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));
}
public override 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);
ObjectSize = Utilities.ToUInt64LittleEndian(buffer, offset + 64);
LogicalBlocksRecorded = Utilities.ToUInt64LittleEndian(buffer, offset + 72);
AccessTime = UdfUtilities.ParseTimestamp(buffer, offset + 80);
ModificationTime = UdfUtilities.ParseTimestamp(buffer, offset + 92);
CreationTime = UdfUtilities.ParseTimestamp(buffer, offset + 104);
AttributeTime = UdfUtilities.ParseTimestamp(buffer, offset + 116);
Checkpoint = Utilities.ToUInt32LittleEndian(buffer, offset + 128);
ExtendedAttributeIcb = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 136);
StreamDirectoryIcb = Utilities.ToStruct <LongAllocationDescriptor>(buffer, offset + 152);
ImplementationIdentifier = Utilities.ToStruct <ImplementationEntityIdentifier>(buffer, offset + 168);
UniqueId = Utilities.ToUInt64LittleEndian(buffer, offset + 200);
ExtendedAttributesLength = Utilities.ToInt32LittleEndian(buffer, offset + 208);
AllocationDescriptorsLength = Utilities.ToInt32LittleEndian(buffer, offset + 212);
AllocationDescriptors = Utilities.ToByteArray(buffer, offset + 216 + ExtendedAttributesLength, AllocationDescriptorsLength);
byte[] eaData = Utilities.ToByteArray(buffer, offset + 216, ExtendedAttributesLength);
ExtendedAttributes = ReadExtendedAttributes(eaData);
return((int)(216 + 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 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 LoadExtents()
{
_extents = new List <CookedExtent>();
byte[] activeBuffer = _fileEntry.AllocationDescriptors;
AllocationType allocType = _fileEntry.InformationControlBlock.AllocationType;
if (allocType == AllocationType.ShortDescriptors)
{
long filePos = 0;
int i = 0;
while (i < activeBuffer.Length)
{
ShortAllocationDescriptor sad = Utilities.ToStruct <ShortAllocationDescriptor>(activeBuffer, i);
if (sad.ExtentLength == 0)
{
break;
}
if (sad.Flags != ShortAllocationFlags.RecordedAndAllocated)
{
throw new NotImplementedException("Extents that are not 'recorded and allocated' not implemented");
}
CookedExtent newExtent = new CookedExtent
{
FileContentOffset = filePos,
Partition = int.MaxValue,
StartPos = sad.ExtentLocation * (long)_blockSize,
Length = sad.ExtentLength
};
_extents.Add(newExtent);
filePos += sad.ExtentLength;
i += sad.Size;
}
}
else if (allocType == AllocationType.Embedded)
{
// do nothing
}
else if (allocType == AllocationType.LongDescriptors)
{
long filePos = 0;
int i = 0;
while (i < activeBuffer.Length)
{
LongAllocationDescriptor lad = Utilities.ToStruct <LongAllocationDescriptor>(activeBuffer, i);
if (lad.ExtentLength == 0)
{
break;
}
CookedExtent newExtent = new CookedExtent
{
FileContentOffset = filePos,
Partition = lad.ExtentLocation.Partition,
StartPos = lad.ExtentLocation.LogicalBlock * (long)_blockSize,
Length = lad.ExtentLength
};
_extents.Add(newExtent);
filePos += lad.ExtentLength;
i += lad.Size;
}
}
else
{
throw new NotImplementedException("Allocation Type: " + _fileEntry.InformationControlBlock.AllocationType);
}
}
