlength;
2857 | }
2858 |
2859 | /* If we have real data, perform our search now. */
2860 | if (tvb->real_data) {
2861 | result = ws_mempbrk_exec(tvb->real_data + offset, limit, pattern, found_needle);
2862 | if (result == NULL((void*)0)) {
2863 | return -1;
2864 | }
2865 | else {
2866 | return (int) (result - tvb->real_data);
2867 | }
2868 | }
2869 |
2870 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8) {
2871 | if (!tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, offset, limit, pattern, &found_offset, found_needle)) {
2872 | return -1;
2873 | }
2874 | } else if (!tvb_ws_mempbrk_uint8_generic(tvb, offset, limit, pattern, &found_offset, found_needle)) {
2875 | return -1;
2876 | }
2877 | return (int)found_offset;
2878 | }
2879 |
2880 | static bool_Bool
2881 | _tvb_ws_mempbrk_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit,
2882 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2883 | {
2884 | const uint8_t *result;
2885 |
2886 | /* If we have real data, perform our search now. */
2887 | if (tvb->real_data) {
2888 | result = ws_mempbrk_exec(tvb->real_data + offset, limit, pattern, found_needle);
2889 | if (result == NULL((void*)0)) {
2890 | if (found_offset) {
2891 | *found_offset = offset + limit;
2892 | }
2893 | return false0;
2894 | }
2895 | else {
2896 | if (found_offset) {
2897 | *found_offset = (unsigned)(result - tvb->real_data);
2898 | }
2899 | return true1;
2900 | }
2901 | }
2902 |
2903 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8)
2904 | return tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, offset, limit, pattern, found_offset, found_needle);
2905 |
2906 | return tvb_ws_mempbrk_uint8_generic(tvb, offset, limit, pattern, found_offset, found_needle);
2907 | }
2908 |
2909 | bool_Bool
2910 | tvb_ws_mempbrk_uint8_remaining(tvbuff_t *tvb, const unsigned offset,
2911 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2912 | {
2913 | unsigned limit = 0;
2914 | int exception;
2915 |
2916 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2916, "tvb && tvb->initialized" ))));
2917 |
2918 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2919 | if (exception)
2920 | THROW(exception)except_throw(1, (exception), ((void*)0));
2921 |
2922 | return _tvb_ws_mempbrk_uint8_length(tvb, offset, limit, pattern, found_offset, found_needle);
2923 | }
2924 |
2925 | bool_Bool
2926 | tvb_ws_mempbrk_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength,
2927 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2928 | {
2929 | unsigned limit = 0;
2930 | int exception;
2931 |
2932 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2932, "tvb && tvb->initialized" ))));
2933 |
2934 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2935 | if (exception)
2936 | THROW(exception)except_throw(1, (exception), ((void*)0));
2937 |
2938 | /* Only search to end of tvbuff, w/o throwing exception. */
2939 | if (limit > maxlength) {
2940 | /* Maximum length doesn't go past end of tvbuff; search
2941 | to that value. */
2942 | limit = maxlength;
2943 | }
2944 |
2945 | return _tvb_ws_mempbrk_uint8_length(tvb, offset, limit, pattern, found_offset, found_needle);
2946 | }
2947 |
2948 | /* Find size of stringz (NUL-terminated string) by looking for terminating
2949 | * NUL. The size of the string includes the terminating NUL.
2950 | *
2951 | * If the NUL isn't found, it throws the appropriate exception.
2952 | */
2953 | unsigned
2954 | tvb_strsize(tvbuff_t *tvb, const unsigned offset)
2955 | {
2956 | unsigned nul_offset;
2957 |
2958 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2958, "tvb && tvb->initialized" ))));
2959 |
2960 | validate_offset(tvb, offset);
2961 | if (!tvb_find_uint8_remaining(tvb, offset, 0, &nul_offset)) {
2962 | /*
2963 | * OK, we hit the end of the tvbuff, so we should throw
2964 | * an exception.
2965 | */
2966 | if (tvb->length < tvb->contained_length) {
2967 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
2968 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
2969 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
2970 | } else if (tvb->length < tvb->reported_length) {
2971 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
2972 | } else {
2973 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2974 | }
2975 | }
2976 | return (nul_offset - offset) + 1;
2977 | }
2978 |
2979 | /* UTF-16/UCS-2 version of tvb_strsize */
2980 | /* Returns number of bytes including the (two-bytes) null terminator */
2981 | unsigned
2982 | tvb_unicode_strsize(tvbuff_t *tvb, const unsigned offset)
2983 | {
2984 | unsigned cur_offset = offset;
2985 | gunichar2 uchar;
2986 |
2987 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2987, "tvb && tvb->initialized" ))));
2988 |
2989 | /* Note: don't use tvb_find_uint16 because it must be aligned */
2990 | do {
2991 | /* Endianness doesn't matter when looking for null */
2992 | uchar = tvb_get_ntohs(tvb, cur_offset);
2993 | /* Make sure we don't overflow */
2994 | if (ckd_add(&cur_offset, cur_offset, 2)__builtin_add_overflow((cur_offset), (2), (&cur_offset))) {
2995 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2996 | }
2997 | } while(uchar != 0);
2998 |
2999 | return cur_offset - offset;
3000 | }
3001 |
3002 | /* UTF-32/UCS-4 version of tvb_strsize */
3003 | /* Returns number of bytes including the (four-bytes) null terminator */
3004 | static unsigned
3005 | tvb_ucs_4_strsize(tvbuff_t *tvb, const unsigned offset)
3006 | {
3007 |
3008 | unsigned end_offset;
3009 | gunichar uchar;
3010 |
3011 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3011, "tvb && tvb->initialized" ))));
3012 | end_offset = offset;
3013 | do {
3014 | /* Endianness doesn't matter when looking for null */
3015 | uchar = tvb_get_ntohl(tvb, end_offset);
3016 | /* Make sure we don't overflow */
3017 | if (ckd_add(&end_offset, end_offset, 4)__builtin_add_overflow((end_offset), (4), (&end_offset))) {
3018 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
3019 | }
3020 | } while(uchar != 0);
3021 | return end_offset - offset;
3022 | }
3023 |
3024 | unsigned
3025 | tvb_strsize_enc(tvbuff_t *tvb, const unsigned offset, const unsigned encoding)
3026 | {
3027 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3028 | case ENC_UTF_160x00000004:
3029 | case ENC_UCS_20x00000006:
3030 | return tvb_unicode_strsize(tvb, offset);
3031 |
3032 | case ENC_UCS_40x00000008:
3033 | return tvb_ucs_4_strsize(tvb, offset);
3034 |
3035 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3036 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3037 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3038 | 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" );
3039 | break;
3040 |
3041 | case ENC_ASCII_7BITS0x00000034:
3042 | REPORT_DISSECTOR_BUG("Null-terminated strings not implemented for ENC_ASCII_7BITS yet")proto_report_dissector_bug("Null-terminated strings not implemented for ENC_ASCII_7BITS yet" );
3043 | break;
3044 |
3045 | case ENC_APN_STR0x00000054:
3046 | /* At least as defined in 3GPP TS 23.003 Clause 9.1, null-termination
3047 | * does make sense as internal nulls are not allowed. */
3048 | REPORT_DISSECTOR_BUG("Null-terminated strings are not implemented for ENC_APN_STR")proto_report_dissector_bug("Null-terminated strings are not implemented for ENC_APN_STR" );
3049 | break;
3050 |
3051 | case ENC_BCD_DIGITS_0_90x00000044:
3052 | case ENC_KEYPAD_ABC_TBCD0x00000046:
3053 | case ENC_KEYPAD_BC_TBCD0x00000048:
3054 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
3055 | REPORT_DISSECTOR_BUG("Null-terminated strings are not supported for BCD encodings.")proto_report_dissector_bug("Null-terminated strings are not supported for BCD encodings." );
3056 | break;
3057 |
3058 | case ENC_ASCII0x00000000:
3059 | case ENC_UTF_80x00000002:
3060 | case ENC_ISO_8859_10x0000000A:
3061 | case ENC_ISO_8859_20x0000000C:
3062 | case ENC_ISO_8859_30x0000000E:
3063 | case ENC_ISO_8859_40x00000010:
3064 | case ENC_ISO_8859_50x00000012:
3065 | case ENC_ISO_8859_60x00000014:
3066 | case ENC_ISO_8859_70x00000016:
3067 | case ENC_ISO_8859_80x00000018:
3068 | case ENC_ISO_8859_90x0000001A:
3069 | case ENC_ISO_8859_100x0000001C:
3070 | case ENC_ISO_8859_110x0000001E:
3071 | case ENC_ISO_8859_130x00000022:
3072 | case ENC_ISO_8859_140x00000024:
3073 | case ENC_ISO_8859_150x00000026:
3074 | case ENC_ISO_8859_160x00000028:
3075 | case ENC_WINDOWS_12500x0000002A:
3076 | case ENC_WINDOWS_12510x0000003C:
3077 | case ENC_WINDOWS_12520x0000003A:
3078 | case ENC_MAC_ROMAN0x00000030:
3079 | case ENC_CP4370x00000032:
3080 | case ENC_CP8550x0000003E:
3081 | case ENC_CP8660x00000040:
3082 | case ENC_ISO_646_BASIC0x00000042:
3083 | case ENC_EBCDIC0x0000002E:
3084 | case ENC_EBCDIC_CP0370x00000038:
3085 | case ENC_EBCDIC_CP5000x00000060:
3086 | case ENC_T610x00000036:
3087 | case ENC_GB180300x00000050:
3088 | case ENC_EUC_KR0x00000052:
3089 | case ENC_DECT_STANDARD_8BITS0x00000056:
3090 | default:
3091 | return tvb_strsize(tvb, offset);
3092 | }
3093 | }
3094 |
3095 | /* Find length of string by looking for end of string ('\0'), up to
3096 | * 'maxlength' characters'; if 'maxlength' is -1, searches to end
3097 | * of tvbuff.
3098 | * Returns -1 if 'maxlength' reached before finding EOS. */
3099 | int
3100 | tvb_strnlen(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength)
3101 | {
3102 | unsigned result_offset;
3103 |
3104 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3104, "tvb && tvb->initialized" ))));
3105 |
3106 | /* TODO - this needs a variant that returns a bool
3107 | * and sets a unsigned offset to the value if true. */
3108 | if (!tvb_find_uint8_length(tvb, offset, maxlength, 0, &result_offset)) {
3109 | return -1;
3110 | }
3111 | else {
3112 | return (int)(result_offset - offset);
3113 | }
3114 | }
3115 |
3116 | /*
3117 | * Implement strneql etc
3118 | */
3119 |
3120 | /*
3121 | * Call strncmp after checking if enough chars left, returning 0 if
3122 | * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
3123 | */
3124 | int
3125 | tvb_strneql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
3126 | {
3127 | const uint8_t *ptr;
3128 |
3129 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3130 |
3131 | if (ptr) {
3132 | int cmp = strncmp((const char *)ptr, str, size);
3133 |
3134 | /*
3135 | * Return 0 if equal, -1 otherwise.
3136 | */
3137 | return (cmp == 0 ? 0 : -1);
3138 | } else {
3139 | /*
3140 | * Not enough characters in the tvbuff to match the
3141 | * string.
3142 | */
3143 | return -1;
3144 | }
3145 | }
3146 |
3147 | /*
3148 | * Call g_ascii_strncasecmp after checking if enough chars left, returning
3149 | * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
3150 | */
3151 | int
3152 | tvb_strncaseeql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
3153 | {
3154 | const uint8_t *ptr;
3155 |
3156 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3157 |
3158 | if (ptr) {
3159 | int cmp = g_ascii_strncasecmp((const char *)ptr, str, size);
3160 |
3161 | /*
3162 | * Return 0 if equal, -1 otherwise.
3163 | */
3164 | return (cmp == 0 ? 0 : -1);
3165 | } else {
3166 | /*
3167 | * Not enough characters in the tvbuff to match the
3168 | * string.
3169 | */
3170 | return -1;
3171 | }
3172 | }
3173 |
3174 | /*
3175 | * Check that the tvbuff contains at least size bytes, starting at
3176 | * offset, and that those bytes are equal to str. Return 0 for success
3177 | * and -1 for error. This function does not throw an exception.
3178 | */
3179 | int
3180 | tvb_memeql(tvbuff_t *tvb, const unsigned offset, const uint8_t *str, size_t size)
3181 | {
3182 | const uint8_t *ptr;
3183 |
3184 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3185 |
3186 | if (ptr) {
3187 | int cmp = memcmp(ptr, str, size);
3188 |
3189 | /*
3190 | * Return 0 if equal, -1 otherwise.
3191 | */
3192 | return (cmp == 0 ? 0 : -1);
3193 | } else {
3194 | /*
3195 | * Not enough characters in the tvbuff to match the
3196 | * string.
3197 | */
3198 | return -1;
3199 | }
3200 | }
3201 |
3202 | /**
3203 | * Format the data in the tvb from offset for size.
3204 | */
3205 | char *
3206 | tvb_format_text(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3207 | {
3208 | const uint8_t *ptr;
3209 |
3210 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3211 | return format_text(scope, (const char*)ptr, size);
3212 | }
3213 |
3214 | /*
3215 | * Format the data in the tvb from offset for length ...
3216 | */
3217 | char *
3218 | tvb_format_text_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3219 | {
3220 | const uint8_t *ptr;
3221 |
3222 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3223 | return format_text_wsp(allocator, (const char*)ptr, size);
3224 | }
3225 |
3226 | /**
3227 | * Like "tvb_format_text()", but for null-padded strings; don't show
3228 | * the null padding characters as "\000".
3229 | */
3230 | char *
3231 | tvb_format_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3232 | {
3233 | const uint8_t *ptr, *p;
3234 | unsigned stringlen;
3235 |
3236 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3237 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
3238 | ;
3239 | return format_text(scope, (const char*)ptr, stringlen);
3240 | }
3241 |
3242 | /*
3243 | * Like "tvb_format_text_wsp()", but for null-padded strings; don't show
3244 | * the null padding characters as "\000".
3245 | */
3246 | char *
3247 | tvb_format_stringzpad_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3248 | {
3249 | const uint8_t *ptr, *p;
3250 | unsigned stringlen;
3251 |
3252 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3253 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
3254 | ;
3255 | return format_text_wsp(allocator, (const char*)ptr, stringlen);
3256 | }
3257 |
3258 | /*
3259 | * All string functions below take a scope as an argument.
3260 | *
3261 | *
3262 | * If scope is NULL, memory is allocated with g_malloc() and user must
3263 | * explicitly free it with g_free().
3264 | * If scope is not NULL, memory is allocated with the corresponding pool
3265 | * lifetime.
3266 | *
3267 | * All functions throw an exception if the tvbuff ends before the string
3268 | * does.
3269 | */
3270 |
3271 | /*
3272 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3273 | * of bytes referred to by the tvbuff, offset, and length as an ASCII string,
3274 | * with all bytes with the high-order bit set being invalid, and return a
3275 | * pointer to a UTF-8 string, allocated using the wmem scope.
3276 | *
3277 | * Octets with the highest bit set will be converted to the Unicode
3278 | * REPLACEMENT CHARACTER.
3279 | */
3280 | static uint8_t *
3281 | tvb_get_ascii_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3282 | {
3283 | const uint8_t *ptr;
3284 |
3285 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3286 | return get_ascii_string(scope, ptr, length);
3287 | }
3288 |
3289 | /*
3290 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation table,
3291 | * treat the string of bytes referred to by the tvbuff, offset, and length
3292 | * as a string encoded using one octet per character, with octets with the
3293 | * high-order bit clear being mapped by the translation table to 2-byte
3294 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
3295 | * CHARACTER) and octets with the high-order bit set being mapped to
3296 | * REPLACEMENT CHARACTER, and return a pointer to a UTF-8 string,
3297 | * allocated using the wmem scope.
3298 | *
3299 | * Octets with the highest bit set will be converted to the Unicode
3300 | * REPLACEMENT CHARACTER.
3301 | */
3302 | static uint8_t *
3303 | tvb_get_iso_646_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
3304 | {
3305 | const uint8_t *ptr;
3306 |
3307 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3308 | return get_iso_646_string(scope, ptr, length, table);
3309 | }
3310 |
3311 | /*
3312 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3313 | * of bytes referred to by the tvbuff, the offset. and the length as a UTF-8
3314 | * string, and return a pointer to a UTF-8 string, allocated using the wmem
3315 | * scope, with all ill-formed sequences replaced with the Unicode REPLACEMENT
3316 | * CHARACTER according to the recommended "best practices" given in the Unicode
3317 | * Standard and specified by W3C/WHATWG.
3318 | *
3319 | * Note that in conformance with the Unicode Standard, this treats three
3320 | * byte sequences corresponding to UTF-16 surrogate halves (paired or unpaired)
3321 | * and two byte overlong encodings of 7-bit ASCII characters as invalid and
3322 | * substitutes REPLACEMENT CHARACTER for them. Explicit support for nonstandard
3323 | * derivative encoding formats (e.g. CESU-8, Java Modified UTF-8, WTF-8) could
3324 | * be added later.
3325 | */
3326 | static uint8_t *
3327 | tvb_get_utf_8_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length)
3328 | {
3329 | const uint8_t *ptr;
3330 |
3331 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3332 | return get_utf_8_string(scope, ptr, length);
3333 | }
3334 |
3335 | /*
3336 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3337 | * of bytes referred to by the tvbuff, the offset, and the length as a
3338 | * raw string, and return a pointer to that string, allocated using the
3339 | * wmem scope. This means a null is appended at the end, but no replacement
3340 | * checking is done otherwise, unlike tvb_get_utf_8_string().
3341 | */
3342 | static inline uint8_t *
3343 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length)
3344 | {
3345 | uint8_t *strbuf;
3346 |
3347 | tvb_ensure_bytes_exist(tvb, offset, length);
3348 | strbuf = (uint8_t *)wmem_alloc(scope, length + 1);
3349 | tvb_memcpy(tvb, strbuf, offset, length);
3350 | strbuf[length] = '\0';
3351 | return strbuf;
3352 | }
3353 |
3354 | /*
3355 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3356 | * of bytes referred to by the tvbuff, the offset, and the length as an
3357 | * ISO 8859/1 string, and return a pointer to a UTF-8 string, allocated
3358 | * using the wmem scope.
3359 | */
3360 | static uint8_t *
3361 | tvb_get_string_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3362 | {
3363 | const uint8_t *ptr;
3364 |
3365 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3366 | return get_8859_1_string(scope, ptr, length);
3367 | }
3368 |
3369 | /*
3370 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3371 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3372 | * and the length as a string encoded using one octet per character, with
3373 | * octets with the high-order bit clear being ASCII and octets with the
3374 | * high-order bit set being mapped by the translation table to 2-byte
3375 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
3376 | * CHARACTER), and return a pointer to a UTF-8 string, allocated with the
3377 | * wmem scope.
3378 | */
3379 | static uint8_t *
3380 | tvb_get_string_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
3381 | {
3382 | const uint8_t *ptr;
3383 |
3384 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3385 | return get_unichar2_string(scope, ptr, length, table);
3386 | }
3387 |
3388 | /*
3389 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3390 | * giving the byte order, treat the string of bytes referred to by the
3391 | * tvbuff, the offset, and the length as a UCS-2 encoded string in
3392 | * the byte order in question, containing characters from the Basic
3393 | * Multilingual Plane (plane 0) of Unicode, and return a pointer to a
3394 | * UTF-8 string, allocated with the wmem scope.
3395 | *
3396 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3397 | * optionally with ENC_BOM.
3398 | *
3399 | * Specify length in bytes.
3400 | *
3401 | * XXX - should map lead and trail surrogate values to REPLACEMENT
3402 | * CHARACTERs (0xFFFD)?
3403 | * XXX - if there are an odd number of bytes, should put a
3404 | * REPLACEMENT CHARACTER at the end.
3405 | */
3406 | static uint8_t *
3407 | tvb_get_ucs_2_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3408 | {
3409 | const uint8_t *ptr;
3410 |
3411 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3412 | return get_ucs_2_string(scope, ptr, length, encoding);
3413 | }
3414 |
3415 | /*
3416 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3417 | * giving the byte order, treat the string of bytes referred to by the
3418 | * tvbuff, the offset, and the length as a UTF-16 encoded string in
3419 | * the byte order in question, and return a pointer to a UTF-8 string,
3420 | * allocated with the wmem scope.
3421 | *
3422 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3423 | * optionally with ENC_BOM.
3424 | *
3425 | * Specify length in bytes.
3426 | *
3427 | * XXX - should map surrogate errors to REPLACEMENT CHARACTERs (0xFFFD).
3428 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3429 | * XXX - if there are an odd number of bytes, should put a
3430 | * REPLACEMENT CHARACTER at the end.
3431 | */
3432 | static uint8_t *
3433 | tvb_get_utf_16_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3434 | {
3435 | const uint8_t *ptr;
3436 |
3437 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3438 | return get_utf_16_string(scope, ptr, length, encoding);
3439 | }
3440 |
3441 | /*
3442 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3443 | * giving the byte order, treat the string of bytes referred to by the
3444 | * tvbuff, the offset, and the length as a UCS-4 encoded string in
3445 | * the byte order in question, and return a pointer to a UTF-8 string,
3446 | * allocated with the wmem scope.
3447 | *
3448 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3449 | * optionally with ENC_BOM.
3450 | *
3451 | * Specify length in bytes
3452 | *
3453 | * XXX - should map lead and trail surrogate values to a "substitute"
3454 | * UTF-8 character?
3455 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3456 | * XXX - if the number of bytes isn't a multiple of 4, should put a
3457 | * REPLACEMENT CHARACTER at the end.
3458 | */
3459 | static char *
3460 | tvb_get_ucs_4_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3461 | {
3462 | const uint8_t *ptr;
3463 |
3464 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3465 | return (char*)get_ucs_4_string(scope, ptr, length, encoding);
3466 | }
3467 |
3468 | char *
3469 | tvb_get_ts_23_038_7bits_string_packed(wmem_allocator_t *scope, tvbuff_t *tvb,
3470 | const unsigned bit_offset, unsigned no_of_chars)
3471 | {
3472 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3473 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3474 | const uint8_t *ptr;
3475 |
3476 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3476, "tvb && tvb->initialized" ))));
3477 |
3478 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3479 | return (char*)get_ts_23_038_7bits_string_packed(scope, ptr, bit_offset, no_of_chars);
3480 | }
3481 |
3482 | char *
3483 | tvb_get_ts_23_038_7bits_string_unpacked(wmem_allocator_t *scope, tvbuff_t *tvb,
3484 | const unsigned offset, unsigned length)
3485 | {
3486 | const uint8_t *ptr;
3487 |
3488 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3488, "tvb && tvb->initialized" ))));
3489 |
3490 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3491 | return (char*)get_ts_23_038_7bits_string_unpacked(scope, ptr, length);
3492 | }
3493 |
3494 | char *
3495 | tvb_get_etsi_ts_102_221_annex_a_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3496 | const unsigned offset, unsigned length)
3497 | {
3498 | const uint8_t *ptr;
3499 |
3500 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3500, "tvb && tvb->initialized" ))));
3501 |
3502 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3503 | return (char*)get_etsi_ts_102_221_annex_a_string(scope, ptr, length);
3504 | }
3505 |
3506 | char *
3507 | tvb_get_ascii_7bits_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3508 | const unsigned bit_offset, unsigned no_of_chars)
3509 | {
3510 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3511 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3512 | const uint8_t *ptr;
3513 |
3514 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3514, "tvb && tvb->initialized" ))));
3515 |
3516 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3517 | return (char*)get_ascii_7bits_string(scope, ptr, bit_offset, no_of_chars);
3518 | }
3519 |
3520 | /*
3521 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3522 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3523 | * and the length as a string encoded using one octet per character, with
3524 | * octets being mapped by the translation table to 2-byte Unicode Basic
3525 | * Multilingual Plane characters (including REPLACEMENT CHARACTER), and
3526 | * return a pointer to a UTF-8 string, allocated with the wmem scope.
3527 | */
3528 | static uint8_t *
3529 | tvb_get_nonascii_unichar2_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[256])
3530 | {
3531 | const uint8_t *ptr;
3532 |
3533 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3534 | return get_nonascii_unichar2_string(scope, ptr, length, table);
3535 | }
3536 |
3537 | /*
3538 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3539 | * referred to by the tvbuff, offset, and length as a GB18030 encoded string,
3540 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3541 | * converted having substituted REPLACEMENT CHARACTER according to the
3542 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3543 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3544 | *
3545 | * As expected, this will also decode GBK and GB2312 strings.
3546 | */
3547 | static uint8_t *
3548 | tvb_get_gb18030_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3549 | {
3550 | const uint8_t *ptr;
3551 |
3552 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3553 | return get_gb18030_string(scope, ptr, length);
3554 | }
3555 |
3556 | /*
3557 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3558 | * referred to by the tvbuff, offset, and length as a EUC-KR encoded string,
3559 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3560 | * converted having substituted REPLACEMENT CHARACTER according to the
3561 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3562 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3563 | */
3564 | static uint8_t *
3565 | tvb_get_euc_kr_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3566 | {
3567 | const uint8_t *ptr;
3568 |
3569 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3570 | return get_euc_kr_string(scope, ptr, length);
3571 | }
3572 |
3573 | static uint8_t *
3574 | tvb_get_t61_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3575 | {
3576 | const uint8_t *ptr;
3577 |
3578 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3579 | return get_t61_string(scope, ptr, length);
3580 | }
3581 |
3582 | /*
3583 | * Encoding tables for BCD strings.
3584 | */
3585 | static const dgt_set_t Dgt0_9_bcd = {
3586 | {
3587 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3588 | '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?','?'
3589 | }
3590 | };
3591 |
3592 | static const dgt_set_t Dgt_keypad_abc_tbcd = {
3593 | {
3594 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3595 | '0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?'
3596 | }
3597 | };
3598 |
3599 | static const dgt_set_t Dgt_ansi_tbcd = {
3600 | {
3601 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3602 | '0','1','2','3','4','5','6','7','8','9','?','B','C','*','#','?'
3603 | }
3604 | };
3605 |
3606 | static const dgt_set_t Dgt_dect_standard_4bits_tbcd = {
3607 | {
3608 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3609 | '0','1','2','3','4','5','6','7','8','9','?',' ','?','?','?','?'
3610 | }
3611 | };
3612 |
3613 | static uint8_t *
3614 | tvb_get_apn_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3615 | unsigned length)
3616 | {
3617 | wmem_strbuf_t *str;
3618 |
3619 | /*
3620 | * This is a domain name.
3621 | *
3622 | * 3GPP TS 23.003, section 19.4.2 "Fully Qualified Domain Names
3623 | * (FQDNs)", subsection 19.4.2.1 "General", says:
3624 | *
3625 | * The encoding of any identifier used as part of a Fully
3626 | * Qualified Domain Name (FQDN) shall follow the Name Syntax
3627 | * defined in IETF RFC 2181 [18], IETF RFC 1035 [19] and
3628 | * IETF RFC 1123 [20]. An FQDN consists of one or more
3629 | * labels. Each label is coded as a one octet length field
3630 | * followed by that number of octets coded as 8 bit ASCII
3631 | * characters.
3632 | *
3633 | * so this does not appear to use full-blown DNS compression -
3634 | * the upper 2 bits of the length don't indicate that it's a
3635 | * pointer or an extended label (RFC 2673).
3636 | */
3637 | str = wmem_strbuf_new_sized(scope, length + 1);
3638 | if (length > 0) {
3639 | const uint8_t *ptr;
3640 |
3641 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3642 |
3643 | for (;;) {
3644 | unsigned label_len;
3645 |
3646 | /*
3647 | * Process this label.
3648 | */
3649 | label_len = *ptr;
3650 | ptr++;
3651 | length--;
3652 |
3653 | while (label_len != 0) {
3654 | uint8_t ch;
3655 |
3656 | if (length == 0)
3657 | goto end;
3658 |
3659 | ch = *ptr;
3660 | if (ch < 0x80)
3661 | wmem_strbuf_append_c(str, ch);
3662 | else
3663 | wmem_strbuf_append_unichar_repl(str)wmem_strbuf_append_unichar(str, 0x00FFFD);
3664 | ptr++;
3665 | label_len--;
3666 | length--;
3667 | }
3668 |
3669 | if (length == 0)
3670 | goto end;
3671 |
3672 | wmem_strbuf_append_c(str, '.');
3673 | }
3674 | }
3675 |
3676 | end:
3677 | return (uint8_t *) wmem_strbuf_finalize(str);
3678 | }
3679 |
3680 | static uint8_t *
3681 | tvb_get_dect_standard_8bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3682 | {
3683 | const uint8_t *ptr;
3684 |
3685 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3686 | return get_dect_standard_8bits_string(scope, ptr, length);
3687 | }
3688 |
3689 | /*
3690 | * Given a tvbuff, an offset, a length, and an encoding, allocate a
3691 | * buffer big enough to hold a non-null-terminated string of that length
3692 | * at that offset, plus a trailing '\0', copy into the buffer the
3693 | * string as converted from the appropriate encoding to UTF-8, and
3694 | * return a pointer to the string.
3695 | */
3696 | uint8_t *
3697 | tvb_get_string_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3698 | const unsigned length, const unsigned encoding)
3699 | {
3700 | uint8_t *strptr;
3701 | bool_Bool odd, skip_first;
3702 |
3703 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3703, "tvb && tvb->initialized" ))));
3704 |
3705 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3706 |
3707 | case ENC_ASCII0x00000000:
3708 | default:
3709 | /*
3710 | * For now, we treat bogus values as meaning
3711 | * "ASCII" rather than reporting an error,
3712 | * for the benefit of old dissectors written
3713 | * when the last argument to proto_tree_add_item()
3714 | * was a bool for the byte order, not an
3715 | * encoding value, and passed non-zero values
3716 | * other than true to mean "little-endian".
3717 | */
3718 | strptr = tvb_get_ascii_string(scope, tvb, offset, length);
3719 | break;
3720 |
3721 | case ENC_UTF_80x00000002:
3722 | strptr = tvb_get_utf_8_string(scope, tvb, offset, length);
3723 | break;
3724 |
3725 | case ENC_UTF_160x00000004:
3726 | strptr = tvb_get_utf_16_string(scope, tvb, offset, length,
3727 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3728 | break;
3729 |
3730 | case ENC_UCS_20x00000006:
3731 | strptr = tvb_get_ucs_2_string(scope, tvb, offset, length,
3732 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3733 | break;
3734 |
3735 | case ENC_UCS_40x00000008:
3736 | strptr = (uint8_t*)tvb_get_ucs_4_string(scope, tvb, offset, length,
3737 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3738 | break;
3739 |
3740 | case ENC_ISO_8859_10x0000000A:
3741 | /*
3742 | * ISO 8859-1 printable code point values are equal
3743 | * to the equivalent Unicode code point value, so
3744 | * no translation table is needed.
3745 | */
3746 | strptr = tvb_get_string_8859_1(scope, tvb, offset, length);
3747 | break;
3748 |
3749 | case ENC_ISO_8859_20x0000000C:
3750 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_2);
3751 | break;
3752 |
3753 | case ENC_ISO_8859_30x0000000E:
3754 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_3);
3755 | break;
3756 |
3757 | case ENC_ISO_8859_40x00000010:
3758 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_4);
3759 | break;
3760 |
3761 | case ENC_ISO_8859_50x00000012:
3762 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_5);
3763 | break;
3764 |
3765 | case ENC_ISO_8859_60x00000014:
3766 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_6);
3767 | break;
3768 |
3769 | case ENC_ISO_8859_70x00000016:
3770 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_7);
3771 | break;
3772 |
3773 | case ENC_ISO_8859_80x00000018:
3774 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_8);
3775 | break;
3776 |
3777 | case ENC_ISO_8859_90x0000001A:
3778 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_9);
3779 | break;
3780 |
3781 | case ENC_ISO_8859_100x0000001C:
3782 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_10);
3783 | break;
3784 |
3785 | case ENC_ISO_8859_110x0000001E:
3786 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_11);
3787 | break;
3788 |
3789 | case ENC_ISO_8859_130x00000022:
3790 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_13);
3791 | break;
3792 |
3793 | case ENC_ISO_8859_140x00000024:
3794 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_14);
3795 | break;
3796 |
3797 | case ENC_ISO_8859_150x00000026:
3798 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_15);
3799 | break;
3800 |
3801 | case ENC_ISO_8859_160x00000028:
3802 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_16);
3803 | break;
3804 |
3805 | case ENC_WINDOWS_12500x0000002A:
3806 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1250);
3807 | break;
3808 |
3809 | case ENC_WINDOWS_12510x0000003C:
3810 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1251);
3811 | break;
3812 |
3813 | case ENC_WINDOWS_12520x0000003A:
3814 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1252);
3815 | break;
3816 |
3817 | case ENC_MAC_ROMAN0x00000030:
3818 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_mac_roman);
3819 | break;
3820 |
3821 | case ENC_CP4370x00000032:
3822 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp437);
3823 | break;
3824 |
3825 | case ENC_CP8550x0000003E:
3826 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp855);
3827 | break;
3828 |
3829 | case ENC_CP8660x00000040:
3830 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp866);
3831 | break;
3832 |
3833 | case ENC_ISO_646_BASIC0x00000042:
3834 | strptr = tvb_get_iso_646_string(scope, tvb, offset, length, charset_table_iso_646_basic);
3835 | break;
3836 |
3837 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3838 | {
3839 | unsigned bit_offset = offset << 3;
3840 | unsigned no_of_chars = (length << 3) / 7;
3841 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_packed(scope, tvb, bit_offset, no_of_chars);
3842 | }
3843 | break;
3844 |
3845 | case ENC_ASCII_7BITS0x00000034:
3846 | {
3847 | unsigned bit_offset = offset << 3;
3848 | unsigned no_of_chars = (length << 3) / 7;
3849 | strptr = (uint8_t*)tvb_get_ascii_7bits_string(scope, tvb, bit_offset, no_of_chars);
3850 | }
3851 | break;
3852 |
3853 | case ENC_EBCDIC0x0000002E:
3854 | /*
3855 | * "Common" EBCDIC, covering all characters with the
3856 | * same code point in all Roman-alphabet EBCDIC code
3857 | * pages.
3858 | */
3859 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic);
3860 | break;
3861 |
3862 | case ENC_EBCDIC_CP0370x00000038:
3863 | /*
3864 | * EBCDIC code page 037.
3865 | */
3866 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp037);
3867 | break;
3868 |
3869 | case ENC_EBCDIC_CP5000x00000060:
3870 | /*
3871 | * EBCDIC code page 500.
3872 | */
3873 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp500);
3874 | break;
3875 |
3876 | case ENC_T610x00000036:
3877 | strptr = tvb_get_t61_string(scope, tvb, offset, length);
3878 | break;
3879 |
3880 | case ENC_BCD_DIGITS_0_90x00000044:
3881 | /*
3882 | * Packed BCD, with digits 0-9.
3883 | */
3884 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3885 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3886 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt0_9_bcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3887 | break;
3888 |
3889 | case ENC_KEYPAD_ABC_TBCD0x00000046:
3890 | /*
3891 | * Keypad-with-a/b/c "telephony BCD" - packed BCD, with
3892 | * digits 0-9 and symbols *, #, a, b, and c.
3893 | */
3894 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3895 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3896 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_keypad_abc_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3897 | break;
3898 |
3899 | case ENC_KEYPAD_BC_TBCD0x00000048:
3900 | /*
3901 | * Keypad-with-B/C "telephony BCD" - packed BCD, with
3902 | * digits 0-9 and symbols B, C, *, and #.
3903 | */
3904 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3905 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3906 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_ansi_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3907 | break;
3908 |
3909 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3910 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_unpacked(scope, tvb, offset, length);
3911 | break;
3912 |
3913 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3914 | strptr = (uint8_t*)tvb_get_etsi_ts_102_221_annex_a_string(scope, tvb, offset, length);
3915 | break;
3916 |
3917 | case ENC_GB180300x00000050:
3918 | strptr = tvb_get_gb18030_string(scope, tvb, offset, length);
3919 | break;
3920 |
3921 | case ENC_EUC_KR0x00000052:
3922 | strptr = tvb_get_euc_kr_string(scope, tvb, offset, length);
3923 | break;
3924 |
3925 | case ENC_APN_STR0x00000054:
3926 | strptr = tvb_get_apn_string(scope, tvb, offset, length);
3927 | break;
3928 |
3929 | case ENC_DECT_STANDARD_8BITS0x00000056:
3930 | strptr = tvb_get_dect_standard_8bits_string(scope, tvb, offset, length);
3931 | break;
3932 |
3933 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
3934 | /*
3935 | * DECT standard 4bits "telephony BCD" - packed BCD, with
3936 | * digits 0-9 and symbol SPACE for 0xb.
3937 | */
3938 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3939 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3940 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_dect_standard_4bits_tbcd, skip_first, odd, false0);
3941 | break;
3942 | }
3943 | return strptr;
3944 | }
3945 |
3946 | /*
3947 | * This is like tvb_get_string_enc(), except that it handles null-padded
3948 | * strings.
3949 | *
3950 | * Currently, string values are stored as UTF-8 null-terminated strings,
3951 | * so nothing needs to be done differently for null-padded strings; we
3952 | * could save a little memory by not storing the null padding.
3953 | *
3954 | * If we ever store string values differently, in a fashion that doesn't
3955 | * involve null termination, that might change.
3956 | */
3957 | uint8_t *
3958 | tvb_get_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3959 | const unsigned length, const unsigned encoding)
3960 | {
3961 | return tvb_get_string_enc(scope, tvb, offset, length, encoding);
3962 | }
3963 |
3964 | /*
3965 | * These routines are like the above routines, except that they handle
3966 | * null-terminated strings. They find the length of that string (and
3967 | * throw an exception if the tvbuff ends before we find the null), and
3968 | * also return through a pointer the length of the string, in bytes,
3969 | * including the terminating null (the terminating null being 2 bytes
3970 | * for UCS-2 and UTF-16, 4 bytes for UCS-4, and 1 byte for other
3971 | * encodings).
3972 | */
3973 | static uint8_t *
3974 | tvb_get_ascii_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3975 | {
3976 | unsigned size;
3977 | const uint8_t *ptr;
3978 |
3979 | size = tvb_strsize(tvb, offset);
3980 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3981 | if (lengthp)
3982 | *lengthp = size;
3983 | return get_ascii_string(scope, ptr, size);
3984 | }
3985 |
3986 | static uint8_t *
3987 | tvb_get_iso_646_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
3988 | {
3989 | unsigned size;
3990 | const uint8_t *ptr;
3991 |
3992 | size = tvb_strsize(tvb, offset);
3993 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3994 | if (lengthp)
3995 | *lengthp = size;
3996 | return get_iso_646_string(scope, ptr, size, table);
3997 | }
3998 |
3999 | static uint8_t *
4000 | tvb_get_utf_8_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4001 | {
4002 | unsigned size;
4003 | const uint8_t *ptr;
4004 |
4005 | size = tvb_strsize(tvb, offset);
4006 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4007 | if (lengthp)
4008 | *lengthp = size;
4009 | return get_utf_8_string(scope, ptr, size);
4010 | }
4011 |
4012 | static uint8_t *
4013 | tvb_get_stringz_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4014 | {
4015 | unsigned size;
4016 | const uint8_t *ptr;
4017 |
4018 | size = tvb_strsize(tvb, offset);
4019 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4020 | if (lengthp)
4021 | *lengthp = size;
4022 | return get_8859_1_string(scope, ptr, size);
4023 | }
4024 |
4025 | static uint8_t *
4026 | tvb_get_stringz_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
4027 | {
4028 | unsigned size;
4029 | const uint8_t *ptr;
4030 |
4031 | size = tvb_strsize(tvb, offset);
4032 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4033 | if (lengthp)
4034 | *lengthp = size;
4035 | return get_unichar2_string(scope, ptr, size, table);
4036 | }
4037 |
4038 | /*
4039 | * Given a tvbuff and an offset, with the offset assumed to refer to
4040 | * a null-terminated string, find the length of that string (and throw
4041 | * an exception if the tvbuff ends before we find the null), ensure that
4042 | * the TVB is flat, and return a pointer to the string (in the TVB).
4043 | * Also return the length of the string (including the terminating null)
4044 | * through a pointer.
4045 | *
4046 | * As long as we aren't using composite TVBs, this saves the cycles used
4047 | * (often unnecessarily) in allocating a buffer and copying the string into
4048 | * it. OTOH, the string returned isn't valid UTF-8, so it shouldn't be
4049 | * added to the tree, the columns, etc., just used with various other
4050 | * functions that operate on strings that don't have a tvb_ equivalent.
4051 | * That's hard to enforce, which is why this is deprecated.
4052 | */
4053 | const uint8_t *
4054 | tvb_get_const_stringz(tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4055 | {
4056 | unsigned size;
4057 | const uint8_t *strptr;
4058 |
4059 | size = tvb_strsize(tvb, offset);
4060 | strptr = ensure_contiguous_unsigned(tvb, offset, size);
4061 | if (lengthp)
4062 | *lengthp = size;
4063 | return strptr;
4064 | }
4065 |
4066 | static char *
4067 | tvb_get_ucs_2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4068 | {
4069 | unsigned size; /* Number of bytes in string */
4070 | const uint8_t *ptr;
4071 |
4072 | size = tvb_unicode_strsize(tvb, offset);
4073 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4074 | if (lengthp)
4075 | *lengthp = size;
4076 | return (char*)get_ucs_2_string(scope, ptr, size, encoding);
4077 | }
4078 |
4079 | static char *
4080 | tvb_get_utf_16_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4081 | {
4082 | unsigned size;
4083 | const uint8_t *ptr;
4084 |
4085 | size = tvb_unicode_strsize(tvb, offset);
4086 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4087 | if (lengthp)
4088 | *lengthp = size;
4089 | return (char*)get_utf_16_string(scope, ptr, size, encoding);
4090 | }
4091 |
4092 | static char *
4093 | tvb_get_ucs_4_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4094 | {
4095 | unsigned size;
4096 | const uint8_t *ptr;
4097 |
4098 | size = tvb_ucs_4_strsize(tvb, offset);
4099 |
4100 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4101 | if (lengthp)
4102 | *lengthp = size;
4103 | return (char*)get_ucs_4_string(scope, ptr, size, encoding);
4104 | }
4105 |
4106 | static uint8_t *
4107 | tvb_get_nonascii_unichar2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[256])
4108 | {
4109 | unsigned size;
4110 | const uint8_t *ptr;
4111 |
4112 | size = tvb_strsize(tvb, offset);
4113 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4114 | if (lengthp)
4115 | *lengthp = size;
4116 | return get_nonascii_unichar2_string(scope, ptr, size, table);
4117 | }
4118 |
4119 | static uint8_t *
4120 | tvb_get_t61_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4121 | {
4122 | unsigned size;
4123 | const uint8_t *ptr;
4124 |
4125 | size = tvb_strsize(tvb, offset);
4126 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4127 | if (lengthp)
4128 | *lengthp = size;
4129 | return get_t61_string(scope, ptr, size);
4130 | }
4131 |
4132 | static uint8_t *
4133 | tvb_get_gb18030_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4134 | {
4135 | unsigned size;
4136 | const uint8_t *ptr;
4137 |
4138 | size = tvb_strsize(tvb, offset);
4139 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4140 | if (lengthp)
4141 | *lengthp = size;
4142 | return get_gb18030_string(scope, ptr, size);
4143 | }
4144 |
4145 | static uint8_t *
4146 | tvb_get_euc_kr_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4147 | {
4148 | unsigned size;
4149 | const uint8_t *ptr;
4150 |
4151 | size = tvb_strsize(tvb, offset);
4152 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4153 | if (lengthp)
4154 | *lengthp = size;
4155 | return get_euc_kr_string(scope, ptr, size);
4156 | }
4157 |
4158 | static uint8_t *
4159 | tvb_get_dect_standard_8bits_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4160 | {
4161 | unsigned size;
4162 | const uint8_t *ptr;
4163 |
4164 | size = tvb_strsize(tvb, offset);
4165 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4166 | if (lengthp)
4167 | *lengthp = size;
4168 | return get_dect_standard_8bits_string(scope, ptr, size);
4169 | }
4170 |
4171 | uint8_t *
4172 | tvb_get_stringz_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4173 | {
4174 | uint8_t *strptr;
4175 |
4176 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4176, "tvb && tvb->initialized" ))));
4177 |
4178 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
4179 |
4180 | case ENC_ASCII0x00000000:
4181 | default:
4182 | /*
4183 | * For now, we treat bogus values as meaning
4184 | * "ASCII" rather than reporting an error,
4185 | * for the benefit of old dissectors written
4186 | * when the last argument to proto_tree_add_item()
4187 | * was a bool for the byte order, not an
4188 | * encoding value, and passed non-zero values
4189 | * other than true to mean "little-endian".
4190 | */
4191 | strptr = tvb_get_ascii_stringz(scope, tvb, offset, lengthp);
4192 | break;
4193 |
4194 | case ENC_UTF_80x00000002:
4195 | strptr = tvb_get_utf_8_stringz(scope, tvb, offset, lengthp);
4196 | break;
4197 |
4198 | case ENC_UTF_160x00000004:
4199 | strptr = (uint8_t*)tvb_get_utf_16_stringz(scope, tvb, offset, lengthp,
4200 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4201 | break;
4202 |
4203 | case ENC_UCS_20x00000006:
4204 | strptr = (uint8_t*)tvb_get_ucs_2_stringz(scope, tvb, offset, lengthp,
4205 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4206 | break;
4207 |
4208 | case ENC_UCS_40x00000008:
4209 | strptr = (uint8_t*)tvb_get_ucs_4_stringz(scope, tvb, offset, lengthp,
4210 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4211 | break;
4212 |
4213 | case ENC_ISO_8859_10x0000000A:
4214 | /*
4215 | * ISO 8859-1 printable code point values are equal
4216 | * to the equivalent Unicode code point value, so
4217 | * no translation table is needed.
4218 | */
4219 | strptr = tvb_get_stringz_8859_1(scope, tvb, offset, lengthp);
4220 | break;
4221 |
4222 | case ENC_ISO_8859_20x0000000C:
4223 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_2);
4224 | break;
4225 |
4226 | case ENC_ISO_8859_30x0000000E:
4227 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_3);
4228 | break;
4229 |
4230 | case ENC_ISO_8859_40x00000010:
4231 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_4);
4232 | break;
4233 |
4234 | case ENC_ISO_8859_50x00000012:
4235 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_5);
4236 | break;
4237 |
4238 | case ENC_ISO_8859_60x00000014:
4239 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_6);
4240 | break;
4241 |
4242 | case ENC_ISO_8859_70x00000016:
4243 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_7);
4244 | break;
4245 |
4246 | case ENC_ISO_8859_80x00000018:
4247 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_8);
4248 | break;
4249 |
4250 | case ENC_ISO_8859_90x0000001A:
4251 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_9);
4252 | break;
4253 |
4254 | case ENC_ISO_8859_100x0000001C:
4255 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_10);
4256 | break;
4257 |
4258 | case ENC_ISO_8859_110x0000001E:
4259 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_11);
4260 | break;
4261 |
4262 | case ENC_ISO_8859_130x00000022:
4263 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_13);
4264 | break;
4265 |
4266 | case ENC_ISO_8859_140x00000024:
4267 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_14);
4268 | break;
4269 |
4270 | case ENC_ISO_8859_150x00000026:
4271 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_15);
4272 | break;
4273 |
4274 | case ENC_ISO_8859_160x00000028:
4275 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_16);
4276 | break;
4277 |
4278 | case ENC_WINDOWS_12500x0000002A:
4279 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1250);
4280 | break;
4281 |
4282 | case ENC_WINDOWS_12510x0000003C:
4283 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1251);
4284 | break;
4285 |
4286 | case ENC_WINDOWS_12520x0000003A:
4287 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1252);
4288 | break;
4289 |
4290 | case ENC_MAC_ROMAN0x00000030:
4291 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_mac_roman);
4292 | break;
4293 |
4294 | case ENC_CP4370x00000032:
4295 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp437);
4296 | break;
4297 |
4298 | case ENC_CP8550x0000003E:
4299 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp855);
4300 | break;
4301 |
4302 | case ENC_CP8660x00000040:
4303 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp866);
4304 | break;
4305 |
4306 | case ENC_ISO_646_BASIC0x00000042:
4307 | strptr = tvb_get_iso_646_stringz(scope, tvb, offset, lengthp, charset_table_iso_646_basic);
4308 | break;
4309 |
4310 | case ENC_BCD_DIGITS_0_90x00000044:
4311 | case ENC_KEYPAD_ABC_TBCD0x00000046:
4312 | case ENC_KEYPAD_BC_TBCD0x00000048:
4313 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
4314 | REPORT_DISSECTOR_BUG("Null-terminated strings are not supported for BCD encodings.")proto_report_dissector_bug("Null-terminated strings are not supported for BCD encodings." );
4315 | break;
4316 |
4317 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
4318 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
4319 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
4320 | 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" );
4321 | break;
4322 |
4323 | case ENC_ASCII_7BITS0x00000034:
4324 | 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" );
4325 | break;
4326 |
4327 | case ENC_EBCDIC0x0000002E:
4328 | /*
4329 | * "Common" EBCDIC, covering all characters with the
4330 | * same code point in all Roman-alphabet EBCDIC code
4331 | * pages.
4332 | */
4333 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic);
4334 | break;
4335 |
4336 | case ENC_EBCDIC_CP0370x00000038:
4337 | /*
4338 | * EBCDIC code page 037.
4339 | */
4340 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp037);
4341 | break;
4342 |
4343 | case ENC_EBCDIC_CP5000x00000060:
4344 | /*
4345 | * EBCDIC code page 500.
4346 | */
4347 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp500);
4348 | break;
4349 |
4350 | case ENC_T610x00000036:
4351 | strptr = tvb_get_t61_stringz(scope, tvb, offset, lengthp);
4352 | break;
4353 |
4354 | case ENC_GB180300x00000050:
4355 | strptr = tvb_get_gb18030_stringz(scope, tvb, offset, lengthp);
4356 | break;
4357 |
4358 | case ENC_EUC_KR0x00000052:
4359 | strptr = tvb_get_euc_kr_stringz(scope, tvb, offset, lengthp);
4360 | break;
4361 |
4362 | case ENC_APN_STR0x00000054:
4363 | /* At least as defined in 3GPP TS 23.003 Clause 9.1, null-termination
4364 | * does make sense as internal nulls are not allowed. */
4365 | REPORT_DISSECTOR_BUG("Null-terminated strings not implemented for ENC_APN_STR")proto_report_dissector_bug("Null-terminated strings not implemented for ENC_APN_STR" );
4366 | break;
4367 |
4368 | case ENC_DECT_STANDARD_8BITS0x00000056:
4369 | strptr = tvb_get_dect_standard_8bits_stringz(scope, tvb, offset, lengthp);
4370 | break;
4371 | }
4372 |
4373 | return strptr;
4374 | }
4375 |
4376 | /* Looks for a stringz (NUL-terminated string) in tvbuff and copies
4377 | * no more than bufsize number of bytes, including terminating NUL, to buffer.
4378 | * Returns length of string (not including terminating NUL).
4379 | * In this way, it acts like snprintf().
4380 | *
4381 | * bufsize MUST be greater than 0.
4382 | *
4383 | * This function does not otherwise throw an exception for running out of room
4384 | * in the buffer or running out of remaining bytes in the tvbuffer. It will
4385 | * copy as many bytes to the buffer as possible (the lesser of bufsize - 1
4386 | * and the number of remaining captured bytes) and then NUL terminate the
4387 | * string.
4388 | *
4389 | * *bytes_copied will contain the number of bytes actually copied,
4390 | * including the terminating-NUL if present in the frame, but not
4391 | * if it was supplied by the function instead of copied from packet data.
4392 | * [Not currently used, but could be used to determine how much to advance
4393 | * the offset.]
4394 | */
4395 | static unsigned
4396 | _tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const unsigned offset, const unsigned bufsize, uint8_t* buffer, unsigned *bytes_copied)
4397 | {
4398 | int exception;
4399 | int stringlen;
4400 | unsigned limit;
4401 | unsigned len = 0;
4402 |
4403 | /* Only read to end of tvbuff, w/o throwing exception. */
4404 | exception = validate_offset_and_remaining(tvb, offset, &len);
4405 | if (exception)
4406 | THROW(exception)except_throw(1, (exception), ((void*)0));
4407 |
4408 | /* There must at least be room for the terminating NUL. */
4409 | DISSECTOR_ASSERT(bufsize != 0)((void) ((bufsize != 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4409, "bufsize != 0" ))));
4410 |
4411 | /* If there's no room for anything else, just return the NUL. */
4412 | if (bufsize == 1) {
4413 | buffer[0] = 0;
4414 | if (len && tvb_get_uint8(tvb, offset) == 0) {
4415 | *bytes_copied = 1;
4416 | } else {
4417 | *bytes_copied = 0;
4418 | }
4419 | return 0;
4420 | }
4421 |
4422 | /* validate_offset_and_remaining() won't throw an exception if we're
4423 | * looking at the byte immediately after the end of the tvbuff. */
4424 | if (len == 0) {
4425 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
4426 | }
4427 |
4428 | if (len < bufsize) {
4429 | limit = len;
4430 | }
4431 | else {
4432 | limit = bufsize - 1;
4433 | }
4434 |
4435 | stringlen = tvb_strnlen(tvb, offset, limit);
4436 | /* If NUL wasn't found, copy the data up to the limit and terminate */
4437 | if (stringlen == -1) {
4438 | tvb_memcpy(tvb, buffer, offset, limit);
4439 | buffer[limit] = 0;
4440 | *bytes_copied = limit;
4441 | return limit;
4442 | }
4443 |
4444 | /* Copy the string to buffer */
4445 | tvb_memcpy(tvb, buffer, offset, stringlen + 1);
4446 | *bytes_copied = stringlen + 1;
4447 | return (unsigned)stringlen;
4448 | }
4449 |
4450 | unsigned
4451 | tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const unsigned offset, const unsigned bufsize, uint8_t* buffer)
4452 | {
4453 | unsigned bytes_copied;
4454 |
4455 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4455, "tvb && tvb->initialized" ))));
4456 |
4457 | return _tvb_get_raw_bytes_as_stringz(tvb, offset, bufsize, buffer, &bytes_copied);
4458 | }
4459 |
4460 | /*
4461 | * Given a tvbuff, an offset into the tvbuff, a buffer, and a buffer size,
4462 | * extract as many raw bytes from the tvbuff, starting at the offset,
4463 | * as 1) are available in the tvbuff and 2) will fit in the buffer, leaving
4464 | * room for a terminating NUL.
4465 | */
4466 | unsigned
4467 | tvb_get_raw_bytes_as_string(tvbuff_t *tvb, const unsigned offset, char *buffer, size_t bufsize)
4468 | {
4469 | unsigned len = 0;
4470 |
4471 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4471, "tvb && tvb->initialized" ))));
4472 |
4473 | /* There must be room for the string and the terminating NUL. */
4474 | DISSECTOR_ASSERT(bufsize > 0)((void) ((bufsize > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4474, "bufsize > 0" ))));
4475 |
4476 | /* bufsize is size_t, but tvbuffers only have up to unsigned bytes */
4477 | DISSECTOR_ASSERT(bufsize - 1 < UINT_MAX)((void) ((bufsize - 1 < (2147483647 *2U +1U)) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c" , 4477, "bufsize - 1 < (2147483647 *2U +1U)"))));
4478 |
4479 | len = _tvb_captured_length_remaining(tvb, offset);
4480 | if (len == 0) {
4481 | buffer[0] = '\0';
4482 | return 0;
4483 | }
4484 | if (len > (bufsize - 1))
4485 | len = (unsigned)(bufsize - 1);
4486 |
4487 | /* Copy the string to buffer */
4488 | tvb_memcpy(tvb, buffer, offset, len);
4489 | buffer[len] = '\0';
4490 | return len;
4491 | }
4492 |
4493 | bool_Bool
4494 | tvb_ascii_isprint(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4495 | {
4496 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4496, "tvb && tvb->initialized" ))));
4497 |
4498 | /* XXX - Perhaps this function should return false instead of throwing
4499 | * an exception. */
4500 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4501 |
4502 | for (unsigned i = 0; i < length; i++, buf++)
4503 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4504 | return false0;
4505 |
4506 | return true1;
4507 | }
4508 |
4509 | bool_Bool
4510 | tvb_ascii_isprint_remaining(tvbuff_t *tvb, const unsigned offset)
4511 | {
4512 | int exception;
4513 | unsigned length;
4514 |
4515 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4515, "tvb && tvb->initialized" ))));
4516 |
4517 | exception = validate_offset_and_remaining(tvb, offset, &length);
4518 | if (exception)
4519 | THROW(exception)except_throw(1, (exception), ((void*)0));
4520 |
4521 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4522 |
4523 | for (unsigned i = 0; i < length; i++, buf++)
4524 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4525 | return false0;
4526 |
4527 | return true1;
4528 | }
4529 |
4530 | bool_Bool
4531 | tvb_utf_8_isprint(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4532 | {
4533 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4533, "tvb && tvb->initialized" ))));
4534 |
4535 | /* XXX - Perhaps this function should return false instead of throwing
4536 | * an exception. */
4537 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4538 |
4539 | return isprint_utf8_string((const char*)buf, length);
4540 | }
4541 |
4542 | bool_Bool
4543 | tvb_utf_8_isprint_remaining(tvbuff_t *tvb, const unsigned offset)
4544 | {
4545 | int exception;
4546 | unsigned length;
4547 |
4548 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4548, "tvb && tvb->initialized" ))));
4549 |
4550 | exception = validate_offset_and_remaining(tvb, offset, &length);
4551 | if (exception)
4552 | THROW(exception)except_throw(1, (exception), ((void*)0));
4553 |
4554 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4555 |
4556 | return isprint_utf8_string((const char*)buf, length);
4557 | }
4558 |
4559 | bool_Bool
4560 | tvb_ascii_isdigit(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4561 | {
4562 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4562, "tvb && tvb->initialized" ))));
4563 |
4564 | /* XXX - Perhaps this function should return false instead of throwing
4565 | * an exception. */
4566 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4567 |
4568 | for (unsigned i = 0; i < length; i++, buf++)
4569 | if (!g_ascii_isdigit(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_DIGIT) != 0))
4570 | return false0;
4571 |
4572 | return true1;
4573 | }
4574 |
4575 | static ws_mempbrk_pattern pbrk_crlf;
4576 |
4577 | static bool_Bool
4578 | _tvb_find_line_end_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, unsigned *linelen, unsigned *next_offset)
4579 | {
4580 | static bool_Bool compiled = false0;
4581 | unsigned eob_offset;
4582 | unsigned eol_offset;
4583 | unsigned char found_needle = 0;
4584 |
4585 | if (!compiled) {
4586 | ws_mempbrk_compile(&pbrk_crlf, "\r\n");
4587 | compiled = true1;
4588 | }
4589 |
4590 | eob_offset = offset + limit;
4591 |
4592 | /*
4593 | * Look either for a CR or an LF.
4594 | */
4595 | if (!_tvb_ws_mempbrk_uint8_length(tvb, offset, limit, &pbrk_crlf, &eol_offset, &found_needle)) {
4596 | /*
4597 | * No CR or LF - line is presumably continued in next packet.
4598 | */
4599 | /*
4600 | * Pretend the line runs to the end of the tvbuff.
4601 | */
4602 | if (linelen)
4603 | *linelen = eob_offset - offset;
4604 | if (next_offset)
4605 | *next_offset = eob_offset;
4606 | /*
4607 | * Tell our caller we saw no EOL, so they can try to
4608 | * desegment and get the entire line into one tvbuff.
4609 | */
4610 | return false0;
4611 | } else {
4612 | /*
4613 | * Find the number of bytes between the starting offset
4614 | * and the CR or LF.
4615 | */
4616 | if (linelen)
4617 | *linelen = eol_offset - offset;
4618 |
4619 | /*
4620 | * Is it a CR?
4621 | */
4622 | if (found_needle == '\r') {
4623 | /*
4624 | * Yes - is it followed by an LF?
4625 | */
4626 | if (eol_offset + 1 >= eob_offset) {
4627 | /*
4628 | * Dunno - the next byte isn't in this
4629 | * tvbuff.
4630 | */
4631 | if (next_offset)
4632 | *next_offset = eob_offset;
4633 | /*
4634 | * We'll return false, although that
4635 | * runs the risk that if the line
4636 | * really *is* terminated with a CR,
4637 | * we won't properly dissect this
4638 | * tvbuff.
4639 | *
4640 | * It's probably more likely that
4641 | * the line ends with CR-LF than
4642 | * that it ends with CR by itself.
4643 | *
4644 | * XXX - Return a third value?
4645 | */
4646 | return false0;
4647 | } else {
4648 | /*
4649 | * Well, we can at least look at the next
4650 | * byte.
4651 | */
4652 | if (tvb_get_uint8(tvb, eol_offset + 1) == '\n') {
4653 | /*
4654 | * It's an LF; skip over the CR.
4655 | */
4656 | eol_offset++;
4657 | }
4658 | }
4659 | }
4660 |
4661 | /*
4662 | * Return the offset of the character after the last
4663 | * character in the line, skipping over the last character
4664 | * in the line terminator.
4665 | */
4666 | if (next_offset)
4667 | *next_offset = eol_offset + 1;
4668 | }
4669 | return true1;
4670 | }
4671 |
4672 | /*
4673 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4674 | * at that offset (which may be -1 for "all the way to the end of the
4675 | * tvbuff"), find the end of the (putative) line that starts at the
4676 | * specified offset in the tvbuff, going no further than the specified
4677 | * length.
4678 | *
4679 | * Return the length of the line (not counting the line terminator at
4680 | * the end), or, if we don't find a line terminator:
4681 | *
4682 | * if "desegment" is true, return -1;
4683 | *
4684 | * if "desegment" is false, return the amount of data remaining in
4685 | * the buffer.
4686 | *
4687 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4688 | * character past the line terminator, or past the end of the buffer if
4689 | * we don't find a line terminator. (It's not set if we return -1.)
4690 | */
4691 | int
4692 | tvb_find_line_end(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset, const bool_Bool desegment)
4693 | {
4694 | unsigned linelen;
4695 | unsigned abs_next_offset;
4696 | unsigned limit;
4697 | int exception;
4698 |
4699 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4699, "tvb && tvb->initialized" ))));
4700 |
4701 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4702 | if (exception)
4703 | THROW(exception)except_throw(1, (exception), ((void*)0));
4704 |
4705 | /* Only search to end of tvbuff, w/o throwing exception. */
4706 | if (len >= 0 && limit > (unsigned) len) {
4707 | /* Maximum length doesn't go past end of tvbuff; search
4708 | to that value. */
4709 | limit = (unsigned) len;
4710 | }
4711 |
4712 | if (!_tvb_find_line_end_length(tvb, offset, limit, &linelen, &abs_next_offset) && desegment) {
4713 | return -1;
4714 | }
4715 | if (next_offset) {
4716 | *next_offset = (int)abs_next_offset;
4717 | }
4718 | return (int)linelen;
4719 | }
4720 |
4721 | bool_Bool
4722 | tvb_find_line_end_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *linelen, unsigned *next_offset)
4723 | {
4724 | unsigned limit;
4725 | int exception;
4726 |
4727 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4727, "tvb && tvb->initialized" ))));
4728 |
4729 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4730 | if (exception)
4731 | THROW(exception)except_throw(1, (exception), ((void*)0));
4732 |
4733 | return _tvb_find_line_end_length(tvb, offset, limit, linelen, next_offset);
4734 | }
4735 |
4736 | bool_Bool
4737 | tvb_find_line_end_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *linelen, unsigned *next_offset)
4738 | {
4739 | unsigned limit;
4740 | int exception;
4741 |
4742 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4742, "tvb && tvb->initialized" ))));
4743 |
4744 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4745 | if (exception)
4746 | THROW(exception)except_throw(1, (exception), ((void*)0));
4747 |
4748 | /* Only search to end of tvbuff, w/o throwing exception. */
4749 | if (limit > maxlength) {
4750 | /* Maximum length doesn't go past end of tvbuff; search
4751 | to that value. */
4752 | limit = maxlength;
4753 | }
4754 |
4755 | return _tvb_find_line_end_length(tvb, offset, limit, linelen, next_offset);
4756 | }
4757 |
4758 | static ws_mempbrk_pattern pbrk_crlf_dquote;
4759 |
4760 | static bool_Bool
4761 | _tvb_find_line_end_unquoted_length(tvbuff_t *tvb, const unsigned offset, unsigned limit, unsigned *linelen, unsigned *next_offset)
4762 | {
4763 | unsigned cur_offset, char_offset;
4764 | bool_Bool is_quoted;
4765 | unsigned char c = 0;
4766 | unsigned eob_offset;
4767 | static bool_Bool compiled = false0;
4768 | unsigned len;
4769 | bool_Bool found;
4770 |
4771 | if (!compiled) {
4772 | ws_mempbrk_compile(&pbrk_crlf_dquote, "\r\n\"");
4773 | compiled = true1;
4774 | }
4775 |
4776 | eob_offset = offset + limit;
4777 |
4778 | cur_offset = offset;
4779 | is_quoted = false0;
4780 | for (;;) {
4781 | len = limit - (cur_offset - offset);
4782 | /*
4783 | * Is this part of the string quoted?
4784 | */
4785 | if (is_quoted) {
4786 | /*
4787 | * Yes - look only for the terminating quote.
4788 | */
4789 | found = _tvb_find_uint8_length(tvb, cur_offset, len, '"', &char_offset);
4790 | } else {
4791 | /*
4792 | * Look either for a CR, an LF, or a '"'.
4793 | */
4794 | found = _tvb_ws_mempbrk_uint8_length(tvb, cur_offset, len, &pbrk_crlf_dquote, &char_offset, &c);
4795 | }
4796 | if (!found) {
4797 | /*
4798 | * Not found - line is presumably continued in
4799 | * next packet.
4800 | * We pretend the line runs to the end of the tvbuff.
4801 | */
4802 | if (linelen)
4803 | *linelen = eob_offset - offset;
4804 | if (next_offset)
4805 | *next_offset = eob_offset;
4806 | break;
4807 | }
4808 |
4809 | if (is_quoted) {
4810 | /*
4811 | * We're processing a quoted string.
4812 | * We only looked for ", so we know it's a ";
4813 | * as we're processing a quoted string, it's a
4814 | * closing quote.
4815 | */
4816 | is_quoted = false0;
4817 | } else {
4818 | /*
4819 | * OK, what is it?
4820 | */
4821 | if (c == '"') {
4822 | /*
4823 | * Un-quoted "; it begins a quoted
4824 | * string.
4825 | */
4826 | is_quoted = true1;
4827 | } else {
4828 | /*
4829 | * It's a CR or LF; we've found a line
4830 | * terminator.
4831 | *
4832 | * Find the number of bytes between the
4833 | * starting offset and the CR or LF.
4834 | */
4835 | if (linelen)
4836 | *linelen = char_offset - offset;
4837 |
4838 | /*
4839 | * Is it a CR?
4840 | */
4841 | if (c == '\r') {
4842 | /*
4843 | * Yes; is it followed by an LF?
4844 | */
4845 | if (char_offset + 1 < eob_offset &&
4846 | tvb_get_uint8(tvb, char_offset + 1)
4847 | == '\n') {
4848 | /*
4849 | * Yes; skip over the CR.
4850 | */
4851 | char_offset++;
4852 | }
4853 | }
4854 |
4855 | /*
4856 | * Return the offset of the character after
4857 | * the last character in the line, skipping
4858 | * over the last character in the line
4859 | * terminator, and quit.
4860 | */
4861 | if (next_offset)
4862 | *next_offset = char_offset + 1;
4863 | break;
4864 | }
4865 | }
4866 |
4867 | /*
4868 | * Step past the character we found.
4869 | */
4870 | cur_offset = char_offset + 1;
4871 | if (cur_offset >= eob_offset) {
4872 | /*
4873 | * The character we found was the last character
4874 | * in the tvbuff - line is presumably continued in
4875 | * next packet.
4876 | * We pretend the line runs to the end of the tvbuff.
4877 | */
4878 | if (linelen)
4879 | *linelen = eob_offset - offset;
4880 | if (next_offset)
4881 | *next_offset = eob_offset;
4882 | break;
4883 | }
4884 | }
4885 | return found;
4886 | }
4887 |
4888 | /*
4889 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4890 | * at that offset (which may be -1 for "all the way to the end of the
4891 | * tvbuff"), find the end of the (putative) line that starts at the
4892 | * specified offset in the tvbuff, going no further than the specified
4893 | * length.
4894 | *
4895 | * However, treat quoted strings inside the buffer specially - don't
4896 | * treat newlines in quoted strings as line terminators.
4897 | *
4898 | * Return the length of the line (not counting the line terminator at
4899 | * the end), or the amount of data remaining in the buffer if we don't
4900 | * find a line terminator.
4901 | *
4902 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4903 | * character past the line terminator, or past the end of the buffer if
4904 | * we don't find a line terminator.
4905 | */
4906 | int
4907 | tvb_find_line_end_unquoted(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset)
4908 | {
4909 | unsigned linelen;
4910 | unsigned abs_next_offset;
4911 | unsigned limit;
4912 | int exception;
4913 |
4914 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4914, "tvb && tvb->initialized" ))));
4915 |
4916 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4917 | if (exception)
4918 | THROW(exception)except_throw(1, (exception), ((void*)0));
4919 |
4920 | /* Only search to end of tvbuff, w/o throwing exception. */
4921 | if (len >= 0 && limit > (unsigned) len) {
4922 | /* Maximum length doesn't go past end of tvbuff; search
4923 | to that value. */
4924 | limit = (unsigned) len;
4925 | }
4926 |
4927 | _tvb_find_line_end_unquoted_length(tvb, offset, limit, &linelen, &abs_next_offset);
4928 | if (next_offset) {
4929 | *next_offset = (int)abs_next_offset;
4930 | }
4931 | return (int)linelen;
4932 | }
4933 |
4934 | bool_Bool
4935 | tvb_find_line_end_unquoted_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *linelen, unsigned *next_offset)
4936 | {
4937 | unsigned limit;
4938 | int exception;
4939 |
4940 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4940, "tvb && tvb->initialized" ))));
4941 |
4942 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4943 | if (exception)
4944 | THROW(exception)except_throw(1, (exception), ((void*)0));
4945 |
4946 | return _tvb_find_line_end_unquoted_length(tvb, offset, limit, linelen, next_offset);
4947 | }
4948 |
4949 | bool_Bool
4950 | tvb_find_line_end_unquoted_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *linelen, unsigned *next_offset)
4951 | {
4952 | unsigned limit;
4953 | int exception;
4954 |
4955 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4955, "tvb && tvb->initialized" ))));
4956 |
4957 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4958 | if (exception)
4959 | THROW(exception)except_throw(1, (exception), ((void*)0));
4960 |
4961 | /* Only search to end of tvbuff, w/o throwing exception. */
4962 | if (limit > maxlength) {
4963 | /* Maximum length doesn't go past end of tvbuff; search
4964 | to that value. */
4965 | limit = maxlength;
4966 | }
4967 |
4968 | return _tvb_find_line_end_unquoted_length(tvb, offset, limit, linelen, next_offset);
4969 | }
4970 |
4971 | /*
4972 | * Copied from the mgcp dissector. (This function should be moved to /epan )
4973 | * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
4974 | * character following offset or offset + maxlength -1 whichever
4975 | * is smaller.
4976 | *
4977 | * Parameters:
4978 | * tvb - The tvbuff in which we are skipping whitespace.
4979 | * offset - The offset in tvb from which we begin trying to skip whitespace.
4980 | * maxlength - The maximum distance from offset that we may try to skip
4981 | * whitespace.
4982 | *
4983 | * Returns: The position in tvb of the first non-whitespace
4984 | * character following offset or offset + maxlength -1 whichever
4985 | * is smaller.
4986 | */
4987 | unsigned
4988 | tvb_skip_wsp(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength)
4989 | {
4990 | unsigned counter;
4991 | unsigned end, tvb_len;
4992 | uint8_t tempchar;
4993 |
4994 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4994, "tvb && tvb->initialized" ))));
4995 |
4996 | /* Get the length remaining */
4997 | /*tvb_len = tvb_captured_length(tvb);*/
4998 | tvb_len = tvb->length;
4999 |
5000 | if (ckd_add(&end, offset, maxlength)__builtin_add_overflow((offset), (maxlength), (&end)) || end > tvb_len) {
5001 | end = tvb_len;
5002 | }
5003 |
5004 | /* Skip past spaces, tabs, CRs and LFs until run out or meet something else */
5005 | /* XXX - The MEGACO dissector uses g_ascii_isspace(), which might be
5006 | * slightly faster but also tests for vertical tab and form feed. */
5007 | for (counter = offset;
5008 | counter < end &&
5009 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
5010 | tempchar == '\t' || tempchar == '\r' || tempchar == '\n');
5011 | counter++);
5012 |
5013 | return counter;
5014 | }
5015 |
5016 | unsigned
5017 | tvb_skip_wsp_return(tvbuff_t *tvb, const unsigned offset)
5018 | {
5019 | unsigned counter;
5020 | uint8_t tempchar;
5021 |
5022 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5022, "tvb && tvb->initialized" ))));
5023 |
5024 | /* XXX - DISSECTOR_ASSERT(offset > 0) and then subtract 1 from offset?
5025 | * The way this is used the caller almost always wants to subtract one
5026 | * from the offset of a non WSP separator, and they might forget to do
5027 | * so and then this function return the offset past the separator. */
5028 |
5029 | /* XXX - The MEGACO dissector uses g_ascii_isspace(), which might be
5030 | * slightly faster but also tests for vertical tab and form feed. */
5031 | for (counter = offset; counter > 0 &&
5032 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
5033 | tempchar == '\t' || tempchar == '\n' || tempchar == '\r'); counter--);
5034 | counter++;
5035 |
5036 | return counter;
5037 | }
5038 |
5039 | unsigned
5040 | tvb_skip_uint8(tvbuff_t *tvb, unsigned offset, const unsigned maxlength, const uint8_t ch)
5041 | {
5042 | unsigned end, tvb_len;
5043 |
5044 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5044, "tvb && tvb->initialized" ))));
5045 |
5046 | /* Get the length remaining */
5047 | /*tvb_len = tvb_captured_length(tvb);*/
5048 | tvb_len = tvb->length;
5049 |
5050 | if (ckd_add(&end, offset, maxlength)__builtin_add_overflow((offset), (maxlength), (&end)) || end > tvb_len) {
5051 | end = tvb_len;
5052 | }
5053 |
5054 | while (offset < end) {
5055 | uint8_t tempch = tvb_get_uint8(tvb, offset);
5056 |
5057 | if (tempch != ch)
5058 | break;
5059 | offset++;
5060 | }
5061 |
5062 | return offset;
5063 | }
5064 |
5065 | static ws_mempbrk_pattern pbrk_whitespace;
5066 |
5067 | static bool_Bool
5068 | _tvb_get_token_len_length(tvbuff_t *tvb, const unsigned offset, unsigned limit, unsigned *tokenlen, unsigned *next_offset)
5069 | {
5070 | unsigned eot_offset;
5071 | unsigned char found_needle = 0;
5072 | static bool_Bool compiled = false0;
5073 |
5074 | if (!compiled) {
5075 | ws_mempbrk_compile(&pbrk_whitespace, " \r\n");
5076 | compiled = true1;
5077 | }
5078 |
5079 | /*
5080 | * Look either for a space, CR, or LF.
5081 | */
5082 | if (!_tvb_ws_mempbrk_uint8_length(tvb, offset, limit, &pbrk_whitespace, &eot_offset, &found_needle)) {
5083 | /*
5084 | * No space, CR or LF - token is presumably continued in next packet.
5085 | */
5086 | /*
5087 | * Pretend the token runs to the end of the tvbuff.
5088 | */
5089 | if (tokenlen)
5090 | *tokenlen = eot_offset - offset;
5091 | if (next_offset)
5092 | *next_offset = eot_offset;
5093 | /*
5094 | * Tell our caller we saw no whitespace, so they can
5095 | * try to desegment and get the entire line
5096 | * into one tvbuff.
5097 | */
5098 | return false0;
5099 | }
5100 |
5101 | /*
5102 | * Find the number of bytes between the starting offset
5103 | * and the space, CR or LF.
5104 | */
5105 | if (tokenlen)
5106 | *tokenlen = eot_offset - offset;
5107 |
5108 | /*
5109 | * Return the offset of the character after the token delimiter,
5110 | * skipping over the last character in the separator.
5111 | *
5112 | * XXX - get_token_len() from strutil.h returns the start offset of
5113 | * the next token by skipping trailing spaces (but not spaces that
5114 | * follow a CR or LF, only consecutive spaces). Should we align
5115 | * the two functions? Most dissectors want to skip extra spaces,
5116 | * and while the dissector _can_ follow up with tvb_skip_wsp, this
5117 | * probably causes dissectors to use tvb_get_ptr + get_token_len,
5118 | * which we want to discourage. OTOH, IMAP, which uses this, says
5119 | * "in all cases, SP refers to exactly one space. It is NOT permitted
5120 | * to substitute TAB, insert additional spaces, or otherwise treat
5121 | * SP as being equivalent to linear whitespace (LWSP)."
5122 | * https://www.rfc-editor.org/rfc/rfc9051.html#name-formal-syntax
5123 | *
5124 | * XXX - skip over CR-LF as a unit like tvb_find_line_end()?
5125 | * get_token_len() doesn't, probably because most dissectors have
5126 | * already found the line end before, but it probably makes sense
5127 | * to do and unlike above it's unlikely it would break any protocol
5128 | * (and might even fix some.)
5129 | */
5130 | if (next_offset)
5131 | *next_offset = eot_offset + 1;
5132 |
5133 | return true1;
5134 | }
5135 |
5136 | int tvb_get_token_len(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset, const bool_Bool desegment)
5137 | {
5138 | unsigned tokenlen;
5139 | unsigned abs_next_offset;
5140 | unsigned limit;
5141 | int exception;
5142 |
5143 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5143, "tvb && tvb->initialized" ))));
5144 |
5145 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5146 | if (exception)
5147 | THROW(exception)except_throw(1, (exception), ((void*)0));
5148 |
5149 | /* Only search to end of tvbuff, w/o throwing exception. */
5150 | if (len >= 0 && limit > (unsigned) len) {
5151 | /* Maximum length doesn't go past end of tvbuff; search
5152 | to that value. */
5153 | limit = (unsigned) len;
5154 | }
5155 |
5156 | if (!_tvb_get_token_len_length(tvb, offset, limit, &tokenlen, &abs_next_offset) && desegment) {
5157 | return -1;
5158 | }
5159 | if (next_offset) {
5160 | *next_offset = (int)abs_next_offset;
5161 | }
5162 | return (int)tokenlen;
5163 | }
5164 |
5165 | bool_Bool
5166 | tvb_get_token_len_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *tokenlen, unsigned *next_offset)
5167 | {
5168 | unsigned limit;
5169 | int exception;
5170 |
5171 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5171, "tvb && tvb->initialized" ))));
5172 |
5173 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5174 | if (exception)
5175 | THROW(exception)except_throw(1, (exception), ((void*)0));
5176 |
5177 | return _tvb_get_token_len_length(tvb, offset, limit, tokenlen, next_offset);
5178 | }
5179 |
5180 | bool_Bool
5181 | tvb_get_token_len_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *tokenlen, unsigned *next_offset)
5182 | {
5183 | unsigned limit;
5184 | int exception;
5185 |
5186 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5186, "tvb && tvb->initialized" ))));
5187 |
5188 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5189 | if (exception)
5190 | THROW(exception)except_throw(1, (exception), ((void*)0));
5191 |
5192 | /* Only search to end of tvbuff, w/o throwing exception. */
5193 | if (limit > maxlength) {
5194 | /* Maximum length doesn't go past end of tvbuff; search
5195 | to that value. */
5196 | limit = maxlength;
5197 | }
5198 |
5199 | return _tvb_get_token_len_length(tvb, offset, limit, tokenlen, next_offset);
5200 | }
5201 |
5202 | /*
5203 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
5204 | * to the string with the formatted data, with "punct" as a byte
5205 | * separator.
5206 | */
5207 | char *
5208 | tvb_bytes_to_str_punct(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned len, const char punct)
5209 | {
5210 | return bytes_to_str_punct(scope, ensure_contiguous_unsigned(tvb, offset, len), len, punct)bytes_to_str_punct_maxlen(scope, ensure_contiguous_unsigned(tvb , offset, len), len, punct, 24);
5211 | }
5212 |
5213 | /*
5214 | * Given a wmem scope, a tvbuff, an offset, a length, an input digit
5215 | * set, and a boolean indicator, fetch BCD-encoded digits from a
5216 | * tvbuff starting from either the low or high half byte of the
5217 | * first byte depending on the boolean indicator (true means "start
5218 | * with the high half byte, ignoring the low half byte", and false
5219 | * means "start with the low half byte and proceed to the high half
5220 | * byte), formating the digits into characters according to the
5221 | * input digit set, and return a pointer to a UTF-8 string, allocated
5222 | * using the wmem scope. A nibble of 0xf is considered a 'filler'
5223 | * and will end the conversion. Similarly if odd is set the last
5224 | * high nibble will be omitted. (Note that if both skip_first and
5225 | * odd are true, then both the first and last semi-octet are skipped,
5226 | * i.e. an even number of nibbles are considered.)
5227 | */
5228 | char *
5229 | tvb_get_bcd_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned len, const dgt_set_t *dgt, bool_Bool skip_first, bool_Bool odd, bool_Bool bigendian)
5230 | {
5231 | const uint8_t *ptr;
5232 | int i = 0;
5233 | char *digit_str;
5234 | uint8_t octet, nibble;
5235 |
5236 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5236, "tvb && tvb->initialized" ))));
5237 |
5238 | ptr = ensure_contiguous_unsigned(tvb, offset, len);
5239 |
5240 | /*
5241 | * XXX - map illegal digits (digits that map to 0) to REPLACEMENT
5242 | * CHARACTER, and have all the tables in epan/tvbuff.c use 0 rather
5243 | * than '?'?
5244 | */
5245 | digit_str = (char *)wmem_alloc(scope, len*2 + 1);
5246 |
5247 | while (len > 0) {
5248 | octet = *ptr;
5249 | if (!skip_first) {
5250 | if (bigendian) {
5251 | nibble = (octet >> 4) & 0x0f;
5252 | } else {
5253 | nibble = octet & 0x0f;
5254 | }
5255 | if (nibble == 0x0f) {
5256 | /*
5257 | * Stop digit.
5258 | */
5259 | break;
5260 | }
5261 | digit_str[i] = dgt->out[nibble];
5262 | i++;
5263 | }
5264 | skip_first = false0;
5265 |
5266 | /*
5267 | * unpack second value in byte
5268 | */
5269 | if (bigendian) {
5270 | nibble = octet & 0x0f;
5271 | } else {
5272 | nibble = octet >> 4;
5273 | }
5274 |
5275 | if (nibble == 0x0f) {
5276 | /*
5277 | * This is the stop digit or a filler digit. Ignore
5278 | * it.
5279 | */
5280 | break;
5281 | }
5282 | if ((len == 1) && (odd == true1 )){
5283 | /* Last octet, skip last high nibble in case of odd number of digits */
5284 | break;
5285 | }
5286 | digit_str[i] = dgt->out[nibble];
5287 | i++;
5288 |
5289 | ptr++;
5290 | len--;
5291 | }
5292 | digit_str[i] = '\0';
5293 | return digit_str;
5294 | }
5295 |
5296 | /* XXXX Fix me - needs odd indicator added (or just use of tvb_get_bcd_string / proto_tree_add_item) */
5297 | const char *
5298 | tvb_bcd_dig_to_str(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned len, const dgt_set_t *dgt, bool_Bool skip_first)
5299 | {
5300 | if (!dgt)
5301 | dgt = &Dgt0_9_bcd;
5302 |
5303 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, false0);
5304 | }
5305 |
5306 | const char *
5307 | tvb_bcd_dig_to_str_be(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned len, const dgt_set_t *dgt, bool_Bool skip_first)
5308 | {
5309 | if (!dgt)
5310 | dgt = &Dgt0_9_bcd;
5311 |
5312 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, true1);
5313 | }
5314 |
5315 | /*
5316 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
5317 | * to the string with the formatted data.
5318 | */
5319 | char *
5320 | tvb_bytes_to_str(wmem_allocator_t *allocator, tvbuff_t *tvb, const unsigned offset, const unsigned len)
5321 | {
5322 | return bytes_to_str(allocator, ensure_contiguous_unsigned(tvb, offset, len), len)bytes_to_str_maxlen(allocator, ensure_contiguous_unsigned(tvb , offset, len), len, 36);
5323 | }
5324 |
5325 | /* Find a needle tvbuff within a haystack tvbuff. */
5326 | int
5327 | tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const int haystack_offset)
5328 | {
5329 | unsigned haystack_abs_offset = 0, haystack_abs_length = 0;
5330 | const uint8_t *haystack_data;
5331 | const uint8_t *needle_data;
5332 | const unsigned needle_len = needle_tvb->length;
5333 | const uint8_t *location;
5334 |
5335 | 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", 5335, "haystack_tvb && haystack_tvb->initialized" ))));
5336 |
5337 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
5338 | return -1;
5339 | }
5340 |
5341 | /* Get pointers to the tvbuffs' data. */
5342 | haystack_data = ensure_contiguous(haystack_tvb, 0, -1);
5343 | needle_data = ensure_contiguous(needle_tvb, 0, -1);
5344 |
5345 | check_offset_length(haystack_tvb, haystack_offset, -1,
5346 | &haystack_abs_offset, &haystack_abs_length);
5347 |
5348 | location = ws_memmem(haystack_data + haystack_abs_offset, haystack_abs_length,
5349 | needle_data, needle_len);
5350 |
5351 | if (location) {
5352 | return (int) (location - haystack_data);
5353 | }
5354 |
5355 | return -1;
5356 | }
5357 |
5358 | /* Find a needle tvbuff within a haystack tvbuff. */
5359 | bool_Bool
5360 | tvb_find_tvb_remaining(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const unsigned haystack_offset, unsigned *found_offset)
5361 | {
5362 | const uint8_t *haystack_data;
5363 | const uint8_t *needle_data;
5364 | const unsigned needle_len = needle_tvb->length;
5365 | const uint8_t *location;
5366 | int exception;
5367 | unsigned haystack_rem_length;
5368 |
5369 | 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", 5369, "haystack_tvb && haystack_tvb->initialized" ))));
5370 | DISSECTOR_ASSERT(needle_tvb && needle_tvb->initialized)((void) ((needle_tvb && needle_tvb->initialized) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 5370, "needle_tvb && needle_tvb->initialized" ))));
5371 |
5372 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
5373 | return false0;
5374 | }
5375 |
5376 | exception = validate_offset_and_remaining(haystack_tvb, haystack_offset, &haystack_rem_length);
5377 | if (exception)
5378 | THROW(exception)except_throw(1, (exception), ((void*)0));
5379 |
5380 | /* Get pointers to the tvbuffs' data. */
5381 | haystack_data = ensure_contiguous_unsigned(haystack_tvb, haystack_offset, haystack_rem_length);
5382 | needle_data = ensure_contiguous_unsigned(needle_tvb, 0, needle_len);
5383 |
5384 | location = ws_memmem(haystack_data, haystack_rem_length,
5385 | needle_data, needle_len);
5386 |
5387 | if (location) {
5388 | if (found_offset)
5389 | *found_offset = (unsigned) (location - haystack_data) + haystack_offset;
5390 | return true1;
5391 | }
5392 |
5393 | return false0;
5394 | }
5395 |
5396 | unsigned
5397 | tvb_raw_offset(tvbuff_t *tvb)
5398 | {
5399 | if (!(tvb->flags & TVBUFF_RAW_OFFSET0x00000002)) {
5400 | tvb->raw_offset = tvb_offset_from_real_beginning(tvb);
5401 | tvb->flags |= TVBUFF_RAW_OFFSET0x00000002;
5402 | }
5403 | return tvb->raw_offset;
5404 | }
5405 |
5406 | void
5407 | tvb_set_fragment(tvbuff_t *tvb)
5408 | {
5409 | tvb->flags |= TVBUFF_FRAGMENT0x00000001;
5410 | }
5411 |
5412 | struct tvbuff *
5413 | tvb_get_ds_tvb(tvbuff_t *tvb)
5414 | {
5415 | return(tvb->ds_tvb);
5416 | }
5417 |
5418 | unsigned
5419 | tvb_get_varint(tvbuff_t *tvb, unsigned offset, unsigned maxlen, uint64_t *value, const unsigned encoding)
5420 | {
5421 | *value = 0;
5422 |
5423 | switch (encoding & ENC_VARINT_MASK(0x00000002|0x00000004|0x00000008|0x00000010)) {
5424 | case ENC_VARINT_PROTOBUF0x00000002:
5425 | {
5426 | unsigned i;
5427 | uint64_t b; /* current byte */
5428 |
5429 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5430 | b = tvb_get_uint8(tvb, offset++);
5431 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
5432 |
5433 | if (b < 0x80) {
5434 | /* end successfully because of last byte's msb(most significant bit) is zero */
5435 | return i + 1;
5436 | }
5437 | }
5438 | break;
5439 | }
5440 |
5441 | case ENC_VARINT_ZIGZAG0x00000008:
5442 | {
5443 | unsigned i;
5444 | uint64_t b; /* current byte */
5445 |
5446 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5447 | b = tvb_get_uint8(tvb, offset++);
5448 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
5449 |
5450 | if (b < 0x80) {
5451 | /* end successfully because of last byte's msb(most significant bit) is zero */
5452 | *value = (*value >> 1) ^ ((*value & 1) ? -1 : 0);
5453 | return i + 1;
5454 | }
5455 | }
5456 | break;
5457 | }
5458 |
5459 | case ENC_VARINT_SDNV0x00000010:
5460 | {
5461 | /* Decodes similar to protobuf but in MSByte order */
5462 | unsigned i;
5463 | uint64_t b; /* current byte */
5464 |
5465 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5466 | b = tvb_get_uint8(tvb, offset++);
5467 | if ((i == 9) && (*value >= UINT64_C(1)1UL<<(64-7))) {
5468 | // guaranteed overflow, not valid SDNV
5469 | return 0;
5470 | }
5471 | *value <<= 7;
5472 | *value |= (b & 0x7F); /* add lower 7 bits to val */
5473 |
5474 | if (b < 0x80) {
5475 | /* end successfully because of last byte's msb(most significant bit) is zero */
5476 | return i + 1;
5477 | }
5478 | }
5479 | break;
5480 | }
5481 |
5482 | case ENC_VARINT_QUIC0x00000004:
5483 | {
5484 | /* calculate variable length */
5485 | *value = tvb_get_uint8(tvb, offset);
5486 | switch((*value) >> 6) {
5487 | case 0: /* 0b00 => 1 byte length (6 bits Usable) */
5488 | (*value) &= 0x3F;
5489 | return 1;
5490 | case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
5491 | *value = tvb_get_ntohs(tvb, offset) & 0x3FFF;
5492 | return 2;
5493 | case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
5494 | *value = tvb_get_ntohl(tvb, offset) & 0x3FFFFFFF;
5495 | return 4;
5496 | case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
5497 | *value = tvb_get_ntoh64(tvb, offset) & UINT64_C(0x3FFFFFFFFFFFFFFF)0x3FFFFFFFFFFFFFFFUL;
5498 | return 8;
5499 | default: /* No Possible */
5500 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 5500, __func__, "assertion \"not reached\" failed");
5501 | break;
5502 | }
5503 | break;
5504 | }
5505 |
5506 | default:
5507 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 5507));
5508 | }
5509 |
5510 | return 0; /* 10 bytes scanned, but no bytes' msb is zero */
5511 | }
5512 |
5513 | /*
5514 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
5515 | *
5516 | * Local variables:
5517 | * c-basic-offset: 8
5518 | * tab-width: 8
5519 | * indent-tabs-mode: t
5520 | * End:
5521 | *
5522 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
5523 | * :indentSize=8:tabSize=8:noTabs=false:
5524 | */