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)
{
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);
}
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;
}
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 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)
{
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);
}
