/**
* Looks for partition on the disc. Returns 1 if partition found, 0 on error.
* partnum: Number of the partition, starting at 0.
* part: structure to fill with the partition information
*/
static int UDFFindPartition( dvd_reader_t *device, int partnum,
struct Partition *part )
{
uint8_t LogBlock_base[ DVD_VIDEO_LB_LEN + 2048 ];
uint8_t *LogBlock = (uint8_t *)(((uintptr_t)LogBlock_base & ~((uintptr_t)2047)) + 2048);
uint32_t lbnum, MVDS_location, MVDS_length;
uint16_t TagID;
int i, volvalid;
struct avdp_t avdp;
if(!UDFGetAVDP(device, &avdp))
return 0;
/* Main volume descriptor */
MVDS_location = avdp.mvds.location;
MVDS_length = avdp.mvds.length;
part->valid = 0;
volvalid = 0;
part->VolumeDesc[ 0 ] = '\0';
i = 1;
do {
/* Find Volume Descriptor */
lbnum = MVDS_location;
do {
if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 )
TagID = 0;
else
UDFDescriptor( LogBlock, &TagID );
if( ( TagID == 5 ) && ( !part->valid ) ) {
/* Partition Descriptor */
UDFPartition( LogBlock, &part->Flags, &part->Number,
part->Contents, &part->Start, &part->Length );
part->valid = ( partnum == part->Number );
} else if( ( TagID == 6 ) && ( !volvalid ) ) {
/* Logical Volume Descriptor */
if( UDFLogVolume( LogBlock, part->VolumeDesc ) ) {
/* TODO: sector size wrong! */
} else
volvalid = 1;
}
} while( ( lbnum <= MVDS_location + ( MVDS_length - 1 )
/ DVD_VIDEO_LB_LEN ) && ( TagID != 8 )
&& ( ( !part->valid ) || ( !volvalid ) ) );
if( ( !part->valid) || ( !volvalid ) ) {
/* Backup volume descriptor */
MVDS_location = avdp.mvds.location;
MVDS_length = avdp.mvds.length;
}
} while( i-- && ( ( !part->valid ) || ( !volvalid ) ) );
/* We only care for the partition, not the volume */
return part->valid;
}
/**
* Gets a Descriptor .
* Returns 1 if descriptor found, 0 on error.
* id, tagid of descriptor
* bufsize, size of BlockBuf (must be >= DVD_VIDEO_LB_LEN)
* and aligned for raw/O_DIRECT read.
*/
static int UDFGetDescriptor( dvd_reader_t *device, int id,
uint8_t *descriptor, int bufsize)
{
uint32_t lbnum, MVDS_location, MVDS_length;
struct avdp_t avdp;
uint16_t TagID;
uint32_t lastsector;
int i, terminate;
int desc_found = 0;
/* Find Anchor */
lastsector = 0;
lbnum = 256; /* Try #1, prime anchor */
terminate = 0;
if(bufsize < DVD_VIDEO_LB_LEN) {
return 0;
}
if(!UDFGetAVDP(device, &avdp)) {
return 0;
}
/* Main volume descriptor */
MVDS_location = avdp.mvds.location;
MVDS_length = avdp.mvds.length;
i = 1;
do {
/* Find Descriptor */
lbnum = MVDS_location;
do {
if( DVDReadLBUDF( device, lbnum++, 1, descriptor, 0 ) <= 0 ) {
TagID = 0;
} else {
UDFDescriptor( descriptor, &TagID );
}
if( (TagID == id) && ( !desc_found ) ) {
/* Descriptor */
desc_found = 1;
}
} while( ( lbnum <= MVDS_location + ( MVDS_length - 1 )
/ DVD_VIDEO_LB_LEN ) && ( TagID != 8 )
&& ( !desc_found) );
if( !desc_found ) {
/* Backup volume descriptor */
MVDS_location = avdp.rvds.location;
MVDS_length = avdp.rvds.length;
}
} while( i-- && ( !desc_found ) );
return desc_found;
}
/**
* Looks for partition on the disc. Returns 1 if partition found, 0 on error.
* partnum: Number of the partition, starting at 0.
* part: structure to fill with the partition information
*/
static int UDFFindPartition( UDF_DATA *device, int partnum,
struct Partition *part )
{
uint8_t LogBlock_base[ DVD_VIDEO_LB_LEN + 2048 ];
uint8_t *LogBlock = (uint8_t *)(((uintptr_t)LogBlock_base & ~((uintptr_t)2047)) + 2048);
uint32_t lbnum, MVDS_location, MVDS_length;
uint16_t TagID;
int i, volvalid;
struct avdp_t avdp;
uint8_t file_type;
if(!UDFGetAVDP(device, &avdp))
return 0;
/* Main volume descriptor */
MVDS_location = avdp.mvds.location;
MVDS_length = avdp.mvds.length;
part->valid = 0;
volvalid = 0;
//part->VolumeDesc[ 0 ] = '\0';
i = 1;
do {
/* Find Volume Descriptor */
lbnum = MVDS_location;
do {
if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 ) {
return 0;
TagID = 0;
} else
UDFDescriptor( LogBlock, &TagID );
if( ( TagID == 5 ) && ( !part->valid ) ) {
/* Partition Descriptor */
UDFPartition( LogBlock, &part->Flags, &part->Number,
part->Contents, &part->Start, &part->Length );
part->valid = ( partnum == part->Number );
} else if( ( TagID == 6 ) && ( !volvalid ) ) {
/* Logical Volume Descriptor */
if( UDFLogVolume( LogBlock, &part->vol) ) {
/* TODO: sector size wrong! */
} else
volvalid = 1;
}
} while( ( lbnum <= MVDS_location + ( MVDS_length - 1 )
/ DVD_VIDEO_LB_LEN ) && ( TagID != 8 )
&& ( ( !part->valid ) || ( !volvalid ) ) );
if( ( !part->valid) || ( !volvalid ) ) {
/* Backup volume descriptor */
MVDS_location = avdp.mvds.location;
MVDS_length = avdp.mvds.length;
}
} while( i-- && ( ( !part->valid ) || ( !volvalid ) ) );
/* load metadata for udf 2.50 */
if (volvalid == 1)
{
struct PartitionMaps *Maps;
for (i = 0; i < (int)part->vol.MapNum; i++)
{
Maps = &part->vol.Maps[i];
if (Maps->MapType == UDF_METADATA_MAP25)
{
/* metadta file location */
//printf("metadata at partition: %d loc: %d\n", Maps->PartitionNum, Maps->mdata.meta_file_loc);
lbnum = UDFGetBlock(part, Maps->PartitionNum, Maps->mdata.meta_file_loc);
if( DVDReadLBUDF( device, lbnum, 1, LogBlock, 0 ) <= 0 )
{
} else {
UDFDescriptor( LogBlock, &TagID );
if (TagID == 266)
{
UDFExtFileEntry(LogBlock, &file_type, part, &Maps->meta_ad);
}
//UDFExtFileEntry(LogBlock, part, &Maps->meta_ad);
//printf("ad: %u, %u, %x, %u\n", Maps->meta_ad.Location, Maps->meta_ad.Length, Maps->meta_ad.Flags, Maps->meta_ad.Partition);
}
//printf("mirror at partition: %d loc: %d\n", Maps->PartitionNum, Maps->mdata.mirror_file_loc);
/*
if( DVDReadLBUDF( device, part->Start + Maps->mdata.mirror_file_loc, 1, LogBlock, 0 ) <= 0 )
{
} else {
printf("%02x %02x %02x %02x\n", LogBlock[0], LogBlock[1], LogBlock[2], LogBlock[3]);
}
*/
}
}
// use file set descriptor to find root icb
/*
lbnum = UDFGetBlock(part, part->vol.FSD.Partition, part->vol.FSD.Location);
if( DVDReadLBUDF( device, lbnum, 1, LogBlock, 0 ) <= 0 )
{
} else {
printf("%02x %02x\n", LogBlock[0], LogBlock[1]);
}
*/
}
/* We only care for the partition, not the volume */
return part->valid;
}