* files as well as stdin/stdout, and to generally behave itself wrt
* command line handling.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* These defines are very important for BusyBox. Without these,
* terms of the GNU General Public License, see the file COPYING.
*/
-#if !defined(OF) && defined(lint)
-# include "gzip.h"
-#endif
-
#ifndef BITS
# define BITS 16
#endif
static unsigned insize; /* valid bytes in inbuf */
static unsigned outcnt; /* bytes in output buffer */
+static uint32_t *crc_32_tab;
/* Output a 16 bit value, lsb first */
static void put_short(ush w)
/* ========================================================================
* Signal and error handler.
*/
-static void abort_gzip(int ignored)
+static void abort_gzip(int ATTRIBUTE_UNUSED ignored)
{
exit(ERROR);
}
* pointer, then initialize the crc shift register contents instead.
* Return the current crc in either case.
*/
-static ulg updcrc(uch * s, unsigned n)
+static uint32_t updcrc(uch * s, unsigned n)
{
- static ulg crc = (ulg) 0xffffffffL; /* shift register contents */
- register ulg c; /* temporary variable */
- static unsigned long crc_32_tab[256];
-
- if (crc_32_tab[1] == 0x00000000L) {
- unsigned long csr; /* crc shift register */
- const unsigned long e = 0xedb88320L; /* polynomial exclusive-or pattern */
- int i; /* counter for all possible eight bit values */
- int k; /* byte being shifted into crc apparatus */
-
- /* Compute table of CRC's. */
- for (i = 1; i < 256; i++) {
- csr = i;
- /* The idea to initialize the register with the byte instead of
- * zero was stolen from Haruhiko Okumura's ar002
- */
- for (k = 8; k; k--)
- csr = csr & 1 ? (csr >> 1) ^ e : csr >> 1;
- crc_32_tab[i] = csr;
- }
- }
+ static uint32_t crc = ~0; /* shift register contents */
+ uint32_t c; /* temporary variable */
if (s == NULL) {
- c = 0xffffffffL;
+ c = ~0;
} else {
c = crc;
if (n)
} while (--n);
}
crc = c;
- return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+ return ~c;
}
/* bits.c -- output variable-length bit strings
static int eofile; /* flag set at end of input file */
static unsigned lookahead; /* number of valid bytes ahead in window */
-static const unsigned max_chain_length = 4096;
+enum {
+ max_chain_length = 4096,
/* To speed up deflation, hash chains are never searched beyond this length.
* A higher limit improves compression ratio but degrades the speed.
*/
-static const unsigned int max_lazy_match = 258;
+ max_lazy_match = 258,
/* 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
+ 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.
*/
-static const unsigned good_match = 32;
+ good_match = 32,
/* Use a faster search when the previous match is longer than this */
* found for specific files.
*/
-static const int nice_match = 258; /* Stop searching when current match exceeds this */
+ nice_match = 258 /* Stop searching when current match exceeds this */
/* 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 */
*/
#define FLUSH_BLOCK(eof) \
flush_block(block_start >= 0L ? (char*)&window[(unsigned)block_start] : \
- (char*)NULL, (long)strstart - block_start, (eof))
+ (char*)NULL, (long)strstart - block_start, (eof))
/* ===========================================================================
* Same as above, but achieves better compression. We use a lazy
ALLOC(uch, window, 2L * WSIZE);
ALLOC(ush, tab_prefix, 1L << BITS);
+ /* Initialise the CRC32 table */
+ crc_32_tab = bb_crc32_filltable(0);
+
clear_bufs();
part_nb = 0;
inFileNum = STDIN_FILENO;
outFileNum = STDOUT_FILENO;
} else {
- inFileNum = open(argv[i], O_RDONLY);
- if (inFileNum < 0 || fstat(inFileNum, &statBuf) < 0)
+ inFileNum = bb_xopen3(argv[i], O_RDONLY, 0);
+ if (fstat(inFileNum, &statBuf) < 0)
bb_perror_msg_and_die("%s", argv[i]);
time_stamp = statBuf.st_ctime;
ifile_size = statBuf.st_size;
strcat(path, ".gz");
/* Open output file */
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) && defined O_NOFOLLOW
outFileNum =
open(path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
#else
*/
-static ulg crc; /* crc on uncompressed file data */
+static uint32_t crc; /* crc on uncompressed file data */
static long header_bytes; /* number of bytes in gzip header */
static void put_long(ulg n)
projects / oweals / busybox.git / blobdiff