FBLib_compression.h File Reference

#include <limits.h>
#include "type.h"
#include "libFireBird.h"

Go to the source code of this file.

Data Structures
struct	HASH
struct	MATCHDATA
struct	ARDATA

Macros
#define	LOAD_WORD(x)   (((x)[0] << 8) | (x)[1])
#define	LOAD_WORDLE(x)   (((x)[1] << 8) | (x)[0])
#define	STORE_WORD(x, y)   (x)[0] = (y) >> 8;(x)[1] = (y) & 0xff
#define	STORE_WORDLE(x, y)   (x)[1] = (y) >> 8;(x)[0] = (y) & 0xff
#define	LZHUFF5_METHOD_NUM   5
#define	LZHUFF6_METHOD_NUM   6
#define	LZHUFF7_METHOD_NUM   7
#define	LZHUFF4_DICBIT   12 /* 2^12 = 4KB sliding dictionary */
#define	LZHUFF5_DICBIT   13 /* 2^13 = 8KB sliding dictionary */
#define	LZHUFF6_DICBIT   15 /* 2^15 = 32KB sliding dictionary */
#define	LZHUFF7_DICBIT   16 /* 2^16 = 64KB sliding dictionary */
#define	NIL   0
#define	INIT_HASH(pos)
#define	NEXT_HASH(hash, pos)
#define	peekbits(n)   (ArData->bitbuf >> (sizeof(ArData->bitbuf)*8 - (n)))
#define	NC   (UCHAR_MAX + MAXMATCH + 2 - THRESHOLD)
#define	MAXMATCH   256 /* formerly F (not more than UCHAR_MAX + 1) */
#define	THRESHOLD   3 /* choose optimal value */
#define	MAX_DICBIT   LZHUFF7_DICBIT /* lh7 use 16bits */
#define	MAX_DICSIZ   (1L << MAX_DICBIT)
#define	USHRT_BIT   16 /* (CHAR_BIT * sizeof(ushort)) */
#define	NP   (MAX_DICBIT + 1)
#define	NT   (USHRT_BIT + 3)
#define	NPT   0x80 /* #if NT > NP #define NPT NT #else #define NPT NP #endif */
#define	TBIT   5 /* smallest integer such that (1 << TBIT) > * NT */
#define	CBIT   9 /* smallest integer such that (1 << CBIT) > * NC */
#define	HSHSIZ   (((dword)1) <<15)
#define	TXTSIZ   (MAX_DICSIZ * 2L + MAXMATCH)
#define	LIMIT   0x100 /* limit of hash chain */

Macro Definition Documentation

CBIT

#define CBIT   9 /* smallest integer such that (1 << CBIT) > * NC */

Definition at line 62 of file FBLib_compression.h.

HSHSIZ

#define HSHSIZ   (((dword)1) <<15)

Definition at line 63 of file FBLib_compression.h.

INIT_HASH

#define INIT_HASH

(

pos

)

Value:

        ((( (ArData->text[(pos)] << 5) \
           ^ ArData->text[(pos) + 1]  ) << 5) \
           ^ ArData->text[(pos) + 2]         ) & (unsigned)(HSHSIZ - 1);

Definition at line 42 of file FBLib_compression.h.

LIMIT

#define LIMIT   0x100 /* limit of hash chain */

Definition at line 65 of file FBLib_compression.h.

LOAD_WORD

#define LOAD_WORD

(

x

)

(((x)[0] << 8) | (x)[1])

Definition at line 25 of file FBLib_compression.h.

LOAD_WORDLE

#define LOAD_WORDLE

(

x

)

(((x)[1] << 8) | (x)[0])

Definition at line 26 of file FBLib_compression.h.

LZHUFF4_DICBIT

#define LZHUFF4_DICBIT   12 /* 2^12 = 4KB sliding dictionary */

Definition at line 34 of file FBLib_compression.h.

LZHUFF5_DICBIT

#define LZHUFF5_DICBIT   13 /* 2^13 = 8KB sliding dictionary */

Definition at line 35 of file FBLib_compression.h.

LZHUFF5_METHOD_NUM

#define LZHUFF5_METHOD_NUM   5

Definition at line 30 of file FBLib_compression.h.

LZHUFF6_DICBIT

#define LZHUFF6_DICBIT   15 /* 2^15 = 32KB sliding dictionary */

Definition at line 36 of file FBLib_compression.h.

LZHUFF6_METHOD_NUM

#define LZHUFF6_METHOD_NUM   6

Definition at line 31 of file FBLib_compression.h.

LZHUFF7_DICBIT

#define LZHUFF7_DICBIT   16 /* 2^16 = 64KB sliding dictionary */

Definition at line 37 of file FBLib_compression.h.

LZHUFF7_METHOD_NUM

#define LZHUFF7_METHOD_NUM   7

Definition at line 32 of file FBLib_compression.h.

MAX_DICBIT

#define MAX_DICBIT   LZHUFF7_DICBIT /* lh7 use 16bits */

Definition at line 55 of file FBLib_compression.h.

MAX_DICSIZ

#define MAX_DICSIZ   (1L << MAX_DICBIT)

Definition at line 56 of file FBLib_compression.h.

MAXMATCH

#define MAXMATCH   256 /* formerly F (not more than UCHAR_MAX + 1) */

Definition at line 53 of file FBLib_compression.h.

NC

#define NC   (UCHAR_MAX + MAXMATCH + 2 - THRESHOLD)

Definition at line 52 of file FBLib_compression.h.

NEXT_HASH

#define NEXT_HASH	(		hash,
			pos
	)

Value:

        (((hash) << 5) \
           ^ ArData->text[(pos) + 2]         ) & (unsigned)(HSHSIZ - 1);

Definition at line 46 of file FBLib_compression.h.

NIL

#define NIL   0

Definition at line 39 of file FBLib_compression.h.

NP

#define NP   (MAX_DICBIT + 1)

Definition at line 58 of file FBLib_compression.h.

NPT

#define NPT   0x80 /* #if NT > NP #define NPT NT #else #define NPT NP #endif */

Definition at line 60 of file FBLib_compression.h.

NT

#define NT   (USHRT_BIT + 3)

Definition at line 59 of file FBLib_compression.h.

peekbits

#define peekbits

(

n

)

(ArData->bitbuf >> (sizeof(ArData->bitbuf)*8 - (n)))

Definition at line 51 of file FBLib_compression.h.

STORE_WORD

#define STORE_WORD	(		x,
			y
	)		(x)[0] = (y) >> 8;(x)[1] = (y) & 0xff

Definition at line 27 of file FBLib_compression.h.

STORE_WORDLE

#define STORE_WORDLE	(		x,
			y
	)		(x)[1] = (y) >> 8;(x)[0] = (y) & 0xff

Definition at line 28 of file FBLib_compression.h.

TBIT

#define TBIT   5 /* smallest integer such that (1 << TBIT) > * NT */

Definition at line 61 of file FBLib_compression.h.

THRESHOLD

#define THRESHOLD   3 /* choose optimal value */

Definition at line 54 of file FBLib_compression.h.

TXTSIZ

#define TXTSIZ   (MAX_DICSIZ * 2L + MAXMATCH)

Definition at line 64 of file FBLib_compression.h.

USHRT_BIT

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

Definition at line 57 of file FBLib_compression.h.