code: function parseFileChunk(data){
    var chunk = {};
    chunk.chunkIdx = new Float64Array(data.buffer, 8, 1)[0];
    chunk.fileID = String.fromCharCode.apply(null, new Uint16Array(data.buffer, 32, 8));
    chunk.msgIdx = new Float64Array(data.buffer, 16, 1)[0];
    chunk.data = new Uint8Array(data.buffer, 48);
    return chunk;
  }
docs: makeFileChunk() function is built into _sendChunk(), its dataType is 3