internal static T ParseChunk <T>(
BinaryReader reader,
W3dParseContext context,
Func <W3dChunkHeader, T> parseCallback)
where T : W3dChunk
{
var chunkHeader = W3dChunkHeader.Parse(reader);
var startPosition = reader.BaseStream.Position;
var endPosition = startPosition + chunkHeader.ChunkSize;
context.PushChunk(typeof(T).Name, endPosition);
var result = parseCallback(chunkHeader);
result.StartPosition = startPosition;
result.EndPosition = endPosition;
context.PopAsset();
if (reader.BaseStream.Position != endPosition)
{
throw new InvalidDataException($"Error while parsing asset '{typeof(T).Name}'. Expected reader to be at position {endPosition}, but was at {reader.BaseStream.Position}.");
}
return(result);
}
internal static W3dChunkHeader Parse(BinaryReader reader)
{
var result = new W3dChunkHeader();
var chunkSize = reader.ReadUInt32();
result.ChunkSize = chunkSize & 0x7FFFFFFF;
result.HasSubChunks = (chunkSize >> 31) == 1;
return(result);
}
internal void WriteTo(BinaryWriter writer)
{
writer.Write((uint)ChunkType);
var headerPosition = writer.BaseStream.Position;
// We'll back up and overwrite this later.
writer.Seek(W3dChunkHeader.SizeInBytes, SeekOrigin.Current);
var startPosition = writer.BaseStream.Position;
WriteToOverride(writer);
var endPosition = writer.BaseStream.Position;
var dataSize = endPosition - startPosition;
// Back up and write header.
var header = new W3dChunkHeader((uint)dataSize, HasSubChunks);
writer.BaseStream.Position = headerPosition;
header.WriteTo(writer);
writer.BaseStream.Position = endPosition;
}