Testing out binary reading and parsing in the browser

readBinary.js

fetch('binary_file1.dat').then(function(response) {
  return response.blob()
})
.then(function(blobData) {
  var reader, header, level;
  reader = new FileReader()
  reader.addEventListener('loadend', function() {
    // Each 16bit unsigned value is two bytes in size
    // By asking for 0, 3 (pos 0-3) of the result we are taking 6 bytes.
    header = new Uint16Array(reader.result, 0, 3)
    // Read rest of binary data as 8bit each and break up into 4bit after read?
    // Not Tested: levelData = new Uint8Array(reader.result, 3, reader.result.byteLength)
    console.log(header)
  })
  reader.readAsArrayBuffer(blobData)
})