forked from osmocom/wireshark
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/* crc16-tvb.c
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* CRC-16 tvb 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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* 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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* References:
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* "A Painless Guide to CRC Error Detection Algorithms", Ross Williams
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* http://www.repairfaq.org/filipg/LINK/F_crc_v3.html
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*
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* ITU-T Recommendation V.42 (2002), "Error-Correcting Procedures for
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* DCEs using asynchronous-to-synchronous conversion", Para. 8.1.1.6.1
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/tvbuff.h>
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#include <wsutil/crc16.h>
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#include <epan/crc16-tvb.h>
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#include <wsutil/crc16-plain.h>
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guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, 0, len);
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return crc16_ccitt(buf, len);
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}
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guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, 0, len);
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return crc16_x25_ccitt_seed(buf, len, 0xFFFF);
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}
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guint16 crc16_r3_ccitt_tvb(tvbuff_t *tvb, int offset, guint len)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_x25_ccitt_seed(buf, len, 0);
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}
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guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_ccitt(buf, len);
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}
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guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, 0, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, 0, len);
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return crc16_ccitt_seed(buf, len, seed);
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}
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guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_ccitt_seed(buf, len, seed);
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}
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guint16 crc16_iso14443a_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_iso14443a(buf, len);
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}
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guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
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{
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guint16 crc = crc16_plain_init();
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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crc = crc16_plain_update(crc, buf, len);
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return crc16_plain_finalize(crc);
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}
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guint16 crc16_plain_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 crc)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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crc = crc16_plain_update(crc, buf, len);
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return crc16_plain_finalize(crc);
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}
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guint16 crc16_0x9949_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_0x9949_seed(buf, len, seed);
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}
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guint16 crc16_0x3D65_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
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{
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const guint8 *buf;
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tvb_ensure_bytes_exist(tvb, offset, len); /* len == -1 not allowed */
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buf = tvb_get_ptr(tvb, offset, len);
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return crc16_0x3D65_seed(buf, len, seed);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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