crcio.cpp ファイル

#include "altstr.hpp"
#include <stdlib.h>
#include "myfile.h"
#include "chuf.h"
#include "lhazlzh.h"

マクロ定義
#define	LHAZ_BUF_SIZE   (8192 * 2)
#define	USHRT_BIT   16 /* (CHAR_BIT * sizeof(ushort)) */
#define	UPDATE_CRC(d, c)   (d) = (unsigned short)(crctable[((d) ^ (c)) & 0xFF] ^ ((d) >> CHAR_BIT))
#define	CRCPOLY   0xA001 /* CRC-16 */

関数
void	calccrc (ushort &crc, uchar *p, uint n)
uchar	lhaz_get (MYFILE &fp)
void	lhaz_encode_init (int, FILE *)
int	fread_crc (uchar *p, int n, MYFILE &fp)
void	init_putbits ()
ushort	calc_header_crc (uchar *p, uint n)
void	MakeCrcTable (void)

変数
unsigned short	crctable [UCHAR_MAX+1]
ushort	bitbuf
uchar *	lhaz_buf
ULONGLONG	lhaz_p = LHAZ_BUF_SIZE
ULONGLONG	lhaz_buf_size
ushort	lzh_crc

マクロ定義詳解

CRCPOLY

#define CRCPOLY   0xA001 /* CRC-16 */

LHAZ_BUF_SIZE

#define LHAZ_BUF_SIZE   (8192 * 2)

UPDATE_CRC

#define UPDATE_CRC	(		d,
			c
	)		(d) = (unsigned short)(crctable[((d) ^ (c)) & 0xFF] ^ ((d) >> CHAR_BIT))

USHRT_BIT

#define USHRT_BIT   16 /* (CHAR_BIT * sizeof(ushort)) */

関数詳解

calc_header_crc()

ushort calc_header_crc	(	uchar *	p,
		uint	n
	)

calccrc()

void calccrc	(	ushort &	crc,
		uchar *	p,
		uint	n
	)

fread_crc()

int fread_crc	(	uchar *	p,
		int	n,
		MYFILE &	fp
	)

init_putbits()

void init_putbits

(

)

lhaz_encode_init()

void lhaz_encode_init	(	int	,
		FILE *
	)

lhaz_get()

uchar lhaz_get

(

MYFILE &

fp

)

MakeCrcTable()

void MakeCrcTable

(

void

)

変数詳解

bitbuf

ushort bitbuf

crctable

unsigned short crctable[UCHAR_MAX+1]

lhaz_buf

uchar* lhaz_buf

lhaz_buf_size

ULONGLONG lhaz_buf_size

lhaz_p

ULONGLONG lhaz_p = LHAZ_BUF_SIZE

lzh_crc

ushort lzh_crc