1 /* vi: set sw=4 ts=4: */
2 /* zcat : stripped version based on gzip sources
3 Sven Rudolph <sr1@inf.tu-dresden.de>
7 #define bb_need_name_too_long
8 #define BB_DECLARE_EXTERN
11 static const char gunzip_usage[] =
12 "gunzip [OPTION]... FILE\n\n"
13 "Uncompress FILE (or standard input if FILE is '-').\n\n"
16 "\t-c\tWrite output to standard output\n"
17 "\t-t\tTest compressed file integrity\n";
19 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
20 * Copyright (C) 1992-1993 Jean-loup Gailly
21 * The unzip code was written and put in the public domain by Mark Adler.
22 * Portions of the lzw code are derived from the public domain 'compress'
23 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
24 * Ken Turkowski, Dave Mack and Peter Jannesen.
26 * See the license_msg below and the file COPYING for the software license.
27 * See the file algorithm.doc for the compression algorithms and file formats.
31 static char *license_msg[] = {
32 " Copyright (C) 1992-1993 Jean-loup Gailly",
33 " This program is free software; you can redistribute it and/or modify",
34 " it under the terms of the GNU General Public License as published by",
35 " the Free Software Foundation; either version 2, or (at your option)",
36 " any later version.",
38 " This program is distributed in the hope that it will be useful,",
39 " but WITHOUT ANY WARRANTY; without even the implied warranty of",
40 " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
41 " GNU General Public License for more details.",
43 " You should have received a copy of the GNU General Public License",
44 " along with this program; if not, write to the Free Software",
45 " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
50 /* Compress files with zip algorithm and 'compress' interface.
51 * See usage() and help() functions below for all options.
53 * file.gz: compressed file with same mode, owner, and utimes
54 * or stdout with -c option or if stdin used as input.
55 * If the output file name had to be truncated, the original name is kept
56 * in the compressed file.
57 * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
59 * Using gz on MSDOS would create too many file name conflicts. For
60 * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
61 * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
62 * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
63 * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
65 * For the meaning of all compilation flags, see comments in Makefile.in.
69 #include <sys/types.h>
73 #include <sys/param.h> /* for PATH_MAX */
75 /* #include "tailor.h" */
77 /* tailor.h -- target dependent definitions
78 * Copyright (C) 1992-1993 Jean-loup Gailly.
79 * This is free software; you can redistribute it and/or modify it under the
80 * terms of the GNU General Public License, see the file COPYING.
83 /* The target dependent definitions should be defined here only.
84 * The target dependent functions should be defined in tailor.c.
89 #define get_char() get_byte()
90 #define put_char(c) put_byte(c)
92 /* #include "gzip.h" */
94 /* gzip.h -- common declarations for all gzip modules
95 * Copyright (C) 1992-1993 Jean-loup Gailly.
96 * This is free software; you can redistribute it and/or modify it under the
97 * terms of the GNU General Public License, see the file COPYING.
100 #if defined(__STDC__) || defined(PROTO)
101 # define OF(args) args
112 /* I don't like nested includes, but the string and io functions are used
116 #if !defined(NO_STRING_H) || defined(STDC_HEADERS)
118 # if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
121 # define memzero(s, n) memset ((voidp)(s), 0, (n))
123 # include <strings.h>
124 # define strchr index
125 # define strrchr rindex
126 # define memcpy(d, s, n) bcopy((s), (d), (n))
127 # define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
128 # define memzero(s, n) bzero((s), (n))
132 # define RETSIGTYPE void
137 typedef unsigned char uch;
138 typedef unsigned short ush;
139 typedef unsigned long ulg;
141 /* Return codes from gzip */
146 /* Compression methods (see algorithm.doc) */
149 extern int method; /* compression method */
151 /* To save memory for 16 bit systems, some arrays are overlaid between
152 * the various modules:
153 * deflate: prev+head window d_buf l_buf outbuf
154 * unlzw: tab_prefix tab_suffix stack inbuf outbuf
155 * inflate: window inbuf
156 * unpack: window inbuf prefix_len
157 * unlzh: left+right window c_table inbuf c_len
158 * For compression, input is done in window[]. For decompression, output
159 * is done in window except for unlzw.
164 # define INBUFSIZ 0x2000 /* input buffer size */
166 # define INBUFSIZ 0x8000 /* input buffer size */
169 #define INBUF_EXTRA 64 /* required by unlzw() */
173 # define OUTBUFSIZ 8192 /* output buffer size */
175 # define OUTBUFSIZ 16384 /* output buffer size */
178 #define OUTBUF_EXTRA 2048 /* required by unlzw() */
184 # define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
186 # define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
190 /*#define DYN_ALLOC*/
193 # define EXTERN(type, array) extern type * array
194 # define DECLARE(type, array, size) type * array
195 # define ALLOC(type, array, size) { \
196 array = (type*)calloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
197 if (array == NULL) errorMsg("insufficient memory"); \
199 # define FREE(array) {if (array != NULL) free(array), array=NULL;}
201 # define EXTERN(type, array) extern type array[]
202 # define DECLARE(type, array, size) type array[size]
203 # define ALLOC(type, array, size)
207 EXTERN(uch, inbuf); /* input buffer */
208 EXTERN(uch, outbuf); /* output buffer */
209 EXTERN(ush, d_buf); /* buffer for distances, see trees.c */
210 EXTERN(uch, window); /* Sliding window and suffix table (unlzw) */
211 #define tab_suffix window
213 # define tab_prefix prev /* hash link (see deflate.c) */
214 # define head (prev+WSIZE) /* hash head (see deflate.c) */
215 EXTERN(ush, tab_prefix); /* prefix code (see unlzw.c) */
217 # define tab_prefix0 prev
218 # define head tab_prefix1
219 EXTERN(ush, tab_prefix0); /* prefix for even codes */
220 EXTERN(ush, tab_prefix1); /* prefix for odd codes */
223 extern unsigned insize; /* valid bytes in inbuf */
224 extern unsigned inptr; /* index of next byte to be processed in inbuf */
225 extern unsigned outcnt; /* bytes in output buffer */
227 extern long bytes_in; /* number of input bytes */
228 extern long bytes_out; /* number of output bytes */
229 extern long header_bytes; /* number of bytes in gzip header */
231 extern long ifile_size; /* input file size, -1 for devices (debug only) */
233 typedef int file_t; /* Do not use stdio */
235 #define NO_FILE (-1) /* in memory compression */
238 #define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
241 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
242 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
243 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
244 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
245 #define COMMENT 0x10 /* bit 4 set: file comment present */
246 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
247 #define RESERVED 0xC0 /* bit 6,7: reserved */
250 # define WSIZE 0x8000 /* window size--must be a power of two, and */
251 #endif /* at least 32K for zip's deflate method */
254 #define MAX_MATCH 258
255 /* The minimum and maximum match lengths */
257 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
258 /* Minimum amount of lookahead, except at the end of the input file.
259 * See deflate.c for comments about the MIN_MATCH+1.
262 #define MAX_DIST (WSIZE-MIN_LOOKAHEAD)
263 /* In order to simplify the code, particularly on 16 bit machines, match
264 * distances are limited to MAX_DIST instead of WSIZE.
267 extern int exit_code; /* program exit code */
268 extern int verbose; /* be verbose (-v) */
269 extern int level; /* compression level */
270 extern int test; /* check .z file integrity */
271 extern int save_orig_name; /* set if original name must be saved */
273 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
274 #define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
276 /* put_byte is used for the compressed output, put_ubyte for the
277 * uncompressed output. However unlzw() uses window for its
278 * suffix table instead of its output buffer, so it does not use put_ubyte
279 * (to be cleaned up).
281 #define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
283 #define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
286 /* Output a 16 bit value, lsb first */
287 #define put_short(w) \
288 { if (outcnt < OUTBUFSIZ-2) { \
289 outbuf[outcnt++] = (uch) ((w) & 0xff); \
290 outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
292 put_byte((uch)((w) & 0xff)); \
293 put_byte((uch)((ush)(w) >> 8)); \
297 /* Output a 32 bit value to the bit stream, lsb first */
298 #define put_long(n) { \
299 put_short((n) & 0xffff); \
300 put_short(((ulg)(n)) >> 16); \
303 #define seekable() 0 /* force sequential output */
304 #define translate_eol 0 /* no option -a yet */
306 #define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
308 /* Macros for getting two-byte and four-byte header values */
309 #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
310 #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
312 /* Diagnostic functions */
314 # define Assert(cond,msg) {if(!(cond)) errorMsg(msg);}
315 # define Trace(x) fprintf x
316 # define Tracev(x) {if (verbose) fprintf x ;}
317 # define Tracevv(x) {if (verbose>1) fprintf x ;}
318 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
319 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
321 # define Assert(cond,msg)
326 # define Tracecv(c,x)
329 #define WARN(msg) {fprintf msg ; \
330 if (exit_code == OK) exit_code = WARNING;}
332 #define do_exit(c) exit(c)
336 extern int unzip OF((int in, int out));
339 RETSIGTYPE abort_gzip OF((void));
342 void lm_init OF((int pack_level, ush * flags));
343 ulg deflate OF((void));
346 void ct_init OF((ush * attr, int *method));
347 int ct_tally OF((int dist, int lc));
348 ulg flush_block OF((char *buf, ulg stored_len, int eof));
351 void bi_init OF((file_t zipfile));
352 void send_bits OF((int value, int length));
353 unsigned bi_reverse OF((unsigned value, int length));
354 void bi_windup OF((void));
355 void copy_block OF((char *buf, unsigned len, int header));
356 extern int (*read_buf) OF((char *buf, unsigned size));
359 extern int copy OF((int in, int out));
360 extern ulg updcrc OF((uch * s, unsigned n));
361 extern void clear_bufs OF((void));
362 extern int fill_inbuf OF((int eof_ok));
363 extern void flush_outbuf OF((void));
364 extern void flush_window OF((void));
365 extern void write_buf OF((int fd, voidp buf, unsigned cnt));
368 extern char *basename OF((char *fname));
369 #endif /* not __linux__ */
370 extern void read_error OF((void));
371 extern void write_error OF((void));
374 extern int inflate OF((void));
376 /* #include "lzw.h" */
378 /* lzw.h -- define the lzw functions.
379 * Copyright (C) 1992-1993 Jean-loup Gailly.
380 * This is free software; you can redistribute it and/or modify it under the
381 * terms of the GNU General Public License, see the file COPYING.
384 #if !defined(OF) && defined(lint)
391 #define INIT_BITS 9 /* Initial number of bits per code */
393 #define LZW_MAGIC "\037\235" /* Magic header for lzw files, 1F 9D */
395 #define BIT_MASK 0x1f /* Mask for 'number of compression bits' */
396 /* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
397 * It's a pity that old uncompress does not check bit 0x20. That makes
398 * extension of the format actually undesirable because old compress
399 * would just crash on the new format instead of giving a meaningful
400 * error message. It does check the number of bits, but it's more
401 * helpful to say "unsupported format, get a new version" than
402 * "can only handle 16 bits".
405 #define BLOCK_MODE 0x80
406 /* Block compression: if table is full and compression rate is dropping,
407 * clear the dictionary.
410 #define LZW_RESERVED 0x60 /* reserved bits */
412 #define CLEAR 256 /* flush the dictionary */
413 #define FIRST (CLEAR+1) /* first free entry */
415 extern int maxbits; /* max bits per code for LZW */
416 extern int block_mode; /* block compress mode -C compatible with 2.0 */
418 extern int lzw OF((int in, int out));
419 extern int unlzw OF((int in, int out));
422 /* #include "revision.h" */
424 /* revision.h -- define the version number
425 * Copyright (C) 1992-1993 Jean-loup Gailly.
426 * This is free software; you can redistribute it and/or modify it under the
427 * terms of the GNU General Public License, see the file COPYING.
430 #define VERSION "1.2.4"
432 #define REVDATE "18 Aug 93"
434 /* This version does not support compression into old compress format: */
439 /* #include "getopt.h" */
441 /* Declarations for getopt.
442 Copyright (C) 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
444 This program is free software; you can redistribute it and/or modify it
445 under the terms of the GNU General Public License as published by the
446 Free Software Foundation; either version 2, or (at your option) any
449 This program is distributed in the hope that it will be useful,
450 but WITHOUT ANY WARRANTY; without even the implied warranty of
451 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
452 GNU General Public License for more details.
454 You should have received a copy of the GNU General Public License
455 along with this program; if not, write to the Free Software
456 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
464 /* For communication from `getopt' to the caller.
465 When `getopt' finds an option that takes an argument,
466 the argument value is returned here.
467 Also, when `ordering' is RETURN_IN_ORDER,
468 each non-option ARGV-element is returned here. */
471 /* Index in ARGV of the next element to be scanned.
472 This is used for communication to and from the caller
473 and for communication between successive calls to `getopt'.
475 On entry to `getopt', zero means this is the first call; initialize.
477 When `getopt' returns EOF, this is the index of the first of the
478 non-option elements that the caller should itself scan.
480 Otherwise, `optind' communicates from one call to the next
481 how much of ARGV has been scanned so far. */
485 /* Callers store zero here to inhibit the error message `getopt' prints
486 for unrecognized options. */
490 /* Set to an option character which was unrecognized. */
494 /* Describe the long-named options requested by the application.
495 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
496 of `struct option' terminated by an element containing a name which is
499 The field `has_arg' is:
500 no_argument (or 0) if the option does not take an argument,
501 required_argument (or 1) if the option requires an argument,
502 optional_argument (or 2) if the option takes an optional argument.
504 If the field `flag' is not NULL, it points to a variable that is set
505 to the value given in the field `val' when the option is found, but
506 left unchanged if the option is not found.
508 To have a long-named option do something other than set an `int' to
509 a compiled-in constant, such as set a value from `optarg', set the
510 option's `flag' field to zero and its `val' field to a nonzero
511 value (the equivalent single-letter option character, if there is
512 one). For long options that have a zero `flag' field, `getopt'
513 returns the contents of the `val' field. */
521 /* has_arg can't be an enum because some compilers complain about
522 type mismatches in all the code that assumes it is an int. */
528 /* Names for the values of the `has_arg' field of `struct option'. */
530 #define no_argument 0
531 #define required_argument 1
532 #define optional_argument 2
534 #if __STDC__ || defined(PROTO)
535 #if defined(__GNU_LIBRARY__)
536 /* Many other libraries have conflicting prototypes for getopt, with
537 differences in the consts, in stdlib.h. To avoid compilation
538 errors, only prototype getopt for the GNU C library. */
539 extern int getopt(int argc, char *const *argv, const char *shortopts);
540 #endif /* not __GNU_LIBRARY__ */
541 extern int getopt_long(int argc, char *const *argv,
542 const char *shortopts,
543 const struct option *longopts, int *longind);
544 extern int getopt_long_only(int argc, char *const *argv,
545 const char *shortopts,
546 const struct option *longopts,
549 /* Internal only. Users should not call this directly. */
550 extern int _getopt_internal(int argc, char *const *argv,
551 const char *shortopts,
552 const struct option *longopts,
553 int *longind, int long_only);
554 #else /* not __STDC__ */
556 extern int getopt_long();
557 extern int getopt_long_only();
559 extern int _getopt_internal();
560 #endif /* not __STDC__ */
565 #endif /* _GETOPT_H */
572 typedef struct dirent dir_type;
574 # define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
575 # define DIR_OPT "DIRENT"
577 # define NLENGTH(dirent) ((dirent)->d_namlen)
579 # include <sys/dir.h>
580 typedef struct direct dir_type;
582 # define DIR_OPT "SYSDIR"
585 # include <sys/ndir.h>
586 typedef struct direct dir_type;
588 # define DIR_OPT "SYSNDIR"
592 typedef struct direct dir_type;
594 # define DIR_OPT "NDIR"
597 # define DIR_OPT "NO_DIR"
602 #if !defined(S_ISDIR) && defined(S_IFDIR)
603 # define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
605 #if !defined(S_ISREG) && defined(S_IFREG)
606 # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
608 typedef RETSIGTYPE(*sig_type) OF((int));
611 # define O_BINARY 0 /* creation mode for open() */
615 /* Pure BSD system? */
616 # include <sys/file.h>
618 # define O_CREAT FCREAT
621 # define O_EXCL FEXCL
626 # define S_IRUSR 0400
629 # define S_IWUSR 0200
631 #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
633 #ifndef MAX_PATH_LEN /* max pathname length */
635 # define MAX_PATH_LEN PATH_MAX
637 # define MAX_PATH_LEN 1024
647 off_t lseek OF((int fd, off_t offset, int whence));
653 DECLARE(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
654 DECLARE(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
655 DECLARE(ush, d_buf, DIST_BUFSIZE);
656 DECLARE(uch, window, 2L * WSIZE);
658 DECLARE(ush, tab_prefix, 1L << BITS);
660 DECLARE(ush, tab_prefix0, 1L << (BITS - 1));
661 DECLARE(ush, tab_prefix1, 1L << (BITS - 1));
664 /* local variables */
666 int test_mode = 0; /* check file integrity option */
667 int foreground; /* set if program run in foreground */
668 int maxbits = BITS; /* max bits per code for LZW */
669 int method = DEFLATED; /* compression method */
670 int exit_code = OK; /* program exit code */
671 int last_member; /* set for .zip and .Z files */
672 int part_nb; /* number of parts in .gz file */
673 long ifile_size; /* input file size, -1 for devices (debug only) */
675 long bytes_in; /* number of input bytes */
676 long bytes_out; /* number of output bytes */
677 long total_in = 0; /* input bytes for all files */
678 long total_out = 0; /* output bytes for all files */
679 struct stat istat; /* status for input file */
680 int ifd; /* input file descriptor */
681 int ofd; /* output file descriptor */
682 unsigned insize; /* valid bytes in inbuf */
683 unsigned inptr; /* index of next byte to be processed in inbuf */
684 unsigned outcnt; /* bytes in output buffer */
686 long header_bytes; /* number of bytes in gzip header */
688 /* local functions */
690 local int get_method OF((int in));
692 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
694 /* ======================================================================== */
695 int gunzip_main(int argc, char **argv)
697 int file_count; /* number of files to precess */
703 int delInputFile = 0;
706 char ifname[MAX_PATH_LEN + 1]; /* input file name */
707 char ofname[MAX_PATH_LEN + 1]; /* output file name */
712 if (strcmp(*argv, "zcat") == 0)
715 /* Parse any options */
716 while (--argc > 0 && **(++argv) == '-') {
717 if (*((*argv) + 1) == '\0') {
721 while (*(++(*argv))) {
736 foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
738 (void) signal(SIGINT, (sig_type) abort_gzip);
741 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
742 (void) signal(SIGTERM, (sig_type) abort_gzip);
746 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
747 (void) signal(SIGHUP, (sig_type) abort_gzip);
751 file_count = argc - optind;
753 /* Allocate all global buffers (for DYN_ALLOC option) */
754 ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
755 ALLOC(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
756 ALLOC(ush, d_buf, DIST_BUFSIZE);
757 ALLOC(uch, window, 2L * WSIZE);
759 ALLOC(ush, tab_prefix, 1L << BITS);
761 ALLOC(ush, tab_prefix0, 1L << (BITS - 1));
762 ALLOC(ush, tab_prefix1, 1L << (BITS - 1));
765 if (fromstdin == 1) {
766 strcpy(ofname, "stdin");
768 inFileNum = fileno(stdin);
769 ifile_size = -1L; /* convention for unknown size */
771 /* Open up the input file */
774 if (strlen(*argv) > MAX_PATH_LEN) {
775 fprintf(stderr, name_too_long, "gunzip");
778 strcpy(ifname, *argv);
780 /* Open input fille */
781 inFileNum = open(ifname, O_RDONLY);
786 /* Get the time stamp on the input file. */
787 result = stat(ifname, &statBuf);
792 ifile_size = statBuf.st_size;
795 if (to_stdout == 1) {
796 /* And get to work */
797 strcpy(ofname, "stdout");
798 outFileNum = fileno(stdout);
800 clear_bufs(); /* clear input and output buffers */
803 /* Actually do the compression/decompression. */
804 unzip(inFileNum, outFileNum);
806 } else if (test_mode) {
807 /* Actually do the compression/decompression. */
812 /* And get to work */
813 if (strlen(ifname) > MAX_PATH_LEN - 4) {
814 fprintf(stderr, name_too_long, "gunzip");
817 strcpy(ofname, ifname);
818 pos = strstr(ofname, ".gz");
823 pos = strstr(ofname, ".tgz");
831 /* Open output fille */
832 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
833 outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
835 outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL);
837 if (outFileNum < 0) {
841 /* Set permissions on the file */
842 fchmod(outFileNum, statBuf.st_mode);
844 clear_bufs(); /* clear input and output buffers */
847 /* Actually do the compression/decompression. */
848 result = unzip(inFileNum, outFileNum);
852 /* Delete the original file */
854 delFileName = ifname;
856 delFileName = ofname;
858 if (delInputFile == 1 && unlink(delFileName) < 0) {
867 /* ========================================================================
868 * Check the magic number of the input file and update ofname if an
869 * original name was given and to_stdout is not set.
870 * Return the compression method, -1 for error, -2 for warning.
871 * Set inptr to the offset of the next byte to be processed.
872 * Updates time_stamp if there is one and --no-time is not used.
873 * This function may be called repeatedly for an input file consisting
874 * of several contiguous gzip'ed members.
875 * IN assertions: there is at least one remaining compressed member.
876 * If the member is a zip file, it must be the only one.
878 local int get_method(in)
879 int in; /* input file descriptor */
881 uch flags; /* compression flags */
882 char magic[2]; /* magic header */
884 magic[0] = (char) get_byte();
885 magic[1] = (char) get_byte();
886 method = -1; /* unknown yet */
887 part_nb++; /* number of parts in gzip file */
889 last_member = RECORD_IO;
890 /* assume multiple members in gzip file except for record oriented I/O */
892 if (memcmp(magic, GZIP_MAGIC, 2) == 0) {
894 method = (int) get_byte();
895 if (method != DEFLATED) {
897 "unknown method %d -- get newer version of gzip\n",
902 flags = (uch) get_byte();
904 (ulg) get_byte(); /* Ignore time stamp */
909 (void) get_byte(); /* Ignore extra flags for the moment */
910 (void) get_byte(); /* Ignore OS type for the moment */
912 if ((flags & EXTRA_FIELD) != 0) {
913 unsigned len = (unsigned) get_byte();
915 len |= ((unsigned) get_byte()) << 8;
921 /* Discard original name if any */
922 if ((flags & ORIG_NAME) != 0) {
923 while (get_char() != 0) /* null */
927 /* Discard file comment if any */
928 if ((flags & COMMENT) != 0) {
929 while (get_char() != 0) /* null */
933 header_bytes = inptr + 2 * sizeof(long); /* include crc and size */
942 fprintf(stderr, "\nnot in gzip format\n");
946 WARN((stderr, "\ndecompression OK, trailing garbage ignored\n"));
951 /* ========================================================================
952 * Signal and error handler.
954 RETSIGTYPE abort_gzip()
959 /* unzip.c -- decompress files in gzip or pkzip format.
960 * Copyright (C) 1992-1993 Jean-loup Gailly
961 * This is free software; you can redistribute it and/or modify it under the
962 * terms of the GNU General Public License, see the file COPYING.
964 * The code in this file is derived from the file funzip.c written
965 * and put in the public domain by Mark Adler.
969 This version can extract files in gzip or pkzip format.
970 For the latter, only the first entry is extracted, and it has to be
971 either deflated or stored.
974 /* #include "crypt.h" */
976 /* crypt.h (dummy version) -- do not perform encryption
977 * Hardly worth copyrighting :-)
981 # undef CRYPT /* dummy version */
984 #define RAND_HEAD_LEN 12 /* length of encryption random header */
989 /* PKZIP header definitions */
990 #define LOCSIG 0x04034b50L /* four-byte lead-in (lsb first) */
991 #define LOCFLG 6 /* offset of bit flag */
992 #define CRPFLG 1 /* bit for encrypted entry */
993 #define EXTFLG 8 /* bit for extended local header */
994 #define LOCHOW 8 /* offset of compression method */
995 #define LOCTIM 10 /* file mod time (for decryption) */
996 #define LOCCRC 14 /* offset of crc */
997 #define LOCSIZ 18 /* offset of compressed size */
998 #define LOCLEN 22 /* offset of uncompressed length */
999 #define LOCFIL 26 /* offset of file name field length */
1000 #define LOCEXT 28 /* offset of extra field length */
1001 #define LOCHDR 30 /* size of local header, including sig */
1002 #define EXTHDR 16 /* size of extended local header, inc sig */
1007 char *key; /* not used--needed to link crypt.c */
1008 int pkzip = 0; /* set for a pkzip file */
1009 int ext_header = 0; /* set if extended local header */
1011 /* ===========================================================================
1012 * Unzip in to out. This routine works on both gzip and pkzip files.
1014 * IN assertions: the buffer inbuf contains already the beginning of
1015 * the compressed data, from offsets inptr to insize-1 included.
1016 * The magic header has already been checked. The output buffer is cleared.
1019 int in, out; /* input and output file descriptors */
1021 ulg orig_crc = 0; /* original crc */
1022 ulg orig_len = 0; /* original uncompressed length */
1024 uch buf[EXTHDR]; /* extended local header */
1028 method = get_method(ifd);
1030 do_exit(exit_code); /* error message already emitted */
1033 updcrc(NULL, 0); /* initialize crc */
1035 if (pkzip && !ext_header) { /* crc and length at the end otherwise */
1036 orig_crc = LG(inbuf + LOCCRC);
1037 orig_len = LG(inbuf + LOCLEN);
1041 if (method == DEFLATED) {
1043 int res = inflate();
1046 errorMsg("out of memory");
1047 } else if (res != 0) {
1048 errorMsg("invalid compressed data--format violated");
1052 errorMsg("internal error, invalid method");
1055 /* Get the crc and original length */
1057 /* crc32 (see algorithm.doc)
1058 * uncompressed input size modulo 2^32
1060 for (n = 0; n < 8; n++) {
1061 buf[n] = (uch) get_byte(); /* may cause an error if EOF */
1064 orig_len = LG(buf + 4);
1066 } else if (ext_header) { /* If extended header, check it */
1067 /* signature - 4bytes: 0x50 0x4b 0x07 0x08
1069 * compressed size 4-bytes
1070 * uncompressed size 4-bytes
1072 for (n = 0; n < EXTHDR; n++) {
1073 buf[n] = (uch) get_byte(); /* may cause an error if EOF */
1075 orig_crc = LG(buf + 4);
1076 orig_len = LG(buf + 12);
1079 /* Validate decompression */
1080 if (orig_crc != updcrc(outbuf, 0)) {
1081 errorMsg("invalid compressed data--crc error");
1083 if (orig_len != (ulg) bytes_out) {
1084 errorMsg("invalid compressed data--length error");
1087 /* Check if there are more entries in a pkzip file */
1088 if (pkzip && inptr + 4 < insize && LG(inbuf + inptr) == LOCSIG) {
1089 WARN((stderr, "has more than one entry--rest ignored\n"));
1091 ext_header = pkzip = 0; /* for next file */
1095 /* util.c -- utility functions for gzip support
1096 * Copyright (C) 1992-1993 Jean-loup Gailly
1097 * This is free software; you can redistribute it and/or modify it under the
1098 * terms of the GNU General Public License, see the file COPYING.
1103 #include <sys/types.h>
1105 #ifdef HAVE_UNISTD_H
1106 # include <unistd.h>
1112 #if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
1113 # include <stdlib.h>
1118 static const ulg crc_32_tab[]; /* crc table, defined below */
1120 /* ===========================================================================
1121 * Run a set of bytes through the crc shift register. If s is a NULL
1122 * pointer, then initialize the crc shift register contents instead.
1123 * Return the current crc in either case.
1126 uch *s; /* pointer to bytes to pump through */
1127 unsigned n; /* number of bytes in s[] */
1129 register ulg c; /* temporary variable */
1131 static ulg crc = (ulg) 0xffffffffL; /* shift register contents */
1139 c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8);
1143 return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
1146 /* ===========================================================================
1147 * Clear input and output buffers
1153 bytes_in = bytes_out = 0L;
1156 /* ===========================================================================
1157 * Fill the input buffer. This is called only when the buffer is empty.
1159 int fill_inbuf(eof_ok)
1160 int eof_ok; /* set if EOF acceptable as a result */
1164 /* Read as much as possible */
1168 len = read(ifd, (char *) inbuf + insize, INBUFSIZ - insize);
1169 if (len == 0 || len == EOF)
1172 } while (insize < INBUFSIZ);
1179 bytes_in += (ulg) insize;
1184 /* ===========================================================================
1185 * Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
1186 * (used for the compressed data only)
1194 write_buf(ofd, (char *) outbuf, outcnt);
1195 bytes_out += (ulg) outcnt;
1199 /* ===========================================================================
1200 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
1201 * (Used for the decompressed data only.)
1207 updcrc(window, outcnt);
1210 write_buf(ofd, (char *) window, outcnt);
1211 bytes_out += (ulg) outcnt;
1215 /* ===========================================================================
1216 * Does the same as write(), but also handles partial pipe writes and checks
1219 void write_buf(fd, buf, cnt)
1226 while ((n = write(fd, buf, cnt)) != cnt) {
1227 if (n == (unsigned) (-1)) {
1231 buf = (voidp) ((char *) buf + n);
1235 #if defined(NO_STRING_H) && !defined(STDC_HEADERS)
1237 /* Provide missing strspn and strcspn functions. */
1243 int strspn OF((const char *s, const char *accept));
1244 int strcspn OF((const char *s, const char *reject));
1246 /* ========================================================================
1247 * Return the length of the maximum initial segment
1248 * of s which contains only characters in accept.
1250 int strspn(s, accept)
1254 register const char *p;
1255 register const char *a;
1256 register int count = 0;
1258 for (p = s; *p != '\0'; ++p) {
1259 for (a = accept; *a != '\0'; ++a) {
1270 /* ========================================================================
1271 * Return the length of the maximum inital segment of s
1272 * which contains no characters from reject.
1274 int strcspn(s, reject)
1278 register int count = 0;
1280 while (*s != '\0') {
1281 if (strchr(reject, *s++) != NULL)
1288 #endif /* NO_STRING_H */
1291 /* ========================================================================
1296 fprintf(stderr, "\n");
1300 fprintf(stderr, "unexpected end of file\n");
1307 fprintf(stderr, "\n");
1313 /* ========================================================================
1314 * Table of CRC-32's of all single-byte values (made by makecrc.c)
1316 static const ulg crc_32_tab[] = {
1317 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
1318 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
1319 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
1320 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
1321 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
1322 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
1323 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
1324 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
1325 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
1326 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
1327 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
1328 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
1329 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
1330 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
1331 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
1332 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
1333 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
1334 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
1335 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
1336 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
1337 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
1338 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
1339 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
1340 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
1341 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
1342 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
1343 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
1344 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
1345 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
1346 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
1347 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
1348 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
1349 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
1350 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
1351 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
1352 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
1353 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
1354 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
1355 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
1356 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
1357 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
1358 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
1359 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
1360 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
1361 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
1362 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
1363 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
1364 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
1365 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
1366 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
1367 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
1371 /* inflate.c -- Not copyrighted 1992 by Mark Adler
1372 version c10p1, 10 January 1993 */
1374 /* You can do whatever you like with this source file, though I would
1375 prefer that if you modify it and redistribute it that you include
1376 comments to that effect with your name and the date. Thank you.
1377 [The history has been moved to the file ChangeLog.]
1381 Inflate deflated (PKZIP's method 8 compressed) data. The compression
1382 method searches for as much of the current string of bytes (up to a
1383 length of 258) in the previous 32K bytes. If it doesn't find any
1384 matches (of at least length 3), it codes the next byte. Otherwise, it
1385 codes the length of the matched string and its distance backwards from
1386 the current position. There is a single Huffman code that codes both
1387 single bytes (called "literals") and match lengths. A second Huffman
1388 code codes the distance information, which follows a length code. Each
1389 length or distance code actually represents a base value and a number
1390 of "extra" (sometimes zero) bits to get to add to the base value. At
1391 the end of each deflated block is a special end-of-block (EOB) literal/
1392 length code. The decoding process is basically: get a literal/length
1393 code; if EOB then done; if a literal, emit the decoded byte; if a
1394 length then get the distance and emit the referred-to bytes from the
1395 sliding window of previously emitted data.
1397 There are (currently) three kinds of inflate blocks: stored, fixed, and
1398 dynamic. The compressor deals with some chunk of data at a time, and
1399 decides which method to use on a chunk-by-chunk basis. A chunk might
1400 typically be 32K or 64K. If the chunk is uncompressible, then the
1401 "stored" method is used. In this case, the bytes are simply stored as
1402 is, eight bits per byte, with none of the above coding. The bytes are
1403 preceded by a count, since there is no longer an EOB code.
1405 If the data is compressible, then either the fixed or dynamic methods
1406 are used. In the dynamic method, the compressed data is preceded by
1407 an encoding of the literal/length and distance Huffman codes that are
1408 to be used to decode this block. The representation is itself Huffman
1409 coded, and so is preceded by a description of that code. These code
1410 descriptions take up a little space, and so for small blocks, there is
1411 a predefined set of codes, called the fixed codes. The fixed method is
1412 used if the block codes up smaller that way (usually for quite small
1413 chunks), otherwise the dynamic method is used. In the latter case, the
1414 codes are customized to the probabilities in the current block, and so
1415 can code it much better than the pre-determined fixed codes.
1417 The Huffman codes themselves are decoded using a mutli-level table
1418 lookup, in order to maximize the speed of decoding plus the speed of
1419 building the decoding tables. See the comments below that precede the
1420 lbits and dbits tuning parameters.
1425 Notes beyond the 1.93a appnote.txt:
1427 1. Distance pointers never point before the beginning of the output
1429 2. Distance pointers can point back across blocks, up to 32k away.
1430 3. There is an implied maximum of 7 bits for the bit length table and
1431 15 bits for the actual data.
1432 4. If only one code exists, then it is encoded using one bit. (Zero
1433 would be more efficient, but perhaps a little confusing.) If two
1434 codes exist, they are coded using one bit each (0 and 1).
1435 5. There is no way of sending zero distance codes--a dummy must be
1436 sent if there are none. (History: a pre 2.0 version of PKZIP would
1437 store blocks with no distance codes, but this was discovered to be
1438 too harsh a criterion.) Valid only for 1.93a. 2.04c does allow
1439 zero distance codes, which is sent as one code of zero bits in
1441 6. There are up to 286 literal/length codes. Code 256 represents the
1442 end-of-block. Note however that the static length tree defines
1443 288 codes just to fill out the Huffman codes. Codes 286 and 287
1444 cannot be used though, since there is no length base or extra bits
1445 defined for them. Similarly, there are up to 30 distance codes.
1446 However, static trees define 32 codes (all 5 bits) to fill out the
1447 Huffman codes, but the last two had better not show up in the data.
1448 7. Unzip can check dynamic Huffman blocks for complete code sets.
1449 The exception is that a single code would not be complete (see #4).
1450 8. The five bits following the block type is really the number of
1451 literal codes sent minus 257.
1452 9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits
1453 (1+6+6). Therefore, to output three times the length, you output
1454 three codes (1+1+1), whereas to output four times the same length,
1455 you only need two codes (1+3). Hmm.
1456 10. In the tree reconstruction algorithm, Code = Code + Increment
1457 only if BitLength(i) is not zero. (Pretty obvious.)
1458 11. Correction: 4 Bits: # of Bit Length codes - 4 (4 - 19)
1459 12. Note: length code 284 can represent 227-258, but length code 285
1460 really is 258. The last length deserves its own, short code
1461 since it gets used a lot in very redundant files. The length
1462 258 is special since 258 - 3 (the min match length) is 255.
1463 13. The literal/length and distance code bit lengths are read as a
1464 single stream of lengths. It is possible (and advantageous) for
1465 a repeat code (16, 17, or 18) to go across the boundary between
1466 the two sets of lengths.
1469 #include <sys/types.h>
1471 #if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
1472 # include <stdlib.h>
1476 #define slide window
1478 /* Huffman code lookup table entry--this entry is four bytes for machines
1479 that have 16-bit pointers (e.g. PC's in the small or medium model).
1480 Valid extra bits are 0..13. e == 15 is EOB (end of block), e == 16
1481 means that v is a literal, 16 < e < 32 means that v is a pointer to
1482 the next table, which codes e - 16 bits, and lastly e == 99 indicates
1483 an unused code. If a code with e == 99 is looked up, this implies an
1484 error in the data. */
1486 uch e; /* number of extra bits or operation */
1487 uch b; /* number of bits in this code or subcode */
1489 ush n; /* literal, length base, or distance base */
1490 struct huft *t; /* pointer to next level of table */
1495 /* Function prototypes */
1496 int huft_build OF((unsigned *, unsigned, unsigned, ush *, ush *,
1497 struct huft **, int *));
1498 int huft_free OF((struct huft *));
1499 int inflate_codes OF((struct huft *, struct huft *, int, int));
1500 int inflate_stored OF((void));
1501 int inflate_fixed OF((void));
1502 int inflate_dynamic OF((void));
1503 int inflate_block OF((int *));
1504 int inflate OF((void));
1507 /* The inflate algorithm uses a sliding 32K byte window on the uncompressed
1508 stream to find repeated byte strings. This is implemented here as a
1509 circular buffer. The index is updated simply by incrementing and then
1510 and'ing with 0x7fff (32K-1). */
1511 /* It is left to other modules to supply the 32K area. It is assumed
1512 to be usable as if it were declared "uch slide[32768];" or as just
1513 "uch *slide;" and then malloc'ed in the latter case. The definition
1514 must be in unzip.h, included above. */
1515 /* unsigned wp; current position in slide */
1517 #define flush_output(w) (wp=(w),flush_window())
1519 /* Tables for deflate from PKZIP's appnote.txt. */
1520 static unsigned border[] = { /* Order of the bit length code lengths */
1521 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
1523 static ush cplens[] = { /* Copy lengths for literal codes 257..285 */
1524 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
1525 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
1528 /* note: see note #13 above about the 258 in this list. */
1529 static ush cplext[] = { /* Extra bits for literal codes 257..285 */
1530 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
1531 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
1532 }; /* 99==invalid */
1533 static ush cpdist[] = { /* Copy offsets for distance codes 0..29 */
1534 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
1535 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
1536 8193, 12289, 16385, 24577
1538 static ush cpdext[] = { /* Extra bits for distance codes */
1539 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
1540 7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
1546 /* Macros for inflate() bit peeking and grabbing.
1550 x = b & mask_bits[j];
1553 where NEEDBITS makes sure that b has at least j bits in it, and
1554 DUMPBITS removes the bits from b. The macros use the variable k
1555 for the number of bits in b. Normally, b and k are register
1556 variables for speed, and are initialized at the beginning of a
1557 routine that uses these macros from a global bit buffer and count.
1559 If we assume that EOB will be the longest code, then we will never
1560 ask for bits with NEEDBITS that are beyond the end of the stream.
1561 So, NEEDBITS should not read any more bytes than are needed to
1562 meet the request. Then no bytes need to be "returned" to the buffer
1563 at the end of the last block.
1565 However, this assumption is not true for fixed blocks--the EOB code
1566 is 7 bits, but the other literal/length codes can be 8 or 9 bits.
1567 (The EOB code is shorter than other codes because fixed blocks are
1568 generally short. So, while a block always has an EOB, many other
1569 literal/length codes have a significantly lower probability of
1570 showing up at all.) However, by making the first table have a
1571 lookup of seven bits, the EOB code will be found in that first
1572 lookup, and so will not require that too many bits be pulled from
1576 ulg bb; /* bit buffer */
1577 unsigned bk; /* bits in bit buffer */
1581 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
1582 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
1588 # define NEXTBYTE() (cc = get_byte(), zdecode(cc), cc)
1590 # define NEXTBYTE() (uch)get_byte()
1592 #define NEEDBITS(n) {while(k<(n)){b|=((ulg)NEXTBYTE())<<k;k+=8;}}
1593 #define DUMPBITS(n) {b>>=(n);k-=(n);}
1597 Huffman code decoding is performed using a multi-level table lookup.
1598 The fastest way to decode is to simply build a lookup table whose
1599 size is determined by the longest code. However, the time it takes
1600 to build this table can also be a factor if the data being decoded
1601 is not very long. The most common codes are necessarily the
1602 shortest codes, so those codes dominate the decoding time, and hence
1603 the speed. The idea is you can have a shorter table that decodes the
1604 shorter, more probable codes, and then point to subsidiary tables for
1605 the longer codes. The time it costs to decode the longer codes is
1606 then traded against the time it takes to make longer tables.
1608 This results of this trade are in the variables lbits and dbits
1609 below. lbits is the number of bits the first level table for literal/
1610 length codes can decode in one step, and dbits is the same thing for
1611 the distance codes. Subsequent tables are also less than or equal to
1612 those sizes. These values may be adjusted either when all of the
1613 codes are shorter than that, in which case the longest code length in
1614 bits is used, or when the shortest code is *longer* than the requested
1615 table size, in which case the length of the shortest code in bits is
1618 There are two different values for the two tables, since they code a
1619 different number of possibilities each. The literal/length table
1620 codes 286 possible values, or in a flat code, a little over eight
1621 bits. The distance table codes 30 possible values, or a little less
1622 than five bits, flat. The optimum values for speed end up being
1623 about one bit more than those, so lbits is 8+1 and dbits is 5+1.
1624 The optimum values may differ though from machine to machine, and
1625 possibly even between compilers. Your mileage may vary.
1629 int lbits = 9; /* bits in base literal/length lookup table */
1630 int dbits = 6; /* bits in base distance lookup table */
1633 /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
1634 #define BMAX 16 /* maximum bit length of any code (16 for explode) */
1635 #define N_MAX 288 /* maximum number of codes in any set */
1638 unsigned hufts; /* track memory usage */
1641 int huft_build(b, n, s, d, e, t, m)
1642 unsigned *b; /* code lengths in bits (all assumed <= BMAX) */
1643 unsigned n; /* number of codes (assumed <= N_MAX) */
1644 unsigned s; /* number of simple-valued codes (0..s-1) */
1645 ush *d; /* list of base values for non-simple codes */
1646 ush *e; /* list of extra bits for non-simple codes */
1647 struct huft **t; /* result: starting table */
1648 int *m; /* maximum lookup bits, returns actual */
1650 /* Given a list of code lengths and a maximum table size, make a set of
1651 tables to decode that set of codes. Return zero on success, one if
1652 the given code set is incomplete (the tables are still built in this
1653 case), two if the input is invalid (all zero length codes or an
1654 oversubscribed set of lengths), and three if not enough memory. */
1656 unsigned a; /* counter for codes of length k */
1657 unsigned c[BMAX + 1]; /* bit length count table */
1658 unsigned f; /* i repeats in table every f entries */
1659 int g; /* maximum code length */
1660 int h; /* table level */
1661 register unsigned i; /* counter, current code */
1662 register unsigned j; /* counter */
1663 register int k; /* number of bits in current code */
1664 int l; /* bits per table (returned in m) */
1665 register unsigned *p; /* pointer into c[], b[], or v[] */
1666 register struct huft *q; /* points to current table */
1667 struct huft r; /* table entry for structure assignment */
1668 struct huft *u[BMAX]; /* table stack */
1669 unsigned v[N_MAX]; /* values in order of bit length */
1670 register int w; /* bits before this table == (l * h) */
1671 unsigned x[BMAX + 1]; /* bit offsets, then code stack */
1672 unsigned *xp; /* pointer into x */
1673 int y; /* number of dummy codes added */
1674 unsigned z; /* number of entries in current table */
1677 /* Generate counts for each bit length */
1678 memzero(c, sizeof(c));
1685 && n - i <= '~' ? "%c %d\n" : "0x%x %d\n"), n - i, *p));
1686 c[*p]++; /* assume all entries <= BMAX */
1687 p++; /* Can't combine with above line (Solaris bug) */
1689 if (c[0] == n) { /* null input--all zero length codes */
1690 *t = (struct huft *) NULL;
1696 /* Find minimum and maximum length, bound *m by those */
1698 for (j = 1; j <= BMAX; j++)
1701 k = j; /* minimum code length */
1702 if ((unsigned) l < j)
1704 for (i = BMAX; i; i--)
1707 g = i; /* maximum code length */
1708 if ((unsigned) l > i)
1713 /* Adjust last length count to fill out codes, if needed */
1714 for (y = 1 << j; j < i; j++, y <<= 1)
1715 if ((y -= c[j]) < 0)
1716 return 2; /* bad input: more codes than bits */
1717 if ((y -= c[i]) < 0)
1722 /* Generate starting offsets into the value table for each length */
1726 while (--i) { /* note that i == g from above */
1727 *xp++ = (j += *p++);
1731 /* Make a table of values in order of bit lengths */
1735 if ((j = *p++) != 0)
1740 /* Generate the Huffman codes and for each, make the table entries */
1741 x[0] = i = 0; /* first Huffman code is zero */
1742 p = v; /* grab values in bit order */
1743 h = -1; /* no tables yet--level -1 */
1744 w = -l; /* bits decoded == (l * h) */
1745 u[0] = (struct huft *) NULL; /* just to keep compilers happy */
1746 q = (struct huft *) NULL; /* ditto */
1749 /* go through the bit lengths (k already is bits in shortest code) */
1750 for (; k <= g; k++) {
1753 /* here i is the Huffman code of length k bits for value *p */
1754 /* make tables up to required level */
1757 w += l; /* previous table always l bits */
1759 /* compute minimum size table less than or equal to l bits */
1760 z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */
1761 if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */
1762 f -= a + 1; /* deduct codes from patterns left */
1764 while (++j < z) { /* try smaller tables up to z bits */
1765 if ((f <<= 1) <= *++xp)
1766 break; /* enough codes to use up j bits */
1767 f -= *xp; /* else deduct codes from patterns */
1770 z = 1 << j; /* table entries for j-bit table */
1772 /* allocate and link in new table */
1775 (struct huft *) malloc((z + 1) *
1776 sizeof(struct huft))) ==
1777 (struct huft *) NULL) {
1780 return 3; /* not enough memory */
1782 hufts += z + 1; /* track memory usage */
1783 *t = q + 1; /* link to list for huft_free() */
1784 *(t = &(q->v.t)) = (struct huft *) NULL;
1785 u[h] = ++q; /* table starts after link */
1787 /* connect to last table, if there is one */
1789 x[h] = i; /* save pattern for backing up */
1790 r.b = (uch) l; /* bits to dump before this table */
1791 r.e = (uch) (16 + j); /* bits in this table */
1792 r.v.t = q; /* pointer to this table */
1793 j = i >> (w - l); /* (get around Turbo C bug) */
1794 u[h - 1][j] = r; /* connect to last table */
1798 /* set up table entry in r */
1799 r.b = (uch) (k - w);
1801 r.e = 99; /* out of values--invalid code */
1803 r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */
1804 r.v.n = (ush) (*p); /* simple code is just the value */
1805 p++; /* one compiler does not like *p++ */
1807 r.e = (uch) e[*p - s]; /* non-simple--look up in lists */
1808 r.v.n = d[*p++ - s];
1811 /* fill code-like entries with r */
1813 for (j = i >> w; j < z; j += f)
1816 /* backwards increment the k-bit code i */
1817 for (j = 1 << (k - 1); i & j; j >>= 1)
1821 /* backup over finished tables */
1822 while ((i & ((1 << w) - 1)) != x[h]) {
1823 h--; /* don't need to update q */
1830 /* Return true (1) if we were given an incomplete table */
1831 return y != 0 && g != 1;
1837 struct huft *t; /* table to free */
1839 /* Free the malloc'ed tables built by huft_build(), which makes a linked
1840 list of the tables it made, with the links in a dummy first entry of
1843 register struct huft *p, *q;
1846 /* Go through linked list, freeing from the malloced (t[-1]) address. */
1848 while (p != (struct huft *) NULL) {
1857 int inflate_codes(tl, td, bl, bd)
1858 struct huft *tl, *td; /* literal/length and distance decoder tables */
1859 int bl, bd; /* number of bits decoded by tl[] and td[] */
1861 /* inflate (decompress) the codes in a deflated (compressed) block.
1862 Return an error code or zero if it all goes ok. */
1864 register unsigned e; /* table entry flag/number of extra bits */
1865 unsigned n, d; /* length and index for copy */
1866 unsigned w; /* current window position */
1867 struct huft *t; /* pointer to table entry */
1868 unsigned ml, md; /* masks for bl and bd bits */
1869 register ulg b; /* bit buffer */
1870 register unsigned k; /* number of bits in bit buffer */
1873 /* make local copies of globals */
1874 b = bb; /* initialize bit buffer */
1876 w = wp; /* initialize window position */
1878 /* inflate the coded data */
1879 ml = mask_bits[bl]; /* precompute masks for speed */
1881 for (;;) { /* do until end of block */
1882 NEEDBITS((unsigned) bl)
1883 if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
1890 } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e)
1893 if (e == 16) { /* then it's a literal */
1894 slide[w++] = (uch) t->v.n;
1895 Tracevv((stderr, "%c", slide[w - 1]));
1900 } else { /* it's an EOB or a length */
1902 /* exit if end of block */
1906 /* get length of block to copy */
1908 n = t->v.n + ((unsigned) b & mask_bits[e]);
1911 /* decode distance of block to copy */
1912 NEEDBITS((unsigned) bd)
1913 if ((e = (t = td + ((unsigned) b & md))->e) > 16)
1924 t->v.t + ((unsigned) b & mask_bits[e]))->e) >
1928 d = w - t->v.n - ((unsigned) b & mask_bits[e]);
1930 Tracevv((stderr, "\\[%d,%d]", w - d, n));
1936 WSIZE - ((d &= WSIZE - 1) > w ? d : w)) >
1938 #if !defined(NOMEMCPY) && !defined(DEBUG)
1939 if (w - d >= e) { /* (this test assumes unsigned comparison) */
1940 memcpy(slide + w, slide + d, e);
1943 } else /* do it slow to avoid memcpy() overlap */
1944 #endif /* !NOMEMCPY */
1946 slide[w++] = slide[d++];
1947 Tracevv((stderr, "%c", slide[w - 1]));
1958 /* restore the globals from the locals */
1959 wp = w; /* restore global window pointer */
1960 bb = b; /* restore global bit buffer */
1969 int inflate_stored()
1970 /* "decompress" an inflated type 0 (stored) block. */
1972 unsigned n; /* number of bytes in block */
1973 unsigned w; /* current window position */
1974 register ulg b; /* bit buffer */
1975 register unsigned k; /* number of bits in bit buffer */
1978 /* make local copies of globals */
1979 b = bb; /* initialize bit buffer */
1981 w = wp; /* initialize window position */
1984 /* go to byte boundary */
1989 /* get the length and its complement */
1991 n = ((unsigned) b & 0xffff);
1994 if (n != (unsigned) ((~b) & 0xffff))
1995 return 1; /* error in compressed data */
1999 /* read and output the compressed data */
2002 slide[w++] = (uch) b;
2011 /* restore the globals from the locals */
2012 wp = w; /* restore global window pointer */
2013 bb = b; /* restore global bit buffer */
2021 /* decompress an inflated type 1 (fixed Huffman codes) block. We should
2022 either replace this with a custom decoder, or at least precompute the
2025 int i; /* temporary variable */
2026 struct huft *tl; /* literal/length code table */
2027 struct huft *td; /* distance code table */
2028 int bl; /* lookup bits for tl */
2029 int bd; /* lookup bits for td */
2030 unsigned l[288]; /* length list for huft_build */
2033 /* set up literal table */
2034 for (i = 0; i < 144; i++)
2036 for (; i < 256; i++)
2038 for (; i < 280; i++)
2040 for (; i < 288; i++) /* make a complete, but wrong code set */
2043 if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0)
2047 /* set up distance table */
2048 for (i = 0; i < 30; i++) /* make an incomplete code set */
2051 if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) {
2057 /* decompress until an end-of-block code */
2058 if (inflate_codes(tl, td, bl, bd))
2062 /* free the decoding tables, return */
2070 int inflate_dynamic()
2071 /* decompress an inflated type 2 (dynamic Huffman codes) block. */
2073 int i; /* temporary variables */
2075 unsigned l; /* last length */
2076 unsigned m; /* mask for bit lengths table */
2077 unsigned n; /* number of lengths to get */
2078 struct huft *tl; /* literal/length code table */
2079 struct huft *td; /* distance code table */
2080 int bl; /* lookup bits for tl */
2081 int bd; /* lookup bits for td */
2082 unsigned nb; /* number of bit length codes */
2083 unsigned nl; /* number of literal/length codes */
2084 unsigned nd; /* number of distance codes */
2086 #ifdef PKZIP_BUG_WORKAROUND
2087 unsigned ll[288 + 32]; /* literal/length and distance code lengths */
2089 unsigned ll[286 + 30]; /* literal/length and distance code lengths */
2091 register ulg b; /* bit buffer */
2092 register unsigned k; /* number of bits in bit buffer */
2095 /* make local bit buffer */
2100 /* read in table lengths */
2102 nl = 257 + ((unsigned) b & 0x1f); /* number of literal/length codes */
2105 nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */
2108 nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */
2110 #ifdef PKZIP_BUG_WORKAROUND
2111 if (nl > 288 || nd > 32)
2113 if (nl > 286 || nd > 30)
2115 return 1; /* bad lengths */
2118 /* read in bit-length-code lengths */
2119 for (j = 0; j < nb; j++) {
2121 ll[border[j]] = (unsigned) b & 7;
2128 /* build decoding table for trees--single level, 7 bit lookup */
2130 if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) {
2133 return i; /* incomplete code set */
2137 /* read in literal and distance code lengths */
2141 while ((unsigned) i < n) {
2142 NEEDBITS((unsigned) bl)
2143 j = (td = tl + ((unsigned) b & m))->b;
2146 if (j < 16) /* length of code in bits (0..15) */
2147 ll[i++] = l = j; /* save last length in l */
2148 else if (j == 16) { /* repeat last length 3 to 6 times */
2150 j = 3 + ((unsigned) b & 3);
2152 if ((unsigned) i + j > n)
2156 } else if (j == 17) { /* 3 to 10 zero length codes */
2158 j = 3 + ((unsigned) b & 7);
2160 if ((unsigned) i + j > n)
2165 } else { /* j == 18: 11 to 138 zero length codes */
2168 j = 11 + ((unsigned) b & 0x7f);
2170 if ((unsigned) i + j > n)
2179 /* free decoding table for trees */
2183 /* restore the global bit buffer */
2188 /* build the decoding tables for literal/length and distance codes */
2190 if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
2192 fprintf(stderr, " incomplete literal tree\n");
2195 return i; /* incomplete code set */
2198 if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) {
2200 fprintf(stderr, " incomplete distance tree\n");
2201 #ifdef PKZIP_BUG_WORKAROUND
2208 return i; /* incomplete code set */
2213 /* decompress until an end-of-block code */
2214 if (inflate_codes(tl, td, bl, bd))
2218 /* free the decoding tables, return */
2226 int inflate_block(e)
2227 int *e; /* last block flag */
2229 /* decompress an inflated block */
2231 unsigned t; /* block type */
2232 register ulg b; /* bit buffer */
2233 register unsigned k; /* number of bits in bit buffer */
2236 /* make local bit buffer */
2241 /* read in last block bit */
2247 /* read in block type */
2249 t = (unsigned) b & 3;
2253 /* restore the global bit buffer */
2258 /* inflate that block type */
2260 return inflate_dynamic();
2262 return inflate_stored();
2264 return inflate_fixed();
2267 /* bad block type */
2274 /* decompress an inflated entry */
2276 int e; /* last block flag */
2277 int r; /* result code */
2278 unsigned h; /* maximum struct huft's malloc'ed */
2281 /* initialize window, bit buffer */
2287 /* decompress until the last block */
2291 if ((r = inflate_block(&e)) != 0)
2297 /* Undo too much lookahead. The next read will be byte aligned so we
2298 * can discard unused bits in the last meaningful byte.
2305 /* flush out slide */
2309 /* return success */
2311 fprintf(stderr, "<%u> ", h);