void ReadCompressedSegment(BundleSegment segment)
{
m_input.Position = segment.Offset;
int method = segment.Compression & 0x3F;
if (1 == method)
{
m_buffer_len = LzmaDecompressBlock(segment.PackedSize, segment.UnpackedSize);
return;
}
if (null == m_packed || segment.PackedSize > m_packed.Length)
{
m_packed = new byte[segment.PackedSize];
}
int packed_size = m_input.Read(m_packed, 0, (int)segment.PackedSize);
var output = PrepareBuffer(segment.UnpackedSize);
if (3 == method || 2 == method)
{
m_buffer_len = Lz4Compressor.DecompressBlock(m_packed, packed_size, output, (int)segment.UnpackedSize);
}
else
{
throw new NotImplementedException("Not supported Unity asset bundle compression.");
}
}
void ReadCompressedSegment(BundleSegment segment)
{
m_input.Position = segment.Offset;
if (null == m_packed || segment.PackedSize > m_packed.Length)
{
m_packed = new byte[segment.PackedSize];
}
int packed_size = m_input.Read(m_packed, 0, (int)segment.PackedSize);
if (null == m_buffer || segment.UnpackedSize > m_buffer.Length)
{
m_buffer = new byte[segment.UnpackedSize];
}
if (3 == segment.Compression)
{
m_buffer_len = Lz4Compressor.DecompressBlock(m_packed, packed_size, m_buffer, (int)segment.UnpackedSize);
}
else
{
throw new NotImplementedException("Not supported Unity asset bundle compression.");
}
}
public override ArcFile TryOpen(ArcView file)
{
if (!file.View.AsciiEqual(0, "UnityFS\0"))
{
return(null);
}
int arc_version = Binary.BigEndian(file.View.ReadInt32(8));
if (arc_version != 6)
{
return(null);
}
long data_offset;
byte[] index_data;
using (var input = file.CreateStream())
{
input.Position = 0xC;
input.ReadCString(Encoding.UTF8);
input.ReadCString(Encoding.UTF8);
long file_size = Binary.BigEndian(input.ReadInt64());
int packed_index_size = Binary.BigEndian(input.ReadInt32());
int index_size = Binary.BigEndian(input.ReadInt32());
int flags = Binary.BigEndian(input.ReadInt32());
long index_offset;
if (0 == (flags & 0x80))
{
index_offset = input.Position;
data_offset = index_offset + packed_index_size;
}
else
{
index_offset = file_size - packed_index_size;
data_offset = input.Position;
}
input.Position = index_offset;
var packed = input.ReadBytes(packed_index_size);
switch (flags & 0x3F)
{
case 0:
index_data = packed;
break;
case 1:
index_data = UnpackLzma(packed, index_size);
break;
case 3:
index_data = new byte[index_size];
Lz4Compressor.DecompressBlock(packed, packed.Length, index_data, index_data.Length);
break;
default:
return(null);
}
}
var index = new AssetDeserializer(file, data_offset);
using (var input = new BinMemoryStream(index_data))
index.Parse(input);
var dir = index.LoadObjects();
return(new UnityBundle(file, this, dir, index.Segments, index.Bundles));
}
public static string GetLibraryName()
{
return(Lz4Compressor.GetLibraryName());
}