Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * gunzip implementation for busybox |
| 4 | * |
| 5 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
| 6 | * |
| 7 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
| 8 | * based on gzip sources |
| 9 | * |
Eric Andersen | db93094 | 2001-12-06 08:20:14 +0000 | [diff] [blame] | 10 | * Adjusted further by Erik Andersen <andersee@debian.org> to support |
| 11 | * files as well as stdin/stdout, and to generally behave itself wrt |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 12 | * command line handling. |
| 13 | * |
| 14 | * General cleanup to better adhere to the style guide and make use of standard |
| 15 | * busybox functions by Glenn McGrath <bug1@optushome.com.au> |
| 16 | * |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 17 | * read_gz interface + associated hacking by Laurence Anderson |
| 18 | * |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 19 | * This program is free software; you can redistribute it and/or modify |
| 20 | * it under the terms of the GNU General Public License as published by |
| 21 | * the Free Software Foundation; either version 2 of the License, or |
| 22 | * (at your option) any later version. |
| 23 | * |
| 24 | * This program is distributed in the hope that it will be useful, |
| 25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 27 | * General Public License for more details. |
| 28 | * |
| 29 | * You should have received a copy of the GNU General Public License |
| 30 | * along with this program; if not, write to the Free Software |
| 31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 32 | * |
| 33 | * |
| 34 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
| 35 | * Copyright (C) 1992-1993 Jean-loup Gailly |
| 36 | * The unzip code was written and put in the public domain by Mark Adler. |
| 37 | * Portions of the lzw code are derived from the public domain 'compress' |
| 38 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
| 39 | * Ken Turkowski, Dave Mack and Peter Jannesen. |
| 40 | * |
| 41 | * See the license_msg below and the file COPYING for the software license. |
| 42 | * See the file algorithm.doc for the compression algorithms and file formats. |
| 43 | */ |
| 44 | |
| 45 | #if 0 |
| 46 | static char *license_msg[] = { |
| 47 | " Copyright (C) 1992-1993 Jean-loup Gailly", |
| 48 | " This program is free software; you can redistribute it and/or modify", |
| 49 | " it under the terms of the GNU General Public License as published by", |
| 50 | " the Free Software Foundation; either version 2, or (at your option)", |
| 51 | " any later version.", |
| 52 | "", |
| 53 | " This program is distributed in the hope that it will be useful,", |
| 54 | " but WITHOUT ANY WARRANTY; without even the implied warranty of", |
| 55 | " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the", |
| 56 | " GNU General Public License for more details.", |
| 57 | "", |
| 58 | " You should have received a copy of the GNU General Public License", |
| 59 | " along with this program; if not, write to the Free Software", |
| 60 | " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.", |
| 61 | 0 |
| 62 | }; |
| 63 | #endif |
| 64 | |
| 65 | #include <sys/types.h> |
| 66 | #include <sys/wait.h> |
| 67 | #include <signal.h> |
| 68 | #include <stdlib.h> |
Manuel Novoa III | a2949aa | 2001-06-29 18:59:32 +0000 | [diff] [blame] | 69 | #include <string.h> |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 70 | #include <unistd.h> |
| 71 | #include <fcntl.h> |
Robert Griebl | f6495eb | 2002-05-15 22:13:47 +0000 | [diff] [blame] | 72 | #include "config.h" |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 73 | #include "busybox.h" |
| 74 | #include "unarchive.h" |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 75 | |
| 76 | typedef struct huft_s { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 77 | unsigned char e; /* number of extra bits or operation */ |
| 78 | unsigned char b; /* number of bits in this code or subcode */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 79 | union { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 80 | unsigned short n; /* literal, length base, or distance base */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 81 | struct huft_s *t; /* pointer to next level of table */ |
| 82 | } v; |
| 83 | } huft_t; |
| 84 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 85 | static int gunzip_src_fd; |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 86 | static unsigned int gunzip_bytes_out; /* number of output bytes */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 87 | static unsigned int gunzip_outbuf_count; /* bytes in output buffer */ |
| 88 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 89 | /* gunzip_window size--must be a power of two, and |
| 90 | * at least 32K for zip's deflate method */ |
| 91 | static const int gunzip_wsize = 0x8000; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 92 | static unsigned char *gunzip_window; |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 93 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 94 | static unsigned int *gunzip_crc_table; |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 95 | static unsigned int gunzip_crc; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 96 | |
| 97 | /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ |
| 98 | #define BMAX 16 /* maximum bit length of any code (16 for explode) */ |
| 99 | #define N_MAX 288 /* maximum number of codes in any set */ |
| 100 | |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 101 | /* bitbuffer */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 102 | static unsigned int gunzip_bb; /* bit buffer */ |
| 103 | static unsigned char gunzip_bk; /* bits in bit buffer */ |
| 104 | |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 105 | /* These control the size of the bytebuffer */ |
| 106 | #define BYTEBUFFER_MAX 0x8000 |
| 107 | static unsigned char *bytebuffer = NULL; |
| 108 | static unsigned int bytebuffer_offset = 0; |
| 109 | static unsigned int bytebuffer_size = 0; |
| 110 | |
Eric Andersen | 044228d | 2001-07-17 01:12:36 +0000 | [diff] [blame] | 111 | static const unsigned short mask_bits[] = { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 112 | 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 113 | 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff |
| 114 | }; |
| 115 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 116 | /* Copy lengths for literal codes 257..285 */ |
| 117 | static const unsigned short cplens[] = { |
| 118 | 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, |
| 119 | 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 |
| 120 | }; |
| 121 | |
| 122 | /* note: see note #13 above about the 258 in this list. */ |
| 123 | /* Extra bits for literal codes 257..285 */ |
| 124 | static const unsigned char cplext[] = { |
| 125 | 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, |
| 126 | 5, 5, 5, 0, 99, 99 |
| 127 | }; /* 99==invalid */ |
| 128 | |
| 129 | /* Copy offsets for distance codes 0..29 */ |
| 130 | static const unsigned short cpdist[] = { |
| 131 | 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, |
| 132 | 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 |
| 133 | }; |
| 134 | |
| 135 | /* Extra bits for distance codes */ |
| 136 | static const unsigned char cpdext[] = { |
| 137 | 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, |
| 138 | 11, 11, 12, 12, 13, 13 |
| 139 | }; |
| 140 | |
| 141 | /* Tables for deflate from PKZIP's appnote.txt. */ |
| 142 | /* Order of the bit length code lengths */ |
| 143 | static const unsigned char border[] = { |
| 144 | 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 |
| 145 | }; |
| 146 | |
Glenn L McGrath | f3faf41 | 2002-12-01 21:52:40 +0000 | [diff] [blame] | 147 | static void fill_bytebuffer(void) |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 148 | { |
| 149 | if (bytebuffer_offset >= bytebuffer_size) { |
| 150 | /* Leave the first 4 bytes empty so we can always unwind the bitbuffer |
| 151 | * to the front of the bytebuffer, leave 4 bytes free at end of tail |
| 152 | * so we can easily top up buffer in check_trailer_gzip() */ |
| 153 | bytebuffer_size = 4 + xread(gunzip_src_fd, &bytebuffer[4], BYTEBUFFER_MAX - 8); |
| 154 | bytebuffer_offset = 4; |
| 155 | } |
| 156 | } |
| 157 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 158 | static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required) |
| 159 | { |
| 160 | while (*current < required) { |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 161 | fill_bytebuffer(); |
| 162 | bitbuffer |= ((unsigned int) bytebuffer[bytebuffer_offset]) << *current; |
| 163 | bytebuffer_offset++; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 164 | *current += 8; |
| 165 | } |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 166 | return(bitbuffer); |
| 167 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 168 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 169 | static void make_gunzip_crc_table(void) |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 170 | { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 171 | const unsigned int poly = 0xedb88320; /* polynomial exclusive-or pattern */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 172 | unsigned short i; /* counter for all possible eight bit values */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 173 | |
Eric Andersen | 89de1e7 | 2002-03-20 13:30:40 +0000 | [diff] [blame] | 174 | /* initial shift register value */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 175 | gunzip_crc = 0xffffffffL; |
| 176 | gunzip_crc_table = (unsigned int *) malloc(256 * sizeof(unsigned int)); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 177 | |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 178 | /* Compute and print table of CRC's, five per line */ |
| 179 | for (i = 0; i < 256; i++) { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 180 | unsigned int table_entry; /* crc shift register */ |
| 181 | unsigned char k; /* byte being shifted into crc apparatus */ |
Glenn L McGrath | ef03dbc | 2001-12-05 13:08:03 +0000 | [diff] [blame] | 182 | |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 183 | table_entry = i; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 184 | /* The idea to initialize the register with the byte instead of |
| 185 | * zero was stolen from Haruhiko Okumura's ar002 |
| 186 | */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 187 | for (k = 8; k; k--) { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 188 | if (table_entry & 1) { |
| 189 | table_entry = (table_entry >> 1) ^ poly; |
| 190 | } else { |
| 191 | table_entry >>= 1; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 192 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 193 | } |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 194 | gunzip_crc_table[i] = table_entry; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 195 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Free the malloc'ed tables built by huft_build(), which makes a linked |
| 200 | * list of the tables it made, with the links in a dummy first entry of |
| 201 | * each table. |
| 202 | * t: table to free |
| 203 | */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 204 | static int huft_free(huft_t * t) |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 205 | { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 206 | huft_t *p; |
| 207 | huft_t *q; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 208 | |
| 209 | /* Go through linked list, freeing from the malloced (t[-1]) address. */ |
| 210 | p = t; |
| 211 | while (p != (huft_t *) NULL) { |
| 212 | q = (--p)->v.t; |
| 213 | free((char *) p); |
| 214 | p = q; |
| 215 | } |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* Given a list of code lengths and a maximum table size, make a set of |
| 220 | * tables to decode that set of codes. Return zero on success, one if |
| 221 | * the given code set is incomplete (the tables are still built in this |
| 222 | * case), two if the input is invalid (all zero length codes or an |
| 223 | * oversubscribed set of lengths), and three if not enough memory. |
| 224 | * |
| 225 | * b: code lengths in bits (all assumed <= BMAX) |
| 226 | * n: number of codes (assumed <= N_MAX) |
| 227 | * s: number of simple-valued codes (0..s-1) |
| 228 | * d: list of base values for non-simple codes |
| 229 | * e: list of extra bits for non-simple codes |
| 230 | * t: result: starting table |
| 231 | * m: maximum lookup bits, returns actual |
| 232 | */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 233 | static int huft_build(unsigned int *b, const unsigned int n, |
| 234 | const unsigned int s, const unsigned short *d, |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 235 | const unsigned char *e, huft_t ** t, int *m) |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 236 | { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 237 | unsigned a; /* counter for codes of length k */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 238 | unsigned c[BMAX + 1]; /* bit length count table */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 239 | unsigned f; /* i repeats in table every f entries */ |
| 240 | int g; /* maximum code length */ |
| 241 | int h; /* table level */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 242 | register unsigned i; /* counter, current code */ |
| 243 | register unsigned j; /* counter */ |
| 244 | register int k; /* number of bits in current code */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 245 | int l; /* bits per table (returned in m) */ |
| 246 | register unsigned *p; /* pointer into c[], b[], or v[] */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 247 | register huft_t *q; /* points to current table */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 248 | huft_t r; /* table entry for structure assignment */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 249 | huft_t *u[BMAX]; /* table stack */ |
| 250 | unsigned v[N_MAX]; /* values in order of bit length */ |
| 251 | register int w; /* bits before this table == (l * h) */ |
| 252 | unsigned x[BMAX + 1]; /* bit offsets, then code stack */ |
| 253 | unsigned *xp; /* pointer into x */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 254 | int y; /* number of dummy codes added */ |
| 255 | unsigned z; /* number of entries in current table */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 256 | |
| 257 | /* Generate counts for each bit length */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 258 | memset((void *) (c), 0, sizeof(c)); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 259 | p = b; |
| 260 | i = n; |
| 261 | do { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 262 | c[*p]++; /* assume all entries <= BMAX */ |
| 263 | p++; /* Can't combine with above line (Solaris bug) */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 264 | } while (--i); |
| 265 | if (c[0] == n) { /* null input--all zero length codes */ |
| 266 | *t = (huft_t *) NULL; |
| 267 | *m = 0; |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | /* Find minimum and maximum length, bound *m by those */ |
| 272 | l = *m; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 273 | for (j = 1; j <= BMAX; j++) { |
| 274 | if (c[j]) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 275 | break; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 276 | } |
| 277 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 278 | k = j; /* minimum code length */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 279 | if ((unsigned) l < j) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 280 | l = j; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 281 | } |
| 282 | for (i = BMAX; i; i--) { |
| 283 | if (c[i]) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 284 | break; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 285 | } |
| 286 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 287 | g = i; /* maximum code length */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 288 | if ((unsigned) l > i) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 289 | l = i; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 290 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 291 | *m = l; |
| 292 | |
| 293 | /* Adjust last length count to fill out codes, if needed */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 294 | for (y = 1 << j; j < i; j++, y <<= 1) { |
| 295 | if ((y -= c[j]) < 0) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 296 | return 2; /* bad input: more codes than bits */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 297 | } |
| 298 | } |
| 299 | if ((y -= c[i]) < 0) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 300 | return 2; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 301 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 302 | c[i] += y; |
| 303 | |
| 304 | /* Generate starting offsets into the value table for each length */ |
| 305 | x[1] = j = 0; |
| 306 | p = c + 1; |
| 307 | xp = x + 2; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 308 | while (--i) { /* note that i == g from above */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 309 | *xp++ = (j += *p++); |
| 310 | } |
| 311 | |
| 312 | /* Make a table of values in order of bit lengths */ |
| 313 | p = b; |
| 314 | i = 0; |
| 315 | do { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 316 | if ((j = *p++) != 0) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 317 | v[x[j]++] = i; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 318 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 319 | } while (++i < n); |
| 320 | |
| 321 | /* Generate the Huffman codes and for each, make the table entries */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 322 | x[0] = i = 0; /* first Huffman code is zero */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 323 | p = v; /* grab values in bit order */ |
| 324 | h = -1; /* no tables yet--level -1 */ |
| 325 | w = -l; /* bits decoded == (l * h) */ |
| 326 | u[0] = (huft_t *) NULL; /* just to keep compilers happy */ |
| 327 | q = (huft_t *) NULL; /* ditto */ |
| 328 | z = 0; /* ditto */ |
| 329 | |
| 330 | /* go through the bit lengths (k already is bits in shortest code) */ |
| 331 | for (; k <= g; k++) { |
| 332 | a = c[k]; |
| 333 | while (a--) { |
| 334 | /* here i is the Huffman code of length k bits for value *p */ |
| 335 | /* make tables up to required level */ |
| 336 | while (k > w + l) { |
| 337 | h++; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 338 | w += l; /* previous table always l bits */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 339 | |
| 340 | /* compute minimum size table less than or equal to l bits */ |
| 341 | z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */ |
| 342 | if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ |
| 343 | f -= a + 1; /* deduct codes from patterns left */ |
| 344 | xp = c + k; |
| 345 | while (++j < z) { /* try smaller tables up to z bits */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 346 | if ((f <<= 1) <= *++xp) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 347 | break; /* enough codes to use up j bits */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 348 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 349 | f -= *xp; /* else deduct codes from patterns */ |
| 350 | } |
| 351 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 352 | z = 1 << j; /* table entries for j-bit table */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 353 | |
| 354 | /* allocate and link in new table */ |
Glenn L McGrath | 249f39a | 2001-12-05 16:01:02 +0000 | [diff] [blame] | 355 | q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t)); |
| 356 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 357 | *t = q + 1; /* link to list for huft_free() */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 358 | *(t = &(q->v.t)) = NULL; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 359 | u[h] = ++q; /* table starts after link */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 360 | |
| 361 | /* connect to last table, if there is one */ |
| 362 | if (h) { |
| 363 | x[h] = i; /* save pattern for backing up */ |
| 364 | r.b = (unsigned char) l; /* bits to dump before this table */ |
| 365 | r.e = (unsigned char) (16 + j); /* bits in this table */ |
| 366 | r.v.t = q; /* pointer to this table */ |
| 367 | j = i >> (w - l); /* (get around Turbo C bug) */ |
| 368 | u[h - 1][j] = r; /* connect to last table */ |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* set up table entry in r */ |
| 373 | r.b = (unsigned char) (k - w); |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 374 | if (p >= v + n) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 375 | r.e = 99; /* out of values--invalid code */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 376 | } else if (*p < s) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 377 | r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ |
| 378 | r.v.n = (unsigned short) (*p); /* simple code is just the value */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 379 | p++; /* one compiler does not like *p++ */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 380 | } else { |
| 381 | r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */ |
| 382 | r.v.n = d[*p++ - s]; |
| 383 | } |
| 384 | |
| 385 | /* fill code-like entries with r */ |
| 386 | f = 1 << (k - w); |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 387 | for (j = i >> w; j < z; j += f) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 388 | q[j] = r; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 389 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 390 | |
| 391 | /* backwards increment the k-bit code i */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 392 | for (j = 1 << (k - 1); i & j; j >>= 1) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 393 | i ^= j; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 394 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 395 | i ^= j; |
| 396 | |
| 397 | /* backup over finished tables */ |
| 398 | while ((i & ((1 << w) - 1)) != x[h]) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 399 | h--; /* don't need to update q */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 400 | w -= l; |
| 401 | } |
| 402 | } |
| 403 | } |
| 404 | /* Return true (1) if we were given an incomplete table */ |
| 405 | return y != 0 && g != 1; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * inflate (decompress) the codes in a deflated (compressed) block. |
| 410 | * Return an error code or zero if it all goes ok. |
| 411 | * |
| 412 | * tl, td: literal/length and distance decoder tables |
| 413 | * bl, bd: number of bits decoded by tl[] and td[] |
| 414 | */ |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 415 | static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned int my_bl, const unsigned int my_bd, int setup) |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 416 | { |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 417 | static unsigned int e; /* table entry flag/number of extra bits */ |
| 418 | static unsigned int n, d; /* length and index for copy */ |
| 419 | static unsigned int w; /* current gunzip_window position */ |
| 420 | static huft_t *t; /* pointer to table entry */ |
| 421 | static unsigned int ml, md; /* masks for bl and bd bits */ |
| 422 | static unsigned int b; /* bit buffer */ |
| 423 | static unsigned int k; /* number of bits in bit buffer */ |
| 424 | static huft_t *tl, *td; |
| 425 | static unsigned int bl, bd; |
| 426 | static int resumeCopy = 0; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 427 | |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 428 | if (setup) { // 1st time we are called, copy in variables |
| 429 | tl = my_tl; |
| 430 | td = my_td; |
| 431 | bl = my_bl; |
| 432 | bd = my_bd; |
| 433 | /* make local copies of globals */ |
| 434 | b = gunzip_bb; /* initialize bit buffer */ |
| 435 | k = gunzip_bk; |
| 436 | w = gunzip_outbuf_count; /* initialize gunzip_window position */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 437 | |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 438 | /* inflate the coded data */ |
| 439 | ml = mask_bits[bl]; /* precompute masks for speed */ |
| 440 | md = mask_bits[bd]; |
| 441 | return 0; // Don't actually do anything the first time |
| 442 | } |
| 443 | |
| 444 | if (resumeCopy) goto do_copy; |
| 445 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 446 | while (1) { /* do until end of block */ |
| 447 | b = fill_bitbuffer(b, &k, bl); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 448 | if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 449 | do { |
| 450 | if (e == 99) { |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 451 | error_msg_and_die("inflate_codes error 1");; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 452 | } |
| 453 | b >>= t->b; |
| 454 | k -= t->b; |
| 455 | e -= 16; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 456 | b = fill_bitbuffer(b, &k, e); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 457 | } while ((e = |
| 458 | (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 459 | b >>= t->b; |
| 460 | k -= t->b; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 461 | if (e == 16) { /* then it's a literal */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 462 | gunzip_window[w++] = (unsigned char) t->v.n; |
| 463 | if (w == gunzip_wsize) { |
| 464 | gunzip_outbuf_count = (w); |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 465 | //flush_gunzip_window(); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 466 | w = 0; |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 467 | return 1; // We have a block to read |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 468 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 469 | } else { /* it's an EOB or a length */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 470 | |
| 471 | /* exit if end of block */ |
| 472 | if (e == 15) { |
| 473 | break; |
| 474 | } |
| 475 | |
| 476 | /* get length of block to copy */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 477 | b = fill_bitbuffer(b, &k, e); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 478 | n = t->v.n + ((unsigned) b & mask_bits[e]); |
| 479 | b >>= e; |
| 480 | k -= e; |
| 481 | |
| 482 | /* decode distance of block to copy */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 483 | b = fill_bitbuffer(b, &k, bd); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 484 | if ((e = (t = td + ((unsigned) b & md))->e) > 16) |
| 485 | do { |
| 486 | if (e == 99) |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 487 | error_msg_and_die("inflate_codes error 2");; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 488 | b >>= t->b; |
| 489 | k -= t->b; |
| 490 | e -= 16; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 491 | b = fill_bitbuffer(b, &k, e); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 492 | } while ((e = |
| 493 | (t = |
| 494 | t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 495 | b >>= t->b; |
| 496 | k -= t->b; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 497 | b = fill_bitbuffer(b, &k, e); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 498 | d = w - t->v.n - ((unsigned) b & mask_bits[e]); |
| 499 | b >>= e; |
| 500 | k -= e; |
| 501 | |
| 502 | /* do the copy */ |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 503 | do_copy: do { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 504 | n -= (e = |
| 505 | (e = |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 506 | gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e); |
| 507 | /* copy to new buffer to prevent possible overwrite */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 508 | if (w - d >= e) { /* (this test assumes unsigned comparison) */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 509 | memcpy(gunzip_window + w, gunzip_window + d, e); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 510 | w += e; |
| 511 | d += e; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 512 | } else { |
| 513 | /* do it slow to avoid memcpy() overlap */ |
| 514 | /* !NOMEMCPY */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 515 | do { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 516 | gunzip_window[w++] = gunzip_window[d++]; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 517 | } while (--e); |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 518 | } |
| 519 | if (w == gunzip_wsize) { |
| 520 | gunzip_outbuf_count = (w); |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 521 | if (n) resumeCopy = 1; |
| 522 | else resumeCopy = 0; |
| 523 | //flush_gunzip_window(); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 524 | w = 0; |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 525 | return 1; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 526 | } |
| 527 | } while (n); |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 528 | resumeCopy = 0; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 529 | } |
| 530 | } |
| 531 | |
| 532 | /* restore the globals from the locals */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 533 | gunzip_outbuf_count = w; /* restore global gunzip_window pointer */ |
| 534 | gunzip_bb = b; /* restore global bit buffer */ |
| 535 | gunzip_bk = k; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 536 | |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 537 | /* normally just after call to inflate_codes, but save code by putting it here */ |
| 538 | /* free the decoding tables, return */ |
| 539 | huft_free(tl); |
| 540 | huft_free(td); |
| 541 | |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 542 | /* done */ |
| 543 | return 0; |
| 544 | } |
| 545 | |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 546 | static int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup) |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 547 | { |
| 548 | static int n, b_stored, k_stored, w; |
| 549 | if (setup) { |
| 550 | n = my_n; |
| 551 | b_stored = my_b_stored; |
| 552 | k_stored = my_k_stored; |
| 553 | w = gunzip_outbuf_count; /* initialize gunzip_window position */ |
| 554 | return 0; // Don't do anything first time |
| 555 | } |
| 556 | |
| 557 | /* read and output the compressed data */ |
| 558 | while (n--) { |
| 559 | b_stored = fill_bitbuffer(b_stored, &k_stored, 8); |
| 560 | gunzip_window[w++] = (unsigned char) b_stored; |
| 561 | if (w == (unsigned int) gunzip_wsize) { |
| 562 | gunzip_outbuf_count = (w); |
| 563 | //flush_gunzip_window(); |
| 564 | w = 0; |
| 565 | b_stored >>= 8; |
| 566 | k_stored -= 8; |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 567 | return 1; // We have a block |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 568 | } |
| 569 | b_stored >>= 8; |
| 570 | k_stored -= 8; |
| 571 | } |
| 572 | |
| 573 | /* restore the globals from the locals */ |
| 574 | gunzip_outbuf_count = w; /* restore global gunzip_window pointer */ |
| 575 | gunzip_bb = b_stored; /* restore global bit buffer */ |
| 576 | gunzip_bk = k_stored; |
| 577 | return 0; // Finished |
| 578 | } |
| 579 | |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 580 | /* |
| 581 | * decompress an inflated block |
| 582 | * e: last block flag |
| 583 | * |
| 584 | * GLOBAL VARIABLES: bb, kk, |
| 585 | */ |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 586 | // Return values: -1 = inflate_stored, -2 = inflate_codes |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 587 | static int inflate_block(int *e) |
| 588 | { |
| 589 | unsigned t; /* block type */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 590 | register unsigned int b; /* bit buffer */ |
| 591 | unsigned int k; /* number of bits in bit buffer */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 592 | |
| 593 | /* make local bit buffer */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 594 | |
| 595 | b = gunzip_bb; |
| 596 | k = gunzip_bk; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 597 | |
| 598 | /* read in last block bit */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 599 | b = fill_bitbuffer(b, &k, 1); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 600 | *e = (int) b & 1; |
| 601 | b >>= 1; |
| 602 | k -= 1; |
| 603 | |
| 604 | /* read in block type */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 605 | b = fill_bitbuffer(b, &k, 2); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 606 | t = (unsigned) b & 3; |
| 607 | b >>= 2; |
| 608 | k -= 2; |
| 609 | |
| 610 | /* restore the global bit buffer */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 611 | gunzip_bb = b; |
| 612 | gunzip_bk = k; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 613 | |
| 614 | /* inflate that block type */ |
| 615 | switch (t) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 616 | case 0: /* Inflate stored */ |
| 617 | { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 618 | unsigned int n; /* number of bytes in block */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 619 | unsigned int b_stored; /* bit buffer */ |
| 620 | unsigned int k_stored; /* number of bits in bit buffer */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 621 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 622 | /* make local copies of globals */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 623 | b_stored = gunzip_bb; /* initialize bit buffer */ |
| 624 | k_stored = gunzip_bk; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 625 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 626 | /* go to byte boundary */ |
| 627 | n = k_stored & 7; |
| 628 | b_stored >>= n; |
| 629 | k_stored -= n; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 630 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 631 | /* get the length and its complement */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 632 | b_stored = fill_bitbuffer(b_stored, &k_stored, 16); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 633 | n = ((unsigned) b_stored & 0xffff); |
| 634 | b_stored >>= 16; |
| 635 | k_stored -= 16; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 636 | |
| 637 | b_stored = fill_bitbuffer(b_stored, &k_stored, 16); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 638 | if (n != (unsigned) ((~b_stored) & 0xffff)) { |
| 639 | return 1; /* error in compressed data */ |
| 640 | } |
| 641 | b_stored >>= 16; |
| 642 | k_stored -= 16; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 643 | |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 644 | inflate_stored(n, b_stored, k_stored, 1); // Setup inflate_stored |
| 645 | return -1; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 646 | } |
| 647 | case 1: /* Inflate fixed |
| 648 | * decompress an inflated type 1 (fixed Huffman codes) block. We should |
| 649 | * either replace this with a custom decoder, or at least precompute the |
| 650 | * Huffman tables. |
| 651 | */ |
| 652 | { |
| 653 | int i; /* temporary variable */ |
| 654 | huft_t *tl; /* literal/length code table */ |
| 655 | huft_t *td; /* distance code table */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 656 | unsigned int bl; /* lookup bits for tl */ |
| 657 | unsigned int bd; /* lookup bits for td */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 658 | unsigned int l[288]; /* length list for huft_build */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 659 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 660 | /* set up literal table */ |
| 661 | for (i = 0; i < 144; i++) { |
| 662 | l[i] = 8; |
| 663 | } |
| 664 | for (; i < 256; i++) { |
| 665 | l[i] = 9; |
| 666 | } |
| 667 | for (; i < 280; i++) { |
| 668 | l[i] = 7; |
| 669 | } |
| 670 | for (; i < 288; i++) { /* make a complete, but wrong code set */ |
| 671 | l[i] = 8; |
| 672 | } |
| 673 | bl = 7; |
| 674 | if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0) { |
| 675 | return i; |
| 676 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 677 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 678 | /* set up distance table */ |
| 679 | for (i = 0; i < 30; i++) { /* make an incomplete code set */ |
| 680 | l[i] = 5; |
| 681 | } |
| 682 | bd = 5; |
| 683 | if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 684 | huft_free(tl); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 685 | return i; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 686 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 687 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 688 | /* decompress until an end-of-block code */ |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 689 | inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes |
| 690 | |
| 691 | /* huft_free code moved into inflate_codes */ |
| 692 | |
| 693 | return -2; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 694 | } |
| 695 | case 2: /* Inflate dynamic */ |
| 696 | { |
| 697 | const int dbits = 6; /* bits in base distance lookup table */ |
| 698 | const int lbits = 9; /* bits in base literal/length lookup table */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 699 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 700 | huft_t *tl; /* literal/length code table */ |
| 701 | huft_t *td; /* distance code table */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 702 | unsigned int i; /* temporary variables */ |
| 703 | unsigned int j; |
| 704 | unsigned int l; /* last length */ |
| 705 | unsigned int m; /* mask for bit lengths table */ |
| 706 | unsigned int n; /* number of lengths to get */ |
| 707 | unsigned int bl; /* lookup bits for tl */ |
| 708 | unsigned int bd; /* lookup bits for td */ |
| 709 | unsigned int nb; /* number of bit length codes */ |
| 710 | unsigned int nl; /* number of literal/length codes */ |
| 711 | unsigned int nd; /* number of distance codes */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 712 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 713 | unsigned int ll[286 + 30]; /* literal/length and distance code lengths */ |
| 714 | unsigned int b_dynamic; /* bit buffer */ |
| 715 | unsigned int k_dynamic; /* number of bits in bit buffer */ |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 716 | |
| 717 | /* make local bit buffer */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 718 | b_dynamic = gunzip_bb; |
| 719 | k_dynamic = gunzip_bk; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 720 | |
| 721 | /* read in table lengths */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 722 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5); |
| 723 | nl = 257 + ((unsigned int) b_dynamic & 0x1f); /* number of literal/length codes */ |
| 724 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 725 | b_dynamic >>= 5; |
| 726 | k_dynamic -= 5; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 727 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5); |
| 728 | nd = 1 + ((unsigned int) b_dynamic & 0x1f); /* number of distance codes */ |
| 729 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 730 | b_dynamic >>= 5; |
| 731 | k_dynamic -= 5; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 732 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 4); |
| 733 | nb = 4 + ((unsigned int) b_dynamic & 0xf); /* number of bit length codes */ |
| 734 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 735 | b_dynamic >>= 4; |
| 736 | k_dynamic -= 4; |
| 737 | if (nl > 286 || nd > 30) { |
| 738 | return 1; /* bad lengths */ |
| 739 | } |
| 740 | |
| 741 | /* read in bit-length-code lengths */ |
| 742 | for (j = 0; j < nb; j++) { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 743 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3); |
| 744 | ll[border[j]] = (unsigned int) b_dynamic & 7; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 745 | b_dynamic >>= 3; |
| 746 | k_dynamic -= 3; |
| 747 | } |
| 748 | for (; j < 19; j++) { |
| 749 | ll[border[j]] = 0; |
| 750 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 751 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 752 | /* build decoding table for trees--single level, 7 bit lookup */ |
| 753 | bl = 7; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 754 | i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl); |
| 755 | if (i != 0) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 756 | if (i == 1) { |
| 757 | huft_free(tl); |
| 758 | } |
| 759 | return i; /* incomplete code set */ |
| 760 | } |
| 761 | |
| 762 | /* read in literal and distance code lengths */ |
| 763 | n = nl + nd; |
| 764 | m = mask_bits[bl]; |
| 765 | i = l = 0; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 766 | while ((unsigned int) i < n) { |
| 767 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, (unsigned int)bl); |
| 768 | j = (td = tl + ((unsigned int) b_dynamic & m))->b; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 769 | b_dynamic >>= j; |
| 770 | k_dynamic -= j; |
| 771 | j = td->v.n; |
| 772 | if (j < 16) { /* length of code in bits (0..15) */ |
| 773 | ll[i++] = l = j; /* save last length in l */ |
| 774 | } else if (j == 16) { /* repeat last length 3 to 6 times */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 775 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 2); |
| 776 | j = 3 + ((unsigned int) b_dynamic & 3); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 777 | b_dynamic >>= 2; |
| 778 | k_dynamic -= 2; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 779 | if ((unsigned int) i + j > n) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 780 | return 1; |
| 781 | } |
| 782 | while (j--) { |
| 783 | ll[i++] = l; |
| 784 | } |
| 785 | } else if (j == 17) { /* 3 to 10 zero length codes */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 786 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3); |
| 787 | j = 3 + ((unsigned int) b_dynamic & 7); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 788 | b_dynamic >>= 3; |
| 789 | k_dynamic -= 3; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 790 | if ((unsigned int) i + j > n) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 791 | return 1; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 792 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 793 | while (j--) { |
| 794 | ll[i++] = 0; |
| 795 | } |
| 796 | l = 0; |
| 797 | } else { /* j == 18: 11 to 138 zero length codes */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 798 | b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 7); |
| 799 | j = 11 + ((unsigned int) b_dynamic & 0x7f); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 800 | b_dynamic >>= 7; |
| 801 | k_dynamic -= 7; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 802 | if ((unsigned int) i + j > n) { |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 803 | return 1; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 804 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 805 | while (j--) { |
| 806 | ll[i++] = 0; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 807 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 808 | l = 0; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 809 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 810 | } |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 811 | |
| 812 | /* free decoding table for trees */ |
| 813 | huft_free(tl); |
| 814 | |
| 815 | /* restore the global bit buffer */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 816 | gunzip_bb = b_dynamic; |
| 817 | gunzip_bk = k_dynamic; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 818 | |
| 819 | /* build the decoding tables for literal/length and distance codes */ |
| 820 | bl = lbits; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 821 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 822 | if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) { |
| 823 | if (i == 1) { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 824 | error_msg_and_die("Incomplete literal tree"); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 825 | huft_free(tl); |
| 826 | } |
| 827 | return i; /* incomplete code set */ |
| 828 | } |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 829 | |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 830 | bd = dbits; |
| 831 | if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) { |
| 832 | if (i == 1) { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 833 | error_msg_and_die("incomplete distance tree"); |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 834 | huft_free(td); |
| 835 | } |
| 836 | huft_free(tl); |
| 837 | return i; /* incomplete code set */ |
| 838 | } |
| 839 | |
| 840 | /* decompress until an end-of-block code */ |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 841 | inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 842 | |
Glenn L McGrath | 0126fda | 2002-11-20 06:46:46 +0000 | [diff] [blame] | 843 | /* huft_free code moved into inflate_codes */ |
| 844 | |
| 845 | return -2; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 846 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 847 | default: |
| 848 | /* bad block type */ |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 849 | error_msg_and_die("bad block type %d\n", t); |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | static void calculate_gunzip_crc(void) |
| 854 | { |
| 855 | int n; |
| 856 | for (n = 0; n < gunzip_outbuf_count; n++) { |
| 857 | gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8); |
| 858 | } |
| 859 | gunzip_bytes_out += gunzip_outbuf_count; |
| 860 | } |
| 861 | |
| 862 | static int inflate_get_next_window(void) |
| 863 | { |
| 864 | static int needAnotherBlock = 1; |
| 865 | static int method = -1; // Method == -1 for stored, -2 for codes |
| 866 | static int e = 0; |
| 867 | |
| 868 | gunzip_outbuf_count = 0; |
| 869 | |
| 870 | while(1) { |
| 871 | int ret; |
| 872 | |
| 873 | if (needAnotherBlock) { |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 874 | if(e) { |
| 875 | calculate_gunzip_crc(); |
| 876 | return 0; |
| 877 | } // Last block |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 878 | method = inflate_block(&e); |
| 879 | needAnotherBlock = 0; |
| 880 | } |
| 881 | |
| 882 | switch (method) { |
| 883 | case -1: ret = inflate_stored(0,0,0,0); |
| 884 | break; |
| 885 | case -2: ret = inflate_codes(0,0,0,0,0); |
| 886 | break; |
| 887 | default: error_msg_and_die("inflate error %d", method); |
| 888 | } |
| 889 | |
| 890 | if (ret == 1) { |
| 891 | calculate_gunzip_crc(); |
| 892 | return 1; // More data left |
| 893 | } else needAnotherBlock = 1; // End of that block |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 894 | } |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 895 | /* Doesnt get here */ |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | /* |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 899 | * User functions |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 900 | * |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 901 | * read_gz, GZ_gzReadOpen, GZ_gzReadClose, inflate |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 902 | */ |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 903 | |
| 904 | extern ssize_t read_gz(int fd, void *buf, size_t count) |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 905 | { |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 906 | static int morebytes = 0, finished = 0; |
| 907 | |
| 908 | if (morebytes) { |
| 909 | int bytesRead = morebytes > count ? count : morebytes; |
| 910 | memcpy(buf, gunzip_window + (gunzip_outbuf_count - morebytes), bytesRead); |
| 911 | morebytes -= bytesRead; |
| 912 | return bytesRead; |
| 913 | } else if (finished) { |
| 914 | return 0; |
| 915 | } else if (count >= 0x8000) { // We can decompress direcly to the buffer, 32k at a time |
| 916 | // Could decompress to larger buffer, but it must be a power of 2, and calculating that is probably more expensive than the benefit |
| 917 | unsigned char *old_gunzip_window = gunzip_window; // Save old window |
| 918 | gunzip_window = buf; |
| 919 | if (inflate_get_next_window() == 0) finished = 1; |
| 920 | gunzip_window = old_gunzip_window; // Restore old window |
| 921 | return gunzip_outbuf_count; |
| 922 | } else { // Oh well, need to split up the gunzip_window |
| 923 | int bytesRead; |
| 924 | if (inflate_get_next_window() == 0) finished = 1; |
| 925 | morebytes = gunzip_outbuf_count; |
| 926 | bytesRead = morebytes > count ? count : morebytes; |
| 927 | memcpy(buf, gunzip_window, bytesRead); |
| 928 | morebytes -= bytesRead; |
| 929 | return bytesRead; |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 930 | } |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 931 | |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | extern void GZ_gzReadOpen(int fd, void *unused, int nUnused) |
| 935 | { |
| 936 | typedef void (*sig_type) (int); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 937 | |
Glenn L McGrath | 87ac702 | 2002-01-02 13:52:26 +0000 | [diff] [blame] | 938 | /* Allocate all global buffers (for DYN_ALLOC option) */ |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 939 | gunzip_window = xmalloc(gunzip_wsize); |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 940 | gunzip_outbuf_count = 0; |
| 941 | gunzip_bytes_out = 0; |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 942 | gunzip_src_fd = fd; |
Glenn L McGrath | 249f39a | 2001-12-05 16:01:02 +0000 | [diff] [blame] | 943 | |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 944 | /* Input buffer */ |
| 945 | bytebuffer = xmalloc(BYTEBUFFER_MAX); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 946 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 947 | /* initialize gunzip_window, bit buffer */ |
| 948 | gunzip_bk = 0; |
| 949 | gunzip_bb = 0; |
Glenn L McGrath | 9fef17d | 2002-08-22 18:41:20 +0000 | [diff] [blame] | 950 | |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 951 | /* Create the crc table */ |
| 952 | make_gunzip_crc_table(); |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 953 | } |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 954 | |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 955 | extern void GZ_gzReadClose(void) |
| 956 | { |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 957 | /* Cleanup */ |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 958 | free(gunzip_window); |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 959 | free(gunzip_crc_table); |
| 960 | |
| 961 | /* Store unused bytes in a global buffer so calling applets can access it */ |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 962 | if (gunzip_bk >= 8) { |
| 963 | /* Undo too much lookahead. The next read will be byte aligned |
| 964 | * so we can discard unused bits in the last meaningful byte. */ |
Glenn L McGrath | eda4f53 | 2002-11-24 06:01:20 +0000 | [diff] [blame] | 965 | bytebuffer_offset--; |
| 966 | bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff; |
Glenn L McGrath | 7ca04f3 | 2002-09-25 02:47:48 +0000 | [diff] [blame] | 967 | gunzip_bb >>= 8; |
| 968 | gunzip_bk -= 8; |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 969 | } |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 970 | } |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 971 | |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 972 | /*extern int inflate(int in, int out) // Useful for testing read_gz |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 973 | { |
| 974 | char buf[8192]; |
| 975 | ssize_t nread, nwrote; |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 976 | |
| 977 | GZ_gzReadOpen(in, 0, 0); |
| 978 | while(1) { // Robbed from copyfd.c |
| 979 | nread = read_gz(in, buf, sizeof(buf)); |
| 980 | if (nread == 0) break; // no data to write |
| 981 | else if (nread == -1) { |
| 982 | perror_msg("read"); |
| 983 | return -1; |
| 984 | } |
| 985 | nwrote = full_write(out, buf, nread); |
| 986 | if (nwrote == -1) { |
| 987 | perror_msg("write"); |
| 988 | return -1; |
| 989 | } |
Glenn L McGrath | 83bf47c | 2002-11-20 22:00:31 +0000 | [diff] [blame] | 990 | } |
| 991 | GZ_gzReadClose(); |
| 992 | return 0; |
| 993 | }*/ |
| 994 | |
| 995 | extern int inflate(int in, int out) |
| 996 | { |
| 997 | ssize_t nwrote; |
| 998 | GZ_gzReadOpen(in, 0, 0); |
| 999 | while(1) { |
| 1000 | int ret = inflate_get_next_window(); |
| 1001 | nwrote = full_write(out, gunzip_window, gunzip_outbuf_count); |
| 1002 | if (nwrote == -1) { |
| 1003 | perror_msg("write"); |
| 1004 | return -1; |
| 1005 | } |
| 1006 | if (ret == 0) break; |
Glenn L McGrath | fd73b8c | 2002-11-17 21:33:30 +0000 | [diff] [blame] | 1007 | } |
| 1008 | GZ_gzReadClose(); |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 1009 | return 0; |
| 1010 | } |
Glenn L McGrath | cc61692 | 2003-02-09 04:46:34 +0000 | [diff] [blame^] | 1011 | |
| 1012 | extern void check_trailer_gzip(int src_fd) |
| 1013 | { |
| 1014 | unsigned int stored_crc = 0; |
| 1015 | unsigned char count; |
| 1016 | |
| 1017 | /* top up the input buffer with the rest of the trailer */ |
| 1018 | count = bytebuffer_size - bytebuffer_offset; |
| 1019 | if (count < 8) { |
| 1020 | xread_all(src_fd, &bytebuffer[bytebuffer_size], 8 - count); |
| 1021 | bytebuffer_size += 8 - count; |
| 1022 | } |
| 1023 | for (count = 0; count != 4; count++) { |
| 1024 | stored_crc |= (bytebuffer[bytebuffer_offset] << (count * 8)); |
| 1025 | bytebuffer_offset++; |
| 1026 | } |
| 1027 | |
| 1028 | /* Validate decompression - crc */ |
| 1029 | if (stored_crc != (gunzip_crc ^ 0xffffffffL)) { |
| 1030 | error_msg_and_die("crc error"); |
| 1031 | } |
| 1032 | |
| 1033 | /* Validate decompression - size */ |
| 1034 | if (gunzip_bytes_out != |
| 1035 | (bytebuffer[bytebuffer_offset] | (bytebuffer[bytebuffer_offset+1] << 8) | |
| 1036 | (bytebuffer[bytebuffer_offset+2] << 16) | (bytebuffer[bytebuffer_offset+3] << 24))) { |
| 1037 | error_msg_and_die("Incorrect length, but crc is correct"); |
| 1038 | } |
| 1039 | |
| 1040 | } |