/*!
Reads a single mode1 form1 or form2 sector from cd device
into data starting from lsn. Returns 0 if no error.
*/
int
cdio_read_mode1_sector (const CdIo *cdio, void *data, lsn_t lsn, bool is_form2)
{
uint32_t size = is_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
char buf[M2RAW_SECTOR_SIZE] = { 0, };
int ret;
cdio_assert (cdio != NULL);
cdio_assert (data != NULL);
if (cdio->op.lseek && cdio->op.read) {
if (0 > cdio_lseek(cdio, CDIO_CD_FRAMESIZE*lsn, SEEK_SET))
return -1;
if (0 > cdio_read(cdio, buf, CDIO_CD_FRAMESIZE))
return -1;
memcpy (data, buf, size);
return 0;
} else {
ret = cdio_read_mode2_sector(cdio, data, lsn, is_form2);
if (ret == 0)
memcpy (data, buf+CDIO_CD_SUBHEADER_SIZE, size);
}
return ret;
}
/*!
Reads a single mode1 form1 or form2 sector from cd device
into data starting from lsn. Returns DRIVER_OP_SUCCESS if no error.
*/
driver_return_code_t
cdio_read_mode1_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
bool b_form2)
{
uint32_t size = b_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
check_lsn(i_lsn);
if (p_cdio->op.read_mode1_sector) {
return p_cdio->op.read_mode1_sector(p_cdio->env, p_buf, i_lsn, b_form2);
} else if (p_cdio->op.lseek && p_cdio->op.read) {
char buf[M2RAW_SECTOR_SIZE] = { 0, };
if (0 > cdio_lseek(p_cdio, CDIO_CD_FRAMESIZE*i_lsn, SEEK_SET))
return -1;
if (0 > cdio_read(p_cdio, buf, CDIO_CD_FRAMESIZE))
return -1;
memcpy (p_buf, buf, size);
return DRIVER_OP_SUCCESS;
}
return DRIVER_OP_UNSUPPORTED;
}
/*!
Reads into buf the next size bytes.
Similar to (if not the same as) libc's read()
@param p_buf place to read data into. The caller should make sure
this location can store at least i_size bytes.
@param i_size number of bytes to read
@return (ssize_t) -1 on error.
*/
ssize_t read(void *p_buf, size_t i_size)
{
return cdio_read(p_cdio, p_buf, i_size);
}
