appendNumericBytes static method

Implementation

static void appendNumericBytes(String content, BitArray bits) {
  var length = content.length;
  var i = 0;
  while (i < length) {
    var num1 = content.codeUnitAt(i) - $0;
    if (i + 2 < length) {
      // Encode three numeric letters in ten bits.
      var num2 = content.codeUnitAt(i + 1) - $0;
      var num3 = content.codeUnitAt(i + 2) - $0;
      bits.appendBits(num1 * 100 + num2 * 10 + num3, 10);
      i += 3;
    } else if (i + 1 < length) {
      // Encode two numeric letters in seven bits.
      var num2 = content.codeUnitAt(i + 1) - $0;
      bits.appendBits(num1 * 10 + num2, 7);
      i += 2;
    } else {
      // Encode one numeric letter in four bits.
      bits.appendBits(num1, 4);
      i++;
    }
  }
}