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/* crc16.h
* Declaration of CRC-16 routines and table
*
* 2004 Richard van der Hoff <richardv@mxtelecom.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@xxxxxxxxxxxx>
* 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.
*/
#ifndef __CRC16_H_
#define __CRC16_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. */
extern 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. */
extern guint16 crc16_x25_ccitt(const guint8 *buf, guint len);
/** 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). */
extern guint16 crc16_ccitt_seed(const guint8 *buf, guint len, guint16 seed);
/** Compute CRC16 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 CRC16 CCITT checksum. */
extern guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len);
/** Compute CRC16 X.25 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 CRC16 X.25 CCITT checksum. */
extern guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len);
/** Compute CRC16 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 CRC16 CCITT checksum. */
extern guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
/** Compute CRC16 CCITT checksum of a tv buffer. If computing the
* checksum over multiple tv buffers and you want to feed the partial CRC16
* back in, remember to take the 1's complement of the partial CRC16 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 CRC16 CCITT checksum (using the given seed). */
extern guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed);
/** Compute CRC16 CCITT checksum of a tv buffer. If computing the
* checksum over multiple tv buffers and you want to feed the partial CRC16
* back in, remember to take the 1's complement of the partial CRC16 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 CRC16 CCITT checksum (using the given seed). */
extern guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset,
guint len, guint16 seed);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* crc16.h */
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