func readArrayHeader()

in internal/encoding/decode.go [375:412]

• 34 lines of code
• 8 McCabe index (conditional complexity)

func readArrayHeader(r *buffer.Buffer) (length int64, _ error) {
	type_, err := readType(r)
	if err != nil {
		return 0, err
	}

	arrayLength := r.Len()

	switch type_ {
	case TypeCodeArray8:
		buf, ok := r.Next(2)
		if !ok {
			return 0, errors.New("invalid length")
		}
		_ = buf[1]

		size := int(buf[0])
		if size > arrayLength-1 {
			return 0, errors.New("invalid length")
		}
		length = int64(buf[1])
	case TypeCodeArray32:
		buf, ok := r.Next(8)
		if !ok {
			return 0, errors.New("invalid length")
		}
		_ = buf[7]

		size := binary.BigEndian.Uint32(buf[:4])
		if int(size) > arrayLength-4 {
			return 0, fmt.Errorf("invalid length for type %02x", type_)
		}
		length = int64(binary.BigEndian.Uint32(buf[4:8]))
	default:
		return 0, fmt.Errorf("type code %#02x is not a recognized array type", type_)
	}
	return length, nil
}