public MetadataPartition(UdfContext context, LogicalVolumeDescriptor volumeDescriptor, MetadataPartitionMap partitionMap)
: base(context, volumeDescriptor)
{
_partitionMap = partitionMap;
PhysicalPartition physical = context.PhysicalPartitions[partitionMap.PartitionNumber];
long fileEntryPos = partitionMap.MetadataFileLocation * (long)volumeDescriptor.LogicalBlockSize;
byte[] entryData = Utilities.ReadFully(physical.Content, fileEntryPos, _context.PhysicalSectorSize);
if (!DescriptorTag.IsValid(entryData, 0))
{
throw new IOException("Invalid descriptor tag looking for Metadata file entry");
}
DescriptorTag dt = Utilities.ToStruct<DescriptorTag>(entryData, 0);
if (dt.TagIdentifier == TagIdentifier.ExtendedFileEntry)
{
ExtendedFileEntry efe = Utilities.ToStruct<ExtendedFileEntry>(entryData, 0);
_metadataFile = new File(context, physical, efe, _volumeDescriptor.LogicalBlockSize);
}
else
{
throw new NotImplementedException("Only EFE implemented for Metadata file entry");
}
}
public FileContentBuffer(UdfContext context, Partition partition, FileEntry fileEntry, uint blockSize)
{
_context = context;
_partition = partition;
_fileEntry = fileEntry;
_blockSize = blockSize;
LoadExtents();
}
public static LogicalPartition FromDescriptor(UdfContext context, LogicalVolumeDescriptor volumeDescriptor, int index)
{
PartitionMap map = volumeDescriptor.PartitionMaps[index];
Type1PartitionMap asType1 = map as Type1PartitionMap;
if (asType1 != null)
{
return new Type1Partition(context, volumeDescriptor, asType1);
}
MetadataPartitionMap asMetadata = map as MetadataPartitionMap;
if (asMetadata != null)
{
return new MetadataPartition(context, volumeDescriptor, asMetadata);
}
throw new NotImplementedException("Unrecognized partition map type");
}
protected LogicalPartition(UdfContext context, LogicalVolumeDescriptor volumeDescriptor)
{
_context = context;
_volumeDescriptor = volumeDescriptor;
}
public static byte[] ReadExtent(UdfContext context, LongAllocationDescriptor extent)
{
LogicalPartition partition = context.LogicalPartitions[extent.ExtentLocation.Partition];
long pos = extent.ExtentLocation.LogicalBlock * partition.LogicalBlockSize;
return Utilities.ReadFully(partition.Content, pos, (int)extent.ExtentLength);
}