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