refactor and fix map chunk bulk parsing

lib/parser.js

@@ -82,17 +82,15 @@ var readers = {
 };
 
 function readMapChunkBulk (buffer, offset) {
-  var cursor = offset + 6;
+  var cursor = offset + 7;
   if (cursor > buffer.length) return null;
-  var chunkCount = buffer.readInt16BE(buffer, offset);
+  var chunkCount = buffer.readInt16BE(offset);
-  var dataSize = buffer.readInt32BE(buffer, offset + 2);
+  var dataSize = buffer.readInt32BE(offset + 2);
+  var skyLightSent = !!buffer.readInt8(offset + 6);
 
-  var endCursor = cursor + 1 + dataSize + 12 * chunkCount;
+  var endCursor = cursor + dataSize + 12 * chunkCount;
   if (endCursor > buffer.length) return null;
 
-  var skyLightSent = !!buffer.readInt8(buffer, cursor);
-  cursor += 1;
-
   var compressedChunkDataEnd = cursor + dataSize;
   var compressedChunkData = buffer.slice(cursor, compressedChunkDataEnd);
   cursor = compressedChunkDataEnd;
@@ -100,13 +98,13 @@ function readMapChunkBulk (buffer, offset) {
   var meta = [];
   var i, chunkX, chunkZ, primaryBitMap, addBitMap;
   for (i = 0; i < chunkCount; ++i) {
-    chunkX = buffer.readInt32BE(buffer, cursor);
+    chunkX = buffer.readInt32BE(cursor);
     cursor += 4;
-    chunkZ = buffer.readInt32BE(buffer, cursor);
+    chunkZ = buffer.readInt32BE(cursor);
     cursor += 4;
-    primaryBitMap = buffer.readUInt16BE(buffer, cursor);
+    primaryBitMap = buffer.readUInt16BE(cursor);
     cursor += 2;
-    addBitMap = buffer.readUInt16BE(buffer, cursor);
+    addBitMap = buffer.readUInt16BE(cursor);
     cursor += 2;
 
     meta.push({

packets.json

@@ -135,10 +135,20 @@
   ],
   "56": [
     {
-      "name": "dummy",
+      "name": "data",
       "type": "mapChunkBulk"
     }
   ],
+  "70": [
+    {
+      "name": "reason",
+      "type": "byte"
+    },
+    {
+      "name": "gameMode",
+      "type": "byte"
+    }
+  ],
   "103": [
     {
       "name": "windowId",