crc32.cc File Reference

#include "zutil.h"
#include "crc32.h"

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Macros
#define	local   static
#define	TBLS   1
#define	DO1   crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)
#define	DO8   DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
#define	GF2_DIM   32 /* dimension of GF(2) vectors (length of CRC) */

Functions
local unsigned long gf2_matrix_times	OF ((unsigned long *mat, unsigned long vec))
local void gf2_matrix_square	OF ((unsigned long *square, unsigned long *mat))
local uLong crc32_combine_	OF ((uLong crc1, uLong crc2, z_off64_t len2))
const z_crc_t FAR *ZEXPORT	get_crc_table ()
unsigned long ZEXPORT	crc32 (unsigned long crc, const unsigned char FAR *buf, uInt len)
local unsigned long	gf2_matrix_times (unsigned long *mat, unsigned long vec)
local void	gf2_matrix_square (unsigned long *square, unsigned long *mat)
local uLong	crc32_combine_ (uLong crc1, uLong crc2, z_off64_t len2)
uLong ZEXPORT	crc32_combine (uLong crc1, uLong crc2, z_off_t len2)
uLong ZEXPORT	crc32_combine64 (uLong crc1, uLong crc2, z_off64_t len2)

Macro Definition Documentation

#define DO1   crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)

Definition at line 198 of file crc32.cc.

Referenced by crc32().

#define DO8   DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1

Definition at line 199 of file crc32.cc.

Referenced by crc32().

#define GF2_DIM   32 /* dimension of GF(2) vectors (length of CRC) */

Definition at line 313 of file crc32.cc.

Referenced by crc32_combine_(), and gf2_matrix_square().

#define local   static

Definition at line 33 of file crc32.cc.

#define TBLS   1

Definition at line 46 of file crc32.cc.

Function Documentation

unsigned long ZEXPORT crc32	(	unsigned long	crc,
		const unsigned char FAR *	buf,
		uInt	len
	)

Definition at line 202 of file crc32.cc.

References DO1, and DO8.

Referenced by deflate(), deflateResetKeep(), inflate(), and read_buf().

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uLong ZEXPORT crc32_combine	(	uLong	crc1,
		uLong	crc2,
		z_off_t	len2
	)

Definition at line 393 of file crc32.cc.

References crc32_combine_().

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uLong ZEXPORT crc32_combine64	(	uLong	crc1,
		uLong	crc2,
		z_off64_t	len2
	)

Definition at line 398 of file crc32.cc.

References crc32_combine_().

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local uLong crc32_combine_	(	uLong	crc1,
		uLong	crc2,
		z_off64_t	len2
	)

Definition at line 340 of file crc32.cc.

References GF2_DIM, gf2_matrix_square(), gf2_matrix_times(), and n.

Referenced by crc32_combine(), and crc32_combine64().

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const z_crc_t FAR* ZEXPORT get_crc_table

(

)

Definition at line 188 of file crc32.cc.

local void gf2_matrix_square	(	unsigned long *	square,
		unsigned long *	mat
	)

Definition at line 331 of file crc32.cc.

References GF2_DIM, gf2_matrix_times(), and n.

Referenced by crc32_combine_().

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local unsigned long gf2_matrix_times	(	unsigned long *	mat,
		unsigned long	vec
	)

Definition at line 316 of file crc32.cc.

Referenced by crc32_combine_(), and gf2_matrix_square().

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local unsigned long gf2_matrix_times OF

(

(unsigned long *mat, unsigned long vec)

)

local void gf2_matrix_square OF

(

(unsigned long *square, unsigned long *mat)

)

local uLong crc32_combine_ OF

(

(uLong crc1, uLong crc2, z_off64_t len2)

)