Function decodeJEntry

pkg/util/json/jentry.go:98–115

decodeJEntry decodes a 4-byte JEntry from a buffer. The current offset is required because a JEntry can either encode a length or an offset, and while a length can be interpreted locally, the current decoding offset is required in order to interpret the encoded offset.

(b []byte, offset uint32)

// a length can be interpreted locally, the current decoding offset is required
// in order to interpret the encoded offset.
func decodeJEntry(b []byte, offset uint32) ([]byte, jEntry, error) {
	b, encoded, err := encoding.DecodeUint32Ascending(b)
	if err != nil {
		return b, jEntry{}, err
	}

	length := encoded & jEntryOffLenMask

	isOff := (encoded & jEntryIsOffFlag) != 0
	if isOff {
		length -= offset
	}

	return b, jEntry{
		typCode: encoded & jEntryTypeMask,
		length:  length,
	}, nil
}