public FileResourceStream(Stream baseStream, ShortResourceHeader header, bool lzxCompression, int chunkSize)
{
_baseStream = baseStream;
_header = header;
_lzxCompression = lzxCompression;
_chunkSize = chunkSize;
if (baseStream.Length > uint.MaxValue)
{
throw new NotImplementedException("Large files >4GB");
}
int numChunks = (int)Utilities.Ceil(header.OriginalSize, _chunkSize);
_chunkOffsets = new long[numChunks];
_chunkLength = new long[numChunks];
for (int i = 1; i < numChunks; ++i)
{
_chunkOffsets[i] = Utilities.ToUInt32LittleEndian(Utilities.ReadFully(_baseStream, 4), 0);
_chunkLength[i - 1] = _chunkOffsets[i] - _chunkOffsets[i - 1];
}
_chunkLength[numChunks - 1] = (_baseStream.Length - _baseStream.Position) - _chunkOffsets[numChunks - 1];
_offsetDelta = _baseStream.Position;
_currentChunk = -1;
}
public void Read(byte[] buffer, int offset)
{
Tag = Utilities.BytesToString(buffer, offset, 8);
HeaderSize = Utilities.ToUInt32LittleEndian(buffer, 8);
Version = Utilities.ToUInt32LittleEndian(buffer, 12);
Flags = (FileFlags)Utilities.ToUInt32LittleEndian(buffer, 16);
CompressionSize = Utilities.ToInt32LittleEndian(buffer, 20);
WimGuid = Utilities.ToGuidLittleEndian(buffer, 24);
PartNumber = Utilities.ToUInt16LittleEndian(buffer, 40);
TotalParts = Utilities.ToUInt16LittleEndian(buffer, 42);
ImageCount = Utilities.ToUInt32LittleEndian(buffer, 44);
OffsetTableHeader = new ShortResourceHeader();
OffsetTableHeader.Read(buffer, 48);
XmlDataHeader = new ShortResourceHeader();
XmlDataHeader.Read(buffer, 72);
BootMetaData = new ShortResourceHeader();
BootMetaData.Read(buffer, 96);
BootIndex = Utilities.ToUInt32LittleEndian(buffer, 120);
IntegrityHeader = new ShortResourceHeader();
IntegrityHeader.Read(buffer, 124);
}
public void Read(byte[] buffer, int offset)
{
Header = new ShortResourceHeader();
Header.Read(buffer, offset);
PartNumber = Utilities.ToUInt16LittleEndian(buffer, offset + ShortResourceHeader.Size);
RefCount = Utilities.ToUInt32LittleEndian(buffer, offset + ShortResourceHeader.Size + 2);
Hash = new byte[20];
Array.Copy(buffer, offset + ShortResourceHeader.Size + 6, Hash, 0, 20);
}
internal SparseStream OpenResourceStream(ShortResourceHeader hdr)
{
SparseStream fileSectionStream = new SubStream(_fileStream, Ownership.None, hdr.FileOffset, hdr.CompressedSize);
if ((hdr.Flags & ResourceFlags.Compressed) == 0)
{
return fileSectionStream;
}
return new FileResourceStream(fileSectionStream, hdr, (_fileHeader.Flags & FileFlags.LzxCompression) != 0, _fileHeader.CompressionSize);
}
