95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
/* crc16-tvb.h
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* Declaration of CRC-16 tvbuff routines
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*
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* 2004 Richard van der Hoff <richardv@mxtelecom.com>
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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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __CRC16_TVB_H__
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#define __CRC16_TVB_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/** Compute CRC16 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 CRC16 CCITT checksum. */
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extern guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len);
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/** Compute CRC16 X.25 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 CRC16 X.25 CCITT checksum. */
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extern guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len);
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/** Compute CRC16 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 CRC16 CCITT checksum. */
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extern guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
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/** Compute CRC16 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 CRC16
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* back in, remember to take the 1's complement of the partial CRC16 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 CRC16 CCITT checksum (using the given seed). */
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extern guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed);
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/** Compute CRC16 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 CRC16
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* back in, remember to take the 1's complement of the partial CRC16 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 CRC16 CCITT checksum (using the given seed). */
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extern guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset,
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guint len, guint16 seed);
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/** Compute the "plain" CRC16 checksum of a tv buffer using the following
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* parameters:
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* Width = 16
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* Poly = 0x8005
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* XorIn = 0x0000
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* ReflectIn = True
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* XorOut = 0x0000
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* ReflectOut = True
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* Algorithm = table-driven
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* Direct = True
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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 CRC16 checksum. */
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extern guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* crc16-tvb.h */
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