readAsBinaryString.js

/**
 * A backward-compatible for FileReader: readAsBinaryString() method
 * @param arrayBuffer {ArrayBuffer}
 * @see https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsBinaryString
 */
function readAsBinaryString (arrayBuffer) {
  const binary = []
  const arrayBufferView = new Uint8Array(arrayBuffer)
  for (let i = 0; i < arrayBufferView.length; i++) {
    binary.push(String.fromCharCode(arrayBufferView[i]))
  }
  return binary.join('')
}