#endif
/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
-#ifndef RSYNC_WIN
-# define RSYNC_WIN 8192
-#endif
-/* Size of rsync window, must be < MAX_DIST */
-
-#define RSYNC_SUM_MATCH(sum) (((sum) & (RSYNC_WIN - 1)) == 0)
-/* Whether window sum matches magic value */
-
/* ===========================================================================
* Local data used by the "longest match" routines.
*/
unsigned good_match;
/* Use a faster search when the previous match is longer than this */
-local ulg rsync_sum; /* rolling sum of rsync window */
-local ulg rsync_chunk_end; /* next rsync sequence point */
/* Values for max_lazy_match, good_match and max_chain_length, depending on
* the desired pack level (0..9). The values given below have been tuned to
#endif
/* prev will be initialized on the fly */
- /* rsync params */
- rsync_chunk_end = 0xFFFFFFFFUL;
- rsync_sum = 0;
-
/* Set the default configuration parameters:
*/
max_lazy_match = configuration_table[pack_level].max_lazy;
memcpy((char*)window, (char*)window+WSIZE, (unsigned)WSIZE);
match_start -= WSIZE;
strstart -= WSIZE; /* we now have strstart >= MAX_DIST: */
- if (rsync_chunk_end != 0xFFFFFFFFUL)
- rsync_chunk_end -= WSIZE;
block_start -= (long) WSIZE;
}
}
-local void rsync_roll(unsigned start, unsigned num)
-{
- unsigned i;
-
- if (start < RSYNC_WIN) {
- /* before window fills. */
- for (i = start; i < RSYNC_WIN; i++) {
- if (i == start + num) return;
- rsync_sum += (ulg)window[i];
- }
- num -= (RSYNC_WIN - start);
- start = RSYNC_WIN;
- }
-
- /* buffer after window full */
- for (i = start; i < start+num; i++) {
- /* New character in */
- rsync_sum += (ulg)window[i];
- /* Old character out */
- rsync_sum -= (ulg)window[i - RSYNC_WIN];
- if (rsync_chunk_end == 0xFFFFFFFFUL && RSYNC_SUM_MATCH(rsync_sum))
- rsync_chunk_end = i;
- }
-}
-
-/* ===========================================================================
- * Set rsync_chunk_end if window sum matches magic value.
- */
-#define RSYNC_ROLL(s, n) \
- do { if (rsync) rsync_roll((s), (n)); } while(0)
-
/* ===========================================================================
* 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, (long)strstart - block_start, flush-1, (eof))
+ (char*)NULL, (long)strstart - block_start, (eof))
/* ===========================================================================
* Processes a new input file and return its compressed length. This
local off_t deflate_fast()
{
IPos hash_head; /* head of the hash chain */
- int flush = 0; /* set if current block must be flushed, 2=>and padded */
+ int flush; /* set if current block must be flushed */
unsigned match_length = 0; /* length of best match */
prev_length = MIN_MATCH-1;
lookahead -= match_length;
- RSYNC_ROLL(strstart, match_length);
- /* Insert new strings in the hash table only if the 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) {
/* No match, output a literal byte */
Tracevv((stderr,"%c",window[strstart]));
flush = ct_tally (0, window[strstart]);
- RSYNC_ROLL(strstart, 1);
lookahead--;
strstart++;
}
- if (rsync && strstart > rsync_chunk_end) {
- flush = 2;
- rsync_chunk_end = 0xFFFFFFFFUL;
- }
if (flush) FLUSH_BLOCK(0), block_start = strstart;
/* Make sure that we always have enough lookahead, except
{
IPos hash_head; /* head of hash chain */
IPos prev_match; /* previous match */
- int flush = 0; /* set if current block must be flushed */
+ 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 */
*/
lookahead -= prev_length-1;
prev_length -= 2;
- RSYNC_ROLL(strstart, prev_length+1);
do {
strstart++;
INSERT_STRING(strstart, hash_head);
match_available = 0;
match_length = MIN_MATCH-1;
strstart++;
-
- if (rsync && strstart > rsync_chunk_end) {
- rsync_chunk_end = 0xFFFFFFFFUL;
- flush = 2;
- }
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]));
- flush = ct_tally (0, window[strstart-1]);
- if (rsync && strstart > rsync_chunk_end) {
- rsync_chunk_end = 0xFFFFFFFFUL;
- flush = 2;
- }
- if (flush) FLUSH_BLOCK(0), block_start = strstart;
- RSYNC_ROLL(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.
*/
- if (rsync && strstart > rsync_chunk_end) {
- rsync_chunk_end = 0xFFFFFFFFUL;
- flush = 2;
- FLUSH_BLOCK(0), block_start = strstart;
- }
match_available = 1;
- RSYNC_ROLL(strstart, 1);
strstart++;
lookahead--;
}
@setchapternewpage odd
@c %**end of header
@copying
-This manual is for GNU Gzip (version @value{VERSION}),
+This manual is for GNU Gzip
+(version @value{VERSION}, @value{UPDATED}),
and documents commands for compressing and decompressing data.
Copyright @copyright{} 1998-1999, 2001-2002, 2006-2007, 2009-2013 Free Software
-V, --version display version number
-1, --fast compress faster
-9, --best compress better
- --rsyncable Make rsync-friendly archive
With no FILE, or when FILE is -, read standard input.
into the directory and compress all the files it finds there (or
decompress them in the case of @command{gunzip}).
-@item --rsyncable
-While compressing, synchronize the output occasionally based on
-the input. This increases size by less than 1 percent most
-cases, but means that the @command{rsync} program can much more efficiently
-synchronize files compressed with this flag. @command{gunzip}
-cannot tell the difference between a compressed file created
-with this option, and one created without it.
-
@item --suffix @var{suf}
@itemx -S @var{suf}
Use suffix @var{suf} instead of @samp{.gz}. Any suffix can be
.ll +8
.B gzip
.RB [ " \-acdfhklLnNrtvV19 " ]
-.RB [ --rsyncable ]
.RB [ \-S\ suffix ]
[
.I "name \&..."
.I gunzip
).
.TP
-.B --rsyncable
-While compressing, synchronize the output occasionally based on the input.
-This increases size by less than 1 percent most cases, but means that the
-.BR rsync (1)
-program can take advantage of similarities in the uncompressed input
-when synchronizing two files compressed with this flag.
-.I gunzip
-cannot tell the difference between a compressed file created with this option,
-and one created without it.
-.TP
.B \-S .suf --suffix .suf
When compressing, use suffix .suf instead of .gz.
Any non-empty suffix can be given, but suffixes
unsigned insize; /* valid bytes in inbuf */
unsigned inptr; /* index of next byte to be processed in inbuf */
unsigned outcnt; /* bytes in output buffer */
-int rsync = 0; /* make ryncable chunks */
static int handled_sig[] =
{
{"best", 0, 0, '9'}, /* compress better */
{"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
{"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
- {"rsyncable", 0, 0, 'R'}, /* make rsync-friendly archive */
+
{ 0, 0, 0, 0 }
};
" -Z, --lzw produce output compatible with old compress",
" -b, --bits=BITS max number of bits per code (implies -Z)",
#endif
- " --rsyncable Make rsync-friendly archive",
"",
"With no FILE, or when FILE is -, read standard input.",
"",
#else
recursive = 1;
#endif
- break;
- case 'R':
- rsync = 1; break;
-
- case 'S':
+ break;
+ case 'S':
#ifdef NO_MULTIPLE_DOTS
if (*optarg == '.') optarg++;
#endif
ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
#endif
-#ifdef SIGPIPE
exiting_signal = quiet ? SIGPIPE : 0;
-#else
- exiting_signal = 0;
-#endif
install_signal_handlers ();
/* And get to work */
extern unsigned insize; /* valid bytes in inbuf */
extern unsigned inptr; /* index of next byte to be processed in inbuf */
extern unsigned outcnt; /* bytes in output buffer */
-extern int rsync; /* deflate into rsyncable chunks */
extern off_t bytes_in; /* number of input bytes */
extern off_t bytes_out; /* number of output bytes */
/* in trees.c */
extern void ct_init (ush *attr, int *method);
extern int ct_tally (int dist, int lc);
-extern off_t flush_block (char *buf, ulg stored_len, int pad, int eof);
+extern off_t flush_block (char *buf, ulg stored_len, int eof);
/* in bits.c */
extern void bi_init (file_t zipfile);
# if MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
-static void __cdecl
+static void cdecl
gl_msvc_invalid_parameter_handler (const wchar_t *expression,
const wchar_t *function,
const wchar_t *file,
# if defined _MSC_VER
-static void __cdecl
+static void cdecl
gl_msvc_invalid_parameter_handler (const wchar_t *expression,
const wchar_t *function,
const wchar_t *file,
}
}
-static void __cdecl
+static void cdecl
gl_msvc_invalid_parameter_handler (const wchar_t *expression,
const wchar_t *function,
const wchar_t *file,
* trees or store, and output the encoded block to the zip file. This function
* returns the total compressed length for the file so far.
*/
-off_t flush_block(buf, stored_len, pad, eof)
+off_t flush_block(buf, stored_len, eof)
char *buf; /* input block, or NULL if too old */
ulg stored_len; /* length of input block */
- int pad; /* pad output to byte boundary */
int eof; /* true if this is the last block for a file */
{
ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
Assert (input_len == bytes_in, "bad input size");
bi_windup();
compressed_len += 7; /* align on byte boundary */
- } else if (pad && (compressed_len % 8) != 0) {
- send_bits((STORED_BLOCK<<1)+eof, 3); /* send block type */
- compressed_len = (compressed_len + 3 + 7) & ~7L;
- copy_block(buf, 0, 1); /* with header */
}
return compressed_len >> 3;
invokes
.I grep
on compressed or gzipped files.
-These
-.I grep
-options will cause
-.I zgrep
-to terminate with an error code:
-.BI (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*) .
-All other options specified are passed directly to
+All options specified are passed directly to
.IR grep .
If no file is specified, then the standard input is decompressed
if necessary and fed to grep.
uses it as the
.I grep
program to be invoked.
-.SH EXIT CODE
-2 - An option that is not supported was specified.
.SH AUTHOR
Charles Levert (charles@comm.polymtl.ca)
.SH "SEE ALSO"
projects / debian / gzip / commitdiff