more packets parsed

lib/parser.js

@@ -79,8 +79,89 @@ var readers = {
   'float': readFloat,
   'slotArray': readSlotArray,
   'mapChunkBulk': readMapChunkBulk,
+  'entityMetadata': readEntityMetadata,
+  'objectData': readObjectData,
 };
 
+var entityMetadataReaders = {
+  0: readByte,
+  1: readShort,
+  2: readInt,
+  3: readFloat,
+  4: readString,
+  5: readSlot,
+  6: readVector,
+};
+
+function readVector(buffer, offset) {
+  if (offset + 12 > buffer.length) return null;
+  return {
+    value: {
+      x: buffer.readInt32BE(offset),
+      y: buffer.readInt32BE(offset + 4),
+      z: buffer.readInt32BE(offset + 8),
+    },
+    size: 12,
+  };
+}
+
+function readEntityMetadata(buffer, offset) {
+  var cursor = offset;
+  var metadata = {};
+  var item, key, type, results;
+  while (true) {
+    if (cursor + 1 > buffer.length) return null;
+    item = buffer.readUInt8(cursor);
+    cursor += 1;
+    if (item === 0x7f) break;
+    key = item & 0x1f;
+    type = item >> 5;
+    reader = entityMetadataReaders[type];
+    assert.ok(reader, "missing reader for entity metadata type " + type);
+    results = reader(buffer, cursor);
+    if (! results) return null;
+    metadata[key] = results.value;
+    cursor += results.size;
+  }
+  return {
+    value: metadata,
+    size: cursor - offset,
+  };
+}
+
+function readObjectData(buffer, offset) {
+  var cursor = offset + 4;
+  if (cursor > buffer.length) return null;
+  var intField = buffer.readInt32BE(offset);
+
+  if (intField === 0) {
+    return {
+      value: {
+        intField: intField,
+      },
+      size: cursor - offset,
+    };
+  }
+
+  if (cursor + 6 > buffer.length) return null;
+  var velocityX = buffer.readInt16BE(cursor);
+  cursor += 2;
+  var velocityY = buffer.readInt16BE(cursor);
+  cursor += 2;
+  var velocityZ = buffer.readInt16BE(cursor);
+  cursor += 2;
+
+  return {
+    value: {
+      intField: intField,
+      velocityX: velocityX,
+      velocityY: velocityY,
+      velocityZ: velocityZ,
+    },
+    size: cursor - offset,
+  };
+}
+
 function readMapChunkBulk (buffer, offset) {
   var cursor = offset + 7;
   if (cursor > buffer.length) return null;

packets.json

@@ -133,6 +133,90 @@
       "type": "short"
     }
   ],
+  "23": [
+    {
+      "name": "eid",
+      "type": "int"
+    },
+    {
+      "name": "type",
+      "type": "byte"
+    },
+    {
+      "name": "x",
+      "type": "int"
+    },
+    {
+      "name": "y",
+      "type": "int"
+    },
+    {
+      "name": "z",
+      "type": "int"
+    },
+    {
+      "name": "yaw",
+      "type": "byte"
+    },
+    {
+      "name": "pitch",
+      "type": "byte"
+    },
+    {
+      "name": "objectData",
+      "type": "objectData"
+    }
+  ],
+  "24": [
+    {
+      "name": "eid",
+      "type": "int"
+    },
+    {
+      "name": "type",
+      "type": "byte"
+    },
+    {
+      "name": "x",
+      "type": "int"
+    },
+    {
+      "name": "y",
+      "type": "int"
+    },
+    {
+      "name": "z",
+      "type": "int"
+    },
+    {
+      "name": "yaw",
+      "type": "byte"
+    },
+    {
+      "name": "pitch",
+      "type": "byte"
+    },
+    {
+      "name": "headYaw",
+      "type": "byte"
+    },
+    {
+      "name": "velocityX",
+      "type": "short"
+    },
+    {
+      "name": "velocityY",
+      "type": "short"
+    },
+    {
+      "name": "velocityZ",
+      "type": "short"
+    },
+    {
+      "name": "metadata",
+      "type": "entityMetadata"
+    }
+  ],
   "56": [
     {
       "name": "data",