crc16.h File Reference

#include <wireshark.h>

Go to the source code of this file.

Functions
WS_DLL_PUBLIC uint16_t	crc16_ccitt (const uint8_t *buf, unsigned len)
WS_DLL_PUBLIC uint16_t	crc16_x25_ccitt_seed (const uint8_t *buf, unsigned len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_ccitt_seed (const uint8_t *buf, unsigned len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_iso14443a (const uint8_t *buf, unsigned len)
WS_DLL_PUBLIC uint16_t	crc16_usb (const uint8_t *buf, unsigned len)
WS_DLL_PUBLIC uint16_t	crc16_0x5935 (const uint8_t *buf, uint32_t len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_0x755B (const uint8_t *buf, uint32_t len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_0x9949_seed (const uint8_t *buf, unsigned len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_0x3D65_seed (const uint8_t *buf, unsigned len, uint16_t seed)
WS_DLL_PUBLIC uint16_t	crc16_0x080F_seed (const uint8_t *buf, unsigned len, uint16_t seed)

Detailed Description

Declaration of CRC-16 routines and table

2004 Richard van der Hoff richa.nosp@m.rdv@.nosp@m.mxtel.nosp@m.ecom.nosp@m..com

Wireshark - Network traffic analyzer By Gerald Combs geral.nosp@m.d@wi.nosp@m.resha.nosp@m.rk.o.nosp@m.rg Copyright 1998 Gerald Combs

SPDX-License-Identifier: GPL-2.0-or-later

Function Documentation

crc16_0x080F_seed()

WS_DLL_PUBLIC uint16_t crc16_0x080F_seed	(	const uint8_t *	buf,
		unsigned	len,
		uint16_t	seed
	)

Computes CRC16 checksum for the given data with the polynom 0x080F using precompiled CRC table

Parameters

buf	a pointer to a buffer of the given length
len	the length of the given buffer
seed	The seed to use.

Returns

the CRC16 checksum for the buffer

crc16_0x3D65_seed()

WS_DLL_PUBLIC uint16_t crc16_0x3D65_seed	(	const uint8_t *	buf,
		unsigned	len,
		uint16_t	seed
	)

Computes CRC16 checksum for the given data with the polynom 0x3D65 using precompiled CRC table

Parameters

buf	a pointer to a buffer of the given length
len	the length of the given buffer
seed	The seed to use.

Returns

the CRC16 checksum for the buffer

crc16_0x5935()

WS_DLL_PUBLIC uint16_t crc16_0x5935	(	const uint8_t *	buf,
		uint32_t	len,
		uint16_t	seed
	)

Calculates a CRC16 checksum for the given buffer with the polynom 0x5935 using a precompiled CRC table

Parameters

buf	a pointer to a buffer of the given length
len	the length of the given buffer
seed	The seed to use.

Returns

the CRC16 checksum for the buffer

crc16_0x755B()

WS_DLL_PUBLIC uint16_t crc16_0x755B	(	const uint8_t *	buf,
		uint32_t	len,
		uint16_t	seed
	)

Calculates a CRC16 checksum for the given buffer with the polynom 0x755B using a precompiled CRC table

Parameters

buf	a pointer to a buffer of the given length
len	the length of the given buffer
seed	The seed to use.

Returns

the CRC16 checksum for the buffer

crc16_0x9949_seed()

WS_DLL_PUBLIC uint16_t crc16_0x9949_seed	(	const uint8_t *	buf,
		unsigned	len,
		uint16_t	seed
	)

Computes CRC16 checksum for the given data with the polynom 0x9949 using precompiled CRC table

Parameters

buf	a pointer to a buffer of the given length
len	the length of the given buffer
seed	The seed to use.

Returns

the CRC16 checksum for the buffer

crc16_ccitt()

WS_DLL_PUBLIC uint16_t crc16_ccitt	(	const uint8_t *	buf,
		unsigned	len
	)

Compute CRC16 CCITT checksum of a buffer of data.

Parameters

buf	The buffer containing the data.
len	The number of bytes to include in the computation.

Returns

The CRC16 CCITT checksum.

crc16_ccitt_seed()

WS_DLL_PUBLIC uint16_t crc16_ccitt_seed	(	const uint8_t *	buf,
		unsigned	len,
		uint16_t	seed
	)

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.

Parameters

buf	The buffer containing the data.
len	The number of bytes to include in the computation.
seed	The seed to use.

Returns

The CRC16 CCITT checksum (using the given seed).

crc16_iso14443a()

WS_DLL_PUBLIC uint16_t crc16_iso14443a	(	const uint8_t *	buf,
		unsigned	len
	)

Compute the 16bit CRC_A value of a buffer as defined in ISO14443-3.

Parameters

buf	The buffer containing the data.
len	The number of bytes to include in the computation.

Returns

the CRC16 checksum for the buffer

crc16_usb()

WS_DLL_PUBLIC uint16_t crc16_usb	(	const uint8_t *	buf,
		unsigned	len
	)

Compute the 16bit CRC value of a buffer as defined in USB Specification.

Parameters

buf	The buffer containing the data.
len	The number of bytes to include in the computation.

Returns

the CRC16 checksum for the buffer

crc16_x25_ccitt_seed()

WS_DLL_PUBLIC uint16_t crc16_x25_ccitt_seed	(	const uint8_t *	buf,
		unsigned	len,
		uint16_t	seed
	)

Compute CRC16 X.25 CCITT checksum of a buffer of data.

Parameters

buf	The buffer containing the data.
len	The number of bytes to include in the computation.

Returns

The CRC16 X.25 CCITT checksum.