Function unsignedIntegerDeterministic

js/sign/src/cbor/deterministic.ts:55–73

(
  input: Uint8Array,
  index: number
)

// the right amount of bytes is used in the CBOR encoding. It returns both,
// the length of the bytes array and the value of the unsigned integer.
function unsignedIntegerDeterministic(
  input: Uint8Array,
  index: number
): { lengthInBytes: number; value: bigint } {
  const info = convertToAdditionalInfo(input[index]);
  const lengthInBytes = getAdditionalInfoLength(info);
  const value = getUnsignedIntegerValue(
    input.slice(index, index + lengthInBytes + /*add info byte*/ 1),
    info
  );

  if (value < getAdditionalInfoValueLowerLimit(info)) {
    throw new Error(
      `${value} should not be represented with ${lengthInBytes} bytes in deterministic CBOR.`
    );
  }

  return { lengthInBytes, value };
}

export function getUnsignedIntegerValue(
  input: Uint8Array,