| #pragma mark -␊ |
| ␊ |
| static␊ |
| int FATCacheInit(void)␊ |
| int FATCacheInit(int invalidate)␊ |
| {␊ |
| ␉if (!gFATCacheBuffer)␊ |
| ␉{␊ |
|
| ␉␉{␊ |
| ␉␉␉return -1;␊ |
| ␉␉}␊ |
| ␉␉invalidate = 1;␊ |
| ␉}␊ |
| ␉gCachedFATBlockAddress = INVALID_FAT_ADDRESS;␊ |
| ␉if (invalidate)␊ |
| ␉{␊ |
| ␉␉gCachedFATBlockAddress = INVALID_FAT_ADDRESS;␊ |
| ␉}␊ |
| ␉return 0;␊ |
| }␊ |
| ␊ |
|
| ␉␉lcba = cluster >> shift;␊ |
| ␉␉if (lcba != gCachedFATBlockAddress)␊ |
| ␉␉{␊ |
| ␉␉␉Seek(gCurrentIH, (((long long) gFATOffset) << gBPSShift) + (((long long) lcba) << gBPCBShift));␊ |
| ␉␉␉Read(gCurrentIH, (long) gFATCacheBuffer, CacheBlockSize());␊ |
| ␉␉␉CacheRead(gCurrentIH,␊ |
| ␉␉␉␉␉ (char*) gFATCacheBuffer,␊ |
| ␉␉␉␉␉ (((long long) gFATOffset) << gBPSShift) + (((long long) lcba) << gBPCBShift),␊ |
| ␉␉␉␉␉ CacheBlockSize(),␊ |
| ␉␉␉␉␉ 1);␊ |
| ␉␉␉gCachedFATBlockAddress = lcba;␊ |
| ␉␉}␊ |
| ␉␉lcba = cluster + 1;␊ |
|
| ␉␉toRead = (uint16_t) (1 << (gBPCBShift - gBPSShift));␊ |
| ␉␉if (pIter->lsa + toRead > pIter->lsa_end)␊ |
| ␉␉␉toRead = (uint16_t) (pIter->lsa_end - pIter->lsa);␊ |
| ␉␉Seek(gCurrentIH, (long long) (pIter->lsa << gBPSShift));␊ |
| ␉␉Read(gCurrentIH, (long) pIter->buffer, ((long) toRead) << gBPSShift);␊ |
| ␉␉CacheRead(gCurrentIH,␊ |
| ␉␉␉␉ (char*) pIter->buffer,␊ |
| ␉␉␉␉ (long long) (pIter->lsa << gBPSShift),␊ |
| ␉␉␉␉ ((uint32_t) toRead) << gBPSShift,␊ |
| ␉␉␉␉ 1);␊ |
| ␉␉pIter->lsa += toRead;␊ |
| ␉␉pIter->entry_offset = 0;␊ |
| ␉}␊ |
|
| ␉if (!ih)␊ |
| ␉␉return -1;␊ |
| ␉if (gCurrentIH == ih)␊ |
| ␉␉return FATCacheInit();␊ |
| ␉{␊ |
| ␉␉CacheInit(ih, CacheBlockSize());␊ |
| ␉␉return FATCacheInit(0);␊ |
| ␉}␊ |
| ␊ |
| ␉buffer = (uint8_t*) malloc(BPS);␊ |
| ␉if (!buffer)␊ |
|
| ␉␉return -1;␊ |
| ␉}␊ |
| ␊ |
| ␉if (FATCacheInit() < 0) {␊ |
| ␉if (FATCacheInit(1) < 0)␊ |
| ␉{␊ |
| ␉␉free(buffer);␊ |
| ␉␉return -1;␊ |
| ␉}␊ |
|
| ␊ |
| ␉gCurrentIH = ih;␊ |
| ␊ |
| ␉CacheInit(ih, CacheBlockSize());␊ |
| ␊ |
| ␉free(buffer);␊ |
| ␉return 0;␊ |
| }␊ |
