Function CARDReadAsync

src/dolphin/src/card/CARDRead.c:104–139

}

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 = __CARDIsReadable(card, 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;
}

s32 CARDRead(CARDFileInfo *fileInfo, void *buffer, s32 length, s32 offset)
{