function decodeSequence()

in src/asn1.ts [282:312]

• 28 lines of code
• 3 McCabe index (conditional complexity)

function decodeSequence(sequence: Buffer) {
  const { tag } = decodeIdentifier(sequence[0]);
  if (tag !== Asn1Tag.Sequence) {
    throw new Asn1DecodingError(
      `Expected a sequence to decode, but got tag ${tag}`
    );
  }
  const { firstByteOffset, lastByteOffset } = decodeLengthValue(
    sequence.slice(1)
  );
  const sequenceValue = sequence.slice(
    1 + firstByteOffset,
    1 + 1 + lastByteOffset
  );
  const parts: ILV[] = [];
  let offset = 0;
  while (offset < sequenceValue.length) {
    // Silence false postive: accessing an octet in a Buffer at a particular index
    // is to be done with index operator: [index]
    // eslint-disable-next-line security/detect-object-injection
    const identifier = decodeIdentifier(sequenceValue[offset]);
    const next = decodeLengthValue(sequenceValue.slice(offset + 1));
    const value = sequenceValue.slice(
      offset + 1 + next.firstByteOffset,
      offset + 1 + next.lastByteOffset
    );
    parts.push({ identifier, length: next.length, value });
    offset += 1 + next.lastByteOffset;
  }
  return parts;
}