Function scanGetResponseLine

memcache/memcache.go:552–591

scanGetResponseLine populates it and returns the declared size of the item. It does not read the bytes of the item.

(line []byte, it *Item)

// scanGetResponseLine populates it and returns the declared size of the item.
// It does not read the bytes of the item.
func scanGetResponseLine(line []byte, it *Item) (size int, err error) {
	errf := func(line []byte) (int, error) {
		return -1, fmt.Errorf("memcache: unexpected line in get response: %q", line)
	}
	if !bytes.HasPrefix(line, []byte("VALUE ")) || !bytes.HasSuffix(line, []byte("\r\n")) {
		return errf(line)
	}
	s := string(line[6 : len(line)-2])
	var rest string
	var found bool
	it.Key, rest, found = cut(s, ' ')
	if !found {
		return errf(line)
	}
	val, rest, found := cut(rest, ' ')
	if !found {
		return errf(line)
	}
	flags64, err := strconv.ParseUint(val, 10, 32)
	if err != nil {
		return errf(line)
	}
	it.Flags = uint32(flags64)
	val, rest, found = cut(rest, ' ')
	size64, err := strconv.ParseUint(val, 10, 32)
	if err != nil {
		return errf(line)
	}
	if size64 > math.MaxInt { // Can happen if int is 32-bit
		return errf(line)
	}
	if !found { // final CAS ID is optional.
		return int(size64), nil
	}
	it.CasID, err = strconv.ParseUint(rest, 10, 64)
	if err != nil {
		return errf(line)
	}
	return int(size64), nil
}

// Similar to strings.Cut in Go 1.18, but sep can only be 1 byte.
func cut(s string, sep byte) (before, after string, found bool) {