Function decode

encoding/_common16.ts:46–66

(
  buffer: Uint8Array_,
  i: number,
  o: number,
  alphabet: Uint8Array,
)

}

export function decode(
  buffer: Uint8Array_,
  i: number,
  o: number,
  alphabet: Uint8Array,
): number {
  if ((buffer.length - o) % 2 === 1) {
    throw new RangeError(
      `Cannot decode input as hex: Length (${
        buffer.length - o
      }) must be divisible by 2`,
    );
  }

  i += 1;
  for (; i < buffer.length; i += 2) {
    buffer[o++] = (getByte(buffer[i - 1]!, alphabet) << 4) |
      getByte(buffer[i]!, alphabet);
  }
  return o;
}

function getByte(char: number, alphabet: Uint8Array): number {
  const byte = alphabet[char] ?? 16;