ui/vnc: fix potential memory corruption issues
[qemu.git] / ui / vnc.h
1 /*
2 * QEMU VNC display driver
3 *
4 * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
5 * Copyright (C) 2006 Fabrice Bellard
6 * Copyright (C) 2009 Red Hat, Inc
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #ifndef __QEMU_VNC_H
28 #define __QEMU_VNC_H
29
30 #include "qemu-common.h"
31 #include "qemu/queue.h"
32 #include "qemu/thread.h"
33 #include "ui/console.h"
34 #include "audio/audio.h"
35 #include "qemu/bitmap.h"
36 #include <zlib.h>
37 #include <stdbool.h>
38
39 #include "keymaps.h"
40 #include "vnc-palette.h"
41 #include "vnc-enc-zrle.h"
42 #include "qapi-types.h"
43
44 // #define _VNC_DEBUG 1
45
46 #ifdef _VNC_DEBUG
47 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
48 #else
49 #define VNC_DEBUG(fmt, ...) do { } while (0)
50 #endif
51
52 /*****************************************************************************
53 *
54 * Core data structures
55 *
56 *****************************************************************************/
57
58 typedef struct Buffer
59 {
60 size_t capacity;
61 size_t offset;
62 uint8_t *buffer;
63 } Buffer;
64
65 typedef struct VncState VncState;
66 typedef struct VncJob VncJob;
67 typedef struct VncRect VncRect;
68 typedef struct VncRectEntry VncRectEntry;
69
70 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
71
72 typedef void VncWritePixels(VncState *vs, void *data, int size);
73
74 typedef void VncSendHextileTile(VncState *vs,
75 int x, int y, int w, int h,
76 void *last_bg,
77 void *last_fg,
78 int *has_bg, int *has_fg);
79
80 /* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
81 * by one bit in the dirty bitmap, should be a power of 2 */
82 #define VNC_DIRTY_PIXELS_PER_BIT 16
83
84 /* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
85
86 #define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
87 #define VNC_MAX_HEIGHT 2048
88
89 /* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
90 #define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
91
92 /* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
93 * VNC_DIRTY_BITS due to alignment */
94 #define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
95
96 #define VNC_STAT_RECT 64
97 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
98 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
99
100 #define VNC_AUTH_CHALLENGE_SIZE 16
101
102 typedef struct VncDisplay VncDisplay;
103
104 #ifdef CONFIG_VNC_TLS
105 #include "vnc-tls.h"
106 #include "vnc-auth-vencrypt.h"
107 #endif
108 #ifdef CONFIG_VNC_SASL
109 #include "vnc-auth-sasl.h"
110 #endif
111 #ifdef CONFIG_VNC_WS
112 #include "vnc-ws.h"
113 #endif
114
115 struct VncRectStat
116 {
117 /* time of last 10 updates, to find update frequency */
118 struct timeval times[10];
119 int idx;
120
121 double freq; /* Update frequency (in Hz) */
122 bool updated; /* Already updated during this refresh */
123 };
124
125 typedef struct VncRectStat VncRectStat;
126
127 struct VncSurface
128 {
129 struct timeval last_freq_check;
130 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT],
131 VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT);
132 VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
133 pixman_image_t *fb;
134 pixman_format_code_t format;
135 };
136
137 typedef enum VncShareMode {
138 VNC_SHARE_MODE_CONNECTING = 1,
139 VNC_SHARE_MODE_SHARED,
140 VNC_SHARE_MODE_EXCLUSIVE,
141 VNC_SHARE_MODE_DISCONNECTED,
142 } VncShareMode;
143
144 typedef enum VncSharePolicy {
145 VNC_SHARE_POLICY_IGNORE = 1,
146 VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
147 VNC_SHARE_POLICY_FORCE_SHARED,
148 } VncSharePolicy;
149
150 struct VncDisplay
151 {
152 QTAILQ_HEAD(, VncState) clients;
153 int num_exclusive;
154 VncSharePolicy share_policy;
155 int lsock;
156 #ifdef CONFIG_VNC_WS
157 int lwebsock;
158 bool websocket;
159 char *ws_display;
160 #endif
161 DisplaySurface *ds;
162 DisplayChangeListener dcl;
163 kbd_layout_t *kbd_layout;
164 int lock_key_sync;
165 QemuMutex mutex;
166
167 QEMUCursor *cursor;
168 int cursor_msize;
169 uint8_t *cursor_mask;
170
171 struct VncSurface guest; /* guest visible surface (aka ds->surface) */
172 pixman_image_t *server; /* vnc server surface */
173
174 char *display;
175 char *password;
176 time_t expires;
177 int auth;
178 bool lossy;
179 bool non_adaptive;
180 #ifdef CONFIG_VNC_TLS
181 int subauth; /* Used by VeNCrypt */
182 VncDisplayTLS tls;
183 #endif
184 #ifdef CONFIG_VNC_SASL
185 VncDisplaySASL sasl;
186 #endif
187 };
188
189 typedef struct VncTight {
190 int type;
191 uint8_t quality;
192 uint8_t compression;
193 uint8_t pixel24;
194 Buffer tight;
195 Buffer tmp;
196 Buffer zlib;
197 Buffer gradient;
198 #ifdef CONFIG_VNC_JPEG
199 Buffer jpeg;
200 #endif
201 #ifdef CONFIG_VNC_PNG
202 Buffer png;
203 #endif
204 int levels[4];
205 z_stream stream[4];
206 } VncTight;
207
208 typedef struct VncHextile {
209 VncSendHextileTile *send_tile;
210 } VncHextile;
211
212 typedef struct VncZlib {
213 Buffer zlib;
214 Buffer tmp;
215 z_stream stream;
216 int level;
217 } VncZlib;
218
219 typedef struct VncZrle {
220 int type;
221 Buffer fb;
222 Buffer zrle;
223 Buffer tmp;
224 Buffer zlib;
225 z_stream stream;
226 VncPalette palette;
227 } VncZrle;
228
229 typedef struct VncZywrle {
230 int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
231 } VncZywrle;
232
233 struct VncRect
234 {
235 int x;
236 int y;
237 int w;
238 int h;
239 };
240
241 struct VncRectEntry
242 {
243 struct VncRect rect;
244 QLIST_ENTRY(VncRectEntry) next;
245 };
246
247 struct VncJob
248 {
249 VncState *vs;
250
251 QLIST_HEAD(, VncRectEntry) rectangles;
252 QTAILQ_ENTRY(VncJob) next;
253 };
254
255 struct VncState
256 {
257 int csock;
258
259 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
260 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
261 * vnc-jobs-async.c */
262
263 VncDisplay *vd;
264 int need_update;
265 int force_update;
266 uint32_t features;
267 int absolute;
268 int last_x;
269 int last_y;
270 uint32_t last_bmask;
271 int client_width;
272 int client_height;
273 VncShareMode share_mode;
274
275 uint32_t vnc_encoding;
276
277 int major;
278 int minor;
279
280 int auth;
281 char challenge[VNC_AUTH_CHALLENGE_SIZE];
282 #ifdef CONFIG_VNC_TLS
283 int subauth; /* Used by VeNCrypt */
284 VncStateTLS tls;
285 #endif
286 #ifdef CONFIG_VNC_SASL
287 VncStateSASL sasl;
288 #endif
289 #ifdef CONFIG_VNC_WS
290 #ifdef CONFIG_VNC_TLS
291 VncStateTLS ws_tls;
292 #endif /* CONFIG_VNC_TLS */
293 bool encode_ws;
294 bool websocket;
295 #endif /* CONFIG_VNC_WS */
296
297 VncClientInfo *info;
298
299 Buffer output;
300 Buffer input;
301 #ifdef CONFIG_VNC_WS
302 Buffer ws_input;
303 Buffer ws_output;
304 #endif
305 /* current output mode information */
306 VncWritePixels *write_pixels;
307 PixelFormat client_pf;
308 pixman_format_code_t client_format;
309 bool client_be;
310
311 CaptureVoiceOut *audio_cap;
312 struct audsettings as;
313
314 VncReadEvent *read_handler;
315 size_t read_handler_expect;
316 /* input */
317 uint8_t modifiers_state[256];
318 QEMUPutLEDEntry *led;
319
320 bool abort;
321 bool initialized;
322 QemuMutex output_mutex;
323 QEMUBH *bh;
324 Buffer jobs_buffer;
325
326 /* Encoding specific, if you add something here, don't forget to
327 * update vnc_async_encoding_start()
328 */
329 VncTight tight;
330 VncZlib zlib;
331 VncHextile hextile;
332 VncZrle zrle;
333 VncZywrle zywrle;
334
335 Notifier mouse_mode_notifier;
336
337 QTAILQ_ENTRY(VncState) next;
338 };
339
340
341 /*****************************************************************************
342 *
343 * Authentication modes
344 *
345 *****************************************************************************/
346
347 enum {
348 VNC_AUTH_INVALID = 0,
349 VNC_AUTH_NONE = 1,
350 VNC_AUTH_VNC = 2,
351 VNC_AUTH_RA2 = 5,
352 VNC_AUTH_RA2NE = 6,
353 VNC_AUTH_TIGHT = 16,
354 VNC_AUTH_ULTRA = 17,
355 VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */
356 VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
357 VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */
358 };
359
360 enum {
361 VNC_AUTH_VENCRYPT_PLAIN = 256,
362 VNC_AUTH_VENCRYPT_TLSNONE = 257,
363 VNC_AUTH_VENCRYPT_TLSVNC = 258,
364 VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
365 VNC_AUTH_VENCRYPT_X509NONE = 260,
366 VNC_AUTH_VENCRYPT_X509VNC = 261,
367 VNC_AUTH_VENCRYPT_X509PLAIN = 262,
368 VNC_AUTH_VENCRYPT_X509SASL = 263,
369 VNC_AUTH_VENCRYPT_TLSSASL = 264,
370 };
371
372
373 /*****************************************************************************
374 *
375 * Encoding types
376 *
377 *****************************************************************************/
378
379 #define VNC_ENCODING_RAW 0x00000000
380 #define VNC_ENCODING_COPYRECT 0x00000001
381 #define VNC_ENCODING_RRE 0x00000002
382 #define VNC_ENCODING_CORRE 0x00000004
383 #define VNC_ENCODING_HEXTILE 0x00000005
384 #define VNC_ENCODING_ZLIB 0x00000006
385 #define VNC_ENCODING_TIGHT 0x00000007
386 #define VNC_ENCODING_ZLIBHEX 0x00000008
387 #define VNC_ENCODING_TRLE 0x0000000f
388 #define VNC_ENCODING_ZRLE 0x00000010
389 #define VNC_ENCODING_ZYWRLE 0x00000011
390 #define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */
391 #define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */
392 #define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */
393 #define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */
394 #define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */
395 #define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */
396 #define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */
397 #define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */
398 #define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */
399 #define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */
400 #define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */
401 #define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */
402 #define VNC_ENCODING_WMVi 0x574D5669
403
404 /*****************************************************************************
405 *
406 * Other tight constants
407 *
408 *****************************************************************************/
409
410 /*
411 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
412 */
413
414 #define VNC_TIGHT_CCB_RESET_MASK (0x0f)
415 #define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4)
416 #define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4)
417 #define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4)
418 #define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4)
419 #define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4)
420 #define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4)
421 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
422
423 /*****************************************************************************
424 *
425 * Features
426 *
427 *****************************************************************************/
428
429 #define VNC_FEATURE_RESIZE 0
430 #define VNC_FEATURE_HEXTILE 1
431 #define VNC_FEATURE_POINTER_TYPE_CHANGE 2
432 #define VNC_FEATURE_WMVI 3
433 #define VNC_FEATURE_TIGHT 4
434 #define VNC_FEATURE_ZLIB 5
435 #define VNC_FEATURE_COPYRECT 6
436 #define VNC_FEATURE_RICH_CURSOR 7
437 #define VNC_FEATURE_TIGHT_PNG 8
438 #define VNC_FEATURE_ZRLE 9
439 #define VNC_FEATURE_ZYWRLE 10
440 #define VNC_FEATURE_LED_STATE 11
441
442 #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE)
443 #define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE)
444 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
445 #define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI)
446 #define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT)
447 #define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB)
448 #define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT)
449 #define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR)
450 #define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG)
451 #define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE)
452 #define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE)
453 #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE)
454
455
456 /* Client -> Server message IDs */
457 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0
458 #define VNC_MSG_CLIENT_SET_ENCODINGS 2
459 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
460 #define VNC_MSG_CLIENT_KEY_EVENT 4
461 #define VNC_MSG_CLIENT_POINTER_EVENT 5
462 #define VNC_MSG_CLIENT_CUT_TEXT 6
463 #define VNC_MSG_CLIENT_VMWARE_0 127
464 #define VNC_MSG_CLIENT_CALL_CONTROL 249
465 #define VNC_MSG_CLIENT_XVP 250
466 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251
467 #define VNC_MSG_CLIENT_TIGHT 252
468 #define VNC_MSG_CLIENT_GII 253
469 #define VNC_MSG_CLIENT_VMWARE_1 254
470 #define VNC_MSG_CLIENT_QEMU 255
471
472 /* Server -> Client message IDs */
473 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0
474 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1
475 #define VNC_MSG_SERVER_BELL 2
476 #define VNC_MSG_SERVER_CUT_TEXT 3
477 #define VNC_MSG_SERVER_VMWARE_0 127
478 #define VNC_MSG_SERVER_CALL_CONTROL 249
479 #define VNC_MSG_SERVER_XVP 250
480 #define VNC_MSG_SERVER_TIGHT 252
481 #define VNC_MSG_SERVER_GII 253
482 #define VNC_MSG_SERVER_VMWARE_1 254
483 #define VNC_MSG_SERVER_QEMU 255
484
485
486
487 /* QEMU client -> server message IDs */
488 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0
489 #define VNC_MSG_CLIENT_QEMU_AUDIO 1
490
491 /* QEMU server -> client message IDs */
492 #define VNC_MSG_SERVER_QEMU_AUDIO 1
493
494
495
496 /* QEMU client -> server audio message IDs */
497 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0
498 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1
499 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2
500
501 /* QEMU server -> client audio message IDs */
502 #define VNC_MSG_SERVER_QEMU_AUDIO_END 0
503 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1
504 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2
505
506
507 /*****************************************************************************
508 *
509 * Internal APIs
510 *
511 *****************************************************************************/
512
513 /* Event loop functions */
514 void vnc_client_read(void *opaque);
515 void vnc_client_write(void *opaque);
516
517 long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
518 long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
519
520 /* Protocol I/O functions */
521 void vnc_write(VncState *vs, const void *data, size_t len);
522 void vnc_write_u32(VncState *vs, uint32_t value);
523 void vnc_write_s32(VncState *vs, int32_t value);
524 void vnc_write_u16(VncState *vs, uint16_t value);
525 void vnc_write_u8(VncState *vs, uint8_t value);
526 void vnc_flush(VncState *vs);
527 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
528 void vnc_disconnect_finish(VncState *vs);
529 void vnc_init_state(VncState *vs);
530
531
532 /* Buffer I/O functions */
533 uint32_t read_u32(uint8_t *data, size_t offset);
534
535 /* Protocol stage functions */
536 void vnc_client_error(VncState *vs);
537 int vnc_client_io_error(VncState *vs, int ret, int last_errno);
538
539 void start_client_init(VncState *vs);
540 void start_auth_vnc(VncState *vs);
541
542 /* Buffer management */
543 void buffer_reserve(Buffer *buffer, size_t len);
544 void buffer_reset(Buffer *buffer);
545 void buffer_free(Buffer *buffer);
546 void buffer_append(Buffer *buffer, const void *data, size_t len);
547 void buffer_advance(Buffer *buf, size_t len);
548 uint8_t *buffer_end(Buffer *buffer);
549
550
551 /* Misc helpers */
552
553 char *vnc_socket_local_addr(const char *format, int fd);
554 char *vnc_socket_remote_addr(const char *format, int fd);
555
556 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
557 return (vs->features & (1 << feature));
558 }
559
560 /* Framebuffer */
561 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
562 int32_t encoding);
563
564 /* server fb is in PIXMAN_x8r8g8b8 */
565 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
566 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
567 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8)
568
569 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
570 int vnc_server_fb_stride(VncDisplay *vd);
571
572 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
573 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
574 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
575
576 /* Encodings */
577 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
578
579 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
580
581 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
582 int y, int w, int h);
583 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
584
585 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
586 void vnc_zlib_zfree(void *x, void *addr);
587 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
588 void vnc_zlib_clear(VncState *vs);
589
590 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
591 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
592 int w, int h);
593 void vnc_tight_clear(VncState *vs);
594
595 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
596 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
597 void vnc_zrle_clear(VncState *vs);
598
599 #endif /* __QEMU_VNC_H */