public static ParsedChunkData dataToChunks(NetworkChunkData data, boolean checkForSky) {
Chunk chunks[] = new Chunk[16];
int pos = 0;
int expected = 0;
boolean sky = false;
ShortBuffer buf =
ByteBuffer.wrap(data.getData()).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();
// 0 = Calculate expected length and determine if the packet has skylight.
// 1 = Create chunks from mask and get blocks.
// 2 = Get block light.
// 3 = Get sky light.
for (int pass = 0; pass < 4; pass++) {
for (int ind = 0; ind < 16; ind++) {
if ((data.getMask() & 1 << ind) != 0) {
if (pass == 0) {
// Block length + Blocklight + Skylight length
expected += (4096 * 2) + 2048 + 2048;
}
if (pass == 1) {
chunks[ind] = new Chunk(sky || data.hasSkyLight());
ShortArray3d blocks = chunks[ind].getBlocks();
buf.position(pos / 2);
buf.get(blocks.getData(), 0, blocks.getData().length);
pos += blocks.getData().length * 2;
}
if (pass == 2) {
NibbleArray3d blocklight = chunks[ind].getBlockLight();
System.arraycopy(
data.getData(), pos, blocklight.getData(), 0, blocklight.getData().length);
pos += blocklight.getData().length;
}
if (pass == 3 && (sky || data.hasSkyLight())) {
NibbleArray3d skylight = chunks[ind].getSkyLight();
System.arraycopy(data.getData(), pos, skylight.getData(), 0, skylight.getData().length);
pos += skylight.getData().length;
}
}
}
if (pass == 0) {
// If we have more data than blocks and blocklight combined, there must be skylight data as
// well.
if (data.getData().length >= expected) {
sky = checkForSky;
}
}
}
byte biomeData[] = null;
if (data.isFullChunk()) {
biomeData = new byte[256];
System.arraycopy(data.getData(), pos, biomeData, 0, biomeData.length);
pos += biomeData.length;
}
return new ParsedChunkData(chunks, biomeData);
}
public static NetworkChunkData chunksToData(ParsedChunkData chunks) {
int chunkMask = 0;
boolean fullChunk = chunks.getBiomes() != null;
boolean sky = false;
int length = fullChunk ? chunks.getBiomes().length : 0;
byte[] data = null;
int pos = 0;
ShortBuffer buf = null;
// 0 = Determine length and masks.
// 1 = Add blocks.
// 2 = Add block light.
// 3 = Add sky light.
for (int pass = 0; pass < 4; pass++) {
for (int ind = 0; ind < chunks.getChunks().length; ++ind) {
Chunk chunk = chunks.getChunks()[ind];
if (chunk != null && (!fullChunk || !chunk.isEmpty())) {
if (pass == 0) {
chunkMask |= 1 << ind;
length += chunk.getBlocks().getData().length * 2;
length += chunk.getBlockLight().getData().length;
if (chunk.getSkyLight() != null) {
length += chunk.getSkyLight().getData().length;
}
}
if (pass == 1) {
short blocks[] = chunk.getBlocks().getData();
buf.position(pos / 2);
buf.put(blocks, 0, blocks.length);
pos += blocks.length * 2;
}
if (pass == 2) {
byte blocklight[] = chunk.getBlockLight().getData();
System.arraycopy(blocklight, 0, data, pos, blocklight.length);
pos += blocklight.length;
}
if (pass == 3 && chunk.getSkyLight() != null) {
byte skylight[] = chunk.getSkyLight().getData();
System.arraycopy(skylight, 0, data, pos, skylight.length);
pos += skylight.length;
sky = true;
}
}
}
if (pass == 0) {
data = new byte[length];
buf = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();
}
}
// Add biomes.
if (fullChunk) {
System.arraycopy(chunks.getBiomes(), 0, data, pos, chunks.getBiomes().length);
pos += chunks.getBiomes().length;
}
return new NetworkChunkData(chunkMask, fullChunk, sky, data);
}