GeorgesOatesLarsen

Block {
  type: 9,
  metadata: 0,
  light: 0,
  skyLight: 0,
  biome: 
   Biome {
     id: 0,
     color: 112,
     name: 'Ocean',

GeorgesOatesLarsen

packBlockData(rawdata, bitsPerBlock)
  {
  	let blockCount = Chunk.l * Chunk.w * 16;
  	let resultantBuffer = Buffer.alloc(blockCount * bitsPerBlock/8);
  	for (let block = 0; block < blockCount; block++) {
    	//Determine the start-bit for the block.
    	let bit = block * bitsPerBlock;	
    	//Determine the start-byte for that bit.
    	let targetlong = Math.floor(bit/64);
    	//We write backwards from the end of the long. First, we determine the local writing start.

GeorgesOatesLarsen

dump() {	
	//OLD/INTERNAL FORMAT:
	//The first w*l*h*2 bytes are blocks, each of which are shorts.
	//After that, the first w*l*h*0.5 bytes are block-light-levels, each half-bytes.
	//Next, the first w*l*h*0.5 bytes are sky-light-levels, each half-bytes.
	//Finally, the next w*l bytes are biomes.
  
  
  	let outputBuffer = Buffer.alloc(0);
  	

GeorgesOatesLarsen

const fs=require("fs");
var Chunk = require('prismarine-chunk')("1.8");
var Vec3 = require("vec3");

// based on http://wiki.vg/SMP_Map_Format#Format
// testing data from https://download.rom1504.fr/minecraft/chunks/chunks-1.9/
// see http://lunarco.de/minecraft/chunks/ for explanations
// also see https://gist.github.com/Gjum/0375b643ec13a42ab3c0
// and https://github.com/SpockBotMC/SpockBot/blob/0535c31/spockbot/plugins/tools/smpmap.py