forked from osmocom/wireshark
107 lines
3.7 KiB
C
107 lines
3.7 KiB
C
/** @file
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* Declaration of CRC-32 routine and table
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __CRC32_H__
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#define __CRC32_H__
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#include "ws_symbol_export.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define CRC32_CCITT_SEED 0xFFFFFFFF
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#define CRC32C_PRELOAD 0xffffffff
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#define CRC32_MPEG2_SEED 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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/** Lookup the crc value in the crc32_ccitt_table
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@param pos Position in the table. */
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WS_DLL_PUBLIC guint32 crc32_ccitt_table_lookup (guchar pos);
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/** Lookup the crc value in the crc32c_table
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@param pos Position in the table. */
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WS_DLL_PUBLIC guint32 crc32c_table_lookup (guchar pos);
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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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WS_DLL_PUBLIC guint32 crc32c_calculate(const void *buf, int len, guint32 crc);
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/** Compute CRC32C checksum of a buffer of data without swapping seed crc
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or completed checksum
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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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WS_DLL_PUBLIC guint32 crc32c_calculate_no_swap(const void *buf, int len, guint32 crc);
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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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WS_DLL_PUBLIC 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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WS_DLL_PUBLIC guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
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/** Compute MPEG-2 CRC32 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 seed The seed to use.
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@return The CRC32 MPEG-2 checksum (using the given seed). */
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WS_DLL_PUBLIC guint32 crc32_mpeg2_seed(const guint8 *buf, guint len, guint32 seed);
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/** Computes CRC32 checksum for the given data with the polynom 0x0AA725CF using
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* precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC32 checksum for the buffer
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*/
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WS_DLL_PUBLIC guint32 crc32_0x0AA725CF_seed(const guint8 *buf, guint len, guint32 seed);
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/** Computes CRC32 checksum for the given data with the polynom 0x5D6DCB using
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* precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC32 checksum for the buffer
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*/
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WS_DLL_PUBLIC guint32 crc32_0x5D6DCB_seed(const guint8 *buf, guint len, guint32 seed);
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WS_DLL_PUBLIC int Dot11DecryptWepDecrypt(
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const guchar *seed,
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const size_t seed_len,
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guchar *cypher_text,
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const size_t data_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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