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cosmopolitan/third_party/zip/deflate.c
Justine Tunney 87396f43bc Flatten InfoZIP directory and fix build issues
2022-04-20 22:40:33 -07:00

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/* clang-format off */
/*
deflate.c - Zip 3
Copyright (c) 1990-2007 Info-ZIP. All rights reserved.
See the accompanying file LICENSE, version 2005-Feb-10 or later
(the contents of which are also included in zip.h) for terms of use.
If, for some reason, all these files are missing, the Info-ZIP license
also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/*
* deflate.c by Jean-loup Gailly.
*
* PURPOSE
*
* Identify new text as repetitions of old text within a fixed-
* length sliding window trailing behind the new text.
*
* DISCUSSION
*
* The "deflation" process depends on being able to identify portions
* of the input text which are identical to earlier input (within a
* sliding window trailing behind the input currently being processed).
*
* The most straightforward technique turns out to be the fastest for
* most input files: try all possible matches and select the longest.
* The key feature of this algorithm is that insertions into the string
* dictionary are very simple and thus fast, and deletions are avoided
* completely. Insertions are performed at each input character, whereas
* string matches are performed only when the previous match ends. So it
* is preferable to spend more time in matches to allow very fast string
* insertions and avoid deletions. The matching algorithm for small
* strings is inspired from that of Rabin & Karp. A brute force approach
* is used to find longer strings when a small match has been found.
* A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
* (by Leonid Broukhis).
* A previous version of this file used a more sophisticated algorithm
* (by Fiala and Greene) which is guaranteed to run in linear amortized
* time, but has a larger average cost, uses more memory and is patented.
* However the F&G algorithm may be faster for some highly redundant
* files if the parameter max_chain_length (described below) is too large.
*
* ACKNOWLEDGEMENTS
*
* The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
* I found it in 'freeze' written by Leonid Broukhis.
* Thanks to many info-zippers for bug reports and testing.
*
* REFERENCES
*
* APPNOTE.TXT documentation file in PKZIP 1.93a distribution.
*
* A description of the Rabin and Karp algorithm is given in the book
* "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
*
* Fiala,E.R., and Greene,D.H.
* Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
*
* INTERFACE
*
* void lm_init (int pack_level, ush *flags)
* Initialize the "longest match" routines for a new file
*
* ulg deflate (void)
* Processes a new input file and return its compressed length. Sets
* the compressed length, crc, deflate flags and internal file
* attributes.
*/
#define __DEFLATE_C
#include "third_party/zip/zip.h"
#ifndef USE_ZLIB
/* ===========================================================================
* Configuration parameters
*/
/* Compile with MEDIUM_MEM to reduce the memory requirements or
* with SMALL_MEM to use as little memory as possible. Use BIG_MEM if the
* entire input file can be held in memory (not possible on 16 bit systems).
* Warning: defining these symbols affects HASH_BITS (see below) and thus
* affects the compression ratio. The compressed output
* is still correct, and might even be smaller in some cases.
*/
#ifdef SMALL_MEM
# define HASH_BITS 13 /* Number of bits used to hash strings */
#endif
#ifdef MEDIUM_MEM
# define HASH_BITS 14
#endif
#ifndef HASH_BITS
# define HASH_BITS 15
/* For portability to 16 bit machines, do not use values above 15. */
#endif
#define HASH_SIZE (unsigned)(1<<HASH_BITS)
#define HASH_MASK (HASH_SIZE-1)
#define WMASK (WSIZE-1)
/* HASH_SIZE and WSIZE must be powers of two */
#define NIL 0
/* Tail of hash chains */
#define FAST 4
#define SLOW 2
/* speed options for the general purpose bit flag */
#ifndef TOO_FAR
# define TOO_FAR 4096
#endif
/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
#if (defined(ASMV) && !defined(MSDOS16) && defined(DYN_ALLOC))
error: DYN_ALLOC not yet supported in match.S or match32.asm
#endif
#ifdef MEMORY16
# define MAXSEG_64K
#endif
/* ===========================================================================
* Local data used by the "longest match" routines.
*/
#if defined(MMAP) || defined(BIG_MEM)
typedef unsigned Pos; /* must be at least 32 bits */
#else
typedef ush Pos;
#endif
typedef unsigned IPos;
/* A Pos is an index in the character window. We use short instead of int to
* save space in the various tables. IPos is used only for parameter passing.
*/
#ifndef DYN_ALLOC
uch window[2L*WSIZE];
/* Sliding window. Input bytes are read into the second half of the window,
* and move to the first half later to keep a dictionary of at least WSIZE
* bytes. With this organization, matches are limited to a distance of
* WSIZE-MAX_MATCH bytes, but this ensures that IO is always
* performed with a length multiple of the block size. Also, it limits
* the window size to 64K, which is quite useful on MSDOS.
* To do: limit the window size to WSIZE+CBSZ if SMALL_MEM (the code would
* be less efficient since the data would have to be copied WSIZE/CBSZ times)
*/
Pos prev[WSIZE];
/* Link to older string with same hash index. To limit the size of this
* array to 64K, this link is maintained only for the last 32K strings.
* An index in this array is thus a window index modulo 32K.
*/
Pos head[HASH_SIZE];
/* Heads of the hash chains or NIL. If your compiler thinks that
* HASH_SIZE is a dynamic value, recompile with -DDYN_ALLOC.
*/
#else
uch far * near window = NULL;
Pos far * near prev = NULL;
Pos far * near head;
#endif
ulg window_size;
/* window size, 2*WSIZE except for MMAP or BIG_MEM, where it is the
* input file length plus MIN_LOOKAHEAD.
*/
long block_start;
/* window position at the beginning of the current output block. Gets
* negative when the window is moved backwards.
*/
local int sliding;
/* Set to false when the input file is already in memory */
local unsigned ins_h; /* hash index of string to be inserted */
#define H_SHIFT ((HASH_BITS+MIN_MATCH-1)/MIN_MATCH)
/* Number of bits by which ins_h and del_h must be shifted at each
* input step. It must be such that after MIN_MATCH steps, the oldest
* byte no longer takes part in the hash key, that is:
* H_SHIFT * MIN_MATCH >= HASH_BITS
*/
unsigned int near prev_length;
/* Length of the best match at previous step. Matches not greater than this
* are discarded. This is used in the lazy match evaluation.
*/
unsigned near strstart; /* start of string to insert */
unsigned near match_start; /* start of matching string */
local int eofile; /* flag set at end of input file */
local unsigned lookahead; /* number of valid bytes ahead in window */
unsigned near max_chain_length;
/* To speed up deflation, hash chains are never searched beyond this length.
* A higher limit improves compression ratio but degrades the speed.
*/
local unsigned int max_lazy_match;
/* Attempt to find a better match only when the current match is strictly
* smaller than this value. This mechanism is used only for compression
* levels >= 4.
*/
#define max_insert_length max_lazy_match
/* Insert new strings in the hash table only if the match length
* is not greater than this length. This saves time but degrades compression.
* max_insert_length is used only for compression levels <= 3.
*/
unsigned near good_match;
/* Use a faster search when the previous match is longer than this */
#ifdef FULL_SEARCH
# define nice_match MAX_MATCH
#else
int near nice_match; /* Stop searching when current match exceeds this */
#endif
/* Values for max_lazy_match, good_match, nice_match and max_chain_length,
* depending on the desired pack level (0..9). The values given below have
* been tuned to exclude worst case performance for pathological files.
* Better values may be found for specific files.
*/
typedef struct config {
ush good_length; /* reduce lazy search above this match length */
ush max_lazy; /* do not perform lazy search above this match length */
ush nice_length; /* quit search above this match length */
ush max_chain;
} config;
local config configuration_table[10] = {
/* good lazy nice chain */
/* 0 */ {0, 0, 0, 0}, /* store only */
/* 1 */ {4, 4, 8, 4}, /* maximum speed, no lazy matches */
/* 2 */ {4, 5, 16, 8},
/* 3 */ {4, 6, 32, 32},
/* 4 */ {4, 4, 16, 16}, /* lazy matches */
/* 5 */ {8, 16, 32, 32},
/* 6 */ {8, 16, 128, 128},
/* 7 */ {8, 32, 128, 256},
/* 8 */ {32, 128, 258, 1024},
/* 9 */ {32, 258, 258, 4096}}; /* maximum compression */
/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
* For deflate_fast() (levels <= 3) good is ignored and lazy has a different
* meaning.
*/
#define EQUAL 0
/* result of memcmp for equal strings */
/* ===========================================================================
* Prototypes for local functions.
*/
local void fill_window OF((void));
local uzoff_t deflate_fast OF((void)); /* now use uzoff_t 7/24/04 EG */
int longest_match OF((IPos cur_match));
#if defined(ASMV) && !defined(RISCOS)
void match_init OF((void)); /* asm code initialization */
#endif
#ifdef DEBUG
local void check_match OF((IPos start, IPos match, int length));
#endif
/* ===========================================================================
* Update a hash value with the given input byte
* IN assertion: all calls to to UPDATE_HASH are made with consecutive
* input characters, so that a running hash key can be computed from the
* previous key instead of complete recalculation each time.
*/
#define UPDATE_HASH(h,c) (h = (((h)<<H_SHIFT) ^ (c)) & HASH_MASK)
/* ===========================================================================
* Insert string s in the dictionary and set match_head to the previous head
* of the hash chain (the most recent string with same hash key). Return
* the previous length of the hash chain.
* IN assertion: all calls to to INSERT_STRING are made with consecutive
* input characters and the first MIN_MATCH bytes of s are valid
* (except for the last MIN_MATCH-1 bytes of the input file).
*/
#define INSERT_STRING(s, match_head) \
(UPDATE_HASH(ins_h, window[(s) + (MIN_MATCH-1)]), \
prev[(s) & WMASK] = match_head = head[ins_h], \
head[ins_h] = (s))
/* ===========================================================================
* Initialize the "longest match" routines for a new file
*
* IN assertion: window_size is > 0 if the input file is already read or
* mmap'ed in the window[] array, 0 otherwise. In the first case,
* window_size is sufficient to contain the whole input file plus
* MIN_LOOKAHEAD bytes (to avoid referencing memory beyond the end
* of window[] when looking for matches towards the end).
*/
void lm_init (pack_level, flags)
int pack_level; /* 0: store, 1: best speed, 9: best compression */
ush *flags; /* general purpose bit flag */
{
register unsigned j;
if (pack_level < 1 || pack_level > 9) error("bad pack level");
/* Do not slide the window if the whole input is already in memory
* (window_size > 0)
*/
sliding = 0;
if (window_size == 0L) {
sliding = 1;
window_size = (ulg)2L*WSIZE;
}
/* Use dynamic allocation if compiler does not like big static arrays: */
#ifdef DYN_ALLOC
if (window == NULL) {
window = (uch far *) zcalloc(WSIZE, 2*sizeof(uch));
if (window == NULL) ziperr(ZE_MEM, "window allocation");
}
if (prev == NULL) {
prev = (Pos far *) zcalloc(WSIZE, sizeof(Pos));
head = (Pos far *) zcalloc(HASH_SIZE, sizeof(Pos));
if (prev == NULL || head == NULL) {
ziperr(ZE_MEM, "hash table allocation");
}
}
#endif /* DYN_ALLOC */
/* Initialize the hash table (avoiding 64K overflow for 16 bit systems).
* prev[] will be initialized on the fly.
*/
head[HASH_SIZE-1] = NIL;
memset((char*)head, NIL, (unsigned)(HASH_SIZE-1)*sizeof(*head));
/* Set the default configuration parameters:
*/
max_lazy_match = configuration_table[pack_level].max_lazy;
good_match = configuration_table[pack_level].good_length;
#ifndef FULL_SEARCH
nice_match = configuration_table[pack_level].nice_length;
#endif
max_chain_length = configuration_table[pack_level].max_chain;
if (pack_level <= 2) {
*flags |= FAST;
} else if (pack_level >= 8) {
*flags |= SLOW;
}
/* ??? reduce max_chain_length for binary files */
strstart = 0;
block_start = 0L;
#if defined(ASMV) && !defined(RISCOS)
match_init(); /* initialize the asm code */
#endif
j = WSIZE;
#ifndef MAXSEG_64K
if (sizeof(int) > 2) j <<= 1; /* Can read 64K in one step */
#endif
lookahead = (*read_buf)((char*)window, j);
if (lookahead == 0 || lookahead == (unsigned)EOF) {
eofile = 1, lookahead = 0;
return;
}
eofile = 0;
/* Make sure that we always have enough lookahead. This is important
* if input comes from a device such as a tty.
*/
if (lookahead < MIN_LOOKAHEAD) fill_window();
ins_h = 0;
for (j=0; j<MIN_MATCH-1; j++) UPDATE_HASH(ins_h, window[j]);
/* If lookahead < MIN_MATCH, ins_h is garbage, but this is
* not important since only literal bytes will be emitted.
*/
}
/* ===========================================================================
* Free the window and hash table
*/
void lm_free()
{
#ifdef DYN_ALLOC
if (window != NULL) {
zcfree(window);
window = NULL;
}
if (prev != NULL) {
zcfree(prev);
zcfree(head);
prev = head = NULL;
}
#endif /* DYN_ALLOC */
}
/* ===========================================================================
* Set match_start to the longest match starting at the given string and
* return its length. Matches shorter or equal to prev_length are discarded,
* in which case the result is equal to prev_length and match_start is
* garbage.
* IN assertions: cur_match is the head of the hash chain for the current
* string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
*/
#ifndef ASMV
/* For 80x86 and 680x0 and ARM, an optimized version is in match.asm or
* match.S. The code is functionally equivalent, so you can use the C version
* if desired.
*/
int longest_match(cur_match)
IPos cur_match; /* current match */
{
unsigned chain_length = max_chain_length; /* max hash chain length */
register uch far *scan = window + strstart; /* current string */
register uch far *match; /* matched string */
register int len; /* length of current match */
int best_len = prev_length; /* best match length so far */
IPos limit = strstart > (IPos)MAX_DIST ? strstart - (IPos)MAX_DIST : NIL;
/* Stop when cur_match becomes <= limit. To simplify the code,
* we prevent matches with the string of window index 0.
*/
/* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
* It is easy to get rid of this optimization if necessary.
*/
#if HASH_BITS < 8 || MAX_MATCH != 258
error: Code too clever
#endif
#ifdef UNALIGNED_OK
/* Compare two bytes at a time. Note: this is not always beneficial.
* Try with and without -DUNALIGNED_OK to check.
*/
register uch far *strend = window + strstart + MAX_MATCH - 1;
register ush scan_start = *(ush far *)scan;
register ush scan_end = *(ush far *)(scan+best_len-1);
#else
register uch far *strend = window + strstart + MAX_MATCH;
register uch scan_end1 = scan[best_len-1];
register uch scan_end = scan[best_len];
#endif
/* Do not waste too much time if we already have a good match: */
if (prev_length >= good_match) {
chain_length >>= 2;
}
Assert(strstart <= window_size-MIN_LOOKAHEAD, "insufficient lookahead");
do {
Assert(cur_match < strstart, "no future");
match = window + cur_match;
/* Skip to next match if the match length cannot increase
* or if the match length is less than 2:
*/
#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
/* This code assumes sizeof(unsigned short) == 2. Do not use
* UNALIGNED_OK if your compiler uses a different size.
*/
if (*(ush far *)(match+best_len-1) != scan_end ||
*(ush far *)match != scan_start) continue;
/* It is not necessary to compare scan[2] and match[2] since they are
* always equal when the other bytes match, given that the hash keys
* are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
* strstart+3, +5, ... up to strstart+257. We check for insufficient
* lookahead only every 4th comparison; the 128th check will be made
* at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
* necessary to put more guard bytes at the end of the window, or
* to check more often for insufficient lookahead.
*/
scan++, match++;
do {
} while (*(ush far *)(scan+=2) == *(ush far *)(match+=2) &&
*(ush far *)(scan+=2) == *(ush far *)(match+=2) &&
*(ush far *)(scan+=2) == *(ush far *)(match+=2) &&
*(ush far *)(scan+=2) == *(ush far *)(match+=2) &&
scan < strend);
/* The funny "do {}" generates better code on most compilers */
/* Here, scan <= window+strstart+257 */
Assert(scan <= window+(unsigned)(window_size-1), "wild scan");
if (*scan == *match) scan++;
len = (MAX_MATCH - 1) - (int)(strend-scan);
scan = strend - (MAX_MATCH-1);
#else /* UNALIGNED_OK */
if (match[best_len] != scan_end ||
match[best_len-1] != scan_end1 ||
*match != *scan ||
*++match != scan[1]) continue;
/* The check at best_len-1 can be removed because it will be made
* again later. (This heuristic is not always a win.)
* It is not necessary to compare scan[2] and match[2] since they
* are always equal when the other bytes match, given that
* the hash keys are equal and that HASH_BITS >= 8.
*/
scan += 2, match++;
/* We check for insufficient lookahead only every 8th comparison;
* the 256th check will be made at strstart+258.
*/
do {
} while (*++scan == *++match && *++scan == *++match &&
*++scan == *++match && *++scan == *++match &&
*++scan == *++match && *++scan == *++match &&
*++scan == *++match && *++scan == *++match &&
scan < strend);
Assert(scan <= window+(unsigned)(window_size-1), "wild scan");
len = MAX_MATCH - (int)(strend - scan);
scan = strend - MAX_MATCH;
#endif /* UNALIGNED_OK */
if (len > best_len) {
match_start = cur_match;
best_len = len;
if (len >= nice_match) break;
#ifdef UNALIGNED_OK
scan_end = *(ush far *)(scan+best_len-1);
#else
scan_end1 = scan[best_len-1];
scan_end = scan[best_len];
#endif
}
} while ((cur_match = prev[cur_match & WMASK]) > limit
&& --chain_length != 0);
return best_len;
}
#endif /* ASMV */
#ifdef DEBUG
/* ===========================================================================
* Check that the match at match_start is indeed a match.
*/
local void check_match(start, match, length)
IPos start, match;
int length;
{
/* check that the match is indeed a match */
if (memcmp((char*)window + match,
(char*)window + start, length) != EQUAL) {
fprintf(mesg,
" start %d, match %d, length %d\n",
start, match, length);
error("invalid match");
}
if (verbose > 1) {
fprintf(mesg,"\\[%d,%d]", start-match, length);
#ifndef WINDLL
do { putc(window[start++], mesg); } while (--length != 0);
#else
do { fprintf(stdout,"%c",window[start++]); } while (--length != 0);
#endif
}
}
#else
# define check_match(start, match, length)
#endif
/* ===========================================================================
* Flush the current block, with given end-of-file flag.
* IN assertion: strstart is set to the end of the current match.
*/
#define FLUSH_BLOCK(eof) \
flush_block(block_start >= 0L ? (char*)&window[(unsigned)block_start] : \
(char*)NULL, (ulg)strstart - (ulg)block_start, (eof))
/* ===========================================================================
* Fill the window when the lookahead becomes insufficient.
* Updates strstart and lookahead, and sets eofile if end of input file.
*
* IN assertion: lookahead < MIN_LOOKAHEAD && strstart + lookahead > 0
* OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
* At least one byte has been read, or eofile is set; file reads are
* performed for at least two bytes (required for the translate_eol option).
*/
local void fill_window()
{
register unsigned n, m;
unsigned more; /* Amount of free space at the end of the window. */
do {
more = (unsigned)(window_size - (ulg)lookahead - (ulg)strstart);
/* If the window is almost full and there is insufficient lookahead,
* move the upper half to the lower one to make room in the upper half.
*/
if (more == (unsigned)EOF) {
/* Very unlikely, but possible on 16 bit machine if strstart == 0
* and lookahead == 1 (input done one byte at time)
*/
more--;
/* For MMAP or BIG_MEM, the whole input file is already in memory so
* we must not perform sliding. We must however call (*read_buf)() in
* order to compute the crc, update lookahead and possibly set eofile.
*/
} else if (strstart >= WSIZE+MAX_DIST && sliding) {
#ifdef FORCE_METHOD
/* When methods "stored" or "store_block" are requested, the
* current block must be flushed before sliding the window.
*/
if (level <= 2) FLUSH_BLOCK(0), block_start = strstart;
#endif
/* By the IN assertion, the window is not empty so we can't confuse
* more == 0 with more == 64K on a 16 bit machine.
*/
memcpy((char*)window, (char*)window+WSIZE, (unsigned)WSIZE);
match_start -= WSIZE;
strstart -= WSIZE; /* we now have strstart >= MAX_DIST: */
block_start -= (long) WSIZE;
for (n = 0; n < HASH_SIZE; n++) {
m = head[n];
head[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
}
for (n = 0; n < WSIZE; n++) {
m = prev[n];
prev[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
/* If n is not on any hash chain, prev[n] is garbage but
* its value will never be used.
*/
}
more += WSIZE;
if (dot_size > 0 && !display_globaldots) {
/* initial space */
if (noisy && dot_count == -1) {
#ifndef WINDLL
putc(' ', mesg);
fflush(mesg);
#else
fprintf(stdout,"%c",' ');
#endif
dot_count++;
}
dot_count++;
if (dot_size <= (dot_count + 1) * WSIZE) dot_count = 0;
}
if ((verbose || noisy) && dot_size && !dot_count) {
#ifndef WINDLL
putc('.', mesg);
fflush(mesg);
#else
fprintf(stdout,"%c",'.');
#endif
mesg_line_started = 1;
}
}
if (eofile) return;
/* If there was no sliding:
* strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
* more == window_size - lookahead - strstart
* => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
* => more >= window_size - 2*WSIZE + 2
* In the MMAP or BIG_MEM case (not yet supported in gzip),
* window_size == input_size + MIN_LOOKAHEAD &&
* strstart + lookahead <= input_size => more >= MIN_LOOKAHEAD.
* Otherwise, window_size == 2*WSIZE so more >= 2.
* If there was sliding, more >= WSIZE. So in all cases, more >= 2.
*/
Assert(more >= 2, "more < 2");
n = (*read_buf)((char*)window+strstart+lookahead, more);
if (n == 0 || n == (unsigned)EOF) {
eofile = 1;
} else {
lookahead += n;
}
} while (lookahead < MIN_LOOKAHEAD && !eofile);
}
/* ===========================================================================
* Processes a new input file and return its compressed length. This
* function does not perform lazy evaluation of matches and inserts
* new strings in the dictionary only for unmatched strings or for short
* matches. It is used only for the fast compression options.
*/
local uzoff_t deflate_fast()
{
IPos hash_head = NIL; /* head of the hash chain */
int flush; /* set if current block must be flushed */
unsigned match_length = 0; /* length of best match */
prev_length = MIN_MATCH-1;
while (lookahead != 0) {
/* Insert the string window[strstart .. strstart+2] in the
* dictionary, and set hash_head to the head of the hash chain:
*/
#ifndef DEFL_UNDETERM
if (lookahead >= MIN_MATCH)
#endif
INSERT_STRING(strstart, hash_head);
/* Find the longest match, discarding those <= prev_length.
* At this point we have always match_length < MIN_MATCH
*/
if (hash_head != NIL && strstart - hash_head <= MAX_DIST) {
/* To simplify the code, we prevent matches with the string
* of window index 0 (in particular we have to avoid a match
* of the string with itself at the start of the input file).
*/
#ifndef HUFFMAN_ONLY
# ifndef DEFL_UNDETERM
/* Do not look for matches beyond the end of the input.
* This is necessary to make deflate deterministic.
*/
if ((unsigned)nice_match > lookahead) nice_match = (int)lookahead;
# endif
match_length = longest_match (hash_head);
/* longest_match() sets match_start */
if (match_length > lookahead) match_length = lookahead;
#endif
}
if (match_length >= MIN_MATCH) {
check_match(strstart, match_start, match_length);
flush = ct_tally(strstart-match_start, match_length - MIN_MATCH);
lookahead -= match_length;
/* Insert new strings in the hash table only if the match length
* is not too large. This saves time but degrades compression.
*/
if (match_length <= max_insert_length
#ifndef DEFL_UNDETERM
&& lookahead >= MIN_MATCH
#endif
) {
match_length--; /* string at strstart already in hash table */
do {
strstart++;
INSERT_STRING(strstart, hash_head);
/* strstart never exceeds WSIZE-MAX_MATCH, so there are
* always MIN_MATCH bytes ahead.
*/
#ifdef DEFL_UNDETERM
/* If lookahead < MIN_MATCH these bytes are garbage,
* but it does not matter since the next lookahead bytes
* will be emitted as literals.
*/
#endif
} while (--match_length != 0);
strstart++;
} else {
strstart += match_length;
match_length = 0;
ins_h = window[strstart];
UPDATE_HASH(ins_h, window[strstart+1]);
#if MIN_MATCH != 3
Call UPDATE_HASH() MIN_MATCH-3 more times
#endif
}
} else {
/* No match, output a literal byte */
Tracevv((stderr,"%c",window[strstart]));
flush = ct_tally (0, window[strstart]);
lookahead--;
strstart++;
}
if (flush) FLUSH_BLOCK(0), block_start = strstart;
/* Make sure that we always have enough lookahead, except
* at the end of the input file. We need MAX_MATCH bytes
* for the next match, plus MIN_MATCH bytes to insert the
* string following the next match.
*/
if (lookahead < MIN_LOOKAHEAD) fill_window();
}
return FLUSH_BLOCK(1); /* eof */
}
/* ===========================================================================
* Same as above, but achieves better compression. We use a lazy
* evaluation for matches: a match is finally adopted only if there is
* no better match at the next window position.
*/
uzoff_t deflate()
{
IPos hash_head = NIL; /* head of hash chain */
IPos prev_match; /* previous match */
int flush; /* set if current block must be flushed */
int match_available = 0; /* set if previous match exists */
register unsigned match_length = MIN_MATCH-1; /* length of best match */
#ifdef DEBUG
extern uzoff_t isize; /* byte length of input file, for debug only */
#endif
if (level <= 3) return deflate_fast(); /* optimized for speed */
/* Process the input block. */
while (lookahead != 0) {
/* Insert the string window[strstart .. strstart+2] in the
* dictionary, and set hash_head to the head of the hash chain:
*/
#ifndef DEFL_UNDETERM
if (lookahead >= MIN_MATCH)
#endif
INSERT_STRING(strstart, hash_head);
/* Find the longest match, discarding those <= prev_length.
*/
prev_length = match_length, prev_match = match_start;
match_length = MIN_MATCH-1;
if (hash_head != NIL && prev_length < max_lazy_match &&
strstart - hash_head <= MAX_DIST) {
/* To simplify the code, we prevent matches with the string
* of window index 0 (in particular we have to avoid a match
* of the string with itself at the start of the input file).
*/
#ifndef HUFFMAN_ONLY
# ifndef DEFL_UNDETERM
/* Do not look for matches beyond the end of the input.
* This is necessary to make deflate deterministic.
*/
if ((unsigned)nice_match > lookahead) nice_match = (int)lookahead;
# endif
match_length = longest_match (hash_head);
/* longest_match() sets match_start */
if (match_length > lookahead) match_length = lookahead;
#endif
#ifdef FILTERED
/* Ignore matches of length <= 5 */
if (match_length <= 5) {
#else
/* Ignore a length 3 match if it is too distant: */
if (match_length == MIN_MATCH && strstart-match_start > TOO_FAR){
#endif
/* If prev_match is also MIN_MATCH, match_start is garbage
* but we will ignore the current match anyway.
*/
match_length = MIN_MATCH-1;
}
}
/* If there was a match at the previous step and the current
* match is not better, output the previous match:
*/
if (prev_length >= MIN_MATCH && match_length <= prev_length) {
#ifndef DEFL_UNDETERM
unsigned max_insert = strstart + lookahead - MIN_MATCH;
#endif
check_match(strstart-1, prev_match, prev_length);
flush = ct_tally(strstart-1-prev_match, prev_length - MIN_MATCH);
/* Insert in hash table all strings up to the end of the match.
* strstart-1 and strstart are already inserted.
*/
lookahead -= prev_length-1;
prev_length -= 2;
#ifndef DEFL_UNDETERM
do {
if (++strstart <= max_insert) {
INSERT_STRING(strstart, hash_head);
/* strstart never exceeds WSIZE-MAX_MATCH, so there are
* always MIN_MATCH bytes ahead.
*/
}
} while (--prev_length != 0);
strstart++;
#else /* DEFL_UNDETERM */
do {
strstart++;
INSERT_STRING(strstart, hash_head);
/* strstart never exceeds WSIZE-MAX_MATCH, so there are
* always MIN_MATCH bytes ahead. If lookahead < MIN_MATCH
* these bytes are garbage, but it does not matter since the
* next lookahead bytes will always be emitted as literals.
*/
} while (--prev_length != 0);
strstart++;
#endif /* ?DEFL_UNDETERM */
match_available = 0;
match_length = MIN_MATCH-1;
if (flush) FLUSH_BLOCK(0), block_start = strstart;
} else if (match_available) {
/* If there was no match at the previous position, output a
* single literal. If there was a match but the current match
* is longer, truncate the previous match to a single literal.
*/
Tracevv((stderr,"%c",window[strstart-1]));
if (ct_tally (0, window[strstart-1])) {
FLUSH_BLOCK(0), block_start = strstart;
}
strstart++;
lookahead--;
} else {
/* There is no previous match to compare with, wait for
* the next step to decide.
*/
match_available = 1;
strstart++;
lookahead--;
}
Assert(strstart <= isize && lookahead <= isize, "a bit too far");
/* Make sure that we always have enough lookahead, except
* at the end of the input file. We need MAX_MATCH bytes
* for the next match, plus MIN_MATCH bytes to insert the
* string following the next match.
*/
if (lookahead < MIN_LOOKAHEAD) fill_window();
}
if (match_available) ct_tally (0, window[strstart-1]);
return FLUSH_BLOCK(1); /* eof */
}
#endif /* !USE_ZLIB */
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