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| 1 /* gzread.c -- zlib functions for reading gzip files |
| 2 * Copyright (C) 2004, 2005, 2010 Mark Adler |
| 3 * For conditions of distribution and use, see copyright notice in zlib.h |
| 4 */ |
| 5 |
| 6 #include "gzguts.h" |
| 7 |
| 8 /* Local functions */ |
| 9 local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *)); |
| 10 local int gz_avail OF((gz_statep)); |
| 11 local int gz_next4 OF((gz_statep, unsigned long *)); |
| 12 local int gz_head OF((gz_statep)); |
| 13 local int gz_decomp OF((gz_statep)); |
| 14 local int gz_make OF((gz_statep)); |
| 15 local int gz_skip OF((gz_statep, z_off64_t)); |
| 16 |
| 17 /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from |
| 18 state->fd, and update state->eof, state->err, and state->msg as appropriate. |
| 19 This function needs to loop on read(), since read() is not guaranteed to |
| 20 read the number of bytes requested, depending on the type of descriptor. */ |
| 21 local int gz_load(state, buf, len, have) |
| 22 gz_statep state; |
| 23 unsigned char *buf; |
| 24 unsigned len; |
| 25 unsigned *have; |
| 26 { |
| 27 int ret; |
| 28 |
| 29 *have = 0; |
| 30 do { |
| 31 ret = read(state->fd, buf + *have, len - *have); |
| 32 if (ret <= 0) |
| 33 break; |
| 34 *have += ret; |
| 35 } while (*have < len); |
| 36 if (ret < 0) { |
| 37 gz_error(state, Z_ERRNO, zstrerror()); |
| 38 return -1; |
| 39 } |
| 40 if (ret == 0) |
| 41 state->eof = 1; |
| 42 return 0; |
| 43 } |
| 44 |
| 45 /* Load up input buffer and set eof flag if last data loaded -- return -1 on |
| 46 error, 0 otherwise. Note that the eof flag is set when the end of the input |
| 47 file is reached, even though there may be unused data in the buffer. Once |
| 48 that data has been used, no more attempts will be made to read the file. |
| 49 gz_avail() assumes that strm->avail_in == 0. */ |
| 50 local int gz_avail(state) |
| 51 gz_statep state; |
| 52 { |
| 53 z_streamp strm = &(state->strm); |
| 54 |
| 55 if (state->err != Z_OK) |
| 56 return -1; |
| 57 if (state->eof == 0) { |
| 58 if (gz_load(state, state->in, state->size, |
| 59 (unsigned *)&(strm->avail_in)) == -1) |
| 60 return -1; |
| 61 strm->next_in = state->in; |
| 62 } |
| 63 return 0; |
| 64 } |
| 65 |
| 66 /* Get next byte from input, or -1 if end or error. */ |
| 67 #define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \ |
| 68 (strm->avail_in == 0 ? -1 : \ |
| 69 (strm->avail_in--, *(strm->next_in)++))) |
| 70 |
| 71 /* Get a four-byte little-endian integer and return 0 on success and the value |
| 72 in *ret. Otherwise -1 is returned and *ret is not modified. */ |
| 73 local int gz_next4(state, ret) |
| 74 gz_statep state; |
| 75 unsigned long *ret; |
| 76 { |
| 77 int ch; |
| 78 unsigned long val; |
| 79 z_streamp strm = &(state->strm); |
| 80 |
| 81 val = NEXT(); |
| 82 val += (unsigned)NEXT() << 8; |
| 83 val += (unsigned long)NEXT() << 16; |
| 84 ch = NEXT(); |
| 85 if (ch == -1) |
| 86 return -1; |
| 87 val += (unsigned long)ch << 24; |
| 88 *ret = val; |
| 89 return 0; |
| 90 } |
| 91 |
| 92 /* Look for gzip header, set up for inflate or copy. state->have must be zero. |
| 93 If this is the first time in, allocate required memory. state->how will be |
| 94 left unchanged if there is no more input data available, will be set to COPY |
| 95 if there is no gzip header and direct copying will be performed, or it will |
| 96 be set to GZIP for decompression, and the gzip header will be skipped so |
| 97 that the next available input data is the raw deflate stream. If direct |
| 98 copying, then leftover input data from the input buffer will be copied to |
| 99 the output buffer. In that case, all further file reads will be directly to |
| 100 either the output buffer or a user buffer. If decompressing, the inflate |
| 101 state and the check value will be initialized. gz_head() will return 0 on |
| 102 success or -1 on failure. Failures may include read errors or gzip header |
| 103 errors. */ |
| 104 local int gz_head(state) |
| 105 gz_statep state; |
| 106 { |
| 107 z_streamp strm = &(state->strm); |
| 108 int flags; |
| 109 unsigned len; |
| 110 |
| 111 /* allocate read buffers and inflate memory */ |
| 112 if (state->size == 0) { |
| 113 /* allocate buffers */ |
| 114 state->in = malloc(state->want); |
| 115 state->out = malloc(state->want << 1); |
| 116 if (state->in == NULL || state->out == NULL) { |
| 117 if (state->out != NULL) |
| 118 free(state->out); |
| 119 if (state->in != NULL) |
| 120 free(state->in); |
| 121 gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 122 return -1; |
| 123 } |
| 124 state->size = state->want; |
| 125 |
| 126 /* allocate inflate memory */ |
| 127 state->strm.zalloc = Z_NULL; |
| 128 state->strm.zfree = Z_NULL; |
| 129 state->strm.opaque = Z_NULL; |
| 130 state->strm.avail_in = 0; |
| 131 state->strm.next_in = Z_NULL; |
| 132 if (inflateInit2(&(state->strm), -15) != Z_OK) { /* raw inflate */ |
| 133 free(state->out); |
| 134 free(state->in); |
| 135 state->size = 0; |
| 136 gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 137 return -1; |
| 138 } |
| 139 } |
| 140 |
| 141 /* get some data in the input buffer */ |
| 142 if (strm->avail_in == 0) { |
| 143 if (gz_avail(state) == -1) |
| 144 return -1; |
| 145 if (strm->avail_in == 0) |
| 146 return 0; |
| 147 } |
| 148 |
| 149 /* look for the gzip magic header bytes 31 and 139 */ |
| 150 if (strm->next_in[0] == 31) { |
| 151 strm->avail_in--; |
| 152 strm->next_in++; |
| 153 if (strm->avail_in == 0 && gz_avail(state) == -1) |
| 154 return -1; |
| 155 if (strm->avail_in && strm->next_in[0] == 139) { |
| 156 /* we have a gzip header, woo hoo! */ |
| 157 strm->avail_in--; |
| 158 strm->next_in++; |
| 159 |
| 160 /* skip rest of header */ |
| 161 if (NEXT() != 8) { /* compression method */ |
| 162 gz_error(state, Z_DATA_ERROR, "unknown compression method"); |
| 163 return -1; |
| 164 } |
| 165 flags = NEXT(); |
| 166 if (flags & 0xe0) { /* reserved flag bits */ |
| 167 gz_error(state, Z_DATA_ERROR, "unknown header flags set"); |
| 168 return -1; |
| 169 } |
| 170 NEXT(); /* modification time */ |
| 171 NEXT(); |
| 172 NEXT(); |
| 173 NEXT(); |
| 174 NEXT(); /* extra flags */ |
| 175 NEXT(); /* operating system */ |
| 176 if (flags & 4) { /* extra field */ |
| 177 len = (unsigned)NEXT(); |
| 178 len += (unsigned)NEXT() << 8; |
| 179 while (len--) |
| 180 if (NEXT() < 0) |
| 181 break; |
| 182 } |
| 183 if (flags & 8) /* file name */ |
| 184 while (NEXT() > 0) |
| 185 ; |
| 186 if (flags & 16) /* comment */ |
| 187 while (NEXT() > 0) |
| 188 ; |
| 189 if (flags & 2) { /* header crc */ |
| 190 NEXT(); |
| 191 NEXT(); |
| 192 } |
| 193 /* an unexpected end of file is not checked for here -- it will be |
| 194 noticed on the first request for uncompressed data */ |
| 195 |
| 196 /* set up for decompression */ |
| 197 inflateReset(strm); |
| 198 strm->adler = crc32(0L, Z_NULL, 0); |
| 199 state->how = GZIP; |
| 200 state->direct = 0; |
| 201 return 0; |
| 202 } |
| 203 else { |
| 204 /* not a gzip file -- save first byte (31) and fall to raw i/o */ |
| 205 state->out[0] = 31; |
| 206 state->have = 1; |
| 207 } |
| 208 } |
| 209 |
| 210 /* doing raw i/o, save start of raw data for seeking, copy any leftover |
| 211 input to output -- this assumes that the output buffer is larger than |
| 212 the input buffer, which also assures space for gzungetc() */ |
| 213 state->raw = state->pos; |
| 214 state->next = state->out; |
| 215 if (strm->avail_in) { |
| 216 memcpy(state->next + state->have, strm->next_in, strm->avail_in); |
| 217 state->have += strm->avail_in; |
| 218 strm->avail_in = 0; |
| 219 } |
| 220 state->how = COPY; |
| 221 state->direct = 1; |
| 222 return 0; |
| 223 } |
| 224 |
| 225 /* Decompress from input to the provided next_out and avail_out in the state. |
| 226 If the end of the compressed data is reached, then verify the gzip trailer |
| 227 check value and length (modulo 2^32). state->have and state->next are set |
| 228 to point to the just decompressed data, and the crc is updated. If the |
| 229 trailer is verified, state->how is reset to LOOK to look for the next gzip |
| 230 stream or raw data, once state->have is depleted. Returns 0 on success, -1 |
| 231 on failure. Failures may include invalid compressed data or a failed gzip |
| 232 trailer verification. */ |
| 233 local int gz_decomp(state) |
| 234 gz_statep state; |
| 235 { |
| 236 int ret; |
| 237 unsigned had; |
| 238 unsigned long crc, len; |
| 239 z_streamp strm = &(state->strm); |
| 240 |
| 241 /* fill output buffer up to end of deflate stream */ |
| 242 had = strm->avail_out; |
| 243 do { |
| 244 /* get more input for inflate() */ |
| 245 if (strm->avail_in == 0 && gz_avail(state) == -1) |
| 246 return -1; |
| 247 if (strm->avail_in == 0) { |
| 248 gz_error(state, Z_DATA_ERROR, "unexpected end of file"); |
| 249 return -1; |
| 250 } |
| 251 |
| 252 /* decompress and handle errors */ |
| 253 ret = inflate(strm, Z_NO_FLUSH); |
| 254 if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { |
| 255 gz_error(state, Z_STREAM_ERROR, |
| 256 "internal error: inflate stream corrupt"); |
| 257 return -1; |
| 258 } |
| 259 if (ret == Z_MEM_ERROR) { |
| 260 gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 261 return -1; |
| 262 } |
| 263 if (ret == Z_DATA_ERROR) { /* deflate stream invalid */ |
| 264 gz_error(state, Z_DATA_ERROR, |
| 265 strm->msg == NULL ? "compressed data error" : strm->msg); |
| 266 return -1; |
| 267 } |
| 268 } while (strm->avail_out && ret != Z_STREAM_END); |
| 269 |
| 270 /* update available output and crc check value */ |
| 271 state->have = had - strm->avail_out; |
| 272 state->next = strm->next_out - state->have; |
| 273 strm->adler = crc32(strm->adler, state->next, state->have); |
| 274 |
| 275 /* check gzip trailer if at end of deflate stream */ |
| 276 if (ret == Z_STREAM_END) { |
| 277 if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) { |
| 278 gz_error(state, Z_DATA_ERROR, "unexpected end of file"); |
| 279 return -1; |
| 280 } |
| 281 if (crc != strm->adler) { |
| 282 gz_error(state, Z_DATA_ERROR, "incorrect data check"); |
| 283 return -1; |
| 284 } |
| 285 if (len != (strm->total_out & 0xffffffffL)) { |
| 286 gz_error(state, Z_DATA_ERROR, "incorrect length check"); |
| 287 return -1; |
| 288 } |
| 289 state->how = LOOK; /* ready for next stream, once have is 0 (leave |
| 290 state->direct unchanged to remember how) */ |
| 291 } |
| 292 |
| 293 /* good decompression */ |
| 294 return 0; |
| 295 } |
| 296 |
| 297 /* Make data and put in the output buffer. Assumes that state->have == 0. |
| 298 Data is either copied from the input file or decompressed from the input |
| 299 file depending on state->how. If state->how is LOOK, then a gzip header is |
| 300 looked for (and skipped if found) to determine wither to copy or decompress. |
| 301 Returns -1 on error, otherwise 0. gz_make() will leave state->have as COPY |
| 302 or GZIP unless the end of the input file has been reached and all data has |
| 303 been processed. */ |
| 304 local int gz_make(state) |
| 305 gz_statep state; |
| 306 { |
| 307 z_streamp strm = &(state->strm); |
| 308 |
| 309 if (state->how == LOOK) { /* look for gzip header */ |
| 310 if (gz_head(state) == -1) |
| 311 return -1; |
| 312 if (state->have) /* got some data from gz_head() */ |
| 313 return 0; |
| 314 } |
| 315 if (state->how == COPY) { /* straight copy */ |
| 316 if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1) |
| 317 return -1; |
| 318 state->next = state->out; |
| 319 } |
| 320 else if (state->how == GZIP) { /* decompress */ |
| 321 strm->avail_out = state->size << 1; |
| 322 strm->next_out = state->out; |
| 323 if (gz_decomp(state) == -1) |
| 324 return -1; |
| 325 } |
| 326 return 0; |
| 327 } |
| 328 |
| 329 /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */ |
| 330 local int gz_skip(state, len) |
| 331 gz_statep state; |
| 332 z_off64_t len; |
| 333 { |
| 334 unsigned n; |
| 335 |
| 336 /* skip over len bytes or reach end-of-file, whichever comes first */ |
| 337 while (len) |
| 338 /* skip over whatever is in output buffer */ |
| 339 if (state->have) { |
| 340 n = GT_OFF(state->have) || (z_off64_t)state->have > len ? |
| 341 (unsigned)len : state->have; |
| 342 state->have -= n; |
| 343 state->next += n; |
| 344 state->pos += n; |
| 345 len -= n; |
| 346 } |
| 347 |
| 348 /* output buffer empty -- return if we're at the end of the input */ |
| 349 else if (state->eof && state->strm.avail_in == 0) |
| 350 break; |
| 351 |
| 352 /* need more data to skip -- load up output buffer */ |
| 353 else { |
| 354 /* get more output, looking for header if required */ |
| 355 if (gz_make(state) == -1) |
| 356 return -1; |
| 357 } |
| 358 return 0; |
| 359 } |
| 360 |
| 361 /* -- see zlib.h -- */ |
| 362 int ZEXPORT gzread(file, buf, len) |
| 363 gzFile file; |
| 364 voidp buf; |
| 365 unsigned len; |
| 366 { |
| 367 unsigned got, n; |
| 368 gz_statep state; |
| 369 z_streamp strm; |
| 370 |
| 371 /* get internal structure */ |
| 372 if (file == NULL) |
| 373 return -1; |
| 374 state = (gz_statep)file; |
| 375 strm = &(state->strm); |
| 376 |
| 377 /* check that we're reading and that there's no error */ |
| 378 if (state->mode != GZ_READ || state->err != Z_OK) |
| 379 return -1; |
| 380 |
| 381 /* since an int is returned, make sure len fits in one, otherwise return |
| 382 with an error (this avoids the flaw in the interface) */ |
| 383 if ((int)len < 0) { |
| 384 gz_error(state, Z_BUF_ERROR, "requested length does not fit in int"); |
| 385 return -1; |
| 386 } |
| 387 |
| 388 /* if len is zero, avoid unnecessary operations */ |
| 389 if (len == 0) |
| 390 return 0; |
| 391 |
| 392 /* process a skip request */ |
| 393 if (state->seek) { |
| 394 state->seek = 0; |
| 395 if (gz_skip(state, state->skip) == -1) |
| 396 return -1; |
| 397 } |
| 398 |
| 399 /* get len bytes to buf, or less than len if at the end */ |
| 400 got = 0; |
| 401 do { |
| 402 /* first just try copying data from the output buffer */ |
| 403 if (state->have) { |
| 404 n = state->have > len ? len : state->have; |
| 405 memcpy(buf, state->next, n); |
| 406 state->next += n; |
| 407 state->have -= n; |
| 408 } |
| 409 |
| 410 /* output buffer empty -- return if we're at the end of the input */ |
| 411 else if (state->eof && strm->avail_in == 0) |
| 412 break; |
| 413 |
| 414 /* need output data -- for small len or new stream load up our output |
| 415 buffer */ |
| 416 else if (state->how == LOOK || len < (state->size << 1)) { |
| 417 /* get more output, looking for header if required */ |
| 418 if (gz_make(state) == -1) |
| 419 return -1; |
| 420 continue; /* no progress yet -- go back to memcpy() above */ |
| 421 /* the copy above assures that we will leave with space in the |
| 422 output buffer, allowing at least one gzungetc() to succeed */ |
| 423 } |
| 424 |
| 425 /* large len -- read directly into user buffer */ |
| 426 else if (state->how == COPY) { /* read directly */ |
| 427 if (gz_load(state, buf, len, &n) == -1) |
| 428 return -1; |
| 429 } |
| 430 |
| 431 /* large len -- decompress directly into user buffer */ |
| 432 else { /* state->how == GZIP */ |
| 433 strm->avail_out = len; |
| 434 strm->next_out = buf; |
| 435 if (gz_decomp(state) == -1) |
| 436 return -1; |
| 437 n = state->have; |
| 438 state->have = 0; |
| 439 } |
| 440 |
| 441 /* update progress */ |
| 442 len -= n; |
| 443 buf = (char *)buf + n; |
| 444 got += n; |
| 445 state->pos += n; |
| 446 } while (len); |
| 447 |
| 448 /* return number of bytes read into user buffer (will fit in int) */ |
| 449 return (int)got; |
| 450 } |
| 451 |
| 452 /* -- see zlib.h -- */ |
| 453 int ZEXPORT gzgetc(file) |
| 454 gzFile file; |
| 455 { |
| 456 int ret; |
| 457 unsigned char buf[1]; |
| 458 gz_statep state; |
| 459 |
| 460 /* get internal structure */ |
| 461 if (file == NULL) |
| 462 return -1; |
| 463 state = (gz_statep)file; |
| 464 |
| 465 /* check that we're reading and that there's no error */ |
| 466 if (state->mode != GZ_READ || state->err != Z_OK) |
| 467 return -1; |
| 468 |
| 469 /* try output buffer (no need to check for skip request) */ |
| 470 if (state->have) { |
| 471 state->have--; |
| 472 state->pos++; |
| 473 return *(state->next)++; |
| 474 } |
| 475 |
| 476 /* nothing there -- try gzread() */ |
| 477 ret = gzread(file, buf, 1); |
| 478 return ret < 1 ? -1 : buf[0]; |
| 479 } |
| 480 |
| 481 /* -- see zlib.h -- */ |
| 482 int ZEXPORT gzungetc(c, file) |
| 483 int c; |
| 484 gzFile file; |
| 485 { |
| 486 gz_statep state; |
| 487 |
| 488 /* get internal structure */ |
| 489 if (file == NULL) |
| 490 return -1; |
| 491 state = (gz_statep)file; |
| 492 |
| 493 /* check that we're reading and that there's no error */ |
| 494 if (state->mode != GZ_READ || state->err != Z_OK) |
| 495 return -1; |
| 496 |
| 497 /* process a skip request */ |
| 498 if (state->seek) { |
| 499 state->seek = 0; |
| 500 if (gz_skip(state, state->skip) == -1) |
| 501 return -1; |
| 502 } |
| 503 |
| 504 /* can't push EOF */ |
| 505 if (c < 0) |
| 506 return -1; |
| 507 |
| 508 /* if output buffer empty, put byte at end (allows more pushing) */ |
| 509 if (state->have == 0) { |
| 510 state->have = 1; |
| 511 state->next = state->out + (state->size << 1) - 1; |
| 512 state->next[0] = c; |
| 513 state->pos--; |
| 514 return c; |
| 515 } |
| 516 |
| 517 /* if no room, give up (must have already done a gzungetc()) */ |
| 518 if (state->have == (state->size << 1)) { |
| 519 gz_error(state, Z_BUF_ERROR, "out of room to push characters"); |
| 520 return -1; |
| 521 } |
| 522 |
| 523 /* slide output data if needed and insert byte before existing data */ |
| 524 if (state->next == state->out) { |
| 525 unsigned char *src = state->out + state->have; |
| 526 unsigned char *dest = state->out + (state->size << 1); |
| 527 while (src > state->out) |
| 528 *--dest = *--src; |
| 529 state->next = dest; |
| 530 } |
| 531 state->have++; |
| 532 state->next--; |
| 533 state->next[0] = c; |
| 534 state->pos--; |
| 535 return c; |
| 536 } |
| 537 |
| 538 /* -- see zlib.h -- */ |
| 539 char * ZEXPORT gzgets(file, buf, len) |
| 540 gzFile file; |
| 541 char *buf; |
| 542 int len; |
| 543 { |
| 544 unsigned left, n; |
| 545 char *str; |
| 546 unsigned char *eol; |
| 547 gz_statep state; |
| 548 |
| 549 /* check parameters and get internal structure */ |
| 550 if (file == NULL || buf == NULL || len < 1) |
| 551 return NULL; |
| 552 state = (gz_statep)file; |
| 553 |
| 554 /* check that we're reading and that there's no error */ |
| 555 if (state->mode != GZ_READ || state->err != Z_OK) |
| 556 return NULL; |
| 557 |
| 558 /* process a skip request */ |
| 559 if (state->seek) { |
| 560 state->seek = 0; |
| 561 if (gz_skip(state, state->skip) == -1) |
| 562 return NULL; |
| 563 } |
| 564 |
| 565 /* copy output bytes up to new line or len - 1, whichever comes first -- |
| 566 append a terminating zero to the string (we don't check for a zero in |
| 567 the contents, let the user worry about that) */ |
| 568 str = buf; |
| 569 left = (unsigned)len - 1; |
| 570 if (left) do { |
| 571 /* assure that something is in the output buffer */ |
| 572 if (state->have == 0) { |
| 573 if (gz_make(state) == -1) |
| 574 return NULL; /* error */ |
| 575 if (state->have == 0) { /* end of file */ |
| 576 if (buf == str) /* got bupkus */ |
| 577 return NULL; |
| 578 break; /* got something -- return it */ |
| 579 } |
| 580 } |
| 581 |
| 582 /* look for end-of-line in current output buffer */ |
| 583 n = state->have > left ? left : state->have; |
| 584 eol = memchr(state->next, '\n', n); |
| 585 if (eol != NULL) |
| 586 n = (unsigned)(eol - state->next) + 1; |
| 587 |
| 588 /* copy through end-of-line, or remainder if not found */ |
| 589 memcpy(buf, state->next, n); |
| 590 state->have -= n; |
| 591 state->next += n; |
| 592 state->pos += n; |
| 593 left -= n; |
| 594 buf += n; |
| 595 } while (left && eol == NULL); |
| 596 |
| 597 /* found end-of-line or out of space -- terminate string and return it */ |
| 598 buf[0] = 0; |
| 599 return str; |
| 600 } |
| 601 |
| 602 /* -- see zlib.h -- */ |
| 603 int ZEXPORT gzdirect(file) |
| 604 gzFile file; |
| 605 { |
| 606 gz_statep state; |
| 607 |
| 608 /* get internal structure */ |
| 609 if (file == NULL) |
| 610 return 0; |
| 611 state = (gz_statep)file; |
| 612 |
| 613 /* check that we're reading */ |
| 614 if (state->mode != GZ_READ) |
| 615 return 0; |
| 616 |
| 617 /* if the state is not known, but we can find out, then do so (this is |
| 618 mainly for right after a gzopen() or gzdopen()) */ |
| 619 if (state->how == LOOK && state->have == 0) |
| 620 (void)gz_head(state); |
| 621 |
| 622 /* return 1 if reading direct, 0 if decompressing a gzip stream */ |
| 623 return state->direct; |
| 624 } |
| 625 |
| 626 /* -- see zlib.h -- */ |
| 627 int ZEXPORT gzclose_r(file) |
| 628 gzFile file; |
| 629 { |
| 630 int ret; |
| 631 gz_statep state; |
| 632 |
| 633 /* get internal structure */ |
| 634 if (file == NULL) |
| 635 return Z_STREAM_ERROR; |
| 636 state = (gz_statep)file; |
| 637 |
| 638 /* check that we're reading */ |
| 639 if (state->mode != GZ_READ) |
| 640 return Z_STREAM_ERROR; |
| 641 |
| 642 /* free memory and close file */ |
| 643 if (state->size) { |
| 644 inflateEnd(&(state->strm)); |
| 645 free(state->out); |
| 646 free(state->in); |
| 647 } |
| 648 gz_error(state, Z_OK, NULL); |
| 649 free(state->path); |
| 650 ret = close(state->fd); |
| 651 free(state); |
| 652 return ret ? Z_ERRNO : Z_OK; |
| 653 } |
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