3 * Testy, Virtual(-izable) Buffer of guint8*'s
5 * "Testy" -- the buffer gets mad when an attempt is made to access data
6 * beyond the bounds of the buffer. An exception is thrown.
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
14 * Copyright (c) 2000 by Gilbert Ramirez <gram@alumni.rice.edu>
16 * Wireshark - Network traffic analyzer
17 * By Gerald Combs <gerald@wireshark.org>
18 * Copyright 1998 Gerald Combs
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version 2
23 * of the License, or (at your option) any later version.
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, write to the Free Software
32 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
39 #include <epan/ipv6-utils.h>
40 #include <epan/guid-utils.h>
41 #include "exceptions.h"
44 * "testy, virtual(-izable) buffer". They are testy in that they get mad when
45 * an attempt is made to access data beyond the bounds of their array. In that
46 * case, they throw an exception.
48 * They are virtualizable in that new tvbuff's can be made from other tvbuffs,
49 * while only the original tvbuff may have data. That is, the new tvbuff has
54 /** The different types of tvbuff's */
62 /* The backing tvbuff_t */
65 /* The offset/length of 'tvb' to which I'm privy */
74 /* Used for quick testing to see if this
75 * is the tvbuff that a COMPOSITE is
82 typedef void (*tvbuff_free_cb_t)(void*);
84 typedef struct tvbuff {
89 struct tvbuff *ds_tvb; /* data source top-level tvbuff */
91 /* The tvbuffs in which this tvbuff is a member
92 * (that is, a backing tvbuff for a TVBUFF_SUBSET
93 * or a member for a TVB_COMPOSITE) */
96 /* TVBUFF_SUBSET and TVBUFF_COMPOSITE keep track
97 * of the other tvbuff's they use */
100 tvb_comp_t composite;
103 /* We're either a TVBUFF_REAL_DATA or a
104 * TVBUFF_SUBSET that has a backing buffer that
105 * has real_data != NULL, or a TVBUFF_COMPOSITE
106 * which has flattened its data due to a call
109 const guint8 *real_data;
111 /* Length of virtual buffer (and/or real_data). */
114 /* Reported length. */
115 guint reported_length;
117 /* Offset from beginning of first TVBUFF_REAL. */
120 /* Func to call when actually freed */
121 tvbuff_free_cb_t free_cb;
126 /** TVBUFF_REAL_DATA contains a guint8* that points to real data.
127 * The data is allocated and contiguous.
129 * TVBUFF_SUBSET has a backing tvbuff. The TVBUFF_SUBSET is a "window"
130 * through which the program sees only a portion of the backing tvbuff.
132 * TVBUFF_COMPOSITE combines multiple tvbuffs sequentually to produce
133 * a larger byte array.
135 * tvbuff's of any type can be used as the backing-tvbuff of a
136 * TVBUFF_SUBSET or as the member of a TVBUFF_COMPOSITE.
137 * TVBUFF_COMPOSITEs can have member-tvbuffs of different types.
139 * Once a tvbuff is create/initialized/finalized, the tvbuff is read-only.
140 * That is, it cannot point to any other data. A new tvbuff must be created if
141 * you want a tvbuff that points to other data.
145 /** "class" initialization. Called once during execution of program
146 * so that tvbuff.c can initialize its data. */
147 extern void tvbuff_init(void);
149 /** "class" cleanup. Called once during execution of program
150 * so that tvbuff.c can clean up its data. */
151 extern void tvbuff_cleanup(void);
154 /** Returns a pointer to a newly initialized tvbuff. Note that
155 * tvbuff's of types TVBUFF_SUBSET and TVBUFF_COMPOSITE
156 * require further initialization via the appropriate functions */
157 extern tvbuff_t* tvb_new(tvbuff_type);
159 /** Marks a tvbuff for freeing. The guint8* data of a TVBUFF_REAL_DATA
160 * is *never* freed by the tvbuff routines. The tvbuff itself is actually freed
161 * once its usage count drops to 0.
163 * Usage counts increment for any time the tvbuff is
164 * used as a member of another tvbuff, i.e., as the backing buffer for
165 * a TVBUFF_SUBSET or as a member of a TVBUFF_COMPOSITE.
167 * Although you may call tvb_free(), the tvbuff may still be in use
168 * by other tvbuff's (TVBUFF_SUBSET or TVBUFF_COMPOSITE), so it is not
169 * safe, unless you know otherwise, to free your guint8* data. If you
170 * cannot be sure that your TVBUFF_REAL_DATA is not in use by another
171 * tvbuff, register a callback with tvb_set_free_cb(); when your tvbuff
172 * is _really_ freed, then your callback will be called, and at that time
173 * you can free your original data.
175 * The caller can artificially increment/decrement the usage count
176 * with tvbuff_increment_usage_count()/tvbuff_decrement_usage_count().
178 extern void tvb_free(tvbuff_t*);
180 /** Free the tvbuff_t and all tvbuff's created from it. */
181 extern void tvb_free_chain(tvbuff_t*);
183 /** Both return the new usage count, after the increment or decrement */
184 extern guint tvb_increment_usage_count(tvbuff_t*, guint count);
186 /** If a decrement causes the usage count to drop to 0, a the tvbuff
187 * is immediately freed. Be sure you know exactly what you're doing
188 * if you decide to use this function, as another tvbuff could
189 * still have a pointer to the just-freed tvbuff, causing corrupted data
190 * or a segfault in the future */
191 extern guint tvb_decrement_usage_count(tvbuff_t*, guint count);
193 /** Set a callback function to call when a tvbuff is actually freed
194 * (once the usage count drops to 0). One argument is passed to
195 * that callback --- a void* that points to the real data.
196 * Obviously, this only applies to a TVBUFF_REAL_DATA tvbuff. */
197 extern void tvb_set_free_cb(tvbuff_t*, tvbuff_free_cb_t);
200 /** Attach a TVBUFF_REAL_DATA tvbuff to a parent tvbuff. This connection
201 * is used during a tvb_free_chain()... the "child" TVBUFF_REAL_DATA acts
202 * as if is part of the chain-of-creation of the parent tvbuff, although it
203 * isn't. This is useful if you need to take the data from some tvbuff,
204 * run some operation on it, like decryption or decompression, and make a new
205 * tvbuff from it, yet want the new tvbuff to be part of the chain. The reality
206 * is that the new tvbuff *is* part of the "chain of creation", but in a way
207 * that these tvbuff routines is ignorant of. Use this function to make
208 * the tvbuff routines knowledgable of this fact. */
209 extern void tvb_set_child_real_data_tvbuff(tvbuff_t* parent, tvbuff_t* child);
211 extern tvbuff_t* tvb_new_child_real_data(tvbuff_t* parent, const guint8* data, guint length,
212 gint reported_length);
214 /**Sets parameters for TVBUFF_REAL_DATA. Can throw ReportedBoundsError. */
215 extern void tvb_set_real_data(tvbuff_t*, const guint8* data, guint length,
216 gint reported_length);
218 /** Combination of tvb_new() and tvb_set_real_data(). Can throw ReportedBoundsError. */
219 extern tvbuff_t* tvb_new_real_data(const guint8* data, guint length,
220 gint reported_length);
223 /** Define the subset of the backing buffer to use.
225 * 'backing_offset' can be negative, to indicate bytes from
226 * the end of the backing buffer.
228 * 'backing_length' can be 0, although the usefulness of the buffer would
231 * 'backing_length' of -1 means "to the end of the backing buffer"
233 * Will throw BoundsError if 'backing_offset'/'length'
234 * is beyond the bounds of the backing tvbuff.
235 * Can throw ReportedBoundsError. */
236 extern void tvb_set_subset(tvbuff_t* tvb, tvbuff_t* backing,
237 gint backing_offset, gint backing_length, gint reported_length);
239 /** Combination of tvb_new() and tvb_set_subset()
240 * Can throw ReportedBoundsError. */
241 extern tvbuff_t* tvb_new_subset(tvbuff_t* backing,
242 gint backing_offset, gint backing_length, gint reported_length);
244 /** Similar to tvb_new_subset() but with backing_length and reported_length set to -1.
245 * Can throw ReportedBoundsError. */
246 extern tvbuff_t* tvb_new_subset_remaining(tvbuff_t* backing,
247 gint backing_offset);
249 /** Both tvb_composite_append and tvb_composite_prepend can throw
250 * BoundsError if member_offset/member_length goes beyond bounds of
251 * the 'member' tvbuff. */
253 /** Append to the list of tvbuffs that make up this composite tvbuff */
254 extern void tvb_composite_append(tvbuff_t* tvb, tvbuff_t* member);
256 /** Prepend to the list of tvbuffs that make up this composite tvbuff */
257 extern void tvb_composite_prepend(tvbuff_t* tvb, tvbuff_t* member);
259 /** Helper function that calls tvb_new(TVBUFF_COMPOSITE).
260 * Provided only to maintain symmetry with other constructors */
261 extern tvbuff_t* tvb_new_composite(void);
263 /** Mark a composite tvbuff as initialized. No further appends or prepends
264 * occur, data access can finally happen after this finalization. */
265 extern void tvb_composite_finalize(tvbuff_t* tvb);
268 /* Get total length of buffer */
269 extern guint tvb_length(tvbuff_t*);
271 /** Computes bytes to end of buffer, from offset (which can be negative,
272 * to indicate bytes from end of buffer). Function returns -1 to
273 * indicate that offset is out of bounds. No exception is thrown. */
274 extern gint tvb_length_remaining(tvbuff_t*, gint offset);
276 /** Same as above, but throws an exception if the offset is out of bounds. */
277 extern guint tvb_ensure_length_remaining(tvbuff_t*, gint offset);
279 /* Checks (w/o throwing exception) that the bytes referred to by
280 * 'offset'/'length' actually exist in the buffer */
281 extern gboolean tvb_bytes_exist(tvbuff_t*, gint offset, gint length);
283 /** Checks that the bytes referred to by 'offset'/'length' actually exist
284 * in the buffer, and throws an exception if they aren't. */
285 extern void tvb_ensure_bytes_exist(tvbuff_t *tvb, gint offset, gint length);
287 /* Checks (w/o throwing exception) that offset exists in buffer */
288 extern gboolean tvb_offset_exists(tvbuff_t*, gint offset);
290 /* Get reported length of buffer */
291 extern guint tvb_reported_length(tvbuff_t*);
293 /** Computes bytes of reported packet data to end of buffer, from offset
294 * (which can be negative, to indicate bytes from end of buffer). Function
295 * returns -1 to indicate that offset is out of bounds. No exception is
297 extern gint tvb_reported_length_remaining(tvbuff_t *tvb, gint offset);
299 /** Set the reported length of a tvbuff to a given value; used for protocols
300 whose headers contain an explicit length and where the calling
301 dissector's payload may include padding as well as the packet for
304 Also adjusts the data length. */
305 extern void tvb_set_reported_length(tvbuff_t*, guint);
307 extern guint tvb_offset_from_real_beginning(tvbuff_t *tvb);
309 /* Returns the offset from the first byte of real data. */
310 #define TVB_RAW_OFFSET(tvb) \
311 ((tvb->raw_offset==-1)?(tvb->raw_offset = tvb_offset_from_real_beginning(tvb)):tvb->raw_offset)
313 /************** START OF ACCESSORS ****************/
314 /* All accessors will throw an exception if appropriate */
316 extern guint8 tvb_get_guint8(tvbuff_t*, gint offset);
318 extern guint16 tvb_get_ntohs(tvbuff_t*, gint offset);
319 extern guint32 tvb_get_ntoh24(tvbuff_t*, gint offset);
320 extern guint32 tvb_get_ntohl(tvbuff_t*, gint offset);
321 extern guint64 tvb_get_ntoh64(tvbuff_t*, gint offset);
322 extern gfloat tvb_get_ntohieee_float(tvbuff_t*, gint offset);
323 extern gdouble tvb_get_ntohieee_double(tvbuff_t*, gint offset);
325 extern guint16 tvb_get_letohs(tvbuff_t*, gint offset);
326 extern guint32 tvb_get_letoh24(tvbuff_t*, gint offset);
327 extern guint32 tvb_get_letohl(tvbuff_t*, gint offset);
328 extern guint64 tvb_get_letoh64(tvbuff_t*, gint offset);
329 extern gfloat tvb_get_letohieee_float(tvbuff_t*, gint offset);
330 extern gdouble tvb_get_letohieee_double(tvbuff_t*, gint offset);
333 * Fetch an IPv4 address, in network byte order.
334 * We do *not* convert it to host byte order; we leave it in
335 * network byte order, as that's what its callers expect. */
336 extern guint32 tvb_get_ipv4(tvbuff_t*, gint offset);
338 /* Fetch an IPv6 address. */
339 extern void tvb_get_ipv6(tvbuff_t*, gint offset, struct e_in6_addr *addr);
342 extern void tvb_get_ntohguid(tvbuff_t *tvb, gint offset, e_guid_t *guid);
343 extern void tvb_get_letohguid(tvbuff_t *tvb, gint offset, e_guid_t *guid);
344 extern void tvb_get_guid(tvbuff_t *tvb, gint offset, e_guid_t *guid, gboolean little_endian);
346 /* Fetch a specified number of bits from bit offset in a tvb */
347 extern guint8 tvb_get_bits8(tvbuff_t *tvb, gint bit_offset, gint no_of_bits);
348 extern guint16 tvb_get_bits16(tvbuff_t *tvb, gint bit_offset, gint no_of_bits, gboolean little_endian);
349 extern guint32 tvb_get_bits32(tvbuff_t *tvb, gint bit_offset, gint no_of_bits, gboolean little_endian);
350 extern guint64 tvb_get_bits64(tvbuff_t *tvb, gint bit_offset, gint no_of_bits, gboolean little_endian);
352 /** Returns target for convenience. Does not suffer from possible
353 * expense of tvb_get_ptr(), since this routine is smart enough
354 * to copy data in chunks if the request range actually exists in
355 * different TVBUFF_REAL_DATA tvbuffs. This function assumes that the
356 * target memory is already allocated; it does not allocate or free the
358 extern void* tvb_memcpy(tvbuff_t*, void* target, gint offset, size_t length);
360 /** It is the user's responsibility to g_free() the memory allocated by
361 * tvb_memdup(). Calls tvb_memcpy() */
362 extern void* tvb_memdup(tvbuff_t*, gint offset, size_t length);
364 /* Same as above but the buffer returned from this function does not have to
365 * be freed. It will be automatically freed after the packet is dissected.
366 * Buffers allocated by this function are NOT persistent.
368 extern void* ep_tvb_memdup(tvbuff_t *tvb, gint offset, size_t length);
370 /** WARNING! This function is possibly expensive, temporarily allocating
371 * another copy of the packet data. Furthermore, it's dangerous because once
372 * this pointer is given to the user, there's no guarantee that the user will
373 * honor the 'length' and not overstep the boundaries of the buffer.
375 * If you're thinking of using tvb_get_ptr, STOP WHAT YOU ARE DOING
376 * IMMEDIATELY. Go take a break. Consider that tvb_get_ptr hands you
377 * a raw, unprotected pointer that you can easily use to create a
378 * security vulnerability or otherwise crash Wireshark. Then consider
379 * that you can probably find a function elsewhere in this file that
380 * does exactly what you want in a much more safe and robust manner.
382 * The returned pointer is data that is internal to the tvbuff, so do not
383 * attempt to free it. Don't modify the data, either, because another tvbuff
384 * that might be using this tvbuff may have already copied that portion of
385 * the data (sometimes tvbuff's need to make copies of data, but that's the
386 * internal implementation that you need not worry about). Assume that the
387 * guint8* points to read-only data that the tvbuff manages.
389 * Return a pointer into our buffer if the data asked for via 'offset'/'length'
390 * is contiguous (which might not be the case for TVBUFF_COMPOSITE). If the
391 * data is not contiguous, a tvb_memdup() is called for the entire buffer
392 * and the pointer to the newly-contiguous data is returned. This dynamically-
393 * allocated memory will be freed when the tvbuff is freed, after the
394 * tvbuff_free_cb_t() is called, if any. */
395 extern const guint8* tvb_get_ptr(tvbuff_t*, gint offset, gint length);
397 /** Find first occurence of any of the needles in tvbuff, starting at offset.
398 * Searches at most maxlength number of bytes; if maxlength is -1, searches
400 * Returns the offset of the found needle, or -1 if not found.
401 * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
402 * in that case, -1 will be returned if the boundary is reached before
404 extern gint tvb_find_guint8(tvbuff_t*, gint offset, gint maxlength,
407 /** Find first occurence of any of the needles in tvbuff, starting at offset.
408 * Searches at most maxlength number of bytes. Returns the offset of the
409 * found needle, or -1 if not found. Will not throw an exception, even if
410 * maxlength exceeds boundary of tvbuff; in that case, -1 will be returned if
411 * the boundary is reached before finding needle. */
412 extern gint tvb_pbrk_guint8(tvbuff_t *, gint offset, gint maxlength,
413 const guint8 *needles);
415 /** Find size of stringz (NUL-terminated string) by looking for terminating
416 * NUL. The size of the string includes the terminating NUL.
418 * If the NUL isn't found, it throws the appropriate exception.
420 extern guint tvb_strsize(tvbuff_t *tvb, gint offset);
422 /** Find length of string by looking for end of zero terminated string, up to
423 * 'maxlength' characters'; if 'maxlength' is -1, searches to end
425 * Returns -1 if 'maxlength' reached before finding EOS. */
426 extern gint tvb_strnlen(tvbuff_t*, gint offset, guint maxlength);
428 /** Convert a string from Unicode to ASCII. At the moment we fake it by
429 * assuming all characters are ASCII )-: The len parameter is the number
430 * of guint16's to convert from Unicode.
432 * tvb_fake_unicode() returns a buffer allocated by g_malloc() and must
433 * be g_free() by the caller.
434 * tvb_get_ephemeral_faked_unicode() returns a buffer that does not need
435 * to be explicitely freed. Instead this buffer is
436 * automatically freed when wireshark starts dissecting
439 extern char *tvb_fake_unicode(tvbuff_t *tvb, int offset, int len,
440 gboolean little_endian);
441 extern char *tvb_get_ephemeral_faked_unicode(tvbuff_t *tvb, int offset, int len,
442 gboolean little_endian);
445 * Format the data in the tvb from offset for size ...
447 extern gchar * tvb_format_text(tvbuff_t *tvb, gint offset, gint size);
450 * Like "tvb_format_text()", but for 'wsp'; don't show
451 * the characters as C-style escapes.
453 extern gchar * tvb_format_text_wsp(tvbuff_t *tvb, gint offset, gint size);
456 * Like "tvb_format_text()", but for null-padded strings; don't show
457 * the null padding characters as "\000".
459 extern gchar *tvb_format_stringzpad(tvbuff_t *tvb, gint offset, gint size);
462 * Like "tvb_format_text_wsp()", but for null-padded strings; don't show
463 * the null padding characters as "\000".
465 extern gchar *tvb_format_stringzpad_wsp(tvbuff_t *tvb, gint offset, gint size);
469 * Given a tvbuff, an offset, and a length, allocate a buffer big enough
470 * to hold a non-null-terminated string of that length at that offset,
471 * plus a trailing zero, copy the string into it, and return a pointer
474 * Throws an exception if the tvbuff ends before the string does.
476 * tvb_get_string() returns a string allocated by g_malloc() and therefore
477 * MUST be g_free() by the caller in order not to leak
480 * tvb_get_ephemeral_string() returns a string that does not need to be freed,
481 * instead it will automatically be freed once the next
482 * packet is dissected.
484 * tvb_get_seasonal_string() returns a string that does not need to be freed,
485 * instead it will automatically be freed when a new capture
488 extern guint8 *tvb_get_string(tvbuff_t *tvb, gint offset, gint length);
489 extern guint8 *tvb_get_ephemeral_string(tvbuff_t *tvb, gint offset, gint length);
490 extern guint8 *tvb_get_seasonal_string(tvbuff_t *tvb, gint offset, gint length);
494 * Given a tvbuff and an offset, with the offset assumed to refer to
495 * a null-terminated string, find the length of that string (and throw
496 * an exception if the tvbuff ends before we find the null), allocate
497 * a buffer big enough to hold the string, copy the string into it,
498 * and return a pointer to the string. Also return the length of the
499 * string (including the terminating null) through a pointer.
501 * tvb_get_stringz() returns a string allocated by g_malloc() and therefore
502 * MUST be g_free() by the caller in order not to leak
505 * tvb_get_ephemeral_stringz() returns a string that does not need to be freed,
506 * instead it will automatically be freed once the next
507 * packet is dissected.
509 * tvb_get_seasonal_stringz() returns a string that does not need to be freed,
510 * instead it will automatically be freed when a new capture
513 extern guint8 *tvb_get_stringz(tvbuff_t *tvb, gint offset, gint *lengthp);
514 extern guint8 *tvb_get_ephemeral_stringz(tvbuff_t *tvb, gint offset, gint *lengthp);
515 extern guint8 *tvb_get_seasonal_stringz(tvbuff_t *tvb, gint offset, gint *lengthp);
517 /** Looks for a stringz (NUL-terminated string) in tvbuff and copies
518 * no more than bufsize number of bytes, including terminating NUL, to buffer.
519 * Returns length of string (not including terminating NUL), or -1 if the string was
520 * truncated in the buffer due to not having reached the terminating NUL.
521 * In this way, it acts like g_snprintf().
523 * When processing a packet where the remaining number of bytes is less
524 * than bufsize, an exception is not thrown if the end of the packet
525 * is reached before the NUL is found. If no NUL is found before reaching
526 * the end of the short packet, -1 is still returned, and the string
527 * is truncated with a NUL, albeit not at buffer[bufsize - 1], but
528 * at the correct spot, terminating the string.
530 extern gint tvb_get_nstringz(tvbuff_t *tvb, gint offset, guint bufsize,
533 /** Like tvb_get_nstringz(), but never returns -1. The string is guaranteed to
534 * have a terminating NUL. If the string was truncated when copied into buffer,
535 * a NUL is placed at the end of buffer to terminate it.
537 * bufsize MUST be greater than 0.
539 extern gint tvb_get_nstringz0(tvbuff_t *tvb, gint offset, guint bufsize,
543 * Given a tvbuff, an offset into the tvbuff, and a length that starts
544 * at that offset (which may be -1 for "all the way to the end of the
545 * tvbuff"), find the end of the (putative) line that starts at the
546 * specified offset in the tvbuff, going no further than the specified
549 * Return the length of the line (not counting the line terminator at
550 * the end), or, if we don't find a line terminator:
552 * if "deseg" is true, return -1;
554 * if "deseg" is false, return the amount of data remaining in
557 * Set "*next_offset" to the offset of the character past the line
558 * terminator, or past the end of the buffer if we don't find a line
559 * terminator. (It's not set if we return -1.)
561 extern gint tvb_find_line_end(tvbuff_t *tvb, gint offset, int len,
562 gint *next_offset, gboolean desegment);
565 * Given a tvbuff, an offset into the tvbuff, and a length that starts
566 * at that offset (which may be -1 for "all the way to the end of the
567 * tvbuff"), find the end of the (putative) line that starts at the
568 * specified offset in the tvbuff, going no further than the specified
571 * However, treat quoted strings inside the buffer specially - don't
572 * treat newlines in quoted strings as line terminators.
574 * Return the length of the line (not counting the line terminator at
575 * the end), or the amount of data remaining in the buffer if we don't
576 * find a line terminator.
578 * Set "*next_offset" to the offset of the character past the line
579 * terminator, or past the end of the buffer if we don't find a line
582 extern gint tvb_find_line_end_unquoted(tvbuff_t *tvb, gint offset, int len,
586 * Copied from the mgcp dissector. (This function should be moved to /epan )
587 * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
588 * character following offset or offset + maxlength -1 whichever
592 * tvb - The tvbuff in which we are skipping whitespace.
593 * offset - The offset in tvb from which we begin trying to skip whitespace.
594 * maxlength - The maximum distance from offset that we may try to skip
597 * Returns: The position in tvb of the first non-whitespace
598 * character following offset or offset + maxlength -1 whichever
602 extern gint tvb_skip_wsp(tvbuff_t* tvb, gint offset, gint maxlength);
604 extern gint tvb_skip_wsp_return(tvbuff_t* tvb, gint offset);
607 * Call strncmp after checking if enough chars left, returning 0 if
608 * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
610 extern gint tvb_strneql(tvbuff_t *tvb, gint offset, const gchar *str,
614 * Call g_ascii_strncasecmp after checking if enough chars left, returning
615 * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
617 extern gint tvb_strncaseeql(tvbuff_t *tvb, gint offset, const gchar *str,
621 * Call memcmp after checking if enough chars left, returning 0 if
622 * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
624 extern gint tvb_memeql(tvbuff_t *tvb, gint offset, const guint8 *str,
628 * Format a bunch of data from a tvbuff as bytes, returning a pointer
629 * to the string with the formatted data, with "punct" as a byte
632 extern gchar *tvb_bytes_to_str_punct(tvbuff_t *tvb, gint offset, gint len,
636 * Format a bunch of data from a tvbuff as bytes, returning a pointer
637 * to the string with the formatted data.
639 extern gchar *tvb_bytes_to_str(tvbuff_t *tvb, gint offset, gint len);
641 #define TVB_GET_DS_TVB(tvb) \
644 /** Locate a sub-tvbuff within another tvbuff, starting at position
645 * 'haystack_offset'. Returns the index of the beginning of 'needle' within
646 * 'haystack', or -1 if 'needle' is not found. The index is relative
647 * to the start of 'haystack', not 'haystack_offset'. */
648 extern gint tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb,
649 gint haystack_offset);
652 * Uncompresses a zlib compressed packet inside a tvbuff at offset with
653 * length comprlen. Returns an uncompressed tvbuffer if uncompression
654 * succeeded or NULL if uncompression failed.
656 extern tvbuff_t* tvb_uncompress(tvbuff_t *tvb, int offset, int comprlen);
659 * Uncompresses a zlib compressed packet inside a tvbuff at offset with
660 * length comprlen. Returns an uncompressed tvbuffer attached to tvb if uncompression
661 * succeeded or NULL if uncompression failed.
663 extern tvbuff_t* tvb_child_uncompress(tvbuff_t *parent, tvbuff_t *tvb, int offset, int comprlen);
665 /************** END OF ACCESSORS ****************/
667 #endif /* __TVBUFF_H__ */