forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
add versions of CRC-16 and CRC-32 routines with seed arguments; add versions of those routines with an "offset in the tvbuff" argument; add Doxygen comments to the CRC-16 and CRC-32 headers. svn path=/trunk/; revision=11573
83 lines
3.6 KiB
C
83 lines
3.6 KiB
C
/* crc32.h
|
|
* Declaration of CRC-32 routine and table
|
|
*
|
|
* $Id$
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* Copied from README.developer
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
extern const guint32 crc32_ccitt_table[256];
|
|
|
|
/** Compute CRC32 CCITT checksum of a buffer of data.
|
|
@param buf The buffer containing the data.
|
|
@param len The number of bytes to include in the computation.
|
|
@return The CRC32 CCITT checksum. */
|
|
extern guint32 crc32_ccitt(const guint8 *buf, guint len);
|
|
|
|
/** Compute CRC32 CCITT checksum of a buffer of data. If computing the
|
|
* checksum over multiple buffers and you want to feed the partial CRC32
|
|
* back in, remember to take the 1's complement of the partial CRC32 first.
|
|
@param buf The buffer containing the data.
|
|
@param len The number of bytes to include in the computation.
|
|
@param seed The seed to use.
|
|
@return The CRC32 CCITT checksum (using the given seed). */
|
|
extern guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
|
|
|
|
/** Compute CRC32 CCITT checksum of a tv buffer.
|
|
@param tvb The tv buffer containing the data.
|
|
@param len The number of bytes to include in the computation.
|
|
@return The CRC32 CCITT checksum. */
|
|
extern guint32 crc32_ccitt_tvb(tvbuff_t *tvb, guint len);
|
|
|
|
/** Compute CRC32 CCITT checksum of a tv buffer.
|
|
@param tvb The tv buffer containing the data.
|
|
@param offset The offset into the tv buffer.
|
|
@param len The number of bytes to include in the computation.
|
|
@return The CRC32 CCITT checksum. */
|
|
extern guint32 crc32_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
|
|
|
|
/** Compute CRC32 CCITT checksum of a tv buffer. If computing the
|
|
* checksum over multiple tv buffers and you want to feed the partial CRC32
|
|
* back in, remember to take the 1's complement of the partial CRC32 first.
|
|
@param tvb The tv buffer containing the data.
|
|
@param len The number of bytes to include in the computation.
|
|
@param seed The seed to use.
|
|
@return The CRC32 CCITT checksum (using the given seed). */
|
|
extern guint32 crc32_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint32 seed);
|
|
|
|
/** Compute CRC32 CCITT checksum of a tv buffer. If computing the
|
|
* checksum over multiple tv buffers and you want to feed the partial CRC32
|
|
* back in, remember to take the 1's complement of the partial CRC32 first.
|
|
@param tvb The tv buffer containing the data.
|
|
@param offset The offset into the tv buffer.
|
|
@param len The number of bytes to include in the computation.
|
|
@param seed The seed to use.
|
|
@return The CRC32 CCITT checksum (using the given seed). */
|
|
extern guint32 crc32_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset,
|
|
guint len, guint32 seed);
|
|
|
|
/** Compute IEEE 802.x CRC32 checksum of a tv buffer.
|
|
@param tvb The tv buffer containing the data.
|
|
@param len The number of bytes to include in the computation.
|
|
@return The IEEE 802.x CRC32 checksum. */
|
|
extern guint32 crc32_802_tvb(tvbuff_t *tvb, guint len);
|
|
|