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| 1 /* gzio.c -- IO on .gz files | |
| 2 * Copyright (C) 1995-2005 Jean-loup Gailly. | |
| 3 * For conditions of distribution and use, see copyright notice in zlib.h | |
| 4 * | |
| 5 * Compile this file with -DNO_GZCOMPRESS to avoid the compression code. | |
| 6 */ | |
| 7 | |
| 8 /* @(#) $Id: gzio.c,v 3.7 2005/08/04 19:14:14 tor%cs.brown.edu Exp $ */ | |
| 9 | |
| 10 #include <stdio.h> | |
| 11 | |
| 12 #include "zutil.h" | |
| 13 | |
| 14 #ifdef NO_DEFLATE /* for compatibility with old definition */ | |
| 15 # define NO_GZCOMPRESS | |
| 16 #endif | |
| 17 | |
| 18 #ifndef NO_DUMMY_DECL | |
| 19 struct internal_state {int dummy;}; /* for buggy compilers */ | |
| 20 #endif | |
| 21 | |
| 22 #ifndef Z_BUFSIZE | |
| 23 # ifdef MAXSEG_64K | |
| 24 # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */ | |
| 25 # else | |
| 26 # define Z_BUFSIZE 16384 | |
| 27 # endif | |
| 28 #endif | |
| 29 #ifndef Z_PRINTF_BUFSIZE | |
| 30 # define Z_PRINTF_BUFSIZE 4096 | |
| 31 #endif | |
| 32 | |
| 33 #ifdef __MVS__ | |
| 34 # pragma map (fdopen , "\174\174FDOPEN") | |
| 35 FILE *fdopen(int, const char *); | |
| 36 #endif | |
| 37 | |
| 38 #ifndef STDC | |
| 39 extern voidp malloc OF((uInt size)); | |
| 40 extern void free OF((voidpf ptr)); | |
| 41 #endif | |
| 42 | |
| 43 #define ALLOC(size) malloc(size) | |
| 44 #define TRYFREE(p) {if (p) free(p);} | |
| 45 | |
| 46 static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ | |
| 47 | |
| 48 /* gzip flag byte */ | |
| 49 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ | |
| 50 #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ | |
| 51 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
| 52 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
| 53 #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
| 54 #define RESERVED 0xE0 /* bits 5..7: reserved */ | |
| 55 | |
| 56 typedef struct gz_stream { | |
| 57 z_stream stream; | |
| 58 int z_err; /* error code for last stream operation */ | |
| 59 int z_eof; /* set if end of input file */ | |
| 60 FILE *file; /* .gz file */ | |
| 61 Byte *inbuf; /* input buffer */ | |
| 62 Byte *outbuf; /* output buffer */ | |
| 63 uLong crc; /* crc32 of uncompressed data */ | |
| 64 char *msg; /* error message */ | |
| 65 char *path; /* path name for debugging only */ | |
| 66 int transparent; /* 1 if input file is not a .gz file */ | |
| 67 char mode; /* 'w' or 'r' */ | |
| 68 z_off_t start; /* start of compressed data in file (header skipped) */ | |
| 69 z_off_t in; /* bytes into deflate or inflate */ | |
| 70 z_off_t out; /* bytes out of deflate or inflate */ | |
| 71 int back; /* one character push-back */ | |
| 72 int last; /* true if push-back is last character */ | |
| 73 } gz_stream; | |
| 74 | |
| 75 | |
| 76 local gzFile gz_open OF((const char *path, const char *mode, int fd)); | |
| 77 #ifndef NO_GZCOMPRESS // Google Gears addition, to avoid compile warning | |
| 78 local int do_flush OF((gzFile file, int flush)); | |
| 79 #endif | |
| 80 local int get_byte OF((gz_stream *s)); | |
| 81 local void check_header OF((gz_stream *s)); | |
| 82 local int destroy OF((gz_stream *s)); | |
| 83 #ifndef NO_GZCOMPRESS // Google Gears addition, to avoid compile warning | |
| 84 local void putLong OF((FILE *file, uLong x)); | |
| 85 #endif | |
| 86 local uLong getLong OF((gz_stream *s)); | |
| 87 | |
| 88 /* =========================================================================== | |
| 89 Opens a gzip (.gz) file for reading or writing. The mode parameter | |
| 90 is as in fopen ("rb" or "wb"). The file is given either by file descriptor | |
| 91 or path name (if fd == -1). | |
| 92 gz_open returns NULL if the file could not be opened or if there was | |
| 93 insufficient memory to allocate the (de)compression state; errno | |
| 94 can be checked to distinguish the two cases (if errno is zero, the | |
| 95 zlib error is Z_MEM_ERROR). | |
| 96 */ | |
| 97 local gzFile gz_open (path, mode, fd) | |
| 98 const char *path; | |
| 99 const char *mode; | |
| 100 int fd; | |
| 101 { | |
| 102 int err; | |
| 103 int level = Z_DEFAULT_COMPRESSION; /* compression level */ | |
| 104 int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */ | |
| 105 char *p = (char*)mode; | |
| 106 gz_stream *s; | |
| 107 char fmode[80]; /* copy of mode, without the compression level */ | |
| 108 char *m = fmode; | |
| 109 | |
| 110 if (!path || !mode) return Z_NULL; | |
| 111 | |
| 112 s = (gz_stream *)ALLOC(sizeof(gz_stream)); | |
| 113 if (!s) return Z_NULL; | |
| 114 | |
| 115 s->stream.zalloc = (alloc_func)0; | |
| 116 s->stream.zfree = (free_func)0; | |
| 117 s->stream.opaque = (voidpf)0; | |
| 118 s->stream.next_in = s->inbuf = Z_NULL; | |
| 119 s->stream.next_out = s->outbuf = Z_NULL; | |
| 120 s->stream.avail_in = s->stream.avail_out = 0; | |
| 121 s->file = NULL; | |
| 122 s->z_err = Z_OK; | |
| 123 s->z_eof = 0; | |
| 124 s->in = 0; | |
| 125 s->out = 0; | |
| 126 s->back = EOF; | |
| 127 s->crc = crc32(0L, Z_NULL, 0); | |
| 128 s->msg = NULL; | |
| 129 s->transparent = 0; | |
| 130 | |
| 131 s->path = (char*)ALLOC(strlen(path)+1); | |
| 132 if (s->path == NULL) { | |
| 133 return destroy(s), (gzFile)Z_NULL; | |
| 134 } | |
| 135 strcpy(s->path, path); /* do this early for debugging */ | |
| 136 | |
| 137 s->mode = '\0'; | |
| 138 do { | |
| 139 if (*p == 'r') s->mode = 'r'; | |
| 140 if (*p == 'w' || *p == 'a') s->mode = 'w'; | |
| 141 if (*p >= '0' && *p <= '9') { | |
| 142 level = *p - '0'; | |
| 143 } else if (*p == 'f') { | |
| 144 strategy = Z_FILTERED; | |
| 145 } else if (*p == 'h') { | |
| 146 strategy = Z_HUFFMAN_ONLY; | |
| 147 } else if (*p == 'R') { | |
| 148 strategy = Z_RLE; | |
| 149 } else { | |
| 150 *m++ = *p; /* copy the mode */ | |
| 151 } | |
| 152 } while (*p++ && m != fmode + sizeof(fmode)); | |
| 153 if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL; | |
| 154 | |
| 155 if (s->mode == 'w') { | |
| 156 #ifdef NO_GZCOMPRESS | |
| 157 err = Z_STREAM_ERROR; | |
| 158 #else | |
| 159 err = deflateInit2(&(s->stream), level, | |
| 160 Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy); | |
| 161 /* windowBits is passed < 0 to suppress zlib header */ | |
| 162 | |
| 163 s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
| 164 #endif | |
| 165 if (err != Z_OK || s->outbuf == Z_NULL) { | |
| 166 return destroy(s), (gzFile)Z_NULL; | |
| 167 } | |
| 168 } else { | |
| 169 s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
| 170 | |
| 171 err = inflateInit2(&(s->stream), -MAX_WBITS); | |
| 172 /* windowBits is passed < 0 to tell that there is no zlib header. | |
| 173 * Note that in this case inflate *requires* an extra "dummy" byte | |
| 174 * after the compressed stream in order to complete decompression and | |
| 175 * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are | |
| 176 * present after the compressed stream. | |
| 177 */ | |
| 178 if (err != Z_OK || s->inbuf == Z_NULL) { | |
| 179 return destroy(s), (gzFile)Z_NULL; | |
| 180 } | |
| 181 } | |
| 182 s->stream.avail_out = Z_BUFSIZE; | |
| 183 | |
| 184 errno = 0; | |
| 185 s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode); | |
| 186 | |
| 187 if (s->file == NULL) { | |
| 188 return destroy(s), (gzFile)Z_NULL; | |
| 189 } | |
| 190 if (s->mode == 'w') { | |
| 191 /* Write a very simple .gz header: | |
| 192 */ | |
| 193 fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1], | |
| 194 Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE); | |
| 195 s->start = 10L; | |
| 196 /* We use 10L instead of ftell(s->file) to because ftell causes an | |
| 197 * fflush on some systems. This version of the library doesn't use | |
| 198 * start anyway in write mode, so this initialization is not | |
| 199 * necessary. | |
| 200 */ | |
| 201 } else { | |
| 202 check_header(s); /* skip the .gz header */ | |
| 203 s->start = ftell(s->file) - s->stream.avail_in; | |
| 204 } | |
| 205 | |
| 206 return (gzFile)s; | |
| 207 } | |
| 208 | |
| 209 /* =========================================================================== | |
| 210 Opens a gzip (.gz) file for reading or writing. | |
| 211 */ | |
| 212 gzFile ZEXPORT gzopen (path, mode) | |
| 213 const char *path; | |
| 214 const char *mode; | |
| 215 { | |
| 216 return gz_open (path, mode, -1); | |
| 217 } | |
| 218 | |
| 219 /* =========================================================================== | |
| 220 Associate a gzFile with the file descriptor fd. fd is not dup'ed here | |
| 221 to mimic the behavio(u)r of fdopen. | |
| 222 */ | |
| 223 gzFile ZEXPORT gzdopen (fd, mode) | |
| 224 int fd; | |
| 225 const char *mode; | |
| 226 { | |
| 227 char name[46]; /* allow for up to 128-bit integers */ | |
| 228 | |
| 229 if (fd < 0) return (gzFile)Z_NULL; | |
| 230 sprintf(name, "<fd:%d>", fd); /* for debugging */ | |
| 231 | |
| 232 return gz_open (name, mode, fd); | |
| 233 } | |
| 234 | |
| 235 /* =========================================================================== | |
| 236 * Update the compression level and strategy | |
| 237 */ | |
| 238 int ZEXPORT gzsetparams (file, level, strategy) | |
| 239 gzFile file; | |
| 240 int level; | |
| 241 int strategy; | |
| 242 { | |
| 243 gz_stream *s = (gz_stream*)file; | |
| 244 | |
| 245 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
| 246 | |
| 247 /* Make room to allow flushing */ | |
| 248 if (s->stream.avail_out == 0) { | |
| 249 | |
| 250 s->stream.next_out = s->outbuf; | |
| 251 if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { | |
| 252 s->z_err = Z_ERRNO; | |
| 253 } | |
| 254 s->stream.avail_out = Z_BUFSIZE; | |
| 255 } | |
| 256 | |
| 257 return deflateParams (&(s->stream), level, strategy); | |
| 258 } | |
| 259 | |
| 260 /* =========================================================================== | |
| 261 Read a byte from a gz_stream; update next_in and avail_in. Return EOF | |
| 262 for end of file. | |
| 263 IN assertion: the stream s has been sucessfully opened for reading. | |
| 264 */ | |
| 265 local int get_byte(s) | |
| 266 gz_stream *s; | |
| 267 { | |
| 268 if (s->z_eof) return EOF; | |
| 269 if (s->stream.avail_in == 0) { | |
| 270 errno = 0; | |
| 271 s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); | |
| 272 if (s->stream.avail_in == 0) { | |
| 273 s->z_eof = 1; | |
| 274 if (ferror(s->file)) s->z_err = Z_ERRNO; | |
| 275 return EOF; | |
| 276 } | |
| 277 s->stream.next_in = s->inbuf; | |
| 278 } | |
| 279 s->stream.avail_in--; | |
| 280 return *(s->stream.next_in)++; | |
| 281 } | |
| 282 | |
| 283 /* =========================================================================== | |
| 284 Check the gzip header of a gz_stream opened for reading. Set the stream | |
| 285 mode to transparent if the gzip magic header is not present; set s->err | |
| 286 to Z_DATA_ERROR if the magic header is present but the rest of the header | |
| 287 is incorrect. | |
| 288 IN assertion: the stream s has already been created sucessfully; | |
| 289 s->stream.avail_in is zero for the first time, but may be non-zero | |
| 290 for concatenated .gz files. | |
| 291 */ | |
| 292 local void check_header(s) | |
| 293 gz_stream *s; | |
| 294 { | |
| 295 int method; /* method byte */ | |
| 296 int flags; /* flags byte */ | |
| 297 uInt len; | |
| 298 int c; | |
| 299 | |
| 300 /* Assure two bytes in the buffer so we can peek ahead -- handle case | |
| 301 where first byte of header is at the end of the buffer after the last | |
| 302 gzip segment */ | |
| 303 len = s->stream.avail_in; | |
| 304 if (len < 2) { | |
| 305 if (len) s->inbuf[0] = s->stream.next_in[0]; | |
| 306 errno = 0; | |
| 307 len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file); | |
| 308 if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO; | |
| 309 s->stream.avail_in += len; | |
| 310 s->stream.next_in = s->inbuf; | |
| 311 if (s->stream.avail_in < 2) { | |
| 312 s->transparent = s->stream.avail_in; | |
| 313 return; | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 /* Peek ahead to check the gzip magic header */ | |
| 318 if (s->stream.next_in[0] != gz_magic[0] || | |
| 319 s->stream.next_in[1] != gz_magic[1]) { | |
| 320 s->transparent = 1; | |
| 321 return; | |
| 322 } | |
| 323 s->stream.avail_in -= 2; | |
| 324 s->stream.next_in += 2; | |
| 325 | |
| 326 /* Check the rest of the gzip header */ | |
| 327 method = get_byte(s); | |
| 328 flags = get_byte(s); | |
| 329 if (method != Z_DEFLATED || (flags & RESERVED) != 0) { | |
| 330 s->z_err = Z_DATA_ERROR; | |
| 331 return; | |
| 332 } | |
| 333 | |
| 334 /* Discard time, xflags and OS code: */ | |
| 335 for (len = 0; len < 6; len++) (void)get_byte(s); | |
| 336 | |
| 337 if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */ | |
| 338 len = (uInt)get_byte(s); | |
| 339 len += ((uInt)get_byte(s))<<8; | |
| 340 /* len is garbage if EOF but the loop below will quit anyway */ | |
| 341 while (len-- != 0 && get_byte(s) != EOF) ; | |
| 342 } | |
| 343 if ((flags & ORIG_NAME) != 0) { /* skip the original file name */ | |
| 344 while ((c = get_byte(s)) != 0 && c != EOF) ; | |
| 345 } | |
| 346 if ((flags & COMMENT) != 0) { /* skip the .gz file comment */ | |
| 347 while ((c = get_byte(s)) != 0 && c != EOF) ; | |
| 348 } | |
| 349 if ((flags & HEAD_CRC) != 0) { /* skip the header crc */ | |
| 350 for (len = 0; len < 2; len++) (void)get_byte(s); | |
| 351 } | |
| 352 s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK; | |
| 353 } | |
| 354 | |
| 355 /* =========================================================================== | |
| 356 * Cleanup then free the given gz_stream. Return a zlib error code. | |
| 357 Try freeing in the reverse order of allocations. | |
| 358 */ | |
| 359 local int destroy (s) | |
| 360 gz_stream *s; | |
| 361 { | |
| 362 int err = Z_OK; | |
| 363 | |
| 364 if (!s) return Z_STREAM_ERROR; | |
| 365 | |
| 366 TRYFREE(s->msg); | |
| 367 | |
| 368 if (s->stream.state != NULL) { | |
| 369 if (s->mode == 'w') { | |
| 370 #ifdef NO_GZCOMPRESS | |
| 371 err = Z_STREAM_ERROR; | |
| 372 #else | |
| 373 err = deflateEnd(&(s->stream)); | |
| 374 #endif | |
| 375 } else if (s->mode == 'r') { | |
| 376 err = inflateEnd(&(s->stream)); | |
| 377 } | |
| 378 } | |
| 379 if (s->file != NULL && fclose(s->file)) { | |
| 380 #ifdef ESPIPE | |
| 381 if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */ | |
| 382 #endif | |
| 383 err = Z_ERRNO; | |
| 384 } | |
| 385 if (s->z_err < 0) err = s->z_err; | |
| 386 | |
| 387 TRYFREE(s->inbuf); | |
| 388 TRYFREE(s->outbuf); | |
| 389 TRYFREE(s->path); | |
| 390 TRYFREE(s); | |
| 391 return err; | |
| 392 } | |
| 393 | |
| 394 /* =========================================================================== | |
| 395 Reads the given number of uncompressed bytes from the compressed file. | |
| 396 gzread returns the number of bytes actually read (0 for end of file). | |
| 397 */ | |
| 398 int ZEXPORT gzread (file, buf, len) | |
| 399 gzFile file; | |
| 400 voidp buf; | |
| 401 unsigned len; | |
| 402 { | |
| 403 gz_stream *s = (gz_stream*)file; | |
| 404 Bytef *start = (Bytef*)buf; /* starting point for crc computation */ | |
| 405 Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ | |
| 406 | |
| 407 if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR; | |
| 408 | |
| 409 if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1; | |
| 410 if (s->z_err == Z_STREAM_END) return 0; /* EOF */ | |
| 411 | |
| 412 next_out = (Byte*)buf; | |
| 413 s->stream.next_out = (Bytef*)buf; | |
| 414 s->stream.avail_out = len; | |
| 415 | |
| 416 if (s->stream.avail_out && s->back != EOF) { | |
| 417 *next_out++ = s->back; | |
| 418 s->stream.next_out++; | |
| 419 s->stream.avail_out--; | |
| 420 s->back = EOF; | |
| 421 s->out++; | |
| 422 start++; | |
| 423 if (s->last) { | |
| 424 s->z_err = Z_STREAM_END; | |
| 425 return 1; | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 while (s->stream.avail_out != 0) { | |
| 430 | |
| 431 if (s->transparent) { | |
| 432 /* Copy first the lookahead bytes: */ | |
| 433 uInt n = s->stream.avail_in; | |
| 434 if (n > s->stream.avail_out) n = s->stream.avail_out; | |
| 435 if (n > 0) { | |
| 436 zmemcpy(s->stream.next_out, s->stream.next_in, n); | |
| 437 next_out += n; | |
| 438 s->stream.next_out = next_out; | |
| 439 s->stream.next_in += n; | |
| 440 s->stream.avail_out -= n; | |
| 441 s->stream.avail_in -= n; | |
| 442 } | |
| 443 if (s->stream.avail_out > 0) { | |
| 444 s->stream.avail_out -= | |
| 445 (uInt)fread(next_out, 1, s->stream.avail_out, s->file); | |
| 446 } | |
| 447 len -= s->stream.avail_out; | |
| 448 s->in += len; | |
| 449 s->out += len; | |
| 450 if (len == 0) s->z_eof = 1; | |
| 451 return (int)len; | |
| 452 } | |
| 453 if (s->stream.avail_in == 0 && !s->z_eof) { | |
| 454 | |
| 455 errno = 0; | |
| 456 s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); | |
| 457 if (s->stream.avail_in == 0) { | |
| 458 s->z_eof = 1; | |
| 459 if (ferror(s->file)) { | |
| 460 s->z_err = Z_ERRNO; | |
| 461 break; | |
| 462 } | |
| 463 } | |
| 464 s->stream.next_in = s->inbuf; | |
| 465 } | |
| 466 s->in += s->stream.avail_in; | |
| 467 s->out += s->stream.avail_out; | |
| 468 s->z_err = inflate(&(s->stream), Z_NO_FLUSH); | |
| 469 s->in -= s->stream.avail_in; | |
| 470 s->out -= s->stream.avail_out; | |
| 471 | |
| 472 if (s->z_err == Z_STREAM_END) { | |
| 473 /* Check CRC and original size */ | |
| 474 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); | |
| 475 start = s->stream.next_out; | |
| 476 | |
| 477 if (getLong(s) != s->crc) { | |
| 478 s->z_err = Z_DATA_ERROR; | |
| 479 } else { | |
| 480 (void)getLong(s); | |
| 481 /* The uncompressed length returned by above getlong() may be | |
| 482 * different from s->out in case of concatenated .gz files. | |
| 483 * Check for such files: | |
| 484 */ | |
| 485 check_header(s); | |
| 486 if (s->z_err == Z_OK) { | |
| 487 inflateReset(&(s->stream)); | |
| 488 s->crc = crc32(0L, Z_NULL, 0); | |
| 489 } | |
| 490 } | |
| 491 } | |
| 492 if (s->z_err != Z_OK || s->z_eof) break; | |
| 493 } | |
| 494 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); | |
| 495 | |
| 496 if (len == s->stream.avail_out && | |
| 497 (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)) | |
| 498 return -1; | |
| 499 return (int)(len - s->stream.avail_out); | |
| 500 } | |
| 501 | |
| 502 | |
| 503 /* =========================================================================== | |
| 504 Reads one byte from the compressed file. gzgetc returns this byte | |
| 505 or -1 in case of end of file or error. | |
| 506 */ | |
| 507 int ZEXPORT gzgetc(file) | |
| 508 gzFile file; | |
| 509 { | |
| 510 unsigned char c; | |
| 511 | |
| 512 return gzread(file, &c, 1) == 1 ? c : -1; | |
| 513 } | |
| 514 | |
| 515 | |
| 516 /* =========================================================================== | |
| 517 Push one byte back onto the stream. | |
| 518 */ | |
| 519 int ZEXPORT gzungetc(c, file) | |
| 520 int c; | |
| 521 gzFile file; | |
| 522 { | |
| 523 gz_stream *s = (gz_stream*)file; | |
| 524 | |
| 525 if (s == NULL || s->mode != 'r' || c == EOF || s->back != EOF) return EOF; | |
| 526 s->back = c; | |
| 527 s->out--; | |
| 528 s->last = (s->z_err == Z_STREAM_END); | |
| 529 if (s->last) s->z_err = Z_OK; | |
| 530 s->z_eof = 0; | |
| 531 return c; | |
| 532 } | |
| 533 | |
| 534 | |
| 535 /* =========================================================================== | |
| 536 Reads bytes from the compressed file until len-1 characters are | |
| 537 read, or a newline character is read and transferred to buf, or an | |
| 538 end-of-file condition is encountered. The string is then terminated | |
| 539 with a null character. | |
| 540 gzgets returns buf, or Z_NULL in case of error. | |
| 541 | |
| 542 The current implementation is not optimized at all. | |
| 543 */ | |
| 544 char * ZEXPORT gzgets(file, buf, len) | |
| 545 gzFile file; | |
| 546 char *buf; | |
| 547 int len; | |
| 548 { | |
| 549 char *b = buf; | |
| 550 if (buf == Z_NULL || len <= 0) return Z_NULL; | |
| 551 | |
| 552 while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ; | |
| 553 *buf = '\0'; | |
| 554 return b == buf && len > 0 ? Z_NULL : b; | |
| 555 } | |
| 556 | |
| 557 | |
| 558 #ifndef NO_GZCOMPRESS | |
| 559 /* =========================================================================== | |
| 560 Writes the given number of uncompressed bytes into the compressed file. | |
| 561 gzwrite returns the number of bytes actually written (0 in case of error). | |
| 562 */ | |
| 563 int ZEXPORT gzwrite (file, buf, len) | |
| 564 gzFile file; | |
| 565 voidpc buf; | |
| 566 unsigned len; | |
| 567 { | |
| 568 gz_stream *s = (gz_stream*)file; | |
| 569 | |
| 570 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
| 571 | |
| 572 s->stream.next_in = (Bytef*)buf; | |
| 573 s->stream.avail_in = len; | |
| 574 | |
| 575 while (s->stream.avail_in != 0) { | |
| 576 | |
| 577 if (s->stream.avail_out == 0) { | |
| 578 | |
| 579 s->stream.next_out = s->outbuf; | |
| 580 if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { | |
| 581 s->z_err = Z_ERRNO; | |
| 582 break; | |
| 583 } | |
| 584 s->stream.avail_out = Z_BUFSIZE; | |
| 585 } | |
| 586 s->in += s->stream.avail_in; | |
| 587 s->out += s->stream.avail_out; | |
| 588 s->z_err = deflate(&(s->stream), Z_NO_FLUSH); | |
| 589 s->in -= s->stream.avail_in; | |
| 590 s->out -= s->stream.avail_out; | |
| 591 if (s->z_err != Z_OK) break; | |
| 592 } | |
| 593 s->crc = crc32(s->crc, (const Bytef *)buf, len); | |
| 594 | |
| 595 return (int)(len - s->stream.avail_in); | |
| 596 } | |
| 597 | |
| 598 | |
| 599 /* =========================================================================== | |
| 600 Converts, formats, and writes the args to the compressed file under | |
| 601 control of the format string, as in fprintf. gzprintf returns the number of | |
| 602 uncompressed bytes actually written (0 in case of error). | |
| 603 */ | |
| 604 #ifdef STDC | |
| 605 #include <stdarg.h> | |
| 606 | |
| 607 int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...) | |
| 608 { | |
| 609 char buf[Z_PRINTF_BUFSIZE]; | |
| 610 va_list va; | |
| 611 int len; | |
| 612 | |
| 613 buf[sizeof(buf) - 1] = 0; | |
| 614 va_start(va, format); | |
| 615 #ifdef NO_vsnprintf | |
| 616 # ifdef HAS_vsprintf_void | |
| 617 (void)vsprintf(buf, format, va); | |
| 618 va_end(va); | |
| 619 for (len = 0; len < sizeof(buf); len++) | |
| 620 if (buf[len] == 0) break; | |
| 621 # else | |
| 622 len = vsprintf(buf, format, va); | |
| 623 va_end(va); | |
| 624 # endif | |
| 625 #else | |
| 626 # ifdef HAS_vsnprintf_void | |
| 627 (void)vsnprintf(buf, sizeof(buf), format, va); | |
| 628 va_end(va); | |
| 629 len = strlen(buf); | |
| 630 # else | |
| 631 len = vsnprintf(buf, sizeof(buf), format, va); | |
| 632 va_end(va); | |
| 633 # endif | |
| 634 #endif | |
| 635 if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0) | |
| 636 return 0; | |
| 637 return gzwrite(file, buf, (unsigned)len); | |
| 638 } | |
| 639 #else /* not ANSI C */ | |
| 640 | |
| 641 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
| 642 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) | |
| 643 gzFile file; | |
| 644 const char *format; | |
| 645 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
| 646 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; | |
| 647 { | |
| 648 char buf[Z_PRINTF_BUFSIZE]; | |
| 649 int len; | |
| 650 | |
| 651 buf[sizeof(buf) - 1] = 0; | |
| 652 #ifdef NO_snprintf | |
| 653 # ifdef HAS_sprintf_void | |
| 654 sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, | |
| 655 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
| 656 for (len = 0; len < sizeof(buf); len++) | |
| 657 if (buf[len] == 0) break; | |
| 658 # else | |
| 659 len = sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, | |
| 660 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
| 661 # endif | |
| 662 #else | |
| 663 # ifdef HAS_snprintf_void | |
| 664 snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
| 665 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
| 666 len = strlen(buf); | |
| 667 # else | |
| 668 len = snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
| 669 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
| 670 # endif | |
| 671 #endif | |
| 672 if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0) | |
| 673 return 0; | |
| 674 return gzwrite(file, buf, len); | |
| 675 } | |
| 676 #endif | |
| 677 | |
| 678 /* =========================================================================== | |
| 679 Writes c, converted to an unsigned char, into the compressed file. | |
| 680 gzputc returns the value that was written, or -1 in case of error. | |
| 681 */ | |
| 682 int ZEXPORT gzputc(file, c) | |
| 683 gzFile file; | |
| 684 int c; | |
| 685 { | |
| 686 unsigned char cc = (unsigned char) c; /* required for big endian systems */ | |
| 687 | |
| 688 return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1; | |
| 689 } | |
| 690 | |
| 691 | |
| 692 /* =========================================================================== | |
| 693 Writes the given null-terminated string to the compressed file, excluding | |
| 694 the terminating null character. | |
| 695 gzputs returns the number of characters written, or -1 in case of error. | |
| 696 */ | |
| 697 int ZEXPORT gzputs(file, s) | |
| 698 gzFile file; | |
| 699 const char *s; | |
| 700 { | |
| 701 return gzwrite(file, (char*)s, (unsigned)strlen(s)); | |
| 702 } | |
| 703 | |
| 704 | |
| 705 /* =========================================================================== | |
| 706 Flushes all pending output into the compressed file. The parameter | |
| 707 flush is as in the deflate() function. | |
| 708 */ | |
| 709 local int do_flush (file, flush) | |
| 710 gzFile file; | |
| 711 int flush; | |
| 712 { | |
| 713 uInt len; | |
| 714 int done = 0; | |
| 715 gz_stream *s = (gz_stream*)file; | |
| 716 | |
| 717 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
| 718 | |
| 719 s->stream.avail_in = 0; /* should be zero already anyway */ | |
| 720 | |
| 721 for (;;) { | |
| 722 len = Z_BUFSIZE - s->stream.avail_out; | |
| 723 | |
| 724 if (len != 0) { | |
| 725 if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) { | |
| 726 s->z_err = Z_ERRNO; | |
| 727 return Z_ERRNO; | |
| 728 } | |
| 729 s->stream.next_out = s->outbuf; | |
| 730 s->stream.avail_out = Z_BUFSIZE; | |
| 731 } | |
| 732 if (done) break; | |
| 733 s->out += s->stream.avail_out; | |
| 734 s->z_err = deflate(&(s->stream), flush); | |
| 735 s->out -= s->stream.avail_out; | |
| 736 | |
| 737 /* Ignore the second of two consecutive flushes: */ | |
| 738 if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK; | |
| 739 | |
| 740 /* deflate has finished flushing only when it hasn't used up | |
| 741 * all the available space in the output buffer: | |
| 742 */ | |
| 743 done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); | |
| 744 | |
| 745 if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break; | |
| 746 } | |
| 747 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; | |
| 748 } | |
| 749 | |
| 750 int ZEXPORT gzflush (file, flush) | |
| 751 gzFile file; | |
| 752 int flush; | |
| 753 { | |
| 754 gz_stream *s = (gz_stream*)file; | |
| 755 int err = do_flush (file, flush); | |
| 756 | |
| 757 if (err) return err; | |
| 758 fflush(s->file); | |
| 759 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; | |
| 760 } | |
| 761 #endif /* NO_GZCOMPRESS */ | |
| 762 | |
| 763 /* =========================================================================== | |
| 764 Sets the starting position for the next gzread or gzwrite on the given | |
| 765 compressed file. The offset represents a number of bytes in the | |
| 766 gzseek returns the resulting offset location as measured in bytes from | |
| 767 the beginning of the uncompressed stream, or -1 in case of error. | |
| 768 SEEK_END is not implemented, returns error. | |
| 769 In this version of the library, gzseek can be extremely slow. | |
| 770 */ | |
| 771 z_off_t ZEXPORT gzseek (file, offset, whence) | |
| 772 gzFile file; | |
| 773 z_off_t offset; | |
| 774 int whence; | |
| 775 { | |
| 776 gz_stream *s = (gz_stream*)file; | |
| 777 | |
| 778 if (s == NULL || whence == SEEK_END || | |
| 779 s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) { | |
| 780 return -1L; | |
| 781 } | |
| 782 | |
| 783 if (s->mode == 'w') { | |
| 784 #ifdef NO_GZCOMPRESS | |
| 785 return -1L; | |
| 786 #else | |
| 787 if (whence == SEEK_SET) { | |
| 788 offset -= s->in; | |
| 789 } | |
| 790 if (offset < 0) return -1L; | |
| 791 | |
| 792 /* At this point, offset is the number of zero bytes to write. */ | |
| 793 if (s->inbuf == Z_NULL) { | |
| 794 s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */ | |
| 795 if (s->inbuf == Z_NULL) return -1L; | |
| 796 zmemzero(s->inbuf, Z_BUFSIZE); | |
| 797 } | |
| 798 while (offset > 0) { | |
| 799 uInt size = Z_BUFSIZE; | |
| 800 if (offset < Z_BUFSIZE) size = (uInt)offset; | |
| 801 | |
| 802 size = gzwrite(file, s->inbuf, size); | |
| 803 if (size == 0) return -1L; | |
| 804 | |
| 805 offset -= size; | |
| 806 } | |
| 807 return s->in; | |
| 808 #endif | |
| 809 } | |
| 810 /* Rest of function is for reading only */ | |
| 811 | |
| 812 /* compute absolute position */ | |
| 813 if (whence == SEEK_CUR) { | |
| 814 offset += s->out; | |
| 815 } | |
| 816 if (offset < 0) return -1L; | |
| 817 | |
| 818 if (s->transparent) { | |
| 819 /* map to fseek */ | |
| 820 s->back = EOF; | |
| 821 s->stream.avail_in = 0; | |
| 822 s->stream.next_in = s->inbuf; | |
| 823 if (fseek(s->file, offset, SEEK_SET) < 0) return -1L; | |
| 824 | |
| 825 s->in = s->out = offset; | |
| 826 return offset; | |
| 827 } | |
| 828 | |
| 829 /* For a negative seek, rewind and use positive seek */ | |
| 830 if (offset >= s->out) { | |
| 831 offset -= s->out; | |
| 832 } else if (gzrewind(file) < 0) { | |
| 833 return -1L; | |
| 834 } | |
| 835 /* offset is now the number of bytes to skip. */ | |
| 836 | |
| 837 if (offset != 0 && s->outbuf == Z_NULL) { | |
| 838 s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
| 839 if (s->outbuf == Z_NULL) return -1L; | |
| 840 } | |
| 841 if (offset && s->back != EOF) { | |
| 842 s->back = EOF; | |
| 843 s->out++; | |
| 844 offset--; | |
| 845 if (s->last) s->z_err = Z_STREAM_END; | |
| 846 } | |
| 847 while (offset > 0) { | |
| 848 int size = Z_BUFSIZE; | |
| 849 if (offset < Z_BUFSIZE) size = (int)offset; | |
| 850 | |
| 851 size = gzread(file, s->outbuf, (uInt)size); | |
| 852 if (size <= 0) return -1L; | |
| 853 offset -= size; | |
| 854 } | |
| 855 return s->out; | |
| 856 } | |
| 857 | |
| 858 /* =========================================================================== | |
| 859 Rewinds input file. | |
| 860 */ | |
| 861 int ZEXPORT gzrewind (file) | |
| 862 gzFile file; | |
| 863 { | |
| 864 gz_stream *s = (gz_stream*)file; | |
| 865 | |
| 866 if (s == NULL || s->mode != 'r') return -1; | |
| 867 | |
| 868 s->z_err = Z_OK; | |
| 869 s->z_eof = 0; | |
| 870 s->back = EOF; | |
| 871 s->stream.avail_in = 0; | |
| 872 s->stream.next_in = s->inbuf; | |
| 873 s->crc = crc32(0L, Z_NULL, 0); | |
| 874 if (!s->transparent) (void)inflateReset(&s->stream); | |
| 875 s->in = 0; | |
| 876 s->out = 0; | |
| 877 return fseek(s->file, s->start, SEEK_SET); | |
| 878 } | |
| 879 | |
| 880 /* =========================================================================== | |
| 881 Returns the starting position for the next gzread or gzwrite on the | |
| 882 given compressed file. This position represents a number of bytes in the | |
| 883 uncompressed data stream. | |
| 884 */ | |
| 885 z_off_t ZEXPORT gztell (file) | |
| 886 gzFile file; | |
| 887 { | |
| 888 return gzseek(file, 0L, SEEK_CUR); | |
| 889 } | |
| 890 | |
| 891 /* =========================================================================== | |
| 892 Returns 1 when EOF has previously been detected reading the given | |
| 893 input stream, otherwise zero. | |
| 894 */ | |
| 895 int ZEXPORT gzeof (file) | |
| 896 gzFile file; | |
| 897 { | |
| 898 gz_stream *s = (gz_stream*)file; | |
| 899 | |
| 900 /* With concatenated compressed files that can have embedded | |
| 901 * crc trailers, z_eof is no longer the only/best indicator of EOF | |
| 902 * on a gz_stream. Handle end-of-stream error explicitly here. | |
| 903 */ | |
| 904 if (s == NULL || s->mode != 'r') return 0; | |
| 905 if (s->z_eof) return 1; | |
| 906 return s->z_err == Z_STREAM_END; | |
| 907 } | |
| 908 | |
| 909 /* =========================================================================== | |
| 910 Returns 1 if reading and doing so transparently, otherwise zero. | |
| 911 */ | |
| 912 int ZEXPORT gzdirect (file) | |
| 913 gzFile file; | |
| 914 { | |
| 915 gz_stream *s = (gz_stream*)file; | |
| 916 | |
| 917 if (s == NULL || s->mode != 'r') return 0; | |
| 918 return s->transparent; | |
| 919 } | |
| 920 | |
| 921 #ifndef NO_GZCOMPRESS // Google Gears addition, to avoid compile warning | |
| 922 /* =========================================================================== | |
| 923 Outputs a long in LSB order to the given file | |
| 924 */ | |
| 925 local void putLong (file, x) | |
| 926 FILE *file; | |
| 927 uLong x; | |
| 928 { | |
| 929 int n; | |
| 930 for (n = 0; n < 4; n++) { | |
| 931 fputc((int)(x & 0xff), file); | |
| 932 x >>= 8; | |
| 933 } | |
| 934 } | |
| 935 #endif | |
| 936 | |
| 937 /* =========================================================================== | |
| 938 Reads a long in LSB order from the given gz_stream. Sets z_err in case | |
| 939 of error. | |
| 940 */ | |
| 941 local uLong getLong (s) | |
| 942 gz_stream *s; | |
| 943 { | |
| 944 uLong x = (uLong)get_byte(s); | |
| 945 int c; | |
| 946 | |
| 947 x += ((uLong)get_byte(s))<<8; | |
| 948 x += ((uLong)get_byte(s))<<16; | |
| 949 c = get_byte(s); | |
| 950 if (c == EOF) s->z_err = Z_DATA_ERROR; | |
| 951 x += ((uLong)c)<<24; | |
| 952 return x; | |
| 953 } | |
| 954 | |
| 955 /* =========================================================================== | |
| 956 Flushes all pending output if necessary, closes the compressed file | |
| 957 and deallocates all the (de)compression state. | |
| 958 */ | |
| 959 int ZEXPORT gzclose (file) | |
| 960 gzFile file; | |
| 961 { | |
| 962 gz_stream *s = (gz_stream*)file; | |
| 963 | |
| 964 if (s == NULL) return Z_STREAM_ERROR; | |
| 965 | |
| 966 if (s->mode == 'w') { | |
| 967 #ifdef NO_GZCOMPRESS | |
| 968 return Z_STREAM_ERROR; | |
| 969 #else | |
| 970 if (do_flush (file, Z_FINISH) != Z_OK) | |
| 971 return destroy((gz_stream*)file); | |
| 972 | |
| 973 putLong (s->file, s->crc); | |
| 974 putLong (s->file, (uLong)(s->in & 0xffffffff)); | |
| 975 #endif | |
| 976 } | |
| 977 return destroy((gz_stream*)file); | |
| 978 } | |
| 979 | |
| 980 // Google Gears modification: strerror is not present on WinCE. | |
| 981 #if defined(STDC) && !defined(_WIN32_WCE) | |
| 982 # define zstrerror(errnum) strerror(errnum) | |
| 983 #else | |
| 984 # define zstrerror(errnum) "" | |
| 985 #endif | |
| 986 | |
| 987 /* =========================================================================== | |
| 988 Returns the error message for the last error which occurred on the | |
| 989 given compressed file. errnum is set to zlib error number. If an | |
| 990 error occurred in the file system and not in the compression library, | |
| 991 errnum is set to Z_ERRNO and the application may consult errno | |
| 992 to get the exact error code. | |
| 993 */ | |
| 994 const char * ZEXPORT gzerror (file, errnum) | |
| 995 gzFile file; | |
| 996 int *errnum; | |
| 997 { | |
| 998 char *m; | |
| 999 gz_stream *s = (gz_stream*)file; | |
| 1000 | |
| 1001 if (s == NULL) { | |
| 1002 *errnum = Z_STREAM_ERROR; | |
| 1003 return (const char*)ERR_MSG(Z_STREAM_ERROR); | |
| 1004 } | |
| 1005 *errnum = s->z_err; | |
| 1006 if (*errnum == Z_OK) return (const char*)""; | |
| 1007 | |
| 1008 m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg); | |
| 1009 | |
| 1010 if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err); | |
| 1011 | |
| 1012 TRYFREE(s->msg); | |
| 1013 s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3); | |
| 1014 if (s->msg == Z_NULL) return (const char*)ERR_MSG(Z_MEM_ERROR); | |
| 1015 strcpy(s->msg, s->path); | |
| 1016 strcat(s->msg, ": "); | |
| 1017 strcat(s->msg, m); | |
| 1018 return (const char*)s->msg; | |
| 1019 } | |
| 1020 | |
| 1021 /* =========================================================================== | |
| 1022 Clear the error and end-of-file flags, and do the same for the real file. | |
| 1023 */ | |
| 1024 void ZEXPORT gzclearerr (file) | |
| 1025 gzFile file; | |
| 1026 { | |
| 1027 gz_stream *s = (gz_stream*)file; | |
| 1028 | |
| 1029 if (s == NULL) return; | |
| 1030 if (s->z_err != Z_STREAM_END) s->z_err = Z_OK; | |
| 1031 s->z_eof = 0; | |
| 1032 clearerr(s->file); | |
| 1033 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 13564004:
Complete update of zlib from 1.2.3 to 1.2.5. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src