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/** @file
* Declaration of CRC-16 tvbuff routines
*
* 2004 Richard van der Hoff <richardv@mxtelecom.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __CRC16_TVB_H__
#define __CRC16_TVB_H__
#include "ws_symbol_export.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** 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. */
WS_DLL_PUBLIC 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. */
WS_DLL_PUBLIC guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len);
/** Compute CRC16 ASSA R3 CCITT checksum of a tv buffer.
@param tvb The tv buffer containing the data.
@param offset The offset into tv 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_r3_ccitt_tvb(tvbuff_t *tvb, int offset, 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. */
WS_DLL_PUBLIC 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). */
WS_DLL_PUBLIC 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). */
WS_DLL_PUBLIC guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset,
guint len, guint16 seed);
/** Compute the 16bit CRC_A value of a tv buffer as defined in ISO14443-3.
@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 calculated CRC_A. */
WS_DLL_PUBLIC guint16 crc16_iso14443a_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
/** Compute the 16bit CRC value of a tv buffer as defined in USB Standard.
@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 calculated CRC. */
WS_DLL_PUBLIC guint16 crc16_usb_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
/** Compute the "plain" CRC16 checksum of a tv buffer using the following
* parameters:
* Width = 16
* Poly = 0x8005
* XorIn = 0x0000
* ReflectIn = True
* XorOut = 0x0000
* ReflectOut = True
* Algorithm = table-driven
* Direct = True
@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 checksum. */
WS_DLL_PUBLIC guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len);
/** Compute the "plain" CRC16 checksum of a tv buffer using the following
* parameters:
* Width = 16
* Poly = 0x8005
* XorIn = 0x0000
* ReflectIn = True
* XorOut = 0x0000
* ReflectOut = True
* Algorithm = table-driven
* Direct = True
@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 crc Starting CRC value
@return The CRC16 checksum. */
WS_DLL_PUBLIC guint16 crc16_plain_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 crc);
/** Compute CRC16 checksum of a tv buffer using the parameters
* Width = 16 bits
* Poly = 0x9949
* Reflection = true
* Algorithm = table-driven
@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 checksum. */
WS_DLL_PUBLIC guint16 crc16_0x9949_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed);
/** Compute CRC16 checksum of a tv buffer using the parameters
* Width = 16 bits
* Poly = 0x3D65
* Reflection = true
* Algorithm = table-driven
@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 checksum. */
WS_DLL_PUBLIC guint16 crc16_0x3D65_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* crc16-tvb.h */
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