/** @brief Read sectors from a disk.
@param bVolNum The volume number of the volume whose block device
is being read from.
@param ullSectorStart The starting sector number.
@param ulSectorCount The number of sectors to read.
@param pBuffer The buffer into which to read the sector data.
@return A negated ::REDSTATUS code indicating the operation result.
@retval 0 Operation was successful.
@retval -RED_EIO A disk I/O error occurred.
*/
static REDSTATUS DiskRead(
uint8_t bVolNum,
uint64_t ullSectorStart,
uint32_t ulSectorCount,
void *pBuffer)
{
REDSTATUS ret = 0;
F_DRIVER *pDriver = gapFDriver[bVolNum];
if(pDriver == NULL)
{
ret = -RED_EINVAL;
}
else
{
uint8_t *pbBuffer = CAST_VOID_PTR_TO_UINT8_PTR(pBuffer);
uint32_t ulSectorSize = gaRedVolConf[bVolNum].ulSectorSize;
uint32_t ulSectorIdx;
int iErr;
for(ulSectorIdx = 0U; ulSectorIdx < ulSectorCount; ulSectorIdx++)
{
iErr = pDriver->readsector(pDriver, &pbBuffer[ulSectorIdx * ulSectorSize],
CAST_ULONG(ullSectorStart + ulSectorCount));
if(iErr != 0)
{
ret = -RED_EIO;
break;
}
}
}
return ret;
}
/** @brief Write sectors to a disk.
@param bVolNum The volume number of the volume whose block device
is being written to.
@param ullSectorStart The starting sector number.
@param ulSectorCount The number of sectors to write.
@param pBuffer The buffer from which to write the sector data.
@return A negated ::REDSTATUS code indicating the operation result.
@retval 0 Operation was successful.
@retval -RED_EINVAL The block device is not open.
@retval -RED_EIO A disk I/O error occurred.
*/
static REDSTATUS DiskWrite(
uint8_t bVolNum,
uint64_t ullSectorStart,
uint32_t ulSectorCount,
const void *pBuffer)
{
REDSTATUS ret = 0;
F_DRIVER *pDriver = gapFDriver[bVolNum];
if(pDriver == NULL) {
ret = -RED_EINVAL;
} else {
const uint8_t *pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR(pBuffer);
uint32_t ulSectorSize = gaRedVolConf[bVolNum].ulSectorSize;
uint32_t ulSectorIdx;
int iErr;
for(ulSectorIdx = 0U; ulSectorIdx < ulSectorCount; ulSectorIdx++) {
/* We have to cast pbBuffer to non-const since the writesector
prototype is flawed, using a non-const pointer for the buffer.
*/
iErr = pDriver->writesector(pDriver, CAST_AWAY_CONST(uint8_t, &pbBuffer[ulSectorIdx * ulSectorSize]),
CAST_ULONG(ullSectorStart + ulSectorCount));
if(iErr != 0) {
ret = -RED_EIO;
break;
}
}
}
return ret;
}
