deflate.cc File Reference

#include "deflate.h"

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Classes
struct	config_s
struct	static_tree_desc_s

Macros
#define	NIL   0
#define	TOO_FAR   4096
#define	EQUAL   0
#define	RANK(f)   (((f) << 1) - ((f) > 4 ? 9 : 0))
#define	UPDATE_HASH(s, h, c)   (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
#define	INSERT_STRING(s, str, match_head)
#define	CLEAR_HASH(s)
#define	check_match(s, start, match, length)
#define	FLUSH_BLOCK_ONLY(s, last)
#define	FLUSH_BLOCK(s, last)

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 void fill_window	OF ((deflate_state *s))
local block_state deflate_stored	OF ((deflate_state *s, int flush))
local void putShortMSB	OF ((deflate_state *s, uInt b))
local void flush_pending	OF ((z_streamp strm))
local int read_buf	OF ((z_streamp strm, Bytef *buf, unsigned size))
local uInt longest_match	OF ((deflate_state *s, IPos cur_match))
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)
int ZEXPORT	deflateSetDictionary (z_streamp strm, const 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 int	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
local const config	configuration_table [10]

Macro Definition Documentation

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

Definition at line 1323 of file deflate.cc.

Referenced by deflate_fast(), deflate_rle(), and deflate_slow().

#define CLEAR_HASH

(

s

)

Value:

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

Definition at line 196 of file deflate.cc.

Referenced by deflate(), deflateSetDictionary(), and lm_init().

#define EQUAL   0

Definition at line 151 of file deflate.cc.

#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 1495 of file deflate.cc.

Referenced by deflate_fast(), deflate_huff(), deflate_rle(), deflate_slow(), and deflate_stored().

#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 1483 of file deflate.cc.

Referenced by deflate_slow().

#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 186 of file deflate.cc.

Referenced by deflate_fast(), and deflate_slow().

#define NIL   0

Definition at line 104 of file deflate.cc.

Referenced by deflate_fast(), deflate_slow(), fill_window(), and longest_match().

#define RANK

(

f

)

(((f) << 1) - ((f) > 4 ? 9 : 0))

Definition at line 159 of file deflate.cc.

Referenced by deflate().

#define TOO_FAR   4096

Definition at line 108 of file deflate.cc.

Referenced by deflate_slow().

#define UPDATE_HASH	(		s,
			h,
			c
	)		(h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)

Definition at line 167 of file deflate.cc.

Referenced by deflate_fast(), deflateSetDictionary(), and fill_window().

Typedef Documentation

typedef struct config_s config

local void bi_flush OF

(

(deflate_state *s, int flush)

)

Definition at line 73 of file deflate.cc.

Enumeration Type Documentation

enum block_state

Enumerator
need_more
block_done
finish_started
finish_done

Definition at line 66 of file deflate.cc.

Function Documentation

int ZEXPORT deflate	(	z_streamp	strm,
		int	flush
	)

Definition at line 627 of file deflate.cc.

References _tr_align(), _tr_stored_block(), adler32(), block_done, CLEAR_HASH, crc32(), deflate_huff(), deflate_rle(), finish_done, finish_started, flush_pending(), L, need_more, putShortMSB(), RANK, and s.

Referenced by compress2(), deflateParams(), and gz_comp().

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local block_state deflate_fast	(	deflate_state *	s,
		int	flush
	)

Definition at line 1571 of file deflate.cc.

References block_done, check_match, fill_window(), finish_done, FLUSH_BLOCK, INSERT_STRING, longest_match(), need_more, NIL, times, and UPDATE_HASH.

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local block_state deflate_huff	(	deflate_state *	s,
		int	flush
	)

Definition at line 1871 of file deflate.cc.

References block_done, fill_window(), finish_done, FLUSH_BLOCK, and need_more.

Referenced by deflate().

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local block_state deflate_rle	(	deflate_state *	s,
		int	flush
	)

Definition at line 1800 of file deflate.cc.

References block_done, check_match, fill_window(), finish_done, FLUSH_BLOCK, and need_more.

Referenced by deflate().

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local block_state deflate_slow	(	deflate_state *	s,
		int	flush
	)

Definition at line 1671 of file deflate.cc.

References block_done, check_match, fill_window(), finish_done, FLUSH_BLOCK, FLUSH_BLOCK_ONLY, INSERT_STRING, longest_match(), need_more, NIL, and TOO_FAR.

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local block_state deflate_stored	(	deflate_state *	s,
		int	flush
	)

Definition at line 1509 of file deflate.cc.

References block_done, fill_window(), finish_done, FLUSH_BLOCK, L, and need_more.

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uLong ZEXPORT deflateBound	(	z_streamp	strm,
		uLong	sourceLen
	)

Definition at line 533 of file deflate.cc.

References s.

int ZEXPORT deflateCopy	(	z_streamp	dest,
		z_streamp	source
	)

Definition at line 973 of file deflate.cc.

References deflateEnd(), and zmemcpy().

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int ZEXPORT deflateEnd

(

z_streamp

strm

)

Definition at line 939 of file deflate.cc.

Referenced by compress2(), deflateCopy(), deflateInit2_(), and gzclose_w().

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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 209 of file deflate.cc.

References deflateEnd(), deflateReset(), L, s, zcalloc(), and zcfree().

Referenced by deflateInit_().

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

Definition at line 201 of file deflate.cc.

References deflateInit2_().

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

Definition at line 465 of file deflate.cc.

References deflate(), and s.

Referenced by gzsetparams().

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

Definition at line 431 of file deflate.cc.

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

Definition at line 442 of file deflate.cc.

References _tr_flush_bits(), and s.

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int ZEXPORT deflateReset

(

z_streamp

strm

)

Definition at line 411 of file deflate.cc.

References deflateResetKeep(), and lm_init().

Referenced by deflateInit2_(), and gz_comp().

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int ZEXPORT deflateResetKeep

(

z_streamp

strm

)

Definition at line 377 of file deflate.cc.

References _tr_init(), adler32(), crc32(), L, and s.

Referenced by deflateReset().

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

Definition at line 311 of file deflate.cc.

References adler32(), CLEAR_HASH, fill_window(), L, n, s, and UPDATE_HASH.

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int ZEXPORT deflateSetHeader	(	z_streamp	strm,
		gz_headerp	head
	)

Definition at line 422 of file deflate.cc.

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

Definition at line 503 of file deflate.cc.

References s.

local void fill_window

(

deflate_state *

s

)

Definition at line 1336 of file deflate.cc.

References m, n, NIL, read_buf(), times, UPDATE_HASH, zmemcpy(), and zmemzero().

Referenced by deflate_fast(), deflate_huff(), deflate_rle(), deflate_slow(), deflate_stored(), and deflateSetDictionary().

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local void flush_pending

(

z_streamp

strm

)

Definition at line 605 of file deflate.cc.

References _tr_flush_bits(), and zmemcpy().

Referenced by deflate().

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local void lm_init

(

deflate_state *

s

)

Definition at line 1060 of file deflate.cc.

References CLEAR_HASH, and L.

Referenced by deflateReset().

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local uInt longest_match	(	deflate_state *	s,
		IPos	cur_match
	)

Definition at line 1101 of file deflate.cc.

References NIL.

Referenced by deflate_fast(), and deflate_slow().

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local void fill_window OF

(

(deflate_state *s)

)

local block_state deflate_stored OF

(

(deflate_state *s, int flush)

)

local void putShortMSB OF

(

(deflate_state *s, uInt b)

)

local void flush_pending OF

(

(z_streamp strm)

)

local int read_buf OF

(

(z_streamp strm, Bytef *buf, unsigned size)

)

local uInt longest_match OF

(

(deflate_state *s, IPos cur_match)

)

local void putShortMSB	(	deflate_state *	s,
		uInt	b
	)

Definition at line 593 of file deflate.cc.

Referenced by deflate().

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

Definition at line 1033 of file deflate.cc.

References adler32(), crc32(), and zmemcpy().

Referenced by fill_window().

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Variable Documentation

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 131 of file deflate.cc.