let utf8decoder = new TextDecoder();
let u8arr = new Uint8Array([0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C, 0x68, 0x65, 0x6C, 0x6C]);
new Uint32Array(u8arr.buffer);
let view = new DataView(u8arr.buffer);

function read(start, _end) {
    let pos = start;
    let sum = 0;
    while (pos < _end) {
      sum += view.getUint8(pos++);
    }
  }
  
function read2(start, _end) {
    let pos = start;
    let char, i, sum=0;
    while (pos < _end) {
      char = view.getUint32(pos);
      sum += char & 0xFF;
      sum += (char >>>= 8) & 0xFF;
      sum += (char >>>= 8) & 0xFF;
      sum += (char >>>= 8) & 0xFF;
//      byte1 = char >> 24, byte2 = (char & 0x00FF0000) >> 16, byte3 = (char & 0x0000FF00) >> 8, byte4 = (char & 0x000000FF);
      pos += 4;
    }
  }