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/* crc16.h
* Declaration of CRC-16 routines and table
*
* 2004 Richard van der Hoff <richardv@mxtelecom.com>
*
* 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 __CRC16_H__
#define __CRC16_H__
#include "ws_symbol_export.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Calculate the CCITT/ITU/CRC-16 16-bit CRC
(parameters for this CRC are:
Polynomial: x^16 + x^12 + x^5 + 1 (0x1021);
Start value 0xFFFF;
XOR result with 0xFFFF;
First bit is LSB)
*/
/** Compute CRC16 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 CRC16 CCITT checksum. */
WS_DLL_PUBLIC guint16 crc16_ccitt(const guint8 *buf, guint len);
/** Compute CRC16 X.25 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 CRC16 X.25 CCITT checksum. */
WS_DLL_PUBLIC guint16 crc16_x25_ccitt_seed(const guint8 *buf, guint len, guint16 seed);
/** Compute CRC16 CCITT checksum of a buffer of data. If computing the
* checksum over multiple buffers and you want to feed the partial CRC16
* back in, remember to take the 1's complement of the partial CRC16 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 CRC16 CCITT checksum (using the given seed). */
WS_DLL_PUBLIC guint16 crc16_ccitt_seed(const guint8 *buf, guint len, guint16 seed);
/** Compute the 16bit CRC_A value of a buffer as defined in ISO14443-3.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@return the CRC16 checksum for the buffer */
WS_DLL_PUBLIC guint16 crc16_iso14443a(const guint8 *buf, guint len);
/** Calculates a CRC16 checksum for the given buffer with the polynom
* 0x5935 using a 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 CRC16 checksum for the buffer
*/
WS_DLL_PUBLIC guint16 crc16_0x5935(const guint8 *buf, guint32 len, guint16 seed);
/** Calculates a CRC16 checksum for the given buffer with the polynom
* 0x755B using a 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 CRC16 checksum for the buffer
*/
WS_DLL_PUBLIC guint16 crc16_0x755B(const guint8 *buf, guint32 len, guint16 seed);
/** Computes CRC16 checksum for the given data with the polynom 0x9949 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 CRC16 checksum for the buffer
*/
WS_DLL_PUBLIC guint16 crc16_0x9949_seed(const guint8 *buf, guint len, guint16 seed);
/** Computes CRC16 checksum for the given data with the polynom 0x3D65 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 CRC16 checksum for the buffer
*/
WS_DLL_PUBLIC guint16 crc16_0x3D65_seed(const guint8 *buf, guint len, guint16 seed);
/** Computes CRC16 checksum for the given data with the polynom 0x080F 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 CRC16 checksum for the buffer
*/
WS_DLL_PUBLIC guint16 crc16_0x080F_seed(const guint8 *buf, guint len, guint16 seed);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* crc16.h */
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