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-rw-r--r--gunzip.c2083
1 files changed, 632 insertions, 1451 deletions
diff --git a/gunzip.c b/gunzip.c
index ee86930..7a360a6 100644
--- a/gunzip.c
+++ b/gunzip.c
@@ -2,7 +2,7 @@
/*
* Gzip implementation for busybox
*
- * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly.
+ * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
*
* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
* based on gzip sources
@@ -25,24 +25,8 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- */
-
-#include "busybox.h"
-#include <getopt.h>
-
-/* 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
-
-#define BB_DECLARE_EXTERN
-#define bb_need_memory_exhausted
-#define bb_need_name_too_long
-#include "messages.c"
-
-
-/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
+ *
+ * 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.
* Portions of the lzw code are derived from the public domain 'compress'
@@ -73,246 +57,59 @@ static char *license_msg[] = {
};
#endif
-/* Compress files with zip algorithm and 'compress' interface.
- * See usage() and help() functions below for all options.
- * Outputs:
- * file.gz: compressed file with same mode, owner, and utimes
- * or stdout with -c option or if stdin used as input.
- * If the output file name had to be truncated, the original name is kept
- * in the compressed file.
- * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
- *
- * Using gz on MSDOS would create too many file name conflicts. For
- * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
- * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
- * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
- * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
- *
- * For the meaning of all compilation flags, see comments in Makefile.in.
- */
-
+#include "busybox.h"
+#include <getopt.h>
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
-
-/* #include "tailor.h" */
-
-/* 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
- * terms of the GNU General Public License, see the file COPYING.
- */
-
-/* The target dependent definitions should be defined here only.
- * The target dependent functions should be defined in tailor.c.
- */
-
-#define RECORD_IO 0
-
-#define get_char() get_byte()
-#define put_char(c) put_byte(c)
-
-
-/* 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 ((void *)(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
-
-#ifndef RETSIGTYPE
-# define RETSIGTYPE void
-#endif
-
-#define local static
+#include <string.h>
+#include <memory.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <time.h>
+#include <dirent.h>
+#define BB_DECLARE_EXTERN
+#define bb_need_memory_exhausted
+#define bb_need_name_too_long
+#include "messages.c"
-typedef unsigned char uch;
-typedef unsigned short ush;
-typedef unsigned long ulg;
+#define RECORD_IO 0
/* Return codes from gzip */
#define OK 0
#define ERROR 1
#define WARNING 2
-/* Compression methods (see algorithm.doc) */
-#define DEFLATED 8
-
-extern int method; /* compression method */
-
-/* To save memory for 16 bit systems, some arrays are overlaid between
- * the various modules:
- * deflate: prev+head window d_buf l_buf outbuf
- * unlzw: tab_prefix tab_suffix stack inbuf outbuf
- * inflate: window inbuf
- * unpack: window inbuf prefix_len
- * unlzh: left+right window c_table inbuf c_len
- * For compression, input is done in window[]. For decompression, output
- * is done in window except for unlzw.
- */
-
-#ifndef INBUFSIZ
-# ifdef SMALL_MEM
-# define INBUFSIZ 0x2000 /* input buffer size */
-# else
-# define INBUFSIZ 0x8000 /* input buffer size */
-# endif
-#endif
-#define INBUF_EXTRA 64 /* required by unlzw() */
-
-#ifndef OUTBUFSIZ
-# ifdef SMALL_MEM
-# define OUTBUFSIZ 8192 /* output buffer size */
-# else
-# define OUTBUFSIZ 16384 /* output buffer size */
-# endif
-#endif
-#define OUTBUF_EXTRA 2048 /* required by unlzw() */
-
-#define SMALL_MEM
-
-#ifndef DIST_BUFSIZE
-# ifdef SMALL_MEM
-# define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
-# else
-# define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
-# endif
-#endif
-
-/*#define DYN_ALLOC*/
-
-#ifdef DYN_ALLOC
-# define EXTERN(type, array) extern type * array
-# define DECLARE(type, array, size) type * array
-# define ALLOC(type, array, size) { \
- array = (type*)calloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
- if (array == NULL) errorMsg(memory_exhausted); \
- }
-# 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 ALLOC(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) */
-#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) */
-#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 */
-#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 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 DEFLATED 8
+#define INBUFSIZ 0x2000 /* input buffer size */
+#define INBUF_EXTRA 64 /* required by unlzw() */
+#define OUTBUFSIZ 8192 /* output buffer size */
+#define OUTBUF_EXTRA 2048 /* required by unlzw() */
+#define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
-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 */
-
-
-#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
+#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
/* 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 */
-
-#ifndef WSIZE
-# 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
-/* The minimum and maximum match lengths */
-
-#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
-/* Minimum amount of lookahead, except at the end of the input file.
- * See deflate.c for comments about the MIN_MATCH+1.
- */
+#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 WSIZE 0x8000 /* window size--must be a power of two, and */
+ /* at least 32K for zip's deflate method */
-#define MAX_DIST (WSIZE-MIN_LOOKAHEAD)
-/* In order to simplify the code, particularly on 16 bit machines, match
- * distances are limited to MAX_DIST instead of WSIZE.
- */
-
-extern int exit_code; /* program exit code */
-extern int verbose; /* be verbose (-v) */
-extern int level; /* compression level */
-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_byte is used for the compressed output, put_ubyte for the
- * uncompressed output. However unlzw() uses window for its
- * suffix table instead of its output buffer, so it does not use put_ubyte
- * (to be cleaned up).
- */
-#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
- flush_outbuf();}
-#define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
- flush_window();}
-
-/* Output a 16 bit value, lsb first */
-#define put_short(w) \
-{ if (outcnt < OUTBUFSIZ-2) { \
- outbuf[outcnt++] = (uch) ((w) & 0xff); \
- outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
- } else { \
- put_byte((uch)((w) & 0xff)); \
- put_byte((uch)((ush)(w) >> 8)); \
- } \
-}
-
-/* Output a 32 bit value to the bit stream, lsb first */
-#define put_long(n) { \
- put_short((n) & 0xffff); \
- put_short(((ulg)(n)) >> 16); \
-}
+/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
+#define BMAX 16 /* maximum bit length of any code (16 for explode) */
+#define N_MAX 288 /* maximum number of codes in any set */
-#define seekable() 0 /* force sequential output */
-#define translate_eol 0 /* no option -a yet */
+/* PKZIP header definitions */
+#define LOCSIG 0x04034b50L /* four-byte lead-in (lsb first) */
+#define LOCCRC 14 /* offset of crc */
+#define LOCLEN 22 /* offset of uncompressed length */
+#define EXTHDR 16 /* size of extended local header, inc sig */
-#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))
-#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
+#define BITS 16
/* Diagnostic functions */
#ifdef DEBUG
@@ -331,175 +128,6 @@ extern int save_orig_name; /* set if original name must be saved */
# define Tracecv(c,x)
#endif
-#define WARN(msg) {fprintf msg ; \
- if (exit_code == OK) exit_code = WARNING;}
-
- /* in unzip.c */
-extern int unzip (int in, int out);
-
- /* in gzip.c */
-RETSIGTYPE abort_gzip (void);
-
- /* in deflate.c */
-void lm_init (int pack_level, ush * flags);
-ulg deflate (void);
-
- /* 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 (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);
-
- /* in util.c: */
-extern ulg updcrc (uch * s, unsigned n);
-extern void clear_bufs (void);
-static int fill_inbuf (int eof_ok);
-extern void flush_outbuf (void);
-static void flush_window (void);
-extern void write_buf (int fd, void * buf, unsigned cnt);
-
-void read_error_msg (void);
-void write_error_msg (void);
-
- /* in inflate.c */
-static int inflate (void);
-
-/* #include "lzw.h" */
-
-/* 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
- * terms of the GNU General Public License, see the file COPYING.
- */
-
-#if !defined(OF) && defined(lint)
-# include "gzip.h"
-#endif
-
-#ifndef BITS
-# define BITS 16
-#endif
-#define INIT_BITS 9 /* Initial number of bits per code */
-
-#define LZW_MAGIC "\037\235" /* Magic header for lzw files, 1F 9D */
-
-#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
- * would just crash on the new format instead of giving a meaningful
- * error message. It does check the number of bits, but it's more
- * helpful to say "unsupported format, get a new version" than
- * "can only handle 16 bits".
- */
-
-#define BLOCK_MODE 0x80
-/* Block compression: if table is full and compression rate is dropping,
- * clear the dictionary.
- */
-
-#define LZW_RESERVED 0x60 /* reserved bits */
-
-#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 lzw (int in, int out);
-extern int unlzw (int in, int out);
-
-
-/* #include "revision.h" */
-
-/* revision.h -- define the version number
- * 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.
- */
-
-#define VERSION "1.2.4"
-#define PATCHLEVEL 0
-#define REVDATE "18 Aug 93"
-
-/* This version does not support compression into old compress format: */
-#ifdef LZW
-# undef LZW
-#endif
-
-#include <time.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
-#if defined(DIRENT)
-# include <dirent.h>
-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;
-
-# define DIR_OPT "SYSDIR"
-# else
-# ifdef SYSNDIR
-# include <sys/ndir.h>
-typedef struct direct dir_type;
-
-# define DIR_OPT "SYSNDIR"
-# else
-# ifdef NDIR
-# include <ndir.h>
-typedef struct direct dir_type;
-
-# define DIR_OPT "NDIR"
-# else
-# define NO_DIR
-# define DIR_OPT "NO_DIR"
-# endif
-# endif
-# endif
-#endif
-#if !defined(S_ISDIR) && defined(S_IFDIR)
-# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
-#endif
-#if !defined(S_ISREG) && defined(S_IFREG)
-# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
-#endif
-typedef RETSIGTYPE(*sig_type) (int);
-
-#ifndef O_BINARY
-# define O_BINARY 0 /* creation mode for open() */
-#endif
-
-#ifndef O_CREAT
- /* Pure BSD system? */
-# include <sys/file.h>
-# ifndef O_CREAT
-# define O_CREAT FCREAT
-# endif
-# ifndef O_EXCL
-# define O_EXCL FEXCL
-# endif
-#endif
-
-#ifndef S_IRUSR
-# define S_IRUSR 0400
-#endif
-#ifndef S_IWUSR
-# define S_IWUSR 0200
-#endif
-#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
-
#ifndef MAX_PATH_LEN /* max pathname length */
# ifdef BUFSIZ
# define MAX_PATH_LEN BUFSIZ
@@ -508,241 +136,139 @@ typedef RETSIGTYPE(*sig_type) (int);
# endif
#endif
-#ifndef SEEK_END
-# define SEEK_END 2
-#endif
+#define NEXTBYTE() (uch)get_byte()
+#define NEEDBITS(n) {while(k<(n)){b|=((ulg)NEXTBYTE())<<k;k+=8;}}
+#define DUMPBITS(n) {b>>=(n);k-=(n);}
-#ifdef NO_OFF_T
-typedef long off_t;
-off_t lseek (int fd, off_t offset, int whence);
-#endif
+#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
+/* Macros for getting two-byte and four-byte header values */
+#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
+#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
- /* global buffers */
+ /* in gzip.c */
+void abort_gzip (void);
+typedef void (*sig_type) (int);
-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);
-#else
-DECLARE(ush, tab_prefix0, 1L << (BITS - 1));
-DECLARE(ush, tab_prefix1, 1L << (BITS - 1));
-#endif
+typedef unsigned char uch;
+typedef unsigned short ush;
+typedef unsigned long ulg;
+typedef int file_t; /* Do not use stdio */
- /* local variables */
+uch *inbuf;
+uch *outbuf;
+ush *d_buf;
+uch *window;
+ush *tab_prefix0;
+ush *tab_prefix1;
+
+/* local variables */
+int test_mode = 0; /* check file integrity option */
+int foreground; /* set if program run in foreground */
+int maxbits = BITS; /* max bits per code for LZW */
+int method = DEFLATED; /* compression method */
+int exit_code = OK; /* program exit code */
+int last_member; /* set for .zip and .Z files */
+int part_nb; /* number of parts in .gz file */
+long ifile_size; /* input file size, -1 for devices (debug only) */
+long bytes_in; /* number of input bytes */
+long bytes_out; /* number of output bytes */
+long total_in = 0; /* input bytes for all files */
+long total_out = 0; /* output bytes for all files */
+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 */
+
+unsigned hufts; /* track memory usage */
+ulg bb; /* bit buffer */
+unsigned bk; /* bits in bit buffer */
+int crc_table_empty = 1;
-int test_mode = 0; /* check file integrity option */
-int foreground; /* set if program run in foreground */
-int maxbits = BITS; /* max bits per code for LZW */
-int method = DEFLATED; /* compression method */
-int exit_code = OK; /* program exit code */
-int last_member; /* set for .zip and .Z files */
-int part_nb; /* number of parts in .gz file */
-long ifile_size; /* input file size, -1 for devices (debug only) */
+struct huft {
+ uch e; /* number of extra bits or operation */
+ uch b; /* number of bits in this code or subcode */
+ union {
+ ush n; /* literal, length base, or distance base */
+ struct huft *t; /* pointer to next level of table */
+ } v;
+};
-long bytes_in; /* number of input bytes */
-long bytes_out; /* number of output bytes */
-long total_in = 0; /* input bytes for all files */
-long total_out = 0; /* output bytes for all files */
-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 */
+/* Tables for deflate from PKZIP's appnote.txt. */
+static unsigned border[] = { /* Order of the bit length code lengths */
+ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
+};
+static ush cplens[] = { /* Copy lengths for literal codes 257..285 */
+ 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
+ 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
+};
-long header_bytes; /* number of bytes in gzip header */
+/* note: see note #13 above about the 258 in this list. */
+static ush cplext[] = { /* Extra bits for literal codes 257..285 */
+ 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, 99, 99
+}; /* 99==invalid */
-/* local functions */
+static ush cpdist[] = { /* Copy offsets for distance codes 0..29 */
+ 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
+ 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
+ 8193, 12289, 16385, 24577
+};
-local int get_method (int in);
+static ush cpdext[] = { /* Extra bits for distance codes */
+ 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
+};
-#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
+ush mask_bits[] = {
+ 0x0000,
+ 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
+ 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
+};
-/* ======================================================================== */
-int gunzip_main(int argc, char **argv)
+/* ========================================================================
+ * Error handlers.
+ */
+void read_error_msg()
{
- int file_count; /* number of files to precess */
- int tostdout = 0;
- int fromstdin = 0;
- int result;
- int inFileNum;
- int outFileNum;
- int delInputFile = 0;
- int force = 0;
- struct stat statBuf;
- char *delFileName;
- char ifname[MAX_PATH_LEN + 1]; /* input file name */
- char ofname[MAX_PATH_LEN + 1]; /* output file name */
-
- if (strcmp(applet_name, "zcat") == 0) {
- force = 1;
- tostdout = 1;
- }
-
- /* Parse any options */
- while (--argc > 0 && **(++argv) == '-') {
- if (*((*argv) + 1) == '\0') {
- tostdout = 1;
- }
- while (*(++(*argv))) {
- switch (**argv) {
- case 'c':
- tostdout = 1;
- break;
- case 't':
- test_mode = 1;
- break;
- case 'f':
- force = 1;
- break;
- default:
- usage(gunzip_usage);
- }
- }
- }
-
- if (argc <= 0) {
- tostdout = 1;
- fromstdin = 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);
- }
-#endif
-#ifdef SIGHUP
- if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
- (void) signal(SIGHUP, (sig_type) abort_gzip);
- }
-#endif
-
- file_count = argc - optind;
-
- /* 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);
-#else
- ALLOC(ush, tab_prefix0, 1L << (BITS - 1));
- ALLOC(ush, tab_prefix1, 1L << (BITS - 1));
-#endif
-
- if (fromstdin == 1) {
- strcpy(ofname, "stdin");
-
- inFileNum = fileno(stdin);
- ifile_size = -1L; /* convention for unknown size */
+ fprintf(stderr, "\n");
+ if (errno != 0) {
+ perror("");
} else {
- /* Open up the input file */
- if (argc <= 0)
- usage(gunzip_usage);
- if (strlen(*argv) > MAX_PATH_LEN) {
- errorMsg(name_too_long);
- exit(WARNING);
- }
- strcpy(ifname, *argv);
-
- /* 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);
- }
- ifile_size = statBuf.st_size;
+ fprintf(stderr, "unexpected end of file\n");
}
+ abort_gzip();
+}
- if (tostdout == 1) {
- /* And get to work */
- strcpy(ofname, "stdout");
- outFileNum = fileno(stdout);
-
- clear_bufs(); /* clear input and output buffers */
- part_nb = 0;
-
- /* Actually do the compression/decompression. */
- unzip(inFileNum, outFileNum);
-
- } else if (test_mode) {
- /* Actually do the compression/decompression. */
- unzip(inFileNum, 2);
- } else {
- char *pos;
-
- /* And get to work */
- if (strlen(ifname) > MAX_PATH_LEN - 4) {
- errorMsg(name_too_long);
- exit(WARNING);
- }
- strcpy(ofname, ifname);
- pos = strstr(ofname, ".gz");
- if (pos != NULL) {
- *pos = '\0';
- delInputFile = 1;
- } else {
- pos = strstr(ofname, ".tgz");
- if (pos != NULL) {
- *pos = '\0';
- strcat(pos, ".tar");
- delInputFile = 1;
- }
- }
-
- /* Open output fille */
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
- outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
-#else
- outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL);
-#endif
- if (outFileNum < 0) {
- perror(ofname);
- exit(WARNING);
- }
- /* 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 = unzip(inFileNum, outFileNum);
+/* ===========================================================================
+ * Fill the input buffer. This is called only when the buffer is empty.
+ */
+int fill_inbuf(eof_ok)
+int eof_ok; /* set if EOF acceptable as a result */
+{
+ int len;
- close(outFileNum);
- close(inFileNum);
- /* Delete the original file */
- if (result == OK)
- delFileName = ifname;
- else
- delFileName = ofname;
+ /* Read as much as possible */
+ insize = 0;
+ errno = 0;
+ do {
+ len = read(ifd, (char *) inbuf + insize, INBUFSIZ - insize);
+ if (len == 0 || len == EOF)
+ break;
+ insize += len;
+ } while (insize < INBUFSIZ);
- if (delInputFile == 1 && unlink(delFileName) < 0) {
- perror(delFileName);
- exit(FALSE);
- }
+ if (insize == 0) {
+ if (eof_ok)
+ return EOF;
+ read_error_msg();
}
- return(exit_code);
+ bytes_in += (ulg) insize;
+ inptr = 1;
+ return inbuf[0];
}
@@ -757,17 +283,17 @@ int gunzip_main(int argc, char **argv)
* IN assertions: there is at least one remaining compressed member.
* If the member is a zip file, it must be the only one.
*/
-local int get_method(in)
-int in; /* input file descriptor */
+static int get_method(in)
+int in; /* input file descriptor */
{
- uch flags; /* compression flags */
- char magic[2]; /* magic header */
+ uch flags; /* compression flags */
+ char magic[2]; /* magic header */
+ long header_bytes = 0; /* number of bytes in gzip header */
magic[0] = (char) get_byte();
magic[1] = (char) get_byte();
- method = -1; /* unknown yet */
- part_nb++; /* number of parts in gzip file */
- header_bytes = 0;
+ method = -1; /* unknown yet */
+ part_nb++; /* number of parts in gzip file */
last_member = RECORD_IO;
/* assume multiple members in gzip file except for record oriented I/O */
@@ -775,8 +301,7 @@ int in; /* input file descriptor */
method = (int) get_byte();
if (method != DEFLATED) {
- errorMsg("unknown method %d -- get newer version of gzip\n",
- method);
+ errorMsg("unknown method %d -- get newer version of gzip\n", method);
exit_code = ERROR;
return -1;
}
@@ -792,22 +317,19 @@ int in; /* input file descriptor */
if ((flags & EXTRA_FIELD) != 0) {
unsigned len = (unsigned) get_byte();
-
len |= ((unsigned) get_byte()) << 8;
-
while (len--)
(void) get_byte();
}
/* Discard original name if any */
if ((flags & ORIG_NAME) != 0) {
- while (get_char() != 0) /* null */
- ;
+ while (get_byte() != 0); /* null */
}
/* Discard file comment if any */
if ((flags & COMMENT) != 0) {
- while (get_char() != 0) /* null */
+ while (get_byte() != 0) /* null */
;
}
if (part_nb == 1) {
@@ -824,7 +346,9 @@ int in; /* input file descriptor */
exit_code = ERROR;
return -1;
} else {
- WARN((stderr, "\ndecompression OK, trailing garbage ignored\n"));
+ fprintf(stderr, "\ndecompression OK, trailing garbage ignored\n");
+ if (exit_code == OK)
+ exit_code = WARNING;
return -2;
}
}
@@ -832,184 +356,49 @@ int in; /* input file descriptor */
/* ========================================================================
* Signal and error handler.
*/
-RETSIGTYPE abort_gzip()
+void abort_gzip()
{
exit(ERROR);
}
-/* unzip.c -- decompress files in gzip or pkzip format.
- * 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.
- *
- * The code in this file is derived from the file funzip.c written
- * and put in the public domain by Mark Adler.
- */
-
-/*
- This version can extract files in gzip or pkzip format.
- For the latter, only the first entry is extracted, and it has to be
- either deflated or stored.
- */
-
-/* #include "crypt.h" */
-
-/* crypt.h (dummy version) -- do not perform encryption
- * Hardly worth copyrighting :-)
- */
-
-#ifdef CRYPT
-# undef CRYPT /* dummy version */
-#endif
-
-#define RAND_HEAD_LEN 12 /* length of encryption random header */
-
-#define zencode
-#define zdecode
-
-/* PKZIP header definitions */
-#define LOCSIG 0x04034b50L /* four-byte lead-in (lsb first) */
-#define LOCFLG 6 /* offset of bit flag */
-#define CRPFLG 1 /* bit for encrypted entry */
-#define EXTFLG 8 /* bit for extended local header */
-#define LOCHOW 8 /* offset of compression method */
-#define LOCTIM 10 /* file mod time (for decryption) */
-#define LOCCRC 14 /* offset of crc */
-#define LOCSIZ 18 /* offset of compressed size */
-#define LOCLEN 22 /* offset of uncompressed length */
-#define LOCFIL 26 /* offset of file name field length */
-#define LOCEXT 28 /* offset of extra field length */
-#define LOCHDR 30 /* size of local header, including sig */
-#define EXTHDR 16 /* size of extended local header, inc sig */
-
-
-/* Globals */
-
-char *key; /* not used--needed to link crypt.c */
-int pkzip = 0; /* set for a pkzip file */
-int ext_header = 0; /* set if extended local header */
-
-/* ===========================================================================
- * Unzip in to out. This routine works on both gzip and pkzip files.
- *
- * IN assertions: the buffer inbuf contains already the beginning of
- * the compressed data, from offsets inptr to insize-1 included.
- * The magic header has already been checked. The output buffer is cleared.
- */
-int unzip(in, out)
-int in, out; /* input and output file descriptors */
-{
- ulg orig_crc = 0; /* original crc */
- ulg orig_len = 0; /* original uncompressed length */
- int n;
- uch buf[EXTHDR]; /* extended local header */
-
- ifd = in;
- ofd = out;
- method = get_method(ifd);
- if (method < 0) {
- exit(exit_code); /* error message already emitted */
- }
-
- updcrc(NULL, 0); /* initialize crc */
-
- if (pkzip && !ext_header) { /* crc and length at the end otherwise */
- orig_crc = LG(inbuf + LOCCRC);
- orig_len = LG(inbuf + LOCLEN);
- }
-
- /* Decompress */
- if (method == DEFLATED) {
-
- int res = inflate();
-
- if (res == 3) {
- errorMsg(memory_exhausted);
- } else if (res != 0) {
- errorMsg("invalid compressed data--format violated");
- }
-
- } else {
- errorMsg("internal error, invalid method");
- }
-
- /* Get the crc and original length */
- if (!pkzip) {
- /* crc32 (see algorithm.doc)
- * uncompressed input size modulo 2^32
- */
- for (n = 0; n < 8; n++) {
- buf[n] = (uch) get_byte(); /* may cause an error if EOF */
- }
- orig_crc = LG(buf);
- orig_len = LG(buf + 4);
-
- } else if (ext_header) { /* If extended header, check it */
- /* signature - 4bytes: 0x50 0x4b 0x07 0x08
- * CRC-32 value
- * compressed size 4-bytes
- * uncompressed size 4-bytes
- */
- for (n = 0; n < EXTHDR; n++) {
- buf[n] = (uch) get_byte(); /* may cause an error if EOF */
- }
- orig_crc = LG(buf + 4);
- orig_len = LG(buf + 12);
- }
-
- /* Validate decompression */
- if (orig_crc != updcrc(outbuf, 0)) {
- errorMsg("invalid compressed data--crc error");
- }
- if (orig_len != (ulg) bytes_out) {
- errorMsg("invalid compressed data--length error");
- }
-
- /* Check if there are more entries in a pkzip file */
- if (pkzip && inptr + 4 < insize && LG(inbuf + inptr) == LOCSIG) {
- WARN((stderr, "has more than one entry--rest ignored\n"));
- }
- ext_header = pkzip = 0; /* for next file */
- return OK;
-}
-
-/* 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.
- */
-
-#include <ctype.h>
-#include <errno.h>
-#include <sys/types.h>
-
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif
-#ifndef NO_FCNTL_H
-# include <fcntl.h>
-#endif
-
-#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
-# include <stdlib.h>
-#else
-extern int errno;
-#endif
-
-static const ulg crc_32_tab[]; /* crc table, defined below */
-
/* ===========================================================================
* Run a set of bytes through the crc shift register. If s is a NULL
* pointer, then initialize the crc shift register contents instead.
* Return the current crc in either case.
*/
ulg updcrc(s, n)
-uch *s; /* pointer to bytes to pump through */
-unsigned n; /* number of bytes in s[] */
+uch *s; /* pointer to bytes to pump through */
+unsigned n; /* number of bytes in s[] */
{
- register ulg c; /* temporary variable */
-
static ulg crc = (ulg) 0xffffffffL; /* shift register contents */
+ register ulg c; /* temporary variable */
+ static unsigned long crc_32_tab[256];
+ if (crc_table_empty) {
+ unsigned long c; /* crc shift register */
+ unsigned long e; /* polynomial exclusive-or pattern */
+ int i; /* counter for all possible eight bit values */
+ int k; /* byte being shifted into crc apparatus */
+
+ /* terms of polynomial defining this crc (except x^32): */
+ static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
+
+ /* Make exclusive-or pattern from polynomial (0xedb88320) */
+ e = 0;
+ for (i = 0; i < sizeof(p)/sizeof(int); i++)
+ e |= 1L << (31 - p[i]);
+
+ /* Compute and print table of CRC's, five per line */
+ crc_32_tab[0] = 0x00000000L;
+ for (i = 1; i < 256; i++) {
+ c = i;
+ /* The idea to initialize the register with the byte instead of
+ * zero was stolen from Haruhiko Okumura's ar002
+ */
+ for (k = 8; k; k--)
+ c = c & 1 ? (c >> 1) ^ e : c >> 1;
+ crc_32_tab[i]=c;
+ }
+ }
if (s == NULL) {
c = 0xffffffffL;
@@ -1024,57 +413,31 @@ unsigned n; /* number of bytes in s[] */
return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
}
-/* ===========================================================================
- * Clear input and output buffers
- */
-void clear_bufs(void)
+void write_error_msg()
{
- outcnt = 0;
- insize = inptr = 0;
- bytes_in = bytes_out = 0L;
+ fprintf(stderr, "\n");
+ perror("");
+ abort_gzip();
}
/* ===========================================================================
- * Fill the input buffer. This is called only when the buffer is empty.
+ * Does the same as write(), but also handles partial pipe writes and checks
+ * for error return.
*/
-int fill_inbuf(eof_ok)
-int eof_ok; /* set if EOF acceptable as a result */
+void write_buf(fd, buf, cnt)
+int fd;
+void * buf;
+unsigned cnt;
{
- int len;
-
- /* Read as much as possible */
- insize = 0;
- errno = 0;
- do {
- len = read(ifd, (char *) inbuf + insize, INBUFSIZ - insize);
- if (len == 0 || len == EOF)
- break;
- insize += len;
- } while (insize < INBUFSIZ);
+ unsigned n;
- if (insize == 0) {
- if (eof_ok)
- return EOF;
- read_error_msg();
+ while ((n = write(fd, buf, cnt)) != cnt) {
+ if (n == (unsigned) (-1)) {
+ write_error_msg();
+ }
+ cnt -= n;
+ buf = (void *) ((char *) buf + n);
}
- bytes_in += (ulg) insize;
- inptr = 1;
- return inbuf[0];
-}
-
-/* ===========================================================================
- * 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;
-
- if (!test_mode)
- write_buf(ofd, (char *) outbuf, outcnt);
- bytes_out += (ulg) outcnt;
- outcnt = 0;
}
/* ===========================================================================
@@ -1093,440 +456,80 @@ void flush_window()
outcnt = 0;
}
-/* ===========================================================================
- * Does the same as write(), but also handles partial pipe writes and checks
- * for error return.
- */
-void write_buf(fd, buf, cnt)
-int fd;
-void * buf;
-unsigned cnt;
+int inflate_stored()
+/* "decompress" an inflated type 0 (stored) block. */
{
- unsigned n;
-
- while ((n = write(fd, buf, cnt)) != cnt) {
- if (n == (unsigned) (-1)) {
- write_error_msg();
- }
- cnt -= n;
- buf = (void *) ((char *) buf + n);
- }
-}
-
-#if defined(NO_STRING_H) && !defined(STDC_HEADERS)
-
-/* Provide missing strspn and strcspn functions. */
+ unsigned n; /* number of bytes in block */
+ unsigned w; /* current window position */
+ register ulg b; /* bit buffer */
+ register unsigned k; /* number of bits in bit buffer */
-# ifndef __STDC__
-# define const
-# endif
+ /* make local copies of globals */
+ b = bb; /* initialize bit buffer */
+ k = bk;
+ w = outcnt; /* initialize window position */
-int strspn (const char *s, const char *accept);
-int strcspn (const char *s, const char *reject);
+ /* go to byte boundary */
+ n = k & 7;
+ DUMPBITS(n);
-/* ========================================================================
- * 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;
-{
- register const char *p;
- register const char *a;
- register int count = 0;
+ /* get the length and its complement */
+ NEEDBITS(16)
+ n = ((unsigned) b & 0xffff);
+ DUMPBITS(16)
+ NEEDBITS(16)
+ if (n != (unsigned) ((~b) & 0xffff))
+ return 1; /* error in compressed data */
+ DUMPBITS(16)
- for (p = s; *p != '\0'; ++p) {
- for (a = accept; *a != '\0'; ++a) {
- if (*p == *a)
- break;
+ /* read and output the compressed data */
+ while (n--) {
+ NEEDBITS(8)
+ window[w++] = (uch) b;
+ if (w == WSIZE) {
+// flush_output(w);
+ outcnt=(w),
+ flush_window();
+ w = 0;
}
- if (*a == '\0')
- return count;
- ++count;
+ DUMPBITS(8)
}
- return count;
-}
-/* ========================================================================
- * Return the length of the maximum inital segment of s
- * which contains no characters from reject.
- */
-int strcspn(s, reject)
-const char *s;
-const char *reject;
-{
- register int count = 0;
-
- while (*s != '\0') {
- if (strchr(reject, *s++) != NULL)
- return count;
- ++count;
- }
- return count;
+ /* restore the globals from the locals */
+ outcnt = w; /* restore global window pointer */
+ bb = b; /* restore global bit buffer */
+ bk = k;
+ return 0;
}
-#endif /* NO_STRING_H */
-
+int huft_free(t)
+struct huft *t; /* table to free */
-/* ========================================================================
- * Error handlers.
- */
-void read_error_msg()
+/* Free the malloc'ed tables built by huft_build(), which makes a linked
+ list of the tables it made, with the links in a dummy first entry of
+ each table. */
{
- fprintf(stderr, "\n");
- if (errno != 0) {
- perror("");
- } else {
- fprintf(stderr, "unexpected end of file\n");
- }
- abort_gzip();
-}
+ register struct huft *p, *q;
-void write_error_msg()
-{
- fprintf(stderr, "\n");
- perror("");
- abort_gzip();
+ /* Go through linked list, freeing from the malloced (t[-1]) address. */
+ p = t;
+ while (p != (struct huft *) NULL) {
+ q = (--p)->v.t;
+ free((char *) p);
+ p = q;
+ }
+ return 0;
}
-/* ========================================================================
- * Table of CRC-32's of all single-byte values (made by makecrc.c)
- */
-static const ulg crc_32_tab[] = {
- 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
- 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
- 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
- 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
- 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
- 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
- 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
- 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
- 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
- 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
- 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
- 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
- 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
- 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
- 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
- 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
- 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
- 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
- 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
- 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
- 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
- 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
- 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
- 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
- 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
- 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
- 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
- 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
- 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
- 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
- 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
- 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
- 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
- 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
- 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
- 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
- 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
- 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
- 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
- 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
- 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
- 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
- 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
- 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
- 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
- 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
- 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
- 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
- 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
- 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
- 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
- 0x2d02ef8dL
-};
-
-/* inflate.c -- Not copyrighted 1992 by Mark Adler
- version c10p1, 10 January 1993 */
-
-/* You can do whatever you like with this source file, though I would
- prefer that if you modify it and redistribute it that you include
- comments to that effect with your name and the date. Thank you.
- [The history has been moved to the file ChangeLog.]
- */
-
-/*
- Inflate deflated (PKZIP's method 8 compressed) data. The compression
- method searches for as much of the current string of bytes (up to a
- length of 258) in the previous 32K bytes. If it doesn't find any
- matches (of at least length 3), it codes the next byte. Otherwise, it
- codes the length of the matched string and its distance backwards from
- the current position. There is a single Huffman code that codes both
- single bytes (called "literals") and match lengths. A second Huffman
- code codes the distance information, which follows a length code. Each
- length or distance code actually represents a base value and a number
- of "extra" (sometimes zero) bits to get to add to the base value. At
- the end of each deflated block is a special end-of-block (EOB) literal/
- length code. The decoding process is basically: get a literal/length
- code; if EOB then done; if a literal, emit the decoded byte; if a
- length then get the distance and emit the referred-to bytes from the
- sliding window of previously emitted data.
-
- There are (currently) three kinds of inflate blocks: stored, fixed, and
- dynamic. The compressor deals with some chunk of data at a time, and
- decides which method to use on a chunk-by-chunk basis. A chunk might
- typically be 32K or 64K. If the chunk is uncompressible, then the
- "stored" method is used. In this case, the bytes are simply stored as
- is, eight bits per byte, with none of the above coding. The bytes are
- preceded by a count, since there is no longer an EOB code.
-
- If the data is compressible, then either the fixed or dynamic methods
- are used. In the dynamic method, the compressed data is preceded by
- an encoding of the literal/length and distance Huffman codes that are
- to be used to decode this block. The representation is itself Huffman
- coded, and so is preceded by a description of that code. These code
- descriptions take up a little space, and so for small blocks, there is
- a predefined set of codes, called the fixed codes. The fixed method is
- used if the block codes up smaller that way (usually for quite small
- chunks), otherwise the dynamic method is used. In the latter case, the
- codes are customized to the probabilities in the current block, and so
- can code it much better than the pre-determined fixed codes.
-
- The Huffman codes themselves are decoded using a mutli-level table
- lookup, in order to maximize the speed of decoding plus the speed of
- building the decoding tables. See the comments below that precede the
- lbits and dbits tuning parameters.
- */
-
-
-/*
- Notes beyond the 1.93a appnote.txt:
-
- 1. Distance pointers never point before the beginning of the output
- stream.
- 2. Distance pointers can point back across blocks, up to 32k away.
- 3. There is an implied maximum of 7 bits for the bit length table and
- 15 bits for the actual data.
- 4. If only one code exists, then it is encoded using one bit. (Zero
- would be more efficient, but perhaps a little confusing.) If two
- codes exist, they are coded using one bit each (0 and 1).
- 5. There is no way of sending zero distance codes--a dummy must be
- sent if there are none. (History: a pre 2.0 version of PKZIP would
- store blocks with no distance codes, but this was discovered to be
- too harsh a criterion.) Valid only for 1.93a. 2.04c does allow
- zero distance codes, which is sent as one code of zero bits in
- length.
- 6. There are up to 286 literal/length codes. Code 256 represents the
- end-of-block. Note however that the static length tree defines
- 288 codes just to fill out the Huffman codes. Codes 286 and 287
- cannot be used though, since there is no length base or extra bits
- defined for them. Similarly, there are up to 30 distance codes.
- However, static trees define 32 codes (all 5 bits) to fill out the
- Huffman codes, but the last two had better not show up in the data.
- 7. Unzip can check dynamic Huffman blocks for complete code sets.
- The exception is that a single code would not be complete (see #4).
- 8. The five bits following the block type is really the number of
- literal codes sent minus 257.
- 9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits
- (1+6+6). Therefore, to output three times the length, you output
- three codes (1+1+1), whereas to output four times the same length,
- you only need two codes (1+3). Hmm.
- 10. In the tree reconstruction algorithm, Code = Code + Increment
- only if BitLength(i) is not zero. (Pretty obvious.)
- 11. Correction: 4 Bits: # of Bit Length codes - 4 (4 - 19)
- 12. Note: length code 284 can represent 227-258, but length code 285
- really is 258. The last length deserves its own, short code
- since it gets used a lot in very redundant files. The length
- 258 is special since 258 - 3 (the min match length) is 255.
- 13. The literal/length and distance code bit lengths are read as a
- single stream of lengths. It is possible (and advantageous) for
- a repeat code (16, 17, or 18) to go across the boundary between
- the two sets of lengths.
- */
-
-#include <sys/types.h>
-
-#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
-# include <stdlib.h>
-#endif
-
-
-#define slide window
-
-/* Huffman code lookup table entry--this entry is four bytes for machines
- that have 16-bit pointers (e.g. PC's in the small or medium model).
- Valid extra bits are 0..13. e == 15 is EOB (end of block), e == 16
- means that v is a literal, 16 < e < 32 means that v is a pointer to
- the next table, which codes e - 16 bits, and lastly e == 99 indicates
- an unused code. If a code with e == 99 is looked up, this implies an
- error in the data. */
-struct huft {
- uch e; /* number of extra bits or operation */
- uch b; /* number of bits in this code or subcode */
- union {
- ush n; /* literal, length base, or distance base */
- struct huft *t; /* pointer to next level of table */
- } v;
-};
-
-
-/* Function prototypes */
-int huft_build (unsigned *, unsigned, unsigned, ush *, ush *,
- struct huft **, int *);
-int huft_free (struct huft *);
-int inflate_codes (struct huft *, struct huft *, int, int);
-int inflate_stored (void);
-int inflate_fixed (void);
-int inflate_dynamic (void);
-int inflate_block (int *);
-int inflate (void);
-
-
-/* The inflate algorithm uses a sliding 32K byte window on the uncompressed
- stream to find repeated byte strings. This is implemented here as a
- circular buffer. The index is updated simply by incrementing and then
- and'ing with 0x7fff (32K-1). */
-/* It is left to other modules to supply the 32K area. It is assumed
- to be usable as if it were declared "uch slide[32768];" or as just
- "uch *slide;" and then malloc'ed in the latter case. The definition
- must be in unzip.h, included above. */
-/* unsigned wp; current position in slide */
-#define wp outcnt
-#define flush_output(w) (wp=(w),flush_window())
-
-/* Tables for deflate from PKZIP's appnote.txt. */
-static unsigned border[] = { /* Order of the bit length code lengths */
- 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
-};
-static ush cplens[] = { /* Copy lengths for literal codes 257..285 */
- 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
- 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
-};
-
- /* note: see note #13 above about the 258 in this list. */
-static ush cplext[] = { /* Extra bits for literal codes 257..285 */
- 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, 99, 99
-}; /* 99==invalid */
-static ush cpdist[] = { /* Copy offsets for distance codes 0..29 */
- 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
- 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
- 8193, 12289, 16385, 24577
-};
-static ush cpdext[] = { /* Extra bits for distance codes */
- 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
-};
-
-
-
-/* Macros for inflate() bit peeking and grabbing.
- The usage is:
-
- NEEDBITS(j)
- x = b & mask_bits[j];
- DUMPBITS(j)
-
- where NEEDBITS makes sure that b has at least j bits in it, and
- DUMPBITS removes the bits from b. The macros use the variable k
- for the number of bits in b. Normally, b and k are register
- variables for speed, and are initialized at the beginning of a
- routine that uses these macros from a global bit buffer and count.
-
- If we assume that EOB will be the longest code, then we will never
- ask for bits with NEEDBITS that are beyond the end of the stream.
- So, NEEDBITS should not read any more bytes than are needed to
- meet the request. Then no bytes need to be "returned" to the buffer
- at the end of the last block.
-
- However, this assumption is not true for fixed blocks--the EOB code
- is 7 bits, but the other literal/length codes can be 8 or 9 bits.
- (The EOB code is shorter than other codes because fixed blocks are
- generally short. So, while a block always has an EOB, many other
- literal/length codes have a significantly lower probability of
- showing up at all.) However, by making the first table have a
- lookup of seven bits, the EOB code will be found in that first
- lookup, and so will not require that too many bits be pulled from
- the stream.
- */
-
-ulg bb; /* bit buffer */
-unsigned bk; /* bits in bit buffer */
-
-ush mask_bits[] = {
- 0x0000,
- 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
- 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
-};
-
-#ifdef CRYPT
-uch cc;
-
-# define NEXTBYTE() (cc = get_byte(), zdecode(cc), cc)
-#else
-# define NEXTBYTE() (uch)get_byte()
-#endif
-#define NEEDBITS(n) {while(k<(n)){b|=((ulg)NEXTBYTE())<<k;k+=8;}}
-#define DUMPBITS(n) {b>>=(n);k-=(n);}
-
-
-/*
- Huffman code decoding is performed using a multi-level table lookup.
- The fastest way to decode is to simply build a lookup table whose
- size is determined by the longest code. However, the time it takes
- to build this table can also be a factor if the data being decoded
- is not very long. The most common codes are necessarily the
- shortest codes, so those codes dominate the decoding time, and hence
- the speed. The idea is you can have a shorter table that decodes the
- shorter, more probable codes, and then point to subsidiary tables for
- the longer codes. The time it costs to decode the longer codes is
- then traded against the time it takes to make longer tables.
-
- This results of this trade are in the variables lbits and dbits
- below. lbits is the number of bits the first level table for literal/
- length codes can decode in one step, and dbits is the same thing for
- the distance codes. Subsequent tables are also less than or equal to
- those sizes. These values may be adjusted either when all of the
- codes are shorter than that, in which case the longest code length in
- bits is used, or when the shortest code is *longer* than the requested
- table size, in which case the length of the shortest code in bits is
- used.
-
- There are two different values for the two tables, since they code a
- different number of possibilities each. The literal/length table
- codes 286 possible values, or in a flat code, a little over eight
- bits. The distance table codes 30 possible values, or a little less
- than five bits, flat. The optimum values for speed end up being
- about one bit more than those, so lbits is 8+1 and dbits is 5+1.
- The optimum values may differ though from machine to machine, and
- possibly even between compilers. Your mileage may vary.
- */
-
-
-int lbits = 9; /* bits in base literal/length lookup table */
-int dbits = 6; /* bits in base distance lookup table */
-
-
-/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
-#define BMAX 16 /* maximum bit length of any code (16 for explode) */
-#define N_MAX 288 /* maximum number of codes in any set */
-
-
-unsigned hufts; /* track memory usage */
-
-
int huft_build(b, n, s, d, e, t, m)
-unsigned *b; /* code lengths in bits (all assumed <= BMAX) */
-unsigned n; /* number of codes (assumed <= N_MAX) */
-unsigned s; /* number of simple-valued codes (0..s-1) */
-ush *d; /* list of base values for non-simple codes */
-ush *e; /* list of extra bits for non-simple codes */
-struct huft **t; /* result: starting table */
-int *m; /* maximum lookup bits, returns actual */
+unsigned *b; /* code lengths in bits (all assumed <= BMAX) */
+unsigned n; /* number of codes (assumed <= N_MAX) */
+unsigned s; /* number of simple-valued codes (0..s-1) */
+ush *d; /* list of base values for non-simple codes */
+ush *e; /* list of extra bits for non-simple codes */
+struct huft **t; /* result: starting table */
+int *m; /* maximum lookup bits, returns actual */
/* Given a list of code lengths and a maximum table size, make a set of
tables to decode that set of codes. Return zero on success, one if
@@ -1534,81 +537,73 @@ int *m; /* maximum lookup bits, returns actual */
case), two if the input is invalid (all zero length codes or an
oversubscribed set of lengths), and three if not enough memory. */
{
- unsigned a; /* counter for codes of length k */
- unsigned c[BMAX + 1]; /* bit length count table */
- unsigned f; /* i repeats in table every f entries */
- int g; /* maximum code length */
- int h; /* table level */
- register unsigned i; /* counter, current code */
- register unsigned j; /* counter */
- register int k; /* number of bits in current code */
- int l; /* bits per table (returned in m) */
+ unsigned a; /* counter for codes of length k */
+ unsigned c[BMAX + 1]; /* bit length count table */
+ unsigned f; /* i repeats in table every f entries */
+ int g; /* maximum code length */
+ int h; /* table level */
+ register unsigned i; /* counter, current code */
+ register unsigned j; /* counter */
+ register int k; /* number of bits in current code */
+ int l; /* bits per table (returned in m) */
register unsigned *p; /* pointer into c[], b[], or v[] */
register struct huft *q; /* points to current table */
- struct huft r; /* table entry for structure assignment */
- struct huft *u[BMAX]; /* table stack */
- unsigned v[N_MAX]; /* values in order of bit length */
- register int w; /* bits before this table == (l * h) */
- unsigned x[BMAX + 1]; /* bit offsets, then code stack */
- unsigned *xp; /* pointer into x */
- int y; /* number of dummy codes added */
- unsigned z; /* number of entries in current table */
-
+ struct huft r; /* table entry for structure assignment */
+ struct huft *u[BMAX]; /* table stack */
+ unsigned v[N_MAX]; /* values in order of bit length */
+ register int w; /* bits before this table == (l * h) */
+ unsigned x[BMAX + 1]; /* bit offsets, then code stack */
+ unsigned *xp; /* pointer into x */
+ int y; /* number of dummy codes added */
+ unsigned z; /* number of entries in current table */
/* Generate counts for each bit length */
- memzero(c, sizeof(c));
+ memset ((void *)(c), 0, sizeof(c));
p = b;
i = n;
do {
- Tracecv(*p,
- (stderr,
- (n - i >= ' '
- && n - i <= '~' ? "%c %d\n" : "0x%x %d\n"), n - i, *p));
- c[*p]++; /* assume all entries <= BMAX */
- p++; /* Can't combine with above line (Solaris bug) */
+ Tracecv(*p,(stderr, (n - i >= ' ' && n - i <= '~' ? "%c %d\n" : "0x%x %d\n"), n - i, *p));
+ c[*p]++; /* assume all entries <= BMAX */
+ p++; /* Can't combine with above line (Solaris bug) */
} while (--i);
- if (c[0] == n) { /* null input--all zero length codes */
+ if (c[0] == n) { /* null input--all zero length codes */
*t = (struct huft *) NULL;
*m = 0;
return 0;
}
-
/* Find minimum and maximum length, bound *m by those */
l = *m;
for (j = 1; j <= BMAX; j++)
if (c[j])
break;
- k = j; /* minimum code length */
+ k = j; /* minimum code length */
if ((unsigned) l < j)
l = j;
for (i = BMAX; i; i--)
if (c[i])
break;
- g = i; /* maximum code length */
+ g = i; /* maximum code length */
if ((unsigned) l > i)
l = i;
*m = l;
-
/* Adjust last length count to fill out codes, if needed */
for (y = 1 << j; j < i; j++, y <<= 1)
if ((y -= c[j]) < 0)
- return 2; /* bad input: more codes than bits */
+ return 2; /* bad input: more codes than bits */
if ((y -= c[i]) < 0)
return 2;
c[i] += y;
-
/* Generate starting offsets into the value table for each length */
x[1] = j = 0;
p = c + 1;
xp = x + 2;
- while (--i) { /* note that i == g from above */
+ while (--i) { /* note that i == g from above */
*xp++ = (j += *p++);
}
-
/* Make a table of values in order of bit lengths */
p = b;
i = 0;
@@ -1617,15 +612,14 @@ int *m; /* maximum lookup bits, returns actual */
v[x[j]++] = i;
} while (++i < n);
-
/* Generate the Huffman codes and for each, make the table entries */
- x[0] = i = 0; /* first Huffman code is zero */
- p = v; /* grab values in bit order */
- h = -1; /* no tables yet--level -1 */
- w = -l; /* bits decoded == (l * h) */
+ x[0] = i = 0; /* first Huffman code is zero */
+ p = v; /* grab values in bit order */
+ h = -1; /* no tables yet--level -1 */
+ w = -l; /* bits decoded == (l * h) */
u[0] = (struct huft *) NULL; /* just to keep compilers happy */
q = (struct huft *) NULL; /* ditto */
- z = 0; /* ditto */
+ z = 0; /* ditto */
/* go through the bit lengths (k already is bits in shortest code) */
for (; k <= g; k++) {
@@ -1635,7 +629,7 @@ int *m; /* maximum lookup bits, returns actual */
/* make tables up to required level */
while (k > w + l) {
h++;
- w += l; /* previous table always l bits */
+ w += l; /* previous table always l bits */
/* compute minimum size table less than or equal to l bits */
z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */
@@ -1706,35 +700,11 @@ int *m; /* maximum lookup bits, returns actual */
}
}
}
-
-
/* Return true (1) if we were given an incomplete table */
return y != 0 && g != 1;
}
-
-int huft_free(t)
-struct huft *t; /* table to free */
-
-/* Free the malloc'ed tables built by huft_build(), which makes a linked
- list of the tables it made, with the links in a dummy first entry of
- each table. */
-{
- register struct huft *p, *q;
-
-
- /* Go through linked list, freeing from the malloced (t[-1]) address. */
- p = t;
- while (p != (struct huft *) NULL) {
- q = (--p)->v.t;
- free((char *) p);
- p = q;
- }
- return 0;
-}
-
-
int inflate_codes(tl, td, bl, bd)
struct huft *tl, *td; /* literal/length and distance decoder tables */
int bl, bd; /* number of bits decoded by tl[] and td[] */
@@ -1744,22 +714,21 @@ int bl, bd; /* number of bits decoded by tl[] and td[] */
{
register unsigned e; /* table entry flag/number of extra bits */
unsigned n, d; /* length and index for copy */
- unsigned w; /* current window position */
+ unsigned w; /* current window position */
struct huft *t; /* pointer to table entry */
unsigned ml, md; /* masks for bl and bd bits */
register ulg b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
-
/* make local copies of globals */
- b = bb; /* initialize bit buffer */
+ b = bb; /* initialize bit buffer */
k = bk;
- w = wp; /* initialize window position */
+ w = outcnt; /* initialize window position */
/* inflate the coded data */
ml = mask_bits[bl]; /* precompute masks for speed */
md = mask_bits[bd];
- for (;;) { /* do until end of block */
+ for (;;) { /* do until end of block */
NEEDBITS((unsigned) bl)
if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
do {
@@ -1772,10 +741,12 @@ int bl, bd; /* number of bits decoded by tl[] and td[] */
> 16);
DUMPBITS(t->b)
if (e == 16) { /* then it's a literal */
- slide[w++] = (uch) t->v.n;
- Tracevv((stderr, "%c", slide[w - 1]));
+ window[w++] = (uch) t->v.n;
+ Tracevv((stderr, "%c", window[w - 1]));
if (w == WSIZE) {
- flush_output(w);
+// flush_output(w);
+ outcnt=(w),
+ flush_window();
w = 0;
}
} else { /* it's an EOB or a length */
@@ -1818,86 +789,34 @@ int bl, bd; /* number of bits decoded by tl[] and td[] */
n ? n : e);
#if !defined(NOMEMCPY) && !defined(DEBUG)
if (w - d >= e) { /* (this test assumes unsigned comparison) */
- memcpy(slide + w, slide + d, e);
+ memcpy(window + w, window + d, e);
w += e;
d += e;
} else /* do it slow to avoid memcpy() overlap */
#endif /* !NOMEMCPY */
do {
- slide[w++] = slide[d++];
- Tracevv((stderr, "%c", slide[w - 1]));
+ window[w++] = window[d++];
+ Tracevv((stderr, "%c", window[w - 1]));
} while (--e);
if (w == WSIZE) {
- flush_output(w);
+// flush_output(w);
+ outcnt=(w),
+ flush_window();
w = 0;
}
} while (n);
}
}
-
/* restore the globals from the locals */
- wp = w; /* restore global window pointer */
- bb = b; /* restore global bit buffer */
+ outcnt = w; /* restore global window pointer */
+ bb = b; /* restore global bit buffer */
bk = k;
/* done */
return 0;
}
-
-
-int inflate_stored()
-/* "decompress" an inflated type 0 (stored) block. */
-{
- unsigned n; /* number of bytes in block */
- unsigned w; /* current window position */
- register ulg b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
-
-
- /* make local copies of globals */
- b = bb; /* initialize bit buffer */
- k = bk;
- w = wp; /* initialize window position */
-
-
- /* go to byte boundary */
- n = k & 7;
- DUMPBITS(n);
-
-
- /* get the length and its complement */
- NEEDBITS(16)
- n = ((unsigned) b & 0xffff);
- DUMPBITS(16)
- NEEDBITS(16)
- if (n != (unsigned) ((~b) & 0xffff))
- return 1; /* error in compressed data */
- DUMPBITS(16)
-
-
- /* read and output the compressed data */
- while (n--) {
- NEEDBITS(8)
- slide[w++] = (uch) b;
- if (w == WSIZE) {
- flush_output(w);
- w = 0;
- }
- DUMPBITS(8)
- }
-
-
- /* restore the globals from the locals */
- wp = w; /* restore global window pointer */
- bb = b; /* restore global bit buffer */
- bk = k;
- return 0;
-}
-
-
-
int inflate_fixed()
/* decompress an inflated type 1 (fixed Huffman codes) block. We should
either replace this with a custom decoder, or at least precompute the
@@ -1910,7 +829,6 @@ int inflate_fixed()
int bd; /* lookup bits for td */
unsigned l[288]; /* length list for huft_build */
-
/* set up literal table */
for (i = 0; i < 144; i++)
l[i] = 8;
@@ -1924,7 +842,6 @@ int inflate_fixed()
if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0)
return i;
-
/* set up distance table */
for (i = 0; i < 30; i++) /* make an incomplete code set */
l[i] = 5;
@@ -1934,23 +851,22 @@ int inflate_fixed()
return i;
}
-
/* decompress until an end-of-block code */
if (inflate_codes(tl, td, bl, bd))
return 1;
-
/* free the decoding tables, return */
huft_free(tl);
huft_free(td);
return 0;
}
-
-
int inflate_dynamic()
/* decompress an inflated type 2 (dynamic Huffman codes) block. */
{
+ int dbits = 6; /* bits in base distance lookup table */
+ int lbits = 9; /* bits in base literal/length lookup table */
+
int i; /* temporary variables */
unsigned j;
unsigned l; /* last length */
@@ -1972,12 +888,10 @@ int inflate_dynamic()
register ulg b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
-
/* make local bit buffer */
b = bb;
k = bk;
-
/* read in table lengths */
NEEDBITS(5)
nl = 257 + ((unsigned) b & 0x1f); /* number of literal/length codes */
@@ -1995,7 +909,6 @@ int inflate_dynamic()
#endif
return 1; /* bad lengths */
-
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
NEEDBITS(3)
@@ -2005,16 +918,14 @@ int inflate_dynamic()
for (; j < 19; j++)
ll[border[j]] = 0;
-
/* build decoding table for trees--single level, 7 bit lookup */
bl = 7;
if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) {
if (i == 1)
huft_free(tl);
- return i; /* incomplete code set */
+ return i; /* incomplete code set */
}
-
/* read in literal and distance code lengths */
n = nl + nd;
m = mask_bits[bl];
@@ -2024,7 +935,7 @@ int inflate_dynamic()
j = (td = tl + ((unsigned) b & m))->b;
DUMPBITS(j)
j = td->v.n;
- if (j < 16) /* length of code in bits (0..15) */
+ if (j < 16) /* length of code in bits (0..15) */
ll[i++] = l = j; /* save last length in l */
else if (j == 16) { /* repeat last length 3 to 6 times */
NEEDBITS(2)
@@ -2043,7 +954,7 @@ int inflate_dynamic()
while (j--)
ll[i++] = 0;
l = 0;
- } else { /* j == 18: 11 to 138 zero length codes */
+ } else { /* j == 18: 11 to 138 zero length codes */
NEEDBITS(7)
j = 11 + ((unsigned) b & 0x7f);
@@ -2056,16 +967,13 @@ int inflate_dynamic()
}
}
-
/* free decoding table for trees */
huft_free(tl);
-
/* restore the global bit buffer */
bb = b;
bk = k;
-
/* build the decoding tables for literal/length and distance codes */
bl = lbits;
if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
@@ -2073,69 +981,54 @@ int inflate_dynamic()
fprintf(stderr, " incomplete literal tree\n");
huft_free(tl);
}
- return i; /* incomplete code set */
+ return i; /* incomplete code set */
}
bd = dbits;
if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) {
if (i == 1) {
fprintf(stderr, " incomplete distance tree\n");
-#ifdef PKZIP_BUG_WORKAROUND
- i = 0;
- }
-#else
huft_free(td);
}
huft_free(tl);
- return i; /* incomplete code set */
-#endif
+ return i; /* incomplete code set */
}
-
/* decompress until an end-of-block code */
if (inflate_codes(tl, td, bl, bd))
return 1;
-
/* free the decoding tables, return */
huft_free(tl);
huft_free(td);
return 0;
}
-
-
-int inflate_block(e)
-int *e; /* last block flag */
-
/* decompress an inflated block */
+int inflate_block(e)
+int *e; /* last block flag */
{
- unsigned t; /* block type */
- register ulg b; /* bit buffer */
+ unsigned t; /* block type */
+ register ulg b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
-
/* make local bit buffer */
b = bb;
k = bk;
-
/* read in last block bit */
NEEDBITS(1)
* e = (int) b & 1;
DUMPBITS(1)
-
/* read in block type */
NEEDBITS(2)
t = (unsigned) b & 3;
DUMPBITS(2)
-
/* restore the global bit buffer */
bb = b;
bk = k;
-
/* inflate that block type */
if (t == 2)
return inflate_dynamic();
@@ -2144,27 +1037,22 @@ int *e; /* last block flag */
if (t == 1)
return inflate_fixed();
-
/* bad block type */
return 2;
}
-
-
int inflate()
/* decompress an inflated entry */
{
- int e; /* last block flag */
- int r; /* result code */
- unsigned h; /* maximum struct huft's malloc'ed */
-
+ int e; /* last block flag */
+ int r; /* result code */
+ unsigned h; /* maximum struct huft's malloc'ed */
/* initialize window, bit buffer */
- wp = 0;
+ outcnt = 0;
bk = 0;
bb = 0;
-
/* decompress until the last block */
h = 0;
do {
@@ -2183,13 +1071,306 @@ int inflate()
inptr--;
}
- /* flush out slide */
- flush_output(wp);
-
-
+ /* flush out window */
+ outcnt=(outcnt),
+ flush_window();
/* return success */
#ifdef DEBUG
fprintf(stderr, "<%u> ", h);
#endif /* DEBUG */
return 0;
}
+
+/* ===========================================================================
+ * Unzip in to out. This routine works on both gzip and pkzip files.
+ *
+ * IN assertions: the buffer inbuf contains already the beginning of
+ * the compressed data, from offsets inptr to insize-1 included.
+ * The magic header has already been checked. The output buffer is cleared.
+ */
+int unzip(in, out)
+int in, out; /* input and output file descriptors */
+{
+ int ext_header = 0; /* set if extended local header */
+ int pkzip = 0; /* set for a pkzip file */
+ ulg orig_crc = 0; /* original crc */
+ ulg orig_len = 0; /* original uncompressed length */
+ int n;
+ uch buf[EXTHDR]; /* extended local header */
+
+ ifd = in;
+ ofd = out;
+ method = get_method(ifd);
+ if (method < 0) {
+ exit(exit_code); /* error message already emitted */
+ }
+
+ updcrc(NULL, 0); /* initialize crc */
+
+ if (pkzip && !ext_header) { /* crc and length at the end otherwise */
+ orig_crc = LG(inbuf + LOCCRC);
+ orig_len = LG(inbuf + LOCLEN);
+ }
+
+ /* Decompress */
+ if (method == DEFLATED) {
+
+ int res = inflate();
+
+ if (res == 3) {
+ errorMsg(memory_exhausted);
+ } else if (res != 0) {
+ errorMsg("invalid compressed data--format violated");
+ }
+
+ } else {
+ errorMsg("internal error, invalid method");
+ }
+
+ /* Get the crc and original length */
+ if (!pkzip) {
+ /* crc32 (see algorithm.doc)
+ * uncompressed input size modulo 2^32
+ */
+ for (n = 0; n < 8; n++) {
+ buf[n] = (uch) get_byte(); /* may cause an error if EOF */
+ }
+ orig_crc = LG(buf);
+ orig_len = LG(buf + 4);
+
+ } else if (ext_header) { /* If extended header, check it */
+ /* signature - 4bytes: 0x50 0x4b 0x07 0x08
+ * CRC-32 value
+ * compressed size 4-bytes
+ * uncompressed size 4-bytes
+ */
+ for (n = 0; n < EXTHDR; n++) {
+ buf[n] = (uch) get_byte(); /* may cause an error if EOF */
+ }
+ orig_crc = LG(buf + 4);
+ orig_len = LG(buf + 12);
+ }
+
+ /* Validate decompression */
+ if (orig_crc != updcrc(outbuf, 0)) {
+ errorMsg("invalid compressed data--crc error");
+ }
+ if (orig_len != (ulg) bytes_out) {
+ errorMsg("invalid compressed data--length error");
+ }
+
+ /* Check if there are more entries in a pkzip file */
+ if (pkzip && inptr + 4 < insize && LG(inbuf + inptr) == LOCSIG) {
+ fprintf(stderr, "has more than one entry--rest ignored\n");
+ if (exit_code == OK)
+ exit_code = WARNING;
+ }
+ ext_header = pkzip = 0; /* for next file */
+ return OK;
+}
+
+
+/* ===========================================================================
+ * Clear input and output buffers
+ */
+void clear_bufs(void)
+{
+ outcnt = 0;
+ insize = inptr = 0;
+ bytes_in = bytes_out = 0L;
+}
+
+/* ===========================================================================
+ * 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;
+
+ if (!test_mode)
+ write_buf(ofd, (char *) outbuf, outcnt);
+ bytes_out += (ulg) outcnt;
+ outcnt = 0;
+}
+
+/* ======================================================================== */
+int gunzip_main(int argc, char **argv)
+{
+ int file_count; /* number of files to precess */
+ int tostdout = 0;
+ int fromstdin = 0;
+ int result;
+ int inFileNum;
+ int outFileNum;
+ int delInputFile = 0;
+ int force = 0;
+ struct stat statBuf;
+ char *delFileName;
+ char ifname[MAX_PATH_LEN + 1]; /* input file name */
+ char ofname[MAX_PATH_LEN + 1]; /* output file name */
+
+ if (strcmp(applet_name, "zcat") == 0) {
+ force = 1;
+ tostdout = 1;
+ }
+
+ /* Parse any options */
+ while (--argc > 0 && **(++argv) == '-') {
+ if (*((*argv) + 1) == '\0') {
+ tostdout = 1;
+ }
+ while (*(++(*argv))) {
+ switch (**argv) {
+ case 'c':
+ tostdout = 1;
+ break;
+ case 't':
+ test_mode = 1;
+ break;
+ case 'f':
+ force = 1;
+ break;
+ default:
+ usage(gunzip_usage);
+ }
+ }
+ }
+
+ if (argc <= 0) {
+ tostdout = 1;
+ fromstdin = 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);
+ }
+#endif
+#ifdef SIGHUP
+ if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
+ (void) signal(SIGHUP, (sig_type) abort_gzip);
+ }
+#endif
+
+ file_count = argc - optind;
+
+ /* Allocate all global buffers (for DYN_ALLOC option) */
+ inbuf = xmalloc((size_t)((INBUFSIZ+INBUF_EXTRA+1L)*sizeof(uch)));
+ outbuf = xmalloc((size_t)((OUTBUFSIZ+OUTBUF_EXTRA+1L)*sizeof(uch)));
+ d_buf = xmalloc((size_t)((DIST_BUFSIZE+1L)*sizeof(ush)));
+ window = xmalloc((size_t)(((2L*WSIZE)+1L)*sizeof(uch)));
+ tab_prefix0 = xmalloc((size_t)(((1L<<(BITS-1))+1L)*sizeof(ush)));
+ tab_prefix1 = xmalloc((size_t)(((1L<<(BITS-1))+1L)*sizeof(ush)));
+
+ if (fromstdin == 1) {
+ strcpy(ofname, "stdin");
+
+ inFileNum = fileno(stdin);
+ ifile_size = -1L; /* convention for unknown size */
+ } else {
+ /* Open up the input file */
+ if (argc <= 0)
+ usage(gunzip_usage);
+ if (strlen(*argv) > MAX_PATH_LEN) {
+ errorMsg(name_too_long);
+ exit(WARNING);
+ }
+ strcpy(ifname, *argv);
+
+ /* 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);
+ }
+ ifile_size = statBuf.st_size;
+ }
+
+ if (tostdout == 1) {
+ /* And get to work */
+ strcpy(ofname, "stdout");
+ outFileNum = fileno(stdout);
+
+ clear_bufs(); /* clear input and output buffers */
+ part_nb = 0;
+
+ /* Actually do the compression/decompression. */
+ unzip(inFileNum, outFileNum);
+
+ } else if (test_mode) {
+ /* Actually do the compression/decompression. */
+ unzip(inFileNum, 2);
+ } else {
+ char *pos;
+
+ /* And get to work */
+ if (strlen(ifname) > MAX_PATH_LEN - 4) {
+ errorMsg(name_too_long);
+ exit(WARNING);
+ }
+ strcpy(ofname, ifname);
+ pos = strstr(ofname, ".gz");
+ if (pos != NULL) {
+ *pos = '\0';
+ delInputFile = 1;
+ } else {
+ pos = strstr(ofname, ".tgz");
+ if (pos != NULL) {
+ *pos = '\0';
+ strcat(pos, ".tar");
+ delInputFile = 1;
+ }
+ }
+
+ /* Open output fille */
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+ outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
+#else
+ outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL);
+#endif
+ if (outFileNum < 0) {
+ perror(ofname);
+ exit(WARNING);
+ }
+ /* 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 = unzip(inFileNum, outFileNum);
+
+ close(outFileNum);
+ close(inFileNum);
+ /* Delete the original file */
+ if (result == OK)
+ delFileName = ifname;
+ else
+ delFileName = ofname;
+
+ if (delInputFile == 1 && unlink(delFileName) < 0) {
+ perror(delFileName);
+ exit(FALSE);
+ }
+ }
+ return(exit_code);
+}