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/* crc16-tvb.c
* CRC-16 tvb routines
*
* 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.
*
* References:
* "A Painless Guide to CRC Error Detection Algorithms", Ross Williams
* http://www.repairfaq.org/filipg/LINK/F_crc_v3.html
*
* ITU-T Recommendation V.42 (2002), "Error-Correcting Procedures for
* DCEs using asynchronous-to-synchronous conversion", Para. 8.1.1.6.1
*/
#include "config.h"
#include <glib.h>
#include <epan/tvbuff.h>
#include <wsutil/crc16.h>
#include <epan/crc16-tvb.h>
#include <wsutil/crc16-plain.h>
guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, 0, len);
return crc16_ccitt(buf, len);
}
guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, 0, len);
return crc16_x25_ccitt(buf, len);
}
guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, offset, len);
return crc16_ccitt(buf, len);
}
guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, 0, len);
return crc16_ccitt_seed(buf, len, seed);
}
guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, offset, len);
return crc16_ccitt_seed(buf, len, seed);
}
guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
{
guint16 crc = crc16_plain_init();
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, offset, len);
crc = crc16_plain_update(crc, buf, len);
return crc16_plain_finalize(crc);
}
guint16 crc16_plain_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 crc)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, offset, len);
crc = crc16_plain_update(crc, buf, len);
return crc16_plain_finalize(crc);
}
guint16 crc16_0x9949_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
{
const guint8 *buf;
tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
buf = tvb_get_ptr(tvb, offset, len);
return crc16_0x9949_seed(buf, len, seed);
}
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