public static CachedChunk LoadChunk(WorldServer world, Vector3i chunkPos)
{
var region = ChunkToRegion(chunkPos);
var regionFilename = Path.Combine(WorldFolder, RegionsFolder, GetRegionFilename(region));
var indexFile = new FileInfo(regionFilename + RegionIndexExt);
var dataFile = new FileInfo(regionFilename + RegionDataExt);
if (!indexFile.Exists || !dataFile.Exists)
{
return(null);
}
//Get chunk data position and length
int chunkDataPosition, chunkDataLength;
var chunkIndexPosition = GetChunkIndexPosition(chunkPos);
lock (IndexLockObject)
{
var chunkIndexData = GetIndexData(region, indexFile);
chunkDataPosition = BitConverter.ToInt32(chunkIndexData, chunkIndexPosition);
chunkDataLength = BitConverter.ToInt32(chunkIndexData, chunkIndexPosition + sizeof(int));
}
if (chunkDataPosition == IndexFileNull || chunkDataLength == IndexFileNull)
{
return(null);
}
//Read chunk data
byte[] chunkData;
lock (DataLockObject)
{
using (var reader = new BinaryReader(dataFile.OpenRead()))
{
reader.BaseStream.Seek(chunkDataPosition, SeekOrigin.Begin);
chunkData = CompressionHelper.DecompressBytes(reader.ReadBytes(chunkDataLength));
}
}
using (var reader = new BinaryReader(new MemoryStream(chunkData)))
{
return(new CachedChunk(world, chunkPos, reader));
}
}
private static byte[] GetIndexData(Vector3i region, FileInfo indexFile)
{
foreach (var cachedIndexData in CachedIndexDatas)
{
if (cachedIndexData.Item1 == region)
{
return(cachedIndexData.Item2);
}
}
var data = CompressionHelper.DecompressBytes(File.ReadAllBytes(indexFile.FullName));
CachedIndexDatas.Add(new Tuple <Vector3i, byte[]>(region, data));
if (CachedIndexDatas.Count > MaxCachedIndexDatas)
{
CachedIndexDatas.RemoveAt(0);
}
return(data);
}
