crc.c File Reference

CRC - 32 + 16 BIT ANSI X3.66 + CCITT CRC checksum files

• CRC 32, CRC16 and CCITT implementation.

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#include <stdio.h>
#include "str.h"
#include "ut.h"
#include "crc.h"

Include dependency graph for crc.c:

Go to the source code of this file.

Defines
#define	UPDC16(ch, crc)   (crc_16_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))
#define	UPDC32(ch, crc)   (crc_32_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))
#define	UPDCIT(ch, crc)   (ccitt_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))
Functions
void	crc32_uint (str *source_string, unsigned int *hash_ret)
	CRC32 value from source string.
unsigned short	crcitt_string (char *s, int len)
	Return CCITT value from string.
void	crcitt_string_array (char *dst, str src[], int size)
	CCITT value from array.
Variables
unsigned short int	ccitt_tab []
unsigned short int	crc_16_tab []
unsigned long int	crc_32_tab []

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Detailed Description

CRC - 32 + 16 BIT ANSI X3.66 + CCITT CRC checksum files

• CRC 32, CRC16 and CCITT implementation.

Definition in file crc.c.

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Define Documentation

#define UPDC16	(	ch,
		crc		)	(crc_16_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))

Definition at line 82 of file crc.c.

#define UPDC32	(	ch,
		crc		)	(crc_32_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))

Definition at line 80 of file crc.c.

#define UPDCIT	(	ch,
		crc		)	(ccitt_tab[((crc) ^ (ch)) & 0xff] ^ ((crc) >> 8))

Definition at line 81 of file crc.c.

Referenced by crcitt_string(), and crcitt_string_array().

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Function Documentation

void crc32_uint	(	str *	source_string,
		unsigned int *	hash_ret
	)

CRC32 value from source string.

Parameters:

	source_string	source string
	hash_ret	calulated CRC32

Definition at line 270 of file crc.c.

References crc_32_tab, hash, _str::len, len, and _str::s.

Referenced by hash_func().

unsigned short crcitt_string	(	char *	s,
		int	len
	)

Return CCITT value from string.

Parameters:

	s	intput char
	len	input length

Returns:

CCITT string

Definition at line 213 of file crc.c.

References UPDCIT.

void crcitt_string_array	(	char *	dst,
		str	src[],
		int	size
	)

CCITT value from array.

Parameters:

	dst	destination
	src	source array
	size	array size

Definition at line 233 of file crc.c.

References CRC16_LEN, int2reverse_hex(), _str::len, len, LM_CRIT, _str::s, and UPDCIT.

Referenced by calc_crc_suffix(), and generate_fromtag().

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Variable Documentation

unsigned short int ccitt_tab[]

CRC polynomial 0x8408

Definition at line 134 of file crc.c.

unsigned short int crc_16_tab[]

CRC polynomial 0xA001

Definition at line 171 of file crc.c.

unsigned long int crc_32_tab[]

CRC polynomial 0xedb88320

Definition at line 86 of file crc.c.

Referenced by crc32_uint().