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#include <dolphin/card.h>
#include <dolphin/dsp.h>
#include <dolphin/dvd.h>
#include <dolphin/os.h>
#include <dolphin/CARDPriv.h>
s32 __CARDSeek(CARDFileInfo* fileInfo, s32 length, s32 offset, CARDControl** pcard) {
CARDControl* card;
CARDDir* dir;
CARDDir* ent;
s32 result;
u16* fat;
result = __CARDGetControlBlock(fileInfo->chan, &card);
if (result < 0) {
return result;
}
if (!CARDIsValidBlockNo(card, fileInfo->iBlock) ||
card->cBlock * card->sectorSize <= fileInfo->offset) {
return __CARDPutControlBlock(card, CARD_RESULT_FATAL_ERROR);
}
dir = __CARDGetDirBlock(card);
ent = &dir[fileInfo->fileNo];
if (ent->length * card->sectorSize <= offset ||
ent->length * card->sectorSize < offset + length) {
return __CARDPutControlBlock(card, CARD_RESULT_LIMIT);
}
card->fileInfo = fileInfo;
fileInfo->length = length;
if (offset < fileInfo->offset) {
fileInfo->offset = 0;
fileInfo->iBlock = ent->startBlock;
if (!CARDIsValidBlockNo(card, fileInfo->iBlock)) {
return __CARDPutControlBlock(card, CARD_RESULT_BROKEN);
}
}
fat = __CARDGetFatBlock(card);
while (fileInfo->offset < TRUNC(offset, card->sectorSize)) {
fileInfo->offset += card->sectorSize;
fileInfo->iBlock = fat[fileInfo->iBlock];
if (!CARDIsValidBlockNo(card, fileInfo->iBlock)) {
return __CARDPutControlBlock(card, CARD_RESULT_BROKEN);
}
}
fileInfo->offset = offset;
*pcard = card;
return CARD_RESULT_READY;
}
static void ReadCallback(s32 chan, s32 result) {
CARDControl* card;
CARDCallback callback;
u16* fat;
CARDFileInfo* fileInfo;
s32 length;
card = &__CARDBlock[chan];
if (result < 0) {
goto error;
}
fileInfo = card->fileInfo;
if (fileInfo->length < 0) {
result = CARD_RESULT_CANCELED;
goto error;
}
length = (s32)TRUNC(fileInfo->offset + card->sectorSize, card->sectorSize) - fileInfo->offset;
fileInfo->length -= length;
if (fileInfo->length <= 0) {
goto error;
}
fat = __CARDGetFatBlock(card);
fileInfo->offset += length;
fileInfo->iBlock = fat[fileInfo->iBlock];
if (!CARDIsValidBlockNo(card, fileInfo->iBlock)) {
result = CARD_RESULT_BROKEN;
goto error;
}
result = __CARDRead(chan, card->sectorSize * (u32)fileInfo->iBlock,
(fileInfo->length < card->sectorSize) ? fileInfo->length : card->sectorSize,
card->buffer, ReadCallback);
if (result < 0) {
goto error;
}
return;
error:
callback = card->apiCallback;
card->apiCallback = 0;
__CARDPutControlBlock(card, result);
callback(chan, result);
}
s32 CARDReadAsync(CARDFileInfo* fileInfo, void* buf, s32 length, s32 offset,
CARDCallback callback) {
CARDControl* card;
s32 result;
CARDDir* dir;
CARDDir* ent;
if (OFFSET(offset, CARD_SEG_SIZE) != 0 || OFFSET(length, CARD_SEG_SIZE) != 0) {
return CARD_RESULT_FATAL_ERROR;
}
result = __CARDSeek(fileInfo, length, offset, &card);
if (result < 0) {
return result;
}
dir = __CARDGetDirBlock(card);
ent = &dir[fileInfo->fileNo];
result = __CARDAccess(card, ent);
if (result == CARD_RESULT_NOPERM) {
result = __CARDIsWritable(ent);
}
if (result < 0) {
return __CARDPutControlBlock(card, result);
}
DCInvalidateRange(buf, (u32)length);
card->apiCallback = callback ? callback : __CARDDefaultApiCallback;
offset = (s32)OFFSET(fileInfo->offset, card->sectorSize);
length = (length < card->sectorSize - offset) ? length : card->sectorSize - offset;
result = __CARDRead(fileInfo->chan, card->sectorSize * (u32)fileInfo->iBlock + offset, length,
buf, ReadCallback);
if (result < 0) {
__CARDPutControlBlock(card, result);
}
return result;
}
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