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/* crc32.h
* Declaration of CRC-32 routine and table
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __CRC32_H__
#define __CRC32_H__
#include "ws_symbol_export.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define CRC32_CCITT_SEED 0xFFFFFFFF
#define CRC32C_PRELOAD 0xffffffff
#define CRC32_MPEG2_SEED 0xFFFFFFFF
/*
* Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>.
*/
#define CRC32C_SWAP(crc32c_value) \
(((crc32c_value & 0xff000000) >> 24) | \
((crc32c_value & 0x00ff0000) >> 8) | \
((crc32c_value & 0x0000ff00) << 8) | \
((crc32c_value & 0x000000ff) << 24))
/** Lookup the crc value in the crc32_ccitt_table
@param pos Position in the table. */
WS_DLL_PUBLIC guint32 crc32_ccitt_table_lookup (guchar pos);
/** Lookup the crc value in the crc32c_table
@param pos Position in the table. */
WS_DLL_PUBLIC guint32 crc32c_table_lookup (guchar pos);
/** Compute CRC32C checksum of a buffer of data.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param crc The preload value for the CRC32C computation.
@return The CRC32C checksum. */
WS_DLL_PUBLIC guint32 crc32c_calculate(const void *buf, int len, guint32 crc);
/** Compute CRC32C checksum of a buffer of data without swapping seed crc
or completed checksum
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param crc The preload value for the CRC32C computation.
@return The CRC32C checksum. */
WS_DLL_PUBLIC guint32 crc32c_calculate_no_swap(const void *buf, int len, guint32 crc);
/** 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. */
WS_DLL_PUBLIC 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). */
WS_DLL_PUBLIC guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
/** Compute MPEG-2 CRC32 checksum of a buffer of data.
@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 MPEG-2 checksum (using the given seed). */
WS_DLL_PUBLIC guint32 crc32_mpeg2_seed(const guint8 *buf, guint len, guint32 seed);
/** Computes CRC32 checksum for the given data with the polynom 0x0AA725CF using
* precompiled CRC table
* @param buf a pointer to a buffer of the given length
* @param len the length of the given buffer
* @param seed The seed to use.
* @return the CRC32 checksum for the buffer
*/
WS_DLL_PUBLIC guint32 crc32_0x0AA725CF_seed(const guint8 *buf, guint len, guint32 seed);
WS_DLL_PUBLIC int AirPDcapWepDecrypt(
const guchar *seed,
const size_t seed_len,
guchar *cypher_text,
const size_t data_len);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* crc32.h */