forked from osmocom/wireshark
![Stig Bjørlykke](/assets/img/avatar_default.png)
Merge of the CRC32C calculation out of packet-iscsi.c and packet-sctp.c into the already existing crc32.c and crc32.h files. svn path=/trunk/; revision=24930
117 lines
4.5 KiB
C
117 lines
4.5 KiB
C
/* crc32.h
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* Declaration of CRC-32 routine and table
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from README.developer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __CRC32_H_
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#define __CRC32_H_
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define CRC32C_PRELOAD 0xffffffff
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/*
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* Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>.
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*/
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#define CRC32C_SWAP(crc32c_value) \
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(((crc32c_value & 0xff000000) >> 24) | \
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((crc32c_value & 0x00ff0000) >> 8) | \
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((crc32c_value & 0x0000ff00) << 8) | \
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((crc32c_value & 0x000000ff) << 24))
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#define CRC32C(c,d) (c=(c>>8)^crc32c_table[(c^(d))&0xFF])
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extern const guint32 crc32c_table[256];
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/** Compute CRC32C checksum of a buffer of data.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@param crc The preload value for the CRC32C computation.
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@return The CRC32C checksum. */
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extern guint32 calculate_crc32c(const void *buf, int len, guint32 crc);
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extern const guint32 crc32_ccitt_table[256];
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/** Compute CRC32 CCITT checksum of a buffer of data.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return The CRC32 CCITT checksum. */
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extern guint32 crc32_ccitt(const guint8 *buf, guint len);
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/** Compute CRC32 CCITT checksum of a buffer of data. If computing the
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* checksum over multiple buffers and you want to feed the partial CRC32
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* back in, remember to take the 1's complement of the partial CRC32 first.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@param seed The seed to use.
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@return The CRC32 CCITT checksum (using the given seed). */
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extern guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
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/** Compute CRC32 CCITT checksum of a tv buffer.
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@param tvb The tv buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return The CRC32 CCITT checksum. */
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extern guint32 crc32_ccitt_tvb(tvbuff_t *tvb, guint len);
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/** Compute CRC32 CCITT checksum of a tv buffer.
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@param tvb The tv buffer containing the data.
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@param offset The offset into the tv buffer.
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@param len The number of bytes to include in the computation.
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@return The CRC32 CCITT checksum. */
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extern guint32 crc32_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
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/** Compute CRC32 CCITT checksum of a tv buffer. If computing the
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* checksum over multiple tv buffers and you want to feed the partial CRC32
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* back in, remember to take the 1's complement of the partial CRC32 first.
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@param tvb The tv buffer containing the data.
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@param len The number of bytes to include in the computation.
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@param seed The seed to use.
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@return The CRC32 CCITT checksum (using the given seed). */
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extern guint32 crc32_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint32 seed);
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/** Compute CRC32 CCITT checksum of a tv buffer. If computing the
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* checksum over multiple tv buffers and you want to feed the partial CRC32
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* back in, remember to take the 1's complement of the partial CRC32 first.
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@param tvb The tv buffer containing the data.
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@param offset The offset into the tv buffer.
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@param len The number of bytes to include in the computation.
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@param seed The seed to use.
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@return The CRC32 CCITT checksum (using the given seed). */
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extern guint32 crc32_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset,
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guint len, guint32 seed);
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/** Compute IEEE 802.x CRC32 checksum of a tv buffer.
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@param tvb The tv buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return The IEEE 802.x CRC32 checksum. */
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extern guint32 crc32_802_tvb(tvbuff_t *tvb, guint len);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* crc32.h */
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