public XnbFile <T> Deserialize <T>(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var xnbResult = new XnbFile <T>();
var xnbStreamReader = new XnbStreamReader(stream);
// check if file starts with XNB
ValidatePrefix(xnbStreamReader);
// read the XNB target OS
xnbResult.XnbTargetOs = ReadTargetOs(xnbStreamReader);
// read the XNB format version
xnbResult.FormatVersion = ReadFormatVersion(xnbStreamReader);
// read the XNB flag
var flags = xnbResult.Flags = ReadFlags(xnbStreamReader);
// read the file size
var size = xnbResult.Size = (int)xnbStreamReader.ReadUInt32();
// check if encoded. If so, decode stream
xnbStreamReader = DecodeXnbStreamReader(xnbStreamReader, flags, size);
var xnbReaderManager = new XnbReaderManager();
xnbReaderManager.ReadReaders(xnbStreamReader);
// ensure there are no shared resources
var sharedResourcesCount = xnbStreamReader.Read7BitEncodedInt();
if (sharedResourcesCount != 0)
{
throw new NotSupportedException("Shared resources are not supported");
}
int readerIndex = xnbStreamReader.Read7BitEncodedInt();
var reader = xnbReaderManager.XnbReaderFromIndex(readerIndex);
if (reader == null)
{
xnbResult.Content = default(T);
}
else if (reader.Read(xnbReaderManager, xnbStreamReader) is T content)
{
xnbResult.Content = content;
}
else
{
throw new XnbException("Invalid type");
}
return(xnbResult);
}
private XnbStreamReader DecodeXnbStreamReader(XnbStreamReader endcodedXnbStreamReader, XnbFlags flags, int size)
{
// check if file size is equal to stream size
if (endcodedXnbStreamReader.BaseStream.Length != size)
{
throw new XnbException("XNB file has been truncated!");
}
// check if stream is compressed
if (!flags.HasFlag(XnbFlags.ContentCompressedLzx))
{
return(endcodedXnbStreamReader);
}
var decompressedSize = (int)endcodedXnbStreamReader.ReadUInt32();
var compressedSize = size - XnbCompressedPrologueSize;
var decompressedStream = new LzxDecoderStream(endcodedXnbStreamReader.BaseStream, decompressedSize, compressedSize);
return(new XnbStreamReader(decompressedStream));
}
