### Bug Summary

File: | builds/wireshark/wireshark/epan/tvbuff.c
Warning: | line 520, 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/2026-04-23-100342-3640-1 -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 | /* coverity[ +taint_sanitize : arg-1 ] */
62 | /* coverity[ +taint_sanitize : arg-2 ] */
63 | static inline const uint8_t*
64 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length);
65 |
66 | static inline uint8_t *
67 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length);
68 |
69 | tvbuff_t *
70 | tvb_new(const struct tvb_ops *ops)
71 | {
72 | tvbuff_t *tvb;
73 | size_t size = ops->tvb_size;
74 |
75 | ws_assert(size >= sizeof(*tvb))do { if ((1) && !(size >= sizeof(*tvb))) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 75, __func__, "assertion failed: %s" , "size >= sizeof(*tvb)"); } while (0);
76 |
77 | tvb = (tvbuff_t *) g_slice_alloc(size);
78 |
79 | tvb->next = NULL((void*)0);
80 | tvb->ops = ops;
81 | tvb->initialized = false0;
82 | tvb->flags = 0;
83 | tvb->length = 0;
84 | tvb->reported_length = 0;
85 | tvb->contained_length = 0;
86 | tvb->real_data = NULL((void*)0);
87 | tvb->raw_offset = 0;
88 | tvb->ds_tvb = NULL((void*)0);
89 |
90 | return tvb;
91 | }
92 |
93 | static void
94 | tvb_free_internal(tvbuff_t *tvb)
95 | {
96 | size_t size;
97 |
98 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 98, "tvb"))));
99 |
100 | if (tvb->ops->tvb_free)
101 | tvb->ops->tvb_free(tvb);
102 |
103 | size = tvb->ops->tvb_size;
104 |
105 | g_slice_free1(size, tvb);
106 | }
107 |
108 | /* XXX: just call tvb_free_chain();
109 | * Not removed so that existing dissectors using tvb_free() need not be changed.
110 | * I'd argue that existing calls to tvb_free() should have actually been
111 | * calls to tvb_free_chain() although the calls were OK as long as no
112 | * subsets, etc had been created on the tvb. */
113 | void
114 | tvb_free(tvbuff_t *tvb)
115 | {
116 | tvb_free_chain(tvb);
117 | }
118 |
119 | void
120 | tvb_free_chain(tvbuff_t *tvb)
121 | {
122 | tvbuff_t *next_tvb;
123 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 123, "tvb"))));
124 | while (tvb) {
125 | next_tvb = tvb->next;
126 | tvb_free_internal(tvb);
127 | tvb = next_tvb;
128 | }
129 | }
130 |
131 | tvbuff_t *
132 | tvb_new_chain(tvbuff_t *parent, tvbuff_t *backing)
133 | {
134 | tvbuff_t *tvb = tvb_new_proxy(backing);
135 |
136 | tvb_add_to_chain(parent, tvb);
137 | return tvb;
138 | }
139 |
140 | void
141 | tvb_add_to_chain(tvbuff_t *parent, tvbuff_t *child)
142 | {
143 | tvbuff_t *tmp;
144 |
145 | DISSECTOR_ASSERT(parent)((void) ((parent) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 145, "parent"))));
146 | DISSECTOR_ASSERT(child)((void) ((child) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 146, "child"))));
147 |
148 | while (child) {
149 | tmp = child;
150 | child = child->next;
151 |
152 | tmp->next = parent->next;
153 | parent->next = tmp;
154 | }
155 | }
156 |
157 | /*
158 | * Check whether that offset goes more than one byte past the
159 | * end of the buffer.
160 | *
161 | * If not, return 0; otherwise, return exception
162 | */
163 | static inline int
164 | validate_offset(const tvbuff_t *tvb, const unsigned abs_offset)
165 | {
166 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
167 | /* It's OK. */
168 | return 0;
169 | }
170 |
171 | /*
172 | * It's not OK, but why? Which boundaries is it
173 | * past?
174 | */
175 | if (abs_offset <= tvb->contained_length) {
176 | /*
177 | * It's past the captured length, but not past
178 | * the reported end of any parent tvbuffs from
179 | * which this is constructed, or the reported
180 | * end of this tvbuff, so it's out of bounds
181 | * solely because we're past the end of the
182 | * captured data.
183 | */
184 | return BoundsError1;
185 | }
186 |
187 | /*
188 | * There's some actual packet boundary, not just the
189 | * artificial boundary imposed by packet slicing, that
190 | * we're past.
191 | */
192 |
193 | if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
194 | /*
195 | * This tvbuff is the first fragment of a larger
196 | * packet that hasn't been reassembled, so we
197 | * assume that's the source of the problem - if
198 | * we'd reassembled the packet, we wouldn't have
199 | * gone past the end.
200 | *
201 | * That might not be true, but for at least
202 | * some forms of reassembly, such as IP
203 | * reassembly, you don't know how big the
204 | * reassembled packet is unless you reassemble
205 | * it, so, in those cases, we can't determine
206 | * whether we would have gone past the end
207 | * had we reassembled the packet.
208 | */
209 | return FragmentBoundsError4;
210 | }
211 |
212 | /* OK, we're not an unreassembled fragment (that we know of). */
213 | if (abs_offset <= tvb->reported_length) {
214 | /*
215 | * We're within the bounds of what this tvbuff
216 | * purportedly contains, based on some length
217 | * value, but we're not within the bounds of
218 | * something from which this tvbuff was
219 | * extracted, so that length value ran past
220 | * the end of some parent tvbuff.
221 | */
222 | return ContainedBoundsError2;
223 | }
224 |
225 | /*
226 | * OK, it looks as if we ran past the claimed length
227 | * of data.
228 | */
229 | return ReportedBoundsError3;
230 | }
231 |
232 | static inline int
233 | validate_offset_and_remaining(const tvbuff_t *tvb, const unsigned offset, unsigned *rem_len)
234 | {
235 | int exception;
236 |
237 | exception = validate_offset(tvb, offset);
238 | if (!exception)
239 | *rem_len = tvb->length - offset;
240 |
241 | return exception;
242 | }
243 |
244 | /* Returns integer indicating whether the given offset and the end offset
245 | * calculated from that offset and the given length are in bounds (0) or
246 | * not (exception number).
247 | * No exception is thrown; on success, we return 0, otherwise we return an
248 | * exception for the caller to throw if appropriate.
249 | *
250 | * N.B. - we return success (0), if the offset is positive and right
251 | * after the end of the tvbuff (i.e., equal to the length). We do this
252 | * so that a dissector constructing a subset tvbuff for the next protocol
253 | * will get a zero-length tvbuff, not an exception, if there's no data
254 | * left for the next protocol - we want the next protocol to be the one
255 | * that gets an exception, so the error is reported as an error in that
256 | * protocol rather than the containing protocol. */
257 | static inline int
258 | validate_offset_length_no_exception(const tvbuff_t *tvb,
259 | const unsigned offset, const unsigned length)
260 | {
261 | unsigned end_offset;
262 | int exception;
263 |
264 | /* Compute the offset */
265 | /* Since offset is unsigned, the only effect of validation is to throw
266 | * a possibly different exception if offset is outside the captured
267 | * bytes. E.g., offset could be outside the captured bytes but in the
268 | * reported length, but end_offset outside the reported length.
269 | * XXX - Which *is* the proper exception? Compare fast_ensure_contiguous
270 | * which only throws the exception related to the end offset.
271 | */
272 | exception = validate_offset(tvb, offset);
273 | if (exception)
274 | return exception;
275 |
276 | /*
277 | * Compute the offset of the first byte past the length,
278 | * checking for an overflow.
279 | */
280 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
281 | return BoundsError1;
282 |
283 | return validate_offset(tvb, end_offset);
284 | }
285 |
286 | /* Checks offset and length and throws an exception if
287 | * either is out of bounds. Sets integer ptrs to the new length. */
288 | static inline void
289 | validate_offset_length(const tvbuff_t *tvb,
290 | const unsigned offset, const unsigned length)
291 | {
292 | int exception;
293 |
294 | exception = validate_offset_length_no_exception(tvb, offset, length);
295 | if (exception)
296 | THROW(exception)except_throw(1, (exception), ((void*)0));
297 | }
298 |
299 | /* Internal function so that other translation units can use
300 | * validate_offset_length. */
301 | void
302 | tvb_validate_offset_length(const tvbuff_t *tvb,
303 | const unsigned offset, const unsigned length)
304 | {
305 | validate_offset_length(tvb, offset, length);
306 | }
307 |
308 | /* Internal function so that other translation units can use
309 | * validate_offset_and_remaining. This throws the exception
310 | * from validate_offset_and_remaining. */
311 | void
312 | tvb_validate_offset_and_remaining(const tvbuff_t *tvb,
313 | const unsigned offset, unsigned *rem_len)
314 | {
315 | int exception;
316 |
317 | exception = validate_offset_and_remaining(tvb, offset, rem_len);
318 | if (exception)
319 | THROW(exception)except_throw(1, (exception), ((void*)0));
320 | }
321 |
322 | /*
323 | * The same as validate_offset except this accepts negative offsets, meaning
324 | * relative to the end of (captured) length. (That it's captured, not reported,
325 | * length is one reason to deprecate signed offsets, #20103.)
326 | */
327 | static inline int
328 | compute_offset(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr)
329 | {
330 | if (offset >= 0) {
331 | /* Positive offset - relative to the beginning of the packet. */
332 | if (G_LIKELY((unsigned) offset <= tvb->length)((unsigned) offset <= tvb->length)) {
333 | *offset_ptr = offset;
334 | } else if ((unsigned) offset <= tvb->contained_length) {
335 | return BoundsError1;
336 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
337 | return FragmentBoundsError4;
338 | } else if ((unsigned) offset <= tvb->reported_length) {
339 | return ContainedBoundsError2;
340 | } else {
341 | return ReportedBoundsError3;
342 | }
343 | }
344 | else {
345 | /* Negative offset - relative to the end of the packet. */
346 | /* Prevent UB on 2's complement platforms. All tested compilers
347 | * (gcc, clang, MSVC) compile this to a single instruction on
348 | * x86, ARM, RISC-V, S390x, SPARC, etc. at -O1 and higher
349 | * according to godbolt.org. */
350 | unsigned abs_offset = ((unsigned)-(offset + 1)) + 1;
351 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
352 | *offset_ptr = tvb->length - abs_offset;
353 | } else if (abs_offset <= tvb->contained_length) {
354 | return BoundsError1;
355 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
356 | return FragmentBoundsError4;
357 | } else if (abs_offset <= tvb->reported_length) {
358 | return ContainedBoundsError2;
359 | } else {
360 | return ReportedBoundsError3;
361 | }
362 | }
363 |
364 | return 0;
365 | }
366 |
367 | /* Computes the absolute offset and length based on a possibly-negative offset
368 | * and a length that is possible -1 (which means "to the end of the data").
369 | * Returns integer indicating whether the offset is in bounds (0) or
370 | * not (exception number). The integer ptrs are modified with the new offset,
371 | * captured (available) length, and contained length (amount that's present
372 | * in the parent tvbuff based on its reported length).
373 | * No exception is thrown; on success, we return 0, otherwise we return an
374 | * exception for the caller to throw if appropriate.
375 | *
376 | * XXX - we return success (0), if the offset is positive and right
377 | * after the end of the tvbuff (i.e., equal to the length). We do this
378 | * so that a dissector constructing a subset tvbuff for the next protocol
379 | * will get a zero-length tvbuff, not an exception, if there's no data
380 | * left for the next protocol - we want the next protocol to be the one
381 | * that gets an exception, so the error is reported as an error in that
382 | * protocol rather than the containing protocol. */
383 | static inline int
384 | check_offset_length_no_exception(const tvbuff_t *tvb,
385 | const int offset, int const length_val,
386 | unsigned *offset_ptr, unsigned *length_ptr)
387 | {
388 | unsigned end_offset;
389 | int exception;
390 |
391 | DISSECTOR_ASSERT(offset_ptr)((void) ((offset_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 391, "offset_ptr" ))));
392 | DISSECTOR_ASSERT(length_ptr)((void) ((length_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 392, "length_ptr" ))));
393 |
394 | /* Compute the offset */
395 | exception = compute_offset(tvb, offset, offset_ptr);
396 | if (exception)
397 | return exception;
398 |
399 | if (length_val < -1) {
400 | /* XXX - ReportedBoundsError? */
401 | return BoundsError1;
402 | }
403 |
404 | /* Compute the length */
405 | if (length_val == -1)
406 | *length_ptr = tvb->length - *offset_ptr;
407 | else
408 | *length_ptr = length_val;
409 |
410 | /*
411 | * Compute the offset of the first byte past the length.
412 | */
413 | end_offset = *offset_ptr + *length_ptr;
414 |
415 | /*
416 | * Check for an overflow
417 | */
418 | if (end_offset < *offset_ptr)
419 | return BoundsError1;
420 |
421 | return validate_offset(tvb, end_offset);
422 | }
423 |
424 | /* Checks (+/-) offset and length and throws an exception if
425 | * either is out of bounds. Sets integer ptrs to the new offset
426 | * and length. */
427 | static inline void
428 | check_offset_length(const tvbuff_t *tvb,
429 | const int offset, int const length_val,
430 | unsigned *offset_ptr, unsigned *length_ptr)
431 | {
432 | int exception;
433 |
434 | exception = check_offset_length_no_exception(tvb, offset, length_val, offset_ptr, length_ptr);
435 | if (exception)
436 | THROW(exception)except_throw(1, (exception), ((void*)0));
437 | }
438 |
439 | /* Internal function so that other translation units can use
440 | * check_offset_length. */
441 | void
442 | tvb_check_offset_length(const tvbuff_t *tvb,
443 | const int offset, int const length_val,
444 | unsigned *offset_ptr, unsigned *length_ptr)
445 | {
446 | check_offset_length(tvb, offset, length_val, offset_ptr, length_ptr);
447 | }
448 |
449 | static const unsigned char left_aligned_bitmask[] = {
450 | 0xff,
451 | 0x80,
452 | 0xc0,
453 | 0xe0,
454 | 0xf0,
455 | 0xf8,
456 | 0xfc,
457 | 0xfe
458 | };
459 |
460 | /* tvb_new_octet_aligned used to support -1 no_of_bits as meaning "to the
461 | * end of the buffer." Nothing every used it. It could be supported with
462 | * a _remaining() function if necessary. Note that the previous implementation
463 | * didn't properly keep the extra reported length if the reported length
464 | * was greater than the captured length.
465 | */
466 |
467 | tvbuff_t *
468 | tvb_new_octet_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
469 | {
470 | tvbuff_t *sub_tvb = NULL((void*)0);
471 | uint32_t byte_offset;
472 | uint32_t datalen, i;
473 | uint8_t left, right, remaining_bits, *buf;
474 | const uint8_t *data;
475 |
476 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 476, "tvb && tvb->initialized" ))));
4 | ← | Assuming 'tvb' is non-null | →
5 | ← | Assuming field 'initialized' is true | →
6 | ← | '?' condition is true | →
477 |
478 | byte_offset = bit_offset >> 3;
479 | left = bit_offset % 8; /* for left-shifting */
480 | right = 8 - left; /* for right-shifting */
481 |
482 | datalen = no_of_bits >> 3;
483 | remaining_bits = no_of_bits % 8;
484 | if (remaining_bits) {
7 | ← | Assuming 'remaining_bits' is 0 | →
485 | datalen++;
486 | }
487 |
488 | /* already aligned -> shortcut */
489 | if (((left == 0) && (remaining_bits == 0)) || datalen == 0) {
8 | ← | Assuming 'left' is not equal to 0 | →
9 | ← | Assuming 'datalen' is not equal to 0 | →
10 | ← | Taking false branch | →
490 | return tvb_new_subset_length_caplen(tvb, byte_offset, datalen, datalen);
491 | }
492 |
493 | /* If at least one trailing byte is available, we must use the content
494 | * of that byte for the last shift (i.e. tvb_get_ptr() must use datalen + 1).
495 | * If no extra byte is available, the last shifted byte requires
496 | * special treatment.
497 | */
498 | if (_tvb_captured_length_remaining(tvb, byte_offset) > datalen) {
11 | ← | Assuming the condition is true | →
12 | ← | Taking true branch | →
499 | data = ensure_contiguous_unsigned(tvb, byte_offset, datalen + 1); /* tvb_get_ptr */
500 |
501 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
502 | buf = (uint8_t *)g_malloc(datalen);
13 | ← | Memory is allocated | →
503 |
504 | /* shift tvb data bit_offset bits to the left */
505 | for (i = 0; i
13.1 | 'i' is < 'datalen'
< datalen; i++)
14 | ← | Loop condition is true. Entering loop body | →
16 | ← | Assuming 'i' is >= 'datalen' | →
17 | ← | Loop condition is false. Execution continues on line 518 | →
506 | buf[i] = (data[i] << left) | (data[i+1] >> right);
15 | ← | Assuming right operand of bit shift is non-negative but less than 32 | →
507 | } else {
508 | data = ensure_contiguous_unsigned(tvb, byte_offset, datalen); /* tvb_get_ptr() */
509 |
510 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
511 | buf = (uint8_t *)g_malloc(datalen);
512 |
513 | /* shift tvb data bit_offset bits to the left */
514 | for (i = 0; i < (datalen-1); i++)
515 | buf[i] = (data[i] << left) | (data[i+1] >> right);
516 | buf[datalen-1] = data[datalen-1] << left; /* set last octet */
517 | }
518 | buf[datalen-1] &= left_aligned_bitmask[remaining_bits];
519 |
520 | sub_tvb = tvb_new_child_real_data(tvb, buf, datalen, datalen);
18 | ← | Potential leak of memory pointed to by 'buf'
521 | tvb_set_free_cb(sub_tvb, g_free);
522 |
523 | return sub_tvb;
524 | }
525 |
526 | tvbuff_t *
527 | tvb_new_octet_right_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
528 | {
529 | tvbuff_t *sub_tvb = NULL((void*)0);
530 | uint32_t byte_offset;
531 | unsigned src_len, dst_len, i;
532 | uint8_t left, right, remaining_bits, *buf;
533 | const uint8_t *data;
534 |
535 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 535, "tvb && tvb->initialized" ))));
536 |
537 | byte_offset = bit_offset / 8;
538 | /* right shift to put bits in place and discard least significant bits */
539 | right = bit_offset % 8;
540 | /* left shift to get most significant bits from next octet */
541 | left = 8 - right;
542 |
543 | dst_len = no_of_bits / 8;
544 | remaining_bits = no_of_bits % 8;
545 | if (remaining_bits) {
546 | dst_len++;
547 | }
548 |
549 | /* already aligned -> shortcut */
550 | if (((right == 0) && (remaining_bits == 0)) || dst_len == 0) {
551 | return tvb_new_subset_length_caplen(tvb, byte_offset, dst_len, dst_len);
552 | }
553 |
554 | if (_tvb_captured_length_remaining(tvb, byte_offset) > dst_len) {
555 | /* last octet will get data from trailing octet */
556 | src_len = dst_len + 1;
557 | } else {
558 | /* last octet will be zero padded */
559 | src_len = dst_len;
560 | }
561 |
562 | data = ensure_contiguous_unsigned(tvb, byte_offset, src_len); /* tvb_get_ptr */
563 |
564 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
565 | buf = (uint8_t *)g_malloc(dst_len);
566 |
567 | for (i = 0; i < (dst_len - 1); i++)
568 | buf[i] = (data[i] >> right) | (data[i+1] << left);
569 |
570 | /* Special handling for last octet */
571 | buf[i] = (data[i] >> right);
572 | /* Shift most significant bits from trailing octet if available */
573 | if (src_len > dst_len)
574 | buf[i] |= (data[i+1] << left);
575 | /* Preserve only remaining bits in last octet if not multiple of 8 */
576 | if (remaining_bits)
577 | buf[i] &= ((1 << remaining_bits) - 1);
578 |
579 | sub_tvb = tvb_new_child_real_data(tvb, buf, dst_len, dst_len);
580 | tvb_set_free_cb(sub_tvb, g_free);
581 |
582 | return sub_tvb;
583 | }
584 |
585 | static tvbuff_t *
586 | tvb_generic_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
587 | {
588 | tvbuff_t *cloned_tvb;
589 | uint8_t *data;
590 |
591 | 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", 591, "tvb_bytes_exist(tvb, offset, len)" ))));
592 |
593 | data = (uint8_t *) g_malloc(len);
594 |
595 | tvb_memcpy(tvb, data, offset, len);
596 |
597 | cloned_tvb = tvb_new_real_data(data, len, len);
598 | tvb_set_free_cb(cloned_tvb, g_free);
599 |
600 | return cloned_tvb;
601 | }
602 |
603 | tvbuff_t *
604 | tvb_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
605 | {
606 | if (tvb->ops->tvb_clone) {
607 | tvbuff_t *cloned_tvb;
608 |
609 | cloned_tvb = tvb->ops->tvb_clone(tvb, offset, len);
610 | if (cloned_tvb)
611 | return cloned_tvb;
612 | }
613 |
614 | return tvb_generic_clone_offset_len(tvb, offset, len);
615 | }
616 |
617 | tvbuff_t *
618 | tvb_clone(tvbuff_t *tvb)
619 | {
620 | return tvb_clone_offset_len(tvb, 0, tvb->length);
621 | }
622 |
623 | inline unsigned
624 | tvb_captured_length(const tvbuff_t *tvb)
625 | {
626 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 626, "tvb && tvb->initialized" ))));
627 |
628 | return tvb->length;
629 | }
630 |
631 | /* For tvbuff internal use */
632 | static inline unsigned
633 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
634 | {
635 | unsigned rem_length;
636 | int exception;
637 |
638 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
639 | if (exception)
640 | return 0;
641 |
642 | return rem_length;
643 | }
644 |
645 | unsigned
646 | tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
647 | {
648 | unsigned rem_length;
649 | int exception;
650 |
651 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 651, "tvb && tvb->initialized" ))));
652 |
653 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
654 | if (exception)
655 | return 0;
656 |
657 | return rem_length;
658 | }
659 |
660 | unsigned
661 | tvb_ensure_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
662 | {
663 | unsigned rem_length = 0;
664 | int exception;
665 |
666 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 666, "tvb && tvb->initialized" ))));
667 |
668 | exception = validate_offset(tvb, offset);
669 | if (exception)
670 | THROW(exception)except_throw(1, (exception), ((void*)0));
671 |
672 | rem_length = tvb->length - offset;
673 |
674 | if (rem_length == 0) {
675 | /*
676 | * This routine ensures there's at least one byte available.
677 | * There aren't any bytes available, so throw the appropriate
678 | * exception.
679 | */
680 | if (offset < tvb->contained_length) {
681 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
682 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
683 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
684 | } else if (offset < tvb->reported_length) {
685 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
686 | } else {
687 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
688 | }
689 | }
690 | return rem_length;
691 | }
692 |
693 | /* Validates that 'length' bytes are available starting from
694 | * offset. Does not throw an exception. */
695 | bool_Bool
696 | tvb_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
697 | {
698 | unsigned end_offset;
699 |
700 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 700, "tvb && tvb->initialized" ))));
701 |
702 | /*
703 | * Negative lengths are not possible and indicate a bug (e.g. arithmetic
704 | * error or an overly large value from packet data).
705 | */
706 | if (length < 0)
707 | return false0;
708 |
709 | /*
710 | * Compute the offset of the first byte past the length.
711 | * Make sure it doesn't overflow.
712 | */
713 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
714 | return false0;
715 |
716 | /*
717 | * Check that bytes exist up to right before that offset. (As length is
718 | * positive and there was no overflow we don't need to check offset.)
719 | */
720 | if (end_offset > tvb->length)
721 | return false0;
722 |
723 | return true1;
724 | }
725 |
726 | /* Validates that 'length' bytes, where 'length' is a 64-bit unsigned
727 | * integer, are available starting from offset (pos/neg). Throws an
728 | * exception if they aren't. */
729 | /* coverity[ +taint_sanitize : arg-1 ] */
730 | /* coverity[ +taint_sanitize : arg-2 ] */
731 | void
732 | tvb_ensure_bytes_exist64(const tvbuff_t *tvb, const unsigned offset, const uint64_t length)
733 | {
734 | /*
735 | * Make sure the value fits in a signed integer; if not, assume
736 | * that means that it's too big.
737 | */
738 | if (length > INT_MAX2147483647) {
739 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
740 | }
741 |
742 | /* OK, now cast it and try it with tvb_ensure_bytes_exist(). */
743 | tvb_ensure_bytes_exist(tvb, offset, (int)length);
744 | }
745 |
746 | /* Validates that 'length' bytes are available starting from
747 | * offset (pos/neg). Throws an exception if they aren't. */
748 | /* coverity[ +taint_sanitize : arg-1 ] */
749 | /* coverity[ +taint_sanitize : arg-2 ] */
750 | void
751 | tvb_ensure_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
752 | {
753 | unsigned end_offset;
754 | int exception;
755 |
756 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 756, "tvb && tvb->initialized" ))));
757 |
758 | /*
759 | * -1 doesn't mean "until end of buffer", as that's pointless
760 | * for this routine. We must treat it as a Really Large Positive
761 | * Number, so that we throw an exception; we throw
762 | * ReportedBoundsError, as if it were past even the end of a
763 | * reassembled packet, and past the end of even the data we
764 | * didn't capture.
765 | *
766 | * We do the same with other negative lengths.
767 | */
768 | if (length < 0) {
769 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
770 | }
771 |
772 | exception = validate_offset(tvb, offset);
773 | if (exception)
774 | THROW(exception)except_throw(1, (exception), ((void*)0));
775 |
776 | /*
777 | * Compute the offset of the first byte past the length.
778 | */
779 | end_offset = offset + length;
780 |
781 | /*
782 | * Check for an overflow
783 | */
784 | if (end_offset < offset)
785 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
786 |
787 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length))
788 | return;
789 | else if (end_offset <= tvb->contained_length)
790 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
791 | else if (tvb->flags & TVBUFF_FRAGMENT0x00000001)
792 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
793 | else if (end_offset <= tvb->reported_length)
794 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
795 | else
796 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
797 | }
798 |
799 | bool_Bool
800 | tvb_offset_exists(const tvbuff_t *tvb, const unsigned offset)
801 | {
802 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 802, "tvb && tvb->initialized" ))));
803 |
804 | /* We don't care why the offset doesn't exist, and unlike some
805 | * other functions we don't accept an offset one past the end,
806 | * so we check ourselves... */
807 | return offset < tvb->length;
808 | }
809 |
810 | unsigned
811 | tvb_reported_length(const tvbuff_t *tvb)
812 | {
813 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 813, "tvb && tvb->initialized" ))));
814 |
815 | return tvb->reported_length;
816 | }
817 |
818 | unsigned
819 | tvb_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
820 | {
821 | int exception;
822 |
823 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 823, "tvb && tvb->initialized" ))));
824 |
825 | exception = validate_offset(tvb, offset);
826 | if (exception)
827 | return 0;
828 |
829 | if (tvb->reported_length >= offset)
830 | return tvb->reported_length - offset;
831 | else
832 | return 0;
833 | }
834 |
835 | unsigned
836 | tvb_ensure_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
837 | {
838 | int exception;
839 |
840 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 840, "tvb && tvb->initialized" ))));
841 |
842 | exception = validate_offset(tvb, offset);
843 | if (exception)
844 | THROW(exception)except_throw(1, (exception), ((void*)0));
845 |
846 | if (tvb->reported_length >= offset)
847 | return tvb->reported_length - offset;
848 | else
849 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
850 | }
851 |
852 | /* Set the reported length of a tvbuff to a given value; used for protocols
853 | * whose headers contain an explicit length and where the calling
854 | * dissector's payload may include padding as well as the packet for
855 | * this protocol.
856 | * Also adjusts the available and contained length. */
857 | void
858 | tvb_set_reported_length(tvbuff_t *tvb, const unsigned reported_length)
859 | {
860 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 860, "tvb && tvb->initialized" ))));
861 |
862 | if (reported_length > tvb->reported_length)
863 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
864 |
865 | tvb->reported_length = reported_length;
866 | if (reported_length < tvb->length)
867 | tvb->length = reported_length;
868 | if (reported_length < tvb->contained_length)
869 | tvb->contained_length = reported_length;
870 | }
871 |
872 | /* Repair a tvbuff where the captured length is greater than the
873 | * reported length; such a tvbuff makes no sense, as it's impossible
874 | * to capture more data than is in the packet.
875 | */
876 | void
877 | tvb_fix_reported_length(tvbuff_t *tvb)
878 | {
879 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 879, "tvb && tvb->initialized" ))));
880 | 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", 880, "tvb->reported_length < tvb->length" ))));
881 |
882 | tvb->reported_length = tvb->length;
883 | if (tvb->contained_length < tvb->length)
884 | tvb->contained_length = tvb->length;
885 | }
886 |
887 | unsigned
888 | tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const unsigned counter)
889 | {
890 | if (tvb->ops->tvb_offset)
891 | return tvb->ops->tvb_offset(tvb, counter);
892 |
893 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 893));
894 | return 0;
895 | }
896 |
897 | unsigned
898 | tvb_offset_from_real_beginning(const tvbuff_t *tvb)
899 | {
900 | return tvb_offset_from_real_beginning_counter(tvb, 0);
901 | }
902 |
903 | static inline const uint8_t*
904 | ensure_contiguous_unsigned_no_exception(tvbuff_t *tvb, const unsigned offset, const unsigned length, int *pexception)
905 | {
906 | int exception;
907 |
908 | exception = validate_offset_length_no_exception(tvb, offset, length);
909 | if (exception) {
910 | if (pexception)
911 | *pexception = exception;
912 | return NULL((void*)0);
913 | }
914 |
915 | /*
916 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
917 | * then it is acceptable to have an empty tvb (!tvb->real_data).
918 | */
919 | if (length == 0) {
920 | return NULL((void*)0);
921 | }
922 |
923 | /*
924 | * We know that all the data is present in the tvbuff, so
925 | * no exceptions should be thrown.
926 | */
927 | if (tvb->real_data)
928 | return tvb->real_data + offset;
929 |
930 | if (tvb->ops->tvb_get_ptr)
931 | return tvb->ops->tvb_get_ptr(tvb, offset, length);
932 |
933 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 933));
934 | return NULL((void*)0);
935 | }
936 |
937 | static inline const uint8_t*
938 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length)
939 | {
940 | int exception = 0;
941 | const uint8_t *p;
942 |
943 | p = ensure_contiguous_unsigned_no_exception(tvb, offset, length, &exception);
944 | if (p == NULL((void*)0) && length != 0) {
945 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 945, "exception > 0" ))));
946 | THROW(exception)except_throw(1, (exception), ((void*)0));
947 | }
948 | return p;
949 | }
950 |
951 | static inline const uint8_t*
952 | ensure_contiguous_no_exception(tvbuff_t *tvb, const int offset, const int length, int *pexception)
953 | {
954 | unsigned abs_offset = 0, abs_length = 0;
955 | int exception;
956 |
957 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length);
958 | if (exception) {
959 | if (pexception)
960 | *pexception = exception;
961 | return NULL((void*)0);
962 | }
963 |
964 | /*
965 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
966 | * then it is acceptable to have an empty tvb (!tvb->real_data).
967 | */
968 | if (length == 0) {
969 | return NULL((void*)0);
970 | }
971 |
972 | /*
973 | * We know that all the data is present in the tvbuff, so
974 | * no exceptions should be thrown.
975 | */
976 | if (tvb->real_data)
977 | return tvb->real_data + abs_offset;
978 |
979 | if (tvb->ops->tvb_get_ptr)
980 | return tvb->ops->tvb_get_ptr(tvb, abs_offset, abs_length);
981 |
982 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 982));
983 | return NULL((void*)0);
984 | }
985 |
986 | static inline const uint8_t*
987 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length)
988 | {
989 | int exception = 0;
990 | const uint8_t *p;
991 |
992 | p = ensure_contiguous_no_exception(tvb, offset, length, &exception);
993 | if (p == NULL((void*)0) && length != 0) {
994 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 994, "exception > 0" ))));
995 | THROW(exception)except_throw(1, (exception), ((void*)0));
996 | }
997 | return p;
998 | }
999 |
1000 | static inline const uint8_t*
1001 | fast_ensure_contiguous(tvbuff_t *tvb, const unsigned offset, const unsigned length)
1002 | {
1003 | unsigned end_offset;
1004 |
1005 | /* Since offset is unsigned, we have to check for overflow. */
1006 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1006, "tvb && tvb->initialized" ))));
1007 |
1008 | /* This is only called internally, never with zero. Try to satisfy
1009 | * Coverity that we don't run off the end. */
1010 | ws_assert(length != 0)do { if ((1) && !(length != 0)) ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 1010, __func__, "assertion failed: %s" , "length != 0"); } while (0);
1011 |
1012 | if (!tvb->real_data) {
1013 | return ensure_contiguous_unsigned(tvb, offset, length);
1014 | }
1015 |
1016 | /* XXX - Is this really faster now (other than the slight difference
1017 | * in behavior from only throwing the exception related to the end
1018 | * offset?) */
1019 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
1020 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1021 |
1022 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) {
1023 | return tvb->real_data + offset;
1024 | } else if (end_offset <= tvb->contained_length) {
1025 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1026 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
1027 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
1028 | } else if (end_offset <= tvb->reported_length) {
1029 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
1030 | } else {
1031 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
1032 | }
1033 | /* not reached */
1034 | return NULL((void*)0);
1035 | }
1036 |
1037 |
1038 |
1039 | /************** ACCESSORS **************/
1040 |
1041 | void *
1042 | tvb_memcpy(tvbuff_t *tvb, void *target, const unsigned offset, size_t length)
1043 | {
1044 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1044, "tvb && tvb->initialized" ))));
1045 |
1046 | /*
1047 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1048 | * only supports an unsigned.
1049 | */
1050 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1050, "length <= (2147483647 *2U +1U)" ))));
1051 | validate_offset_length(tvb, offset, (unsigned)length);
1052 |
1053 | if (target && tvb->real_data) {
1054 | return memcpy(target, tvb->real_data + offset, length);
1055 | }
1056 |
1057 | if (target && tvb->ops->tvb_memcpy)
1058 | return tvb->ops->tvb_memcpy(tvb, target, offset, (unsigned)length);
1059 |
1060 | /*
1061 | * If the length is 0, there's nothing to do.
1062 | * (tvb->real_data could be null if it's allocated with
1063 | * a size of length.)
1064 | */
1065 | if (length != 0) {
1066 | /*
1067 | * XXX, fallback to slower method
1068 | */
1069 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 1069));
1070 | }
1071 | return NULL((void*)0);
1072 | }
1073 |
1074 |
1075 | /*
1076 | * XXX - This could replace some code that calls "tvb_ensure_bytes_exist()"
1077 | * and then allocates a buffer and copies data to it.
1078 | *
1079 | * If scope is NULL, memory is allocated with g_malloc() and user must
1080 | * explicitly free it with g_free().
1081 | * If scope is not NULL, memory is allocated with the corresponding pool
1082 | * lifetime.
1083 | */
1084 | void *
1085 | tvb_memdup(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, size_t length)
1086 | {
1087 | void *duped;
1088 |
1089 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1089, "tvb && tvb->initialized" ))));
1090 |
1091 | /*
1092 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1093 | * only supports an unsigned.
1094 | */
1095 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1095, "length <= (2147483647 *2U +1U)" ))));
1096 | validate_offset_length(tvb, offset, (unsigned)length);
1097 |
1098 | if (length == 0)
1099 | return NULL((void*)0);
1100 |
1101 | duped = wmem_alloc(scope, length);
1102 | return tvb_memcpy(tvb, duped, offset, length);
1103 | }
1104 |
1105 | #if 0
1106 | /* XXX - Is a _remaining variant of this necessary? The user would still need
1107 | * to get the length from tvb_captured_length_remaining() to productively use
1108 | * the (not necessarily null terminated) byte array. See also tvb_get_ptr(),
1109 | * which is similar. */
1110 | void *
1111 | tvb_memdup_remaining(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset)
1112 | {
1113 | void *duped;
1114 | unsigned length;
1115 |
1116 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1116, "tvb && tvb->initialized" ))));
1117 |
1118 | validate_offset_and_remaining(tvb, offset, &length);
1119 |
1120 | if (length == 0)
1121 | return NULL((void*)0);
1122 |
1123 | duped = wmem_alloc(scope, length);
1124 | return tvb_memcpy(tvb, duped, offset, length);
1125 | }
1126 | #endif
1127 |
1128 | const uint8_t*
1129 | tvb_get_ptr(tvbuff_t *tvb, const unsigned offset, const unsigned length)
1130 | {
1131 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1131, "tvb && tvb->initialized" ))));
1132 | return ensure_contiguous_unsigned(tvb, offset, length);
1133 | }
1134 |
1135 | /* ---------------- */
1136 | uint8_t
1137 | tvb_get_uint8(tvbuff_t *tvb, const unsigned offset)
1138 | {
1139 | const uint8_t *ptr;
1140 |
1141 | ptr = fast_ensure_contiguous(tvb, offset, 1);
1142 | return *ptr;
1143 | }
1144 |
1145 | int8_t
1146 | tvb_get_int8(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 | uint16_t
1155 | tvb_get_ntohs(tvbuff_t *tvb, const unsigned offset)
1156 | {
1157 | const uint8_t *ptr;
1158 |
1159 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1160 | return pntohu16(ptr);
1161 | }
1162 |
1163 | int16_t
1164 | tvb_get_ntohis(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 | uint32_t
1173 | tvb_get_ntoh24(tvbuff_t *tvb, const unsigned offset)
1174 | {
1175 | const uint8_t *ptr;
1176 |
1177 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1178 | return pntohu24(ptr);
1179 | }
1180 |
1181 | int32_t
1182 | tvb_get_ntohi24(tvbuff_t *tvb, const unsigned offset)
1183 | {
1184 | uint32_t ret;
1185 |
1186 | ret = ws_sign_ext32(tvb_get_ntoh24(tvb, offset), 24);
1187 |
1188 | return (int32_t)ret;
1189 | }
1190 |
1191 | uint32_t
1192 | tvb_get_ntohl(tvbuff_t *tvb, const unsigned offset)
1193 | {
1194 | const uint8_t *ptr;
1195 |
1196 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1197 | return pntohu32(ptr);
1198 | }
1199 |
1200 | int32_t
1201 | tvb_get_ntohil(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 | uint64_t
1210 | tvb_get_ntoh40(tvbuff_t *tvb, const unsigned offset)
1211 | {
1212 | const uint8_t *ptr;
1213 |
1214 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1215 | return pntohu40(ptr);
1216 | }
1217 |
1218 | int64_t
1219 | tvb_get_ntohi40(tvbuff_t *tvb, const unsigned offset)
1220 | {
1221 | uint64_t ret;
1222 |
1223 | ret = ws_sign_ext64(tvb_get_ntoh40(tvb, offset), 40);
1224 |
1225 | return (int64_t)ret;
1226 | }
1227 |
1228 | uint64_t
1229 | tvb_get_ntoh48(tvbuff_t *tvb, const unsigned offset)
1230 | {
1231 | const uint8_t *ptr;
1232 |
1233 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1234 | return pntohu48(ptr);
1235 | }
1236 |
1237 | int64_t
1238 | tvb_get_ntohi48(tvbuff_t *tvb, const unsigned offset)
1239 | {
1240 | uint64_t ret;
1241 |
1242 | ret = ws_sign_ext64(tvb_get_ntoh48(tvb, offset), 48);
1243 |
1244 | return (int64_t)ret;
1245 | }
1246 |
1247 | uint64_t
1248 | tvb_get_ntoh56(tvbuff_t *tvb, const unsigned offset)
1249 | {
1250 | const uint8_t *ptr;
1251 |
1252 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1253 | return pntohu56(ptr);
1254 | }
1255 |
1256 | int64_t
1257 | tvb_get_ntohi56(tvbuff_t *tvb, const unsigned offset)
1258 | {
1259 | uint64_t ret;
1260 |
1261 | ret = ws_sign_ext64(tvb_get_ntoh56(tvb, offset), 56);
1262 |
1263 | return (int64_t)ret;
1264 | }
1265 |
1266 | uint64_t
1267 | tvb_get_ntoh64(tvbuff_t *tvb, const unsigned offset)
1268 | {
1269 | const uint8_t *ptr;
1270 |
1271 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1272 | return pntohu64(ptr);
1273 | }
1274 |
1275 | int64_t
1276 | tvb_get_ntohi64(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 | uint16_t
1285 | tvb_get_uint16(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1286 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1287 | return tvb_get_letohs(tvb, offset);
1288 | } else {
1289 | return tvb_get_ntohs(tvb, offset);
1290 | }
1291 | }
1292 |
1293 | int16_t
1294 | tvb_get_int16(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1295 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1296 | return tvb_get_letohis(tvb, offset);
1297 | } else {
1298 | return tvb_get_ntohis(tvb, offset);
1299 | }
1300 | }
1301 |
1302 | uint32_t
1303 | tvb_get_uint24(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1304 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1305 | return tvb_get_letoh24(tvb, offset);
1306 | } else {
1307 | return tvb_get_ntoh24(tvb, offset);
1308 | }
1309 | }
1310 |
1311 | int32_t
1312 | tvb_get_int24(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1313 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1314 | return tvb_get_letohi24(tvb, offset);
1315 | } else {
1316 | return tvb_get_ntohi24(tvb, offset);
1317 | }
1318 | }
1319 |
1320 | uint32_t
1321 | tvb_get_uint32(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1322 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1323 | return tvb_get_letohl(tvb, offset);
1324 | } else {
1325 | return tvb_get_ntohl(tvb, offset);
1326 | }
1327 | }
1328 |
1329 | int32_t
1330 | tvb_get_int32(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1331 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1332 | return tvb_get_letohil(tvb, offset);
1333 | } else {
1334 | return tvb_get_ntohil(tvb, offset);
1335 | }
1336 | }
1337 |
1338 | uint64_t
1339 | tvb_get_uint40(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1340 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1341 | return tvb_get_letoh40(tvb, offset);
1342 | } else {
1343 | return tvb_get_ntoh40(tvb, offset);
1344 | }
1345 | }
1346 |
1347 | int64_t
1348 | tvb_get_int40(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1349 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1350 | return tvb_get_letohi40(tvb, offset);
1351 | } else {
1352 | return tvb_get_ntohi40(tvb, offset);
1353 | }
1354 | }
1355 |
1356 | uint64_t
1357 | tvb_get_uint48(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1358 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1359 | return tvb_get_letoh48(tvb, offset);
1360 | } else {
1361 | return tvb_get_ntoh48(tvb, offset);
1362 | }
1363 | }
1364 |
1365 | int64_t
1366 | tvb_get_int48(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1367 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1368 | return tvb_get_letohi48(tvb, offset);
1369 | } else {
1370 | return tvb_get_ntohi48(tvb, offset);
1371 | }
1372 | }
1373 |
1374 | uint64_t
1375 | tvb_get_uint56(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1376 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1377 | return tvb_get_letoh56(tvb, offset);
1378 | } else {
1379 | return tvb_get_ntoh56(tvb, offset);
1380 | }
1381 | }
1382 |
1383 | int64_t
1384 | tvb_get_int56(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1385 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1386 | return tvb_get_letohi56(tvb, offset);
1387 | } else {
1388 | return tvb_get_ntohi56(tvb, offset);
1389 | }
1390 | }
1391 |
1392 | uint64_t
1393 | tvb_get_uint64(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1394 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1395 | return tvb_get_letoh64(tvb, offset);
1396 | } else {
1397 | return tvb_get_ntoh64(tvb, offset);
1398 | }
1399 | }
1400 |
1401 | uint64_t
1402 | tvb_get_uint64_with_length(tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
1403 | {
1404 | uint64_t value;
1405 |
1406 | switch (length) {
1407 |
1408 | case 1:
1409 | value = tvb_get_uint8(tvb, offset);
1410 | break;
1411 |
1412 | case 2:
1413 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohs(tvb, offset)
1414 | : tvb_get_ntohs(tvb, offset);
1415 | break;
1416 |
1417 | case 3:
1418 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh24(tvb, offset)
1419 | : tvb_get_ntoh24(tvb, offset);
1420 | break;
1421 |
1422 | case 4:
1423 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohl(tvb, offset)
1424 | : tvb_get_ntohl(tvb, offset);
1425 | break;
1426 |
1427 | case 5:
1428 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh40(tvb, offset)
1429 | : tvb_get_ntoh40(tvb, offset);
1430 | break;
1431 |
1432 | case 6:
1433 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh48(tvb, offset)
1434 | : tvb_get_ntoh48(tvb, offset);
1435 | break;
1436 |
1437 | case 7:
1438 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh56(tvb, offset)
1439 | : tvb_get_ntoh56(tvb, offset);
1440 | break;
1441 |
1442 | case 8:
1443 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1444 | : tvb_get_ntoh64(tvb, offset);
1445 | break;
1446 |
1447 | default:
1448 | if (length < 1) {
1449 | value = 0;
1450 | } else {
1451 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1452 | : tvb_get_ntoh64(tvb, offset);
1453 | }
1454 | break;
1455 | }
1456 | return value;
1457 | }
1458 |
1459 | int64_t
1460 | tvb_get_int64(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1461 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1462 | return tvb_get_letohi64(tvb, offset);
1463 | } else {
1464 | return tvb_get_ntohi64(tvb, offset);
1465 | }
1466 | }
1467 |
1468 | float
1469 | tvb_get_ieee_float(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1470 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1471 | return tvb_get_letohieee_float(tvb, offset);
1472 | } else {
1473 | return tvb_get_ntohieee_float(tvb, offset);
1474 | }
1475 | }
1476 |
1477 | double
1478 | tvb_get_ieee_double(tvbuff_t *tvb, const unsigned offset, const unsigned encoding) {
1479 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1480 | return tvb_get_letohieee_double(tvb, offset);
1481 | } else {
1482 | return tvb_get_ntohieee_double(tvb, offset);
1483 | }
1484 | }
1485 |
1486 | /*
1487 | * Stuff for IEEE float handling on platforms that don't have IEEE
1488 | * format as the native floating-point format.
1489 | *
1490 | * For now, we treat only the VAX as such a platform.
1491 | *
1492 | * XXX - other non-IEEE boxes that can run UN*X include some Crays,
1493 | * and possibly other machines. However, I don't know whether there
1494 | * are any other machines that could run Wireshark and that don't use
1495 | * IEEE format. As far as I know, all of the main current and past
1496 | * commercial microprocessor families on which OSes that support
1497 | * Wireshark can run use IEEE format (x86, ARM, 68k, SPARC, MIPS,
1498 | * PA-RISC, Alpha, IA-64, and so on), and it appears that the official
1499 | * Linux port to System/390 and zArchitecture uses IEEE format floating-
1500 | * point rather than IBM hex floating-point (not a huge surprise), so
1501 | * I'm not sure that leaves any 32-bit or larger UN*X or Windows boxes,
1502 | * other than VAXes, that don't use IEEE format. If you're not running
1503 | * UN*X or Windows, the floating-point format is probably going to be
1504 | * the least of your problems in a port.
1505 | */
1506 |
1507 | #if defined(vax)
1508 |
1509 | #include <math.h>
1510 |
1511 | /*
1512 | * Single-precision.
1513 | */
1514 | #define IEEE_SP_NUMBER_WIDTH 32 /* bits in number */
1515 | #define IEEE_SP_EXP_WIDTH 8 /* bits in exponent */
1516 | #define IEEE_SP_MANTISSA_WIDTH 23 /* IEEE_SP_NUMBER_WIDTH - 1 - IEEE_SP_EXP_WIDTH */
1517 |
1518 | #define IEEE_SP_SIGN_MASK 0x80000000
1519 | #define IEEE_SP_EXPONENT_MASK 0x7F800000
1520 | #define IEEE_SP_MANTISSA_MASK 0x007FFFFF
1521 | #define IEEE_SP_INFINITY IEEE_SP_EXPONENT_MASK
1522 |
1523 | #define IEEE_SP_IMPLIED_BIT (1 << IEEE_SP_MANTISSA_WIDTH)
1524 | #define IEEE_SP_INFINITE ((1 << IEEE_SP_EXP_WIDTH) - 1)
1525 | #define IEEE_SP_BIAS ((1 << (IEEE_SP_EXP_WIDTH - 1)) - 1)
1526 |
1527 | static int
1528 | ieee_float_is_zero(const uint32_t w)
1529 | {
1530 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1531 | }
1532 |
1533 | static float
1534 | get_ieee_float(const uint32_t w)
1535 | {
1536 | long sign;
1537 | long exponent;
1538 | long mantissa;
1539 |
1540 | sign = w & IEEE_SP_SIGN_MASK;
1541 | exponent = w & IEEE_SP_EXPONENT_MASK;
1542 | mantissa = w & IEEE_SP_MANTISSA_MASK;
1543 |
1544 | if (ieee_float_is_zero(w)) {
1545 | /* number is zero, unnormalized, or not-a-number */
1546 | return 0.0;
1547 | }
1548 | #if 0
1549 | /*
1550 | * XXX - how to handle this?
1551 | */
1552 | if (IEEE_SP_INFINITY == exponent) {
1553 | /*
1554 | * number is positive or negative infinity, or a special value
1555 | */
1556 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1557 | }
1558 | #endif
1559 |
1560 | exponent = ((exponent >> IEEE_SP_MANTISSA_WIDTH) - IEEE_SP_BIAS) -
1561 | IEEE_SP_MANTISSA_WIDTH;
1562 | mantissa |= IEEE_SP_IMPLIED_BIT;
1563 |
1564 | if (sign)
1565 | return -mantissa * pow(2, exponent);
1566 | else
1567 | return mantissa * pow(2, exponent);
1568 | }
1569 |
1570 | /*
1571 | * Double-precision.
1572 | * We assume that if you don't have IEEE floating-point, you have a
1573 | * compiler that understands 64-bit integral quantities.
1574 | */
1575 | #define IEEE_DP_NUMBER_WIDTH 64 /* bits in number */
1576 | #define IEEE_DP_EXP_WIDTH 11 /* bits in exponent */
1577 | #define IEEE_DP_MANTISSA_WIDTH 52 /* IEEE_DP_NUMBER_WIDTH - 1 - IEEE_DP_EXP_WIDTH */
1578 |
1579 | #define IEEE_DP_SIGN_MASK INT64_C(0x8000000000000000)0x8000000000000000L
1580 | #define IEEE_DP_EXPONENT_MASK INT64_C(0x7FF0000000000000)0x7FF0000000000000L
1581 | #define IEEE_DP_MANTISSA_MASK INT64_C(0x000FFFFFFFFFFFFF)0x000FFFFFFFFFFFFFL
1582 | #define IEEE_DP_INFINITY IEEE_DP_EXPONENT_MASK
1583 |
1584 | #define IEEE_DP_IMPLIED_BIT (INT64_C(1)1L << IEEE_DP_MANTISSA_WIDTH)
1585 | #define IEEE_DP_INFINITE ((1 << IEEE_DP_EXP_WIDTH) - 1)
1586 | #define IEEE_DP_BIAS ((1 << (IEEE_DP_EXP_WIDTH - 1)) - 1)
1587 |
1588 | static int
1589 | ieee_double_is_zero(const uint64_t w)
1590 | {
1591 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1592 | }
1593 |
1594 | static double
1595 | get_ieee_double(const uint64_t w)
1596 | {
1597 | int64_t sign;
1598 | int64_t exponent;
1599 | int64_t mantissa;
1600 |
1601 | sign = w & IEEE_DP_SIGN_MASK;
1602 | exponent = w & IEEE_DP_EXPONENT_MASK;
1603 | mantissa = w & IEEE_DP_MANTISSA_MASK;
1604 |
1605 | if (ieee_double_is_zero(w)) {
1606 | /* number is zero, unnormalized, or not-a-number */
1607 | return 0.0;
1608 | }
1609 | #if 0
1610 | /*
1611 | * XXX - how to handle this?
1612 | */
1613 | if (IEEE_DP_INFINITY == exponent) {
1614 | /*
1615 | * number is positive or negative infinity, or a special value
1616 | */
1617 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1618 | }
1619 | #endif
1620 |
1621 | exponent = ((exponent >> IEEE_DP_MANTISSA_WIDTH) - IEEE_DP_BIAS) -
1622 | IEEE_DP_MANTISSA_WIDTH;
1623 | mantissa |= IEEE_DP_IMPLIED_BIT;
1624 |
1625 | if (sign)
1626 | return -mantissa * pow(2, exponent);
1627 | else
1628 | return mantissa * pow(2, exponent);
1629 | }
1630 | #endif
1631 |
1632 | /*
1633 | * Fetches an IEEE single-precision floating-point number, in
1634 | * big-endian form, and returns a "float".
1635 | *
1636 | * XXX - should this be "double", in case there are IEEE single-
1637 | * precision numbers that won't fit in some platform's native
1638 | * "float" format?
1639 | */
1640 | float
1641 | tvb_get_ntohieee_float(tvbuff_t *tvb, const unsigned offset)
1642 | {
1643 | #if defined(vax)
1644 | return get_ieee_float(tvb_get_ntohl(tvb, offset));
1645 | #else
1646 | union {
1647 | float f;
1648 | uint32_t w;
1649 | } ieee_fp_union;
1650 |
1651 | ieee_fp_union.w = tvb_get_ntohl(tvb, offset);
1652 | return ieee_fp_union.f;
1653 | #endif
1654 | }
1655 |
1656 | /*
1657 | * Fetches an IEEE double-precision floating-point number, in
1658 | * big-endian form, and returns a "double".
1659 | */
1660 | double
1661 | tvb_get_ntohieee_double(tvbuff_t *tvb, const unsigned offset)
1662 | {
1663 | #if defined(vax)
1664 | union {
1665 | uint32_t w[2];
1666 | uint64_t dw;
1667 | } ieee_fp_union;
1668 | #else
1669 | union {
1670 | double d;
1671 | uint32_t w[2];
1672 | } ieee_fp_union;
1673 | #endif
1674 |
1675 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1676 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset);
1677 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset+4);
1678 | #else
1679 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset+4);
1680 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset);
1681 | #endif
1682 | #if defined(vax)
1683 | return get_ieee_double(ieee_fp_union.dw);
1684 | #else
1685 | return ieee_fp_union.d;
1686 | #endif
1687 | }
1688 |
1689 | uint16_t
1690 | tvb_get_letohs(tvbuff_t *tvb, const unsigned offset)
1691 | {
1692 | const uint8_t *ptr;
1693 |
1694 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1695 | return pletohu16(ptr);
1696 | }
1697 |
1698 | int16_t
1699 | tvb_get_letohis(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 | uint32_t
1708 | tvb_get_letoh24(tvbuff_t *tvb, const unsigned offset)
1709 | {
1710 | const uint8_t *ptr;
1711 |
1712 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1713 | return pletohu24(ptr);
1714 | }
1715 |
1716 | int32_t
1717 | tvb_get_letohi24(tvbuff_t *tvb, const unsigned offset)
1718 | {
1719 | uint32_t ret;
1720 |
1721 | ret = ws_sign_ext32(tvb_get_letoh24(tvb, offset), 24);
1722 |
1723 | return (int32_t)ret;
1724 | }
1725 |
1726 | uint32_t
1727 | tvb_get_letohl(tvbuff_t *tvb, const unsigned offset)
1728 | {
1729 | const uint8_t *ptr;
1730 |
1731 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1732 | return pletohu32(ptr);
1733 | }
1734 |
1735 | int32_t
1736 | tvb_get_letohil(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 | uint64_t
1745 | tvb_get_letoh40(tvbuff_t *tvb, const unsigned offset)
1746 | {
1747 | const uint8_t *ptr;
1748 |
1749 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1750 | return pletohu40(ptr);
1751 | }
1752 |
1753 | int64_t
1754 | tvb_get_letohi40(tvbuff_t *tvb, const unsigned offset)
1755 | {
1756 | uint64_t ret;
1757 |
1758 | ret = ws_sign_ext64(tvb_get_letoh40(tvb, offset), 40);
1759 |
1760 | return (int64_t)ret;
1761 | }
1762 |
1763 | uint64_t
1764 | tvb_get_letoh48(tvbuff_t *tvb, const unsigned offset)
1765 | {
1766 | const uint8_t *ptr;
1767 |
1768 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1769 | return pletohu48(ptr);
1770 | }
1771 |
1772 | int64_t
1773 | tvb_get_letohi48(tvbuff_t *tvb, const unsigned offset)
1774 | {
1775 | uint64_t ret;
1776 |
1777 | ret = ws_sign_ext64(tvb_get_letoh48(tvb, offset), 48);
1778 |
1779 | return (int64_t)ret;
1780 | }
1781 |
1782 | uint64_t
1783 | tvb_get_letoh56(tvbuff_t *tvb, const unsigned offset)
1784 | {
1785 | const uint8_t *ptr;
1786 |
1787 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1788 | return pletohu56(ptr);
1789 | }
1790 |
1791 | int64_t
1792 | tvb_get_letohi56(tvbuff_t *tvb, const unsigned offset)
1793 | {
1794 | uint64_t ret;
1795 |
1796 | ret = ws_sign_ext64(tvb_get_letoh56(tvb, offset), 56);
1797 |
1798 | return (int64_t)ret;
1799 | }
1800 |
1801 | uint64_t
1802 | tvb_get_letoh64(tvbuff_t *tvb, const unsigned offset)
1803 | {
1804 | const uint8_t *ptr;
1805 |
1806 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1807 | return pletohu64(ptr);
1808 | }
1809 |
1810 | int64_t
1811 | tvb_get_letohi64(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 | /*
1820 | * Fetches an IEEE single-precision floating-point number, in
1821 | * little-endian form, and returns a "float".
1822 | *
1823 | * XXX - should this be "double", in case there are IEEE single-
1824 | * precision numbers that won't fit in some platform's native
1825 | * "float" format?
1826 | */
1827 | float
1828 | tvb_get_letohieee_float(tvbuff_t *tvb, const unsigned offset)
1829 | {
1830 | #if defined(vax)
1831 | return get_ieee_float(tvb_get_letohl(tvb, offset));
1832 | #else
1833 | union {
1834 | float f;
1835 | uint32_t w;
1836 | } ieee_fp_union;
1837 |
1838 | ieee_fp_union.w = tvb_get_letohl(tvb, offset);
1839 | return ieee_fp_union.f;
1840 | #endif
1841 | }
1842 |
1843 | /*
1844 | * Fetches an IEEE double-precision floating-point number, in
1845 | * little-endian form, and returns a "double".
1846 | */
1847 | double
1848 | tvb_get_letohieee_double(tvbuff_t *tvb, const unsigned offset)
1849 | {
1850 | #if defined(vax)
1851 | union {
1852 | uint32_t w[2];
1853 | uint64_t dw;
1854 | } ieee_fp_union;
1855 | #else
1856 | union {
1857 | double d;
1858 | uint32_t w[2];
1859 | } ieee_fp_union;
1860 | #endif
1861 |
1862 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1863 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset+4);
1864 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset);
1865 | #else
1866 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset);
1867 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset+4);
1868 | #endif
1869 | #if defined(vax)
1870 | return get_ieee_double(ieee_fp_union.dw);
1871 | #else
1872 | return ieee_fp_union.d;
1873 | #endif
1874 | }
1875 |
1876 | /* This function is a slight misnomer. It accepts all encodings that are
1877 | * ASCII "enough", which means encodings that are the same as US-ASCII
1878 | * for textual representations of dates and hex bytes; i.e., the same
1879 | * for the hex digits and Z (in practice, all alphanumerics), and the
1880 | * four separators ':' '-' '.' and ' '
1881 | * That means that any encoding that keeps the ISO/IEC 646 invariant
1882 | * characters the same (including the T.61 8 bit encoding and multibyte
1883 | * encodings like EUC-KR and GB18030) are OK, even if they replace characters
1884 | * like '$' '#' and '\' with national variants, but not encodings like UTF-16
1885 | * that include extra null bytes.
1886 | * For our current purposes, the unpacked GSM 7-bit default alphabet (but not
1887 | * all National Language Shift Tables) also satisfies this requirement, but
1888 | * note that it does *not* keep all ISO/IEC 646 invariant characters the same.
1889 | * If this internal function gets used for additional purposes than currently,
1890 | * the set of encodings that it accepts could change.
1891 | * */
1892 | static inline void
1893 | validate_single_byte_ascii_encoding(const unsigned encoding)
1894 | {
1895 | const unsigned enc = encoding & ~ENC_CHARENCODING_MASK0x0000FFFE;
1896 |
1897 | switch (enc) {
1898 | case ENC_UTF_160x00000004:
1899 | case ENC_UCS_20x00000006:
1900 | case ENC_UCS_40x00000008:
1901 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
1902 | case ENC_ASCII_7BITS0x00000034:
1903 | case ENC_EBCDIC0x0000002E:
1904 | case ENC_EBCDIC_CP0370x00000038:
1905 | case ENC_EBCDIC_CP5000x00000060:
1906 | case ENC_BCD_DIGITS_0_90x00000044:
1907 | case ENC_KEYPAD_ABC_TBCD0x00000046:
1908 | case ENC_KEYPAD_BC_TBCD0x00000048:
1909 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
1910 | case ENC_APN_STR0x00000054:
1911 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
1912 | 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" );
1913 | break;
1914 | default:
1915 | break;
1916 | }
1917 | /* make sure something valid was set */
1918 | if (enc == 0)
1919 | 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" );
1920 | }
1921 |
1922 | GByteArray*
1923 | tvb_get_string_bytes(tvbuff_t *tvb, const unsigned offset, const unsigned length,
1924 | const unsigned encoding, GByteArray *bytes, unsigned *endoff)
1925 | {
1926 | char *ptr;
1927 | const char *begin;
1928 | const char *end = NULL((void*)0);
1929 | GByteArray *retval = NULL((void*)0);
1930 |
1931 | validate_single_byte_ascii_encoding(encoding);
1932 |
1933 | ptr = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1934 | begin = ptr;
1935 |
1936 | if (endoff) *endoff = offset;
1937 |
1938 | while (*begin == ' ') begin++;
1939 |
1940 | if (*begin && bytes) {
1941 | if (hex_str_to_bytes_encoding(begin, bytes, &end, encoding, false0)) {
1942 | if (bytes->len > 0) {
1943 | if (endoff) *endoff = offset + (unsigned)(end - ptr);
1944 | retval = bytes;
1945 | }
1946 | }
1947 | }
1948 |
1949 | wmem_free(NULL((void*)0), ptr);
1950 |
1951 | return retval;
1952 | }
1953 |
1954 | static bool_Bool
1955 | parse_month_name(const char *name, int *tm_mon)
1956 | {
1957 | static const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May",
1958 | "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1959 | for (int i = 0; i < 12; i++) {
1960 | if (memcmp(months[i], name, 4) == 0) {
1961 | *tm_mon = i;
1962 | return true1;
1963 | }
1964 | }
1965 | return false0;
1966 | }
1967 |
1968 | bool_Bool
1969 | tvb_get_string_uint64(tvbuff_t *tvb, const unsigned offset, const unsigned length,
1970 | const unsigned encoding, uint64_t *value, unsigned *endoff)
1971 | {
1972 | const uint8_t *ptr;
1973 | const uint8_t *endptr;
1974 | const uint8_t **endptrptr = endoff ? &endptr : NULL((void*)0);
1975 | bool_Bool success;
1976 |
1977 | validate_single_byte_ascii_encoding(encoding);
1978 |
1979 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
1980 |
1981 | switch (encoding & ENC_STRING0x07000000) {
1982 | case ENC_STR_HEX0x02000000:
1983 | success = ws_hexbuftou64(ptr, length, endptrptr, value);
1984 | break;
1985 | case ENC_STR_DEC0x04000000:
1986 | success = ws_buftou64(ptr, length, endptrptr, value);
1987 | break;
1988 | case ENC_STR_NUM0x01000000:
1989 | default:
1990 | success = ws_basebuftou64(ptr, length, endptrptr, value, 0);
1991 | }
1992 |
1993 | if (endoff) {
1994 | // 0 <= endptr - ptr <= length
1995 | *endoff = offset + (uint32_t)(endptr - ptr);
1996 | }
1997 |
1998 | return success;
1999 | }
2000 |
2001 | bool_Bool
2002 | tvb_get_string_uint(tvbuff_t *tvb, const unsigned offset, const unsigned length,
2003 | const unsigned encoding, uint32_t *value, unsigned *endoff)
2004 | {
2005 | const uint8_t *ptr;
2006 | const uint8_t *endptr;
2007 | const uint8_t **endptrptr = endoff ? &endptr : NULL((void*)0);
2008 | bool_Bool success;
2009 |
2010 | validate_single_byte_ascii_encoding(encoding);
2011 |
2012 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
2013 |
2014 | switch (encoding & ENC_STRING0x07000000) {
2015 | case ENC_STR_HEX0x02000000:
2016 | success = ws_hexbuftou32(ptr, length, endptrptr, value);
2017 | break;
2018 | case ENC_STR_DEC0x04000000:
2019 | success = ws_buftou32(ptr, length, endptrptr, value);
2020 | break;
2021 | case ENC_STR_NUM0x01000000:
2022 | default:
2023 | success = ws_basebuftou32(ptr, length, endptrptr, value, 0);
2024 | }
2025 |
2026 | if (endoff) {
2027 | // 0 <= endptr - ptr <= length
2028 | *endoff = offset + (uint32_t)(endptr - ptr);
2029 | }
2030 |
2031 | return success;
2032 | }
2033 |
2034 | /*
2035 | * Is the character a WSP character, as per RFC 5234? (space or tab).
2036 | */
2037 | #define IS_WSP(c)((c) == ' ' || (c) == '\t') ((c) == ' ' || (c) == '\t')
2038 |
2039 | /* support hex-encoded time values? */
2040 | nstime_t*
2041 | tvb_get_string_time(tvbuff_t *tvb, const unsigned offset, const unsigned length,
2042 | const unsigned encoding, nstime_t *ns, unsigned *endoff)
2043 | {
2044 | char *begin;
2045 | const char *ptr;
2046 | const char *end = NULL((void*)0);
2047 | int num_chars = 0;
2048 | int utc_offset = 0;
2049 |
2050 | validate_single_byte_ascii_encoding(encoding);
2051 |
2052 | DISSECTOR_ASSERT(ns)((void) ((ns) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 2052, "ns"))));
2053 |
2054 | begin = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
2055 | ptr = begin;
2056 |
2057 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2058 | ptr++;
2059 |
2060 | if (*ptr) {
2061 | if ((encoding & ENC_ISO_8601_DATE_TIME0x00030000) == ENC_ISO_8601_DATE_TIME0x00030000) {
2062 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME))) {
2063 |
2064 |
2065 | goto fail;
2066 | }
2067 | } else if ((encoding & ENC_ISO_8601_DATE_TIME_BASIC0x00100000) == ENC_ISO_8601_DATE_TIME_BASIC0x00100000) {
2068 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME_BASIC))) {
2069 |
2070 |
2071 | goto fail;
2072 | }
2073 | } else {
2074 | struct tm tm;
2075 |
2076 | memset(&tm, 0, sizeof(tm));
2077 | tm.tm_isdst = -1;
2078 | ns->secs = 0;
2079 | ns->nsecs = 0;
2080 |
2081 | /* note: sscanf is known to be inconsistent across platforms with respect
2082 | to whether a %n is counted as a return value or not, so we have to use
2083 | '>=' a lot */
2084 | if (encoding & ENC_ISO_8601_DATE0x00010000) {
2085 | /* 2014-04-07 */
2086 | if (sscanf(ptr, "%d-%d-%d%n",
2087 | &tm.tm_year,
2088 | &tm.tm_mon,
2089 | &tm.tm_mday,
2090 | &num_chars) >= 3)
2091 | {
2092 | end = ptr + num_chars;
2093 | tm.tm_mon--;
2094 | if (tm.tm_year > 1900) tm.tm_year -= 1900;
2095 | } else {
2096 | goto fail;
2097 | }
2098 | }
2099 | else if (encoding & ENC_ISO_8601_TIME0x00020000) {
2100 | /* 2014-04-07 */
2101 | if (sscanf(ptr, "%d:%d:%d%n",
2102 | &tm.tm_hour,
2103 | &tm.tm_min,
2104 | &tm.tm_sec,
2105 | &num_chars) >= 2)
2106 | {
2107 | /* what should we do about day/month/year? */
2108 | /* setting it to "now" for now */
2109 | time_t time_now = time(NULL((void*)0));
2110 | struct tm *tm_now = gmtime(&time_now);
2111 | if (tm_now != NULL((void*)0)) {
2112 | tm.tm_year = tm_now->tm_year;
2113 | tm.tm_mon = tm_now->tm_mon;
2114 | tm.tm_mday = tm_now->tm_mday;
2115 | } else {
2116 | /* The second before the Epoch */
2117 | tm.tm_year = 69;
2118 | tm.tm_mon = 12;
2119 | tm.tm_mday = 31;
2120 | }
2121 | end = ptr + num_chars;
2122 | } else {
2123 | goto fail;
2124 | }
2125 | }
2126 | else if (encoding & ENC_IMF_DATE_TIME0x00040000) {
2127 | /*
2128 | * Match [dow,] day month year hh:mm[:ss] with
2129 | * two-digit years (RFC 822) or four-digit
2130 | * years (RFCs 1123, 2822, 5822). Skip
2131 | * the day of week since it is locale
2132 | * dependent and does not affect the resulting
2133 | * date anyway.
2134 | */
2135 | 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] == ',')
2136 | ptr += 4; /* Skip day of week. */
2137 |
2138 | /*
2139 | * Parse the day-of-month and month
2140 | * name.
2141 | */
2142 | char month_name[4] = { 0 };
2143 |
2144 | if (sscanf(ptr, "%d %3s%n",
2145 | &tm.tm_mday,
2146 | month_name,
2147 | &num_chars) < 2)
2148 | {
2149 | /* Not matched. */
2150 | goto fail;
2151 | }
2152 | if (!parse_month_name(month_name, &tm.tm_mon)) {
2153 | goto fail;
2154 | }
2155 | ptr += num_chars;
2156 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2157 | ptr++;
2158 |
2159 | /*
2160 | * Scan the year. Treat 2-digit years
2161 | * differently from 4-digit years.
2162 | */
2163 | uint32_t year;
2164 | const char *yearendp;
2165 |
2166 | if (!ws_strtou32(ptr, &yearendp, &year)) {
2167 | goto fail;
2168 | }
2169 | if (!IS_WSP(*yearendp)((*yearendp) == ' ' || (*yearendp) == '\t')) {
2170 | /* Not followed by WSP. */
2171 | goto fail;
2172 | }
2173 | if (yearendp - ptr < 2) {
2174 | /* 1-digit year. Error. */
2175 | goto fail;
2176 | }
2177 | if (yearendp - ptr == 2) {
2178 | /*
2179 | * 2-digit year.
2180 | *
2181 | * Match RFC 2822/RFC 5322 behavior;
2182 | * add 2000 to years from 0 to
2183 | * 49 and 1900 to uears from 50
2184 | * to 99.
2185 | */
2186 | if (year <= 49) {
2187 | year += 2000;
2188 | } else {
2189 | year += 1900;
2190 | }
2191 | } else if (yearendp - ptr == 3) {
2192 | /*
2193 | * 3-digit year.
2194 | *
2195 | * Match RFC 2822/RFC 5322 behavior;
2196 | * add 1900 to the year.
2197 | */
2198 | year += 1900;
2199 | }
2200 | tm.tm_year = year - 1900;
2201 | ptr = yearendp;
2202 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2203 | ptr++;
2204 |
2205 | /* Parse the time. */
2206 | if (sscanf(ptr, "%d:%d%n:%d%n",
2207 | &tm.tm_hour,
2208 | &tm.tm_min,
2209 | &num_chars,
2210 | &tm.tm_sec,
2211 | &num_chars) < 2)
2212 | {
2213 | goto fail;
2214 | }
2215 | ptr += num_chars;
2216 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2217 | ptr++;
2218 |
2219 | /*
2220 | * Parse the time zone.
2221 | * Check for obs-zone values first.
2222 | */
2223 | if (g_ascii_strncasecmp(ptr, "UT", 2) == 0)
2224 | {
2225 | ptr += 2;
2226 | }
2227 | else if (g_ascii_strncasecmp(ptr, "GMT", 3) == 0)
2228 | {
2229 | ptr += 3;
2230 | }
2231 | else
2232 | {
2233 | char sign;
2234 | int off_hr;
2235 | int off_min;
2236 |
2237 | if (sscanf(ptr, "%c%2d%2d%n",
2238 | &sign,
2239 | &off_hr,
2240 | &off_min,
2241 | &num_chars) < 3)
2242 | {
2243 | goto fail;
2244 | }
2245 |
2246 | /*
2247 | * If sign is '+', there's a positive
2248 | * UTC offset.
2249 | *
2250 | * If sign is '-', there's a negative
2251 | * UTC offset.
2252 | *
2253 | * Otherwise, that's an invalid UTC
2254 | * offset string.
2255 | */
2256 | if (sign == '+')
2257 | utc_offset += (off_hr * 3600) + (off_min * 60);
2258 | else if (sign == '-')
2259 | utc_offset -= (off_hr * 3600) + (off_min * 60);
2260 | else {
2261 | /* Sign must be + or - */
2262 | goto fail;
2263 | }
2264 | ptr += num_chars;
2265 | }
2266 | end = ptr;
2267 | }
2268 | ns->secs = mktime_utc(&tm);
2269 | if (ns->secs == (time_t)-1 && errno(*__errno_location ()) != 0) {
2270 | goto fail;
2271 | }
2272 | ns->secs += utc_offset;
2273 | }
2274 | } else {
2275 | /* Empty string */
2276 | goto fail;
2277 | }
2278 |
2279 | if (endoff)
2280 | *endoff = (unsigned)(offset + (end - begin));
2281 | wmem_free(NULL((void*)0), begin);
2282 | return ns;
2283 |
2284 | fail:
2285 | wmem_free(NULL((void*)0), begin);
2286 | return NULL((void*)0);
2287 | }
2288 |
2289 | /* Fetch an IPv4 address, in network byte order.
2290 | * We do *not* convert them to host byte order; we leave them in
2291 | * network byte order. */
2292 | uint32_t
2293 | tvb_get_ipv4(tvbuff_t *tvb, const unsigned offset)
2294 | {
2295 | const uint8_t *ptr;
2296 | uint32_t addr;
2297 |
2298 | ptr = fast_ensure_contiguous(tvb, offset, sizeof(uint32_t));
2299 | memcpy(&addr, ptr, sizeof addr);
2300 | return addr;
2301 | }
2302 |
2303 | /* Fetch an IPv6 address. */
2304 | void
2305 | tvb_get_ipv6(tvbuff_t *tvb, const unsigned offset, ws_in6_addr *addr)
2306 | {
2307 | const uint8_t *ptr;
2308 |
2309 | ptr = ensure_contiguous_unsigned(tvb, offset, sizeof(*addr));
2310 | memcpy(addr, ptr, sizeof *addr);
2311 | }
2312 |
2313 | /*
2314 | * These routines return the length of the address in bytes on success
2315 | * and -1 if the prefix length is too long.
2316 | */
2317 | int
2318 | tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, const unsigned offset, ws_in4_addr *addr,
2319 | uint32_t prefix_len)
2320 | {
2321 | uint8_t addr_len;
2322 |
2323 | if (prefix_len > 32)
2324 | return -1;
2325 |
2326 | addr_len = (prefix_len + 7) / 8;
2327 | *addr = 0;
2328 | tvb_memcpy(tvb, addr, offset, addr_len);
2329 | if (prefix_len % 8)
2330 | ((uint8_t*)addr)[addr_len - 1] &= ((0xff00 >> (prefix_len % 8)) & 0xff);
2331 | return addr_len;
2332 | }
2333 |
2334 | /*
2335 | * These routines return the length of the address in bytes on success
2336 | * and -1 if the prefix length is too long.
2337 | */
2338 | int
2339 | tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, const unsigned offset, ws_in6_addr *addr,
2340 | uint32_t prefix_len)
2341 | {
2342 | uint32_t addr_len;
2343 |
2344 | if (prefix_len > 128)
2345 | return -1;
2346 |
2347 | addr_len = (prefix_len + 7) / 8;
2348 | memset(addr->bytes, 0, 16);
2349 | tvb_memcpy(tvb, addr->bytes, offset, addr_len);
2350 | if (prefix_len % 8) {
2351 | addr->bytes[addr_len - 1] &=
2352 | ((0xff00 >> (prefix_len % 8)) & 0xff);
2353 | }
2354 |
2355 | return addr_len;
2356 | }
2357 |
2358 | /* Fetch a GUID. */
2359 | void
2360 | tvb_get_ntohguid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid)
2361 | {
2362 | const uint8_t *ptr = ensure_contiguous_unsigned(tvb, offset, GUID_LEN16);
2363 |
2364 | guid->data1 = pntohu32(ptr + 0);
2365 | guid->data2 = pntohu16(ptr + 4);
2366 | guid->data3 = pntohu16(ptr + 6);
2367 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2368 | }
2369 |
2370 | void
2371 | tvb_get_letohguid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid)
2372 | {
2373 | const uint8_t *ptr = ensure_contiguous_unsigned(tvb, offset, GUID_LEN16);
2374 |
2375 | guid->data1 = pletohu32(ptr + 0);
2376 | guid->data2 = pletohu16(ptr + 4);
2377 | guid->data3 = pletohu16(ptr + 6);
2378 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2379 | }
2380 |
2381 | void
2382 | tvb_get_guid(tvbuff_t *tvb, const unsigned offset, e_guid_t *guid, const unsigned encoding)
2383 | {
2384 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2385 | tvb_get_letohguid(tvb, offset, guid);
2386 | } else {
2387 | tvb_get_ntohguid(tvb, offset, guid);
2388 | }
2389 | }
2390 |
2391 | static const uint8_t bit_mask8[] = {
2392 | 0x00,
2393 | 0x01,
2394 | 0x03,
2395 | 0x07,
2396 | 0x0f,
2397 | 0x1f,
2398 | 0x3f,
2399 | 0x7f,
2400 | 0xff
2401 | };
2402 |
2403 |
2404 | /* Get a variable amount of bits
2405 | *
2406 | * Return a byte array with bit limited data.
2407 | * When encoding is ENC_BIG_ENDIAN, the data is aligned to the left.
2408 | * When encoding is ENC_LITTLE_ENDIAN, the data is aligned to the right.
2409 | */
2410 | uint8_t *
2411 | tvb_get_bits_array(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned bit_offset,
2412 | size_t no_of_bits, size_t *data_length, const unsigned encoding)
2413 | {
2414 | tvbuff_t *sub_tvb;
2415 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1 | Assuming the condition is false | →
2 | ← | Taking false branch | →
2416 | sub_tvb = tvb_new_octet_right_aligned(tvb, bit_offset, (int32_t) no_of_bits);
2417 | } else {
2418 | sub_tvb = tvb_new_octet_aligned(tvb, bit_offset, (int32_t) no_of_bits);
3 | ← | Calling 'tvb_new_octet_aligned' | →
2419 | }
2420 | *data_length = tvb_reported_length(sub_tvb);
2421 | return (uint8_t*)tvb_memdup(scope, sub_tvb, 0, *data_length);
2422 | }
2423 |
2424 | /* Get 1 - 8 bits */
2425 | uint8_t
2426 | tvb_get_bits8(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits)
2427 | {
2428 | 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", 2428 , "no_of_bits <= 8", "Too many bits requested for 8-bit return type" ))));
2429 | return (uint8_t)_tvb_get_bits64(tvb, bit_offset, no_of_bits);
2430 | }
2431 |
2432 | /* Get 1 - 16 bits */
2433 | uint16_t
2434 | tvb_get_bits16(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2435 | {
2436 | 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", 2436 , "no_of_bits <= 16", "Too many bits requested for 16-bit return type" ))));
2437 | return (uint16_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2438 | }
2439 |
2440 | /* Get 1 - 32 bits */
2441 | uint32_t
2442 | tvb_get_bits32(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2443 | {
2444 | 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", 2444 , "no_of_bits <= 32", "Too many bits requested for 32-bit return type" ))));
2445 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2446 | }
2447 |
2448 | /* Get 1 - 64 bits */
2449 | uint64_t
2450 | tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2451 | {
2452 | 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", 2452 , "no_of_bits <= 64", "Too many bits requested for 64-bit return type" ))));
2453 |
2454 | /* encoding determines bit numbering within octet array */
2455 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2456 | return _tvb_get_bits64_le(tvb, bit_offset, no_of_bits);
2457 | } else {
2458 | return _tvb_get_bits64(tvb, bit_offset, no_of_bits);
2459 | }
2460 | }
2461 |
2462 | /*
2463 | * This function will dissect a sequence of bits that does not need to be byte aligned; the bits
2464 | * set will be shown in the tree as ..10 10.. and the integer value returned if return_value is set.
2465 | * Offset should be given in bits from the start of the tvb.
2466 | * Bits within octet are numbered from MSB (0) to LSB (7). Bit at bit_offset is return value most significant bit.
2467 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2468 | */
2469 | static uint64_t
2470 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const unsigned total_no_of_bits)
2471 | {
2472 | uint64_t value;
2473 | unsigned octet_offset = bit_offset >> 3;
2474 | uint8_t required_bits_in_first_octet = 8 - (bit_offset % 8);
2475 |
2476 | if(required_bits_in_first_octet > total_no_of_bits)
2477 | {
2478 | /* the required bits don't extend to the end of the first octet */
2479 | uint8_t right_shift = required_bits_in_first_octet - total_no_of_bits;
2480 | value = (tvb_get_uint8(tvb, octet_offset) >> right_shift) & bit_mask8[total_no_of_bits % 8];
2481 | }
2482 | else
2483 | {
2484 | uint8_t remaining_bit_length = total_no_of_bits;
2485 |
2486 | /* get the bits up to the first octet boundary */
2487 | value = 0;
2488 | required_bits_in_first_octet %= 8;
2489 | if(required_bits_in_first_octet != 0)
2490 | {
2491 | value = tvb_get_uint8(tvb, octet_offset) & bit_mask8[required_bits_in_first_octet];
2492 | remaining_bit_length -= required_bits_in_first_octet;
2493 | octet_offset ++;
2494 | }
2495 | /* take the biggest words, shorts or octets that we can */
2496 | while (remaining_bit_length > 7)
2497 | {
2498 | switch (remaining_bit_length >> 4)
2499 | {
2500 | case 0:
2501 | /* 8 - 15 bits. (note that 0 - 7 would have dropped out of the while() loop) */
2502 | value <<= 8;
2503 | value += tvb_get_uint8(tvb, octet_offset);
2504 | remaining_bit_length -= 8;
2505 | octet_offset ++;
2506 | break;
2507 |
2508 | case 1:
2509 | /* 16 - 31 bits */
2510 | value <<= 16;
2511 | value += tvb_get_ntohs(tvb, octet_offset);
2512 | remaining_bit_length -= 16;
2513 | octet_offset += 2;
2514 | break;
2515 |
2516 | case 2:
2517 | case 3:
2518 | /* 32 - 63 bits */
2519 | value <<= 32;
2520 | value += tvb_get_ntohl(tvb, octet_offset);
2521 | remaining_bit_length -= 32;
2522 | octet_offset += 4;
2523 | break;
2524 |
2525 | default:
2526 | /* 64 bits (or more???) */
2527 | value = tvb_get_ntoh64(tvb, octet_offset);
2528 | remaining_bit_length -= 64;
2529 | octet_offset += 8;
2530 | break;
2531 | }
2532 | }
2533 | /* get bits from any partial octet at the tail */
2534 | if(remaining_bit_length)
2535 | {
2536 | value <<= remaining_bit_length;
2537 | value += (tvb_get_uint8(tvb, octet_offset) >> (8 - remaining_bit_length));
2538 | }
2539 | }
2540 | return value;
2541 | }
2542 |
2543 | /*
2544 | * Offset should be given in bits from the start of the tvb.
2545 | * Bits within octet are numbered from LSB (0) to MSB (7). Bit at bit_offset is return value least significant bit.
2546 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2547 | */
2548 | static uint64_t
2549 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const unsigned total_no_of_bits)
2550 | {
2551 | uint64_t value = 0;
2552 | unsigned octet_offset = bit_offset / 8;
2553 | unsigned remaining_bits = total_no_of_bits;
2554 | unsigned shift = 0;
2555 |
2556 | if (remaining_bits > 64)
2557 | {
2558 | remaining_bits = 64;
2559 | }
2560 |
2561 | if (bit_offset % 8)
2562 | {
2563 | /* not aligned, extract bits from first octet */
2564 | shift = 8 - (bit_offset % 8);
2565 | value = tvb_get_uint8(tvb, octet_offset) >> (bit_offset % 8);
2566 | if (shift > remaining_bits)
2567 | {
2568 | /* keep only the requested bits */
2569 | value &= (UINT64_C(1)1UL << remaining_bits) - 1;
2570 | remaining_bits = 0;
2571 | }
2572 | else
2573 | {
2574 | remaining_bits -= shift;
2575 | }
2576 | octet_offset++;
2577 | }
2578 |
2579 | while (remaining_bits > 0)
2580 | {
2581 | /* take the biggest words, shorts or octets that we can */
2582 | if (remaining_bits >= 32)
2583 | {
2584 | value |= ((uint64_t)tvb_get_letohl(tvb, octet_offset) << shift);
2585 | shift += 32;
2586 | remaining_bits -= 32;
2587 | octet_offset += 4;
2588 | }
2589 | else if (remaining_bits >= 16)
2590 | {
2591 | value |= ((uint64_t)tvb_get_letohs(tvb, octet_offset) << shift);
2592 | shift += 16;
2593 | remaining_bits -= 16;
2594 | octet_offset += 2;
2595 | }
2596 | else if (remaining_bits >= 8)
2597 | {
2598 | value |= ((uint64_t)tvb_get_uint8(tvb, octet_offset) << shift);
2599 | shift += 8;
2600 | remaining_bits -= 8;
2601 | octet_offset += 1;
2602 | }
2603 | else
2604 | {
2605 | unsigned mask = (1 << remaining_bits) - 1;
2606 | value |= (((uint64_t)tvb_get_uint8(tvb, octet_offset) & mask) << shift);
2607 | shift += remaining_bits;
2608 | remaining_bits = 0;
2609 | octet_offset += 1;
2610 | }
2611 | }
2612 | return value;
2613 | }
2614 |
2615 | /* Get 1 - 32 bits (should be deprecated as same as tvb_get_bits32??) */
2616 | uint32_t
2617 | tvb_get_bits(tvbuff_t *tvb, const unsigned bit_offset, const unsigned no_of_bits, const unsigned encoding)
2618 | {
2619 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2620 | }
2621 |
2622 | static bool_Bool
2623 | tvb_find_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, uint8_t needle, unsigned *end_offset)
2624 | {
2625 | const uint8_t *ptr;
2626 | const uint8_t *result;
2627 |
2628 | if (end_offset) {
2629 | *end_offset = abs_offset + limit;
2630 | }
2631 |
2632 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr() */
2633 | if (!ptr)
2634 | return false0;
2635 |
2636 | result = (const uint8_t *) memchr(ptr, needle, limit);
2637 | if (!result)
2638 | return false0;
2639 |
2640 | if (end_offset) {
2641 | *end_offset = (unsigned)((result - ptr) + abs_offset);
2642 | }
2643 | return true1;
2644 | }
2645 |
2646 | static bool_Bool
2647 | _tvb_find_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, const uint8_t needle, unsigned *end_offset)
2648 | {
2649 | const uint8_t *result;
2650 |
2651 | /* If we have real data, perform our search now. */
2652 | if (tvb->real_data) {
2653 | result = (const uint8_t *)memchr(tvb->real_data + offset, needle, limit);
2654 | if (result == NULL((void*)0)) {
2655 | if (end_offset) {
2656 | *end_offset = offset + limit;
2657 | }
2658 | return false0;
2659 | }
2660 | else {
2661 | if (end_offset) {
2662 | *end_offset = (unsigned)(result - tvb->real_data);
2663 | }
2664 | return true1;
2665 | }
2666 | }
2667 |
2668 | if (tvb->ops->tvb_find_uint8)
2669 | return tvb->ops->tvb_find_uint8(tvb, offset, limit, needle, end_offset);
2670 |
2671 | return tvb_find_uint8_generic(tvb, offset, limit, needle, end_offset);
2672 | }
2673 |
2674 | bool_Bool
2675 | tvb_find_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, const uint8_t needle, unsigned *end_offset)
2676 | {
2677 | unsigned limit = 0;
2678 | int exception;
2679 |
2680 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2680, "tvb && tvb->initialized" ))));
2681 |
2682 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2683 | if (exception)
2684 | THROW(exception)except_throw(1, (exception), ((void*)0));
2685 |
2686 | /* Only search to end of tvbuff, w/o throwing exception. */
2687 | if (limit > maxlength) {
2688 | /* Maximum length doesn't go past end of tvbuff; search
2689 | to that value. */
2690 | limit = maxlength;
2691 | }
2692 |
2693 | return _tvb_find_uint8_length(tvb, offset, limit, needle, end_offset);
2694 | }
2695 |
2696 | bool_Bool
2697 | tvb_find_uint8_remaining(tvbuff_t *tvb, const unsigned offset, const uint8_t needle, unsigned *end_offset)
2698 | {
2699 | unsigned limit = 0;
2700 | int exception;
2701 |
2702 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2702, "tvb && tvb->initialized" ))));
2703 |
2704 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2705 | if (exception)
2706 | THROW(exception)except_throw(1, (exception), ((void*)0));
2707 |
2708 | return _tvb_find_uint8_length(tvb, offset, limit, needle, end_offset);
2709 | }
2710 |
2711 | static bool_Bool
2712 | _tvb_find_uint16_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, const uint16_t needle, unsigned *end_offset)
2713 | {
2714 | const uint8_t needle1 = ((needle & 0xFF00) >> 8);
2715 | const uint8_t needle2 = ((needle & 0x00FF) >> 0);
2716 | unsigned searched_bytes = 0;
2717 | unsigned pos = offset;
2718 |
2719 | if (end_offset) {
2720 | *end_offset = offset + limit;
2721 | }
2722 |
2723 | do {
2724 | if (!_tvb_find_uint8_length(tvb, pos, limit - searched_bytes, needle1, &pos)) {
2725 | return false0;
2726 | }
2727 |
2728 | /* Bytes searched so far (not counting the second byte) */
2729 | searched_bytes = pos - offset + 1;
2730 |
2731 | /* Test vs. equality to account for the second byte */
2732 | if (searched_bytes >= limit) {
2733 | return false0;
2734 | }
2735 |
2736 | if (_tvb_find_uint8_length(tvb, pos + 1, 1, needle2, NULL((void*)0))) {
2737 | if (end_offset) {
2738 | *end_offset = pos;
2739 | }
2740 | return true1;
2741 | }
2742 |
2743 | pos += 1;
2744 | searched_bytes += 1;
2745 | } while (searched_bytes < limit);
2746 |
2747 | return false0;
2748 | }
2749 |
2750 | bool_Bool
2751 | tvb_find_uint16_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, const uint16_t needle, unsigned *end_offset)
2752 | {
2753 | unsigned limit = 0;
2754 | int exception;
2755 |
2756 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2756, "tvb && tvb->initialized" ))));
2757 |
2758 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2759 | if (exception)
2760 | THROW(exception)except_throw(1, (exception), ((void*)0));
2761 |
2762 | /* Only search to end of tvbuff, w/o throwing exception. */
2763 | if (limit > maxlength) {
2764 | /* Maximum length doesn't go past end of tvbuff; search
2765 | to that value. */
2766 | limit = maxlength;
2767 | }
2768 |
2769 | return _tvb_find_uint16_length(tvb, offset, limit, needle, end_offset);
2770 | }
2771 |
2772 | bool_Bool
2773 | tvb_find_uint16_remaining(tvbuff_t *tvb, const unsigned offset, const uint16_t needle, unsigned *end_offset)
2774 | {
2775 | unsigned limit = 0;
2776 | int exception;
2777 |
2778 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2778, "tvb && tvb->initialized" ))));
2779 |
2780 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2781 | if (exception)
2782 | THROW(exception)except_throw(1, (exception), ((void*)0));
2783 |
2784 | return _tvb_find_uint16_length(tvb, offset, limit, needle, end_offset);
2785 | }
2786 |
2787 | static inline bool_Bool
2788 | 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)
2789 | {
2790 | const uint8_t *ptr;
2791 | const uint8_t *result;
2792 |
2793 | if (found_offset) {
2794 | *found_offset = abs_offset + limit;
2795 | }
2796 |
2797 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr */
2798 | if (!ptr)
2799 | return false0;
2800 |
2801 | result = ws_mempbrk_exec(ptr, limit, pattern, found_needle);
2802 | if (!result)
2803 | return false0;
2804 |
2805 | if (found_offset) {
2806 | *found_offset = (unsigned)((result - ptr) + abs_offset);
2807 | }
2808 | return true1;
2809 | }
2810 |
2811 | static bool_Bool
2812 | _tvb_ws_mempbrk_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit,
2813 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2814 | {
2815 | const uint8_t *result;
2816 |
2817 | /* If we have real data, perform our search now. */
2818 | if (tvb->real_data) {
2819 | result = ws_mempbrk_exec(tvb->real_data + offset, limit, pattern, found_needle);
2820 | if (result == NULL((void*)0)) {
2821 | if (found_offset) {
2822 | *found_offset = offset + limit;
2823 | }
2824 | return false0;
2825 | }
2826 | else {
2827 | if (found_offset) {
2828 | *found_offset = (unsigned)(result - tvb->real_data);
2829 | }
2830 | return true1;
2831 | }
2832 | }
2833 |
2834 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8)
2835 | return tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, offset, limit, pattern, found_offset, found_needle);
2836 |
2837 | return tvb_ws_mempbrk_uint8_generic(tvb, offset, limit, pattern, found_offset, found_needle);
2838 | }
2839 |
2840 | bool_Bool
2841 | tvb_ws_mempbrk_uint8_remaining(tvbuff_t *tvb, const unsigned offset,
2842 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2843 | {
2844 | unsigned limit = 0;
2845 | int exception;
2846 |
2847 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2847, "tvb && tvb->initialized" ))));
2848 |
2849 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2850 | if (exception)
2851 | THROW(exception)except_throw(1, (exception), ((void*)0));
2852 |
2853 | return _tvb_ws_mempbrk_uint8_length(tvb, offset, limit, pattern, found_offset, found_needle);
2854 | }
2855 |
2856 | bool_Bool
2857 | tvb_ws_mempbrk_uint8_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength,
2858 | const ws_mempbrk_pattern* pattern, unsigned *found_offset, unsigned char *found_needle)
2859 | {
2860 | unsigned limit = 0;
2861 | int exception;
2862 |
2863 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2863, "tvb && tvb->initialized" ))));
2864 |
2865 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2866 | if (exception)
2867 | THROW(exception)except_throw(1, (exception), ((void*)0));
2868 |
2869 | /* Only search to end of tvbuff, w/o throwing exception. */
2870 | if (limit > maxlength) {
2871 | /* Maximum length doesn't go past end of tvbuff; search
2872 | to that value. */
2873 | limit = maxlength;
2874 | }
2875 |
2876 | return _tvb_ws_mempbrk_uint8_length(tvb, offset, limit, pattern, found_offset, found_needle);
2877 | }
2878 |
2879 | /* Find size of stringz (NUL-terminated string) by looking for terminating
2880 | * NUL. The size of the string includes the terminating NUL.
2881 | *
2882 | * If the NUL isn't found, it throws the appropriate exception.
2883 | */
2884 | unsigned
2885 | tvb_strsize(tvbuff_t *tvb, const unsigned offset)
2886 | {
2887 | unsigned nul_offset;
2888 |
2889 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2889, "tvb && tvb->initialized" ))));
2890 |
2891 | validate_offset(tvb, offset);
2892 | if (!tvb_find_uint8_remaining(tvb, offset, 0, &nul_offset)) {
2893 | /*
2894 | * OK, we hit the end of the tvbuff, so we should throw
2895 | * an exception.
2896 | */
2897 | if (tvb->length < tvb->contained_length) {
2898 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
2899 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
2900 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
2901 | } else if (tvb->length < tvb->reported_length) {
2902 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
2903 | } else {
2904 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2905 | }
2906 | }
2907 | return (nul_offset - offset) + 1;
2908 | }
2909 |
2910 | /* UTF-16/UCS-2 version of tvb_strsize */
2911 | /* Returns number of bytes including the (two-bytes) null terminator */
2912 | unsigned
2913 | tvb_unicode_strsize(tvbuff_t *tvb, const unsigned offset)
2914 | {
2915 | unsigned cur_offset = offset;
2916 | gunichar2 uchar;
2917 |
2918 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2918, "tvb && tvb->initialized" ))));
2919 |
2920 | /* Note: don't use tvb_find_uint16 because it must be aligned */
2921 | do {
2922 | /* Endianness doesn't matter when looking for null */
2923 | uchar = tvb_get_ntohs(tvb, cur_offset);
2924 | /* Make sure we don't overflow */
2925 | if (ckd_add(&cur_offset, cur_offset, 2)__builtin_add_overflow((cur_offset), (2), (&cur_offset))) {
2926 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2927 | }
2928 | } while(uchar != 0);
2929 |
2930 | return cur_offset - offset;
2931 | }
2932 |
2933 | /* UTF-32/UCS-4 version of tvb_strsize */
2934 | /* Returns number of bytes including the (four-bytes) null terminator */
2935 | static unsigned
2936 | tvb_ucs_4_strsize(tvbuff_t *tvb, const unsigned offset)
2937 | {
2938 |
2939 | unsigned end_offset;
2940 | gunichar uchar;
2941 |
2942 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2942, "tvb && tvb->initialized" ))));
2943 | end_offset = offset;
2944 | do {
2945 | /* Endianness doesn't matter when looking for null */
2946 | uchar = tvb_get_ntohl(tvb, end_offset);
2947 | /* Make sure we don't overflow */
2948 | if (ckd_add(&end_offset, end_offset, 4)__builtin_add_overflow((end_offset), (4), (&end_offset))) {
2949 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2950 | }
2951 | } while(uchar != 0);
2952 | return end_offset - offset;
2953 | }
2954 |
2955 | unsigned
2956 | tvb_strsize_enc(tvbuff_t *tvb, const unsigned offset, const unsigned encoding)
2957 | {
2958 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
2959 | case ENC_UTF_160x00000004:
2960 | case ENC_UCS_20x00000006:
2961 | return tvb_unicode_strsize(tvb, offset);
2962 |
2963 | case ENC_UCS_40x00000008:
2964 | return tvb_ucs_4_strsize(tvb, offset);
2965 |
2966 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
2967 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
2968 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
2969 | 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" );
2970 | break;
2971 |
2972 | case ENC_ASCII_7BITS0x00000034:
2973 | 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" );
2974 | break;
2975 |
2976 | case ENC_APN_STR0x00000054:
2977 | /* At least as defined in 3GPP TS 23.003 Clause 9.1, null-termination
2978 | * does make sense as internal nulls are not allowed. */
2979 | 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" );
2980 | break;
2981 |
2982 | case ENC_BCD_DIGITS_0_90x00000044:
2983 | case ENC_KEYPAD_ABC_TBCD0x00000046:
2984 | case ENC_KEYPAD_BC_TBCD0x00000048:
2985 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
2986 | 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." );
2987 | break;
2988 |
2989 | case ENC_ASCII0x00000000:
2990 | case ENC_UTF_80x00000002:
2991 | case ENC_ISO_8859_10x0000000A:
2992 | case ENC_ISO_8859_20x0000000C:
2993 | case ENC_ISO_8859_30x0000000E:
2994 | case ENC_ISO_8859_40x00000010:
2995 | case ENC_ISO_8859_50x00000012:
2996 | case ENC_ISO_8859_60x00000014:
2997 | case ENC_ISO_8859_70x00000016:
2998 | case ENC_ISO_8859_80x00000018:
2999 | case ENC_ISO_8859_90x0000001A:
3000 | case ENC_ISO_8859_100x0000001C:
3001 | case ENC_ISO_8859_110x0000001E:
3002 | case ENC_ISO_8859_130x00000022:
3003 | case ENC_ISO_8859_140x00000024:
3004 | case ENC_ISO_8859_150x00000026:
3005 | case ENC_ISO_8859_160x00000028:
3006 | case ENC_WINDOWS_12500x0000002A:
3007 | case ENC_WINDOWS_12510x0000003C:
3008 | case ENC_WINDOWS_12520x0000003A:
3009 | case ENC_MAC_ROMAN0x00000030:
3010 | case ENC_CP4370x00000032:
3011 | case ENC_CP8550x0000003E:
3012 | case ENC_CP8660x00000040:
3013 | case ENC_ISO_646_BASIC0x00000042:
3014 | case ENC_EBCDIC0x0000002E:
3015 | case ENC_EBCDIC_CP0370x00000038:
3016 | case ENC_EBCDIC_CP5000x00000060:
3017 | case ENC_T610x00000036:
3018 | case ENC_GB180300x00000050:
3019 | case ENC_EUC_KR0x00000052:
3020 | case ENC_DECT_STANDARD_8BITS0x00000056:
3021 | default:
3022 | return tvb_strsize(tvb, offset);
3023 | }
3024 | }
3025 |
3026 | /* Find length of string by looking for end of string ('\0'), up to
3027 | * 'maxlength' characters'; if 'maxlength' is -1, searches to end
3028 | * of tvbuff.
3029 | * Returns -1 if 'maxlength' reached before finding EOS. */
3030 | int
3031 | tvb_strnlen(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength)
3032 | {
3033 | unsigned result_offset;
3034 |
3035 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3035, "tvb && tvb->initialized" ))));
3036 |
3037 | /* TODO - this needs a variant that returns a bool
3038 | * and sets a unsigned offset to the value if true. */
3039 | if (!tvb_find_uint8_length(tvb, offset, maxlength, 0, &result_offset)) {
3040 | return -1;
3041 | }
3042 | else {
3043 | return (int)(result_offset - offset);
3044 | }
3045 | }
3046 |
3047 | /*
3048 | * Implement strneql etc
3049 | */
3050 |
3051 | /*
3052 | * Call strncmp after checking if enough chars left, returning 0 if
3053 | * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
3054 | */
3055 | int
3056 | tvb_strneql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
3057 | {
3058 | const uint8_t *ptr;
3059 |
3060 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3061 |
3062 | if (ptr) {
3063 | int cmp = strncmp((const char *)ptr, str, size);
3064 |
3065 | /*
3066 | * Return 0 if equal, -1 otherwise.
3067 | */
3068 | return (cmp == 0 ? 0 : -1);
3069 | } else {
3070 | /*
3071 | * Not enough characters in the tvbuff to match the
3072 | * string.
3073 | */
3074 | return -1;
3075 | }
3076 | }
3077 |
3078 | /*
3079 | * Call g_ascii_strncasecmp after checking if enough chars left, returning
3080 | * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
3081 | */
3082 | int
3083 | tvb_strncaseeql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
3084 | {
3085 | const uint8_t *ptr;
3086 |
3087 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3088 |
3089 | if (ptr) {
3090 | int cmp = g_ascii_strncasecmp((const char *)ptr, str, size);
3091 |
3092 | /*
3093 | * Return 0 if equal, -1 otherwise.
3094 | */
3095 | return (cmp == 0 ? 0 : -1);
3096 | } else {
3097 | /*
3098 | * Not enough characters in the tvbuff to match the
3099 | * string.
3100 | */
3101 | return -1;
3102 | }
3103 | }
3104 |
3105 | /*
3106 | * Check that the tvbuff contains at least size bytes, starting at
3107 | * offset, and that those bytes are equal to str. Return 0 for success
3108 | * and -1 for error. This function does not throw an exception.
3109 | */
3110 | int
3111 | tvb_memeql(tvbuff_t *tvb, const unsigned offset, const uint8_t *str, size_t size)
3112 | {
3113 | const uint8_t *ptr;
3114 |
3115 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
3116 |
3117 | if (ptr) {
3118 | int cmp = memcmp(ptr, str, size);
3119 |
3120 | /*
3121 | * Return 0 if equal, -1 otherwise.
3122 | */
3123 | return (cmp == 0 ? 0 : -1);
3124 | } else {
3125 | /*
3126 | * Not enough characters in the tvbuff to match the
3127 | * string.
3128 | */
3129 | return -1;
3130 | }
3131 | }
3132 |
3133 | /**
3134 | * Format the data in the tvb from offset for size.
3135 | */
3136 | char *
3137 | tvb_format_text(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3138 | {
3139 | const uint8_t *ptr;
3140 |
3141 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3142 | return format_text(scope, (const char*)ptr, size);
3143 | }
3144 |
3145 | /*
3146 | * Format the data in the tvb from offset for length ...
3147 | */
3148 | char *
3149 | tvb_format_text_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3150 | {
3151 | const uint8_t *ptr;
3152 |
3153 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3154 | return format_text_wsp(allocator, (const char*)ptr, size);
3155 | }
3156 |
3157 | /**
3158 | * Like "tvb_format_text()", but for null-padded strings; don't show
3159 | * the null padding characters as "\000".
3160 | */
3161 | char *
3162 | tvb_format_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3163 | {
3164 | const uint8_t *ptr, *p;
3165 | unsigned stringlen;
3166 |
3167 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3168 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
3169 | ;
3170 | return format_text(scope, (const char*)ptr, stringlen);
3171 | }
3172 |
3173 | /*
3174 | * Like "tvb_format_text_wsp()", but for null-padded strings; don't show
3175 | * the null padding characters as "\000".
3176 | */
3177 | char *
3178 | tvb_format_stringzpad_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
3179 | {
3180 | const uint8_t *ptr, *p;
3181 | unsigned stringlen;
3182 |
3183 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3184 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
3185 | ;
3186 | return format_text_wsp(allocator, (const char*)ptr, stringlen);
3187 | }
3188 |
3189 | /*
3190 | * All string functions below take a scope as an argument.
3191 | *
3192 | *
3193 | * If scope is NULL, memory is allocated with g_malloc() and user must
3194 | * explicitly free it with g_free().
3195 | * If scope is not NULL, memory is allocated with the corresponding pool
3196 | * lifetime.
3197 | *
3198 | * All functions throw an exception if the tvbuff ends before the string
3199 | * does.
3200 | */
3201 |
3202 | /*
3203 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3204 | * of bytes referred to by the tvbuff, offset, and length as an ASCII string,
3205 | * with all bytes with the high-order bit set being invalid, and return a
3206 | * pointer to a UTF-8 string, allocated using the wmem scope.
3207 | *
3208 | * Octets with the highest bit set will be converted to the Unicode
3209 | * REPLACEMENT CHARACTER.
3210 | */
3211 | static uint8_t *
3212 | tvb_get_ascii_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3213 | {
3214 | const uint8_t *ptr;
3215 |
3216 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3217 | return get_ascii_string(scope, ptr, length);
3218 | }
3219 |
3220 | /*
3221 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation table,
3222 | * treat the string of bytes referred to by the tvbuff, offset, and length
3223 | * as a string encoded using one octet per character, with octets with the
3224 | * high-order bit clear being mapped by the translation table to 2-byte
3225 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
3226 | * CHARACTER) and octets with the high-order bit set being mapped to
3227 | * REPLACEMENT CHARACTER, and return a pointer to a UTF-8 string,
3228 | * allocated using the wmem scope.
3229 | *
3230 | * Octets with the highest bit set will be converted to the Unicode
3231 | * REPLACEMENT CHARACTER.
3232 | */
3233 | static uint8_t *
3234 | tvb_get_iso_646_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
3235 | {
3236 | const uint8_t *ptr;
3237 |
3238 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3239 | return get_iso_646_string(scope, ptr, length, table);
3240 | }
3241 |
3242 | /*
3243 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3244 | * of bytes referred to by the tvbuff, the offset. and the length as a UTF-8
3245 | * string, and return a pointer to a UTF-8 string, allocated using the wmem
3246 | * scope, with all ill-formed sequences replaced with the Unicode REPLACEMENT
3247 | * CHARACTER according to the recommended "best practices" given in the Unicode
3248 | * Standard and specified by W3C/WHATWG.
3249 | *
3250 | * Note that in conformance with the Unicode Standard, this treats three
3251 | * byte sequences corresponding to UTF-16 surrogate halves (paired or unpaired)
3252 | * and two byte overlong encodings of 7-bit ASCII characters as invalid and
3253 | * substitutes REPLACEMENT CHARACTER for them. Explicit support for nonstandard
3254 | * derivative encoding formats (e.g. CESU-8, Java Modified UTF-8, WTF-8) could
3255 | * be added later.
3256 | */
3257 | static uint8_t *
3258 | tvb_get_utf_8_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length)
3259 | {
3260 | const uint8_t *ptr;
3261 |
3262 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3263 | return get_utf_8_string(scope, ptr, length);
3264 | }
3265 |
3266 | /*
3267 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3268 | * of bytes referred to by the tvbuff, the offset, and the length as a
3269 | * raw string, and return a pointer to that string, allocated using the
3270 | * wmem scope. This means a null is appended at the end, but no replacement
3271 | * checking is done otherwise, unlike tvb_get_utf_8_string().
3272 | */
3273 | static inline uint8_t *
3274 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length)
3275 | {
3276 | uint8_t *strbuf;
3277 |
3278 | tvb_ensure_bytes_exist(tvb, offset, length);
3279 | strbuf = (uint8_t *)wmem_alloc(scope, length + 1);
3280 | tvb_memcpy(tvb, strbuf, offset, length);
3281 | strbuf[length] = '\0';
3282 | return strbuf;
3283 | }
3284 |
3285 | /*
3286 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3287 | * of bytes referred to by the tvbuff, the offset, and the length as an
3288 | * ISO 8859/1 string, and return a pointer to a UTF-8 string, allocated
3289 | * using the wmem scope.
3290 | */
3291 | static uint8_t *
3292 | tvb_get_string_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3293 | {
3294 | const uint8_t *ptr;
3295 |
3296 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3297 | return get_8859_1_string(scope, ptr, length);
3298 | }
3299 |
3300 | /*
3301 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3302 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3303 | * and the length as a string encoded using one octet per character, with
3304 | * octets with the high-order bit clear being ASCII and octets with the
3305 | * high-order bit set being mapped by the translation table to 2-byte
3306 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
3307 | * CHARACTER), and return a pointer to a UTF-8 string, allocated with the
3308 | * wmem scope.
3309 | */
3310 | static uint8_t *
3311 | tvb_get_string_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
3312 | {
3313 | const uint8_t *ptr;
3314 |
3315 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3316 | return get_unichar2_string(scope, ptr, length, table);
3317 | }
3318 |
3319 | /*
3320 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3321 | * giving the byte order, treat the string of bytes referred to by the
3322 | * tvbuff, the offset, and the length as a UCS-2 encoded string in
3323 | * the byte order in question, containing characters from the Basic
3324 | * Multilingual Plane (plane 0) of Unicode, and return a pointer to a
3325 | * UTF-8 string, allocated with the wmem scope.
3326 | *
3327 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3328 | * optionally with ENC_BOM.
3329 | *
3330 | * Specify length in bytes.
3331 | *
3332 | * XXX - should map lead and trail surrogate values to REPLACEMENT
3333 | * CHARACTERs (0xFFFD)?
3334 | * XXX - if there are an odd number of bytes, should put a
3335 | * REPLACEMENT CHARACTER at the end.
3336 | */
3337 | static uint8_t *
3338 | tvb_get_ucs_2_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3339 | {
3340 | const uint8_t *ptr;
3341 |
3342 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3343 | return get_ucs_2_string(scope, ptr, length, encoding);
3344 | }
3345 |
3346 | /*
3347 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3348 | * giving the byte order, treat the string of bytes referred to by the
3349 | * tvbuff, the offset, and the length as a UTF-16 encoded string in
3350 | * the byte order in question, and return a pointer to a UTF-8 string,
3351 | * allocated with the wmem scope.
3352 | *
3353 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3354 | * optionally with ENC_BOM.
3355 | *
3356 | * Specify length in bytes.
3357 | *
3358 | * XXX - should map surrogate errors to REPLACEMENT CHARACTERs (0xFFFD).
3359 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3360 | * XXX - if there are an odd number of bytes, should put a
3361 | * REPLACEMENT CHARACTER at the end.
3362 | */
3363 | static uint8_t *
3364 | tvb_get_utf_16_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3365 | {
3366 | const uint8_t *ptr;
3367 |
3368 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3369 | return get_utf_16_string(scope, ptr, length, encoding);
3370 | }
3371 |
3372 | /*
3373 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3374 | * giving the byte order, treat the string of bytes referred to by the
3375 | * tvbuff, the offset, and the length as a UCS-4 encoded string in
3376 | * the byte order in question, and return a pointer to a UTF-8 string,
3377 | * allocated with the wmem scope.
3378 | *
3379 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3380 | * optionally with ENC_BOM.
3381 | *
3382 | * Specify length in bytes
3383 | *
3384 | * XXX - should map lead and trail surrogate values to a "substitute"
3385 | * UTF-8 character?
3386 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3387 | * XXX - if the number of bytes isn't a multiple of 4, should put a
3388 | * REPLACEMENT CHARACTER at the end.
3389 | */
3390 | static char *
3391 | tvb_get_ucs_4_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3392 | {
3393 | const uint8_t *ptr;
3394 |
3395 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3396 | return (char*)get_ucs_4_string(scope, ptr, length, encoding);
3397 | }
3398 |
3399 | char *
3400 | tvb_get_ts_23_038_7bits_string_packed(wmem_allocator_t *scope, tvbuff_t *tvb,
3401 | const unsigned bit_offset, unsigned no_of_chars)
3402 | {
3403 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3404 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3405 | const uint8_t *ptr;
3406 |
3407 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3407, "tvb && tvb->initialized" ))));
3408 |
3409 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3410 | return (char*)get_ts_23_038_7bits_string_packed(scope, ptr, bit_offset, no_of_chars);
3411 | }
3412 |
3413 | char *
3414 | tvb_get_ts_23_038_7bits_string_unpacked(wmem_allocator_t *scope, tvbuff_t *tvb,
3415 | const unsigned offset, unsigned length)
3416 | {
3417 | const uint8_t *ptr;
3418 |
3419 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3419, "tvb && tvb->initialized" ))));
3420 |
3421 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3422 | return (char*)get_ts_23_038_7bits_string_unpacked(scope, ptr, length);
3423 | }
3424 |
3425 | char *
3426 | tvb_get_etsi_ts_102_221_annex_a_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3427 | const unsigned offset, unsigned length)
3428 | {
3429 | const uint8_t *ptr;
3430 |
3431 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3431, "tvb && tvb->initialized" ))));
3432 |
3433 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3434 | return (char*)get_etsi_ts_102_221_annex_a_string(scope, ptr, length);
3435 | }
3436 |
3437 | char *
3438 | tvb_get_ascii_7bits_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3439 | const unsigned bit_offset, unsigned no_of_chars)
3440 | {
3441 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3442 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3443 | const uint8_t *ptr;
3444 |
3445 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3445, "tvb && tvb->initialized" ))));
3446 |
3447 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3448 | return (char*)get_ascii_7bits_string(scope, ptr, bit_offset, no_of_chars);
3449 | }
3450 |
3451 | /*
3452 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3453 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3454 | * and the length as a string encoded using one octet per character, with
3455 | * octets being mapped by the translation table to 2-byte Unicode Basic
3456 | * Multilingual Plane characters (including REPLACEMENT CHARACTER), and
3457 | * return a pointer to a UTF-8 string, allocated with the wmem scope.
3458 | */
3459 | static uint8_t *
3460 | tvb_get_nonascii_unichar2_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[256])
3461 | {
3462 | const uint8_t *ptr;
3463 |
3464 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3465 | return get_nonascii_unichar2_string(scope, ptr, length, table);
3466 | }
3467 |
3468 | /*
3469 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3470 | * referred to by the tvbuff, offset, and length as a GB18030 encoded string,
3471 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3472 | * converted having substituted REPLACEMENT CHARACTER according to the
3473 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3474 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3475 | *
3476 | * As expected, this will also decode GBK and GB2312 strings.
3477 | */
3478 | static uint8_t *
3479 | tvb_get_gb18030_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3480 | {
3481 | const uint8_t *ptr;
3482 |
3483 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3484 | return get_gb18030_string(scope, ptr, length);
3485 | }
3486 |
3487 | /*
3488 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3489 | * referred to by the tvbuff, offset, and length as a EUC-KR encoded string,
3490 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3491 | * converted having substituted REPLACEMENT CHARACTER according to the
3492 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3493 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3494 | */
3495 | static uint8_t *
3496 | tvb_get_euc_kr_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3497 | {
3498 | const uint8_t *ptr;
3499 |
3500 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3501 | return get_euc_kr_string(scope, ptr, length);
3502 | }
3503 |
3504 | static uint8_t *
3505 | tvb_get_t61_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3506 | {
3507 | const uint8_t *ptr;
3508 |
3509 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3510 | return get_t61_string(scope, ptr, length);
3511 | }
3512 |
3513 | /*
3514 | * Encoding tables for BCD strings.
3515 | */
3516 | static const dgt_set_t Dgt0_9_bcd = {
3517 | {
3518 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3519 | '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?','?'
3520 | }
3521 | };
3522 |
3523 | static const dgt_set_t Dgt_keypad_abc_tbcd = {
3524 | {
3525 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3526 | '0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?'
3527 | }
3528 | };
3529 |
3530 | static const dgt_set_t Dgt_ansi_tbcd = {
3531 | {
3532 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3533 | '0','1','2','3','4','5','6','7','8','9','?','B','C','*','#','?'
3534 | }
3535 | };
3536 |
3537 | static const dgt_set_t Dgt_dect_standard_4bits_tbcd = {
3538 | {
3539 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3540 | '0','1','2','3','4','5','6','7','8','9','?',' ','?','?','?','?'
3541 | }
3542 | };
3543 |
3544 | static uint8_t *
3545 | tvb_get_apn_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3546 | unsigned length)
3547 | {
3548 | wmem_strbuf_t *str;
3549 |
3550 | /*
3551 | * This is a domain name.
3552 | *
3553 | * 3GPP TS 23.003, section 19.4.2 "Fully Qualified Domain Names
3554 | * (FQDNs)", subsection 19.4.2.1 "General", says:
3555 | *
3556 | * The encoding of any identifier used as part of a Fully
3557 | * Qualified Domain Name (FQDN) shall follow the Name Syntax
3558 | * defined in IETF RFC 2181 [18], IETF RFC 1035 [19] and
3559 | * IETF RFC 1123 [20]. An FQDN consists of one or more
3560 | * labels. Each label is coded as a one octet length field
3561 | * followed by that number of octets coded as 8 bit ASCII
3562 | * characters.
3563 | *
3564 | * so this does not appear to use full-blown DNS compression -
3565 | * the upper 2 bits of the length don't indicate that it's a
3566 | * pointer or an extended label (RFC 2673).
3567 | */
3568 | str = wmem_strbuf_new_sized(scope, length + 1);
3569 | if (length > 0) {
3570 | const uint8_t *ptr;
3571 |
3572 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3573 |
3574 | for (;;) {
3575 | unsigned label_len;
3576 |
3577 | /*
3578 | * Process this label.
3579 | */
3580 | label_len = *ptr;
3581 | ptr++;
3582 | length--;
3583 |
3584 | while (label_len != 0) {
3585 | uint8_t ch;
3586 |
3587 | if (length == 0)
3588 | goto end;
3589 |
3590 | ch = *ptr;
3591 | if (ch < 0x80)
3592 | wmem_strbuf_append_c(str, ch);
3593 | else
3594 | wmem_strbuf_append_unichar_repl(str)wmem_strbuf_append_unichar(str, 0x00FFFD);
3595 | ptr++;
3596 | label_len--;
3597 | length--;
3598 | }
3599 |
3600 | if (length == 0)
3601 | goto end;
3602 |
3603 | wmem_strbuf_append_c(str, '.');
3604 | }
3605 | }
3606 |
3607 | end:
3608 | return (uint8_t *) wmem_strbuf_finalize(str);
3609 | }
3610 |
3611 | static uint8_t *
3612 | tvb_get_dect_standard_8bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3613 | {
3614 | const uint8_t *ptr;
3615 |
3616 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3617 | return get_dect_standard_8bits_string(scope, ptr, length);
3618 | }
3619 |
3620 | /*
3621 | * Given a tvbuff, an offset, a length, and an encoding, allocate a
3622 | * buffer big enough to hold a non-null-terminated string of that length
3623 | * at that offset, plus a trailing '\0', copy into the buffer the
3624 | * string as converted from the appropriate encoding to UTF-8, and
3625 | * return a pointer to the string.
3626 | */
3627 | uint8_t *
3628 | tvb_get_string_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3629 | const unsigned length, const unsigned encoding)
3630 | {
3631 | uint8_t *strptr;
3632 | bool_Bool odd, skip_first;
3633 |
3634 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3634, "tvb && tvb->initialized" ))));
3635 |
3636 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3637 |
3638 | case ENC_ASCII0x00000000:
3639 | default:
3640 | /*
3641 | * For now, we treat bogus values as meaning
3642 | * "ASCII" rather than reporting an error,
3643 | * for the benefit of old dissectors written
3644 | * when the last argument to proto_tree_add_item()
3645 | * was a bool for the byte order, not an
3646 | * encoding value, and passed non-zero values
3647 | * other than true to mean "little-endian".
3648 | */
3649 | strptr = tvb_get_ascii_string(scope, tvb, offset, length);
3650 | break;
3651 |
3652 | case ENC_UTF_80x00000002:
3653 | strptr = tvb_get_utf_8_string(scope, tvb, offset, length);
3654 | break;
3655 |
3656 | case ENC_UTF_160x00000004:
3657 | strptr = tvb_get_utf_16_string(scope, tvb, offset, length,
3658 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3659 | break;
3660 |
3661 | case ENC_UCS_20x00000006:
3662 | strptr = tvb_get_ucs_2_string(scope, tvb, offset, length,
3663 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3664 | break;
3665 |
3666 | case ENC_UCS_40x00000008:
3667 | strptr = (uint8_t*)tvb_get_ucs_4_string(scope, tvb, offset, length,
3668 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3669 | break;
3670 |
3671 | case ENC_ISO_8859_10x0000000A:
3672 | /*
3673 | * ISO 8859-1 printable code point values are equal
3674 | * to the equivalent Unicode code point value, so
3675 | * no translation table is needed.
3676 | */
3677 | strptr = tvb_get_string_8859_1(scope, tvb, offset, length);
3678 | break;
3679 |
3680 | case ENC_ISO_8859_20x0000000C:
3681 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_2);
3682 | break;
3683 |
3684 | case ENC_ISO_8859_30x0000000E:
3685 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_3);
3686 | break;
3687 |
3688 | case ENC_ISO_8859_40x00000010:
3689 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_4);
3690 | break;
3691 |
3692 | case ENC_ISO_8859_50x00000012:
3693 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_5);
3694 | break;
3695 |
3696 | case ENC_ISO_8859_60x00000014:
3697 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_6);
3698 | break;
3699 |
3700 | case ENC_ISO_8859_70x00000016:
3701 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_7);
3702 | break;
3703 |
3704 | case ENC_ISO_8859_80x00000018:
3705 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_8);
3706 | break;
3707 |
3708 | case ENC_ISO_8859_90x0000001A:
3709 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_9);
3710 | break;
3711 |
3712 | case ENC_ISO_8859_100x0000001C:
3713 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_10);
3714 | break;
3715 |
3716 | case ENC_ISO_8859_110x0000001E:
3717 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_11);
3718 | break;
3719 |
3720 | case ENC_ISO_8859_130x00000022:
3721 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_13);
3722 | break;
3723 |
3724 | case ENC_ISO_8859_140x00000024:
3725 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_14);
3726 | break;
3727 |
3728 | case ENC_ISO_8859_150x00000026:
3729 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_15);
3730 | break;
3731 |
3732 | case ENC_ISO_8859_160x00000028:
3733 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_16);
3734 | break;
3735 |
3736 | case ENC_WINDOWS_12500x0000002A:
3737 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1250);
3738 | break;
3739 |
3740 | case ENC_WINDOWS_12510x0000003C:
3741 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1251);
3742 | break;
3743 |
3744 | case ENC_WINDOWS_12520x0000003A:
3745 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1252);
3746 | break;
3747 |
3748 | case ENC_MAC_ROMAN0x00000030:
3749 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_mac_roman);
3750 | break;
3751 |
3752 | case ENC_CP4370x00000032:
3753 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp437);
3754 | break;
3755 |
3756 | case ENC_CP8550x0000003E:
3757 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp855);
3758 | break;
3759 |
3760 | case ENC_CP8660x00000040:
3761 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp866);
3762 | break;
3763 |
3764 | case ENC_ISO_646_BASIC0x00000042:
3765 | strptr = tvb_get_iso_646_string(scope, tvb, offset, length, charset_table_iso_646_basic);
3766 | break;
3767 |
3768 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3769 | {
3770 | unsigned bit_offset = offset << 3;
3771 | unsigned no_of_chars = (length << 3) / 7;
3772 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_packed(scope, tvb, bit_offset, no_of_chars);
3773 | }
3774 | break;
3775 |
3776 | case ENC_ASCII_7BITS0x00000034:
3777 | {
3778 | unsigned bit_offset = offset << 3;
3779 | unsigned no_of_chars = (length << 3) / 7;
3780 | strptr = (uint8_t*)tvb_get_ascii_7bits_string(scope, tvb, bit_offset, no_of_chars);
3781 | }
3782 | break;
3783 |
3784 | case ENC_EBCDIC0x0000002E:
3785 | /*
3786 | * "Common" EBCDIC, covering all characters with the
3787 | * same code point in all Roman-alphabet EBCDIC code
3788 | * pages.
3789 | */
3790 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic);
3791 | break;
3792 |
3793 | case ENC_EBCDIC_CP0370x00000038:
3794 | /*
3795 | * EBCDIC code page 037.
3796 | */
3797 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp037);
3798 | break;
3799 |
3800 | case ENC_EBCDIC_CP5000x00000060:
3801 | /*
3802 | * EBCDIC code page 500.
3803 | */
3804 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp500);
3805 | break;
3806 |
3807 | case ENC_T610x00000036:
3808 | strptr = tvb_get_t61_string(scope, tvb, offset, length);
3809 | break;
3810 |
3811 | case ENC_BCD_DIGITS_0_90x00000044:
3812 | /*
3813 | * Packed BCD, with digits 0-9.
3814 | */
3815 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3816 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3817 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt0_9_bcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3818 | break;
3819 |
3820 | case ENC_KEYPAD_ABC_TBCD0x00000046:
3821 | /*
3822 | * Keypad-with-a/b/c "telephony BCD" - packed BCD, with
3823 | * digits 0-9 and symbols *, #, a, b, and c.
3824 | */
3825 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3826 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3827 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_keypad_abc_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3828 | break;
3829 |
3830 | case ENC_KEYPAD_BC_TBCD0x00000048:
3831 | /*
3832 | * Keypad-with-B/C "telephony BCD" - packed BCD, with
3833 | * digits 0-9 and symbols B, C, *, and #.
3834 | */
3835 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3836 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3837 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_ansi_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3838 | break;
3839 |
3840 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3841 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_unpacked(scope, tvb, offset, length);
3842 | break;
3843 |
3844 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3845 | strptr = (uint8_t*)tvb_get_etsi_ts_102_221_annex_a_string(scope, tvb, offset, length);
3846 | break;
3847 |
3848 | case ENC_GB180300x00000050:
3849 | strptr = tvb_get_gb18030_string(scope, tvb, offset, length);
3850 | break;
3851 |
3852 | case ENC_EUC_KR0x00000052:
3853 | strptr = tvb_get_euc_kr_string(scope, tvb, offset, length);
3854 | break;
3855 |
3856 | case ENC_APN_STR0x00000054:
3857 | strptr = tvb_get_apn_string(scope, tvb, offset, length);
3858 | break;
3859 |
3860 | case ENC_DECT_STANDARD_8BITS0x00000056:
3861 | strptr = tvb_get_dect_standard_8bits_string(scope, tvb, offset, length);
3862 | break;
3863 |
3864 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
3865 | /*
3866 | * DECT standard 4bits "telephony BCD" - packed BCD, with
3867 | * digits 0-9 and symbol SPACE for 0xb.
3868 | */
3869 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3870 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3871 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_dect_standard_4bits_tbcd, skip_first, odd, false0);
3872 | break;
3873 | }
3874 | return strptr;
3875 | }
3876 |
3877 | /*
3878 | * This is like tvb_get_string_enc(), except that it handles null-padded
3879 | * strings.
3880 | *
3881 | * Currently, string values are stored as UTF-8 null-terminated strings,
3882 | * so nothing needs to be done differently for null-padded strings; we
3883 | * could save a little memory by not storing the null padding.
3884 | *
3885 | * If we ever store string values differently, in a fashion that doesn't
3886 | * involve null termination, that might change.
3887 | */
3888 | uint8_t *
3889 | tvb_get_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3890 | const unsigned length, const unsigned encoding)
3891 | {
3892 | return tvb_get_string_enc(scope, tvb, offset, length, encoding);
3893 | }
3894 |
3895 | /*
3896 | * These routines are like the above routines, except that they handle
3897 | * null-terminated strings. They find the length of that string (and
3898 | * throw an exception if the tvbuff ends before we find the null), and
3899 | * also return through a pointer the length of the string, in bytes,
3900 | * including the terminating null (the terminating null being 2 bytes
3901 | * for UCS-2 and UTF-16, 4 bytes for UCS-4, and 1 byte for other
3902 | * encodings).
3903 | */
3904 | static uint8_t *
3905 | tvb_get_ascii_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3906 | {
3907 | unsigned size;
3908 | const uint8_t *ptr;
3909 |
3910 | size = tvb_strsize(tvb, offset);
3911 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3912 | if (lengthp)
3913 | *lengthp = size;
3914 | return get_ascii_string(scope, ptr, size);
3915 | }
3916 |
3917 | static uint8_t *
3918 | tvb_get_iso_646_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
3919 | {
3920 | unsigned size;
3921 | const uint8_t *ptr;
3922 |
3923 | size = tvb_strsize(tvb, offset);
3924 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3925 | if (lengthp)
3926 | *lengthp = size;
3927 | return get_iso_646_string(scope, ptr, size, table);
3928 | }
3929 |
3930 | static uint8_t *
3931 | tvb_get_utf_8_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3932 | {
3933 | unsigned size;
3934 | const uint8_t *ptr;
3935 |
3936 | size = tvb_strsize(tvb, offset);
3937 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3938 | if (lengthp)
3939 | *lengthp = size;
3940 | return get_utf_8_string(scope, ptr, size);
3941 | }
3942 |
3943 | static uint8_t *
3944 | tvb_get_stringz_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3945 | {
3946 | unsigned size;
3947 | const uint8_t *ptr;
3948 |
3949 | size = tvb_strsize(tvb, offset);
3950 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3951 | if (lengthp)
3952 | *lengthp = size;
3953 | return get_8859_1_string(scope, ptr, size);
3954 | }
3955 |
3956 | static uint8_t *
3957 | tvb_get_stringz_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
3958 | {
3959 | unsigned size;
3960 | const uint8_t *ptr;
3961 |
3962 | size = tvb_strsize(tvb, offset);
3963 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3964 | if (lengthp)
3965 | *lengthp = size;
3966 | return get_unichar2_string(scope, ptr, size, table);
3967 | }
3968 |
3969 | /*
3970 | * Given a tvbuff and an offset, with the offset assumed to refer to
3971 | * a null-terminated string, find the length of that string (and throw
3972 | * an exception if the tvbuff ends before we find the null), ensure that
3973 | * the TVB is flat, and return a pointer to the string (in the TVB).
3974 | * Also return the length of the string (including the terminating null)
3975 | * through a pointer.
3976 | *
3977 | * As long as we aren't using composite TVBs, this saves the cycles used
3978 | * (often unnecessarily) in allocating a buffer and copying the string into
3979 | * it. OTOH, the string returned isn't valid UTF-8, so it shouldn't be
3980 | * added to the tree, the columns, etc., just used with various other
3981 | * functions that operate on strings that don't have a tvb_ equivalent.
3982 | * That's hard to enforce, which is why this is deprecated.
3983 | */
3984 | const uint8_t *
3985 | tvb_get_const_stringz(tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3986 | {
3987 | unsigned size;
3988 | const uint8_t *strptr;
3989 |
3990 | size = tvb_strsize(tvb, offset);
3991 | strptr = ensure_contiguous_unsigned(tvb, offset, size);
3992 | if (lengthp)
3993 | *lengthp = size;
3994 | return strptr;
3995 | }
3996 |
3997 | static char *
3998 | tvb_get_ucs_2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
3999 | {
4000 | unsigned size; /* Number of bytes in string */
4001 | const uint8_t *ptr;
4002 |
4003 | size = tvb_unicode_strsize(tvb, offset);
4004 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4005 | if (lengthp)
4006 | *lengthp = size;
4007 | return (char*)get_ucs_2_string(scope, ptr, size, encoding);
4008 | }
4009 |
4010 | static char *
4011 | tvb_get_utf_16_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4012 | {
4013 | unsigned size;
4014 | const uint8_t *ptr;
4015 |
4016 | size = tvb_unicode_strsize(tvb, offset);
4017 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4018 | if (lengthp)
4019 | *lengthp = size;
4020 | return (char*)get_utf_16_string(scope, ptr, size, encoding);
4021 | }
4022 |
4023 | static char *
4024 | tvb_get_ucs_4_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4025 | {
4026 | unsigned size;
4027 | const uint8_t *ptr;
4028 |
4029 | size = tvb_ucs_4_strsize(tvb, offset);
4030 |
4031 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4032 | if (lengthp)
4033 | *lengthp = size;
4034 | return (char*)get_ucs_4_string(scope, ptr, size, encoding);
4035 | }
4036 |
4037 | static uint8_t *
4038 | tvb_get_nonascii_unichar2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[256])
4039 | {
4040 | unsigned size;
4041 | const uint8_t *ptr;
4042 |
4043 | size = tvb_strsize(tvb, offset);
4044 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4045 | if (lengthp)
4046 | *lengthp = size;
4047 | return get_nonascii_unichar2_string(scope, ptr, size, table);
4048 | }
4049 |
4050 | static uint8_t *
4051 | tvb_get_t61_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4052 | {
4053 | unsigned size;
4054 | const uint8_t *ptr;
4055 |
4056 | size = tvb_strsize(tvb, offset);
4057 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4058 | if (lengthp)
4059 | *lengthp = size;
4060 | return get_t61_string(scope, ptr, size);
4061 | }
4062 |
4063 | static uint8_t *
4064 | tvb_get_gb18030_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4065 | {
4066 | unsigned size;
4067 | const uint8_t *ptr;
4068 |
4069 | size = tvb_strsize(tvb, offset);
4070 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4071 | if (lengthp)
4072 | *lengthp = size;
4073 | return get_gb18030_string(scope, ptr, size);
4074 | }
4075 |
4076 | static uint8_t *
4077 | tvb_get_euc_kr_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4078 | {
4079 | unsigned size;
4080 | const uint8_t *ptr;
4081 |
4082 | size = tvb_strsize(tvb, offset);
4083 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4084 | if (lengthp)
4085 | *lengthp = size;
4086 | return get_euc_kr_string(scope, ptr, size);
4087 | }
4088 |
4089 | static uint8_t *
4090 | tvb_get_dect_standard_8bits_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
4091 | {
4092 | unsigned size;
4093 | const uint8_t *ptr;
4094 |
4095 | size = tvb_strsize(tvb, offset);
4096 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
4097 | if (lengthp)
4098 | *lengthp = size;
4099 | return get_dect_standard_8bits_string(scope, ptr, size);
4100 | }
4101 |
4102 | uint8_t *
4103 | tvb_get_stringz_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
4104 | {
4105 | uint8_t *strptr;
4106 |
4107 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4107, "tvb && tvb->initialized" ))));
4108 |
4109 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
4110 |
4111 | case ENC_ASCII0x00000000:
4112 | default:
4113 | /*
4114 | * For now, we treat bogus values as meaning
4115 | * "ASCII" rather than reporting an error,
4116 | * for the benefit of old dissectors written
4117 | * when the last argument to proto_tree_add_item()
4118 | * was a bool for the byte order, not an
4119 | * encoding value, and passed non-zero values
4120 | * other than true to mean "little-endian".
4121 | */
4122 | strptr = tvb_get_ascii_stringz(scope, tvb, offset, lengthp);
4123 | break;
4124 |
4125 | case ENC_UTF_80x00000002:
4126 | strptr = tvb_get_utf_8_stringz(scope, tvb, offset, lengthp);
4127 | break;
4128 |
4129 | case ENC_UTF_160x00000004:
4130 | strptr = (uint8_t*)tvb_get_utf_16_stringz(scope, tvb, offset, lengthp,
4131 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4132 | break;
4133 |
4134 | case ENC_UCS_20x00000006:
4135 | strptr = (uint8_t*)tvb_get_ucs_2_stringz(scope, tvb, offset, lengthp,
4136 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4137 | break;
4138 |
4139 | case ENC_UCS_40x00000008:
4140 | strptr = (uint8_t*)tvb_get_ucs_4_stringz(scope, tvb, offset, lengthp,
4141 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
4142 | break;
4143 |
4144 | case ENC_ISO_8859_10x0000000A:
4145 | /*
4146 | * ISO 8859-1 printable code point values are equal
4147 | * to the equivalent Unicode code point value, so
4148 | * no translation table is needed.
4149 | */
4150 | strptr = tvb_get_stringz_8859_1(scope, tvb, offset, lengthp);
4151 | break;
4152 |
4153 | case ENC_ISO_8859_20x0000000C:
4154 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_2);
4155 | break;
4156 |
4157 | case ENC_ISO_8859_30x0000000E:
4158 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_3);
4159 | break;
4160 |
4161 | case ENC_ISO_8859_40x00000010:
4162 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_4);
4163 | break;
4164 |
4165 | case ENC_ISO_8859_50x00000012:
4166 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_5);
4167 | break;
4168 |
4169 | case ENC_ISO_8859_60x00000014:
4170 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_6);
4171 | break;
4172 |
4173 | case ENC_ISO_8859_70x00000016:
4174 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_7);
4175 | break;
4176 |
4177 | case ENC_ISO_8859_80x00000018:
4178 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_8);
4179 | break;
4180 |
4181 | case ENC_ISO_8859_90x0000001A:
4182 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_9);
4183 | break;
4184 |
4185 | case ENC_ISO_8859_100x0000001C:
4186 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_10);
4187 | break;
4188 |
4189 | case ENC_ISO_8859_110x0000001E:
4190 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_11);
4191 | break;
4192 |
4193 | case ENC_ISO_8859_130x00000022:
4194 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_13);
4195 | break;
4196 |
4197 | case ENC_ISO_8859_140x00000024:
4198 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_14);
4199 | break;
4200 |
4201 | case ENC_ISO_8859_150x00000026:
4202 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_15);
4203 | break;
4204 |
4205 | case ENC_ISO_8859_160x00000028:
4206 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_16);
4207 | break;
4208 |
4209 | case ENC_WINDOWS_12500x0000002A:
4210 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1250);
4211 | break;
4212 |
4213 | case ENC_WINDOWS_12510x0000003C:
4214 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1251);
4215 | break;
4216 |
4217 | case ENC_WINDOWS_12520x0000003A:
4218 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1252);
4219 | break;
4220 |
4221 | case ENC_MAC_ROMAN0x00000030:
4222 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_mac_roman);
4223 | break;
4224 |
4225 | case ENC_CP4370x00000032:
4226 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp437);
4227 | break;
4228 |
4229 | case ENC_CP8550x0000003E:
4230 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp855);
4231 | break;
4232 |
4233 | case ENC_CP8660x00000040:
4234 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp866);
4235 | break;
4236 |
4237 | case ENC_ISO_646_BASIC0x00000042:
4238 | strptr = tvb_get_iso_646_stringz(scope, tvb, offset, lengthp, charset_table_iso_646_basic);
4239 | break;
4240 |
4241 | case ENC_BCD_DIGITS_0_90x00000044:
4242 | case ENC_KEYPAD_ABC_TBCD0x00000046:
4243 | case ENC_KEYPAD_BC_TBCD0x00000048:
4244 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
4245 | 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." );
4246 | break;
4247 |
4248 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
4249 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
4250 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
4251 | 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" );
4252 | break;
4253 |
4254 | case ENC_ASCII_7BITS0x00000034:
4255 | 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" );
4256 | break;
4257 |
4258 | case ENC_EBCDIC0x0000002E:
4259 | /*
4260 | * "Common" EBCDIC, covering all characters with the
4261 | * same code point in all Roman-alphabet EBCDIC code
4262 | * pages.
4263 | */
4264 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic);
4265 | break;
4266 |
4267 | case ENC_EBCDIC_CP0370x00000038:
4268 | /*
4269 | * EBCDIC code page 037.
4270 | */
4271 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp037);
4272 | break;
4273 |
4274 | case ENC_EBCDIC_CP5000x00000060:
4275 | /*
4276 | * EBCDIC code page 500.
4277 | */
4278 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp500);
4279 | break;
4280 |
4281 | case ENC_T610x00000036:
4282 | strptr = tvb_get_t61_stringz(scope, tvb, offset, lengthp);
4283 | break;
4284 |
4285 | case ENC_GB180300x00000050:
4286 | strptr = tvb_get_gb18030_stringz(scope, tvb, offset, lengthp);
4287 | break;
4288 |
4289 | case ENC_EUC_KR0x00000052:
4290 | strptr = tvb_get_euc_kr_stringz(scope, tvb, offset, lengthp);
4291 | break;
4292 |
4293 | case ENC_APN_STR0x00000054:
4294 | /* At least as defined in 3GPP TS 23.003 Clause 9.1, null-termination
4295 | * does make sense as internal nulls are not allowed. */
4296 | 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" );
4297 | break;
4298 |
4299 | case ENC_DECT_STANDARD_8BITS0x00000056:
4300 | strptr = tvb_get_dect_standard_8bits_stringz(scope, tvb, offset, lengthp);
4301 | break;
4302 | }
4303 |
4304 | return strptr;
4305 | }
4306 |
4307 | /* Looks for a stringz (NUL-terminated string) in tvbuff and copies
4308 | * no more than bufsize number of bytes, including terminating NUL, to buffer.
4309 | * Returns length of string (not including terminating NUL).
4310 | * In this way, it acts like snprintf().
4311 | *
4312 | * bufsize MUST be greater than 0.
4313 | *
4314 | * This function does not otherwise throw an exception for running out of room
4315 | * in the buffer or running out of remaining bytes in the tvbuffer. It will
4316 | * copy as many bytes to the buffer as possible (the lesser of bufsize - 1
4317 | * and the number of remaining captured bytes) and then NUL terminate the
4318 | * string.
4319 | *
4320 | * *bytes_copied will contain the number of bytes actually copied,
4321 | * including the terminating-NUL if present in the frame, but not
4322 | * if it was supplied by the function instead of copied from packet data.
4323 | * [Not currently used, but could be used to determine how much to advance
4324 | * the offset.]
4325 | */
4326 | static unsigned
4327 | _tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const unsigned offset, const unsigned bufsize, uint8_t* buffer, unsigned *bytes_copied)
4328 | {
4329 | int exception;
4330 | int stringlen;
4331 | unsigned limit;
4332 | unsigned len = 0;
4333 |
4334 | /* Only read to end of tvbuff, w/o throwing exception. */
4335 | exception = validate_offset_and_remaining(tvb, offset, &len);
4336 | if (exception)
4337 | THROW(exception)except_throw(1, (exception), ((void*)0));
4338 |
4339 | /* There must at least be room for the terminating NUL. */
4340 | DISSECTOR_ASSERT(bufsize != 0)((void) ((bufsize != 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4340, "bufsize != 0" ))));
4341 |
4342 | /* If there's no room for anything else, just return the NUL. */
4343 | if (bufsize == 1) {
4344 | buffer[0] = 0;
4345 | if (len && tvb_get_uint8(tvb, offset) == 0) {
4346 | *bytes_copied = 1;
4347 | } else {
4348 | *bytes_copied = 0;
4349 | }
4350 | return 0;
4351 | }
4352 |
4353 | /* validate_offset_and_remaining() won't throw an exception if we're
4354 | * looking at the byte immediately after the end of the tvbuff. */
4355 | if (len == 0) {
4356 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
4357 | }
4358 |
4359 | if (len < bufsize) {
4360 | limit = len;
4361 | }
4362 | else {
4363 | limit = bufsize - 1;
4364 | }
4365 |
4366 | stringlen = tvb_strnlen(tvb, offset, limit);
4367 | /* If NUL wasn't found, copy the data up to the limit and terminate */
4368 | if (stringlen == -1) {
4369 | tvb_memcpy(tvb, buffer, offset, limit);
4370 | buffer[limit] = 0;
4371 | *bytes_copied = limit;
4372 | return limit;
4373 | }
4374 |
4375 | /* Copy the string to buffer */
4376 | tvb_memcpy(tvb, buffer, offset, stringlen + 1);
4377 | *bytes_copied = stringlen + 1;
4378 | return (unsigned)stringlen;
4379 | }
4380 |
4381 | unsigned
4382 | tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const unsigned offset, const unsigned bufsize, uint8_t* buffer)
4383 | {
4384 | unsigned bytes_copied;
4385 |
4386 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4386, "tvb && tvb->initialized" ))));
4387 |
4388 | return _tvb_get_raw_bytes_as_stringz(tvb, offset, bufsize, buffer, &bytes_copied);
4389 | }
4390 |
4391 | /*
4392 | * Given a tvbuff, an offset into the tvbuff, a buffer, and a buffer size,
4393 | * extract as many raw bytes from the tvbuff, starting at the offset,
4394 | * as 1) are available in the tvbuff and 2) will fit in the buffer, leaving
4395 | * room for a terminating NUL.
4396 | */
4397 | unsigned
4398 | tvb_get_raw_bytes_as_string(tvbuff_t *tvb, const unsigned offset, char *buffer, size_t bufsize)
4399 | {
4400 | unsigned len = 0;
4401 |
4402 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4402, "tvb && tvb->initialized" ))));
4403 |
4404 | /* There must be room for the string and the terminating NUL. */
4405 | DISSECTOR_ASSERT(bufsize > 0)((void) ((bufsize > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4405, "bufsize > 0" ))));
4406 |
4407 | /* bufsize is size_t, but tvbuffers only have up to unsigned bytes */
4408 | 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" , 4408, "bufsize - 1 < (2147483647 *2U +1U)"))));
4409 |
4410 | len = _tvb_captured_length_remaining(tvb, offset);
4411 | if (len == 0) {
4412 | buffer[0] = '\0';
4413 | return 0;
4414 | }
4415 | if (len > (bufsize - 1))
4416 | len = (unsigned)(bufsize - 1);
4417 |
4418 | /* Copy the string to buffer */
4419 | tvb_memcpy(tvb, buffer, offset, len);
4420 | buffer[len] = '\0';
4421 | return len;
4422 | }
4423 |
4424 | bool_Bool
4425 | tvb_ascii_isprint(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4426 | {
4427 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4427, "tvb && tvb->initialized" ))));
4428 |
4429 | /* XXX - Perhaps this function should return false instead of throwing
4430 | * an exception. */
4431 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4432 |
4433 | for (unsigned i = 0; i < length; i++, buf++)
4434 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4435 | return false0;
4436 |
4437 | return true1;
4438 | }
4439 |
4440 | bool_Bool
4441 | tvb_ascii_isprint_remaining(tvbuff_t *tvb, const unsigned offset)
4442 | {
4443 | int exception;
4444 | unsigned length;
4445 |
4446 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4446, "tvb && tvb->initialized" ))));
4447 |
4448 | exception = validate_offset_and_remaining(tvb, offset, &length);
4449 | if (exception)
4450 | THROW(exception)except_throw(1, (exception), ((void*)0));
4451 |
4452 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4453 |
4454 | for (unsigned i = 0; i < length; i++, buf++)
4455 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4456 | return false0;
4457 |
4458 | return true1;
4459 | }
4460 |
4461 | bool_Bool
4462 | tvb_utf_8_isprint(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4463 | {
4464 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4464, "tvb && tvb->initialized" ))));
4465 |
4466 | /* XXX - Perhaps this function should return false instead of throwing
4467 | * an exception. */
4468 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4469 |
4470 | return isprint_utf8_string((const char*)buf, length);
4471 | }
4472 |
4473 | bool_Bool
4474 | tvb_utf_8_isprint_remaining(tvbuff_t *tvb, const unsigned offset)
4475 | {
4476 | int exception;
4477 | unsigned length;
4478 |
4479 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4479, "tvb && tvb->initialized" ))));
4480 |
4481 | exception = validate_offset_and_remaining(tvb, offset, &length);
4482 | if (exception)
4483 | THROW(exception)except_throw(1, (exception), ((void*)0));
4484 |
4485 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4486 |
4487 | return isprint_utf8_string((const char*)buf, length);
4488 | }
4489 |
4490 | bool_Bool
4491 | tvb_ascii_isdigit(tvbuff_t *tvb, const unsigned offset, const unsigned length)
4492 | {
4493 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4493, "tvb && tvb->initialized" ))));
4494 |
4495 | /* XXX - Perhaps this function should return false instead of throwing
4496 | * an exception. */
4497 | const uint8_t* buf = ensure_contiguous_unsigned(tvb, offset, length);
4498 |
4499 | for (unsigned i = 0; i < length; i++, buf++)
4500 | if (!g_ascii_isdigit(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_DIGIT) != 0))
4501 | return false0;
4502 |
4503 | return true1;
4504 | }
4505 |
4506 | static ws_mempbrk_pattern pbrk_crlf;
4507 |
4508 | static bool_Bool
4509 | _tvb_find_line_end_length(tvbuff_t *tvb, const unsigned offset, const unsigned limit, unsigned *linelen, unsigned *next_offset)
4510 | {
4511 | static bool_Bool compiled = false0;
4512 | unsigned eob_offset;
4513 | unsigned eol_offset;
4514 | unsigned char found_needle = 0;
4515 |
4516 | if (!compiled) {
4517 | ws_mempbrk_compile(&pbrk_crlf, "\r\n");
4518 | compiled = true1;
4519 | }
4520 |
4521 | eob_offset = offset + limit;
4522 |
4523 | /*
4524 | * Look either for a CR or an LF.
4525 | */
4526 | if (!_tvb_ws_mempbrk_uint8_length(tvb, offset, limit, &pbrk_crlf, &eol_offset, &found_needle)) {
4527 | /*
4528 | * No CR or LF - line is presumably continued in next packet.
4529 | */
4530 | /*
4531 | * Pretend the line runs to the end of the tvbuff.
4532 | */
4533 | if (linelen)
4534 | *linelen = eob_offset - offset;
4535 | if (next_offset)
4536 | *next_offset = eob_offset;
4537 | /*
4538 | * Tell our caller we saw no EOL, so they can try to
4539 | * desegment and get the entire line into one tvbuff.
4540 | */
4541 | return false0;
4542 | } else {
4543 | /*
4544 | * Find the number of bytes between the starting offset
4545 | * and the CR or LF.
4546 | */
4547 | if (linelen)
4548 | *linelen = eol_offset - offset;
4549 |
4550 | /*
4551 | * Is it a CR?
4552 | */
4553 | if (found_needle == '\r') {
4554 | /*
4555 | * Yes - is it followed by an LF?
4556 | */
4557 | if (eol_offset + 1 >= eob_offset) {
4558 | /*
4559 | * Dunno - the next byte isn't in this
4560 | * tvbuff.
4561 | */
4562 | if (next_offset)
4563 | *next_offset = eob_offset;
4564 | /*
4565 | * We'll return false, although that
4566 | * runs the risk that if the line
4567 | * really *is* terminated with a CR,
4568 | * we won't properly dissect this
4569 | * tvbuff.
4570 | *
4571 | * It's probably more likely that
4572 | * the line ends with CR-LF than
4573 | * that it ends with CR by itself.
4574 | *
4575 | * XXX - Return a third value?
4576 | */
4577 | return false0;
4578 | } else {
4579 | /*
4580 | * Well, we can at least look at the next
4581 | * byte.
4582 | */
4583 | if (tvb_get_uint8(tvb, eol_offset + 1) == '\n') {
4584 | /*
4585 | * It's an LF; skip over the CR.
4586 | */
4587 | eol_offset++;
4588 | }
4589 | }
4590 | }
4591 |
4592 | /*
4593 | * Return the offset of the character after the last
4594 | * character in the line, skipping over the last character
4595 | * in the line terminator.
4596 | */
4597 | if (next_offset)
4598 | *next_offset = eol_offset + 1;
4599 | }
4600 | return true1;
4601 | }
4602 |
4603 | bool_Bool
4604 | tvb_find_line_end_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *linelen, unsigned *next_offset)
4605 | {
4606 | unsigned limit;
4607 | int exception;
4608 |
4609 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4609, "tvb && tvb->initialized" ))));
4610 |
4611 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4612 | if (exception)
4613 | THROW(exception)except_throw(1, (exception), ((void*)0));
4614 |
4615 | return _tvb_find_line_end_length(tvb, offset, limit, linelen, next_offset);
4616 | }
4617 |
4618 | bool_Bool
4619 | tvb_find_line_end_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *linelen, unsigned *next_offset)
4620 | {
4621 | unsigned limit;
4622 | int exception;
4623 |
4624 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4624, "tvb && tvb->initialized" ))));
4625 |
4626 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4627 | if (exception)
4628 | THROW(exception)except_throw(1, (exception), ((void*)0));
4629 |
4630 | /* Only search to end of tvbuff, w/o throwing exception. */
4631 | if (limit > maxlength) {
4632 | /* Maximum length doesn't go past end of tvbuff; search
4633 | to that value. */
4634 | limit = maxlength;
4635 | }
4636 |
4637 | return _tvb_find_line_end_length(tvb, offset, limit, linelen, next_offset);
4638 | }
4639 |
4640 | static ws_mempbrk_pattern pbrk_crlf_dquote;
4641 |
4642 | static bool_Bool
4643 | _tvb_find_line_end_unquoted_length(tvbuff_t *tvb, const unsigned offset, unsigned limit, unsigned *linelen, unsigned *next_offset)
4644 | {
4645 | unsigned cur_offset, char_offset;
4646 | bool_Bool is_quoted;
4647 | unsigned char c = 0;
4648 | unsigned eob_offset;
4649 | static bool_Bool compiled = false0;
4650 | unsigned len;
4651 | bool_Bool found;
4652 |
4653 | if (!compiled) {
4654 | ws_mempbrk_compile(&pbrk_crlf_dquote, "\r\n\"");
4655 | compiled = true1;
4656 | }
4657 |
4658 | eob_offset = offset + limit;
4659 |
4660 | cur_offset = offset;
4661 | is_quoted = false0;
4662 | for (;;) {
4663 | len = limit - (cur_offset - offset);
4664 | /*
4665 | * Is this part of the string quoted?
4666 | */
4667 | if (is_quoted) {
4668 | /*
4669 | * Yes - look only for the terminating quote.
4670 | */
4671 | found = _tvb_find_uint8_length(tvb, cur_offset, len, '"', &char_offset);
4672 | } else {
4673 | /*
4674 | * Look either for a CR, an LF, or a '"'.
4675 | */
4676 | found = _tvb_ws_mempbrk_uint8_length(tvb, cur_offset, len, &pbrk_crlf_dquote, &char_offset, &c);
4677 | }
4678 | if (!found) {
4679 | /*
4680 | * Not found - line is presumably continued in
4681 | * next packet.
4682 | * We pretend the line runs to the end of the tvbuff.
4683 | */
4684 | if (linelen)
4685 | *linelen = eob_offset - offset;
4686 | if (next_offset)
4687 | *next_offset = eob_offset;
4688 | break;
4689 | }
4690 |
4691 | if (is_quoted) {
4692 | /*
4693 | * We're processing a quoted string.
4694 | * We only looked for ", so we know it's a ";
4695 | * as we're processing a quoted string, it's a
4696 | * closing quote.
4697 | */
4698 | is_quoted = false0;
4699 | } else {
4700 | /*
4701 | * OK, what is it?
4702 | */
4703 | if (c == '"') {
4704 | /*
4705 | * Un-quoted "; it begins a quoted
4706 | * string.
4707 | */
4708 | is_quoted = true1;
4709 | } else {
4710 | /*
4711 | * It's a CR or LF; we've found a line
4712 | * terminator.
4713 | *
4714 | * Find the number of bytes between the
4715 | * starting offset and the CR or LF.
4716 | */
4717 | if (linelen)
4718 | *linelen = char_offset - offset;
4719 |
4720 | /*
4721 | * Is it a CR?
4722 | */
4723 | if (c == '\r') {
4724 | /*
4725 | * Yes; is it followed by an LF?
4726 | */
4727 | if (char_offset + 1 < eob_offset &&
4728 | tvb_get_uint8(tvb, char_offset + 1)
4729 | == '\n') {
4730 | /*
4731 | * Yes; skip over the CR.
4732 | */
4733 | char_offset++;
4734 | }
4735 | }
4736 |
4737 | /*
4738 | * Return the offset of the character after
4739 | * the last character in the line, skipping
4740 | * over the last character in the line
4741 | * terminator, and quit.
4742 | */
4743 | if (next_offset)
4744 | *next_offset = char_offset + 1;
4745 | break;
4746 | }
4747 | }
4748 |
4749 | /*
4750 | * Step past the character we found.
4751 | */
4752 | cur_offset = char_offset + 1;
4753 | if (cur_offset >= eob_offset) {
4754 | /*
4755 | * The character we found was the last character
4756 | * in the tvbuff - line is presumably continued in
4757 | * next packet.
4758 | * We pretend the line runs to the end of the tvbuff.
4759 | */
4760 | if (linelen)
4761 | *linelen = eob_offset - offset;
4762 | if (next_offset)
4763 | *next_offset = eob_offset;
4764 | break;
4765 | }
4766 | }
4767 | return found;
4768 | }
4769 |
4770 | /*
4771 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4772 | * at that offset (which may be -1 for "all the way to the end of the
4773 | * tvbuff"), find the end of the (putative) line that starts at the
4774 | * specified offset in the tvbuff, going no further than the specified
4775 | * length.
4776 | *
4777 | * However, treat quoted strings inside the buffer specially - don't
4778 | * treat newlines in quoted strings as line terminators.
4779 | *
4780 | * Return the length of the line (not counting the line terminator at
4781 | * the end), or the amount of data remaining in the buffer if we don't
4782 | * find a line terminator.
4783 | *
4784 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4785 | * character past the line terminator, or past the end of the buffer if
4786 | * we don't find a line terminator.
4787 | */
4788 | int
4789 | tvb_find_line_end_unquoted(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset)
4790 | {
4791 | unsigned linelen;
4792 | unsigned abs_next_offset;
4793 | unsigned limit;
4794 | int exception;
4795 |
4796 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4796, "tvb && tvb->initialized" ))));
4797 |
4798 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4799 | if (exception)
4800 | THROW(exception)except_throw(1, (exception), ((void*)0));
4801 |
4802 | /* Only search to end of tvbuff, w/o throwing exception. */
4803 | if (len >= 0 && limit > (unsigned) len) {
4804 | /* Maximum length doesn't go past end of tvbuff; search
4805 | to that value. */
4806 | limit = (unsigned) len;
4807 | }
4808 |
4809 | _tvb_find_line_end_unquoted_length(tvb, offset, limit, &linelen, &abs_next_offset);
4810 | if (next_offset) {
4811 | *next_offset = (int)abs_next_offset;
4812 | }
4813 | return (int)linelen;
4814 | }
4815 |
4816 | bool_Bool
4817 | tvb_find_line_end_unquoted_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *linelen, unsigned *next_offset)
4818 | {
4819 | unsigned limit;
4820 | int exception;
4821 |
4822 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4822, "tvb && tvb->initialized" ))));
4823 |
4824 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4825 | if (exception)
4826 | THROW(exception)except_throw(1, (exception), ((void*)0));
4827 |
4828 | return _tvb_find_line_end_unquoted_length(tvb, offset, limit, linelen, next_offset);
4829 | }
4830 |
4831 | bool_Bool
4832 | tvb_find_line_end_unquoted_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *linelen, unsigned *next_offset)
4833 | {
4834 | unsigned limit;
4835 | int exception;
4836 |
4837 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4837, "tvb && tvb->initialized" ))));
4838 |
4839 | exception = validate_offset_and_remaining(tvb, offset, &limit);
4840 | if (exception)
4841 | THROW(exception)except_throw(1, (exception), ((void*)0));
4842 |
4843 | /* Only search to end of tvbuff, w/o throwing exception. */
4844 | if (limit > maxlength) {
4845 | /* Maximum length doesn't go past end of tvbuff; search
4846 | to that value. */
4847 | limit = maxlength;
4848 | }
4849 |
4850 | return _tvb_find_line_end_unquoted_length(tvb, offset, limit, linelen, next_offset);
4851 | }
4852 |
4853 | /*
4854 | * Copied from the mgcp dissector. (This function should be moved to /epan )
4855 | * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
4856 | * character following offset or offset + maxlength -1 whichever
4857 | * is smaller.
4858 | *
4859 | * Parameters:
4860 | * tvb - The tvbuff in which we are skipping whitespace.
4861 | * offset - The offset in tvb from which we begin trying to skip whitespace.
4862 | * maxlength - The maximum distance from offset that we may try to skip
4863 | * whitespace.
4864 | *
4865 | * Returns: The position in tvb of the first non-whitespace
4866 | * character following offset or offset + maxlength -1 whichever
4867 | * is smaller.
4868 | */
4869 | unsigned
4870 | tvb_skip_wsp(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength)
4871 | {
4872 | unsigned counter;
4873 | unsigned end, tvb_len;
4874 | uint8_t tempchar;
4875 |
4876 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4876, "tvb && tvb->initialized" ))));
4877 |
4878 | /* Get the length remaining */
4879 | /*tvb_len = tvb_captured_length(tvb);*/
4880 | tvb_len = tvb->length;
4881 |
4882 | if (ckd_add(&end, offset, maxlength)__builtin_add_overflow((offset), (maxlength), (&end)) || end > tvb_len) {
4883 | end = tvb_len;
4884 | }
4885 |
4886 | /* Skip past spaces, tabs, CRs and LFs until run out or meet something else */
4887 | /* XXX - The MEGACO dissector uses g_ascii_isspace(), which might be
4888 | * slightly faster but also tests for vertical tab and form feed. */
4889 | for (counter = offset;
4890 | counter < end &&
4891 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4892 | tempchar == '\t' || tempchar == '\r' || tempchar == '\n');
4893 | counter++);
4894 |
4895 | return counter;
4896 | }
4897 |
4898 | unsigned
4899 | tvb_skip_wsp_return(tvbuff_t *tvb, const unsigned offset)
4900 | {
4901 | unsigned counter;
4902 | uint8_t tempchar;
4903 |
4904 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4904, "tvb && tvb->initialized" ))));
4905 |
4906 | /* XXX - DISSECTOR_ASSERT(offset > 0) and then subtract 1 from offset?
4907 | * The way this is used the caller almost always wants to subtract one
4908 | * from the offset of a non WSP separator, and they might forget to do
4909 | * so and then this function return the offset past the separator. */
4910 |
4911 | /* XXX - The MEGACO dissector uses g_ascii_isspace(), which might be
4912 | * slightly faster but also tests for vertical tab and form feed. */
4913 | for (counter = offset; counter > 0 &&
4914 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4915 | tempchar == '\t' || tempchar == '\n' || tempchar == '\r'); counter--);
4916 | counter++;
4917 |
4918 | return counter;
4919 | }
4920 |
4921 | unsigned
4922 | tvb_skip_uint8(tvbuff_t *tvb, unsigned offset, const unsigned maxlength, const uint8_t ch)
4923 | {
4924 | unsigned end, tvb_len;
4925 |
4926 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4926, "tvb && tvb->initialized" ))));
4927 |
4928 | /* Get the length remaining */
4929 | /*tvb_len = tvb_captured_length(tvb);*/
4930 | tvb_len = tvb->length;
4931 |
4932 | if (ckd_add(&end, offset, maxlength)__builtin_add_overflow((offset), (maxlength), (&end)) || end > tvb_len) {
4933 | end = tvb_len;
4934 | }
4935 |
4936 | while (offset < end) {
4937 | uint8_t tempch = tvb_get_uint8(tvb, offset);
4938 |
4939 | if (tempch != ch)
4940 | break;
4941 | offset++;
4942 | }
4943 |
4944 | return offset;
4945 | }
4946 |
4947 | static ws_mempbrk_pattern pbrk_whitespace;
4948 |
4949 | static bool_Bool
4950 | _tvb_get_token_len_length(tvbuff_t *tvb, const unsigned offset, unsigned limit, unsigned *tokenlen, unsigned *next_offset)
4951 | {
4952 | unsigned eot_offset;
4953 | unsigned char found_needle = 0;
4954 | static bool_Bool compiled = false0;
4955 |
4956 | if (!compiled) {
4957 | ws_mempbrk_compile(&pbrk_whitespace, " \r\n");
4958 | compiled = true1;
4959 | }
4960 |
4961 | /*
4962 | * Look either for a space, CR, or LF.
4963 | */
4964 | if (!_tvb_ws_mempbrk_uint8_length(tvb, offset, limit, &pbrk_whitespace, &eot_offset, &found_needle)) {
4965 | /*
4966 | * No space, CR or LF - token is presumably continued in next packet.
4967 | */
4968 | /*
4969 | * Pretend the token runs to the end of the tvbuff.
4970 | */
4971 | if (tokenlen)
4972 | *tokenlen = eot_offset - offset;
4973 | if (next_offset)
4974 | *next_offset = eot_offset;
4975 | /*
4976 | * Tell our caller we saw no whitespace, so they can
4977 | * try to desegment and get the entire line
4978 | * into one tvbuff.
4979 | */
4980 | return false0;
4981 | }
4982 |
4983 | /*
4984 | * Find the number of bytes between the starting offset
4985 | * and the space, CR or LF.
4986 | */
4987 | if (tokenlen)
4988 | *tokenlen = eot_offset - offset;
4989 |
4990 | /*
4991 | * Return the offset of the character after the token delimiter,
4992 | * skipping over the last character in the separator.
4993 | *
4994 | * XXX - get_token_len() from strutil.h returns the start offset of
4995 | * the next token by skipping trailing spaces (but not spaces that
4996 | * follow a CR or LF, only consecutive spaces). Should we align
4997 | * the two functions? Most dissectors want to skip extra spaces,
4998 | * and while the dissector _can_ follow up with tvb_skip_wsp, this
4999 | * probably causes dissectors to use tvb_get_ptr + get_token_len,
5000 | * which we want to discourage. OTOH, IMAP, which uses this, says
5001 | * "in all cases, SP refers to exactly one space. It is NOT permitted
5002 | * to substitute TAB, insert additional spaces, or otherwise treat
5003 | * SP as being equivalent to linear whitespace (LWSP)."
5004 | * https://www.rfc-editor.org/rfc/rfc9051.html#name-formal-syntax
5005 | *
5006 | * XXX - skip over CR-LF as a unit like tvb_find_line_end()?
5007 | * get_token_len() doesn't, probably because most dissectors have
5008 | * already found the line end before, but it probably makes sense
5009 | * to do and unlike above it's unlikely it would break any protocol
5010 | * (and might even fix some.)
5011 | */
5012 | if (next_offset)
5013 | *next_offset = eot_offset + 1;
5014 |
5015 | return true1;
5016 | }
5017 |
5018 | int tvb_get_token_len(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset, const bool_Bool desegment)
5019 | {
5020 | unsigned tokenlen;
5021 | unsigned abs_next_offset;
5022 | unsigned limit;
5023 | int exception;
5024 |
5025 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5025, "tvb && tvb->initialized" ))));
5026 |
5027 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5028 | if (exception)
5029 | THROW(exception)except_throw(1, (exception), ((void*)0));
5030 |
5031 | /* Only search to end of tvbuff, w/o throwing exception. */
5032 | if (len >= 0 && limit > (unsigned) len) {
5033 | /* Maximum length doesn't go past end of tvbuff; search
5034 | to that value. */
5035 | limit = (unsigned) len;
5036 | }
5037 |
5038 | if (!_tvb_get_token_len_length(tvb, offset, limit, &tokenlen, &abs_next_offset) && desegment) {
5039 | return -1;
5040 | }
5041 | if (next_offset) {
5042 | *next_offset = (int)abs_next_offset;
5043 | }
5044 | return (int)tokenlen;
5045 | }
5046 |
5047 | bool_Bool
5048 | tvb_get_token_len_remaining(tvbuff_t *tvb, const unsigned offset, unsigned *tokenlen, unsigned *next_offset)
5049 | {
5050 | unsigned limit;
5051 | int exception;
5052 |
5053 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5053, "tvb && tvb->initialized" ))));
5054 |
5055 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5056 | if (exception)
5057 | THROW(exception)except_throw(1, (exception), ((void*)0));
5058 |
5059 | return _tvb_get_token_len_length(tvb, offset, limit, tokenlen, next_offset);
5060 | }
5061 |
5062 | bool_Bool
5063 | tvb_get_token_len_length(tvbuff_t *tvb, const unsigned offset, const unsigned maxlength, unsigned *tokenlen, unsigned *next_offset)
5064 | {
5065 | unsigned limit;
5066 | int exception;
5067 |
5068 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5068, "tvb && tvb->initialized" ))));
5069 |
5070 | exception = validate_offset_and_remaining(tvb, offset, &limit);
5071 | if (exception)
5072 | THROW(exception)except_throw(1, (exception), ((void*)0));
5073 |
5074 | /* Only search to end of tvbuff, w/o throwing exception. */
5075 | if (limit > maxlength) {
5076 | /* Maximum length doesn't go past end of tvbuff; search
5077 | to that value. */
5078 | limit = maxlength;
5079 | }
5080 |
5081 | return _tvb_get_token_len_length(tvb, offset, limit, tokenlen, next_offset);
5082 | }
5083 |
5084 | /*
5085 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
5086 | * to the string with the formatted data, with "punct" as a byte
5087 | * separator.
5088 | */
5089 | char *
5090 | tvb_bytes_to_str_punct(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned len, const char punct)
5091 | {
5092 | 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);
5093 | }
5094 |
5095 | /*
5096 | * Given a wmem scope, a tvbuff, an offset, a length, an input digit
5097 | * set, and a boolean indicator, fetch BCD-encoded digits from a
5098 | * tvbuff starting from either the low or high half byte of the
5099 | * first byte depending on the boolean indicator (true means "start
5100 | * with the high half byte, ignoring the low half byte", and false
5101 | * means "start with the low half byte and proceed to the high half
5102 | * byte), formating the digits into characters according to the
5103 | * input digit set, and return a pointer to a UTF-8 string, allocated
5104 | * using the wmem scope. A nibble of 0xf is considered a 'filler'
5105 | * and will end the conversion. Similarly if odd is set the last
5106 | * high nibble will be omitted. (Note that if both skip_first and
5107 | * odd are true, then both the first and last semi-octet are skipped,
5108 | * i.e. an even number of nibbles are considered.)
5109 | */
5110 | char *
5111 | 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)
5112 | {
5113 | const uint8_t *ptr;
5114 | int i = 0;
5115 | char *digit_str;
5116 | uint8_t octet, nibble;
5117 |
5118 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 5118, "tvb && tvb->initialized" ))));
5119 |
5120 | ptr = ensure_contiguous_unsigned(tvb, offset, len);
5121 |
5122 | /*
5123 | * XXX - map illegal digits (digits that map to 0) to REPLACEMENT
5124 | * CHARACTER, and have all the tables in epan/tvbuff.c use 0 rather
5125 | * than '?'?
5126 | */
5127 | digit_str = (char *)wmem_alloc(scope, len*2 + 1);
5128 |
5129 | while (len > 0) {
5130 | octet = *ptr;
5131 | if (!skip_first) {
5132 | if (bigendian) {
5133 | nibble = (octet >> 4) & 0x0f;
5134 | } else {
5135 | nibble = octet & 0x0f;
5136 | }
5137 | if (nibble == 0x0f) {
5138 | /*
5139 | * Stop digit.
5140 | */
5141 | break;
5142 | }
5143 | digit_str[i] = dgt->out[nibble];
5144 | i++;
5145 | }
5146 | skip_first = false0;
5147 |
5148 | /*
5149 | * unpack second value in byte
5150 | */
5151 | if (bigendian) {
5152 | nibble = octet & 0x0f;
5153 | } else {
5154 | nibble = octet >> 4;
5155 | }
5156 |
5157 | if (nibble == 0x0f) {
5158 | /*
5159 | * This is the stop digit or a filler digit. Ignore
5160 | * it.
5161 | */
5162 | break;
5163 | }
5164 | if ((len == 1) && (odd == true1 )){
5165 | /* Last octet, skip last high nibble in case of odd number of digits */
5166 | break;
5167 | }
5168 | digit_str[i] = dgt->out[nibble];
5169 | i++;
5170 |
5171 | ptr++;
5172 | len--;
5173 | }
5174 | digit_str[i] = '\0';
5175 | return digit_str;
5176 | }
5177 |
5178 | /* XXXX Fix me - needs odd indicator added (or just use of tvb_get_bcd_string / proto_tree_add_item) */
5179 | const char *
5180 | 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)
5181 | {
5182 | if (!dgt)
5183 | dgt = &Dgt0_9_bcd;
5184 |
5185 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, false0);
5186 | }
5187 |
5188 | const char *
5189 | 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)
5190 | {
5191 | if (!dgt)
5192 | dgt = &Dgt0_9_bcd;
5193 |
5194 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, true1);
5195 | }
5196 |
5197 | /*
5198 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
5199 | * to the string with the formatted data.
5200 | */
5201 | char *
5202 | tvb_bytes_to_str(wmem_allocator_t *allocator, tvbuff_t *tvb, const unsigned offset, const unsigned len)
5203 | {
5204 | 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);
5205 | }
5206 |
5207 | /* Find a needle tvbuff within a haystack tvbuff. */
5208 | int
5209 | tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const int haystack_offset)
5210 | {
5211 | unsigned haystack_abs_offset = 0, haystack_abs_length = 0;
5212 | const uint8_t *haystack_data;
5213 | const uint8_t *needle_data;
5214 | const unsigned needle_len = needle_tvb->length;
5215 | const uint8_t *location;
5216 |
5217 | 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", 5217, "haystack_tvb && haystack_tvb->initialized" ))));
5218 |
5219 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
5220 | return -1;
5221 | }
5222 |
5223 | /* Get pointers to the tvbuffs' data. */
5224 | haystack_data = ensure_contiguous(haystack_tvb, 0, -1);
5225 | needle_data = ensure_contiguous(needle_tvb, 0, -1);
5226 |
5227 | check_offset_length(haystack_tvb, haystack_offset, -1,
5228 | &haystack_abs_offset, &haystack_abs_length);
5229 |
5230 | location = ws_memmem(haystack_data + haystack_abs_offset, haystack_abs_length,
5231 | needle_data, needle_len);
5232 |
5233 | if (location) {
5234 | return (int) (location - haystack_data);
5235 | }
5236 |
5237 | return -1;
5238 | }
5239 |
5240 | /* Find a needle tvbuff within a haystack tvbuff. */
5241 | bool_Bool
5242 | tvb_find_tvb_remaining(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const unsigned haystack_offset, unsigned *found_offset)
5243 | {
5244 | const uint8_t *haystack_data;
5245 | const uint8_t *needle_data;
5246 | const unsigned needle_len = needle_tvb->length;
5247 | const uint8_t *location;
5248 | int exception;
5249 | unsigned haystack_rem_length;
5250 |
5251 | 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", 5251, "haystack_tvb && haystack_tvb->initialized" ))));
5252 | 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", 5252, "needle_tvb && needle_tvb->initialized" ))));
5253 |
5254 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
5255 | return false0;
5256 | }
5257 |
5258 | exception = validate_offset_and_remaining(haystack_tvb, haystack_offset, &haystack_rem_length);
5259 | if (exception)
5260 | THROW(exception)except_throw(1, (exception), ((void*)0));
5261 |
5262 | /* Get pointers to the tvbuffs' data. */
5263 | haystack_data = ensure_contiguous_unsigned(haystack_tvb, haystack_offset, haystack_rem_length);
5264 | needle_data = ensure_contiguous_unsigned(needle_tvb, 0, needle_len);
5265 |
5266 | location = ws_memmem(haystack_data, haystack_rem_length,
5267 | needle_data, needle_len);
5268 |
5269 | if (location) {
5270 | if (found_offset)
5271 | *found_offset = (unsigned) (location - haystack_data) + haystack_offset;
5272 | return true1;
5273 | }
5274 |
5275 | return false0;
5276 | }
5277 |
5278 | unsigned
5279 | tvb_raw_offset(tvbuff_t *tvb)
5280 | {
5281 | if (!(tvb->flags & TVBUFF_RAW_OFFSET0x00000002)) {
5282 | tvb->raw_offset = tvb_offset_from_real_beginning(tvb);
5283 | tvb->flags |= TVBUFF_RAW_OFFSET0x00000002;
5284 | }
5285 | return tvb->raw_offset;
5286 | }
5287 |
5288 | void
5289 | tvb_set_fragment(tvbuff_t *tvb)
5290 | {
5291 | tvb->flags |= TVBUFF_FRAGMENT0x00000001;
5292 | }
5293 |
5294 | struct tvbuff *
5295 | tvb_get_ds_tvb(tvbuff_t *tvb)
5296 | {
5297 | return(tvb->ds_tvb);
5298 | }
5299 |
5300 | unsigned
5301 | tvb_get_varint(tvbuff_t *tvb, unsigned offset, unsigned maxlen, uint64_t *value, const unsigned encoding)
5302 | {
5303 | *value = 0;
5304 |
5305 | switch (encoding & ENC_VARINT_MASK(0x00000002|0x00000004|0x00000008|0x00000010)) {
5306 | case ENC_VARINT_PROTOBUF0x00000002:
5307 | {
5308 | unsigned i;
5309 | uint64_t b; /* current byte */
5310 |
5311 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5312 | b = tvb_get_uint8(tvb, offset++);
5313 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
5314 |
5315 | if (b < 0x80) {
5316 | /* end successfully because of last byte's msb(most significant bit) is zero */
5317 | return i + 1;
5318 | }
5319 | }
5320 | break;
5321 | }
5322 |
5323 | case ENC_VARINT_ZIGZAG0x00000008:
5324 | {
5325 | unsigned i;
5326 | uint64_t b; /* current byte */
5327 |
5328 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5329 | b = tvb_get_uint8(tvb, offset++);
5330 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
5331 |
5332 | if (b < 0x80) {
5333 | /* end successfully because of last byte's msb(most significant bit) is zero */
5334 | *value = (*value >> 1) ^ ((*value & 1) ? -1 : 0);
5335 | return i + 1;
5336 | }
5337 | }
5338 | break;
5339 | }
5340 |
5341 | case ENC_VARINT_SDNV0x00000010:
5342 | {
5343 | /* Decodes similar to protobuf but in MSByte order */
5344 | unsigned i;
5345 | uint64_t b; /* current byte */
5346 |
5347 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
5348 | b = tvb_get_uint8(tvb, offset++);
5349 | if ((i == 9) && (*value >= UINT64_C(1)1UL<<(64-7))) {
5350 | // guaranteed overflow, not valid SDNV
5351 | return 0;
5352 | }
5353 | *value <<= 7;
5354 | *value |= (b & 0x7F); /* add lower 7 bits to val */
5355 |
5356 | if (b < 0x80) {
5357 | /* end successfully because of last byte's msb(most significant bit) is zero */
5358 | return i + 1;
5359 | }
5360 | }
5361 | break;
5362 | }
5363 |
5364 | case ENC_VARINT_QUIC0x00000004:
5365 | {
5366 | /* calculate variable length */
5367 | *value = tvb_get_uint8(tvb, offset);
5368 | switch((*value) >> 6) {
5369 | case 0: /* 0b00 => 1 byte length (6 bits Usable) */
5370 | (*value) &= 0x3F;
5371 | return 1;
5372 | case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
5373 | *value = tvb_get_ntohs(tvb, offset) & 0x3FFF;
5374 | return 2;
5375 | case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
5376 | *value = tvb_get_ntohl(tvb, offset) & 0x3FFFFFFF;
5377 | return 4;
5378 | case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
5379 | *value = tvb_get_ntoh64(tvb, offset) & UINT64_C(0x3FFFFFFFFFFFFFFF)0x3FFFFFFFFFFFFFFFUL;
5380 | return 8;
5381 | default: /* No Possible */
5382 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 5382, __func__, "assertion \"not reached\" failed");
5383 | break;
5384 | }
5385 | break;
5386 | }
5387 |
5388 | default:
5389 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 5389));
5390 | }
5391 |
5392 | return 0; /* 10 bytes scanned, but no bytes' msb is zero */
5393 | }
5394 |
5395 | /*
5396 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
5397 | *
5398 | * Local variables:
5399 | * c-basic-offset: 8
5400 | * tab-width: 8
5401 | * indent-tabs-mode: t
5402 | * End:
5403 | *
5404 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
5405 | * :indentSize=8:tabSize=8:noTabs=false:
5406 | */