deflate.c File Reference

#include "deflate.h"

Go to the source code of this file.

Data Structures
struct	config_s

Macros
#define	NIL   0
#define	TOO_FAR   4096
#define	RANK(f)
#define	UPDATE_HASH(s, h, c)
#define	INSERT_STRING(s, str, match_head)
#define	CLEAR_HASH(s)
#define	HCRC_UPDATE(beg)
#define	check_match(s, start, match, length)
#define	FLUSH_BLOCK_ONLY(s, last)
#define	FLUSH_BLOCK(s, last)
#define	MAX_STORED   65535
#define	MIN(a, b)

Typedefs
typedef block_state compress_func	OF((deflate_state *s, int flush))
typedef struct config_s	config

Enumerations
enum	block_state { need_more , block_done , finish_started , finish_done }

Functions
local int deflateStateCheck	OF ((z_streamp strm))
local void slide_hash	OF ((deflate_state *s))
local void putShortMSB	OF ((deflate_state *s, uInt b))
local unsigned read_buf	OF ((z_streamp strm, Bytef *buf, unsigned size))
local uInt longest_match	OF ((deflate_state *s, IPos cur_match))
local void	slide_hash (deflate_state *s)
int ZEXPORT	deflateInit_ (z_streamp strm, int level, const char *version, int stream_size)
int ZEXPORT	deflateInit2_ (z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy, const char *version, int stream_size)
local int	deflateStateCheck (z_streamp strm)
int ZEXPORT	deflateSetDictionary (z_streamp strm, const Bytef *dictionary, uInt dictLength)
int ZEXPORT	deflateGetDictionary (z_streamp strm, Bytef *dictionary, uInt *dictLength)
int ZEXPORT	deflateResetKeep (z_streamp strm)
int ZEXPORT	deflateReset (z_streamp strm)
int ZEXPORT	deflateSetHeader (z_streamp strm, gz_headerp head)
int ZEXPORT	deflatePending (z_streamp strm, unsigned *pending, int *bits)
int ZEXPORT	deflatePrime (z_streamp strm, int bits, int value)
int ZEXPORT	deflateParams (z_streamp strm, int level, int strategy)
int ZEXPORT	deflateTune (z_streamp strm, int good_length, int max_lazy, int nice_length, int max_chain)
uLong ZEXPORT	deflateBound (z_streamp strm, uLong sourceLen)
local void	putShortMSB (deflate_state *s, uInt b)
local void	flush_pending (z_streamp strm)
int ZEXPORT	deflate (z_streamp strm, int flush)
int ZEXPORT	deflateEnd (z_streamp strm)
int ZEXPORT	deflateCopy (z_streamp dest, z_streamp source)
local unsigned	read_buf (z_streamp strm, Bytef *buf, unsigned size)
local void	lm_init (deflate_state *s)
local uInt	longest_match (deflate_state *s, IPos cur_match)
local void	fill_window (deflate_state *s)
local block_state	deflate_stored (deflate_state *s, int flush)
local block_state	deflate_fast (deflate_state *s, int flush)
local block_state	deflate_slow (deflate_state *s, int flush)
local block_state	deflate_rle (deflate_state *s, int flush)
local block_state	deflate_huff (deflate_state *s, int flush)

Variables
const char	deflate_copyright []
local const config	configuration_table [10]

Macro Definition Documentation

check_match

#define check_match	(		s,
			start,
			match,
			length )

Definition at line 1514 of file deflate.c.

CLEAR_HASH

#define CLEAR_HASH

(

s

)

Value:

    do { \
        s->head[s->hash_size - 1] = NIL; \
        zmemzero((Bytef *)s->head, \
                 (unsigned)(s->hash_size - 1)*sizeof(*s->head)); \
    } while (0)

Definition at line 186 of file deflate.c.

FLUSH_BLOCK

#define FLUSH_BLOCK	(		s,
			last )

Value:

   { \
   FLUSH_BLOCK_ONLY(s, last); \
   if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
}

Definition at line 1664 of file deflate.c.

FLUSH_BLOCK_ONLY

#define FLUSH_BLOCK_ONLY	(		s,
			last )

Value:

   { \
   _tr_flush_block(s, (s->block_start >= 0L ? \
                   (charf *)&s->window[(unsigned)s->block_start] : \
                   (charf *)Z_NULL), \
                (ulg)((long)s->strstart - s->block_start), \
                (last)); \
   s->block_start = s->strstart; \
   flush_pending(s->strm); \
   Tracev((stderr,"[FLUSH]")); \
}

Definition at line 1652 of file deflate.c.

HCRC_UPDATE

#define HCRC_UPDATE

(

beg

)

Value:

    do { \
        if (s->gzhead->hcrc && s->pending > (beg)) \
            strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
                                s->pending - (beg)); \
    } while (0)

Definition at line 807 of file deflate.c.

INSERT_STRING

#define INSERT_STRING	(		s,
			str,
			match_head )

Value:

   (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
    match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
    s->head[s->ins_h] = (Pos)(str))

Definition at line 176 of file deflate.c.

MAX_STORED

#define MAX_STORED   65535

Definition at line 1670 of file deflate.c.

MIN

#define MIN	(		a,
			b )

Value:

((a) > (b) ? (b) : (a))

Definition at line 1673 of file deflate.c.

NIL

#define NIL   0

Definition at line 101 of file deflate.c.

RANK

#define RANK

(

f

)

Value:

(((f) * 2) - ((f) > 4 ? 9 : 0))

Definition at line 149 of file deflate.c.

TOO_FAR

#define TOO_FAR   4096

Definition at line 105 of file deflate.c.

UPDATE_HASH

#define UPDATE_HASH	(		s,
			h,
			c )

Value:

(h = (((h) << s->hash_shift) ^ (c)) & s->hash_mask)

Definition at line 157 of file deflate.c.

Typedef Documentation

config

typedef struct config_s config

OF

ZEXTERN uLong ZEXPORT crc32_combine64 OF

Definition at line 73 of file deflate.c.

Enumeration Type Documentation

block_state

enum block_state

Enumerator
need_more
block_done
finish_started
finish_done

Definition at line 66 of file deflate.c.

Function Documentation

deflate()

int ZEXPORT deflate	(	z_streamp	strm,
		int	flush )

Definition at line 815 of file deflate.c.

deflate_fast()

local block_state deflate_fast	(	deflate_state *	s,
		int	flush )

Definition at line 1877 of file deflate.c.

deflate_huff()

local block_state deflate_huff	(	deflate_state *	s,
		int	flush )

Definition at line 2184 of file deflate.c.

deflate_rle()

local block_state deflate_rle	(	deflate_state *	s,
		int	flush )

Definition at line 2110 of file deflate.c.

deflate_slow()

local block_state deflate_slow	(	deflate_state *	s,
		int	flush )

Definition at line 1979 of file deflate.c.

deflate_stored()

local block_state deflate_stored	(	deflate_state *	s,
		int	flush )

Definition at line 1690 of file deflate.c.

deflateBound()

uLong ZEXPORT deflateBound	(	z_streamp	strm,
		uLong	sourceLen )

Definition at line 696 of file deflate.c.

deflateCopy()

int ZEXPORT deflateCopy	(	z_streamp	dest,
		z_streamp	source )

Definition at line 1156 of file deflate.c.

deflateEnd()

int ZEXPORT deflateEnd

(

z_streamp

strm

)

Definition at line 1130 of file deflate.c.

deflateGetDictionary()

int ZEXPORT deflateGetDictionary	(	z_streamp	strm,
		Bytef *	dictionary,
		uInt *	dictLength )

Definition at line 481 of file deflate.c.

deflateInit2_()

int ZEXPORT deflateInit2_	(	z_streamp	strm,
		int	level,
		int	method,
		int	windowBits,
		int	memLevel,
		int	strategy,
		const char *	version,
		int	stream_size )

Definition at line 237 of file deflate.c.

deflateInit_()

int ZEXPORT deflateInit_	(	z_streamp	strm,
		int	level,
		const char *	version,
		int	stream_size )

Definition at line 225 of file deflate.c.

deflateParams()

int ZEXPORT deflateParams	(	z_streamp	strm,
		int	level,
		int	strategy )

Definition at line 605 of file deflate.c.

deflatePending()

int ZEXPORT deflatePending	(	z_streamp	strm,
		unsigned *	pending,
		int *	bits )

Definition at line 564 of file deflate.c.

deflatePrime()

int ZEXPORT deflatePrime	(	z_streamp	strm,
		int	bits,
		int	value )

Definition at line 578 of file deflate.c.

deflateReset()

int ZEXPORT deflateReset

(

z_streamp

strm

)

Definition at line 541 of file deflate.c.

deflateResetKeep()

int ZEXPORT deflateResetKeep

(

z_streamp

strm

)

Definition at line 503 of file deflate.c.

deflateSetDictionary()

int ZEXPORT deflateSetDictionary	(	z_streamp	strm,
		const Bytef *	dictionary,
		uInt	dictLength )

Definition at line 412 of file deflate.c.

deflateSetHeader()

int ZEXPORT deflateSetHeader	(	z_streamp	strm,
		gz_headerp	head )

Definition at line 553 of file deflate.c.

deflateStateCheck()

local int deflateStateCheck

(

z_streamp

strm

)

Definition at line 389 of file deflate.c.

deflateTune()

int ZEXPORT deflateTune	(	z_streamp	strm,
		int	good_length,
		int	max_lazy,
		int	nice_length,
		int	max_chain )

Definition at line 654 of file deflate.c.

fill_window()

local void fill_window

(

deflate_state *

s

)

Definition at line 1527 of file deflate.c.

flush_pending()

local void flush_pending

(

z_streamp

strm

)

Definition at line 782 of file deflate.c.

lm_init()

local void lm_init

(

deflate_state *

s

)

Definition at line 1245 of file deflate.c.

longest_match()

local uInt longest_match	(	deflate_state *	s,
		IPos	cur_match )

Definition at line 1278 of file deflate.c.

OF() [1/5]

local void slide_hash OF

(

(deflate_state *s)

)

OF() [2/5]

local uInt longest_match OF

(

(deflate_state *s, IPos cur_match)

)

OF() [3/5]

local void putShortMSB OF

(

(deflate_state *s, uInt b)

)

OF() [4/5]

local int deflateStateCheck OF

(

(z_streamp strm)

)

OF() [5/5]

local unsigned read_buf OF

(

(z_streamp strm, Bytef *buf, unsigned size)

)

putShortMSB()

local void putShortMSB	(	deflate_state *	s,
		uInt	b )

Definition at line 768 of file deflate.c.

read_buf()

local unsigned read_buf	(	z_streamp	strm,
		Bytef *	buf,
		unsigned	size )

Definition at line 1215 of file deflate.c.

slide_hash()

local void slide_hash

(

deflate_state *

s

)

Definition at line 198 of file deflate.c.

Variable Documentation

configuration_table

local const config configuration_table[10]

Initial value:

= {
 
 {0,    0,  0,    0, deflate_stored},  
 {4,    4,  8,    4, deflate_fast}, 
 {4,    5, 16,    8, deflate_fast},
 {4,    6, 32,   32, deflate_fast},
 
 {4,    4, 16,   16, deflate_slow},  
 {8,   16, 32,   32, deflate_slow},
 {8,   16, 128, 128, deflate_slow},
 {8,   32, 128, 256, deflate_slow},
 {32, 128, 258, 1024, deflate_slow},
 {32, 258, 258, 4096, deflate_slow}}

Definition at line 128 of file deflate.c.

deflate_copyright

const char deflate_copyright[]

Initial value:

=
   " deflate 1.2.13 Copyright 1995-2022 Jean-loup Gailly and Mark Adler "

Definition at line 54 of file deflate.c.