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xemu/ui/vnc.h
Li Qiang 6bf21f3d83 vnc: fix memory leak when vnc disconnect 
Currently when qemu receives a vnc connect, it creates a 'VncState' to
represent this connection. In 'vnc_worker_thread_loop' it creates a
local 'VncState'. The connection 'VcnState' and local 'VncState' exchange
data in 'vnc_async_encoding_start' and 'vnc_async_encoding_end'.
In 'zrle_compress_data' it calls 'deflateInit2' to allocate the libz library
opaque data. The 'VncState' used in 'zrle_compress_data' is the local
'VncState'. In 'vnc_zrle_clear' it calls 'deflateEnd' to free the libz
library opaque data. The 'VncState' used in 'vnc_zrle_clear' is the connection
'VncState'. In currently implementation there will be a memory leak when the
vnc disconnect. Following is the asan output backtrack:

Direct leak of 29760 byte(s) in 5 object(s) allocated from:
    0 0xffffa67ef3c3 in __interceptor_calloc (/lib64/libasan.so.4+0xd33c3)
    1 0xffffa65071cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
    2 0xffffa5e968f7 in deflateInit2_ (/lib64/libz.so.1+0x78f7)
    3 0xaaaacec58613 in zrle_compress_data ui/vnc-enc-zrle.c:87
    4 0xaaaacec58613 in zrle_send_framebuffer_update ui/vnc-enc-zrle.c:344
    5 0xaaaacec34e77 in vnc_send_framebuffer_update ui/vnc.c:919
    6 0xaaaacec5e023 in vnc_worker_thread_loop ui/vnc-jobs.c:271
    7 0xaaaacec5e5e7 in vnc_worker_thread ui/vnc-jobs.c:340
    8 0xaaaacee4d3c3 in qemu_thread_start util/qemu-thread-posix.c:502
    9 0xffffa544e8bb in start_thread (/lib64/libpthread.so.0+0x78bb)
    10 0xffffa53965cb in thread_start (/lib64/libc.so.6+0xd55cb)

This is because the opaque allocated in 'deflateInit2' is not freed in
'deflateEnd'. The reason is that the 'deflateEnd' calls 'deflateStateCheck'
and in the latter will check whether 's->strm != strm'(libz's data structure).
This check will be true so in 'deflateEnd' it just return 'Z_STREAM_ERROR' and
not free the data allocated in 'deflateInit2'.

The reason this happens is that the 'VncState' contains the whole 'VncZrle',
so when calling 'deflateInit2', the 's->strm' will be the local address.
So 's->strm != strm' will be true.

To fix this issue, we need to make 'zrle' of 'VncState' to be a pointer.
Then the connection 'VncState' and local 'VncState' exchange mechanism will
work as expection. The 'tight' of 'VncState' has the same issue, let's also turn
it to a pointer.

Reported-by: Ying Fang <fangying1@huawei.com>
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-id: 20190831153922.121308-1-liq3ea@163.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-09-17 13:45:10 +02:00

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/*
* QEMU VNC display driver
*
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
* Copyright (C) 2006 Fabrice Bellard
* Copyright (C) 2009 Red Hat, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef QEMU_VNC_H
#define QEMU_VNC_H
#include "qemu/queue.h"
#include "qemu/thread.h"
#include "ui/console.h"
#include "audio/audio.h"
#include "qemu/bitmap.h"
#include "crypto/tlssession.h"
#include "qemu/buffer.h"
#include "io/channel-socket.h"
#include "io/channel-tls.h"
#include "io/net-listener.h"
#include "authz/base.h"
#include <zlib.h>
#include "keymaps.h"
#include "vnc-palette.h"
#include "vnc-enc-zrle.h"
#include "ui/kbd-state.h"
// #define _VNC_DEBUG 1
#ifdef _VNC_DEBUG
#define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define VNC_DEBUG(fmt, ...) do { } while (0)
#endif
/*****************************************************************************
*
* Core data structures
*
*****************************************************************************/
typedef struct VncState VncState;
typedef struct VncJob VncJob;
typedef struct VncRect VncRect;
typedef struct VncRectEntry VncRectEntry;
typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
typedef void VncWritePixels(VncState *vs, void *data, int size);
typedef void VncSendHextileTile(VncState *vs,
int x, int y, int w, int h,
void *last_bg,
void *last_fg,
int *has_bg, int *has_fg);
/* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
* by one bit in the dirty bitmap, should be a power of 2 */
#define VNC_DIRTY_PIXELS_PER_BIT 16
/* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
#define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
#define VNC_MAX_HEIGHT 2048
/* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
/* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
* VNC_DIRTY_BITS due to alignment */
#define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
#define VNC_STAT_RECT 64
#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
#define VNC_AUTH_CHALLENGE_SIZE 16
typedef struct VncDisplay VncDisplay;
#include "vnc-auth-vencrypt.h"
#ifdef CONFIG_VNC_SASL
#include "vnc-auth-sasl.h"
#endif
#include "vnc-ws.h"
struct VncRectStat
{
/* time of last 10 updates, to find update frequency */
struct timeval times[10];
int idx;
double freq; /* Update frequency (in Hz) */
bool updated; /* Already updated during this refresh */
};
typedef struct VncRectStat VncRectStat;
struct VncSurface
{
struct timeval last_freq_check;
DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT],
VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT);
VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
pixman_image_t *fb;
pixman_format_code_t format;
};
typedef enum VncShareMode {
VNC_SHARE_MODE_CONNECTING = 1,
VNC_SHARE_MODE_SHARED,
VNC_SHARE_MODE_EXCLUSIVE,
VNC_SHARE_MODE_DISCONNECTED,
} VncShareMode;
typedef enum VncSharePolicy {
VNC_SHARE_POLICY_IGNORE = 1,
VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
VNC_SHARE_POLICY_FORCE_SHARED,
} VncSharePolicy;
struct VncDisplay
{
QTAILQ_HEAD(, VncState) clients;
int num_connecting;
int num_shared;
int num_exclusive;
int connections_limit;
VncSharePolicy share_policy;
QIONetListener *listener;
QIONetListener *wslistener;
DisplaySurface *ds;
DisplayChangeListener dcl;
kbd_layout_t *kbd_layout;
int lock_key_sync;
QEMUPutLEDEntry *led;
int ledstate;
QKbdState *kbd;
QemuMutex mutex;
QEMUCursor *cursor;
int cursor_msize;
uint8_t *cursor_mask;
struct VncSurface guest; /* guest visible surface (aka ds->surface) */
pixman_image_t *server; /* vnc server surface */
const char *id;
QTAILQ_ENTRY(VncDisplay) next;
bool is_unix;
char *password;
time_t expires;
int auth;
int subauth; /* Used by VeNCrypt */
int ws_auth; /* Used by websockets */
int ws_subauth; /* Used by websockets */
bool lossy;
bool non_adaptive;
QCryptoTLSCreds *tlscreds;
QAuthZ *tlsauthz;
char *tlsauthzid;
#ifdef CONFIG_VNC_SASL
VncDisplaySASL sasl;
#endif
AudioState *audio_state;
};
typedef struct VncTight {
int type;
uint8_t quality;
uint8_t compression;
uint8_t pixel24;
Buffer tight;
Buffer tmp;
Buffer zlib;
Buffer gradient;
#ifdef CONFIG_VNC_JPEG
Buffer jpeg;
#endif
#ifdef CONFIG_VNC_PNG
Buffer png;
#endif
int levels[4];
z_stream stream[4];
} VncTight;
typedef struct VncHextile {
VncSendHextileTile *send_tile;
} VncHextile;
typedef struct VncZlib {
Buffer zlib;
Buffer tmp;
z_stream stream;
int level;
} VncZlib;
typedef struct VncZrle {
int type;
Buffer fb;
Buffer zrle;
Buffer tmp;
Buffer zlib;
z_stream stream;
VncPalette palette;
} VncZrle;
typedef struct VncZywrle {
int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
} VncZywrle;
struct VncRect
{
int x;
int y;
int w;
int h;
};
struct VncRectEntry
{
struct VncRect rect;
QLIST_ENTRY(VncRectEntry) next;
};
struct VncJob
{
VncState *vs;
QLIST_HEAD(, VncRectEntry) rectangles;
QTAILQ_ENTRY(VncJob) next;
};
typedef enum {
VNC_STATE_UPDATE_NONE,
VNC_STATE_UPDATE_INCREMENTAL,
VNC_STATE_UPDATE_FORCE,
} VncStateUpdate;
#define VNC_MAGIC ((uint64_t)0x05b3f069b3d204bb)
struct VncState
{
uint64_t magic;
QIOChannelSocket *sioc; /* The underlying socket */
QIOChannel *ioc; /* The channel currently used for I/O */
guint ioc_tag;
gboolean disconnecting;
DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
* vnc-jobs-async.c */
VncDisplay *vd;
VncStateUpdate update; /* Most recent pending request from client */
VncStateUpdate job_update; /* Currently processed by job thread */
int has_dirty;
uint32_t features;
int absolute;
int last_x;
int last_y;
uint32_t last_bmask;
size_t client_width; /* limited to u16 by RFB proto */
size_t client_height; /* limited to u16 by RFB proto */
VncShareMode share_mode;
uint32_t vnc_encoding;
int major;
int minor;
int auth;
int subauth; /* Used by VeNCrypt */
char challenge[VNC_AUTH_CHALLENGE_SIZE];
QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
#ifdef CONFIG_VNC_SASL
VncStateSASL sasl;
#endif
bool encode_ws;
bool websocket;
#ifdef CONFIG_VNC
VncClientInfo *info;
#endif
/* Job thread bottom half has put data for a forced update
* into the output buffer. This offset points to the end of
* the update data in the output buffer. This lets us determine
* when a force update is fully sent to the client, allowing
* us to process further forced updates. */
size_t force_update_offset;
/* We allow multiple incremental updates or audio capture
* samples to be queued in output buffer, provided the
* buffer size doesn't exceed this threshold. The value
* is calculating dynamically based on framebuffer size
* and audio sample settings in vnc_update_throttle_offset() */
size_t throttle_output_offset;
Buffer output;
Buffer input;
/* current output mode information */
VncWritePixels *write_pixels;
PixelFormat client_pf;
pixman_format_code_t client_format;
bool client_be;
CaptureVoiceOut *audio_cap;
struct audsettings as;
VncReadEvent *read_handler;
size_t read_handler_expect;
bool abort;
QemuMutex output_mutex;
QEMUBH *bh;
Buffer jobs_buffer;
/* Encoding specific, if you add something here, don't forget to
* update vnc_async_encoding_start()
*/
VncTight *tight;
VncZlib zlib;
VncHextile hextile;
VncZrle *zrle;
VncZywrle zywrle;
Notifier mouse_mode_notifier;
QTAILQ_ENTRY(VncState) next;
};
/*****************************************************************************
*
* Authentication modes
*
*****************************************************************************/
enum {
VNC_AUTH_INVALID = 0,
VNC_AUTH_NONE = 1,
VNC_AUTH_VNC = 2,
VNC_AUTH_RA2 = 5,
VNC_AUTH_RA2NE = 6,
VNC_AUTH_TIGHT = 16,
VNC_AUTH_ULTRA = 17,
VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */
VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */
};
enum {
VNC_AUTH_VENCRYPT_PLAIN = 256,
VNC_AUTH_VENCRYPT_TLSNONE = 257,
VNC_AUTH_VENCRYPT_TLSVNC = 258,
VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
VNC_AUTH_VENCRYPT_X509NONE = 260,
VNC_AUTH_VENCRYPT_X509VNC = 261,
VNC_AUTH_VENCRYPT_X509PLAIN = 262,
VNC_AUTH_VENCRYPT_X509SASL = 263,
VNC_AUTH_VENCRYPT_TLSSASL = 264,
};
/*****************************************************************************
*
* Encoding types
*
*****************************************************************************/
#define VNC_ENCODING_RAW 0x00000000
#define VNC_ENCODING_COPYRECT 0x00000001
#define VNC_ENCODING_RRE 0x00000002
#define VNC_ENCODING_CORRE 0x00000004
#define VNC_ENCODING_HEXTILE 0x00000005
#define VNC_ENCODING_ZLIB 0x00000006
#define VNC_ENCODING_TIGHT 0x00000007
#define VNC_ENCODING_ZLIBHEX 0x00000008
#define VNC_ENCODING_TRLE 0x0000000f
#define VNC_ENCODING_ZRLE 0x00000010
#define VNC_ENCODING_ZYWRLE 0x00000011
#define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */
#define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */
#define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */
#define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */
#define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */
#define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */
#define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */
#define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */
#define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */
#define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */
#define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */
#define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */
#define VNC_ENCODING_WMVi 0x574D5669
/*****************************************************************************
*
* Other tight constants
*
*****************************************************************************/
/*
* Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
*/
#define VNC_TIGHT_CCB_RESET_MASK (0x0f)
#define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4)
#define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4)
#define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4)
#define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4)
#define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4)
#define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4)
#define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
/*****************************************************************************
*
* Features
*
*****************************************************************************/
#define VNC_FEATURE_RESIZE 0
#define VNC_FEATURE_HEXTILE 1
#define VNC_FEATURE_POINTER_TYPE_CHANGE 2
#define VNC_FEATURE_WMVI 3
#define VNC_FEATURE_TIGHT 4
#define VNC_FEATURE_ZLIB 5
#define VNC_FEATURE_COPYRECT 6
#define VNC_FEATURE_RICH_CURSOR 7
#define VNC_FEATURE_TIGHT_PNG 8
#define VNC_FEATURE_ZRLE 9
#define VNC_FEATURE_ZYWRLE 10
#define VNC_FEATURE_LED_STATE 11
#define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE)
#define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE)
#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
#define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI)
#define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT)
#define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB)
#define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT)
#define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR)
#define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG)
#define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE)
#define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE)
#define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE)
/* Client -> Server message IDs */
#define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0
#define VNC_MSG_CLIENT_SET_ENCODINGS 2
#define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
#define VNC_MSG_CLIENT_KEY_EVENT 4
#define VNC_MSG_CLIENT_POINTER_EVENT 5
#define VNC_MSG_CLIENT_CUT_TEXT 6
#define VNC_MSG_CLIENT_VMWARE_0 127
#define VNC_MSG_CLIENT_CALL_CONTROL 249
#define VNC_MSG_CLIENT_XVP 250
#define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251
#define VNC_MSG_CLIENT_TIGHT 252
#define VNC_MSG_CLIENT_GII 253
#define VNC_MSG_CLIENT_VMWARE_1 254
#define VNC_MSG_CLIENT_QEMU 255
/* Server -> Client message IDs */
#define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0
#define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1
#define VNC_MSG_SERVER_BELL 2
#define VNC_MSG_SERVER_CUT_TEXT 3
#define VNC_MSG_SERVER_VMWARE_0 127
#define VNC_MSG_SERVER_CALL_CONTROL 249
#define VNC_MSG_SERVER_XVP 250
#define VNC_MSG_SERVER_TIGHT 252
#define VNC_MSG_SERVER_GII 253
#define VNC_MSG_SERVER_VMWARE_1 254
#define VNC_MSG_SERVER_QEMU 255
/* QEMU client -> server message IDs */
#define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0
#define VNC_MSG_CLIENT_QEMU_AUDIO 1
/* QEMU server -> client message IDs */
#define VNC_MSG_SERVER_QEMU_AUDIO 1
/* QEMU client -> server audio message IDs */
#define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0
#define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1
#define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2
/* QEMU server -> client audio message IDs */
#define VNC_MSG_SERVER_QEMU_AUDIO_END 0
#define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1
#define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2
/*****************************************************************************
*
* Internal APIs
*
*****************************************************************************/
/* Event loop functions */
gboolean vnc_client_io(QIOChannel *ioc,
GIOCondition condition,
void *opaque);
size_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
size_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
/* Protocol I/O functions */
void vnc_write(VncState *vs, const void *data, size_t len);
void vnc_write_u32(VncState *vs, uint32_t value);
void vnc_write_s32(VncState *vs, int32_t value);
void vnc_write_u16(VncState *vs, uint16_t value);
void vnc_write_u8(VncState *vs, uint8_t value);
void vnc_flush(VncState *vs);
void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
void vnc_disconnect_finish(VncState *vs);
void vnc_start_protocol(VncState *vs);
/* Buffer I/O functions */
uint32_t read_u32(uint8_t *data, size_t offset);
/* Protocol stage functions */
void vnc_client_error(VncState *vs);
size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp);
void start_client_init(VncState *vs);
void start_auth_vnc(VncState *vs);
/* Misc helpers */
static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
return (vs->features & (1 << feature));
}
/* Framebuffer */
void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
int32_t encoding);
/* server fb is in PIXMAN_x8r8g8b8 */
#define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
#define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
#define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8)
void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
int vnc_server_fb_stride(VncDisplay *vd);
void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
/* Encodings */
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
int y, int w, int h);
void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
void vnc_zlib_zfree(void *x, void *addr);
int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
void vnc_zlib_clear(VncState *vs);
int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
int w, int h);
void vnc_tight_clear(VncState *vs);
int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
void vnc_zrle_clear(VncState *vs);
#endif /* QEMU_VNC_H */
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