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pos(buf.subarray(1, buf.length))\n    : pre === 0xff ? twos(buf)\n    : null\n  if (value === null) {\n    throw Error('invalid base256 encoding')\n  }\n\n  if (!Number.isSafeInteger(value)) {\n    // The number is so large that javascript cannot represent it with integer\n    // precision.\n    throw Error(\n      'parsed number outside of javascript safe integer range',\n    )\n  }\n\n  return value\n}\n\nconst twos = (buf: Buffer) => {\n  var len = buf.length\n  var sum = 0\n  var flipped = false\n  for (var i = len - 1; i > -1; i--) {\n    var byte = Number(buf[i])\n    var f\n    if (flipped) {\n      f = onesComp(byte)\n    } else if (byte === 0) {\n      f = byte\n    } else {\n      flipped = true\n      f = twosComp(byte)\n    }\n    if (f !== 0) {\n      sum -= f * Math.pow(256, len - i - 1)\n    }\n  }\n  return sum\n}\n\nconst pos = (buf: Buffer) => {\n  var len = buf.length\n  var sum = 0\n  for (var i = len - 1; i > -1; i--) {\n    var byte = Number(buf[i])\n    if (byte !== 0) {\n      sum += byte * Math.pow(256, len - i - 1)\n    }\n  }\n  return sum\n}\n\nconst onesComp = (byte: number) => (0xff ^ byte) & 0xff\n\nconst twosComp = (byte: number) => ((0xff ^ byte) + 1) & 0xff\n"]}