detect-encoding-of-buffer.js

// Detects encoding of a buffer
exports.detectEncoding = function (buffer) {
  for (var i = 0; i < buffer.length; i++) {
    if (buffer[i] === 65533 || buffer[i] <= 8) {
      // The character code 65533 is often used as a replacement character for an unknown or unprintable character in a text file.
      // The check for values less than or equal to 8 is intended to exclude control characters which are typically not part of human-readable text.
      return 'binary'
    }
  }
  return 'utf8'
}