public void Export(BasePakEntry uasset, BasePakEntry uexp, BasePakEntry ubulk)
{
if (uasset == null || uexp == null)
{
return;
}
var assetStream = new FPakFile(Reader, uasset, Aes).GetStream();
var expStream = new FPakFile(Reader, uexp, Aes).GetStream();
var bulkStream = ubulk == null ? null : new FPakFile(Reader, ubulk, Aes).GetStream();
try
{
var exports = new AssetReader(assetStream, expStream, bulkStream).Exports;
if (exports[0] is Texture2D)
{
var tex = exports[0] as Texture2D;
tex.GetImage();
}
}
catch (IndexOutOfRangeException) { }
catch (NotImplementedException) { }
catch (IOException) { }
catch (Exception e)
{
DebugHelper.WriteException(e, "thrown in PakReader.cs by Export");
}
}
public Stream GetPackageStream(BasePakEntry entry)
{
lock (Reader)
{
return(new FPakFile(Reader, entry, Aes).GetStream());
}
}
const int EncryptedBufferSize = 256; //?? TODO: check - may be value 16 will be better for performance
public FPakFile(BinaryReader Reader, BasePakEntry Info, byte[] key = null)
{
Reader.BaseStream.Seek(Info.Pos + Info.StructSize, SeekOrigin.Begin);
if (Info.Encrypted)
{
long encSize = (Info.Size & 15) == 0 ? Info.Size : ((Info.Size / 16) + 1) * 16;
byte[] encBuffer = Reader.ReadBytes((int)encSize);
data = AESDecryptor.DecryptAES(encBuffer, (int)encSize, key, key.Length).SubArray(0, (int)Info.UncompressedSize);
if (encSize != Info.Size)
{
data = data.SubArray(0, (int)Info.UncompressedSize);
}
}
else
{
data = Reader.ReadBytes((int)Info.UncompressedSize);
}
//File.WriteAllBytes(Path.GetFileName(info.Name), data);
/*
* if (info.CompressionMethod != 0)
* {
* Console.WriteLine("compressed");
* while (size > 0)
* {
* if ((UncompressedBuffer == null) || (ArPos < UncompressedBufferPos) || (ArPos >= UncompressedBufferPos + Info.CompressionBlockSize))
* {
* // buffer is not ready
* if (UncompressedBuffer == null)
* {
* UncompressedBuffer = new byte[Info.CompressionBlockSize];
* }
* // prepare buffer
* int BlockIndex = ArPos / Info.CompressionBlockSize;
* UncompressedBufferPos = Info.CompressionBlockSize * BlockIndex;
*
* FPakCompressedBlock Block = Info.CompressionBlocks[BlockIndex];
* int CompressedBlockSize = (int)(Block.CompressedEnd - Block.CompressedStart);
* int UncompressedBlockSize = Math.Min(Info.CompressionBlockSize, (int)Info.UncompressedSize - UncompressedBufferPos); // don't pass file end
*
* byte[] CompressedData;
* if (Info.bEncrypted == 0)
* {
* Reader.BaseStream.Seek(Block.CompressedStart, SeekOrigin.Begin);
* CompressedData = Reader.ReadBytes(CompressedBlockSize);
* }
* else
* {
* int EncryptedSize = Align(CompressedBlockSize, EncryptionAlign);
* Reader.BaseStream.Seek(Block.CompressedStart, SeekOrigin.Begin);
* CompressedData = Reader.ReadBytes(EncryptedSize);
* CompressedData = AESDecryptor.DecryptAES(CompressedData, EncryptedSize, key, key.Length);
* }
* // appDecompress(CompressedData, CompressedBlockSize, UncompressedBuffer, UncompressedBlockSize, Info.CompressionMethod);
* // https://github.com/gildor2/UModel/blob/39641f9e58cb4c286dde5f191e5db9a24b19f503/Unreal/UnCoreCompression.cpp#L183
* throw new NotImplementedException("Decompressing of files aren't written yet");
* }
*
* // data is in buffer, copy it
* int BytesToCopy = UncompressedBufferPos + Info.CompressionBlockSize - ArPos; // number of bytes until end of the buffer
* if (BytesToCopy > size) BytesToCopy = size;
* if (BytesToCopy <= 0)
* {
* throw new ArgumentOutOfRangeException("Bytes to copy is invalid");
* }
*
* // copy uncompressed data
* int OffsetInBuffer = ArPos - UncompressedBufferPos;
* Buffer.BlockCopy(UncompressedBuffer, OffsetInBuffer, data, dataOffset, BytesToCopy);
*
* // advance pointers
*
* // ArPos += BytesToCopy;
* size -= BytesToCopy;
* dataOffset += BytesToCopy;
* }
* throw new NotImplementedException("Decompressing of files aren't written yet");
* }
* else if (Info.bEncrypted != 0)
* {
* Console.WriteLine("Encrypted");
* // Uncompressed encrypted data. Reuse compression fields to handle decryption efficiently
* if (UncompressedBuffer == null)
* {
* UncompressedBuffer = new byte[EncryptedBufferSize];
* UncompressedBufferPos = 0x40000000; // some invalid value
* }
*
* while (size > 0)
* {
* if ((ArPos < UncompressedBufferPos) || (ArPos >= UncompressedBufferPos + EncryptedBufferSize))
* {
* // Should fetch block and decrypt it.
* // Note: AES is block encryption, so we should always align read requests for correct decryption.
* UncompressedBufferPos = ArPos & ~(EncryptionAlign - 1);
* Reader.BaseStream.Seek(Info.Pos + Info.StructSize + UncompressedBufferPos, SeekOrigin.Begin);
* int RemainingSize = (int)Info.Size;
* if (RemainingSize >= 0)
* {
* if (RemainingSize > EncryptedBufferSize)
* RemainingSize = EncryptedBufferSize;
* RemainingSize = Align(RemainingSize, EncryptionAlign); // align for AES, pak contains aligned data
* UncompressedBuffer = Reader.ReadBytes(RemainingSize);
* UncompressedBuffer = AESDecryptor.DecryptAES(UncompressedBuffer, RemainingSize, key, key.Length);
* }
* }
*
* // Now copy decrypted data from UncompressedBuffer (code is very similar to those used in decompression above)
* int BytesToCopy = UncompressedBufferPos + EncryptedBufferSize - ArPos; // number of bytes until end of the buffer
* if (BytesToCopy > size) BytesToCopy = size;
* if (BytesToCopy <= 0)
* {
* throw new ArgumentOutOfRangeException("Bytes to copy is invalid");
* }
*
* // copy uncompressed data
* int OffsetInBuffer = ArPos - UncompressedBufferPos;
* Buffer.BlockCopy(UncompressedBuffer, OffsetInBuffer, data, dataOffset, BytesToCopy);
*
* // advance pointers
*
* // ArPos += BytesToCopy;
* size -= BytesToCopy;
* dataOffset += BytesToCopy;
* }
* throw new NotImplementedException("Decryption of files aren't written yet");
* }
* else
* {
* // Pure data
* // seek every time in a case if the same 'Reader' was used by different FPakFile
* // (this is a lightweight operation for buffered FArchive)
* Reader.BaseStream.Seek(Info.Pos + Info.StructSize, SeekOrigin.Begin);
* data = Reader.ReadBytes(size);
* // ArPos += size;
* }*/
}
