/*
 *  This file is called main.c, because it contains most of the new functions
 *  for use with LibVNCServer.
 *
 *  LibVNCServer (C) 2001 Johannes E. Schindelin <Johannes.Schindelin@gmx.de>
 *  Original OSXvnc (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
 *  Original Xvnc (C) 1999 AT&T Laboratories Cambridge.
 *  All Rights Reserved.
 *
 *  see GPL (latest version) for full details
 */

#define _CRT_SECURE_NO_WARNINGS
#ifdef __STRICT_ANSI__
#define _BSD_SOURCE
#endif
#include "rfb/rfb.h"
#include "rfb/rfbregion.h"
#include "private.h"
#include "defines.h"

#ifndef false
#define false 0
#define true -1
#endif

#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include <signal.h>
#include <time.h>

static int extMutex_initialized = 0;
static int logMutex_initialized = 0;
#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
static MUTEX(logMutex);
static MUTEX(extMutex);
#endif

#ifdef LIBVNCSERVER_WORDS_BIGENDIAN
char rfbEndianTest = (1==0);
#else
char rfbEndianTest = (1==1);
#endif

/*
 * Protocol extensions
 */

static rfbProtocolExtension* rfbExtensionHead = NULL;

/*
 * This method registers a list of new extensions.
 * It avoids same extension getting registered multiple times.
 * The order is not preserved if multiple extensions are
 * registered at one-go.
 */
void
rfbRegisterProtocolExtension(rfbProtocolExtension* extension)
{
    rfbProtocolExtension *head = rfbExtensionHead, *next = NULL;

    if(extension == NULL)
        return;

    next = extension->next;

    if (! extMutex_initialized)
    {
        INIT_MUTEX(extMutex);
        extMutex_initialized = 1;
    }

    LOCK(extMutex);

    while(head != NULL)
    {
        if(head == extension)
        {
            UNLOCK(extMutex);
            rfbRegisterProtocolExtension(next);
            return;
        }

        head = head->next;
    }

    extension->next = rfbExtensionHead;
    rfbExtensionHead = extension;

    UNLOCK(extMutex);
    rfbRegisterProtocolExtension(next);
}

/*
 * This method unregisters a list of extensions.
 * These extensions won't be available for any new
 * client connection.
 */
void
rfbUnregisterProtocolExtension(rfbProtocolExtension* extension)
{

    rfbProtocolExtension *cur = NULL, *pre = NULL;

    if(extension == NULL)
        return;

    if (! extMutex_initialized)
    {
        INIT_MUTEX(extMutex);
        extMutex_initialized = 1;
    }

    LOCK(extMutex);

    if(rfbExtensionHead == extension)
    {
        rfbExtensionHead = rfbExtensionHead->next;
        UNLOCK(extMutex);
        rfbUnregisterProtocolExtension(extension->next);
        return;
    }

    cur = pre = rfbExtensionHead;

    while(cur)
    {
        if(cur == extension)
        {
            pre->next = cur->next;
            break;
        }
        pre = cur;
        cur = cur->next;
    }

    UNLOCK(extMutex);

    rfbUnregisterProtocolExtension(extension->next);
}

rfbProtocolExtension* rfbGetExtensionIterator()
{
    if (! extMutex_initialized)
    {
        INIT_MUTEX(extMutex);
        extMutex_initialized = 1;
    }

    LOCK(extMutex);
    return rfbExtensionHead;
}

void rfbReleaseExtensionIterator()
{
    UNLOCK(extMutex);
}

rfbBool rfbEnableExtension(rfbClientPtr cl, rfbProtocolExtension* extension,
                           void* data)
{
    rfbExtensionData* extData;

    /* make sure extension is not yet enabled. */
    for(extData = cl->extensions; extData; extData = extData->next)
        if(extData->extension == extension)
            return FALSE;

    extData = MemAlloc(sizeof(rfbExtensionData));
    extData->extension = extension;
    extData->data = data;
    extData->next = cl->extensions;
    cl->extensions = extData;

    return TRUE;
}

rfbBool rfbDisableExtension(rfbClientPtr cl, rfbProtocolExtension* extension)
{
    rfbExtensionData* extData;
    rfbExtensionData* prevData = NULL;

    for(extData = cl->extensions; extData; extData = extData->next)
    {
        if(extData->extension == extension)
        {
            if(extData->data)
                MemFree(extData->data);
            if(prevData == NULL)
                cl->extensions = extData->next;
            else
                prevData->next = extData->next;
            return TRUE;
        }
        prevData = extData;
    }

    return FALSE;
}

void* rfbGetExtensionClientData(rfbClientPtr cl, rfbProtocolExtension* extension)
{
    rfbExtensionData* data = cl->extensions;

    while(data && data->extension != extension)
        data = data->next;

    if(data == NULL)
    {
        /* rfbCloseClient(cl); */
        return NULL;
    }

    return data->data;
}


void rfbScheduleCopyRegion(rfbScreenInfoPtr rfbScreen,sraRegionPtr copyRegion,int dx,int dy)
{
    rfbClientIteratorPtr iterator;
    rfbClientPtr cl;

    iterator=rfbGetClientIterator(rfbScreen);
    while((cl=rfbClientIteratorNext(iterator)))
    {
        EnterCriticalSection(&cl->csRgn);
            LOCK(cl->updateMutex);
            if(cl->useCopyRect)
            {
                sraRegionPtr modifiedRegionBackup;
                if(!sraRgnEmpty(cl->copyRegion))
                {
                    if(cl->copyDX!=dx || cl->copyDY!=dy)
                    {
                        /* if a copyRegion was not yet executed, treat it as a
                         * modifiedRegion. The idea: in this case it could be
                         * source of the new copyRect or modified anyway. */
                        sraRgnOr(cl->modifiedRegion,cl->copyRegion);
                        sraRgnMakeEmpty(cl->copyRegion);
                    }
                    else
                    {
                        /* we have to set the intersection of the source of the copy
                         * and the old copy to modified. */
                        modifiedRegionBackup=sraRgnCreateRgn(copyRegion);
                        sraRgnOffset(modifiedRegionBackup,-dx,-dy);
                        sraRgnAnd(modifiedRegionBackup,cl->copyRegion);
                        sraRgnOr(cl->modifiedRegion,modifiedRegionBackup);
                        sraRgnDestroy(modifiedRegionBackup);
                    }
                }

                sraRgnOr(cl->copyRegion,copyRegion);
                cl->copyDX = dx;
                cl->copyDY = dy;

                /* if there were modified regions, which are now copied,
                * mark them as modified, because the source of these can be overlapped
                * either by new modified or now copied regions. */
                modifiedRegionBackup=sraRgnCreateRgn(cl->modifiedRegion);
                sraRgnOffset(modifiedRegionBackup,dx,dy);
                sraRgnAnd(modifiedRegionBackup,cl->copyRegion);
                sraRgnOr(cl->modifiedRegion,modifiedRegionBackup);
                sraRgnDestroy(modifiedRegionBackup);

                if(!cl->enableCursorShapeUpdates)
                {
                    /*
                     * n.b. (dx, dy) is the vector pointing in the direction the
                     * copyrect displacement will take place.  copyRegion is the
                     * destination rectangle (say), not the source rectangle.
                     */
                    sraRegionPtr cursorRegion;
                    int x = cl->cursorX - cl->screen->cursor->xhot;
                    int y = cl->cursorY - cl->screen->cursor->yhot;
                    int w = cl->screen->cursor->width;
                    int h = cl->screen->cursor->height;

                    cursorRegion = sraRgnCreateRect(x, y, x + w, y + h);
                    sraRgnAnd(cursorRegion, cl->copyRegion);
                    if(!sraRgnEmpty(cursorRegion))
                    {
                        /*
                         * current cursor rect overlaps with the copy region *dest*,
                         * mark it as modified since we won't copy-rect stuff to it.
                         */
                        sraRgnOr(cl->modifiedRegion, cursorRegion);
                    }
                    sraRgnDestroy(cursorRegion);

                    cursorRegion = sraRgnCreateRect(x, y, x + w, y + h);
                    /* displace it to check for overlap with copy region source: */
                    sraRgnOffset(cursorRegion, dx, dy);
                    sraRgnAnd(cursorRegion, cl->copyRegion);
                    if(!sraRgnEmpty(cursorRegion))
                    {
                        /*
                         * current cursor rect overlaps with the copy region *source*,
                         * mark the *displaced* cursorRegion as modified since we
                         * won't copyrect stuff to it.
                         */
                        sraRgnOr(cl->modifiedRegion, cursorRegion);
                    }
                    sraRgnDestroy(cursorRegion);
                }

            }
            else
            {
                sraRgnOr(cl->modifiedRegion,copyRegion);
            }
            TSIGNAL(cl->updateCond);
            UNLOCK(cl->updateMutex);
        LeaveCriticalSection(&cl->csRgn);
    }

    rfbReleaseClientIterator(iterator);
}

void rfbDoCopyRegion(rfbScreenInfoPtr screen,sraRegionPtr copyRegion,int dx,int dy)
{
    sraRectangleIterator* i;
    sraRect rect;
    int j,widthInBytes,bpp=screen->serverFormat.bitsPerPixel/8,
                       rowstride=screen->paddedWidthInBytes;
    char *in,*out;

    /* copy it, really */
    i = sraRgnGetReverseIterator(copyRegion,dx<0,dy<0);
    while(sraRgnIteratorNext(i,&rect))
    {
        widthInBytes = (rect.x2-rect.x1)*bpp;
        out = screen->frameBuffer+rect.x1*bpp+rect.y1*rowstride;
        in = screen->frameBuffer+(rect.x1-dx)*bpp+(rect.y1-dy)*rowstride;
        if(dy<0)
            for(j=rect.y1; j<rect.y2; j++,out+=rowstride,in+=rowstride)
                memcpy(out,in,widthInBytes);
        else
        {
            out += rowstride*(rect.y2-rect.y1-1);
            in += rowstride*(rect.y2-rect.y1-1);
            for(j=rect.y2-1; j>=rect.y1; j--,out-=rowstride,in-=rowstride)
                memcpy(out,in,widthInBytes);
        }
    }
    sraRgnReleaseIterator(i);

    rfbScheduleCopyRegion(screen,copyRegion,dx,dy);
}

void rfbDoCopyRect(rfbScreenInfoPtr screen,int x1,int y1,int x2,int y2,int dx,int dy)
{
    sraRegionPtr region = sraRgnCreateRect(x1,y1,x2,y2);
    rfbDoCopyRegion(screen,region,dx,dy);
    sraRgnDestroy(region);
}

void rfbScheduleCopyRect(rfbScreenInfoPtr screen,int x1,int y1,int x2,int y2,int dx,int dy)
{
    sraRegionPtr region = sraRgnCreateRect(x1,y1,x2,y2);
    rfbScheduleCopyRegion(screen,region,dx,dy);
    sraRgnDestroy(region);
}

void rfbMarkRegionAsModified(rfbScreenInfoPtr screen,sraRegionPtr modRegion)
{
    rfbClientIteratorPtr iterator;
    rfbClientPtr cl;

    iterator=rfbGetClientIterator(screen);
    while((cl=rfbClientIteratorNext(iterator)))
    {
        LOCK(cl->updateMutex);
        EnterCriticalSection(&cl->csRgn);
            sraRgnOr(cl->modifiedRegion,modRegion);
        LeaveCriticalSection(&cl->csRgn);
        TSIGNAL(cl->updateCond);
        UNLOCK(cl->updateMutex);
    }

    rfbReleaseClientIterator(iterator);
}

void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2);
void rfbMarkRectAsModified(rfbScreenInfoPtr screen,int x1,int y1,int x2,int y2)
{
    sraRegionPtr region;
    int i;

    if(x1>x2)
    {
        i=x1;
        x1=x2;
        x2=i;
    }
    if(x1<0) x1=0;
    if(x2>screen->width) x2=screen->width;
    if(x1==x2) return;

    if(y1>y2)
    {
        i=y1;
        y1=y2;
        y2=i;
    }
    if(y1<0) y1=0;
    if(y2>screen->height) y2=screen->height;
    if(y1==y2) return;

    /* update scaled copies for this rectangle */
 //   rfbScaledScreenUpdate(screen,x1,y1,x2,y2);

    region = sraRgnCreateRect(x1,y1,x2,y2);
    rfbMarkRegionAsModified(screen,region);
    sraRgnDestroy(region);
    Sleep(0);
}

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
#include <unistd.h>

static void *
clientOutput(void *data)
{
    rfbClientPtr cl = (rfbClientPtr)data;
    rfbBool haveUpdate;
    sraRegion* updateRegion;

    while (1)
    {
        haveUpdate = false;
        while (!haveUpdate)
        {
            if (cl->sock == -1)
            {
                /* Client has disconnected. */
                return NULL;
            }
            if (cl->state != RFB_NORMAL || cl->onHold)
            {
                /* just sleep until things get normal */
                usleep(cl->screen->deferUpdateTime * 1000);
                continue;
            }

            LOCK(cl->updateMutex);

            if (sraRgnEmpty(cl->requestedRegion))
            {
                ; /* always require a FB Update Request (otherwise can crash.) */
            }
            else
            {
                haveUpdate = FB_UPDATE_PENDING(cl);
                if(!haveUpdate)
                {
                    updateRegion = sraRgnCreateRgn(cl->modifiedRegion);
                    haveUpdate   = sraRgnAnd(updateRegion,cl->requestedRegion);
                    sraRgnDestroy(updateRegion);
                }
            }

            if (!haveUpdate)
            {
                WAIT(cl->updateCond, cl->updateMutex);
            }

            UNLOCK(cl->updateMutex);
        }

        /* OK, now, to save bandwidth, wait a little while for more
           updates to come along. */
        usleep(cl->screen->deferUpdateTime * 1000);

        /* Now, get the region we're going to update, and remove
           it from cl->modifiedRegion _before_ we send the update.
           That way, if anything that overlaps the region we're sending
           is updated, we'll be sure to do another update later. */
        LOCK(cl->updateMutex);
        updateRegion = sraRgnCreateRgn(cl->modifiedRegion);
        UNLOCK(cl->updateMutex);

        /* Now actually send the update. */
        rfbIncrClientRef(cl);
        LOCK(cl->sendMutex);
        rfbSendFramebufferUpdate(cl, updateRegion);
        UNLOCK(cl->sendMutex);
        rfbDecrClientRef(cl);

        sraRgnDestroy(updateRegion);
    }

    /* Not reached. */
    return NULL;
}

static void *
clientInput(void *data)
{
    rfbClientPtr cl = (rfbClientPtr)data;
    pthread_t output_thread;
    pthread_create(&output_thread, NULL, clientOutput, (void *)cl);

    while (1)
    {
        fd_set rfds, wfds, efds;
        struct timeval tv;
        int n;

        if (cl->sock == -1)
        {
            /* Client has disconnected. */
            break;
        }

        FD_ZERO(&rfds);
        FD_SET(cl->sock, &rfds);
        FD_ZERO(&efds);
        FD_SET(cl->sock, &efds);

        /* Are we transferring a file in the background? */
        FD_ZERO(&wfds);
        if ((cl->fileTransfer.fd!=-1) && (cl->fileTransfer.sending==1))
            FD_SET(cl->sock, &wfds);

        tv.tv_sec = 60; /* 1 minute */
        tv.tv_usec = 0;
        n = select(cl->sock + 1, &rfds, &wfds, &efds, &tv);
        if (n < 0)
        {
            break;
        }
        if (n == 0) /* timeout */
        {
            rfbSendFileTransferChunk(cl);
            continue;
        }

        /* We have some space on the transmit queue, send some data */
        if (FD_ISSET(cl->sock, &wfds))
            rfbSendFileTransferChunk(cl);

        if (FD_ISSET(cl->sock, &rfds) || FD_ISSET(cl->sock, &efds))
            rfbProcessClientMessage(cl);
    }

    /* Get rid of the output thread. */
    LOCK(cl->updateMutex);
    TSIGNAL(cl->updateCond);
    UNLOCK(cl->updateMutex);
    IF_PTHREADS(pthread_join(output_thread, NULL));

    rfbClientConnectionGone(cl);

    return NULL;
}

static void*
listenerRun(void *data)
{
    rfbScreenInfoPtr screen=(rfbScreenInfoPtr)data;
    int client_fd;
    struct sockaddr_in peer;
    rfbClientPtr cl;
    socklen_t len;

    len = sizeof(peer);

    /* TODO: this thread wont die by restarting the server */
    /* TODO: HTTP is not handled */
    while ((client_fd = accept(screen->listenSock,
                               (struct sockaddr*)&peer, &len)) != -1)
    {
        cl = rfbNewClient(screen,client_fd);
        len = sizeof(peer);

        if (cl && !cl->onHold )
            rfbStartOnHoldClient(cl);
    }
    return(NULL);
}

void
rfbStartOnHoldClient(rfbClientPtr cl)
{
    pthread_create(&cl->client_thread, NULL, clientInput, (void *)cl);
}

#else

void
rfbStartOnHoldClient(rfbClientPtr cl)
{
    cl->onHold = FALSE;
}

#endif

void
rfbRefuseOnHoldClient(rfbClientPtr cl)
{
    rfbCloseClient(cl);
    rfbClientConnectionGone(cl);
}

static void
rfbDefaultKbdAddEvent(rfbBool down, rfbKeySym keySym, rfbClientPtr cl)
{
}

void
rfbDefaultPtrAddEvent(int buttonMask, int x, int y, rfbClientPtr cl)
{
    rfbClientIteratorPtr iterator;
    rfbClientPtr other_client;
    rfbScreenInfoPtr s = cl->screen;

    if (x != s->cursorX || y != s->cursorY)
    {
        LOCK(s->cursorMutex);
        s->cursorX = x;
        s->cursorY = y;
        UNLOCK(s->cursorMutex);

        /* The cursor was moved by this client, so don't send CursorPos. */
        if (cl->enableCursorPosUpdates)
        {
            if (cl->cursorWasMoved)
                cl->cursorWasMoved = FALSE;
            else
                cl->cursorWasMoved = TRUE;
        }

        /* But inform all remaining clients about this cursor movement. */
        iterator = rfbGetClientIterator(s);
        while ((other_client = rfbClientIteratorNext(iterator)) != NULL)
        {
            if (other_client != cl && other_client->enableCursorPosUpdates)
            {
                other_client->cursorWasMoved = TRUE;
            }
        }
        rfbReleaseClientIterator(iterator);
    }
}

static void rfbDefaultSetXCutText(char* text, int len, rfbClientPtr cl)
{
}

/* TODO: add a nice VNC or RFB cursor */

#if defined(WIN32) || defined(sparc) || !defined(NO_STRICT_ANSI)
static rfbCursor myCursor =
{
    FALSE, FALSE, FALSE, FALSE,
    (unsigned char*)"\000\102\044\030\044\102\000",
    (unsigned char*)"\347\347\176\074\176\347\347",
    8, 7, 3, 3,
    0, 0, 0,
    0xffff, 0xffff, 0xffff,
    NULL
};
#else
static rfbCursor myCursor =
{
cleanup:
    FALSE,
cleanupSource:
    FALSE,
cleanupMask:
    FALSE,
cleanupRichSource:
    FALSE,
source: "\000\102\044\030\044\102\000"
    ,
mask:   "\347\347\176\074\176\347\347"
    ,
    width: 8, height: 7, xhot: 3, yhot: 3,
    foreRed: 0, foreGreen: 0, foreBlue: 0,
    backRed: 0xffff, backGreen: 0xffff, backBlue: 0xffff,
richSource:
    NULL
};
#endif

static rfbCursorPtr rfbDefaultGetCursorPtr(rfbClientPtr cl)
{
    return(cl->screen->cursor);
}

/* response is cl->authChallenge vncEncrypted with passwd */
static rfbBool rfbDefaultPasswordCheck(rfbClientPtr cl,const char* response,int len)
{
    int i;
    char *passwd=(char*)cl->screen->authPasswdData;

    rfbEncryptBytes(cl->authChallenge, passwd);

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

    MemFree(passwd);

    if (memcmp(cl->authChallenge, response, len) != 0)
    {
        return(FALSE);
    }

    return(TRUE);
}

/* for this method, authPasswdData is really a pointer to an array
   of char*'s, where the last pointer is 0. */
rfbBool rfbCheckPasswordByList(rfbClientPtr cl,const char* response,int len)
{
    char **passwds;
    int i=0;

    for(passwds=(char**)cl->screen->authPasswdData; *passwds; passwds++,i++)
    {
        uint8_t auth_tmp[CHALLENGESIZE];
        memcpy((char *)auth_tmp, (char *)cl->authChallenge, CHALLENGESIZE);
        rfbEncryptBytes(auth_tmp, *passwds);

        if (memcmp(auth_tmp, response, len) == 0)
        {
            if(i>=cl->screen->authPasswdFirstViewOnly)
                cl->viewOnly=TRUE;
            return(TRUE);
        }
    }

    return(FALSE);
}

void rfbDoNothingWithClient(rfbClientPtr cl)
{
}

static enum rfbNewClientAction rfbDefaultNewClientHook(rfbClientPtr cl)
{
    return RFB_CLIENT_ACCEPT;
}

/*
 * Update server's pixel format in screenInfo structure. This
 * function is called from rfbGetScreen() and rfbNewFramebuffer().
 */

static void rfbInitServerFormat(rfbScreenInfoPtr screen, int bitsPerSample)
{
    rfbPixelFormat* format=&screen->serverFormat;

    format->bitsPerPixel = screen->bitsPerPixel;
    format->depth = screen->depth;
    format->bigEndian = rfbEndianTest?FALSE:TRUE;
    format->trueColour = TRUE;
    screen->colourMap.count = 0;
    screen->colourMap.is16 = 0;
    screen->colourMap.data.bytes = NULL;

    if (format->bitsPerPixel == 8)
    {
        format->redMax = 7;
        format->greenMax = 7;
        format->blueMax = 3;
        format->redShift = 0;
        format->greenShift = 3;
        format->blueShift = 6;
    }
    else
    {
        format->redMax = (1 << bitsPerSample) - 1;
        format->greenMax = (1 << bitsPerSample) - 1;
        format->blueMax = (1 << bitsPerSample) - 1;
        if(rfbEndianTest)
        {
            format->redShift = 0;
            format->greenShift = bitsPerSample;
            format->blueShift = bitsPerSample * 2;
        }
        else
        {
            if(format->bitsPerPixel==8*3)
            {
                format->redShift = bitsPerSample*2;
                format->greenShift = bitsPerSample*1;
                format->blueShift = 0;
            }
            else
            {
                format->redShift = bitsPerSample*3;
                format->greenShift = bitsPerSample*2;
                format->blueShift = bitsPerSample;
            }
        }
    }
}

rfbScreenInfoPtr rfbGetScreen(int* argc,char** argv,
                              int width,int height,int bitsPerSample,int samplesPerPixel,
                              int bytesPerPixel)
{
    DWORD dwDummy=255;
    rfbScreenInfoPtr screen=MemAlloc(sizeof(rfbScreenInfo));

    if (! logMutex_initialized)
    {
        INIT_MUTEX(logMutex);
        logMutex_initialized = 1;
    }


    screen->autoPort=FALSE;
    screen->clientHead=NULL;
    screen->pointerClient=NULL;
    screen->port=5900;
    screen->socketState=RFB_SOCKET_INIT;

    screen->inetdInitDone = FALSE;
    screen->inetdSock=-1;

    screen->backconnect = FALSE;
    screen->connectSock = -1;

    screen->udpSock=-1;
    screen->udpSockConnected=FALSE;
    screen->udpPort=0;
    screen->udpClient=NULL;

    screen->maxFd=0;
    screen->listenSock=-1;

    screen->alwaysShared = FALSE;
    screen->neverShared = FALSE;
    screen->dontDisconnect = FALSE;
    screen->authPasswdData = NULL;
    screen->authPasswdFirstViewOnly = 1;

    screen->width = width;
    screen->height = height;
    screen->bitsPerPixel = screen->depth = 8*bytesPerPixel;

    screen->passwordCheck = rfbDefaultPasswordCheck;

    screen->ignoreSIGPIPE = TRUE;

    /* disable progressive updating per default */
    screen->progressiveSliceHeight = 0;

    screen->listenInterface = htonl(INADDR_ANY);

    screen->deferUpdateTime=5;
    screen->maxRectsPerUpdate=50;

    screen->handleEventsEagerly = FALSE;

    screen->protocolMajorVersion = rfbProtocolMajorVersion;
    screen->protocolMinorVersion = rfbProtocolMinorVersion;

    ///screen->permitFileTransfer = FALSE;

    GetComputerName(screen->thisHost,&dwDummy);

    screen->paddedWidthInBytes = width*bytesPerPixel;

    /* format */

    rfbInitServerFormat(screen, bitsPerSample);

    /* cursor */

    screen->cursorX=screen->cursorY=screen->underCursorBufferLen=0;
    screen->underCursorBuffer=NULL;
    screen->dontConvertRichCursorToXCursor = FALSE;
    screen->cursor = &myCursor;
    INIT_MUTEX(screen->cursorMutex);

    IF_PTHREADS(screen->backgroundLoop = FALSE);

    /* proc's and hook's */

    screen->kbdAddEvent = rfbDefaultKbdAddEvent;
    screen->kbdReleaseAllKeys = rfbDoNothingWithClient;
    screen->ptrAddEvent = rfbDefaultPtrAddEvent;
    screen->setXCutText = rfbDefaultSetXCutText;
    screen->getCursorPtr = rfbDefaultGetCursorPtr;
    screen->setTranslateFunction = rfbSetTranslateFunction;
    screen->newClientHook = rfbDefaultNewClientHook;
    screen->displayHook = NULL;
    screen->displayFinishedHook = NULL;
    screen->getKeyboardLedStateHook = NULL;
    screen->xvpHook = NULL;

    /* initialize client list and iterator mutex */
    rfbClientListInit(screen);

    return(screen);
}

/*
 * Switch to another framebuffer (maybe of different size and color
 * format). Clients supporting NewFBSize pseudo-encoding will change
 * their local framebuffer dimensions if necessary.
 * NOTE: Rich cursor data should be converted to new pixel format by
 * the caller.
 */

void rfbNewFramebuffer(rfbScreenInfoPtr screen, char *framebuffer,
                       int width, int height,
                       int bitsPerSample, int samplesPerPixel,
                       int bytesPerPixel)
{
    rfbPixelFormat old_format;
    rfbBool format_changed = FALSE;
    rfbClientIteratorPtr iterator;
    rfbClientPtr cl;

    /* Update information in the screenInfo structure */

    old_format = screen->serverFormat;

    screen->width = width;
    screen->height = height;
    screen->bitsPerPixel = screen->depth = 8*bytesPerPixel;
    screen->paddedWidthInBytes = width*bytesPerPixel;

    rfbInitServerFormat(screen, bitsPerSample);

    if (memcmp(&screen->serverFormat, &old_format,
               sizeof(rfbPixelFormat)) != 0)
    {
        format_changed = TRUE;
    }

    screen->frameBuffer = framebuffer;

    /* Adjust pointer position if necessary */

    if (screen->cursorX >= width)
        screen->cursorX = width - 1;
    if (screen->cursorY >= height)
        screen->cursorY = height - 1;

    /* For each client: */
    iterator = rfbGetClientIterator(screen);
    while ((cl = rfbClientIteratorNext(iterator)) != NULL)
    {

        /* Re-install color translation tables if necessary */

        if (format_changed)
            screen->setTranslateFunction(cl);

        /* Mark the screen contents as changed, and schedule sending
           NewFBSize message if supported by this client. */

        LOCK(cl->updateMutex);
        EnterCriticalSection(&cl->csRgn);
            sraRgnDestroy(cl->modifiedRegion);
            cl->modifiedRegion = sraRgnCreateRect(0, 0, width, height);
            sraRgnMakeEmpty(cl->copyRegion);
        LeaveCriticalSection(&cl->csRgn);
        cl->copyDX = 0;
        cl->copyDY = 0;

        if (cl->useNewFBSize)
            cl->newFBSizePending = TRUE;

        TSIGNAL(cl->updateCond);
        UNLOCK(cl->updateMutex);
    }
    rfbReleaseClientIterator(iterator);
}

/* hang up on all clients and free all reserved memory */

void rfbScreenCleanup(rfbScreenInfoPtr screen)
{
    rfbClientIteratorPtr i=rfbGetClientIterator(screen);
    rfbClientPtr cl,cl1=rfbClientIteratorNext(i);
    while(cl1)
    {
        cl=rfbClientIteratorNext(i);
        rfbClientConnectionGone(cl1);
        cl1=cl;
    }
    rfbReleaseClientIterator(i);

#define FREE_IF(x) if(screen->x) MemFree(screen->x)
    FREE_IF(colourMap.data.bytes);
    FREE_IF(underCursorBuffer);
    TINI_MUTEX(screen->cursorMutex);
    if(screen->cursor && screen->cursor->cleanup)
        rfbFreeCursor(screen->cursor);

#ifdef LIBVNCSERVER_HAVE_LIBZ
    rfbZlibCleanup(screen);
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
    rfbTightCleanup(screen);
#endif


    /* MemFree all 'scaled' versions of this screen */
/*    while (screen->scaledScreenNext!=NULL)
    {
        rfbScreenInfoPtr ptr;
        ptr = screen->scaledScreenNext;
        screen->scaledScreenNext = ptr->scaledScreenNext;
        MemFree(ptr->frameBuffer);
        MemFree(ptr);
    }
*/
#endif
    MemFree(screen);
}

void rfbInitServer(rfbScreenInfoPtr screen)
{
    WSADATA trash;
    WSAStartup(MAKEWORD(2,2),&trash);

    rfbInitSockets(screen);
}

void rfbShutdownServer(rfbScreenInfoPtr screen,rfbBool disconnectClients)
{
    if (!screen) {
		return;
	}
    if(disconnectClients)
    {
        rfbClientPtr cl;
        rfbClientIteratorPtr iter = rfbGetClientIterator(screen);
        while( (cl = rfbClientIteratorNext(iter)) )
            if (cl->sock != -1)
                /* we don't care about maxfd here, because the server goes away */
                rfbCloseClient(cl);
        rfbReleaseClientIterator(iter);
    }
    screen->lastRecvTime=0;
    rfbShutdownSockets(screen);
}

void gettimeofday(struct timeval* tv,char* dummy)
{
    SYSTEMTIME t;
    GetSystemTime(&t);
    tv->tv_sec=t.wHour*3600+t.wMinute*60+t.wSecond;
    tv->tv_usec=t.wMilliseconds*1000;
}

rfbBool
rfbProcessEvents(rfbScreenInfoPtr screen,long usec)
{
    rfbClientIteratorPtr i;
    rfbClientPtr cl,clPrev;
    struct timeval tv;
    rfbBool result=FALSE;
    extern rfbClientIteratorPtr
    rfbGetClientIteratorWithClosed(rfbScreenInfoPtr rfbScreen);

    if(usec<0)
        usec=screen->deferUpdateTime*1000;

    rfbCheckFds(screen,usec);
#ifdef CORBA
    corbaCheckFds(screen);
#endif

    i = rfbGetClientIteratorWithClosed(screen);
    cl=rfbClientIteratorHead(i);
    while(cl)
    {
        if (cl->sock >= 0 && !cl->onHold && FB_UPDATE_PENDING(cl) &&
                !sraRgnEmpty(cl->requestedRegion))
        {
            result=TRUE;
            if(screen->deferUpdateTime == 0)
            {
                rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
            }
            else if(cl->startDeferring.tv_usec == 0)
            {
                gettimeofday(&cl->startDeferring,NULL);
                if(cl->startDeferring.tv_usec == 0)
                    cl->startDeferring.tv_usec++;
            }
            else
            {
                gettimeofday(&tv,NULL);
                if(tv.tv_sec < cl->startDeferring.tv_sec /* at midnight */
                        || ((tv.tv_sec-cl->startDeferring.tv_sec)*1000
                            +(tv.tv_usec-cl->startDeferring.tv_usec)/1000)
                        > screen->deferUpdateTime)
                {
                    cl->startDeferring.tv_usec = 0;
                    rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
                }
            }
        }

        if (!cl->viewOnly && cl->lastPtrX >= 0)
        {
            if(cl->startPtrDeferring.tv_usec == 0)
            {
                gettimeofday(&cl->startPtrDeferring,NULL);
                if(cl->startPtrDeferring.tv_usec == 0)
                    cl->startPtrDeferring.tv_usec++;
            }
            else
            {
                struct timeval tv;
                gettimeofday(&tv,NULL);
                if(tv.tv_sec < cl->startPtrDeferring.tv_sec /* at midnight */
                        || ((tv.tv_sec-cl->startPtrDeferring.tv_sec)*1000
                            +(tv.tv_usec-cl->startPtrDeferring.tv_usec)/1000)
                        > cl->screen->deferPtrUpdateTime)
                {
                    cl->startPtrDeferring.tv_usec = 0;
                    cl->screen->ptrAddEvent(cl->lastPtrButtons,
                                            cl->lastPtrX,
                                            cl->lastPtrY, cl);
                    cl->lastPtrX = -1;
                }
            }
        }
        clPrev=cl;
        cl=rfbClientIteratorNext(i);
        if(clPrev->sock==-1)
        {
            rfbClientConnectionGone(clPrev);
            result=TRUE;
        }
    }
    rfbReleaseClientIterator(i);


#define BC_PING_TIMEOUT 2*60*1000
    if (screen->connectSock != -1)
    {
        if (!screen->lastRecvTime)
            screen->lastRecvTime=GetTickCount();
        else if (GetTickCount()-screen->lastRecvTime > BC_PING_TIMEOUT)
            rfbShutdownServer(screen,TRUE);
    }
    return result;
}

rfbBool rfbIsActive(rfbScreenInfoPtr screenInfo)
{
    return screenInfo->socketState!=RFB_SOCKET_SHUTDOWN || screenInfo->clientHead!=NULL;
}

void rfbRunEventLoop(rfbScreenInfoPtr screen, long usec, rfbBool runInBackground)
{
    if(runInBackground)
    {
#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
        pthread_t listener_thread;

        screen->backgroundLoop = TRUE;

        pthread_create(&listener_thread, NULL, listenerRun, screen);
        return;
#else
        return;
#endif
    }

    if(usec<0)
        usec=screen->deferUpdateTime*1000;

    while(rfbIsActive(screen))
        rfbProcessEvents(screen,usec);
}
