diff --git a/archival/gunzip.c b/archival/gunzip.c index ee8693013..7a360a6ea 100644 --- a/archival/gunzip.c +++ b/archival/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 * 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 - -/* 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 #include #include #include #include - -/* #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. - */ +#include +#include +#include +#include +#include +#include +#include +#include +#define BB_DECLARE_EXTERN +#define bb_need_memory_exhausted +#define bb_need_name_too_long +#include "messages.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 -#if !defined(NO_STRING_H) || defined(STDC_HEADERS) -# include -# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__) -# include -# endif -# define memzero(s, n) memset ((void *)(s), 0, (n)) -#else -# include -# 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 - -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; - /* Return codes from gzip */ #define OK 0 #define ERROR 1 #define WARNING 2 -/* Compression methods (see algorithm.doc) */ -#define DEFLATED 8 +#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 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 */ - -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 */ +#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 */ -#ifndef WSIZE -# define WSIZE 0x8000 /* window size--must be a power of two, and */ -#endif /* at least 32K for zip's deflate method */ +/* 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 MIN_MATCH 3 -#define MAX_MATCH 258 -/* The minimum and maximum match lengths */ +/* 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 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 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); \ -} - -#define seekable() 0 /* force sequential output */ -#define translate_eol 0 /* no option -a yet */ - -#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */ - -/* 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 -#include -#include -#include -#if defined(DIRENT) -# include -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 -typedef struct direct dir_type; - -# define DIR_OPT "SYSDIR" -# else -# ifdef SYSNDIR -# include -typedef struct direct dir_type; - -# define DIR_OPT "SYSNDIR" -# else -# ifdef NDIR -# include -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 -# 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 @@ -508,58 +136,1064 @@ 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())<>=(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)) + + /* in gzip.c */ +void abort_gzip (void); +typedef void (*sig_type) (int); + +typedef unsigned char uch; +typedef unsigned short ush; +typedef unsigned long ulg; +typedef int file_t; /* Do not use stdio */ + +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; + +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; +}; + +/* 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 +}; + +ush mask_bits[] = { + 0x0000, + 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, + 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff +}; + +/* ======================================================================== + * Error handlers. + */ +void read_error_msg() +{ + fprintf(stderr, "\n"); + if (errno != 0) { + perror(""); + } else { + fprintf(stderr, "unexpected end of file\n"); + } + abort_gzip(); +} + +/* =========================================================================== + * 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; + + /* 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 (insize == 0) { + if (eof_ok) + return EOF; + read_error_msg(); + } + bytes_in += (ulg) insize; + inptr = 1; + return inbuf[0]; +} - /* global buffers */ +/* ======================================================================== + * Check the magic number of the input file and update ofname if an + * original name was given and tostdout is not set. + * Return the compression method, -1 for error, -2 for warning. + * Set inptr to the offset of the next byte to be processed. + * Updates time_stamp if there is one and --no-time is not used. + * This function may be called repeatedly for an input file consisting + * of several contiguous gzip'ed members. + * IN assertions: there is at least one remaining compressed member. + * If the member is a zip file, it must be the only one. + */ +static int get_method(in) +int in; /* input file descriptor */ +{ + uch flags; /* compression flags */ + char magic[2]; /* magic header */ + long header_bytes = 0; /* number of bytes in gzip header */ -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); + magic[0] = (char) get_byte(); + magic[1] = (char) get_byte(); + 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 */ + + if (memcmp(magic, GZIP_MAGIC, 2) == 0) { + + method = (int) get_byte(); + if (method != DEFLATED) { + errorMsg("unknown method %d -- get newer version of gzip\n", method); + exit_code = ERROR; + return -1; + } + flags = (uch) get_byte(); + + (ulg) get_byte(); /* Ignore time stamp */ + (ulg) get_byte(); + (ulg) get_byte(); + (ulg) get_byte(); + + (void) get_byte(); /* Ignore extra flags for the moment */ + (void) get_byte(); /* Ignore OS type for the moment */ + + 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_byte() != 0); /* null */ + } + + /* Discard file comment if any */ + if ((flags & COMMENT) != 0) { + while (get_byte() != 0) /* null */ + ; + } + if (part_nb == 1) { + header_bytes = inptr + 2 * sizeof(long); /* include crc and size */ + } + + } + + if (method >= 0) + return method; + + if (part_nb == 1) { + fprintf(stderr, "\nnot in gzip format\n"); + exit_code = ERROR; + return -1; + } else { + fprintf(stderr, "\ndecompression OK, trailing garbage ignored\n"); + if (exit_code == OK) + exit_code = WARNING; + return -2; + } +} + +/* ======================================================================== + * Signal and error handler. + */ +void abort_gzip() +{ + exit(ERROR); +} + +/* =========================================================================== + * 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[] */ +{ + 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; + } else { + c = crc; + if (n) + do { + c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8); + } while (--n); + } + crc = c; + return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ +} + +void write_error_msg() +{ + fprintf(stderr, "\n"); + perror(""); + abort_gzip(); +} + +/* =========================================================================== + * 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; +{ + unsigned n; + + while ((n = write(fd, buf, cnt)) != cnt) { + if (n == (unsigned) (-1)) { + write_error_msg(); + } + cnt -= n; + buf = (void *) ((char *) buf + n); + } +} + +/* =========================================================================== + * Write the output window window[0..outcnt-1] and update crc and bytes_out. + * (Used for the decompressed data only.) + */ +void flush_window() +{ + if (outcnt == 0) + return; + updcrc(window, outcnt); + + if (!test_mode) + write_buf(ofd, (char *) window, outcnt); + bytes_out += (ulg) outcnt; + outcnt = 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 = outcnt; /* 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) + window[w++] = (uch) b; + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + DUMPBITS(8) + } + + /* restore the globals from the locals */ + outcnt = w; /* restore global window pointer */ + bb = b; /* restore global bit buffer */ + bk = k; + return 0; +} + +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 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 */ + +/* 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 + the given code set is incomplete (the tables are still built in this + 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) */ + 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 */ + + /* Generate counts for each bit length */ + 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) */ + } while (--i); + 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 */ + if ((unsigned) l < j) + l = j; + for (i = BMAX; i; i--) + if (c[i]) + break; + 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 */ + 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 */ + *xp++ = (j += *p++); + } + + /* Make a table of values in order of bit lengths */ + p = b; + i = 0; + do { + if ((j = *p++) != 0) + 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) */ + u[0] = (struct huft *) NULL; /* just to keep compilers happy */ + q = (struct huft *) NULL; /* ditto */ + z = 0; /* ditto */ + + /* go through the bit lengths (k already is bits in shortest code) */ + for (; k <= g; k++) { + a = c[k]; + while (a--) { + /* here i is the Huffman code of length k bits for value *p */ + /* make tables up to required level */ + while (k > w + l) { + h++; + 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 */ + if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ + f -= a + 1; /* deduct codes from patterns left */ + xp = c + k; + while (++j < z) { /* try smaller tables up to z bits */ + if ((f <<= 1) <= *++xp) + break; /* enough codes to use up j bits */ + f -= *xp; /* else deduct codes from patterns */ + } + } + z = 1 << j; /* table entries for j-bit table */ + + /* allocate and link in new table */ + if ( + (q = + (struct huft *) malloc((z + 1) * + sizeof(struct huft))) == + (struct huft *) NULL) { + if (h) + huft_free(u[0]); + return 3; /* not enough memory */ + } + hufts += z + 1; /* track memory usage */ + *t = q + 1; /* link to list for huft_free() */ + *(t = &(q->v.t)) = (struct huft *) NULL; + u[h] = ++q; /* table starts after link */ + + /* connect to last table, if there is one */ + if (h) { + x[h] = i; /* save pattern for backing up */ + r.b = (uch) l; /* bits to dump before this table */ + r.e = (uch) (16 + j); /* bits in this table */ + r.v.t = q; /* pointer to this table */ + j = i >> (w - l); /* (get around Turbo C bug) */ + u[h - 1][j] = r; /* connect to last table */ + } + } + + /* set up table entry in r */ + r.b = (uch) (k - w); + if (p >= v + n) + r.e = 99; /* out of values--invalid code */ + else if (*p < s) { + r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ + r.v.n = (ush) (*p); /* simple code is just the value */ + p++; /* one compiler does not like *p++ */ + } else { + r.e = (uch) e[*p - s]; /* non-simple--look up in lists */ + r.v.n = d[*p++ - s]; + } + + /* fill code-like entries with r */ + f = 1 << (k - w); + for (j = i >> w; j < z; j += f) + q[j] = r; + + /* backwards increment the k-bit code i */ + for (j = 1 << (k - 1); i & j; j >>= 1) + i ^= j; + i ^= j; + + /* backup over finished tables */ + while ((i & ((1 << w) - 1)) != x[h]) { + h--; /* don't need to update q */ + w -= l; + } + } + } + /* Return true (1) if we were given an incomplete table */ + return y != 0 && g != 1; +} + + +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[] */ + +/* inflate (decompress) the codes in a deflated (compressed) block. + Return an error code or zero if it all goes ok. */ +{ + register unsigned e; /* table entry flag/number of extra bits */ + unsigned n, d; /* length and index for copy */ + 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 */ + k = bk; + 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 */ + NEEDBITS((unsigned) bl) + if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(e) + } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) + > 16); + DUMPBITS(t->b) + if (e == 16) { /* then it's a literal */ + window[w++] = (uch) t->v.n; + Tracevv((stderr, "%c", window[w - 1])); + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + } else { /* it's an EOB or a length */ + + /* exit if end of block */ + if (e == 15) + break; + + /* get length of block to copy */ + NEEDBITS(e) + n = t->v.n + ((unsigned) b & mask_bits[e]); + DUMPBITS(e); + + /* decode distance of block to copy */ + NEEDBITS((unsigned) bd) + if ((e = (t = td + ((unsigned) b & md))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(e) + } + while ( + (e = + (t = + t->v.t + ((unsigned) b & mask_bits[e]))->e) > + 16); + DUMPBITS(t->b) + NEEDBITS(e) + d = w - t->v.n - ((unsigned) b & mask_bits[e]); + DUMPBITS(e) + Tracevv((stderr, "\\[%d,%d]", w - d, n)); + + /* do the copy */ + do { + n -= (e = + (e = + WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > + n ? n : e); +#if !defined(NOMEMCPY) && !defined(DEBUG) + if (w - d >= e) { /* (this test assumes unsigned comparison) */ + memcpy(window + w, window + d, e); + w += e; + d += e; + } else /* do it slow to avoid memcpy() overlap */ +#endif /* !NOMEMCPY */ + do { + window[w++] = window[d++]; + Tracevv((stderr, "%c", window[w - 1])); + } while (--e); + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + } while (n); + } + } + + /* restore the globals from the locals */ + outcnt = w; /* restore global window pointer */ + bb = b; /* restore global bit buffer */ + bk = k; + + /* done */ + 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 + Huffman tables. */ +{ + int i; /* temporary variable */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + 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; + for (; i < 256; i++) + l[i] = 9; + for (; i < 280; i++) + l[i] = 7; + for (; i < 288; i++) /* make a complete, but wrong code set */ + l[i] = 8; + bl = 7; + 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; + bd = 5; + if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { + huft_free(tl); + 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 */ + unsigned m; /* mask for bit lengths table */ + unsigned n; /* number of lengths to get */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + int bd; /* lookup bits for td */ + unsigned nb; /* number of bit length codes */ + unsigned nl; /* number of literal/length codes */ + unsigned nd; /* number of distance codes */ + +#ifdef PKZIP_BUG_WORKAROUND + unsigned ll[288 + 32]; /* literal/length and distance code lengths */ #else -DECLARE(ush, tab_prefix0, 1L << (BITS - 1)); -DECLARE(ush, tab_prefix1, 1L << (BITS - 1)); + unsigned ll[286 + 30]; /* literal/length and distance code lengths */ #endif + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ - /* local variables */ + /* make local bit buffer */ + b = bb; + k = bk; -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) */ + /* read in table lengths */ + NEEDBITS(5) + nl = 257 + ((unsigned) b & 0x1f); /* number of literal/length codes */ + DUMPBITS(5) + NEEDBITS(5) + nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ + DUMPBITS(5) + NEEDBITS(4) + nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ + DUMPBITS(4) +#ifdef PKZIP_BUG_WORKAROUND + if (nl > 288 || nd > 32) +#else + if (nl > 286 || nd > 30) +#endif + return 1; /* bad lengths */ -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 */ + /* read in bit-length-code lengths */ + for (j = 0; j < nb; j++) { + NEEDBITS(3) + ll[border[j]] = (unsigned) b & 7; + DUMPBITS(3) + } + for (; j < 19; j++) + ll[border[j]] = 0; -long header_bytes; /* number of bytes in gzip header */ + /* 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 */ + } -/* local functions */ + /* read in literal and distance code lengths */ + n = nl + nd; + m = mask_bits[bl]; + i = l = 0; + while ((unsigned) i < n) { + NEEDBITS((unsigned) bl) + j = (td = tl + ((unsigned) b & m))->b; + DUMPBITS(j) + j = td->v.n; + 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) + j = 3 + ((unsigned) b & 3); + DUMPBITS(2) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = l; + } else if (j == 17) { /* 3 to 10 zero length codes */ + NEEDBITS(3) + j = 3 + ((unsigned) b & 7); + DUMPBITS(3) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } else { /* j == 18: 11 to 138 zero length codes */ -local int get_method (int in); + NEEDBITS(7) + j = 11 + ((unsigned) b & 0x7f); + DUMPBITS(7) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } + } -#define strequ(s1, s2) (strcmp((s1),(s2)) == 0) + /* 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) { + if (i == 1) { + fprintf(stderr, " incomplete literal tree\n"); + huft_free(tl); + } + 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"); + huft_free(td); + } + huft_free(tl); + 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; +} + +/* decompress an inflated block */ +int inflate_block(e) +int *e; /* last block flag */ +{ + 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(); + if (t == 0) + return inflate_stored(); + 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 */ + + /* initialize window, bit buffer */ + outcnt = 0; + bk = 0; + bb = 0; + + /* decompress until the last block */ + h = 0; + do { + hufts = 0; + if ((r = inflate_block(&e)) != 0) + return r; + if (hufts > h) + h = hufts; + } while (!e); + + /* Undo too much lookahead. The next read will be byte aligned so we + * can discard unused bits in the last meaningful byte. + */ + while (bk >= 8) { + bk -= 8; + inptr--; + } + + /* 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) @@ -633,16 +1267,12 @@ int gunzip_main(int argc, char **argv) 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 + 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"); @@ -744,1452 +1374,3 @@ int gunzip_main(int argc, char **argv) } return(exit_code); } - - -/* ======================================================================== - * Check the magic number of the input file and update ofname if an - * original name was given and tostdout is not set. - * Return the compression method, -1 for error, -2 for warning. - * Set inptr to the offset of the next byte to be processed. - * Updates time_stamp if there is one and --no-time is not used. - * This function may be called repeatedly for an input file consisting - * of several contiguous gzip'ed members. - * 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 */ -{ - uch flags; /* compression flags */ - char magic[2]; /* magic 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; - last_member = RECORD_IO; - /* assume multiple members in gzip file except for record oriented I/O */ - - if (memcmp(magic, GZIP_MAGIC, 2) == 0) { - - method = (int) get_byte(); - if (method != DEFLATED) { - errorMsg("unknown method %d -- get newer version of gzip\n", - method); - exit_code = ERROR; - return -1; - } - flags = (uch) get_byte(); - - (ulg) get_byte(); /* Ignore time stamp */ - (ulg) get_byte(); - (ulg) get_byte(); - (ulg) get_byte(); - - (void) get_byte(); /* Ignore extra flags for the moment */ - (void) get_byte(); /* Ignore OS type for the moment */ - - 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 */ - ; - } - - /* Discard file comment if any */ - if ((flags & COMMENT) != 0) { - while (get_char() != 0) /* null */ - ; - } - if (part_nb == 1) { - header_bytes = inptr + 2 * sizeof(long); /* include crc and size */ - } - - } - - if (method >= 0) - return method; - - if (part_nb == 1) { - fprintf(stderr, "\nnot in gzip format\n"); - exit_code = ERROR; - return -1; - } else { - WARN((stderr, "\ndecompression OK, trailing garbage ignored\n")); - return -2; - } -} - -/* ======================================================================== - * Signal and error handler. - */ -RETSIGTYPE 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 -#include -#include - -#ifdef HAVE_UNISTD_H -# include -#endif -#ifndef NO_FCNTL_H -# include -#endif - -#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H) -# include -#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[] */ -{ - register ulg c; /* temporary variable */ - - static ulg crc = (ulg) 0xffffffffL; /* shift register contents */ - - if (s == NULL) { - c = 0xffffffffL; - } else { - c = crc; - if (n) - do { - c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8); - } while (--n); - } - crc = c; - return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ -} - -/* =========================================================================== - * Clear input and output buffers - */ -void clear_bufs(void) -{ - outcnt = 0; - insize = inptr = 0; - bytes_in = bytes_out = 0L; -} - -/* =========================================================================== - * 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; - - /* 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 (insize == 0) { - if (eof_ok) - return EOF; - read_error_msg(); - } - 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; -} - -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -void flush_window() -{ - if (outcnt == 0) - return; - updcrc(window, outcnt); - - if (!test_mode) - write_buf(ofd, (char *) window, outcnt); - bytes_out += (ulg) outcnt; - 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; -{ - 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. */ - -# ifndef __STDC__ -# define const -# endif - -int strspn (const char *s, const char *accept); -int strcspn (const char *s, const char *reject); - -/* ======================================================================== - * Return the length of the maximum initial segment - * of s which contains only characters in accept. - */ -int strspn(s, accept) -const char *s; -const char *accept; -{ - register const char *p; - register const char *a; - register int count = 0; - - for (p = s; *p != '\0'; ++p) { - for (a = accept; *a != '\0'; ++a) { - if (*p == *a) - break; - } - if (*a == '\0') - return count; - ++count; - } - 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; -} - -#endif /* NO_STRING_H */ - - -/* ======================================================================== - * Error handlers. - */ -void read_error_msg() -{ - fprintf(stderr, "\n"); - if (errno != 0) { - perror(""); - } else { - fprintf(stderr, "unexpected end of file\n"); - } - abort_gzip(); -} - -void write_error_msg() -{ - fprintf(stderr, "\n"); - perror(""); - abort_gzip(); -} - - -/* ======================================================================== - * 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 - -#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H) -# include -#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())<>=(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 */ - -/* 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 - the given code set is incomplete (the tables are still built in this - 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) */ - 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 */ - - - /* Generate counts for each bit length */ - memzero(c, 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) */ - } while (--i); - 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 */ - if ((unsigned) l < j) - l = j; - for (i = BMAX; i; i--) - if (c[i]) - break; - 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 */ - 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 */ - *xp++ = (j += *p++); - } - - - /* Make a table of values in order of bit lengths */ - p = b; - i = 0; - do { - if ((j = *p++) != 0) - 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) */ - u[0] = (struct huft *) NULL; /* just to keep compilers happy */ - q = (struct huft *) NULL; /* ditto */ - z = 0; /* ditto */ - - /* go through the bit lengths (k already is bits in shortest code) */ - for (; k <= g; k++) { - a = c[k]; - while (a--) { - /* here i is the Huffman code of length k bits for value *p */ - /* make tables up to required level */ - while (k > w + l) { - h++; - 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 */ - if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ - f -= a + 1; /* deduct codes from patterns left */ - xp = c + k; - while (++j < z) { /* try smaller tables up to z bits */ - if ((f <<= 1) <= *++xp) - break; /* enough codes to use up j bits */ - f -= *xp; /* else deduct codes from patterns */ - } - } - z = 1 << j; /* table entries for j-bit table */ - - /* allocate and link in new table */ - if ( - (q = - (struct huft *) malloc((z + 1) * - sizeof(struct huft))) == - (struct huft *) NULL) { - if (h) - huft_free(u[0]); - return 3; /* not enough memory */ - } - hufts += z + 1; /* track memory usage */ - *t = q + 1; /* link to list for huft_free() */ - *(t = &(q->v.t)) = (struct huft *) NULL; - u[h] = ++q; /* table starts after link */ - - /* connect to last table, if there is one */ - if (h) { - x[h] = i; /* save pattern for backing up */ - r.b = (uch) l; /* bits to dump before this table */ - r.e = (uch) (16 + j); /* bits in this table */ - r.v.t = q; /* pointer to this table */ - j = i >> (w - l); /* (get around Turbo C bug) */ - u[h - 1][j] = r; /* connect to last table */ - } - } - - /* set up table entry in r */ - r.b = (uch) (k - w); - if (p >= v + n) - r.e = 99; /* out of values--invalid code */ - else if (*p < s) { - r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ - r.v.n = (ush) (*p); /* simple code is just the value */ - p++; /* one compiler does not like *p++ */ - } else { - r.e = (uch) e[*p - s]; /* non-simple--look up in lists */ - r.v.n = d[*p++ - s]; - } - - /* fill code-like entries with r */ - f = 1 << (k - w); - for (j = i >> w; j < z; j += f) - q[j] = r; - - /* backwards increment the k-bit code i */ - for (j = 1 << (k - 1); i & j; j >>= 1) - i ^= j; - i ^= j; - - /* backup over finished tables */ - while ((i & ((1 << w) - 1)) != x[h]) { - h--; /* don't need to update q */ - w -= l; - } - } - } - - - /* 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[] */ - -/* inflate (decompress) the codes in a deflated (compressed) block. - Return an error code or zero if it all goes ok. */ -{ - register unsigned e; /* table entry flag/number of extra bits */ - unsigned n, d; /* length and index for copy */ - 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 */ - k = bk; - w = wp; /* 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 */ - NEEDBITS((unsigned) bl) - if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) - > 16); - DUMPBITS(t->b) - if (e == 16) { /* then it's a literal */ - slide[w++] = (uch) t->v.n; - Tracevv((stderr, "%c", slide[w - 1])); - if (w == WSIZE) { - flush_output(w); - w = 0; - } - } else { /* it's an EOB or a length */ - - /* exit if end of block */ - if (e == 15) - break; - - /* get length of block to copy */ - NEEDBITS(e) - n = t->v.n + ((unsigned) b & mask_bits[e]); - DUMPBITS(e); - - /* decode distance of block to copy */ - NEEDBITS((unsigned) bd) - if ((e = (t = td + ((unsigned) b & md))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } - while ( - (e = - (t = - t->v.t + ((unsigned) b & mask_bits[e]))->e) > - 16); - DUMPBITS(t->b) - NEEDBITS(e) - d = w - t->v.n - ((unsigned) b & mask_bits[e]); - DUMPBITS(e) - Tracevv((stderr, "\\[%d,%d]", w - d, n)); - - /* do the copy */ - do { - n -= (e = - (e = - WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > - n ? n : e); -#if !defined(NOMEMCPY) && !defined(DEBUG) - if (w - d >= e) { /* (this test assumes unsigned comparison) */ - memcpy(slide + w, slide + 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])); - } while (--e); - if (w == WSIZE) { - flush_output(w); - w = 0; - } - } while (n); - } - } - - - /* restore the globals from the locals */ - wp = 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 - Huffman tables. */ -{ - int i; /* temporary variable */ - struct huft *tl; /* literal/length code table */ - struct huft *td; /* distance code table */ - int bl; /* lookup bits for tl */ - 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; - for (; i < 256; i++) - l[i] = 9; - for (; i < 280; i++) - l[i] = 7; - for (; i < 288; i++) /* make a complete, but wrong code set */ - l[i] = 8; - bl = 7; - 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; - bd = 5; - if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { - huft_free(tl); - 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 i; /* temporary variables */ - unsigned j; - unsigned l; /* last length */ - unsigned m; /* mask for bit lengths table */ - unsigned n; /* number of lengths to get */ - struct huft *tl; /* literal/length code table */ - struct huft *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned nb; /* number of bit length codes */ - unsigned nl; /* number of literal/length codes */ - unsigned nd; /* number of distance codes */ - -#ifdef PKZIP_BUG_WORKAROUND - unsigned ll[288 + 32]; /* literal/length and distance code lengths */ -#else - unsigned ll[286 + 30]; /* literal/length and distance code lengths */ -#endif - 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 */ - DUMPBITS(5) - NEEDBITS(5) - nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ - DUMPBITS(5) - NEEDBITS(4) - nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ - DUMPBITS(4) -#ifdef PKZIP_BUG_WORKAROUND - if (nl > 288 || nd > 32) -#else - if (nl > 286 || nd > 30) -#endif - return 1; /* bad lengths */ - - - /* read in bit-length-code lengths */ - for (j = 0; j < nb; j++) { - NEEDBITS(3) - ll[border[j]] = (unsigned) b & 7; - DUMPBITS(3) - } - 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 */ - } - - - /* read in literal and distance code lengths */ - n = nl + nd; - m = mask_bits[bl]; - i = l = 0; - while ((unsigned) i < n) { - NEEDBITS((unsigned) bl) - j = (td = tl + ((unsigned) b & m))->b; - DUMPBITS(j) - j = td->v.n; - 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) - j = 3 + ((unsigned) b & 3); - DUMPBITS(2) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = l; - } else if (j == 17) { /* 3 to 10 zero length codes */ - NEEDBITS(3) - j = 3 + ((unsigned) b & 7); - DUMPBITS(3) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } else { /* j == 18: 11 to 138 zero length codes */ - - NEEDBITS(7) - j = 11 + ((unsigned) b & 0x7f); - DUMPBITS(7) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } - } - - - /* 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) { - if (i == 1) { - fprintf(stderr, " incomplete literal tree\n"); - huft_free(tl); - } - 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 - } - - - /* 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 */ -{ - 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(); - if (t == 0) - return inflate_stored(); - 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 */ - - - /* initialize window, bit buffer */ - wp = 0; - bk = 0; - bb = 0; - - - /* decompress until the last block */ - h = 0; - do { - hufts = 0; - if ((r = inflate_block(&e)) != 0) - return r; - if (hufts > h) - h = hufts; - } while (!e); - - /* Undo too much lookahead. The next read will be byte aligned so we - * can discard unused bits in the last meaningful byte. - */ - while (bk >= 8) { - bk -= 8; - inptr--; - } - - /* flush out slide */ - flush_output(wp); - - - /* return success */ -#ifdef DEBUG - fprintf(stderr, "<%u> ", h); -#endif /* DEBUG */ - return 0; -} diff --git a/gunzip.c b/gunzip.c index ee8693013..7a360a6ea 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 * 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 - -/* 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 #include #include #include #include - -/* #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. - */ +#include +#include +#include +#include +#include +#include +#include +#include +#define BB_DECLARE_EXTERN +#define bb_need_memory_exhausted +#define bb_need_name_too_long +#include "messages.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 -#if !defined(NO_STRING_H) || defined(STDC_HEADERS) -# include -# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__) -# include -# endif -# define memzero(s, n) memset ((void *)(s), 0, (n)) -#else -# include -# 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 - -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; - /* Return codes from gzip */ #define OK 0 #define ERROR 1 #define WARNING 2 -/* Compression methods (see algorithm.doc) */ -#define DEFLATED 8 +#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 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 */ - -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 */ +#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 */ -#ifndef WSIZE -# define WSIZE 0x8000 /* window size--must be a power of two, and */ -#endif /* at least 32K for zip's deflate method */ +/* 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 MIN_MATCH 3 -#define MAX_MATCH 258 -/* The minimum and maximum match lengths */ +/* 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 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 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); \ -} - -#define seekable() 0 /* force sequential output */ -#define translate_eol 0 /* no option -a yet */ - -#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */ - -/* 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 -#include -#include -#include -#if defined(DIRENT) -# include -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 -typedef struct direct dir_type; - -# define DIR_OPT "SYSDIR" -# else -# ifdef SYSNDIR -# include -typedef struct direct dir_type; - -# define DIR_OPT "SYSNDIR" -# else -# ifdef NDIR -# include -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 -# 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 @@ -508,58 +136,1064 @@ 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())<>=(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)) + + /* in gzip.c */ +void abort_gzip (void); +typedef void (*sig_type) (int); + +typedef unsigned char uch; +typedef unsigned short ush; +typedef unsigned long ulg; +typedef int file_t; /* Do not use stdio */ + +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; + +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; +}; + +/* 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 +}; + +ush mask_bits[] = { + 0x0000, + 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, + 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff +}; + +/* ======================================================================== + * Error handlers. + */ +void read_error_msg() +{ + fprintf(stderr, "\n"); + if (errno != 0) { + perror(""); + } else { + fprintf(stderr, "unexpected end of file\n"); + } + abort_gzip(); +} + +/* =========================================================================== + * 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; + + /* 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 (insize == 0) { + if (eof_ok) + return EOF; + read_error_msg(); + } + bytes_in += (ulg) insize; + inptr = 1; + return inbuf[0]; +} - /* global buffers */ +/* ======================================================================== + * Check the magic number of the input file and update ofname if an + * original name was given and tostdout is not set. + * Return the compression method, -1 for error, -2 for warning. + * Set inptr to the offset of the next byte to be processed. + * Updates time_stamp if there is one and --no-time is not used. + * This function may be called repeatedly for an input file consisting + * of several contiguous gzip'ed members. + * IN assertions: there is at least one remaining compressed member. + * If the member is a zip file, it must be the only one. + */ +static int get_method(in) +int in; /* input file descriptor */ +{ + uch flags; /* compression flags */ + char magic[2]; /* magic header */ + long header_bytes = 0; /* number of bytes in gzip header */ -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); + magic[0] = (char) get_byte(); + magic[1] = (char) get_byte(); + 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 */ + + if (memcmp(magic, GZIP_MAGIC, 2) == 0) { + + method = (int) get_byte(); + if (method != DEFLATED) { + errorMsg("unknown method %d -- get newer version of gzip\n", method); + exit_code = ERROR; + return -1; + } + flags = (uch) get_byte(); + + (ulg) get_byte(); /* Ignore time stamp */ + (ulg) get_byte(); + (ulg) get_byte(); + (ulg) get_byte(); + + (void) get_byte(); /* Ignore extra flags for the moment */ + (void) get_byte(); /* Ignore OS type for the moment */ + + 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_byte() != 0); /* null */ + } + + /* Discard file comment if any */ + if ((flags & COMMENT) != 0) { + while (get_byte() != 0) /* null */ + ; + } + if (part_nb == 1) { + header_bytes = inptr + 2 * sizeof(long); /* include crc and size */ + } + + } + + if (method >= 0) + return method; + + if (part_nb == 1) { + fprintf(stderr, "\nnot in gzip format\n"); + exit_code = ERROR; + return -1; + } else { + fprintf(stderr, "\ndecompression OK, trailing garbage ignored\n"); + if (exit_code == OK) + exit_code = WARNING; + return -2; + } +} + +/* ======================================================================== + * Signal and error handler. + */ +void abort_gzip() +{ + exit(ERROR); +} + +/* =========================================================================== + * 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[] */ +{ + 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; + } else { + c = crc; + if (n) + do { + c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8); + } while (--n); + } + crc = c; + return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ +} + +void write_error_msg() +{ + fprintf(stderr, "\n"); + perror(""); + abort_gzip(); +} + +/* =========================================================================== + * 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; +{ + unsigned n; + + while ((n = write(fd, buf, cnt)) != cnt) { + if (n == (unsigned) (-1)) { + write_error_msg(); + } + cnt -= n; + buf = (void *) ((char *) buf + n); + } +} + +/* =========================================================================== + * Write the output window window[0..outcnt-1] and update crc and bytes_out. + * (Used for the decompressed data only.) + */ +void flush_window() +{ + if (outcnt == 0) + return; + updcrc(window, outcnt); + + if (!test_mode) + write_buf(ofd, (char *) window, outcnt); + bytes_out += (ulg) outcnt; + outcnt = 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 = outcnt; /* 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) + window[w++] = (uch) b; + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + DUMPBITS(8) + } + + /* restore the globals from the locals */ + outcnt = w; /* restore global window pointer */ + bb = b; /* restore global bit buffer */ + bk = k; + return 0; +} + +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 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 */ + +/* 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 + the given code set is incomplete (the tables are still built in this + 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) */ + 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 */ + + /* Generate counts for each bit length */ + 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) */ + } while (--i); + 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 */ + if ((unsigned) l < j) + l = j; + for (i = BMAX; i; i--) + if (c[i]) + break; + 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 */ + 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 */ + *xp++ = (j += *p++); + } + + /* Make a table of values in order of bit lengths */ + p = b; + i = 0; + do { + if ((j = *p++) != 0) + 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) */ + u[0] = (struct huft *) NULL; /* just to keep compilers happy */ + q = (struct huft *) NULL; /* ditto */ + z = 0; /* ditto */ + + /* go through the bit lengths (k already is bits in shortest code) */ + for (; k <= g; k++) { + a = c[k]; + while (a--) { + /* here i is the Huffman code of length k bits for value *p */ + /* make tables up to required level */ + while (k > w + l) { + h++; + 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 */ + if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ + f -= a + 1; /* deduct codes from patterns left */ + xp = c + k; + while (++j < z) { /* try smaller tables up to z bits */ + if ((f <<= 1) <= *++xp) + break; /* enough codes to use up j bits */ + f -= *xp; /* else deduct codes from patterns */ + } + } + z = 1 << j; /* table entries for j-bit table */ + + /* allocate and link in new table */ + if ( + (q = + (struct huft *) malloc((z + 1) * + sizeof(struct huft))) == + (struct huft *) NULL) { + if (h) + huft_free(u[0]); + return 3; /* not enough memory */ + } + hufts += z + 1; /* track memory usage */ + *t = q + 1; /* link to list for huft_free() */ + *(t = &(q->v.t)) = (struct huft *) NULL; + u[h] = ++q; /* table starts after link */ + + /* connect to last table, if there is one */ + if (h) { + x[h] = i; /* save pattern for backing up */ + r.b = (uch) l; /* bits to dump before this table */ + r.e = (uch) (16 + j); /* bits in this table */ + r.v.t = q; /* pointer to this table */ + j = i >> (w - l); /* (get around Turbo C bug) */ + u[h - 1][j] = r; /* connect to last table */ + } + } + + /* set up table entry in r */ + r.b = (uch) (k - w); + if (p >= v + n) + r.e = 99; /* out of values--invalid code */ + else if (*p < s) { + r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ + r.v.n = (ush) (*p); /* simple code is just the value */ + p++; /* one compiler does not like *p++ */ + } else { + r.e = (uch) e[*p - s]; /* non-simple--look up in lists */ + r.v.n = d[*p++ - s]; + } + + /* fill code-like entries with r */ + f = 1 << (k - w); + for (j = i >> w; j < z; j += f) + q[j] = r; + + /* backwards increment the k-bit code i */ + for (j = 1 << (k - 1); i & j; j >>= 1) + i ^= j; + i ^= j; + + /* backup over finished tables */ + while ((i & ((1 << w) - 1)) != x[h]) { + h--; /* don't need to update q */ + w -= l; + } + } + } + /* Return true (1) if we were given an incomplete table */ + return y != 0 && g != 1; +} + + +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[] */ + +/* inflate (decompress) the codes in a deflated (compressed) block. + Return an error code or zero if it all goes ok. */ +{ + register unsigned e; /* table entry flag/number of extra bits */ + unsigned n, d; /* length and index for copy */ + 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 */ + k = bk; + 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 */ + NEEDBITS((unsigned) bl) + if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(e) + } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) + > 16); + DUMPBITS(t->b) + if (e == 16) { /* then it's a literal */ + window[w++] = (uch) t->v.n; + Tracevv((stderr, "%c", window[w - 1])); + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + } else { /* it's an EOB or a length */ + + /* exit if end of block */ + if (e == 15) + break; + + /* get length of block to copy */ + NEEDBITS(e) + n = t->v.n + ((unsigned) b & mask_bits[e]); + DUMPBITS(e); + + /* decode distance of block to copy */ + NEEDBITS((unsigned) bd) + if ((e = (t = td + ((unsigned) b & md))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(e) + } + while ( + (e = + (t = + t->v.t + ((unsigned) b & mask_bits[e]))->e) > + 16); + DUMPBITS(t->b) + NEEDBITS(e) + d = w - t->v.n - ((unsigned) b & mask_bits[e]); + DUMPBITS(e) + Tracevv((stderr, "\\[%d,%d]", w - d, n)); + + /* do the copy */ + do { + n -= (e = + (e = + WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > + n ? n : e); +#if !defined(NOMEMCPY) && !defined(DEBUG) + if (w - d >= e) { /* (this test assumes unsigned comparison) */ + memcpy(window + w, window + d, e); + w += e; + d += e; + } else /* do it slow to avoid memcpy() overlap */ +#endif /* !NOMEMCPY */ + do { + window[w++] = window[d++]; + Tracevv((stderr, "%c", window[w - 1])); + } while (--e); + if (w == WSIZE) { +// flush_output(w); + outcnt=(w), + flush_window(); + w = 0; + } + } while (n); + } + } + + /* restore the globals from the locals */ + outcnt = w; /* restore global window pointer */ + bb = b; /* restore global bit buffer */ + bk = k; + + /* done */ + 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 + Huffman tables. */ +{ + int i; /* temporary variable */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + 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; + for (; i < 256; i++) + l[i] = 9; + for (; i < 280; i++) + l[i] = 7; + for (; i < 288; i++) /* make a complete, but wrong code set */ + l[i] = 8; + bl = 7; + 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; + bd = 5; + if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { + huft_free(tl); + 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 */ + unsigned m; /* mask for bit lengths table */ + unsigned n; /* number of lengths to get */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + int bd; /* lookup bits for td */ + unsigned nb; /* number of bit length codes */ + unsigned nl; /* number of literal/length codes */ + unsigned nd; /* number of distance codes */ + +#ifdef PKZIP_BUG_WORKAROUND + unsigned ll[288 + 32]; /* literal/length and distance code lengths */ #else -DECLARE(ush, tab_prefix0, 1L << (BITS - 1)); -DECLARE(ush, tab_prefix1, 1L << (BITS - 1)); + unsigned ll[286 + 30]; /* literal/length and distance code lengths */ #endif + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ - /* local variables */ + /* make local bit buffer */ + b = bb; + k = bk; -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) */ + /* read in table lengths */ + NEEDBITS(5) + nl = 257 + ((unsigned) b & 0x1f); /* number of literal/length codes */ + DUMPBITS(5) + NEEDBITS(5) + nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ + DUMPBITS(5) + NEEDBITS(4) + nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ + DUMPBITS(4) +#ifdef PKZIP_BUG_WORKAROUND + if (nl > 288 || nd > 32) +#else + if (nl > 286 || nd > 30) +#endif + return 1; /* bad lengths */ -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 */ + /* read in bit-length-code lengths */ + for (j = 0; j < nb; j++) { + NEEDBITS(3) + ll[border[j]] = (unsigned) b & 7; + DUMPBITS(3) + } + for (; j < 19; j++) + ll[border[j]] = 0; -long header_bytes; /* number of bytes in gzip header */ + /* 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 */ + } -/* local functions */ + /* read in literal and distance code lengths */ + n = nl + nd; + m = mask_bits[bl]; + i = l = 0; + while ((unsigned) i < n) { + NEEDBITS((unsigned) bl) + j = (td = tl + ((unsigned) b & m))->b; + DUMPBITS(j) + j = td->v.n; + 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) + j = 3 + ((unsigned) b & 3); + DUMPBITS(2) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = l; + } else if (j == 17) { /* 3 to 10 zero length codes */ + NEEDBITS(3) + j = 3 + ((unsigned) b & 7); + DUMPBITS(3) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } else { /* j == 18: 11 to 138 zero length codes */ -local int get_method (int in); + NEEDBITS(7) + j = 11 + ((unsigned) b & 0x7f); + DUMPBITS(7) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } + } -#define strequ(s1, s2) (strcmp((s1),(s2)) == 0) + /* 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) { + if (i == 1) { + fprintf(stderr, " incomplete literal tree\n"); + huft_free(tl); + } + 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"); + huft_free(td); + } + huft_free(tl); + 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; +} + +/* decompress an inflated block */ +int inflate_block(e) +int *e; /* last block flag */ +{ + 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(); + if (t == 0) + return inflate_stored(); + 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 */ + + /* initialize window, bit buffer */ + outcnt = 0; + bk = 0; + bb = 0; + + /* decompress until the last block */ + h = 0; + do { + hufts = 0; + if ((r = inflate_block(&e)) != 0) + return r; + if (hufts > h) + h = hufts; + } while (!e); + + /* Undo too much lookahead. The next read will be byte aligned so we + * can discard unused bits in the last meaningful byte. + */ + while (bk >= 8) { + bk -= 8; + inptr--; + } + + /* 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) @@ -633,16 +1267,12 @@ int gunzip_main(int argc, char **argv) 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 + 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"); @@ -744,1452 +1374,3 @@ int gunzip_main(int argc, char **argv) } return(exit_code); } - - -/* ======================================================================== - * Check the magic number of the input file and update ofname if an - * original name was given and tostdout is not set. - * Return the compression method, -1 for error, -2 for warning. - * Set inptr to the offset of the next byte to be processed. - * Updates time_stamp if there is one and --no-time is not used. - * This function may be called repeatedly for an input file consisting - * of several contiguous gzip'ed members. - * 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 */ -{ - uch flags; /* compression flags */ - char magic[2]; /* magic 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; - last_member = RECORD_IO; - /* assume multiple members in gzip file except for record oriented I/O */ - - if (memcmp(magic, GZIP_MAGIC, 2) == 0) { - - method = (int) get_byte(); - if (method != DEFLATED) { - errorMsg("unknown method %d -- get newer version of gzip\n", - method); - exit_code = ERROR; - return -1; - } - flags = (uch) get_byte(); - - (ulg) get_byte(); /* Ignore time stamp */ - (ulg) get_byte(); - (ulg) get_byte(); - (ulg) get_byte(); - - (void) get_byte(); /* Ignore extra flags for the moment */ - (void) get_byte(); /* Ignore OS type for the moment */ - - 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 */ - ; - } - - /* Discard file comment if any */ - if ((flags & COMMENT) != 0) { - while (get_char() != 0) /* null */ - ; - } - if (part_nb == 1) { - header_bytes = inptr + 2 * sizeof(long); /* include crc and size */ - } - - } - - if (method >= 0) - return method; - - if (part_nb == 1) { - fprintf(stderr, "\nnot in gzip format\n"); - exit_code = ERROR; - return -1; - } else { - WARN((stderr, "\ndecompression OK, trailing garbage ignored\n")); - return -2; - } -} - -/* ======================================================================== - * Signal and error handler. - */ -RETSIGTYPE 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 -#include -#include - -#ifdef HAVE_UNISTD_H -# include -#endif -#ifndef NO_FCNTL_H -# include -#endif - -#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H) -# include -#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[] */ -{ - register ulg c; /* temporary variable */ - - static ulg crc = (ulg) 0xffffffffL; /* shift register contents */ - - if (s == NULL) { - c = 0xffffffffL; - } else { - c = crc; - if (n) - do { - c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8); - } while (--n); - } - crc = c; - return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ -} - -/* =========================================================================== - * Clear input and output buffers - */ -void clear_bufs(void) -{ - outcnt = 0; - insize = inptr = 0; - bytes_in = bytes_out = 0L; -} - -/* =========================================================================== - * 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; - - /* 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 (insize == 0) { - if (eof_ok) - return EOF; - read_error_msg(); - } - 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; -} - -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -void flush_window() -{ - if (outcnt == 0) - return; - updcrc(window, outcnt); - - if (!test_mode) - write_buf(ofd, (char *) window, outcnt); - bytes_out += (ulg) outcnt; - 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; -{ - 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. */ - -# ifndef __STDC__ -# define const -# endif - -int strspn (const char *s, const char *accept); -int strcspn (const char *s, const char *reject); - -/* ======================================================================== - * Return the length of the maximum initial segment - * of s which contains only characters in accept. - */ -int strspn(s, accept) -const char *s; -const char *accept; -{ - register const char *p; - register const char *a; - register int count = 0; - - for (p = s; *p != '\0'; ++p) { - for (a = accept; *a != '\0'; ++a) { - if (*p == *a) - break; - } - if (*a == '\0') - return count; - ++count; - } - 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; -} - -#endif /* NO_STRING_H */ - - -/* ======================================================================== - * Error handlers. - */ -void read_error_msg() -{ - fprintf(stderr, "\n"); - if (errno != 0) { - perror(""); - } else { - fprintf(stderr, "unexpected end of file\n"); - } - abort_gzip(); -} - -void write_error_msg() -{ - fprintf(stderr, "\n"); - perror(""); - abort_gzip(); -} - - -/* ======================================================================== - * 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 - -#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H) -# include -#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())<>=(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 */ - -/* 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 - the given code set is incomplete (the tables are still built in this - 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) */ - 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 */ - - - /* Generate counts for each bit length */ - memzero(c, 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) */ - } while (--i); - 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 */ - if ((unsigned) l < j) - l = j; - for (i = BMAX; i; i--) - if (c[i]) - break; - 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 */ - 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 */ - *xp++ = (j += *p++); - } - - - /* Make a table of values in order of bit lengths */ - p = b; - i = 0; - do { - if ((j = *p++) != 0) - 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) */ - u[0] = (struct huft *) NULL; /* just to keep compilers happy */ - q = (struct huft *) NULL; /* ditto */ - z = 0; /* ditto */ - - /* go through the bit lengths (k already is bits in shortest code) */ - for (; k <= g; k++) { - a = c[k]; - while (a--) { - /* here i is the Huffman code of length k bits for value *p */ - /* make tables up to required level */ - while (k > w + l) { - h++; - 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 */ - if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ - f -= a + 1; /* deduct codes from patterns left */ - xp = c + k; - while (++j < z) { /* try smaller tables up to z bits */ - if ((f <<= 1) <= *++xp) - break; /* enough codes to use up j bits */ - f -= *xp; /* else deduct codes from patterns */ - } - } - z = 1 << j; /* table entries for j-bit table */ - - /* allocate and link in new table */ - if ( - (q = - (struct huft *) malloc((z + 1) * - sizeof(struct huft))) == - (struct huft *) NULL) { - if (h) - huft_free(u[0]); - return 3; /* not enough memory */ - } - hufts += z + 1; /* track memory usage */ - *t = q + 1; /* link to list for huft_free() */ - *(t = &(q->v.t)) = (struct huft *) NULL; - u[h] = ++q; /* table starts after link */ - - /* connect to last table, if there is one */ - if (h) { - x[h] = i; /* save pattern for backing up */ - r.b = (uch) l; /* bits to dump before this table */ - r.e = (uch) (16 + j); /* bits in this table */ - r.v.t = q; /* pointer to this table */ - j = i >> (w - l); /* (get around Turbo C bug) */ - u[h - 1][j] = r; /* connect to last table */ - } - } - - /* set up table entry in r */ - r.b = (uch) (k - w); - if (p >= v + n) - r.e = 99; /* out of values--invalid code */ - else if (*p < s) { - r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ - r.v.n = (ush) (*p); /* simple code is just the value */ - p++; /* one compiler does not like *p++ */ - } else { - r.e = (uch) e[*p - s]; /* non-simple--look up in lists */ - r.v.n = d[*p++ - s]; - } - - /* fill code-like entries with r */ - f = 1 << (k - w); - for (j = i >> w; j < z; j += f) - q[j] = r; - - /* backwards increment the k-bit code i */ - for (j = 1 << (k - 1); i & j; j >>= 1) - i ^= j; - i ^= j; - - /* backup over finished tables */ - while ((i & ((1 << w) - 1)) != x[h]) { - h--; /* don't need to update q */ - w -= l; - } - } - } - - - /* 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[] */ - -/* inflate (decompress) the codes in a deflated (compressed) block. - Return an error code or zero if it all goes ok. */ -{ - register unsigned e; /* table entry flag/number of extra bits */ - unsigned n, d; /* length and index for copy */ - 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 */ - k = bk; - w = wp; /* 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 */ - NEEDBITS((unsigned) bl) - if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) - > 16); - DUMPBITS(t->b) - if (e == 16) { /* then it's a literal */ - slide[w++] = (uch) t->v.n; - Tracevv((stderr, "%c", slide[w - 1])); - if (w == WSIZE) { - flush_output(w); - w = 0; - } - } else { /* it's an EOB or a length */ - - /* exit if end of block */ - if (e == 15) - break; - - /* get length of block to copy */ - NEEDBITS(e) - n = t->v.n + ((unsigned) b & mask_bits[e]); - DUMPBITS(e); - - /* decode distance of block to copy */ - NEEDBITS((unsigned) bd) - if ((e = (t = td + ((unsigned) b & md))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } - while ( - (e = - (t = - t->v.t + ((unsigned) b & mask_bits[e]))->e) > - 16); - DUMPBITS(t->b) - NEEDBITS(e) - d = w - t->v.n - ((unsigned) b & mask_bits[e]); - DUMPBITS(e) - Tracevv((stderr, "\\[%d,%d]", w - d, n)); - - /* do the copy */ - do { - n -= (e = - (e = - WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > - n ? n : e); -#if !defined(NOMEMCPY) && !defined(DEBUG) - if (w - d >= e) { /* (this test assumes unsigned comparison) */ - memcpy(slide + w, slide + 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])); - } while (--e); - if (w == WSIZE) { - flush_output(w); - w = 0; - } - } while (n); - } - } - - - /* restore the globals from the locals */ - wp = 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 - Huffman tables. */ -{ - int i; /* temporary variable */ - struct huft *tl; /* literal/length code table */ - struct huft *td; /* distance code table */ - int bl; /* lookup bits for tl */ - 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; - for (; i < 256; i++) - l[i] = 9; - for (; i < 280; i++) - l[i] = 7; - for (; i < 288; i++) /* make a complete, but wrong code set */ - l[i] = 8; - bl = 7; - 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; - bd = 5; - if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { - huft_free(tl); - 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 i; /* temporary variables */ - unsigned j; - unsigned l; /* last length */ - unsigned m; /* mask for bit lengths table */ - unsigned n; /* number of lengths to get */ - struct huft *tl; /* literal/length code table */ - struct huft *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned nb; /* number of bit length codes */ - unsigned nl; /* number of literal/length codes */ - unsigned nd; /* number of distance codes */ - -#ifdef PKZIP_BUG_WORKAROUND - unsigned ll[288 + 32]; /* literal/length and distance code lengths */ -#else - unsigned ll[286 + 30]; /* literal/length and distance code lengths */ -#endif - 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 */ - DUMPBITS(5) - NEEDBITS(5) - nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ - DUMPBITS(5) - NEEDBITS(4) - nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ - DUMPBITS(4) -#ifdef PKZIP_BUG_WORKAROUND - if (nl > 288 || nd > 32) -#else - if (nl > 286 || nd > 30) -#endif - return 1; /* bad lengths */ - - - /* read in bit-length-code lengths */ - for (j = 0; j < nb; j++) { - NEEDBITS(3) - ll[border[j]] = (unsigned) b & 7; - DUMPBITS(3) - } - 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 */ - } - - - /* read in literal and distance code lengths */ - n = nl + nd; - m = mask_bits[bl]; - i = l = 0; - while ((unsigned) i < n) { - NEEDBITS((unsigned) bl) - j = (td = tl + ((unsigned) b & m))->b; - DUMPBITS(j) - j = td->v.n; - 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) - j = 3 + ((unsigned) b & 3); - DUMPBITS(2) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = l; - } else if (j == 17) { /* 3 to 10 zero length codes */ - NEEDBITS(3) - j = 3 + ((unsigned) b & 7); - DUMPBITS(3) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } else { /* j == 18: 11 to 138 zero length codes */ - - NEEDBITS(7) - j = 11 + ((unsigned) b & 0x7f); - DUMPBITS(7) - if ((unsigned) i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } - } - - - /* 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) { - if (i == 1) { - fprintf(stderr, " incomplete literal tree\n"); - huft_free(tl); - } - 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 - } - - - /* 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 */ -{ - 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(); - if (t == 0) - return inflate_stored(); - 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 */ - - - /* initialize window, bit buffer */ - wp = 0; - bk = 0; - bb = 0; - - - /* decompress until the last block */ - h = 0; - do { - hufts = 0; - if ((r = inflate_block(&e)) != 0) - return r; - if (hufts > h) - h = hufts; - } while (!e); - - /* Undo too much lookahead. The next read will be byte aligned so we - * can discard unused bits in the last meaningful byte. - */ - while (bk >= 8) { - bk -= 8; - inptr--; - } - - /* flush out slide */ - flush_output(wp); - - - /* return success */ -#ifdef DEBUG - fprintf(stderr, "<%u> ", h); -#endif /* DEBUG */ - return 0; -}