number method

int number([ int bitLength = 64, Endian endian = Endian.big ])

Gets an unsigned integer of bitLength-bit from the message digest.

If endian is Endian.little, it will treat the digest bytes as a little endian number; Otherwise, if endian is Endian.big, it will treat the digest bytes as a big endian number.

On the web, an int is a 64-bit floating point number, so results above 2^53 cannot be represented exactly. Keep bitLength at 53 or below for exact values on that platform.

Implementation

int number([int bitLength = 64, Endian endian = Endian.big]) {
  if (bitLength < 8 || bitLength > 64 || (bitLength & 7) > 0) {
    throw ArgumentError(
      'Invalid bit length. '
      'It must be a number between 8 to 64 and a multiple of 8.',
    );
  } else {
    bitLength >>>= 3;
  }
  // Accumulate with `* 256 +` rather than `<< 8 |` to support the web
  int result = 0;
  int n = bytes.length;
  if (endian == Endian.little) {
    for (int i = (n > bitLength ? bitLength : n) - 1; i >= 0; i--) {
      result = result * 256 + bytes[i];
    }
  } else {
    for (int i = n > bitLength ? n - bitLength : 0; i < n; i++) {
      result = result * 256 + bytes[i];
    }
  }
  return result;
}