/// <summary>
/// Retrieves the requested chunk from the region, or
/// generates it if a world generator is provided.
/// </summary>
/// <param name="position">The position of the requested local chunk coordinates.</param>
public IChunk GetChunk(Coordinates2D position)
{
// TODO: This could use some refactoring
lock (Chunks)
{
if (!Chunks.ContainsKey(position))
{
if (regionFile != null)
{
// Search the stream for that region
lock (regionFile)
{
var chunkData = GetChunkFromTable(position);
if (chunkData == null)
{
if (World.ChunkProvider == null)
{
throw new ArgumentException("The requested chunk is not loaded.", "position");
}
GenerateChunk(position);
return(Chunks[position]);
}
regionFile.Seek(chunkData.Item1, SeekOrigin.Begin);
/*int length = */ new MinecraftStream(regionFile).ReadInt32(); // TODO: Avoid making new objects here, and in the WriteInt32
int compressionMode = regionFile.ReadByte();
switch (compressionMode)
{
case 1: // gzip
throw new NotImplementedException("gzipped chunks are not implemented");
case 2: // zlib
var nbt = new NbtFile();
nbt.LoadFromStream(regionFile, NbtCompression.ZLib, null);
var chunk = Chunk.FromNbt(nbt);
Chunks.Add(position, chunk);
break;
default:
throw new InvalidDataException("Invalid compression scheme provided by region file.");
}
}
}
else if (World.ChunkProvider == null)
{
throw new ArgumentException("The requested chunk is not loaded.", "position");
}
else
{
GenerateChunk(position);
}
}
return(Chunks[position]);
}
}
