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 virtual int ReadFrom(byte[] buffer, int offset)
{
DescriptorTag = Utilities.ToStruct <DescriptorTag>(buffer, offset);
InformationControlBlock = Utilities.ToStruct <InformationControlBlock>(buffer, offset + 16);
Uid = Utilities.ToUInt32LittleEndian(buffer, offset + 36);
Gid = Utilities.ToUInt32LittleEndian(buffer, offset + 40);
Permissions = (FilePermissions)Utilities.ToUInt32LittleEndian(buffer, offset + 44);
FileLinkCount = Utilities.ToUInt16LittleEndian(buffer, offset + 48);
RecordFormat = buffer[offset + 50];
RecordDisplayAttributes = buffer[offset + 51];
RecordLength = Utilities.ToUInt16LittleEndian(buffer, offset + 52);
InformationLength = Utilities.ToUInt64LittleEndian(buffer, offset + 56);
LogicalBlocksRecorded = Utilities.ToUInt64LittleEndian(buffer, offset + 64);
AccessTime = UdfUtilities.ParseTimestamp(buffer, offset + 72);
ModificationTime = UdfUtilities.ParseTimestamp(buffer, offset + 84);
AttributeTime = UdfUtilities.ParseTimestamp(buffer, offset + 96);
Checkpoint = Utilities.ToUInt32LittleEndian(buffer, offset + 108);
ExtendedAttributeIcb = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 112);
ImplementationIdentifier = Utilities.ToStruct <ImplementationEntityIdentifier>(buffer, offset + 128);
UniqueId = Utilities.ToUInt64LittleEndian(buffer, offset + 160);
ExtendedAttributesLength = Utilities.ToInt32LittleEndian(buffer, offset + 168);
AllocationDescriptorsLength = Utilities.ToInt32LittleEndian(buffer, offset + 172);
AllocationDescriptors = Utilities.ToByteArray(buffer, offset + 176 + ExtendedAttributesLength, AllocationDescriptorsLength);
byte[] eaData = Utilities.ToByteArray(buffer, offset + 176, ExtendedAttributesLength);
ExtendedAttributes = ReadExtendedAttributes(eaData);
return((int)(176 + ExtendedAttributesLength + AllocationDescriptorsLength));
}
public int ReadFrom(byte[] buffer, int offset)
{
DescriptorTag = Utilities.ToStruct <DescriptorTag>(buffer, offset);
FileVersionNumber = Utilities.ToUInt16LittleEndian(buffer, offset + 16);
FileCharacteristics = (FileCharacteristic)buffer[offset + 18];
NameLength = buffer[offset + 19];
FileLocation = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 20);
ImplementationUseLength = Utilities.ToUInt16LittleEndian(buffer, offset + 36);
ImplementationUse = Utilities.ToByteArray(buffer, offset + 38, ImplementationUseLength);
Name = UdfUtilities.ReadDCharacters(buffer, offset + 38 + ImplementationUseLength, NameLength);
return(Utilities.RoundUp(38 + ImplementationUseLength + NameLength, 4));
}
public static bool TryFromStream(Stream stream, out DescriptorTag result)
{
byte[] next = Utilities.ReadFully(stream, 512);
if (!DescriptorTag.IsValid(next, 0))
{
result = null;
return(false);
}
DescriptorTag dt = new DescriptorTag();
dt.ReadFrom(next, 0);
result = dt;
return(true);
}
public int ReadFrom(byte[] buffer, int offset)
{
if (!DescriptorTag.IsValid(buffer, offset))
{
throw new InvalidDataException("Invalid Anchor Volume Descriptor Pointer (invalid tag)");
}
Tag = new DescriptorTag();
Tag.ReadFrom(buffer, offset);
if (UdfUtilities.ComputeCrc(buffer, offset + Tag.Size, Tag.DescriptorCrcLength) != Tag.DescriptorCrc)
{
throw new InvalidDataException("Invalid Anchor Volume Descriptor Pointer (invalid CRC)");
}
return(Parse(buffer, offset));
}
private bool ProbeSectorSize(int size)
{
if (_data.Length < 257 * (long)size)
{
return(false);
}
_data.Position = 256 * (long)size;
DescriptorTag dt;
if (!DescriptorTag.TryFromStream(_data, out dt))
{
return(false);
}
return(dt.TagIdentifier == TagIdentifier.AnchorVolumeDescriptorPointer &&
dt.TagLocation == 256);
}
protected static List <ExtendedAttributeRecord> ReadExtendedAttributes(byte[] eaData)
{
if (eaData != null && eaData.Length != 0)
{
DescriptorTag eaTag = new DescriptorTag();
eaTag.ReadFrom(eaData, 0);
int implAttrLocation = Utilities.ToInt32LittleEndian(eaData, 16);
int appAttrLocation = Utilities.ToInt32LittleEndian(eaData, 20);
List <ExtendedAttributeRecord> extendedAttrs = new List <ExtendedAttributeRecord>();
int pos = 24;
while (pos < eaData.Length)
{
ExtendedAttributeRecord ea;
if (pos >= implAttrLocation)
{
ea = new ImplementationUseExtendedAttributeRecord();
}
else
{
ea = new ExtendedAttributeRecord();
}
int numRead = ea.ReadFrom(eaData, pos);
extendedAttrs.Add(ea);
pos += numRead;
}
return(extendedAttrs);
}
else
{
return(null);
}
}
public int ReadFrom(byte[] buffer, int offset)
{
DescriptorTag = Utilities.ToStruct <DescriptorTag>(buffer, offset);
RecordingTime = UdfUtilities.ParseTimestamp(buffer, offset + 16);
InterchangeLevel = Utilities.ToUInt16LittleEndian(buffer, offset + 28);
MaximumInterchangeLevel = Utilities.ToUInt16LittleEndian(buffer, offset + 30);
CharacterSetList = Utilities.ToUInt32LittleEndian(buffer, offset + 32);
MaximumCharacterSetList = Utilities.ToUInt32LittleEndian(buffer, offset + 36);
FileSetNumber = Utilities.ToUInt32LittleEndian(buffer, offset + 40);
FileSetDescriptorNumber = Utilities.ToUInt32LittleEndian(buffer, offset + 44);
LogicalVolumeIdentifierCharset = Utilities.ToStruct <CharacterSetSpecification>(buffer, offset + 48);
LogicalVolumeIdentifier = UdfUtilities.ReadDString(buffer, offset + 112, 128);
FileSetCharset = Utilities.ToStruct <CharacterSetSpecification>(buffer, offset + 240);
FileSetIdentifier = UdfUtilities.ReadDString(buffer, offset + 304, 32);
CopyrightFileIdentifier = UdfUtilities.ReadDString(buffer, offset + 336, 32);
AbstractFileIdentifier = UdfUtilities.ReadDString(buffer, offset + 368, 32);
RootDirectoryIcb = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 400);
DomainIdentifier = Utilities.ToStruct <DomainEntityIdentifier>(buffer, offset + 416);
NextExtent = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 448);
SystemStreamDirectoryIcb = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 464);
return(512);
}
public static File FromDescriptor(UdfContext context, LongAllocationDescriptor icb)
{
LogicalPartition partition = context.LogicalPartitions[icb.ExtentLocation.Partition];
byte[] rootDirData = UdfUtilities.ReadExtent(context, icb);
DescriptorTag rootDirTag = Utilities.ToStruct <DescriptorTag>(rootDirData, 0);
if (rootDirTag.TagIdentifier == TagIdentifier.ExtendedFileEntry)
{
ExtendedFileEntry fileEntry = Utilities.ToStruct <ExtendedFileEntry>(rootDirData, 0);
if (fileEntry.InformationControlBlock.FileType == FileType.Directory)
{
return(new Directory(context, partition, fileEntry));
}
else
{
return(new File(context, partition, fileEntry, (uint)partition.LogicalBlockSize));
}
}
else if (rootDirTag.TagIdentifier == TagIdentifier.FileEntry)
{
FileEntry fileEntry = Utilities.ToStruct <FileEntry>(rootDirData, 0);
if (fileEntry.InformationControlBlock.FileType == FileType.Directory)
{
return(new Directory(context, partition, fileEntry));
}
else
{
return(new File(context, partition, fileEntry, (uint)partition.LogicalBlockSize));
}
}
else
{
throw new NotImplementedException("Only ExtendedFileEntries implemented");
}
}
private void Initialize()
{
Context = new UdfContext()
{
PhysicalPartitions = new Dictionary <ushort, PhysicalPartition>(),
PhysicalSectorSize = (int)_sectorSize,
LogicalPartitions = new List <LogicalPartition>(),
};
IBuffer dataBuffer = new StreamBuffer(_data, Ownership.None);
AnchorVolumeDescriptorPointer avdp = AnchorVolumeDescriptorPointer.FromStream(_data, 256, _sectorSize);
uint sector = avdp.MainDescriptorSequence.Location;
bool terminatorFound = false;
while (!terminatorFound)
{
_data.Position = sector * (long)_sectorSize;
DescriptorTag dt;
if (!DescriptorTag.TryFromStream(_data, out dt))
{
break;
}
switch (dt.TagIdentifier)
{
case TagIdentifier.PrimaryVolumeDescriptor:
_pvd = PrimaryVolumeDescriptor.FromStream(_data, sector, _sectorSize);
break;
case TagIdentifier.ImplementationUseVolumeDescriptor:
// Not used
break;
case TagIdentifier.PartitionDescriptor:
PartitionDescriptor pd = PartitionDescriptor.FromStream(_data, sector, _sectorSize);
if (Context.PhysicalPartitions.ContainsKey(pd.PartitionNumber))
{
throw new IOException("Duplicate partition number reading UDF Partition Descriptor");
}
Context.PhysicalPartitions[pd.PartitionNumber] = new PhysicalPartition(pd, dataBuffer, _sectorSize);
break;
case TagIdentifier.LogicalVolumeDescriptor:
_lvd = LogicalVolumeDescriptor.FromStream(_data, sector, _sectorSize);
break;
case TagIdentifier.UnallocatedSpaceDescriptor:
// Not used for reading
break;
case TagIdentifier.TerminatingDescriptor:
terminatorFound = true;
break;
default:
break;
}
sector++;
}
// Convert logical partition descriptors into actual partition objects
for (int i = 0; i < _lvd.PartitionMaps.Length; ++i)
{
Context.LogicalPartitions.Add(LogicalPartition.FromDescriptor(Context, _lvd, i));
}
byte[] fsdBuffer = UdfUtilities.ReadExtent(Context, _lvd.FileSetDescriptorLocation);
if (DescriptorTag.IsValid(fsdBuffer, 0))
{
FileSetDescriptor fsd = Utilities.ToStruct <FileSetDescriptor>(fsdBuffer, 0);
RootDirectory = (Directory)File.FromDescriptor(Context, fsd.RootDirectoryIcb);
}
}