Function readUint64

types.go:75–98

(r io.ByteReader)

}

func readUint64(r io.ByteReader) (uint64, error) {
	b, err := r.ReadByte()
	if err != nil {
		return 0, fmt.Errorf("readUint64: ReadByte error: %w", err)
	}

	l := bits.LeadingZeros8(^b)

	var v uint64
	if l < 7 {
		v |= uint64(b&((1<<(8-l))-1)) << (8 * l)
	}

	for i := range l {
		b, err := r.ReadByte()
		if err != nil {
			return 0, fmt.Errorf("readUint64: ReadByte error: %w", err)
		}

		v |= uint64(b) << (8 * i)
	}

	return v, nil
}

// readUint64Bounded is for values that are ultimately used as the length
// argument of a slice. Fuzzing can generate lengths that will cause a panic.