public static McaChunk ReadChunk(byte[] buffer, int dx, int dz)
{
//from mca file header
int i = 4 * (dx + dz * 32);
int offset = (buffer [i] << 16) | (buffer [i + 1] << 8) | (buffer [i + 2]);
int sectors = buffer [i + 3];
if (offset == 0 && sectors == 0)
return null;
Console.WriteLine("Read Chunk " + dx + "," + dz + " @ " + offset + ":" + sectors);
if (offset == 0 || sectors == 0)
throw new InvalidDataException("zero offset/sector");
offset = offset << 12; //4096 = 2**12
int length = EndianBitConverter.Big.ToInt32(buffer, offset); //byte length
if (((length + 5 - 1) >> 12) + 1 != sectors)
throw new InvalidDataException("Body length is larger than the sectors, " + length + " > " + (sectors * 4096));
if (buffer [offset + 4] != 2)
throw new NotImplementedException("Only support zlib compression");
McaChunk mc = new McaChunk(dx, dz);
MemoryStream ms = new MemoryStream(buffer, offset + 5, length);
using (ZlibStream compressed = new ZlibStream(ms, CompressionMode.Decompress))
{
EndianBinaryReader r = new EndianBinaryReader(EndianBitConverter.Big, compressed);
mc.Tag = Tag.ReadTag(r);
}
return mc;
}
void LoadFromFile(string path)
{
this.path = path;
byte[] buffer = File.ReadAllBytes(path);
for (int dx = 0; dx < 32; dx++)
{
for (int dz = 0; dz < 32; dz++)
{
chunks [dx, dz] = McaChunk.ReadChunk(buffer, dx, dz);
}
}
}
public static McaChunk ReadChunk(byte[] buffer, int dx, int dz)
{
//from mca file header
int i = 4 * (dx + dz * 32);
int offset = (buffer [i] << 16) | (buffer [i + 1] << 8) | (buffer [i + 2]);
int sectors = buffer [i + 3];
if (offset == 0 && sectors == 0)
{
return(null);
}
Console.WriteLine("Read Chunk " + dx + "," + dz + " @ " + offset + ":" + sectors);
if (offset == 0 || sectors == 0)
{
throw new InvalidDataException("zero offset/sector");
}
offset = offset << 12; //4096 = 2**12
int length = EndianBitConverter.Big.ToInt32(buffer, offset); //byte length
if (((length + 5 - 1) >> 12) + 1 != sectors)
{
throw new InvalidDataException("Body length is larger than the sectors, " + length + " > " + (sectors * 4096));
}
if (buffer [offset + 4] != 2)
{
throw new NotImplementedException("Only support zlib compression");
}
McaChunk mc = new McaChunk(dx, dz);
MemoryStream ms = new MemoryStream(buffer, offset + 5, length);
using (ZlibStream compressed = new ZlibStream(ms, CompressionMode.Decompress))
{
EndianBinaryReader r = new EndianBinaryReader(EndianBitConverter.Big, compressed);
mc.Tag = Tag.ReadTag(r);
}
return(mc);
}
