-/* gzip.c -- this is a stripped down version of gzip I put into busybox, it does
- * only standard in to standard out with -9 compression. It also requires the
- * zcat module for some important functions.
+/* vi: set sw=4 ts=4: */
+/*
+ * Gzip implementation for busybox
+ *
+ * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly.
+ *
+ * Originally adjusted for busybox by Charles P. Wright <cpw@unix.asb.com>
+ * "this is a stripped down version of gzip I put into busybox, it does
+ * only standard in to standard out with -9 compression. It also requires
+ * the zcat module for some important functions."
+ *
+ * Adjusted further by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * to support 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
*
- * Charles P. Wright <cpw@unix.asb.com>
- */
-#include "internal.h"
-#ifdef BB_GZIP
-
-#ifndef BB_ZCAT
-error: you need zcat to have gzip support!
-#endif
-
-const char gzip_usage[] = "gzip\nignores all command line arguments\ncompress stdin to stdout with -9 compression\n";
-
-/* gzip.h -- common declarations for all gzip modules
- * Copyright (C) 1992-1993 Jean-loup Gailly.
- * This is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License, see the file COPYING.
*/
-#if defined(__STDC__) || defined(PROTO)
-# define OF(args) args
-#else
-# define OF(args) ()
-#endif
+#include "busybox.h"
+#define BB_DECLARE_EXTERN
+#define bb_need_memory_exhausted
+#include "messages.c"
-#ifdef __STDC__
- typedef void *voidp;
-#else
- typedef char *voidp;
-#endif
+/* These defines are very important for BusyBox. Without these,
+ * huge chunks of ram are pre-allocated making the BusyBox bss
+ * size Freaking Huge(tm), which is a bad thing.*/
+#define SMALL_MEM
+#define DYN_ALLOC
/* I don't like nested includes, but the string and io functions are used
* too often
*/
#include <stdio.h>
-#if !defined(NO_STRING_H) || defined(STDC_HEADERS)
-# include <string.h>
-# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
-# include <memory.h>
-# endif
-# define memzero(s, n) memset ((voidp)(s), 0, (n))
-#else
-# include <strings.h>
-# define strchr index
-# define strrchr rindex
-# define memcpy(d, s, n) bcopy((s), (d), (n))
-# define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
-# define memzero(s, n) bzero((s), (n))
-#endif
+#include <string.h>
+#define memzero(s, n) memset ((void *)(s), 0, (n))
#ifndef RETSIGTYPE
# define RETSIGTYPE void
#define local static
-typedef unsigned char uch;
+typedef unsigned char uch;
typedef unsigned short ush;
-typedef unsigned long ulg;
+typedef unsigned long ulg;
/* Return codes from gzip */
#define OK 0
/* methods 4 to 7 reserved */
#define DEFLATED 8
#define MAX_METHODS 9
-extern int method; /* compression method */
+extern int method; /* compression method */
/* To save memory for 16 bit systems, some arrays are overlaid between
* the various modules:
#ifndef INBUFSIZ
# ifdef SMALL_MEM
-# define INBUFSIZ 0x2000 /* input buffer size */
+# define INBUFSIZ 0x2000 /* input buffer size */
# else
-# define INBUFSIZ 0x8000 /* input buffer size */
+# define INBUFSIZ 0x8000 /* input buffer size */
# endif
#endif
-#define INBUF_EXTRA 64 /* required by unlzw() */
+#define INBUF_EXTRA 64 /* required by unlzw() */
#ifndef OUTBUFSIZ
# ifdef SMALL_MEM
-# define OUTBUFSIZ 8192 /* output buffer size */
+# define OUTBUFSIZ 8192 /* output buffer size */
# else
-# define OUTBUFSIZ 16384 /* output buffer size */
+# define OUTBUFSIZ 16384 /* output buffer size */
# endif
#endif
-#define OUTBUF_EXTRA 2048 /* required by unlzw() */
+#define OUTBUF_EXTRA 2048 /* required by unlzw() */
#ifndef DIST_BUFSIZE
# ifdef SMALL_MEM
-# define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
+# define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
# else
-# define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
+# define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
# endif
#endif
#ifdef DYN_ALLOC
-# define EXTERN(type, array) extern type * near array
-# define DECLARE(type, array, size) type * near array
+# define EXTERN(type, array) extern type * array
+# define DECLARE(type, array, size) type * array
# define ALLOC(type, array, size) { \
- array = (type*)fcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
- if (array == NULL) error("insufficient memory"); \
+ array = (type*)calloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
+ if (array == NULL) errorMsg(memory_exhausted); \
}
-# define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
+# define FREE(array) {if (array != NULL) free(array), array=NULL;}
#else
# define EXTERN(type, array) extern type array[]
# define DECLARE(type, array, size) type array[size]
# define FREE(array)
#endif
-EXTERN(uch, inbuf); /* input buffer */
-EXTERN(uch, outbuf); /* output buffer */
-EXTERN(ush, d_buf); /* buffer for distances, see trees.c */
-EXTERN(uch, window); /* Sliding window and suffix table (unlzw) */
+EXTERN(uch, inbuf); /* input buffer */
+EXTERN(uch, outbuf); /* output buffer */
+EXTERN(ush, d_buf); /* buffer for distances, see trees.c */
+EXTERN(uch, window); /* Sliding window and suffix table (unlzw) */
#define tab_suffix window
#ifndef MAXSEG_64K
-# define tab_prefix prev /* hash link (see deflate.c) */
-# define head (prev+WSIZE) /* hash head (see deflate.c) */
- EXTERN(ush, tab_prefix); /* prefix code (see unlzw.c) */
+# define tab_prefix prev /* hash link (see deflate.c) */
+# define head (prev+WSIZE) /* hash head (see deflate.c) */
+EXTERN(ush, tab_prefix); /* prefix code (see unlzw.c) */
#else
# define tab_prefix0 prev
# define head tab_prefix1
- EXTERN(ush, tab_prefix0); /* prefix for even codes */
- EXTERN(ush, tab_prefix1); /* prefix for odd codes */
+EXTERN(ush, tab_prefix0); /* prefix for even codes */
+EXTERN(ush, tab_prefix1); /* prefix for odd codes */
#endif
-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 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 long bytes_in; /* number of input bytes */
-extern long bytes_out; /* number of output bytes */
-extern long header_bytes;/* number of bytes in gzip header */
+extern long bytes_in; /* number of input bytes */
+extern long bytes_out; /* number of output bytes */
+extern long header_bytes; /* number of bytes in gzip header */
#define isize bytes_in
/* for compatibility with old zip sources (to be cleaned) */
-extern int ifd; /* input file descriptor */
-extern int ofd; /* output file descriptor */
-extern char ifname[]; /* input file name or "stdin" */
-extern char ofname[]; /* output file name or "stdout" */
-extern char *progname; /* program name */
+extern int ifd; /* input file descriptor */
+extern int ofd; /* output file descriptor */
+extern char ifname[]; /* input file name or "stdin" */
+extern char ofname[]; /* output file name or "stdout" */
+extern char *progname; /* program name */
-extern long time_stamp; /* original time stamp (modification time) */
-extern long ifile_size; /* input file size, -1 for devices (debug only) */
+extern long time_stamp; /* original time stamp (modification time) */
+extern long ifile_size; /* input file size, -1 for devices (debug only) */
-typedef int file_t; /* Do not use stdio */
-#define NO_FILE (-1) /* in memory compression */
+typedef int file_t; /* Do not use stdio */
+#define NO_FILE (-1) /* in memory compression */
-#define PACK_MAGIC "\037\036" /* Magic header for packed files */
-#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
-#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
-#define LZH_MAGIC "\037\240" /* Magic header for SCO LZH Compress files*/
-#define PKZIP_MAGIC "\120\113\003\004" /* Magic header for pkzip files */
+
+#define PACK_MAGIC "\037\036" /* Magic header for packed files */
+#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
+#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
+#define LZH_MAGIC "\037\240" /* Magic header for SCO LZH Compress files */
+#define PKZIP_MAGIC "\120\113\003\004" /* Magic header for pkzip files */
/* gzip flag byte */
-#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
-#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
-#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
-#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
-#define COMMENT 0x10 /* bit 4 set: file comment present */
-#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
-#define RESERVED 0xC0 /* bit 6,7: reserved */
+#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
+#define COMMENT 0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
+#define RESERVED 0xC0 /* bit 6,7: reserved */
/* internal file attribute */
#define UNKNOWN 0xffff
#define ASCII 1
#ifndef WSIZE
-# define WSIZE 0x8000 /* window size--must be a power of two, and */
-#endif /* at least 32K for zip's deflate method */
+# define WSIZE 0x8000 /* window size--must be a power of two, and */
+#endif /* at least 32K for zip's deflate method */
#define MIN_MATCH 3
#define MAX_MATCH 258
* distances are limited to MAX_DIST instead of WSIZE.
*/
-extern int decrypt; /* flag to turn on decryption */
-extern int exit_code; /* program exit code */
-extern int verbose; /* be verbose (-v) */
-extern int quiet; /* be quiet (-q) */
-extern int test; /* check .z file integrity */
-extern int to_stdout; /* output to stdout (-c) */
-extern int save_orig_name; /* set if original name must be saved */
+extern int decrypt; /* flag to turn on decryption */
+extern int exit_code; /* program exit code */
+extern int verbose; /* be verbose (-v) */
+extern int quiet; /* be quiet (-q) */
+extern int test; /* check .z file integrity */
+extern int save_orig_name; /* set if original name must be saved */
#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
#define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
put_short(((ulg)(n)) >> 16); \
}
-#define seekable() 0 /* force sequential output */
-#define translate_eol 0 /* no option -a yet */
+#define seekable() 0 /* force sequential output */
+#define translate_eol 0 /* no option -a yet */
-#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
+#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
/* Macros for getting two-byte and four-byte header values */
#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
/* Diagnostic functions */
#ifdef DEBUG
-# define Assert(cond,msg) {if(!(cond)) error(msg);}
+# define Assert(cond,msg) {if(!(cond)) errorMsg(msg);}
# define Trace(x) fprintf x
# define Tracev(x) {if (verbose) fprintf x ;}
# define Tracevv(x) {if (verbose>1) fprintf x ;}
#define WARN(msg) {if (!quiet) fprintf msg ; \
if (exit_code == OK) exit_code = WARNING;}
-local void do_exit(int exitcode);
/* in zip.c: */
-extern int zip OF((int in, int out));
-extern int file_read OF((char *buf, unsigned size));
+extern int zip (int in, int out);
+extern int file_read (char *buf, unsigned size);
/* in unzip.c */
-extern int unzip OF((int in, int out));
-extern int check_zipfile OF((int in));
+extern int unzip (int in, int out);
+extern int check_zipfile (int in);
/* in unpack.c */
-extern int unpack OF((int in, int out));
+extern int unpack (int in, int out);
/* in unlzh.c */
-extern int unlzh OF((int in, int out));
+extern int unlzh (int in, int out);
/* in gzip.c */
-RETSIGTYPE abort_gzip OF((void));
+RETSIGTYPE abort_gzip (void);
- /* in deflate.c */
-void lm_init OF((ush *flags));
-ulg deflate OF((void));
+ /* in deflate.c */
+void lm_init (ush * flags);
+ulg deflate (void);
- /* in trees.c */
-void ct_init OF((ush *attr, int *method));
-int ct_tally OF((int dist, int lc));
-ulg flush_block OF((char *buf, ulg stored_len, int eof));
+ /* in trees.c */
+void ct_init (ush * attr, int *method);
+int ct_tally (int dist, int lc);
+ulg flush_block (char *buf, ulg stored_len, int eof);
- /* in bits.c */
-void bi_init OF((file_t zipfile));
-void send_bits OF((int value, int length));
-unsigned bi_reverse OF((unsigned value, int length));
-void bi_windup OF((void));
-void copy_block OF((char *buf, unsigned len, int header));
-extern int (*read_buf) OF((char *buf, unsigned size));
+ /* in bits.c */
+void bi_init (file_t zipfile);
+void send_bits (int value, int length);
+unsigned bi_reverse (unsigned value, int length);
+void bi_windup (void);
+void copy_block (char *buf, unsigned len, int header);
+extern int (*read_buf) (char *buf, unsigned size);
/* in util.c: */
-extern int copy OF((int in, int out));
-extern ulg updcrc OF((uch *s, unsigned n));
-extern void clear_bufs OF((void));
-extern int fill_inbuf OF((int eof_ok));
-extern void flush_outbuf OF((void));
-extern void flush_window OF((void));
-extern void write_buf OF((int fd, voidp buf, unsigned cnt));
-extern char *strlwr OF((char *s));
-extern char *add_envopt OF((int *argcp, char ***argvp, char *env));
-extern void error OF((char *m));
-extern void warn OF((char *a, char *b));
-extern void read_error OF((void));
-extern void write_error OF((void));
-extern void display_ratio OF((long num, long den, FILE *file));
-extern voidp xmalloc OF((unsigned int size));
+extern int copy (int in, int out);
+extern ulg updcrc (uch * s, unsigned n);
+extern void clear_bufs (void);
+extern int fill_inbuf (int eof_ok);
+extern void flush_outbuf (void);
+extern void flush_window (void);
+extern void write_buf (int fd, void * buf, unsigned cnt);
+extern char *strlwr (char *s);
+extern char *add_envopt (int *argcp, char ***argvp, char *env);
+extern void read_error_msg (void);
+extern void write_error_msg (void);
+extern void display_ratio (long num, long den, FILE * file);
/* in inflate.c */
-extern int inflate OF((void));
+extern int inflate (void);
+
/* lzw.h -- define the lzw functions.
* Copyright (C) 1992-1993 Jean-loup Gailly.
* This is free software; you can redistribute it and/or modify it under the
#ifndef BITS
# define BITS 16
#endif
-#define INIT_BITS 9 /* Initial number of bits per code */
+#define INIT_BITS 9 /* Initial number of bits per code */
-#define BIT_MASK 0x1f /* Mask for 'number of compression bits' */
+#define BIT_MASK 0x1f /* Mask for 'number of compression bits' */
/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
* It's a pity that old uncompress does not check bit 0x20. That makes
* extension of the format actually undesirable because old compress
* clear the dictionary.
*/
-#define LZW_RESERVED 0x60 /* reserved bits */
+#define LZW_RESERVED 0x60 /* reserved bits */
-#define CLEAR 256 /* flush the dictionary */
-#define FIRST (CLEAR+1) /* first free entry */
+#define CLEAR 256 /* flush the dictionary */
+#define FIRST (CLEAR+1) /* first free entry */
-extern int maxbits; /* max bits per code for LZW */
-extern int block_mode; /* block compress mode -C compatible with 2.0 */
+extern int maxbits; /* max bits per code for LZW */
+extern int block_mode; /* block compress mode -C compatible with 2.0 */
/* revision.h -- define the version number
* Copyright (C) 1992-1993 Jean-loup Gailly.
# undef LZW
#endif
-/* $Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $ */
/* tailor.h -- target dependent definitions
* Copyright (C) 1992-1993 Jean-loup Gailly.
* This is free software; you can redistribute it and/or modify it under the
* The target dependent functions should be defined in tailor.c.
*/
-/* $Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $ */
#if defined(__MSDOS__) && !defined(MSDOS)
# define MSDOS
# define OS2
#endif
-#if defined(OS2) && defined(MSDOS) /* MS C under OS/2 */
+#if defined(OS2) && defined(MSDOS) /* MS C under OS/2 */
# undef MSDOS
#endif
#ifdef MSDOS
# ifdef __GNUC__
- /* DJGPP version 1.09+ on MS-DOS.
- * The DJGPP 1.09 stat() function must be upgraded before gzip will
- * fully work.
- * No need for DIRENT, since <unistd.h> defines POSIX_SOURCE which
- * implies DIRENT.
- */
+ /* DJGPP version 1.09+ on MS-DOS.
+ * The DJGPP 1.09 stat() function must be upgraded before gzip will
+ * fully work.
+ * No need for DIRENT, since <unistd.h> defines POSIX_SOURCE which
+ * implies DIRENT.
+ */
# define near
# else
# define MAXSEG_64K
# else
# define NO_UTIME
# endif
-# else /* MSC */
+# else /* MSC */
# define HAVE_SYS_UTIME_H
# define NO_UTIME_H
# endif
# define PROTO
# define STDC_HEADERS
# define NO_SIZE_CHECK
-# define casemap(c) tolow(c) /* Force file names to lower case */
+# define casemap(c) tolow(c) /* Force file names to lower case */
# include <io.h>
# define OS_CODE 0x00
# define SET_BINARY_MODE(fd) setmode(fd, O_BINARY)
# endif
#endif
-#ifdef WIN32 /* Windows NT */
+#ifdef WIN32 /* Windows NT */
# define HAVE_SYS_UTIME_H
# define NO_UTIME_H
# define PATH_SEP2 '\\'
# define NO_MULTIPLE_DOTS
# define MAX_EXT_CHARS 3
# define Z_SUFFIX "z"
-# define casemap(c) tolow(c) /* Force file names to lower case */
+# define casemap(c) tolow(c) /* Force file names to lower case */
# endif
# define OS_CODE 0x0b
#endif
# ifdef __TURBOC__
# include <alloc.h>
# define DYN_ALLOC
- /* Turbo C 2.0 does not accept static allocations of large arrays */
- void * fcalloc (unsigned items, unsigned size);
- void fcfree (void *ptr);
-# else /* MSC */
+ /* Turbo C 2.0 does not accept static allocations of large arrays */
+void *fcalloc(unsigned items, unsigned size);
+void fcfree(void *ptr);
+# else /* MSC */
# include <malloc.h>
# define fcalloc(nitems,itemsize) halloc((long)(nitems),(itemsize))
# define fcfree(ptr) hfree(ptr)
# ifdef __GNUC__
# define DIRENT
# define HAVE_UNISTD_H
-# else /* SASC */
+# else /* SASC */
# define NO_STDIN_FSTAT
# define SYSDIR
# define NO_SYMLINK
# define NO_CHOWN
# define NO_FCNTL_H
-# include <fcntl.h> /* for read() and write() */
+# include <fcntl.h> /* for read() and write() */
# define direct dirent
- extern void _expand_args(int *argc, char ***argv);
+extern void _expand_args(int *argc, char ***argv);
+
# define EXPAND(argc,argv) _expand_args(&argc,&argv);
-# undef O_BINARY /* disable useless --ascii option */
+# undef O_BINARY /* disable useless --ascii option */
# endif
#endif
# define MAX_EXT_CHARS 3
# define Z_SUFFIX "z"
# define NO_CHOWN
-# define casemap(c) tolow(c) /* Force file names to lower case */
+# define casemap(c) tolow(c) /* Force file names to lower case */
# define NO_SYMLINK
# endif
#endif
# endif
#endif
-#ifdef __50SERIES /* Prime/PRIMOS */
+#ifdef __50SERIES /* Prime/PRIMOS */
# define PATH_SEP '>'
# define STDC_HEADERS
# define NO_MEMORY_H
# define NO_UTIME_H
# define NO_UTIME
-# define NO_CHOWN
-# define NO_STDIN_FSTAT
-# define NO_SIZE_CHECK
+# define NO_CHOWN
+# define NO_STDIN_FSTAT
+# define NO_SIZE_CHECK
# define NO_SYMLINK
# define RECORD_IO 1
-# define casemap(c) tolow(c) /* Force file names to lower case */
+# define casemap(c) tolow(c) /* Force file names to lower case */
# define put_char(c) put_byte((c) & 0x7F)
# define get_char(c) ascii2pascii(get_byte())
-# define OS_CODE 0x0F /* temporary, subject to change */
+# define OS_CODE 0x0F /* temporary, subject to change */
# ifdef SIGTERM
-# undef SIGTERM /* We don't want a signal handler for SIGTERM */
+# undef SIGTERM /* We don't want a signal handler for SIGTERM */
# endif
#endif
-#if defined(pyr) && !defined(NOMEMCPY) /* Pyramid */
-# define NOMEMCPY /* problem with overlapping copies */
+#if defined(pyr) && !defined(NOMEMCPY) /* Pyramid */
+# define NOMEMCPY /* problem with overlapping copies */
#endif
#ifdef TOPS20
#endif
#ifndef unix
-# define NO_ST_INO /* don't rely on inode numbers */
+# define NO_ST_INO /* don't rely on inode numbers */
#endif
/* Common defaults */
#ifndef OS_CODE
-# define OS_CODE 0x03 /* assume Unix */
+# define OS_CODE 0x03 /* assume Unix */
#endif
#ifndef PATH_SEP
# include <stdio.h>
#endif
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
/* ===========================================================================
* Local data used by the "bit string" routines.
*/
-local file_t zfile; /* output gzip file */
+local file_t zfile; /* output gzip file */
local unsigned short bi_buf;
+
/* Output buffer. bits are inserted starting at the bottom (least significant
* bits).
*/
*/
local int bi_valid;
+
/* Number of valid bits in bi_buf. All bits above the last valid bit
* are always zero.
*/
-int (*read_buf) OF((char *buf, unsigned size));
+int (*read_buf) (char *buf, unsigned size);
+
/* Current input function. Set to mem_read for in-memory compression */
#ifdef DEBUG
- ulg bits_sent; /* bit length of the compressed data */
+ulg bits_sent; /* bit length of the compressed data */
#endif
/* ===========================================================================
* Initialize the bit string routines.
*/
-void bi_init (zipfile)
- file_t zipfile; /* output zip file, NO_FILE for in-memory compression */
+void bi_init(zipfile)
+file_t zipfile; /* output zip file, NO_FILE for in-memory compression */
{
- zfile = zipfile;
- bi_buf = 0;
- bi_valid = 0;
+ zfile = zipfile;
+ bi_buf = 0;
+ bi_valid = 0;
#ifdef DEBUG
- bits_sent = 0L;
+ bits_sent = 0L;
#endif
- /* Set the defaults for file compression. They are set by memcompress
- * for in-memory compression.
- */
- if (zfile != NO_FILE) {
- read_buf = file_read;
- }
+ /* Set the defaults for file compression. They are set by memcompress
+ * for in-memory compression.
+ */
+ if (zfile != NO_FILE) {
+ read_buf = file_read;
+ }
}
/* ===========================================================================
* IN assertion: length <= 16 and value fits in length bits.
*/
void send_bits(value, length)
- int value; /* value to send */
- int length; /* number of bits */
+int value; /* value to send */
+int length; /* number of bits */
{
#ifdef DEBUG
- Tracev((stderr," l %2d v %4x ", length, value));
- Assert(length > 0 && length <= 15, "invalid length");
- bits_sent += (ulg)length;
-#endif
- /* If not enough room in bi_buf, use (valid) bits from bi_buf and
- * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
- * unused bits in value.
- */
- if (bi_valid > (int)Buf_size - length) {
- bi_buf |= (value << bi_valid);
- put_short(bi_buf);
- bi_buf = (ush)value >> (Buf_size - bi_valid);
- bi_valid += length - Buf_size;
- } else {
- bi_buf |= value << bi_valid;
- bi_valid += length;
- }
+ Tracev((stderr, " l %2d v %4x ", length, value));
+ Assert(length > 0 && length <= 15, "invalid length");
+ bits_sent += (ulg) length;
+#endif
+ /* If not enough room in bi_buf, use (valid) bits from bi_buf and
+ * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
+ * unused bits in value.
+ */
+ if (bi_valid > (int) Buf_size - length) {
+ bi_buf |= (value << bi_valid);
+ put_short(bi_buf);
+ bi_buf = (ush) value >> (Buf_size - bi_valid);
+ bi_valid += length - Buf_size;
+ } else {
+ bi_buf |= value << bi_valid;
+ bi_valid += length;
+ }
}
/* ===========================================================================
* IN assertion: 1 <= len <= 15
*/
unsigned bi_reverse(code, len)
- unsigned code; /* the value to invert */
- int len; /* its bit length */
+unsigned code; /* the value to invert */
+int len; /* its bit length */
{
- register unsigned res = 0;
- do {
- res |= code & 1;
- code >>= 1, res <<= 1;
- } while (--len > 0);
- return res >> 1;
+ register unsigned res = 0;
+
+ do {
+ res |= code & 1;
+ code >>= 1, res <<= 1;
+ } while (--len > 0);
+ return res >> 1;
}
/* ===========================================================================
*/
void bi_windup()
{
- if (bi_valid > 8) {
- put_short(bi_buf);
- } else if (bi_valid > 0) {
- put_byte(bi_buf);
- }
- bi_buf = 0;
- bi_valid = 0;
+ if (bi_valid > 8) {
+ put_short(bi_buf);
+ } else if (bi_valid > 0) {
+ put_byte(bi_buf);
+ }
+ bi_buf = 0;
+ bi_valid = 0;
#ifdef DEBUG
- bits_sent = (bits_sent+7) & ~7;
+ bits_sent = (bits_sent + 7) & ~7;
#endif
}
* one's complement if requested.
*/
void copy_block(buf, len, header)
- char *buf; /* the input data */
- unsigned len; /* its length */
- int header; /* true if block header must be written */
+char *buf; /* the input data */
+unsigned len; /* its length */
+int header; /* true if block header must be written */
{
- bi_windup(); /* align on byte boundary */
+ bi_windup(); /* align on byte boundary */
- if (header) {
- put_short((ush)len);
- put_short((ush)~len);
+ if (header) {
+ put_short((ush) len);
+ put_short((ush) ~ len);
#ifdef DEBUG
- bits_sent += 2*16;
+ bits_sent += 2 * 16;
#endif
- }
+ }
#ifdef DEBUG
- bits_sent += (ulg)len<<3;
+ bits_sent += (ulg) len << 3;
#endif
- while (len--) {
+ while (len--) {
#ifdef CRYPT
- int t;
- if (key) zencode(*buf, t);
+ int t;
+
+ if (key)
+ zencode(*buf, t);
#endif
- put_byte(*buf++);
- }
+ put_byte(*buf++);
+ }
}
+
/* deflate.c -- compress data using the deflation algorithm
* Copyright (C) 1992-1993 Jean-loup Gailly
* This is free software; you can redistribute it and/or modify it under the
#include <stdio.h>
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
/* ===========================================================================
* Configuration parameters
*/
*/
#ifdef SMALL_MEM
-# define HASH_BITS 13 /* Number of bits used to hash strings */
+# define HASH_BITS 13 /* Number of bits used to hash strings */
#endif
#ifdef MEDIUM_MEM
# define HASH_BITS 14
* window with tab_suffix. Check that we can do this:
*/
#if (WSIZE<<1) > (1<<BITS)
- error: cannot overlay window with tab_suffix and prev with tab_prefix0
+error:cannot overlay window with tab_suffix and prev with tab_prefix0
#endif
#if HASH_BITS > BITS-1
- error: cannot overlay head with tab_prefix1
+error:cannot overlay head with tab_prefix1
#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 */
-
/* ===========================================================================
* Local data used by the "longest match" routines.
*/
-
typedef ush Pos;
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.
*/
/* DECLARE(Pos, head, 1<<HASH_BITS); */
/* Heads of the hash chains or NIL. */
-ulg window_size = (ulg)2*WSIZE;
+ulg window_size = (ulg) 2 * WSIZE;
+
/* 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 unsigned ins_h; /* hash index of string to be inserted */
+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
*/
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 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.
*/
unsigned near good_match;
+
/* Use a faster search when the previous match is longer than this */
*/
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;
+ 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;
#ifdef FULL_SEARCH
# define nice_match MAX_MATCH
#else
- int near nice_match; /* Stop searching when current match exceeds this */
+int near nice_match; /* Stop searching when current match exceeds this */
#endif
-local config configuration_table =
-/* 9 */ {32, 258, 258, 4096}; /* maximum compression */
+local config configuration_table =
+ /* 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
/* ===========================================================================
* Prototypes for local functions.
*/
-local void fill_window OF((void));
+local void fill_window (void);
+
+int longest_match (IPos cur_match);
- int longest_match OF((IPos cur_match));
#ifdef ASMV
- void match_init OF((void)); /* asm code initialization */
+void match_init (void); /* asm code initialization */
#endif
#ifdef DEBUG
-local void check_match OF((IPos start, IPos match, int length));
+local void check_match (IPos start, IPos match, int length);
#endif
/* ===========================================================================
/* ===========================================================================
* Initialize the "longest match" routines for a new file
*/
-void lm_init (flags)
- ush *flags; /* general purpose bit flag */
+void lm_init(flags)
+ush *flags; /* general purpose bit flag */
{
- register unsigned j;
+ register unsigned j;
- /* Initialize the hash table. */
+ /* Initialize the hash table. */
#if defined(MAXSEG_64K) && HASH_BITS == 15
- for (j = 0; j < HASH_SIZE; j++) head[j] = NIL;
+ for (j = 0; j < HASH_SIZE; j++)
+ head[j] = NIL;
#else
- memzero((char*)head, HASH_SIZE*sizeof(*head));
+ memzero((char *) head, HASH_SIZE * sizeof(*head));
#endif
- /* prev will be initialized on the fly */
+ /* prev will be initialized on the fly */
- /* Set the default configuration parameters:
- */
- max_lazy_match = configuration_table.max_lazy;
- good_match = configuration_table.good_length;
+ /* Set the default configuration parameters:
+ */
+ max_lazy_match = configuration_table.max_lazy;
+ good_match = configuration_table.good_length;
#ifndef FULL_SEARCH
- nice_match = configuration_table.nice_length;
+ nice_match = configuration_table.nice_length;
#endif
- max_chain_length = configuration_table.max_chain;
- *flags |= SLOW;
- /* ??? reduce max_chain_length for binary files */
+ max_chain_length = configuration_table.max_chain;
+ *flags |= SLOW;
+ /* ??? reduce max_chain_length for binary files */
- strstart = 0;
- block_start = 0L;
+ strstart = 0;
+ block_start = 0L;
#ifdef ASMV
- match_init(); /* initialize the asm code */
-#endif
-
- lookahead = read_buf((char*)window,
- sizeof(int) <= 2 ? (unsigned)WSIZE : 2*WSIZE);
-
- 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.
- */
- while (lookahead < MIN_LOOKAHEAD && !eofile) 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.
- */
+ match_init(); /* initialize the asm code */
+#endif
+
+ lookahead = read_buf((char *) window,
+ sizeof(int) <= 2 ? (unsigned) WSIZE : 2 * WSIZE);
+
+ 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.
+ */
+ while (lookahead < MIN_LOOKAHEAD && !eofile)
+ 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.
+ */
}
/* ===========================================================================
* if desired.
*/
int longest_match(cur_match)
- IPos cur_match; /* current match */
+IPos cur_match; /* current match */
{
- unsigned chain_length = max_chain_length; /* max hash chain length */
- register uch *scan = window + strstart; /* current string */
- register uch *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.
- */
+ unsigned chain_length = max_chain_length; /* max hash chain length */
+ register uch *scan = window + strstart; /* current string */
+ register uch *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
+ 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 *strend = window + strstart + MAX_MATCH - 1;
- register ush scan_start = *(ush*)scan;
- register ush scan_end = *(ush*)(scan+best_len-1);
+ /* Compare two bytes at a time. Note: this is not always beneficial.
+ * Try with and without -DUNALIGNED_OK to check.
+ */
+ register uch *strend = window + strstart + MAX_MATCH - 1;
+ register ush scan_start = *(ush *) scan;
+ register ush scan_end = *(ush *) (scan + best_len - 1);
#else
- register uch *strend = window + strstart + MAX_MATCH;
- register uch scan_end1 = scan[best_len-1];
- register uch scan_end = scan[best_len];
+ register uch *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 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;
+ 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:
- */
+ /* 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*)(match+best_len-1) != scan_end ||
- *(ush*)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*)(scan+=2) == *(ush*)(match+=2) &&
- *(ush*)(scan+=2) == *(ush*)(match+=2) &&
- *(ush*)(scan+=2) == *(ush*)(match+=2) &&
- *(ush*)(scan+=2) == *(ush*)(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);
-
- 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;
+ /* This code assumes sizeof(unsigned short) == 2. Do not use
+ * UNALIGNED_OK if your compiler uses a different size.
+ */
+ if (*(ush *) (match + best_len - 1) != scan_end ||
+ *(ush *) 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 *) (scan += 2) == *(ush *) (match += 2) &&
+ *(ush *) (scan += 2) == *(ush *) (match += 2) &&
+ *(ush *) (scan += 2) == *(ush *) (match += 2) &&
+ *(ush *) (scan += 2) == *(ush *) (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);
+
+ 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*)(scan+best_len-1);
+ scan_end = *(ush *) (scan + best_len - 1);
#else
- scan_end1 = scan[best_len-1];
- scan_end = scan[best_len];
+ scan_end1 = scan[best_len - 1];
+ scan_end = scan[best_len];
#endif
- }
- } while ((cur_match = prev[cur_match & WMASK]) > limit
- && --chain_length != 0);
+ }
+ } while ((cur_match = prev[cur_match & WMASK]) > limit
+ && --chain_length != 0);
- return best_len;
+ return best_len;
}
-#endif /* ASMV */
+#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;
+IPos start, match;
+int length;
{
- /* check that the match is indeed a match */
- if (memcmp((char*)window + match,
- (char*)window + start, length) != EQUAL) {
- fprintf(stderr,
- " start %d, match %d, length %d\n",
- start, match, length);
- error("invalid match");
- }
- if (verbose > 1) {
- fprintf(stderr,"\\[%d,%d]", start-match, length);
- do { putc(window[start++], stderr); } while (--length != 0);
- }
+ /* check that the match is indeed a match */
+ if (memcmp((char *) window + match,
+ (char *) window + start, length) != EQUAL) {
+ fprintf(stderr,
+ " start %d, match %d, length %d\n", start, match, length);
+ errorMsg("invalid match\n");
+ }
+ if (verbose > 1) {
+ fprintf(stderr, "\\[%d,%d]", start - match, length);
+ do {
+ putc(window[start++], stderr);
+ } while (--length != 0);
+ }
}
#else
# define check_match(start, match, length)
*/
local void fill_window()
{
- register unsigned n, m;
- unsigned more = (unsigned)(window_size - (ulg)lookahead - (ulg)strstart);
- /* Amount of free space at the end of the window. */
-
- /* 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--;
- } else if (strstart >= WSIZE+MAX_DIST) {
- /* By the IN assertion, the window is not empty so we can't confuse
- * more == 0 with more == 64K on a 16 bit machine.
- */
- Assert(window_size == (ulg)2*WSIZE, "no sliding with BIG_MEM");
-
- 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;
- }
- /* At this point, more >= 2 */
- if (!eofile) {
- n = read_buf((char*)window+strstart+lookahead, more);
- if (n == 0 || n == (unsigned)EOF) {
- eofile = 1;
- } else {
- lookahead += n;
- }
- }
+ register unsigned n, m;
+ unsigned more =
+
+ (unsigned) (window_size - (ulg) lookahead - (ulg) strstart);
+ /* Amount of free space at the end of the window. */
+
+ /* 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--;
+ } else if (strstart >= WSIZE + MAX_DIST) {
+ /* By the IN assertion, the window is not empty so we can't confuse
+ * more == 0 with more == 64K on a 16 bit machine.
+ */
+ Assert(window_size == (ulg) 2 * WSIZE, "no sliding with BIG_MEM");
+
+ 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;
+ }
+ /* At this point, more >= 2 */
+ if (!eofile) {
+ n = read_buf((char *) window + strstart + lookahead, more);
+ if (n == 0 || n == (unsigned) EOF) {
+ eofile = 1;
+ } else {
+ lookahead += n;
+ }
+ }
}
/* ===========================================================================
*/
ulg deflate()
{
- IPos hash_head; /* 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 */
+ IPos hash_head; /* 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 long isize; /* byte length of input file, for debug only */
-#endif
-
- /* 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:
- */
- 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).
- */
- match_length = longest_match (hash_head);
- /* longest_match() sets match_start */
- if (match_length > lookahead) match_length = lookahead;
-
- /* Ignore a length 3 match if it is too distant: */
- if (match_length == MIN_MATCH && strstart-match_start > TOO_FAR){
- /* If prev_match is also MIN_MATCH, match_start is garbage
- * but we will ignore the current match anyway.
- */
- match_length--;
- }
- }
- /* 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) {
-
- 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;
- 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);
- match_available = 0;
- match_length = MIN_MATCH-1;
- strstart++;
- 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.
- */
- while (lookahead < MIN_LOOKAHEAD && !eofile) fill_window();
- }
- if (match_available) ct_tally (0, window[strstart-1]);
-
- return FLUSH_BLOCK(1); /* eof */
+ extern long isize; /* byte length of input file, for debug only */
+#endif
+
+ /* 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:
+ */
+ 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).
+ */
+ match_length = longest_match(hash_head);
+ /* longest_match() sets match_start */
+ if (match_length > lookahead)
+ match_length = lookahead;
+
+ /* Ignore a length 3 match if it is too distant: */
+ if (match_length == MIN_MATCH
+ && strstart - match_start > TOO_FAR) {
+ /* If prev_match is also MIN_MATCH, match_start is garbage
+ * but we will ignore the current match anyway.
+ */
+ match_length--;
+ }
+ }
+ /* 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) {
+
+ 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;
+ 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);
+ match_available = 0;
+ match_length = MIN_MATCH - 1;
+ strstart++;
+ 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.
+ */
+ while (lookahead < MIN_LOOKAHEAD && !eofile)
+ fill_window();
+ }
+ if (match_available)
+ ct_tally(0, window[strstart - 1]);
+
+ return FLUSH_BLOCK(1); /* eof */
}
+
/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
* Copyright (C) 1992-1993 Jean-loup Gailly
* The unzip code was written and put in the public domain by Mark Adler.
* For the meaning of all compilation flags, see comments in Makefile.in.
*/
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
-#include <sys/stat.h>
#include <errno.h>
/* configuration */
#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
# include <stdlib.h>
#else
- extern int errno;
+extern int errno;
#endif
#if defined(DIRENT)
# include <dirent.h>
- typedef struct dirent dir_type;
+typedef struct dirent dir_type;
+
# define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
# define DIR_OPT "DIRENT"
#else
# define NLENGTH(dirent) ((dirent)->d_namlen)
# ifdef SYSDIR
# include <sys/dir.h>
- typedef struct direct dir_type;
+typedef struct direct dir_type;
+
# define DIR_OPT "SYSDIR"
# else
# ifdef SYSNDIR
# include <sys/ndir.h>
- typedef struct direct dir_type;
+typedef struct direct dir_type;
+
# define DIR_OPT "SYSNDIR"
# else
# ifdef NDIR
# include <ndir.h>
- typedef struct direct dir_type;
+typedef struct direct dir_type;
+
# define DIR_OPT "NDIR"
# else
# define NO_DIR
# include <sys/utime.h>
# define TIME_OPT "SYS_UTIME"
# else
- struct utimbuf {
- time_t actime;
- time_t modtime;
- };
+struct utimbuf {
+ time_t actime;
+ time_t modtime;
+};
+
# define TIME_OPT ""
# endif
# endif
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
-typedef RETSIGTYPE (*sig_type) OF((int));
+typedef RETSIGTYPE(*sig_type) (int);
#ifndef O_BINARY
-# define O_BINARY 0 /* creation mode for open() */
+# define O_BINARY 0 /* creation mode for open() */
#endif
#ifndef O_CREAT
#ifndef S_IWUSR
# define S_IWUSR 0200
#endif
-#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
+#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
#ifndef MAX_PATH_LEN
-# define MAX_PATH_LEN 1024 /* max pathname length */
+# define MAX_PATH_LEN 1024 /* max pathname length */
#endif
#ifndef SEEK_END
#endif
#ifdef NO_OFF_T
- typedef long off_t;
- off_t lseek OF((int fd, off_t offset, int whence));
+typedef long off_t;
+off_t lseek (int fd, off_t offset, int whence);
#endif
/* Separator for file name parts (see shorten_name()) */
/* global buffers */
-DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
-DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
-DECLARE(ush, d_buf, DIST_BUFSIZE);
-DECLARE(uch, window, 2L*WSIZE);
+DECLARE(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
+DECLARE(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
+DECLARE(ush, d_buf, DIST_BUFSIZE);
+DECLARE(uch, window, 2L * WSIZE);
#ifndef MAXSEG_64K
- DECLARE(ush, tab_prefix, 1L<<BITS);
+DECLARE(ush, tab_prefix, 1L << BITS);
#else
- DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
- DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
+DECLARE(ush, tab_prefix0, 1L << (BITS - 1));
+DECLARE(ush, tab_prefix1, 1L << (BITS - 1));
#endif
/* local variables */
-int ascii = 0; /* convert end-of-lines to local OS conventions */
-int to_stdout = 0; /* output to stdout (-c) */
-int decompress = 0; /* decompress (-d) */
-int no_name = -1; /* don't save or restore the original file name */
-int no_time = -1; /* don't save or restore the original file time */
-int foreground; /* set if program run in foreground */
-char *progname; /* program name */
-static int method = DEFLATED;/* compression method */
-static int exit_code = OK; /* program exit code */
-int save_orig_name; /* set if original name must be saved */
-int last_member; /* set for .zip and .Z files */
-int part_nb; /* number of parts in .gz file */
-long time_stamp; /* original time stamp (modification time) */
-long ifile_size; /* input file size, -1 for devices (debug only) */
-char *env; /* contents of GZIP env variable */
-char **args = NULL; /* argv pointer if GZIP env variable defined */
-char z_suffix[MAX_SUFFIX+1]; /* default suffix (can be set with --suffix) */
-int z_len; /* strlen(z_suffix) */
-
-long bytes_in; /* number of input bytes */
-long bytes_out; /* number of output bytes */
-char ifname[MAX_PATH_LEN]; /* input file name */
-char ofname[MAX_PATH_LEN]; /* output file name */
-int remove_ofname = 0; /* remove output file on error */
-struct stat istat; /* status for input file */
-int ifd; /* input file descriptor */
-int ofd; /* output file descriptor */
-unsigned insize; /* valid bytes in inbuf */
-unsigned inptr; /* index of next byte to be processed in inbuf */
-unsigned outcnt; /* bytes in output buffer */
+static int foreground; /* set if program run in foreground */
+static int method = DEFLATED; /* compression method */
+static int exit_code = OK; /* program exit code */
+static int part_nb; /* number of parts in .gz file */
+static long time_stamp; /* original time stamp (modification time) */
+static long ifile_size; /* input file size, -1 for devices (debug only) */
+static char z_suffix[MAX_SUFFIX + 1]; /* default suffix (can be set with --suffix) */
+static int z_len; /* strlen(z_suffix) */
+
+static long bytes_in; /* number of input bytes */
+static long bytes_out; /* number of output bytes */
+static char ifname[MAX_PATH_LEN]; /* input file name */
+static char ofname[MAX_PATH_LEN]; /* output file name */
+static int ifd; /* input file descriptor */
+static int ofd; /* output file descriptor */
+static unsigned insize; /* valid bytes in inbuf */
+static unsigned outcnt; /* bytes in output buffer */
/* local functions */
-local void treat_stdin OF((void));
-static int (*work) OF((int infile, int outfile)) = zip; /* function to call */
-
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
/* ======================================================================== */
// int main (argc, argv)
// int argc;
// char **argv;
-int gzip_main(int argc, char * * argv)
+int gzip_main(int argc, char **argv)
{
- foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
- if (foreground) {
- (void) signal (SIGINT, (sig_type)abort_gzip);
- }
+ int result;
+ int inFileNum;
+ int outFileNum;
+ struct stat statBuf;
+ char *delFileName;
+ int tostdout = 0;
+ int fromstdin = 0;
+ int force = 0;
+
+ /* Parse any options */
+ while (--argc > 0 && **(++argv) == '-') {
+ if (*((*argv) + 1) == '\0') {
+ tostdout = 1;
+ }
+ while (*(++(*argv))) {
+ switch (**argv) {
+ case 'c':
+ tostdout = 1;
+ break;
+ case 'f':
+ force = 1;
+ break;
+ /* Ignore 1-9 (compression level) options */
+ case '1': case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9':
+ break;
+ default:
+ usage(gzip_usage);
+ }
+ }
+ }
+ if (argc <= 0 ) {
+ fromstdin = 1;
+ tostdout = 1;
+ }
+
+ if (isatty(fileno(stdin)) && fromstdin==1 && force==0)
+ fatalError( "data not read from terminal. Use -f to force it.\n");
+ if (isatty(fileno(stdout)) && tostdout==1 && force==0)
+ fatalError( "data not written to terminal. Use -f to force it.\n");
+
+ foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
+ if (foreground) {
+ (void) signal(SIGINT, (sig_type) abort_gzip);
+ }
#ifdef SIGTERM
- if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
- (void) signal(SIGTERM, (sig_type)abort_gzip);
- }
+ if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
+ (void) signal(SIGTERM, (sig_type) abort_gzip);
+ }
#endif
#ifdef SIGHUP
- if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
- (void) signal(SIGHUP, (sig_type)abort_gzip);
- }
+ if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
+ (void) signal(SIGHUP, (sig_type) abort_gzip);
+ }
#endif
- strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix)-1);
- z_len = strlen(z_suffix);
-
- to_stdout = 1;
+ strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix) - 1);
+ z_len = strlen(z_suffix);
- /* Allocate all global buffers (for DYN_ALLOC option) */
- ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
- ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
- ALLOC(ush, d_buf, DIST_BUFSIZE);
- ALLOC(uch, window, 2L*WSIZE);
+ /* Allocate all global buffers (for DYN_ALLOC option) */
+ ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
+ ALLOC(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
+ ALLOC(ush, d_buf, DIST_BUFSIZE);
+ ALLOC(uch, window, 2L * WSIZE);
#ifndef MAXSEG_64K
- ALLOC(ush, tab_prefix, 1L<<BITS);
+ ALLOC(ush, tab_prefix, 1L << BITS);
#else
- ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
- ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
-#endif
+ ALLOC(ush, tab_prefix0, 1L << (BITS - 1));
+ ALLOC(ush, tab_prefix1, 1L << (BITS - 1));
+#endif
+
+ if (fromstdin == 1) {
+ strcpy(ofname, "stdin");
+
+ inFileNum = fileno(stdin);
+ time_stamp = 0; /* time unknown by default */
+ ifile_size = -1L; /* convention for unknown size */
+ } else {
+ /* Open up the input file */
+ if (argc <= 0)
+ usage(gzip_usage);
+ strncpy(ifname, *argv, MAX_PATH_LEN);
+
+ /* Open input fille */
+ inFileNum = open(ifname, O_RDONLY);
+ if (inFileNum < 0) {
+ perror(ifname);
+ exit(WARNING);
+ }
+ /* Get the time stamp on the input file. */
+ result = stat(ifname, &statBuf);
+ if (result < 0) {
+ perror(ifname);
+ exit(WARNING);
+ }
+ time_stamp = statBuf.st_ctime;
+ ifile_size = statBuf.st_size;
+ }
- /* And get to work */
- treat_stdin();
- do_exit(exit_code);
- return exit_code; /* just to avoid lint warning */
-}
-/* ========================================================================
- * Compress or decompress stdin
- */
-local void treat_stdin()
-{
- SET_BINARY_MODE(fileno(stdout));
- strcpy(ifname, "stdin");
- strcpy(ofname, "stdout");
+ if (tostdout == 1) {
+ /* And get to work */
+ strcpy(ofname, "stdout");
+ outFileNum = fileno(stdout);
+ SET_BINARY_MODE(fileno(stdout));
- /* Get the time stamp on the input file. */
- time_stamp = 0; /* time unknown by default */
+ clear_bufs(); /* clear input and output buffers */
+ part_nb = 0;
- ifile_size = -1L; /* convention for unknown size */
+ /* Actually do the compression/decompression. */
+ zip(inFileNum, outFileNum);
- clear_bufs(); /* clear input and output buffers */
- to_stdout = 1;
- part_nb = 0;
+ } else {
- /* Actually do the compression/decompression. Loop over zipped members.
- */
- if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
-}
+ /* And get to work */
+ strncpy(ofname, ifname, MAX_PATH_LEN - 4);
+ strcat(ofname, ".gz");
-/* ========================================================================
- * Free all dynamically allocated variables and exit with the given code.
- */
-local void do_exit(int exitcode)
-{
- static int in_exit = 0;
-
- if (in_exit) exit(exitcode);
- in_exit = 1;
- if (env != NULL) free(env), env = NULL;
- if (args != NULL) free((char*)args), args = NULL;
- FREE(inbuf);
- FREE(outbuf);
- FREE(d_buf);
- FREE(window);
-#ifndef MAXSEG_64K
- FREE(tab_prefix);
+
+ /* Open output fille */
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+ outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
#else
- FREE(tab_prefix0);
- FREE(tab_prefix1);
-#endif
- exit(exitcode);
+ outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL);
+#endif
+ if (outFileNum < 0) {
+ perror(ofname);
+ exit(WARNING);
+ }
+ SET_BINARY_MODE(outFileNum);
+ /* Set permissions on the file */
+ fchmod(outFileNum, statBuf.st_mode);
+
+ clear_bufs(); /* clear input and output buffers */
+ part_nb = 0;
+
+ /* Actually do the compression/decompression. */
+ result = zip(inFileNum, outFileNum);
+ close(outFileNum);
+ close(inFileNum);
+ /* Delete the original file */
+ if (result == OK)
+ delFileName = ifname;
+ else
+ delFileName = ofname;
+
+ if (unlink(delFileName) < 0) {
+ perror(delFileName);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ return(exit_code);
}
+
/* trees.c -- output deflated data using Huffman coding
* Copyright (C) 1992-1993 Jean-loup Gailly
* This is free software; you can redistribute it and/or modify it under the
#include <ctype.h>
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
/* ===========================================================================
* Constants
*/
/* number of codes used to transfer the bit lengths */
-local int near extra_lbits[LENGTH_CODES] /* extra bits for each length code */
- = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
+local int near extra_lbits[LENGTH_CODES] /* extra bits for each length code */
+ = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4,
+ 4, 4, 5, 5, 5, 5, 0 };
-local int near extra_dbits[D_CODES] /* extra bits for each distance code */
- = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+local int near extra_dbits[D_CODES] /* extra bits for each distance code */
+ = { 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
+ 10, 10, 11, 11, 12, 12, 13, 13 };
-local int near extra_blbits[BL_CODES]/* extra bits for each bit length code */
- = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
+local int near extra_blbits[BL_CODES] /* extra bits for each bit length code */
+= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7 };
#define STORED_BLOCK 0
#define STATIC_TREES 1
* if we rely on DIST_BUFSIZE == LIT_BUFSIZE.
*/
#if LIT_BUFSIZE > INBUFSIZ
- error cannot overlay l_buf and inbuf
+error cannot overlay l_buf and inbuf
#endif
-
#define REP_3_6 16
/* repeat previous bit length 3-6 times (2 bits of repeat count) */
-
#define REPZ_3_10 17
/* repeat a zero length 3-10 times (3 bits of repeat count) */
-
#define REPZ_11_138 18
-/* repeat a zero length 11-138 times (7 bits of repeat count) */
-
-/* ===========================================================================
+/* repeat a zero length 11-138 times (7 bits of repeat count) *//* ===========================================================================
* Local data
- */
-
-/* Data structure describing a single value and its code string. */
-typedef struct ct_data {
- union {
- ush freq; /* frequency count */
- ush code; /* bit string */
- } fc;
- union {
- ush dad; /* father node in Huffman tree */
- ush len; /* length of bit string */
- } dl;
+ *//* Data structure describing a single value and its code string. */ typedef struct ct_data {
+ union {
+ ush freq; /* frequency count */
+ ush code; /* bit string */
+ } fc;
+ union {
+ ush dad; /* father node in Huffman tree */
+ ush len; /* length of bit string */
+ } dl;
} ct_data;
#define Freq fc.freq
#define HEAP_SIZE (2*L_CODES+1)
/* maximum heap size */
-local ct_data near dyn_ltree[HEAP_SIZE]; /* literal and length tree */
-local ct_data near dyn_dtree[2*D_CODES+1]; /* distance tree */
+local ct_data near dyn_ltree[HEAP_SIZE]; /* literal and length tree */
+local ct_data near dyn_dtree[2 * D_CODES + 1]; /* distance tree */
+
+local ct_data near static_ltree[L_CODES + 2];
-local ct_data near static_ltree[L_CODES+2];
/* The static literal tree. Since the bit lengths are imposed, there is no
* need for the L_CODES extra codes used during heap construction. However
* The codes 286 and 287 are needed to build a canonical tree (see ct_init
*/
local ct_data near static_dtree[D_CODES];
+
/* The static distance tree. (Actually a trivial tree since all codes use
* 5 bits.)
*/
-local ct_data near bl_tree[2*BL_CODES+1];
+local ct_data near bl_tree[2 * BL_CODES + 1];
+
/* Huffman tree for the bit lengths */
typedef struct tree_desc {
- ct_data near *dyn_tree; /* the dynamic tree */
- ct_data near *static_tree; /* corresponding static tree or NULL */
- int near *extra_bits; /* extra bits for each code or NULL */
- int extra_base; /* base index for extra_bits */
- int elems; /* max number of elements in the tree */
- int max_length; /* max bit length for the codes */
- int max_code; /* largest code with non zero frequency */
+ ct_data near *dyn_tree; /* the dynamic tree */
+ ct_data near *static_tree; /* corresponding static tree or NULL */
+ int near *extra_bits; /* extra bits for each code or NULL */
+ int extra_base; /* base index for extra_bits */
+ int elems; /* max number of elements in the tree */
+ int max_length; /* max bit length for the codes */
+ int max_code; /* largest code with non zero frequency */
} tree_desc;
local tree_desc near l_desc =
-{dyn_ltree, static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS, 0};
+ { dyn_ltree, static_ltree, extra_lbits, LITERALS + 1, L_CODES,
+ MAX_BITS, 0 };
local tree_desc near d_desc =
-{dyn_dtree, static_dtree, extra_dbits, 0, D_CODES, MAX_BITS, 0};
+ { dyn_dtree, static_dtree, extra_dbits, 0, D_CODES, MAX_BITS, 0 };
local tree_desc near bl_desc =
-{bl_tree, (ct_data near *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS, 0};
+ { bl_tree, (ct_data near *) 0, extra_blbits, 0, BL_CODES, MAX_BL_BITS,
+ 0 };
-local ush near bl_count[MAX_BITS+1];
+local ush near bl_count[MAX_BITS + 1];
+
/* number of codes at each bit length for an optimal tree */
local uch near bl_order[BL_CODES]
- = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
+= { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 };
+
/* The lengths of the bit length codes are sent in order of decreasing
* probability, to avoid transmitting the lengths for unused bit length codes.
*/
-local int near heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
-local int heap_len; /* number of elements in the heap */
-local int heap_max; /* element of largest frequency */
+local int near heap[2 * L_CODES + 1]; /* heap used to build the Huffman trees */
+local int heap_len; /* number of elements in the heap */
+local int heap_max; /* element of largest frequency */
+
/* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
* The same heap array is used to build all trees.
*/
-local uch near depth[2*L_CODES+1];
+local uch near depth[2 * L_CODES + 1];
+
/* Depth of each subtree used as tie breaker for trees of equal frequency */
-local uch length_code[MAX_MATCH-MIN_MATCH+1];
+local uch length_code[MAX_MATCH - MIN_MATCH + 1];
+
/* length code for each normalized match length (0 == MIN_MATCH) */
local uch dist_code[512];
+
/* distance codes. The first 256 values correspond to the distances
* 3 .. 258, the last 256 values correspond to the top 8 bits of
* the 15 bit distances.
*/
local int near base_length[LENGTH_CODES];
+
/* First normalized length for each code (0 = MIN_MATCH) */
local int near base_dist[D_CODES];
+
/* First normalized distance for each code (0 = distance of 1) */
#define l_buf inbuf
/* DECLARE(ush, d_buf, DIST_BUFSIZE); buffer for distances */
-local uch near flag_buf[(LIT_BUFSIZE/8)];
+local uch near flag_buf[(LIT_BUFSIZE / 8)];
+
/* flag_buf is a bit array distinguishing literals from lengths in
* l_buf, thus indicating the presence or absence of a distance.
*/
-local unsigned last_lit; /* running index in l_buf */
-local unsigned last_dist; /* running index in d_buf */
-local unsigned last_flags; /* running index in flag_buf */
-local uch flags; /* current flags not yet saved in flag_buf */
-local uch flag_bit; /* current bit used in flags */
+local unsigned last_lit; /* running index in l_buf */
+local unsigned last_dist; /* running index in d_buf */
+local unsigned last_flags; /* running index in flag_buf */
+local uch flags; /* current flags not yet saved in flag_buf */
+local uch flag_bit; /* current bit used in flags */
+
/* bits are filled in flags starting at bit 0 (least significant).
* Note: these flags are overkill in the current code since we don't
* take advantage of DIST_BUFSIZE == LIT_BUFSIZE.
*/
-local ulg opt_len; /* bit length of current block with optimal trees */
-local ulg static_len; /* bit length of current block with static trees */
+local ulg opt_len; /* bit length of current block with optimal trees */
+local ulg static_len; /* bit length of current block with static trees */
+
+local ulg compressed_len; /* total bit length of compressed file */
-local ulg compressed_len; /* total bit length of compressed file */
+local ulg input_len; /* total byte length of input file */
-local ulg input_len; /* total byte length of input file */
/* input_len is for debugging only since we can get it by other means. */
-ush *file_type; /* pointer to UNKNOWN, BINARY or ASCII */
-int *file_method; /* pointer to DEFLATE or STORE */
+ush *file_type; /* pointer to UNKNOWN, BINARY or ASCII */
+int *file_method; /* pointer to DEFLATE or STORE */
#ifdef DEBUG
-extern ulg bits_sent; /* bit length of the compressed data */
-extern long isize; /* byte length of input file */
+extern ulg bits_sent; /* bit length of the compressed data */
+extern long isize; /* byte length of input file */
#endif
-extern long block_start; /* window offset of current block */
-extern unsigned near strstart; /* window offset of current string */
+extern long block_start; /* window offset of current block */
+extern unsigned near strstart; /* window offset of current string */
/* ===========================================================================
* Local (static) routines in this file.
*/
-local void init_block OF((void));
-local void pqdownheap OF((ct_data near *tree, int k));
-local void gen_bitlen OF((tree_desc near *desc));
-local void gen_codes OF((ct_data near *tree, int max_code));
-local void build_tree OF((tree_desc near *desc));
-local void scan_tree OF((ct_data near *tree, int max_code));
-local void send_tree OF((ct_data near *tree, int max_code));
-local int build_bl_tree OF((void));
-local void send_all_trees OF((int lcodes, int dcodes, int blcodes));
-local void compress_block OF((ct_data near *ltree, ct_data near *dtree));
-local void set_file_type OF((void));
+local void init_block (void);
+local void pqdownheap (ct_data near * tree, int k);
+local void gen_bitlen (tree_desc near * desc);
+local void gen_codes (ct_data near * tree, int max_code);
+local void build_tree (tree_desc near * desc);
+local void scan_tree (ct_data near * tree, int max_code);
+local void send_tree (ct_data near * tree, int max_code);
+local int build_bl_tree (void);
+local void send_all_trees (int lcodes, int dcodes, int blcodes);
+local void compress_block (ct_data near * ltree, ct_data near * dtree);
+local void set_file_type (void);
#ifndef DEBUG
# define send_code(c, tree) send_bits(tree[c].Code, tree[c].Len)
/* Send a code of the given tree. c and tree must not have side effects */
-#else /* DEBUG */
+#else /* DEBUG */
# define send_code(c, tree) \
{ if (verbose>1) fprintf(stderr,"\ncd %3d ",(c)); \
send_bits(tree[c].Code, tree[c].Len); }
* used.
*/
-#define MAX(a,b) (a >= b ? a : b)
/* the arguments must not have side effects */
/* ===========================================================================
* (DEFLATE/STORE).
*/
void ct_init(attr, methodp)
- ush *attr; /* pointer to internal file attribute */
- int *methodp; /* pointer to compression method */
+ush *attr; /* pointer to internal file attribute */
+int *methodp; /* pointer to compression method */
{
- int n; /* iterates over tree elements */
- int bits; /* bit counter */
- int length; /* length value */
- int code; /* code value */
- int dist; /* distance index */
-
- file_type = attr;
- file_method = methodp;
- compressed_len = input_len = 0L;
-
- if (static_dtree[0].Len != 0) return; /* ct_init already called */
-
- /* Initialize the mapping length (0..255) -> length code (0..28) */
- length = 0;
- for (code = 0; code < LENGTH_CODES-1; code++) {
- base_length[code] = length;
- for (n = 0; n < (1<<extra_lbits[code]); n++) {
- length_code[length++] = (uch)code;
- }
- }
- Assert (length == 256, "ct_init: length != 256");
- /* Note that the length 255 (match length 258) can be represented
- * in two different ways: code 284 + 5 bits or code 285, so we
- * overwrite length_code[255] to use the best encoding:
- */
- length_code[length-1] = (uch)code;
-
- /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
- dist = 0;
- for (code = 0 ; code < 16; code++) {
- base_dist[code] = dist;
- for (n = 0; n < (1<<extra_dbits[code]); n++) {
- dist_code[dist++] = (uch)code;
- }
- }
- Assert (dist == 256, "ct_init: dist != 256");
- dist >>= 7; /* from now on, all distances are divided by 128 */
- for ( ; code < D_CODES; code++) {
- base_dist[code] = dist << 7;
- for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
- dist_code[256 + dist++] = (uch)code;
- }
- }
- Assert (dist == 256, "ct_init: 256+dist != 512");
-
- /* Construct the codes of the static literal tree */
- for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
- n = 0;
- while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
- while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
- while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
- while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
- /* Codes 286 and 287 do not exist, but we must include them in the
- * tree construction to get a canonical Huffman tree (longest code
- * all ones)
- */
- gen_codes((ct_data near *)static_ltree, L_CODES+1);
-
- /* The static distance tree is trivial: */
- for (n = 0; n < D_CODES; n++) {
- static_dtree[n].Len = 5;
- static_dtree[n].Code = bi_reverse(n, 5);
- }
-
- /* Initialize the first block of the first file: */
- init_block();
+ int n; /* iterates over tree elements */
+ int bits; /* bit counter */
+ int length; /* length value */
+ int code; /* code value */
+ int dist; /* distance index */
+
+ file_type = attr;
+ file_method = methodp;
+ compressed_len = input_len = 0L;
+
+ if (static_dtree[0].Len != 0)
+ return; /* ct_init already called */
+
+ /* Initialize the mapping length (0..255) -> length code (0..28) */
+ length = 0;
+ for (code = 0; code < LENGTH_CODES - 1; code++) {
+ base_length[code] = length;
+ for (n = 0; n < (1 << extra_lbits[code]); n++) {
+ length_code[length++] = (uch) code;
+ }
+ }
+ Assert(length == 256, "ct_init: length != 256");
+ /* Note that the length 255 (match length 258) can be represented
+ * in two different ways: code 284 + 5 bits or code 285, so we
+ * overwrite length_code[255] to use the best encoding:
+ */
+ length_code[length - 1] = (uch) code;
+
+ /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
+ dist = 0;
+ for (code = 0; code < 16; code++) {
+ base_dist[code] = dist;
+ for (n = 0; n < (1 << extra_dbits[code]); n++) {
+ dist_code[dist++] = (uch) code;
+ }
+ }
+ Assert(dist == 256, "ct_init: dist != 256");
+ dist >>= 7; /* from now on, all distances are divided by 128 */
+ for (; code < D_CODES; code++) {
+ base_dist[code] = dist << 7;
+ for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
+ dist_code[256 + dist++] = (uch) code;
+ }
+ }
+ Assert(dist == 256, "ct_init: 256+dist != 512");
+
+ /* Construct the codes of the static literal tree */
+ for (bits = 0; bits <= MAX_BITS; bits++)
+ bl_count[bits] = 0;
+ n = 0;
+ while (n <= 143)
+ static_ltree[n++].Len = 8, bl_count[8]++;
+ while (n <= 255)
+ static_ltree[n++].Len = 9, bl_count[9]++;
+ while (n <= 279)
+ static_ltree[n++].Len = 7, bl_count[7]++;
+ while (n <= 287)
+ static_ltree[n++].Len = 8, bl_count[8]++;
+ /* Codes 286 and 287 do not exist, but we must include them in the
+ * tree construction to get a canonical Huffman tree (longest code
+ * all ones)
+ */
+ gen_codes((ct_data near *) static_ltree, L_CODES + 1);
+
+ /* The static distance tree is trivial: */
+ for (n = 0; n < D_CODES; n++) {
+ static_dtree[n].Len = 5;
+ static_dtree[n].Code = bi_reverse(n, 5);
+ }
+
+ /* Initialize the first block of the first file: */
+ init_block();
}
/* ===========================================================================
*/
local void init_block()
{
- int n; /* iterates over tree elements */
-
- /* Initialize the trees. */
- for (n = 0; n < L_CODES; n++) dyn_ltree[n].Freq = 0;
- for (n = 0; n < D_CODES; n++) dyn_dtree[n].Freq = 0;
- for (n = 0; n < BL_CODES; n++) bl_tree[n].Freq = 0;
-
- dyn_ltree[END_BLOCK].Freq = 1;
- opt_len = static_len = 0L;
- last_lit = last_dist = last_flags = 0;
- flags = 0; flag_bit = 1;
+ int n; /* iterates over tree elements */
+
+ /* Initialize the trees. */
+ for (n = 0; n < L_CODES; n++)
+ dyn_ltree[n].Freq = 0;
+ for (n = 0; n < D_CODES; n++)
+ dyn_dtree[n].Freq = 0;
+ for (n = 0; n < BL_CODES; n++)
+ bl_tree[n].Freq = 0;
+
+ dyn_ltree[END_BLOCK].Freq = 1;
+ opt_len = static_len = 0L;
+ last_lit = last_dist = last_flags = 0;
+ flags = 0;
+ flag_bit = 1;
}
#define SMALLEST 1
* two sons).
*/
local void pqdownheap(tree, k)
- ct_data near *tree; /* the tree to restore */
- int k; /* node to move down */
+ct_data near *tree; /* the tree to restore */
+int k; /* node to move down */
{
- int v = heap[k];
- int j = k << 1; /* left son of k */
- while (j <= heap_len) {
- /* Set j to the smallest of the two sons: */
- if (j < heap_len && smaller(tree, heap[j+1], heap[j])) j++;
-
- /* Exit if v is smaller than both sons */
- if (smaller(tree, v, heap[j])) break;
-
- /* Exchange v with the smallest son */
- heap[k] = heap[j]; k = j;
-
- /* And continue down the tree, setting j to the left son of k */
- j <<= 1;
- }
- heap[k] = v;
+ int v = heap[k];
+ int j = k << 1; /* left son of k */
+
+ while (j <= heap_len) {
+ /* Set j to the smallest of the two sons: */
+ if (j < heap_len && smaller(tree, heap[j + 1], heap[j]))
+ j++;
+
+ /* Exit if v is smaller than both sons */
+ if (smaller(tree, v, heap[j]))
+ break;
+
+ /* Exchange v with the smallest son */
+ heap[k] = heap[j];
+ k = j;
+
+ /* And continue down the tree, setting j to the left son of k */
+ j <<= 1;
+ }
+ heap[k] = v;
}
/* ===========================================================================
* not null.
*/
local void gen_bitlen(desc)
- tree_desc near *desc; /* the tree descriptor */
+tree_desc near *desc; /* the tree descriptor */
{
- ct_data near *tree = desc->dyn_tree;
- int near *extra = desc->extra_bits;
- int base = desc->extra_base;
- int max_code = desc->max_code;
- int max_length = desc->max_length;
- ct_data near *stree = desc->static_tree;
- int h; /* heap index */
- int n, m; /* iterate over the tree elements */
- int bits; /* bit length */
- int xbits; /* extra bits */
- ush f; /* frequency */
- int overflow = 0; /* number of elements with bit length too large */
-
- for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
-
- /* In a first pass, compute the optimal bit lengths (which may
- * overflow in the case of the bit length tree).
- */
- tree[heap[heap_max]].Len = 0; /* root of the heap */
-
- for (h = heap_max+1; h < HEAP_SIZE; h++) {
- n = heap[h];
- bits = tree[tree[n].Dad].Len + 1;
- if (bits > max_length) bits = max_length, overflow++;
- tree[n].Len = (ush)bits;
- /* We overwrite tree[n].Dad which is no longer needed */
-
- if (n > max_code) continue; /* not a leaf node */
-
- bl_count[bits]++;
- xbits = 0;
- if (n >= base) xbits = extra[n-base];
- f = tree[n].Freq;
- opt_len += (ulg)f * (bits + xbits);
- if (stree) static_len += (ulg)f * (stree[n].Len + xbits);
- }
- if (overflow == 0) return;
-
- Trace((stderr,"\nbit length overflow\n"));
- /* This happens for example on obj2 and pic of the Calgary corpus */
-
- /* Find the first bit length which could increase: */
- do {
- bits = max_length-1;
- while (bl_count[bits] == 0) bits--;
- bl_count[bits]--; /* move one leaf down the tree */
- bl_count[bits+1] += 2; /* move one overflow item as its brother */
- bl_count[max_length]--;
- /* The brother of the overflow item also moves one step up,
- * but this does not affect bl_count[max_length]
- */
- overflow -= 2;
- } while (overflow > 0);
-
- /* Now recompute all bit lengths, scanning in increasing frequency.
- * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
- * lengths instead of fixing only the wrong ones. This idea is taken
- * from 'ar' written by Haruhiko Okumura.)
- */
- for (bits = max_length; bits != 0; bits--) {
- n = bl_count[bits];
- while (n != 0) {
- m = heap[--h];
- if (m > max_code) continue;
- if (tree[m].Len != (unsigned) bits) {
- Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
- opt_len += ((long)bits-(long)tree[m].Len)*(long)tree[m].Freq;
- tree[m].Len = (ush)bits;
- }
- n--;
- }
- }
+ ct_data near *tree = desc->dyn_tree;
+ int near *extra = desc->extra_bits;
+ int base = desc->extra_base;
+ int max_code = desc->max_code;
+ int max_length = desc->max_length;
+ ct_data near *stree = desc->static_tree;
+ int h; /* heap index */
+ int n, m; /* iterate over the tree elements */
+ int bits; /* bit length */
+ int xbits; /* extra bits */
+ ush f; /* frequency */
+ int overflow = 0; /* number of elements with bit length too large */
+
+ for (bits = 0; bits <= MAX_BITS; bits++)
+ bl_count[bits] = 0;
+
+ /* In a first pass, compute the optimal bit lengths (which may
+ * overflow in the case of the bit length tree).
+ */
+ tree[heap[heap_max]].Len = 0; /* root of the heap */
+
+ for (h = heap_max + 1; h < HEAP_SIZE; h++) {
+ n = heap[h];
+ bits = tree[tree[n].Dad].Len + 1;
+ if (bits > max_length)
+ bits = max_length, overflow++;
+ tree[n].Len = (ush) bits;
+ /* We overwrite tree[n].Dad which is no longer needed */
+
+ if (n > max_code)
+ continue; /* not a leaf node */
+
+ bl_count[bits]++;
+ xbits = 0;
+ if (n >= base)
+ xbits = extra[n - base];
+ f = tree[n].Freq;
+ opt_len += (ulg) f *(bits + xbits);
+
+ if (stree)
+ static_len += (ulg) f *(stree[n].Len + xbits);
+ }
+ if (overflow == 0)
+ return;
+
+ Trace((stderr, "\nbit length overflow\n"));
+ /* This happens for example on obj2 and pic of the Calgary corpus */
+
+ /* Find the first bit length which could increase: */
+ do {
+ bits = max_length - 1;
+ while (bl_count[bits] == 0)
+ bits--;
+ bl_count[bits]--; /* move one leaf down the tree */
+ bl_count[bits + 1] += 2; /* move one overflow item as its brother */
+ bl_count[max_length]--;
+ /* The brother of the overflow item also moves one step up,
+ * but this does not affect bl_count[max_length]
+ */
+ overflow -= 2;
+ } while (overflow > 0);
+
+ /* Now recompute all bit lengths, scanning in increasing frequency.
+ * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
+ * lengths instead of fixing only the wrong ones. This idea is taken
+ * from 'ar' written by Haruhiko Okumura.)
+ */
+ for (bits = max_length; bits != 0; bits--) {
+ n = bl_count[bits];
+ while (n != 0) {
+ m = heap[--h];
+ if (m > max_code)
+ continue;
+ if (tree[m].Len != (unsigned) bits) {
+ Trace(
+ (stderr, "code %d bits %d->%d\n", m, tree[m].Len,
+ bits));
+ opt_len +=
+ ((long) bits -
+ (long) tree[m].Len) * (long) tree[m].Freq;
+ tree[m].Len = (ush) bits;
+ }
+ n--;
+ }
+ }
}
/* ===========================================================================
* OUT assertion: the field code is set for all tree elements of non
* zero code length.
*/
-local void gen_codes (tree, max_code)
- ct_data near *tree; /* the tree to decorate */
- int max_code; /* largest code with non zero frequency */
+local void gen_codes(tree, max_code)
+ct_data near *tree; /* the tree to decorate */
+int max_code; /* largest code with non zero frequency */
{
- ush next_code[MAX_BITS+1]; /* next code value for each bit length */
- ush code = 0; /* running code value */
- int bits; /* bit index */
- int n; /* code index */
-
- /* The distribution counts are first used to generate the code values
- * without bit reversal.
- */
- for (bits = 1; bits <= MAX_BITS; bits++) {
- next_code[bits] = code = (code + bl_count[bits-1]) << 1;
- }
- /* Check that the bit counts in bl_count are consistent. The last code
- * must be all ones.
- */
- Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
- "inconsistent bit counts");
- Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
-
- for (n = 0; n <= max_code; n++) {
- int len = tree[n].Len;
- if (len == 0) continue;
- /* Now reverse the bits */
- tree[n].Code = bi_reverse(next_code[len]++, len);
-
- Tracec(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
- n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
- }
+ ush next_code[MAX_BITS + 1]; /* next code value for each bit length */
+ ush code = 0; /* running code value */
+ int bits; /* bit index */
+ int n; /* code index */
+
+ /* The distribution counts are first used to generate the code values
+ * without bit reversal.
+ */
+ for (bits = 1; bits <= MAX_BITS; bits++) {
+ next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
+ }
+ /* Check that the bit counts in bl_count are consistent. The last code
+ * must be all ones.
+ */
+ Assert(code + bl_count[MAX_BITS] - 1 == (1 << MAX_BITS) - 1,
+ "inconsistent bit counts");
+ Tracev((stderr, "\ngen_codes: max_code %d ", max_code));
+
+ for (n = 0; n <= max_code; n++) {
+ int len = tree[n].Len;
+
+ if (len == 0)
+ continue;
+ /* Now reverse the bits */
+ tree[n].Code = bi_reverse(next_code[len]++, len);
+
+ Tracec(tree != static_ltree,
+ (stderr, "\nn %3d %c l %2d c %4x (%x) ", n,
+ (isgraph(n) ? n : ' '), len, tree[n].Code,
+ next_code[len] - 1));
+ }
}
/* ===========================================================================
* also updated if stree is not null. The field max_code is set.
*/
local void build_tree(desc)
- tree_desc near *desc; /* the tree descriptor */
+tree_desc near *desc; /* the tree descriptor */
{
- ct_data near *tree = desc->dyn_tree;
- ct_data near *stree = desc->static_tree;
- int elems = desc->elems;
- int n, m; /* iterate over heap elements */
- int max_code = -1; /* largest code with non zero frequency */
- int node = elems; /* next internal node of the tree */
-
- /* Construct the initial heap, with least frequent element in
- * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
- * heap[0] is not used.
- */
- heap_len = 0, heap_max = HEAP_SIZE;
-
- for (n = 0; n < elems; n++) {
- if (tree[n].Freq != 0) {
- heap[++heap_len] = max_code = n;
- depth[n] = 0;
- } else {
- tree[n].Len = 0;
- }
- }
-
- /* The pkzip format requires that at least one distance code exists,
- * and that at least one bit should be sent even if there is only one
- * possible code. So to avoid special checks later on we force at least
- * two codes of non zero frequency.
- */
- while (heap_len < 2) {
- int new = heap[++heap_len] = (max_code < 2 ? ++max_code : 0);
- tree[new].Freq = 1;
- depth[new] = 0;
- opt_len--; if (stree) static_len -= stree[new].Len;
- /* new is 0 or 1 so it does not have extra bits */
- }
- desc->max_code = max_code;
-
- /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
- * establish sub-heaps of increasing lengths:
- */
- for (n = heap_len/2; n >= 1; n--) pqdownheap(tree, n);
-
- /* Construct the Huffman tree by repeatedly combining the least two
- * frequent nodes.
- */
- do {
- pqremove(tree, n); /* n = node of least frequency */
- m = heap[SMALLEST]; /* m = node of next least frequency */
-
- heap[--heap_max] = n; /* keep the nodes sorted by frequency */
- heap[--heap_max] = m;
-
- /* Create a new node father of n and m */
- tree[node].Freq = tree[n].Freq + tree[m].Freq;
- depth[node] = (uch) (MAX(depth[n], depth[m]) + 1);
- tree[n].Dad = tree[m].Dad = (ush)node;
+ ct_data near *tree = desc->dyn_tree;
+ ct_data near *stree = desc->static_tree;
+ int elems = desc->elems;
+ int n, m; /* iterate over heap elements */
+ int max_code = -1; /* largest code with non zero frequency */
+ int node = elems; /* next internal node of the tree */
+
+ /* Construct the initial heap, with least frequent element in
+ * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
+ * heap[0] is not used.
+ */
+ heap_len = 0, heap_max = HEAP_SIZE;
+
+ for (n = 0; n < elems; n++) {
+ if (tree[n].Freq != 0) {
+ heap[++heap_len] = max_code = n;
+ depth[n] = 0;
+ } else {
+ tree[n].Len = 0;
+ }
+ }
+
+ /* The pkzip format requires that at least one distance code exists,
+ * and that at least one bit should be sent even if there is only one
+ * possible code. So to avoid special checks later on we force at least
+ * two codes of non zero frequency.
+ */
+ while (heap_len < 2) {
+ int new = heap[++heap_len] = (max_code < 2 ? ++max_code : 0);
+
+ tree[new].Freq = 1;
+ depth[new] = 0;
+ opt_len--;
+ if (stree)
+ static_len -= stree[new].Len;
+ /* new is 0 or 1 so it does not have extra bits */
+ }
+ desc->max_code = max_code;
+
+ /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
+ * establish sub-heaps of increasing lengths:
+ */
+ for (n = heap_len / 2; n >= 1; n--)
+ pqdownheap(tree, n);
+
+ /* Construct the Huffman tree by repeatedly combining the least two
+ * frequent nodes.
+ */
+ do {
+ pqremove(tree, n); /* n = node of least frequency */
+ m = heap[SMALLEST]; /* m = node of next least frequency */
+
+ heap[--heap_max] = n; /* keep the nodes sorted by frequency */
+ heap[--heap_max] = m;
+
+ /* Create a new node father of n and m */
+ tree[node].Freq = tree[n].Freq + tree[m].Freq;
+ depth[node] = (uch) (MAX(depth[n], depth[m]) + 1);
+ tree[n].Dad = tree[m].Dad = (ush) node;
#ifdef DUMP_BL_TREE
- if (tree == bl_tree) {
- fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
- node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
- }
+ if (tree == bl_tree) {
+ fprintf(stderr, "\nnode %d(%d), sons %d(%d) %d(%d)",
+ node, tree[node].Freq, n, tree[n].Freq, m,
+ tree[m].Freq);
+ }
#endif
- /* and insert the new node in the heap */
- heap[SMALLEST] = node++;
- pqdownheap(tree, SMALLEST);
+ /* and insert the new node in the heap */
+ heap[SMALLEST] = node++;
+ pqdownheap(tree, SMALLEST);
- } while (heap_len >= 2);
+ } while (heap_len >= 2);
- heap[--heap_max] = heap[SMALLEST];
+ heap[--heap_max] = heap[SMALLEST];
- /* At this point, the fields freq and dad are set. We can now
- * generate the bit lengths.
- */
- gen_bitlen((tree_desc near *)desc);
+ /* At this point, the fields freq and dad are set. We can now
+ * generate the bit lengths.
+ */
+ gen_bitlen((tree_desc near *) desc);
- /* The field len is now set, we can generate the bit codes */
- gen_codes ((ct_data near *)tree, max_code);
+ /* The field len is now set, we can generate the bit codes */
+ gen_codes((ct_data near *) tree, max_code);
}
/* ===========================================================================
* counts. (The contribution of the bit length codes will be added later
* during the construction of bl_tree.)
*/
-local void scan_tree (tree, max_code)
- ct_data near *tree; /* the tree to be scanned */
- int max_code; /* and its largest code of non zero frequency */
+local void scan_tree(tree, max_code)
+ct_data near *tree; /* the tree to be scanned */
+int max_code; /* and its largest code of non zero frequency */
{
- int n; /* iterates over all tree elements */
- int prevlen = -1; /* last emitted length */
- int curlen; /* length of current code */
- int nextlen = tree[0].Len; /* length of next code */
- int count = 0; /* repeat count of the current code */
- int max_count = 7; /* max repeat count */
- int min_count = 4; /* min repeat count */
-
- if (nextlen == 0) max_count = 138, min_count = 3;
- tree[max_code+1].Len = (ush)0xffff; /* guard */
-
- for (n = 0; n <= max_code; n++) {
- curlen = nextlen; nextlen = tree[n+1].Len;
- if (++count < max_count && curlen == nextlen) {
- continue;
- } else if (count < min_count) {
- bl_tree[curlen].Freq += count;
- } else if (curlen != 0) {
- if (curlen != prevlen) bl_tree[curlen].Freq++;
- bl_tree[REP_3_6].Freq++;
- } else if (count <= 10) {
- bl_tree[REPZ_3_10].Freq++;
- } else {
- bl_tree[REPZ_11_138].Freq++;
- }
- count = 0; prevlen = curlen;
- if (nextlen == 0) {
- max_count = 138, min_count = 3;
- } else if (curlen == nextlen) {
- max_count = 6, min_count = 3;
- } else {
- max_count = 7, min_count = 4;
- }
- }
+ int n; /* iterates over all tree elements */
+ int prevlen = -1; /* last emitted length */
+ int curlen; /* length of current code */
+ int nextlen = tree[0].Len; /* length of next code */
+ int count = 0; /* repeat count of the current code */
+ int max_count = 7; /* max repeat count */
+ int min_count = 4; /* min repeat count */
+
+ if (nextlen == 0)
+ max_count = 138, min_count = 3;
+ tree[max_code + 1].Len = (ush) 0xffff; /* guard */
+
+ for (n = 0; n <= max_code; n++) {
+ curlen = nextlen;
+ nextlen = tree[n + 1].Len;
+ if (++count < max_count && curlen == nextlen) {
+ continue;
+ } else if (count < min_count) {
+ bl_tree[curlen].Freq += count;
+ } else if (curlen != 0) {
+ if (curlen != prevlen)
+ bl_tree[curlen].Freq++;
+ bl_tree[REP_3_6].Freq++;
+ } else if (count <= 10) {
+ bl_tree[REPZ_3_10].Freq++;
+ } else {
+ bl_tree[REPZ_11_138].Freq++;
+ }
+ count = 0;
+ prevlen = curlen;
+ if (nextlen == 0) {
+ max_count = 138, min_count = 3;
+ } else if (curlen == nextlen) {
+ max_count = 6, min_count = 3;
+ } else {
+ max_count = 7, min_count = 4;
+ }
+ }
}
/* ===========================================================================
* Send a literal or distance tree in compressed form, using the codes in
* bl_tree.
*/
-local void send_tree (tree, max_code)
- ct_data near *tree; /* the tree to be scanned */
- int max_code; /* and its largest code of non zero frequency */
+local void send_tree(tree, max_code)
+ct_data near *tree; /* the tree to be scanned */
+int max_code; /* and its largest code of non zero frequency */
{
- int n; /* iterates over all tree elements */
- int prevlen = -1; /* last emitted length */
- int curlen; /* length of current code */
- int nextlen = tree[0].Len; /* length of next code */
- int count = 0; /* repeat count of the current code */
- int max_count = 7; /* max repeat count */
- int min_count = 4; /* min repeat count */
-
- /* tree[max_code+1].Len = -1; */ /* guard already set */
- if (nextlen == 0) max_count = 138, min_count = 3;
-
- for (n = 0; n <= max_code; n++) {
- curlen = nextlen; nextlen = tree[n+1].Len;
- if (++count < max_count && curlen == nextlen) {
- continue;
- } else if (count < min_count) {
- do { send_code(curlen, bl_tree); } while (--count != 0);
-
- } else if (curlen != 0) {
- if (curlen != prevlen) {
- send_code(curlen, bl_tree); count--;
- }
- Assert(count >= 3 && count <= 6, " 3_6?");
- send_code(REP_3_6, bl_tree); send_bits(count-3, 2);
-
- } else if (count <= 10) {
- send_code(REPZ_3_10, bl_tree); send_bits(count-3, 3);
-
- } else {
- send_code(REPZ_11_138, bl_tree); send_bits(count-11, 7);
- }
- count = 0; prevlen = curlen;
- if (nextlen == 0) {
- max_count = 138, min_count = 3;
- } else if (curlen == nextlen) {
- max_count = 6, min_count = 3;
- } else {
- max_count = 7, min_count = 4;
- }
- }
+ int n; /* iterates over all tree elements */
+ int prevlen = -1; /* last emitted length */
+ int curlen; /* length of current code */
+ int nextlen = tree[0].Len; /* length of next code */
+ int count = 0; /* repeat count of the current code */
+ int max_count = 7; /* max repeat count */
+ int min_count = 4; /* min repeat count */
+
+/* tree[max_code+1].Len = -1; *//* guard already set */
+ if (nextlen == 0)
+ max_count = 138, min_count = 3;
+
+ for (n = 0; n <= max_code; n++) {
+ curlen = nextlen;
+ nextlen = tree[n + 1].Len;
+ if (++count < max_count && curlen == nextlen) {
+ continue;
+ } else if (count < min_count) {
+ do {
+ send_code(curlen, bl_tree);
+ } while (--count != 0);
+
+ } else if (curlen != 0) {
+ if (curlen != prevlen) {
+ send_code(curlen, bl_tree);
+ count--;
+ }
+ Assert(count >= 3 && count <= 6, " 3_6?");
+ send_code(REP_3_6, bl_tree);
+ send_bits(count - 3, 2);
+
+ } else if (count <= 10) {
+ send_code(REPZ_3_10, bl_tree);
+ send_bits(count - 3, 3);
+
+ } else {
+ send_code(REPZ_11_138, bl_tree);
+ send_bits(count - 11, 7);
+ }
+ count = 0;
+ prevlen = curlen;
+ if (nextlen == 0) {
+ max_count = 138, min_count = 3;
+ } else if (curlen == nextlen) {
+ max_count = 6, min_count = 3;
+ } else {
+ max_count = 7, min_count = 4;
+ }
+ }
}
/* ===========================================================================
*/
local int build_bl_tree()
{
- int max_blindex; /* index of last bit length code of non zero freq */
-
- /* Determine the bit length frequencies for literal and distance trees */
- scan_tree((ct_data near *)dyn_ltree, l_desc.max_code);
- scan_tree((ct_data near *)dyn_dtree, d_desc.max_code);
-
- /* Build the bit length tree: */
- build_tree((tree_desc near *)(&bl_desc));
- /* opt_len now includes the length of the tree representations, except
- * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
- */
-
- /* Determine the number of bit length codes to send. The pkzip format
- * requires that at least 4 bit length codes be sent. (appnote.txt says
- * 3 but the actual value used is 4.)
- */
- for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
- if (bl_tree[bl_order[max_blindex]].Len != 0) break;
- }
- /* Update opt_len to include the bit length tree and counts */
- opt_len += 3*(max_blindex+1) + 5+5+4;
- Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld", opt_len, static_len));
-
- return max_blindex;
+ int max_blindex; /* index of last bit length code of non zero freq */
+
+ /* Determine the bit length frequencies for literal and distance trees */
+ scan_tree((ct_data near *) dyn_ltree, l_desc.max_code);
+ scan_tree((ct_data near *) dyn_dtree, d_desc.max_code);
+
+ /* Build the bit length tree: */
+ build_tree((tree_desc near *) (&bl_desc));
+ /* opt_len now includes the length of the tree representations, except
+ * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+ */
+
+ /* Determine the number of bit length codes to send. The pkzip format
+ * requires that at least 4 bit length codes be sent. (appnote.txt says
+ * 3 but the actual value used is 4.)
+ */
+ for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
+ if (bl_tree[bl_order[max_blindex]].Len != 0)
+ break;
+ }
+ /* Update opt_len to include the bit length tree and counts */
+ opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;
+ Tracev(
+ (stderr, "\ndyn trees: dyn %ld, stat %ld", opt_len,
+ static_len));
+
+ return max_blindex;
}
/* ===========================================================================
* IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
*/
local void send_all_trees(lcodes, dcodes, blcodes)
- int lcodes, dcodes, blcodes; /* number of codes for each tree */
+int lcodes, dcodes, blcodes; /* number of codes for each tree */
{
- int rank; /* index in bl_order */
-
- Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
- Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
- "too many codes");
- Tracev((stderr, "\nbl counts: "));
- send_bits(lcodes-257, 5); /* not +255 as stated in appnote.txt */
- send_bits(dcodes-1, 5);
- send_bits(blcodes-4, 4); /* not -3 as stated in appnote.txt */
- for (rank = 0; rank < blcodes; rank++) {
- Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
- send_bits(bl_tree[bl_order[rank]].Len, 3);
- }
- Tracev((stderr, "\nbl tree: sent %ld", bits_sent));
-
- send_tree((ct_data near *)dyn_ltree, lcodes-1); /* send the literal tree */
- Tracev((stderr, "\nlit tree: sent %ld", bits_sent));
-
- send_tree((ct_data near *)dyn_dtree, dcodes-1); /* send the distance tree */
- Tracev((stderr, "\ndist tree: sent %ld", bits_sent));
+ int rank; /* index in bl_order */
+
+ Assert(lcodes >= 257 && dcodes >= 1
+ && blcodes >= 4, "not enough codes");
+ Assert(lcodes <= L_CODES && dcodes <= D_CODES
+ && blcodes <= BL_CODES, "too many codes");
+ Tracev((stderr, "\nbl counts: "));
+ send_bits(lcodes - 257, 5); /* not +255 as stated in appnote.txt */
+ send_bits(dcodes - 1, 5);
+ send_bits(blcodes - 4, 4); /* not -3 as stated in appnote.txt */
+ for (rank = 0; rank < blcodes; rank++) {
+ Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
+ send_bits(bl_tree[bl_order[rank]].Len, 3);
+ }
+ Tracev((stderr, "\nbl tree: sent %ld", bits_sent));
+
+ send_tree((ct_data near *) dyn_ltree, lcodes - 1); /* send the literal tree */
+ Tracev((stderr, "\nlit tree: sent %ld", bits_sent));
+
+ send_tree((ct_data near *) dyn_dtree, dcodes - 1); /* send the distance tree */
+ Tracev((stderr, "\ndist tree: sent %ld", bits_sent));
}
/* ===========================================================================
* returns the total compressed length for the file so far.
*/
ulg flush_block(buf, stored_len, eof)
- char *buf; /* input block, or NULL if too old */
- ulg stored_len; /* length of input block */
- int eof; /* true if this is the last block for a file */
+char *buf; /* input block, or NULL if too old */
+ulg stored_len; /* length of input block */
+int eof; /* true if this is the last block for a file */
{
- ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
- int max_blindex; /* index of last bit length code of non zero freq */
-
- flag_buf[last_flags] = flags; /* Save the flags for the last 8 items */
-
- /* Check if the file is ascii or binary */
- if (*file_type == (ush)UNKNOWN) set_file_type();
-
- /* Construct the literal and distance trees */
- build_tree((tree_desc near *)(&l_desc));
- Tracev((stderr, "\nlit data: dyn %ld, stat %ld", opt_len, static_len));
-
- build_tree((tree_desc near *)(&d_desc));
- Tracev((stderr, "\ndist data: dyn %ld, stat %ld", opt_len, static_len));
- /* At this point, opt_len and static_len are the total bit lengths of
- * the compressed block data, excluding the tree representations.
- */
-
- /* Build the bit length tree for the above two trees, and get the index
- * in bl_order of the last bit length code to send.
- */
- max_blindex = build_bl_tree();
-
- /* Determine the best encoding. Compute first the block length in bytes */
- opt_lenb = (opt_len+3+7)>>3;
- static_lenb = (static_len+3+7)>>3;
- input_len += stored_len; /* for debugging only */
-
- Trace((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u dist %u ",
- opt_lenb, opt_len, static_lenb, static_len, stored_len,
- last_lit, last_dist));
-
- if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
-
- /* If compression failed and this is the first and last block,
- * and if the zip file can be seeked (to rewrite the local header),
- * the whole file is transformed into a stored file:
- */
+ ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
+ int max_blindex; /* index of last bit length code of non zero freq */
+
+ flag_buf[last_flags] = flags; /* Save the flags for the last 8 items */
+
+ /* Check if the file is ascii or binary */
+ if (*file_type == (ush) UNKNOWN)
+ set_file_type();
+
+ /* Construct the literal and distance trees */
+ build_tree((tree_desc near *) (&l_desc));
+ Tracev((stderr, "\nlit data: dyn %ld, stat %ld", opt_len, static_len));
+
+ build_tree((tree_desc near *) (&d_desc));
+ Tracev(
+ (stderr, "\ndist data: dyn %ld, stat %ld", opt_len,
+ static_len));
+ /* At this point, opt_len and static_len are the total bit lengths of
+ * the compressed block data, excluding the tree representations.
+ */
+
+ /* Build the bit length tree for the above two trees, and get the index
+ * in bl_order of the last bit length code to send.
+ */
+ max_blindex = build_bl_tree();
+
+ /* Determine the best encoding. Compute first the block length in bytes */
+ opt_lenb = (opt_len + 3 + 7) >> 3;
+ static_lenb = (static_len + 3 + 7) >> 3;
+ input_len += stored_len; /* for debugging only */
+
+ Trace(
+ (stderr,
+ "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u dist %u ",
+ opt_lenb, opt_len, static_lenb, static_len, stored_len,
+ last_lit, last_dist));
+
+ if (static_lenb <= opt_lenb)
+ opt_lenb = static_lenb;
+
+ /* If compression failed and this is the first and last block,
+ * and if the zip file can be seeked (to rewrite the local header),
+ * the whole file is transformed into a stored file:
+ */
#ifdef FORCE_METHOD
#else
- if (stored_len <= opt_lenb && eof && compressed_len == 0L && seekable()) {
+ if (stored_len <= opt_lenb && eof && compressed_len == 0L
+ && seekable()) {
#endif
- /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
- if (buf == (char*)0) error ("block vanished");
+ /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
+ if (buf == (char *) 0)
+ errorMsg("block vanished\n");
- copy_block(buf, (unsigned)stored_len, 0); /* without header */
- compressed_len = stored_len << 3;
- *file_method = STORED;
+ copy_block(buf, (unsigned) stored_len, 0); /* without header */
+ compressed_len = stored_len << 3;
+ *file_method = STORED;
#ifdef FORCE_METHOD
#else
- } else if (stored_len+4 <= opt_lenb && buf != (char*)0) {
- /* 4: two words for the lengths */
+ } else if (stored_len + 4 <= opt_lenb && buf != (char *) 0) {
+ /* 4: two words for the lengths */
#endif
- /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
- * Otherwise we can't have processed more than WSIZE input bytes since
- * the last block flush, because compression would have been
- * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
- * transform a block into a stored block.
- */
- send_bits((STORED_BLOCK<<1)+eof, 3); /* send block type */
- compressed_len = (compressed_len + 3 + 7) & ~7L;
- compressed_len += (stored_len + 4) << 3;
+ /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
+ * Otherwise we can't have processed more than WSIZE input bytes since
+ * the last block flush, because compression would have been
+ * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
+ * transform a block into a stored block.
+ */
+ send_bits((STORED_BLOCK << 1) + eof, 3); /* send block type */
+ compressed_len = (compressed_len + 3 + 7) & ~7L;
+ compressed_len += (stored_len + 4) << 3;
- copy_block(buf, (unsigned)stored_len, 1); /* with header */
+ copy_block(buf, (unsigned) stored_len, 1); /* with header */
#ifdef FORCE_METHOD
#else
- } else if (static_lenb == opt_lenb) {
-#endif
- send_bits((STATIC_TREES<<1)+eof, 3);
- compress_block((ct_data near *)static_ltree, (ct_data near *)static_dtree);
- compressed_len += 3 + static_len;
- } else {
- send_bits((DYN_TREES<<1)+eof, 3);
- send_all_trees(l_desc.max_code+1, d_desc.max_code+1, max_blindex+1);
- compress_block((ct_data near *)dyn_ltree, (ct_data near *)dyn_dtree);
- compressed_len += 3 + opt_len;
- }
- Assert (compressed_len == bits_sent, "bad compressed size");
- init_block();
-
- if (eof) {
- Assert (input_len == isize, "bad input size");
- bi_windup();
- compressed_len += 7; /* align on byte boundary */
- }
- Tracev((stderr,"\ncomprlen %lu(%lu) ", compressed_len>>3,
- compressed_len-7*eof));
-
- return compressed_len >> 3;
+ } else if (static_lenb == opt_lenb) {
+#endif
+ send_bits((STATIC_TREES << 1) + eof, 3);
+ compress_block((ct_data near *) static_ltree,
+ (ct_data near *) static_dtree);
+ compressed_len += 3 + static_len;
+ } else {
+ send_bits((DYN_TREES << 1) + eof, 3);
+ send_all_trees(l_desc.max_code + 1, d_desc.max_code + 1,
+ max_blindex + 1);
+ compress_block((ct_data near *) dyn_ltree,
+ (ct_data near *) dyn_dtree);
+ compressed_len += 3 + opt_len;
+ }
+ Assert(compressed_len == bits_sent, "bad compressed size");
+ init_block();
+
+ if (eof) {
+ Assert(input_len == isize, "bad input size");
+ bi_windup();
+ compressed_len += 7; /* align on byte boundary */
+ }
+ Tracev((stderr, "\ncomprlen %lu(%lu) ", compressed_len >> 3,
+ compressed_len - 7 * eof));
+
+ return compressed_len >> 3;
}
/* ===========================================================================
* Save the match info and tally the frequency counts. Return true if
* the current block must be flushed.
*/
-int ct_tally (dist, lc)
- int dist; /* distance of matched string */
- int lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
+int ct_tally(dist, lc)
+int dist; /* distance of matched string */
+int lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
{
- l_buf[last_lit++] = (uch)lc;
- if (dist == 0) {
- /* lc is the unmatched char */
- dyn_ltree[lc].Freq++;
- } else {
- /* Here, lc is the match length - MIN_MATCH */
- dist--; /* dist = match distance - 1 */
- Assert((ush)dist < (ush)MAX_DIST &&
- (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
- (ush)d_code(dist) < (ush)D_CODES, "ct_tally: bad match");
-
- dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
- dyn_dtree[d_code(dist)].Freq++;
-
- d_buf[last_dist++] = (ush)dist;
- flags |= flag_bit;
- }
- flag_bit <<= 1;
-
- /* Output the flags if they fill a byte: */
- if ((last_lit & 7) == 0) {
- flag_buf[last_flags++] = flags;
- flags = 0, flag_bit = 1;
- }
- /* Try to guess if it is profitable to stop the current block here */
- if ((last_lit & 0xfff) == 0) {
- /* Compute an upper bound for the compressed length */
- ulg out_length = (ulg)last_lit*8L;
- ulg in_length = (ulg)strstart-block_start;
- int dcode;
- for (dcode = 0; dcode < D_CODES; dcode++) {
- out_length += (ulg)dyn_dtree[dcode].Freq*(5L+extra_dbits[dcode]);
- }
- out_length >>= 3;
- Trace((stderr,"\nlast_lit %u, last_dist %u, in %ld, out ~%ld(%ld%%) ",
- last_lit, last_dist, in_length, out_length,
- 100L - out_length*100L/in_length));
- if (last_dist < last_lit/2 && out_length < in_length/2) return 1;
- }
- return (last_lit == LIT_BUFSIZE-1 || last_dist == DIST_BUFSIZE);
- /* We avoid equality with LIT_BUFSIZE because of wraparound at 64K
- * on 16 bit machines and because stored blocks are restricted to
- * 64K-1 bytes.
- */
+ l_buf[last_lit++] = (uch) lc;
+ if (dist == 0) {
+ /* lc is the unmatched char */
+ dyn_ltree[lc].Freq++;
+ } else {
+ /* Here, lc is the match length - MIN_MATCH */
+ dist--; /* dist = match distance - 1 */
+ Assert((ush) dist < (ush) MAX_DIST &&
+ (ush) lc <= (ush) (MAX_MATCH - MIN_MATCH) &&
+ (ush) d_code(dist) < (ush) D_CODES, "ct_tally: bad match");
+
+ dyn_ltree[length_code[lc] + LITERALS + 1].Freq++;
+ dyn_dtree[d_code(dist)].Freq++;
+
+ d_buf[last_dist++] = (ush) dist;
+ flags |= flag_bit;
+ }
+ flag_bit <<= 1;
+
+ /* Output the flags if they fill a byte: */
+ if ((last_lit & 7) == 0) {
+ flag_buf[last_flags++] = flags;
+ flags = 0, flag_bit = 1;
+ }
+ /* Try to guess if it is profitable to stop the current block here */
+ if ((last_lit & 0xfff) == 0) {
+ /* Compute an upper bound for the compressed length */
+ ulg out_length = (ulg) last_lit * 8L;
+ ulg in_length = (ulg) strstart - block_start;
+ int dcode;
+
+ for (dcode = 0; dcode < D_CODES; dcode++) {
+ out_length +=
+ (ulg) dyn_dtree[dcode].Freq * (5L + extra_dbits[dcode]);
+ }
+ out_length >>= 3;
+ Trace(
+ (stderr,
+ "\nlast_lit %u, last_dist %u, in %ld, out ~%ld(%ld%%) ",
+ last_lit, last_dist, in_length, out_length,
+ 100L - out_length * 100L / in_length));
+ if (last_dist < last_lit / 2 && out_length < in_length / 2)
+ return 1;
+ }
+ return (last_lit == LIT_BUFSIZE - 1 || last_dist == DIST_BUFSIZE);
+ /* We avoid equality with LIT_BUFSIZE because of wraparound at 64K
+ * on 16 bit machines and because stored blocks are restricted to
+ * 64K-1 bytes.
+ */
}
/* ===========================================================================
* Send the block data compressed using the given Huffman trees
*/
local void compress_block(ltree, dtree)
- ct_data near *ltree; /* literal tree */
- ct_data near *dtree; /* distance tree */
+ct_data near *ltree; /* literal tree */
+ct_data near *dtree; /* distance tree */
{
- unsigned dist; /* distance of matched string */
- int lc; /* match length or unmatched char (if dist == 0) */
- unsigned lx = 0; /* running index in l_buf */
- unsigned dx = 0; /* running index in d_buf */
- unsigned fx = 0; /* running index in flag_buf */
- uch flag = 0; /* current flags */
- unsigned code; /* the code to send */
- int extra; /* number of extra bits to send */
-
- if (last_lit != 0) do {
- if ((lx & 7) == 0) flag = flag_buf[fx++];
- lc = l_buf[lx++];
- if ((flag & 1) == 0) {
- send_code(lc, ltree); /* send a literal byte */
- Tracecv(isgraph(lc), (stderr," '%c' ", lc));
- } else {
- /* Here, lc is the match length - MIN_MATCH */
- code = length_code[lc];
- send_code(code+LITERALS+1, ltree); /* send the length code */
- extra = extra_lbits[code];
- if (extra != 0) {
- lc -= base_length[code];
- send_bits(lc, extra); /* send the extra length bits */
- }
- dist = d_buf[dx++];
- /* Here, dist is the match distance - 1 */
- code = d_code(dist);
- Assert (code < D_CODES, "bad d_code");
-
- send_code(code, dtree); /* send the distance code */
- extra = extra_dbits[code];
- if (extra != 0) {
- dist -= base_dist[code];
- send_bits(dist, extra); /* send the extra distance bits */
- }
- } /* literal or match pair ? */
- flag >>= 1;
- } while (lx < last_lit);
-
- send_code(END_BLOCK, ltree);
+ unsigned dist; /* distance of matched string */
+ int lc; /* match length or unmatched char (if dist == 0) */
+ unsigned lx = 0; /* running index in l_buf */
+ unsigned dx = 0; /* running index in d_buf */
+ unsigned fx = 0; /* running index in flag_buf */
+ uch flag = 0; /* current flags */
+ unsigned code; /* the code to send */
+ int extra; /* number of extra bits to send */
+
+ if (last_lit != 0)
+ do {
+ if ((lx & 7) == 0)
+ flag = flag_buf[fx++];
+ lc = l_buf[lx++];
+ if ((flag & 1) == 0) {
+ send_code(lc, ltree); /* send a literal byte */
+ Tracecv(isgraph(lc), (stderr, " '%c' ", lc));
+ } else {
+ /* Here, lc is the match length - MIN_MATCH */
+ code = length_code[lc];
+ send_code(code + LITERALS + 1, ltree); /* send the length code */
+ extra = extra_lbits[code];
+ if (extra != 0) {
+ lc -= base_length[code];
+ send_bits(lc, extra); /* send the extra length bits */
+ }
+ dist = d_buf[dx++];
+ /* Here, dist is the match distance - 1 */
+ code = d_code(dist);
+ Assert(code < D_CODES, "bad d_code");
+
+ send_code(code, dtree); /* send the distance code */
+ extra = extra_dbits[code];
+ if (extra != 0) {
+ dist -= base_dist[code];
+ send_bits(dist, extra); /* send the extra distance bits */
+ }
+ } /* literal or match pair ? */
+ flag >>= 1;
+ } while (lx < last_lit);
+
+ send_code(END_BLOCK, ltree);
}
/* ===========================================================================
*/
local void set_file_type()
{
- int n = 0;
- unsigned ascii_freq = 0;
- unsigned bin_freq = 0;
- while (n < 7) bin_freq += dyn_ltree[n++].Freq;
- while (n < 128) ascii_freq += dyn_ltree[n++].Freq;
- while (n < LITERALS) bin_freq += dyn_ltree[n++].Freq;
- *file_type = bin_freq > (ascii_freq >> 2) ? BINARY : ASCII;
- if (*file_type == BINARY && translate_eol) {
- warn("-l used on binary file", "");
- }
+ int n = 0;
+ unsigned ascii_freq = 0;
+ unsigned bin_freq = 0;
+
+ while (n < 7)
+ bin_freq += dyn_ltree[n++].Freq;
+ while (n < 128)
+ ascii_freq += dyn_ltree[n++].Freq;
+ while (n < LITERALS)
+ bin_freq += dyn_ltree[n++].Freq;
+ *file_type = bin_freq > (ascii_freq >> 2) ? BINARY : ASCII;
+ if (*file_type == BINARY && translate_eol) {
+ errorMsg("-l used on binary file\n");
+ }
}
+
/* util.c -- utility functions for gzip support
* Copyright (C) 1992-1993 Jean-loup Gailly
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License, see the file COPYING.
*/
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
# include <stdlib.h>
#else
- extern int errno;
+extern int errno;
#endif
-extern ulg crc_32_tab[]; /* crc table, defined below */
-
/* ===========================================================================
* Copy input to output unchanged: zcat == cat with --force.
* IN assertion: insize bytes have already been read in inbuf.
*/
int copy(in, out)
- int in, out; /* input and output file descriptors */
+int in, out; /* input and output file descriptors */
{
- errno = 0;
- while (insize != 0 && (int)insize != EOF) {
- write_buf(out, (char*)inbuf, insize);
- bytes_out += insize;
- insize = read(in, (char*)inbuf, INBUFSIZ);
- }
- if ((int)insize == EOF && errno != 0) {
- read_error();
- }
- bytes_in = bytes_out;
- return OK;
+ errno = 0;
+ while (insize != 0 && (int) insize != EOF) {
+ write_buf(out, (char *) inbuf, insize);
+ bytes_out += insize;
+ insize = read(in, (char *) inbuf, INBUFSIZ);
+ }
+ if ((int) insize == EOF && errno != 0) {
+ read_error_msg();
+ }
+ bytes_in = bytes_out;
+ return OK;
}
/* ========================================================================
* Put string s in lower case, return s.
*/
char *strlwr(s)
- char *s;
+char *s;
{
- char *t;
- for (t = s; *t; t++) *t = tolow(*t);
- return s;
+ char *t;
+
+ for (t = s; *t; t++)
+ *t = tolow(*t);
+ return s;
}
#if defined(NO_STRING_H) && !defined(STDC_HEADERS)
/* Provide missing strspn and strcspn functions. */
-# ifndef __STDC__
-# define const
-# endif
-
-int strspn OF((const char *s, const char *accept));
-int strcspn OF((const char *s, const char *reject));
+int strspn (const char *s, const char *accept);
+int strcspn (const char *s, const char *reject);
/* ========================================================================
* Return the length of the maximum initial segment
* of s which contains only characters in accept.
*/
int strspn(s, accept)
- const char *s;
- const char *accept;
+const char *s;
+const char *accept;
{
- register const char *p;
- register const char *a;
- register int count = 0;
-
- for (p = s; *p != '\0'; ++p) {
- for (a = accept; *a != '\0'; ++a) {
- if (*p == *a) break;
+ register const char *p;
+ register const char *a;
+ register int count = 0;
+
+ for (p = s; *p != '\0'; ++p) {
+ for (a = accept; *a != '\0'; ++a) {
+ if (*p == *a)
+ break;
+ }
+ if (*a == '\0')
+ return count;
+ ++count;
}
- if (*a == '\0') return count;
- ++count;
- }
- return count;
+ return count;
}
/* ========================================================================
* which contains no characters from reject.
*/
int strcspn(s, reject)
- const char *s;
- const char *reject;
+const char *s;
+const char *reject;
{
- register int count = 0;
+ register int count = 0;
- while (*s != '\0') {
- if (strchr(reject, *s++) != NULL) return count;
- ++count;
- }
- return count;
+ while (*s != '\0') {
+ if (strchr(reject, *s++) != NULL)
+ return count;
+ ++count;
+ }
+ return count;
}
-#endif /* NO_STRING_H */
+#endif /* NO_STRING_H */
/* ========================================================================
* Add an environment variable (if any) before argv, and update argc.
* Return the expanded environment variable to be freed later, or NULL
* if no options were added to argv.
*/
-#define SEPARATOR " \t" /* separators in env variable */
+#define SEPARATOR " \t" /* separators in env variable */
char *add_envopt(argcp, argvp, env)
- int *argcp; /* pointer to argc */
- char ***argvp; /* pointer to argv */
- char *env; /* name of environment variable */
+int *argcp; /* pointer to argc */
+char ***argvp; /* pointer to argv */
+char *env; /* name of environment variable */
{
- char *p; /* running pointer through env variable */
- char **oargv; /* runs through old argv array */
- char **nargv; /* runs through new argv array */
- int oargc = *argcp; /* old argc */
- int nargc = 0; /* number of arguments in env variable */
-
- env = (char*)getenv(env);
- if (env == NULL) return NULL;
-
- p = (char*)xmalloc(strlen(env)+1);
- env = strcpy(p, env); /* keep env variable intact */
-
- for (p = env; *p; nargc++ ) { /* move through env */
- p += strspn(p, SEPARATOR); /* skip leading separators */
- if (*p == '\0') break;
-
- p += strcspn(p, SEPARATOR); /* find end of word */
- if (*p) *p++ = '\0'; /* mark it */
- }
- if (nargc == 0) {
- free(env);
- return NULL;
- }
- *argcp += nargc;
- /* Allocate the new argv array, with an extra element just in case
- * the original arg list did not end with a NULL.
- */
- nargv = (char**)calloc(*argcp+1, sizeof(char *));
- if (nargv == NULL) error("out of memory");
- oargv = *argvp;
- *argvp = nargv;
-
- /* Copy the program name first */
- if (oargc-- < 0) error("argc<=0");
- *(nargv++) = *(oargv++);
-
- /* Then copy the environment args */
- for (p = env; nargc > 0; nargc--) {
- p += strspn(p, SEPARATOR); /* skip separators */
- *(nargv++) = p; /* store start */
- while (*p++) ; /* skip over word */
- }
-
- /* Finally copy the old args and add a NULL (usual convention) */
- while (oargc--) *(nargv++) = *(oargv++);
- *nargv = NULL;
- return env;
+ char *p; /* running pointer through env variable */
+ char **oargv; /* runs through old argv array */
+ char **nargv; /* runs through new argv array */
+ int oargc = *argcp; /* old argc */
+ int nargc = 0; /* number of arguments in env variable */
+
+ env = (char *) getenv(env);
+ if (env == NULL)
+ return NULL;
+
+ p = (char *) xmalloc(strlen(env) + 1);
+ env = strcpy(p, env); /* keep env variable intact */
+
+ for (p = env; *p; nargc++) { /* move through env */
+ p += strspn(p, SEPARATOR); /* skip leading separators */
+ if (*p == '\0')
+ break;
+
+ p += strcspn(p, SEPARATOR); /* find end of word */
+ if (*p)
+ *p++ = '\0'; /* mark it */
+ }
+ if (nargc == 0) {
+ free(env);
+ return NULL;
+ }
+ *argcp += nargc;
+ /* Allocate the new argv array, with an extra element just in case
+ * the original arg list did not end with a NULL.
+ */
+ nargv = (char **) calloc(*argcp + 1, sizeof(char *));
+
+ if (nargv == NULL)
+ errorMsg(memory_exhausted);
+ oargv = *argvp;
+ *argvp = nargv;
+
+ /* Copy the program name first */
+ if (oargc-- < 0)
+ errorMsg("argc<=0\n");
+ *(nargv++) = *(oargv++);
+
+ /* Then copy the environment args */
+ for (p = env; nargc > 0; nargc--) {
+ p += strspn(p, SEPARATOR); /* skip separators */
+ *(nargv++) = p; /* store start */
+ while (*p++); /* skip over word */
+ }
+
+ /* Finally copy the old args and add a NULL (usual convention) */
+ while (oargc--)
+ *(nargv++) = *(oargv++);
+ *nargv = NULL;
+ return env;
}
+
/* ========================================================================
* Display compression ratio on the given stream on 6 characters.
*/
void display_ratio(num, den, file)
- long num;
- long den;
- FILE *file;
+long num;
+long den;
+FILE *file;
{
- long ratio; /* 1000 times the compression ratio */
-
- if (den == 0) {
- ratio = 0; /* no compression */
- } else if (den < 2147483L) { /* (2**31 -1)/1000 */
- ratio = 1000L*num/den;
- } else {
- ratio = num/(den/1000L);
- }
- if (ratio < 0) {
- putc('-', file);
- ratio = -ratio;
- } else {
- putc(' ', file);
- }
- fprintf(file, "%2ld.%1ld%%", ratio / 10L, ratio % 10L);
+ long ratio; /* 1000 times the compression ratio */
+
+ if (den == 0) {
+ ratio = 0; /* no compression */
+ } else if (den < 2147483L) { /* (2**31 -1)/1000 */
+ ratio = 1000L * num / den;
+ } else {
+ ratio = num / (den / 1000L);
+ }
+ if (ratio < 0) {
+ putc('-', file);
+ ratio = -ratio;
+ } else {
+ putc(' ', file);
+ }
+ fprintf(file, "%2ld.%1ld%%", ratio / 10L, ratio % 10L);
}
* terms of the GNU General Public License, see the file COPYING.
*/
-#ifdef RCSID
-static char rcsid[] = "$Id: gzip.c,v 1.2 1999/10/06 20:25:32 andersen Exp $";
-#endif
-
#include <ctype.h>
#include <sys/types.h>
# include <fcntl.h>
#endif
-local ulg crc; /* crc on uncompressed file data */
-long header_bytes; /* number of bytes in gzip header */
+local ulg crc; /* crc on uncompressed file data */
+long header_bytes; /* number of bytes in gzip header */
/* ===========================================================================
* Deflate in to out.
* The variables time_stamp and save_orig_name are initialized.
*/
int zip(in, out)
- int in, out; /* input and output file descriptors */
+int in, out; /* input and output file descriptors */
{
- uch flags = 0; /* general purpose bit flags */
- ush attr = 0; /* ascii/binary flag */
- ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */
+ uch flags = 0; /* general purpose bit flags */
+ ush attr = 0; /* ascii/binary flag */
+ ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */
+
+ ifd = in;
+ ofd = out;
+ outcnt = 0;
- ifd = in;
- ofd = out;
- outcnt = 0;
+ /* Write the header to the gzip file. See algorithm.doc for the format */
- /* Write the header to the gzip file. See algorithm.doc for the format */
- method = DEFLATED;
- put_byte(GZIP_MAGIC[0]); /* magic header */
- put_byte(GZIP_MAGIC[1]);
- put_byte(DEFLATED); /* compression method */
+ method = DEFLATED;
+ put_byte(GZIP_MAGIC[0]); /* magic header */
+ put_byte(GZIP_MAGIC[1]);
+ put_byte(DEFLATED); /* compression method */
- put_byte(flags); /* general flags */
- put_long(time_stamp);
+ put_byte(flags); /* general flags */
+ put_long(time_stamp);
- /* Write deflated file to zip file */
- crc = updcrc(0, 0);
+ /* Write deflated file to zip file */
+ crc = updcrc(0, 0);
- bi_init(out);
- ct_init(&attr, &method);
- lm_init(&deflate_flags);
+ bi_init(out);
+ ct_init(&attr, &method);
+ lm_init(&deflate_flags);
- put_byte((uch)deflate_flags); /* extra flags */
- put_byte(OS_CODE); /* OS identifier */
+ put_byte((uch) deflate_flags); /* extra flags */
+ put_byte(OS_CODE); /* OS identifier */
- header_bytes = (long)outcnt;
+ header_bytes = (long) outcnt;
- (void)deflate();
+ (void) deflate();
- /* Write the crc and uncompressed size */
- put_long(crc);
- put_long(isize);
- header_bytes += 2*sizeof(long);
+ /* Write the crc and uncompressed size */
+ put_long(crc);
+ put_long(isize);
+ header_bytes += 2 * sizeof(long);
- flush_outbuf();
- return OK;
+ flush_outbuf();
+ return OK;
}
* IN assertion: size >= 2 (for end-of-line translation)
*/
int file_read(buf, size)
- char *buf;
- unsigned size;
+char *buf;
+unsigned size;
{
- unsigned len;
+ unsigned len;
- Assert(insize == 0, "inbuf not empty");
+ Assert(insize == 0, "inbuf not empty");
- len = read(ifd, buf, size);
- if (len == (unsigned)(-1) || len == 0) return (int)len;
+ len = read(ifd, buf, size);
+ if (len == (unsigned) (-1) || len == 0)
+ return (int) len;
- crc = updcrc((uch*)buf, len);
- isize += (ulg)len;
- return (int)len;
+ crc = updcrc((uch *) buf, len);
+ isize += (ulg) len;
+ return (int) len;
+}
+
+/* ===========================================================================
+ * Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
+ * (used for the compressed data only)
+ */
+void flush_outbuf()
+{
+ if (outcnt == 0)
+ return;
+
+ write_buf(ofd, (char *) outbuf, outcnt);
+ bytes_out += (ulg) outcnt;
+ outcnt = 0;
}
-#endif
projects / oweals / busybox.git / blobdiff