| 493 | } |
| 494 | |
| 495 | static S32 BFD_read(void* data, S32 elesize, S32 elecnt, tag_xFile* bffp, void* xtradata) |
| 496 | { |
| 497 | st_BINIO_XTRADATA* xtra = (st_BINIO_XTRADATA*)xtradata; |
| 498 | char* dest = (char*)data; |
| 499 | S32 readbeg; |
| 500 | S32 refill = 0; |
| 501 | S32 remain; |
| 502 | S32 actual; |
| 503 | U32 holdpos; |
| 504 | U32 numBytes = 0; |
| 505 | U32 safety = 0; |
| 506 | S32 r26 = elesize * elecnt; |
| 507 | |
| 508 | if (r26 == 0) |
| 509 | { |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | if (!xtra->dbl_buf || xtra->dblbuf_size < 1 || r26 > xtra->dblbuf_size) |
| 514 | { |
| 515 | iFileSeek(bffp, xtra->fpos, IFILE_SEEK_SET); |
| 516 | numBytes = iFileRead(bffp, dest, r26); |
| 517 | |
| 518 | xtra->fpos += numBytes; |
| 519 | } |
| 520 | else |
| 521 | { |
| 522 | remain = r26; |
| 523 | |
| 524 | while (true) |
| 525 | { |
| 526 | if (xtra->fpos < xtra->dbl_beg) |
| 527 | { |
| 528 | refill = 1; |
| 529 | |
| 530 | xtra->dbl_beg = xtra->fpos - (xtra->fpos % xtra->dblbuf_size); |
| 531 | xtra->dbl_end = xtra->dbl_beg + xtra->dblbuf_size; |
| 532 | xtra->dbl_amt = 0; |
| 533 | } |
| 534 | else if (xtra->fpos >= xtra->dbl_end) |
| 535 | { |
| 536 | refill = 1; |
| 537 | |
| 538 | xtra->dbl_beg = xtra->fpos - (xtra->fpos % xtra->dblbuf_size); |
| 539 | xtra->dbl_end = xtra->dbl_beg + xtra->dblbuf_size; |
| 540 | xtra->dbl_amt = 0; |
| 541 | } |
| 542 | |
| 543 | if (refill) |
| 544 | { |
| 545 | holdpos = xtra->fpos; |
| 546 | |
| 547 | iFileSeek(bffp, xtra->dbl_beg, IFILE_SEEK_SET); |
| 548 | |
| 549 | xtra->fpos = holdpos; |
| 550 | xtra->dbl_amt = iFileRead(bffp, xtra->dbl_buf, xtra->dblbuf_size); |
| 551 | } |
| 552 | |