-- see zlib.h -- */
(file, buf, len)
| 376 | |
| 377 | /* -- see zlib.h -- */ |
| 378 | int ZEXPORT gzread(file, buf, len) |
| 379 | gzFile file; |
| 380 | voidp buf; |
| 381 | unsigned len; |
| 382 | { |
| 383 | gz_statep state; |
| 384 | |
| 385 | /* get internal structure */ |
| 386 | if (file == NULL) |
| 387 | return -1; |
| 388 | state = (gz_statep)file; |
| 389 | |
| 390 | /* check that we're reading and that there's no (serious) error */ |
| 391 | if (state->mode != GZ_READ || |
| 392 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) |
| 393 | return -1; |
| 394 | |
| 395 | /* since an int is returned, make sure len fits in one, otherwise return |
| 396 | with an error (this avoids a flaw in the interface) */ |
| 397 | if ((int)len < 0) { |
| 398 | gz_error(state, Z_STREAM_ERROR, "request does not fit in an int"); |
| 399 | return -1; |
| 400 | } |
| 401 | |
| 402 | /* read len or fewer bytes to buf */ |
| 403 | len = gz_read(state, buf, len); |
| 404 | |
| 405 | /* check for an error */ |
| 406 | if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR) |
| 407 | return -1; |
| 408 | |
| 409 | /* return the number of bytes read (this is assured to fit in an int) */ |
| 410 | return (int)len; |
| 411 | } |
| 412 | |
| 413 | /* -- see zlib.h -- */ |
| 414 | z_size_t ZEXPORT gzfread(buf, size, nitems, file) |