decodeSigned static method

int decodeSigned(
  1. List<int> bytes, {
  2. int n = 64,
})

Decodes a LEB128 bytes of a signed integer.

  • n (optional) argument specifies the number of bits in the integer.

Implementation

static int decodeSigned(List<int> bytes, {int n = 64}) {
  var result = 0;
  var shift = 0;
  var i = 0;

  while (true) {
    var byte = bytes[i];
    result |= _platform.shiftLeftInt((byte & 0x7F), shift);
    shift += 7;

    if ((byte & 0x80) == 0) {
      break;
    }

    ++i;
  }

  if ((shift < n) && (bytes[i] & 0x40) != 0) {
    if (_platform.supportsFullBitsShift) {
      result |= _platform.shiftLeftInt(-1, shift);
    } else {
      result = (BigInt.from(result) | (BigInt.from(-1) << shift)).toInt();
    }
  }

  return result;
}