File: rfbproto.c

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/*
 *  Copyright (C) 1997, 1998 Olivetti & Oracle Research Laboratory
 *
 *  This is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This software is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this software; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 *  USA.
 */

/*
 * rfbproto.c - functions to deal with client side of RFB protocol.
 */

/*
 * Changed to use macros, so that rfbproto.c is independent of the 
 * display routines. -- ganesh
 */

#include <unistd.h>
#include <errno.h>
#include <pwd.h>
#include <vncviewer.h>
#include <X11/Xatom.h>
#include <vncauth.h>
#include <vgagl.h>

static Bool HandleHextileEncoding8(int x, int y, int w, int h);
static Bool HandleHextileEncoding16(int x, int y, int w, int h);
static Bool HandleHextileEncoding32(int x, int y, int w, int h);

int rfbsock;
char *desktopName;
rfbPixelFormat myFormat;
rfbServerInitMsg si;
struct timeval updateRequestTime;
Bool sendUpdateRequest;

int endianTest = 1;


/* note that the CoRRE encoding uses this buffer and assumes it is big enough
   to hold 255 * 255 * 32 bits -> 260100 bytes.  640*480 = 307200 bytes */
/* also hextile assumes it is big enough to hold 16 * 16 * 32 bits */

#define BUFFER_SIZE (640*480)
static char buffer[BUFFER_SIZE];


static void PrintPixelFormat(rfbPixelFormat *format);


/*
 * ConnectToRFBServer.
 */

Bool
ConnectToRFBServer(const char *hostname, int port)
{
    unsigned int host;

    if (!StringToIPAddr(hostname, &host)) {
	fprintf(stderr,"%s: couldn't convert '%s' to host address\n",
		programName,hostname);
	return False;
    }

    rfbsock = ConnectToTcpAddr(host, port);

    if (rfbsock < 0) {
	fprintf(stderr,"%s: unable to connect to VNC server\n",
		programName);
	return False;
    }

    return True;
}


/*
 * InitialiseRFBConnection.
 */

Bool
InitialiseRFBConnection(int sock)
{
    rfbProtocolVersionMsg pv;
    int major,minor;
    Bool authWillWork = True;
    CARD32 authScheme, reasonLen, authResult;
    char *reason;
    CARD8 challenge[CHALLENGESIZE];
    char *passwd;
    int i;
    rfbClientInitMsg ci;

    /* if the connection is immediately closed, don't report anything, so
       that pmw's monitor can make test connections */

    if (listenSpecified)
	errorMessageFromReadExact = False;

    if (!ReadExact(sock, pv, sz_rfbProtocolVersionMsg)) return False;

    errorMessageFromReadExact = True;

    pv[sz_rfbProtocolVersionMsg] = 0;

    if (sscanf(pv,rfbProtocolVersionFormat,&major,&minor) != 2) {
	fprintf(stderr,"%s: Not a valid VNC server\n",programName);
	return False;
    }

    fprintf(stderr,"%s: VNC server supports protocol version %d.%d "
	    "(viewer %d.%d)\n",
	    programName,major,minor,rfbProtocolMajorVersion,
	    rfbProtocolMinorVersion);

    if ((major == 3) && (minor < 3)) {
	/* if server is before 3.3 authentication won't work */
	authWillWork = False;
    } else {
	/* any other server version, just tell it what we want */
	major = rfbProtocolMajorVersion;
	minor = rfbProtocolMinorVersion;
    }

    sprintf(pv,rfbProtocolVersionFormat,major,minor);

    if (!WriteExact(sock, pv, sz_rfbProtocolVersionMsg)) return False;

    if (!ReadExact(sock, (char *)&authScheme, 4)) return False;

    authScheme = Swap32IfLE(authScheme);

    switch (authScheme) {

    case rfbConnFailed:
	if (!ReadExact(sock, (char *)&reasonLen, 4)) return False;
	reasonLen = Swap32IfLE(reasonLen);

	reason = malloc(reasonLen);

	if (!ReadExact(sock, reason, reasonLen)) return False;

	fprintf(stderr,"%s: VNC connection failed: %.*s\n",
		programName, (int)reasonLen, reason);
	return False;

    case rfbNoAuth:
	fprintf(stderr,"%s: No authentication needed\n",programName);
	break;

    case rfbVncAuth:
	if (!authWillWork) {
	    fprintf(stderr,
		    "\n%s: VNC server uses the old authentication scheme.\n"
		    "You should kill your old desktop(s) and restart.\n"
		    "If you really need to connect to this desktop use "
		    "vncviewer3.2\n\n",
		    programName);
	    return False;
	}

	if (!ReadExact(sock, (char *)challenge, CHALLENGESIZE)) return False;

	if (passwdFile) {
	    passwd = vncDecryptPasswdFromFile(passwdFile);
	} else {
	    passwd = getpass("Password: ");
	    if (strlen(passwd) == 0) {
		fprintf(stderr,"%s: Reading password failed\n",programName);
		return False;
	    }
	    if (strlen(passwd) > 8) {
		passwd[8] = '\0';
	    }
	}

	vncEncryptBytes(challenge, passwd);

	/* Lose the password from memory */
	for (i=0; i<strlen(passwd); i++) {
	    passwd[i] = '\0';
	}

	if (!WriteExact(sock, challenge, CHALLENGESIZE)) return False;

	if (!ReadExact(sock, (char *)&authResult, 4)) return False;

	authResult = Swap32IfLE(authResult);

	switch (authResult) {
	case rfbVncAuthOK:
	    fprintf(stderr,"%s: VNC authentication succeeded\n",programName);
	    break;
	case rfbVncAuthFailed:
	    fprintf(stderr,"%s: VNC authentication failed\n",programName);
	    return False;
	case rfbVncAuthTooMany:
	    fprintf(stderr,"%s: VNC authentication failed - too many tries\n",
		    programName);
	    return False;
	default:
	    fprintf(stderr,"%s: Unknown VNC authentication result: %d\n",
		    programName,(int)authResult);
	    return False;
	}
	break;

    default:
	fprintf(stderr,
		"%s: Unknown authentication scheme from VNC server: %d\n",
		programName,(int)authScheme);
	return False;
    }

    ci.shared = (shareDesktop ? 1 : 0);

    if (!WriteExact(sock, (char *)&ci, sz_rfbClientInitMsg)) return False;

    if (!ReadExact(sock, (char *)&si, sz_rfbServerInitMsg)) return False;

    si.framebufferWidth = Swap16IfLE(si.framebufferWidth);
    si.framebufferHeight = Swap16IfLE(si.framebufferHeight);
    si.format.redMax = Swap16IfLE(si.format.redMax);
    si.format.greenMax = Swap16IfLE(si.format.greenMax);
    si.format.blueMax = Swap16IfLE(si.format.blueMax);
    si.nameLength = Swap32IfLE(si.nameLength);

    desktopName = malloc(si.nameLength + 1);

    if (!ReadExact(sock, desktopName, si.nameLength)) return False;

    desktopName[si.nameLength] = 0;

    fprintf(stderr,"%s: Desktop name \"%s\"\n",programName,desktopName);

    fprintf(stderr,
	    "%s: Connected to VNC server, using protocol version %d.%d\n",
	    programName, rfbProtocolMajorVersion, rfbProtocolMinorVersion);

    fprintf(stderr,"%s: VNC server default format:\n",programName);
    PrintPixelFormat(&si.format);

    return True;
}


/*
 * SetFormatAndEncodings.
 */

Bool
SetFormatAndEncodings()
{
    rfbSetPixelFormatMsg spf;
    char buf[sz_rfbSetEncodingsMsg + MAX_ENCODINGS * 4];
    rfbSetEncodingsMsg *se = (rfbSetEncodingsMsg *)buf;
    CARD32 *encs = (CARD32 *)(&buf[sz_rfbSetEncodingsMsg]);
    int len = 0;
    int i;

    spf.type = rfbSetPixelFormat;
    spf.format = myFormat;
    spf.format.redMax = Swap16IfLE(spf.format.redMax);
    spf.format.greenMax = Swap16IfLE(spf.format.greenMax);
    spf.format.blueMax = Swap16IfLE(spf.format.blueMax);

    if (!WriteExact(rfbsock, (char *)&spf, sz_rfbSetPixelFormatMsg))
	return False;

    se->type = rfbSetEncodings;
    se->nEncodings = 0;

    for (i = 0; i < nExplicitEncodings; i++) {
	encs[se->nEncodings++] = Swap32IfLE(explicitEncodings[i]);
    }

    if (SameMachine(rfbsock)) {
	encs[se->nEncodings++] = Swap32IfLE(rfbEncodingRaw);
    }

    if (addCopyRect)
	encs[se->nEncodings++] = Swap32IfLE(rfbEncodingCopyRect);
    if (addHextile)
	encs[se->nEncodings++] = Swap32IfLE(rfbEncodingHextile);
    if (addCoRRE)
	encs[se->nEncodings++] = Swap32IfLE(rfbEncodingCoRRE);
    if (addRRE)
	encs[se->nEncodings++] = Swap32IfLE(rfbEncodingRRE);

    len = sz_rfbSetEncodingsMsg + se->nEncodings * 4;

    se->nEncodings = Swap16IfLE(se->nEncodings);

    if (!WriteExact(rfbsock, buf, len)) return False;

    return True;
}


/*
 * SendIncrementalFramebufferUpdateRequest.
 */

Bool
SendIncrementalFramebufferUpdateRequest()
{
    return SendFramebufferUpdateRequest(0, 0, si.framebufferWidth,
					si.framebufferHeight, True);
}


/*
 * SendFramebufferUpdateRequest.
 */

Bool
SendFramebufferUpdateRequest(int x, int y, int w, int h, Bool incremental)
{
    rfbFramebufferUpdateRequestMsg fur;

    fur.type = rfbFramebufferUpdateRequest;
    fur.incremental = incremental ? 1 : 0;
    fur.x = Swap16IfLE(x);
    fur.y = Swap16IfLE(y);
    fur.w = Swap16IfLE(w);
    fur.h = Swap16IfLE(h);

    if (!WriteExact(rfbsock, (char *)&fur, sz_rfbFramebufferUpdateRequestMsg))
	return False;

    gettimeofday(&updateRequestTime, NULL);

    sendUpdateRequest = False;

    return True;
}


/*
 * SendPointerEvent.
 */

Bool
SendPointerEvent(int x, int y, int buttonMask)
{
    rfbPointerEventMsg pe;

    pe.type = rfbPointerEvent;
    pe.buttonMask = buttonMask;
    if (x < 0) x = 0;
    if (y < 0) y = 0;
    pe.x = Swap16IfLE(x);
    pe.y = Swap16IfLE(y);
    return WriteExact(rfbsock, (char *)&pe, sz_rfbPointerEventMsg);
}


/*
 * SendKeyEvent.
 */

Bool
SendKeyEvent(CARD32 key, Bool down)
{
    rfbKeyEventMsg ke;

    ke.type = rfbKeyEvent;
    ke.down = down ? 1 : 0;
    ke.key = Swap32IfLE(key);
    return WriteExact(rfbsock, (char *)&ke, sz_rfbKeyEventMsg);
}


/*
 * SendClientCutText.
 */

Bool
SendClientCutText(char *str, int len)
{
    rfbClientCutTextMsg cct;

    cct.type = rfbClientCutText;
    cct.length = Swap32IfLE(len);
    return  (WriteExact(rfbsock, (char *)&cct, sz_rfbClientCutTextMsg) &&
	     WriteExact(rfbsock, str, len));
}



/*
 * HandleRFBServerMessage.
 */

Bool
HandleRFBServerMessage()
{
    rfbServerToClientMsg msg;

    if (!ReadExact(rfbsock, (char *)&msg, 1))
	return False;

    switch (msg.type) {

    case rfbSetColourMapEntries:
    {
	int i;
	CARD16 rgb[3];
	XColor xc;

	if (!ReadExact(rfbsock, ((char *)&msg) + 1,
			 sz_rfbSetColourMapEntriesMsg - 1))
	    return False;

	msg.scme.firstColour = Swap16IfLE(msg.scme.firstColour);
	msg.scme.nColours = Swap16IfLE(msg.scme.nColours);

	for (i = 0; i < msg.scme.nColours; i++) {
	    if (!ReadExact(rfbsock, (char *)rgb, 6))
		return False;
	    xc.pixel = msg.scme.firstColour + i;
	    xc.red = Swap16IfLE(rgb[0]);
	    xc.green = Swap16IfLE(rgb[1]);
	    xc.blue = Swap16IfLE(rgb[2]);
	    xc.flags = DoRed|DoGreen|DoBlue;
	    STORE_COLOUR (xc);
	}

	break;
    }

    case rfbFramebufferUpdate:
    {
	rfbFramebufferUpdateRectHeader rect;
	int linesToRead;
	int bytesPerLine;
	int i;

	if (!ReadExact(rfbsock, ((char *)&msg.fu) + 1,
			 sz_rfbFramebufferUpdateMsg - 1))
	    return False;

	msg.fu.nRects = Swap16IfLE(msg.fu.nRects);

	for (i = 0; i < msg.fu.nRects; i++) {
	    if (!ReadExact(rfbsock, (char *)&rect,
			     sz_rfbFramebufferUpdateRectHeader))
		return False;

	    rect.r.x = Swap16IfLE(rect.r.x);
	    rect.r.y = Swap16IfLE(rect.r.y);
	    rect.r.w = Swap16IfLE(rect.r.w);
	    rect.r.h = Swap16IfLE(rect.r.h);

	    rect.encoding = Swap32IfLE(rect.encoding);

	    if ((rect.r.x + rect.r.w > si.framebufferWidth) ||
		(rect.r.y + rect.r.h > si.framebufferHeight))
	    {
		fprintf(stderr,"%s: rect too large: %dx%d at (%d, %d)\n",
		       programName, rect.r.w, rect.r.h, rect.r.x, rect.r.y);
		return False;
	    }

	    if ((rect.r.h * rect.r.w) == 0) {
		fprintf(stderr,"%s: zero size rect - ignoring\n",programName);
		continue;
	    }

	    switch (rect.encoding) {

	    case rfbEncodingRaw:

		bytesPerLine = rect.r.w * myFormat.bitsPerPixel / 8;
		linesToRead = BUFFER_SIZE / bytesPerLine;

		while (rect.r.h > 0) {
		    if (linesToRead > rect.r.h)
			linesToRead = rect.r.h;

		    if (!ReadExact(rfbsock, buffer,bytesPerLine * linesToRead))
			return False;

		    CopyDataToScreen((CARD8 *)buffer, rect.r.x, rect.r.y,
				     rect.r.w, linesToRead);

		    rect.r.h -= linesToRead;
		    rect.r.y += linesToRead;

		}
		break;

	    case rfbEncodingCopyRect:
	    {
		rfbCopyRect cr;

		if (!ReadExact(rfbsock, (char *)&cr, sz_rfbCopyRect))
		    return False;

		cr.srcX = Swap16IfLE(cr.srcX);
		cr.srcY = Swap16IfLE(cr.srcY);

		COPY_AREA (cr.srcX, cr.srcY, rect.r.w, rect.r.h, rect.r.x, rect.r.y);

		break;
	    }

	    case rfbEncodingRRE:
	    {
		rfbRREHeader hdr;
		CARD8 pix8;
		CARD16 pix16;
		CARD32 pix32;
		rfbRectangle subrect;
		int j;

		if (!ReadExact(rfbsock, (char *)&hdr, sz_rfbRREHeader))
		    return False;

		hdr.nSubrects = Swap32IfLE(hdr.nSubrects);

		switch (myFormat.bitsPerPixel) {

		case 8:
		    if (!ReadExact(rfbsock, (char *)&pix8, 1))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h,
						(useBGR233 ? BGR233ToPixel[pix8] : pix8));

		    for (j = 0; j < hdr.nSubrects; j++) {
			if (!ReadExact(rfbsock, (char *)&pix8, 1))
			    return False;

			if (!ReadExact(rfbsock, (char *)&subrect,
					 sz_rfbRectangle))
			    return False;

			subrect.x = Swap16IfLE(subrect.x);
			subrect.y = Swap16IfLE(subrect.y);
			subrect.w = Swap16IfLE(subrect.w);
			subrect.h = Swap16IfLE(subrect.h);

			FILL_RECT (rect.r.x + subrect.x, rect.r.y + subrect.y, 
						subrect.w, subrect.h,
						(useBGR233 ? BGR233ToPixel[pix8] : pix8));
		    }
		    break;

		case 16:
		    if (!ReadExact(rfbsock, (char *)&pix16, 2))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h, pix16);

		    for (j = 0; j < hdr.nSubrects; j++) {
			if (!ReadExact(rfbsock, (char *)&pix16, 2))
			    return False;

			if (!ReadExact(rfbsock, (char *)&subrect,
					 sz_rfbRectangle))
			    return False;

			subrect.x = Swap16IfLE(subrect.x);
			subrect.y = Swap16IfLE(subrect.y);
			subrect.w = Swap16IfLE(subrect.w);
			subrect.h = Swap16IfLE(subrect.h);

			FILL_RECT (rect.r.x + subrect.x, rect.r.y + subrect.y, 
						subrect.w, subrect.h, pix16);
		    }
		    break;

		case 32:
		    if (!ReadExact(rfbsock, (char *)&pix32, 4))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h, pix32);

		    for (j = 0; j < hdr.nSubrects; j++) {
			if (!ReadExact(rfbsock, (char *)&pix32, 4))
			    return False;

			if (!ReadExact(rfbsock, (char *)&subrect,
					 sz_rfbRectangle))
			    return False;

			subrect.x = Swap16IfLE(subrect.x);
			subrect.y = Swap16IfLE(subrect.y);
			subrect.w = Swap16IfLE(subrect.w);
			subrect.h = Swap16IfLE(subrect.h);

			FILL_RECT (rect.r.x + subrect.x, rect.r.y + subrect.y, 
						subrect.w, subrect.h, pix32);
		    }
		    break;
		}
		break;
	    }

	    case rfbEncodingCoRRE:
	    {
		rfbRREHeader hdr;
		CARD8 pix8;
		CARD16 pix16;
		CARD32 pix32;
		int j;
		CARD8 *ptr;
		register int x, y, w, h;

		if (!ReadExact(rfbsock, (char *)&hdr, sz_rfbRREHeader))
		    return False;

		hdr.nSubrects = Swap32IfLE(hdr.nSubrects);

		switch (myFormat.bitsPerPixel) {

		case 8:
		    if (!ReadExact(rfbsock, (char *)&pix8, 1))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h,
						(useBGR233 ? BGR233ToPixel[pix8] : pix8));

		    if (!ReadExact(rfbsock, buffer, hdr.nSubrects * 5))
			return False;

		    ptr = (CARD8 *)buffer;

		    for (j = 0; j < hdr.nSubrects; j++) {
			pix8 = *ptr++;
			x = *ptr++;
			y = *ptr++;
			w = *ptr++;
			h = *ptr++;
			FILL_RECT (rect.r.x + x, rect.r.y + y, w, h, 
						(useBGR233 ? BGR233ToPixel[pix8] : pix8));
		    }
		    break;

		case 16:
		    if (!ReadExact(rfbsock, (char *)&pix16, 2))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h, pix16);

		    if (!ReadExact(rfbsock, buffer, hdr.nSubrects * 6))
			return False;

		    ptr = (CARD8 *)buffer;

		    for (j = 0; j < hdr.nSubrects; j++) {
			pix16 = *(CARD16 *)ptr;
			ptr += 2;
			x = *ptr++;
			y = *ptr++;
			w = *ptr++;
			h = *ptr++;
			FILL_RECT (rect.r.x + x, rect.r.y + y, w, h, pix16);
		    }
		    break;

		case 32:
		    if (!ReadExact(rfbsock, (char *)&pix32, 4))
			return False;

			FILL_RECT (rect.r.x, rect.r.y, rect.r.w, rect.r.h, pix32);

		    if (!ReadExact(rfbsock, buffer, hdr.nSubrects * 8))
			return False;

		    ptr = (CARD8 *)buffer;

		    for (j = 0; j < hdr.nSubrects; j++) {
			pix32 = *(CARD32 *)ptr;
			ptr += 4;
			x = *ptr++;
			y = *ptr++;
			w = *ptr++;
			h = *ptr++;
			FILL_RECT (rect.r.x + x, rect.r.y + y, w, h, pix32);
		    }
		    break;
		}
		break;
	    }

	    case rfbEncodingHextile:
	    {
		switch (myFormat.bitsPerPixel) {
		case 8:
		    if (!HandleHextileEncoding8(rect.r.x, rect.r.y,
						rect.r.w, rect.r.h))
			return False;
		    break;
		case 16:
		    if (!HandleHextileEncoding16(rect.r.x, rect.r.y,
						 rect.r.w, rect.r.h))
			return False;
		    break;
		case 32:
		    if (!HandleHextileEncoding32(rect.r.x, rect.r.y,
						 rect.r.w, rect.r.h))
			return False;
		    break;
		}
		break;
	    }

	    default:
		fprintf(stderr,"%s: unknown rect encoding %d\n",programName,
		       (int)rect.encoding);
		return False;
	    }
	}

	sendUpdateRequest = True;

	break;
    }

    case rfbBell:
	BELL;
	break;

    case rfbServerCutText:
    {
	char *str;

	if (!ReadExact(rfbsock, ((char *)&msg) + 1,
			 sz_rfbServerCutTextMsg - 1))
	    return False;

	msg.sct.length = Swap32IfLE(msg.sct.length);

	str = malloc(msg.sct.length);

	if (!ReadExact(rfbsock, str, msg.sct.length))
	    return False;
/*
	XSelectInput(dpy, DefaultRootWindow(dpy), 0);
	XStoreBytes(dpy, str, msg.sct.length);
	XSetSelectionOwner(dpy, XA_PRIMARY, None, CurrentTime);
	XSelectInput(dpy, DefaultRootWindow(dpy), PropertyChangeMask);
*/
	free(str);

	break;
    }

    default:
	fprintf(stderr,"%s: unknown message type %d from VNC server\n",
	       programName,msg.type);
	return False;
    }

    return True;
}


#define GET_PIXEL8(pix, ptr) ((pix) = *(ptr)++)

#define GET_PIXEL16(pix, ptr) (((CARD8*)&(pix))[0] = *(ptr)++, \
			       ((CARD8*)&(pix))[1] = *(ptr)++)

#define GET_PIXEL32(pix, ptr) (((CARD8*)&(pix))[0] = *(ptr)++, \
			       ((CARD8*)&(pix))[1] = *(ptr)++, \
			       ((CARD8*)&(pix))[2] = *(ptr)++, \
			       ((CARD8*)&(pix))[3] = *(ptr)++)

#define DEFINE_HEXTILE(bpp)                                                   \
static Bool                                                                   \
HandleHextileEncoding##bpp(int rx, int ry, int rw, int rh)                    \
{                                                                             \
    CARD##bpp bg, fg;                                                         \
    int i, col;                                                               \
    CARD8 *ptr;                                                               \
    int x, y, w, h;                                                           \
    int sx, sy, sw, sh;                                                       \
    CARD8 subencoding;                                                        \
    CARD8 nSubrects;                                                          \
                                                                              \
    for (y = ry; y < ry+rh; y += 16) {                                        \
        for (x = rx; x < rx+rw; x += 16) {                                    \
            w = h = 16;                                                       \
            if (rx+rw - x < 16)                                               \
                w = rx+rw - x;                                                \
            if (ry+rh - y < 16)                                               \
                h = ry+rh - y;                                                \
                                                                              \
            if (!ReadExact(rfbsock, (char *)&subencoding, 1))                 \
                return False;                                                 \
                                                                              \
            if (subencoding & rfbHextileRaw) {                                \
                if (!ReadExact(rfbsock, buffer, w * h * (bpp / 8)))           \
                    return False;                                             \
                                                                              \
                CopyDataToScreen((CARD8 *)buffer, x, y, w, h);                \
                continue;                                                     \
            }                                                                 \
                                                                              \
            if (subencoding & rfbHextileBackgroundSpecified)                  \
                if (!ReadExact(rfbsock, (char *)&bg, (bpp/8)))                \
                    return False;                                             \
                                                                              \
            if ((bpp == 8) && useBGR233)                                      \
                col = BGR233ToPixel[bg];                                      \
            else                                                              \
                col = bg;                                                     \
                                                                              \
			FILL_RECT (x, y, w, h, col);                                      \
                                                                              \
            if (subencoding & rfbHextileForegroundSpecified)                  \
                if (!ReadExact(rfbsock, (char *)&fg, (bpp/8)))                \
                    return False;                                             \
                                                                              \
            if (!(subencoding & rfbHextileAnySubrects)) {                     \
                continue;                                                     \
            }                                                                 \
                                                                              \
            if (!ReadExact(rfbsock, (char *)&nSubrects, 1))                   \
                return False;                                                 \
                                                                              \
            ptr = (CARD8 *)buffer;                                            \
                                                                              \
            if (subencoding & rfbHextileSubrectsColoured) {                   \
                if (!ReadExact(rfbsock, buffer, nSubrects * (2 + (bpp / 8)))) \
                    return False;                                             \
                                                                              \
                for (i = 0; i < nSubrects; i++) {                             \
                    GET_PIXEL##bpp(fg, ptr);                                  \
                    sx = rfbHextileExtractX(*ptr);                            \
                    sy = rfbHextileExtractY(*ptr);                            \
                    ptr++;                                                    \
                    sw = rfbHextileExtractW(*ptr);                            \
                    sh = rfbHextileExtractH(*ptr);                            \
                    ptr++;                                                    \
                    if ((bpp == 8) && useBGR233)                              \
                        col = BGR233ToPixel[fg];                              \
                    else                                                      \
                        col = fg;                                             \
                                                                              \
					FILL_RECT (x + sx, y + sy, sw, sh, col);                  \
                }                                                             \
                                                                              \
            } else {                                                          \
                if (!ReadExact(rfbsock, buffer, nSubrects * 2))               \
                    return False;                                             \
                                                                              \
                if ((bpp == 8) && useBGR233)                                  \
                    col = BGR233ToPixel[fg];                                  \
                else                                                          \
                    col = fg;                                                 \
                                                                              \
                for (i = 0; i < nSubrects; i++) {                             \
                    sx = rfbHextileExtractX(*ptr);                            \
                    sy = rfbHextileExtractY(*ptr);                            \
                    ptr++;                                                    \
                    sw = rfbHextileExtractW(*ptr);                            \
                    sh = rfbHextileExtractH(*ptr);                            \
                    ptr++;                                                    \
					FILL_RECT (x + sx, y + sy, sw, sh, col);                  \
                }                                                             \
            }                                                                 \
        }                                                                     \
    }                                                                         \
                                                                              \
    return True;                                                              \
}

DEFINE_HEXTILE(8)
DEFINE_HEXTILE(16)
DEFINE_HEXTILE(32)


/*
 * PrintPixelFormat.
 */

static void
PrintPixelFormat(format)
    rfbPixelFormat *format;
{
    if (format->bitsPerPixel == 1) {
	fprintf(stderr,"Single bit per pixel.\n");
	fprintf(stderr,
		"%s significant bit in each byte is leftmost on the screen.\n",
		(format->bigEndian ? "Most" : "Least"));
    } else {
	fprintf(stderr,"%d bits per pixel.\n",format->bitsPerPixel);
	if (format->bitsPerPixel != 8) {
	    fprintf(stderr,"%s significant byte first in each pixel.\n",
		    (format->bigEndian ? "Most" : "Least"));
	}
	if (format->trueColour) {
	    fprintf(stderr,"True colour: max red %d green %d blue %d\n",
		    format->redMax, format->greenMax, format->blueMax);
	    fprintf(stderr,"            shift red %d green %d blue %d\n",
		    format->redShift, format->greenShift, format->blueShift);
	} else {
	    fprintf(stderr,"Uses a colour map (not true colour).\n");
	}
    }
}