-int vncws_decode_frame(Buffer *input, uint8_t **payload,
- size_t *payload_size, size_t *frame_size);
+int vncws_decode_frame_header(Buffer *input,
+ size_t *header_size,
+ size_t *payload_remain,
+ WsMask *payload_mask);
+int vncws_decode_frame_payload(Buffer *input,
+ size_t *payload_remain, WsMask *payload_mask,
+ uint8_t **payload, size_t *payload_size);