property.c

远程桌面连接工具

/***********************************************************

Copyright (c) 1987  X Consortium

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
X CONSORTIUM 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.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/
/* $XConsortium: property.c /main/41 1996/12/22 12:33:58 rws $ */
/* $XFree86: xc/programs/Xserver/dix/property.c,v 3.5 1996/12/24 11:52:04 dawes Exp $ */

#include "X.h"
#define NEED_REPLIES
#define NEED_EVENTS
#include "Xproto.h"
#include "windowstr.h"
#include "propertyst.h"
#include "dixstruct.h"
#include "dispatch.h"
#include "swaprep.h"
#ifdef XCSECURITY
#define _SECURITY_SERVER
#include "extensions/security.h"
#endif

#if defined(LBX) || defined(LBX_COMPAT)
int fWriteToClient(client, len, buf)
    ClientPtr   client;
    int         len;
    char        *buf;
{
    return WriteToClient(client, len, buf);
}
#endif

/*****************************************************************
 * Property Stuff
 *
 *    ChangeProperty, DeleteProperty, GetProperties,
 *    ListProperties
 *
 *   Properties below to windows.  A allocate slots each time
 *   a property is added.  No fancy searching done.
 *
 *****************************************************************/

#ifdef notdef
static void
PrintPropertys(pWin)
    WindowPtr pWin;
{
    PropertyPtr pProp;
    register int j;

    pProp = pWin->userProps;
    while (pProp)
    {
        ErrorF(  "%x %x\n", pProp->propertyName, pProp->type);
        ErrorF("property format: %d\n", pProp->format);
        ErrorF("property data: \n");
        for (j=0; j<(pProp->format/8)*pProp->size; j++)
           ErrorF("%c\n", pProp->data[j]);
        pProp = pProp->next;
    }
}
#endif

int
ProcRotateProperties(client)
    ClientPtr client;
{
    int     i, j, delta;
    REQUEST(xRotatePropertiesReq);
    WindowPtr pWin;
    register    Atom * atoms;
    PropertyPtr * props;               /* array of pointer */
    PropertyPtr pProp;
    xEvent event;

    REQUEST_FIXED_SIZE(xRotatePropertiesReq, stuff->nAtoms << 2);
    UpdateCurrentTime();
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
					    SecurityWriteAccess);
    if (!pWin)
        return(BadWindow);
    if (!stuff->nAtoms)
	return(Success);
    atoms = (Atom *) & stuff[1];
    props = (PropertyPtr *)ALLOCATE_LOCAL(stuff->nAtoms * sizeof(PropertyPtr));
    if (!props)
	return(BadAlloc);
    for (i = 0; i < stuff->nAtoms; i++)
    {
#ifdef XCSECURITY
	char action = SecurityCheckPropertyAccess(client, pWin, atoms[i],
				SecurityReadAccess|SecurityWriteAccess);
#endif
        if (!ValidAtom(atoms[i])
#ifdef XCSECURITY
	    || (SecurityErrorOperation == action)
#endif
	   )
        {
            DEALLOCATE_LOCAL(props);
	    client->errorValue = atoms[i];
            return BadAtom;
        }
#ifdef XCSECURITY
	if (SecurityIgnoreOperation == action)
        {
            DEALLOCATE_LOCAL(props);
	    return Success;
	}
#endif
        for (j = i + 1; j < stuff->nAtoms; j++)
            if (atoms[j] == atoms[i])
            {
                DEALLOCATE_LOCAL(props);
                return BadMatch;
            }
        pProp = wUserProps (pWin);
        while (pProp)
        {
            if (pProp->propertyName == atoms[i])
                goto found;
	    pProp = pProp->next;
        }
        DEALLOCATE_LOCAL(props);
        return BadMatch;
found: 
        props[i] = pProp;
    }
    delta = stuff->nPositions;

    /* If the rotation is a complete 360 degrees, then moving the properties
	around and generating PropertyNotify events should be skipped. */

    if ( (stuff->nAtoms != 0) && (abs(delta) % stuff->nAtoms) != 0 ) 
    {
	while (delta < 0)                  /* faster if abs value is small */
            delta += stuff->nAtoms;
    	for (i = 0; i < stuff->nAtoms; i++)
 	{
	    /* Generate a PropertyNotify event for each property whose value
		is changed in the order in which they appear in the request. */
 
 	    event.u.u.type = PropertyNotify;
            event.u.property.window = pWin->drawable.id;
    	    event.u.property.state = PropertyNewValue;
	    event.u.property.atom = props[i]->propertyName;	
	    event.u.property.time = currentTime.milliseconds;
	    DeliverEvents(pWin, &event, 1, (WindowPtr)NULL);
	
            props[i]->propertyName = atoms[(i + delta) % stuff->nAtoms];
	}
    }
    DEALLOCATE_LOCAL(props);
    return Success;
}

int 
ProcChangeProperty(client)
    ClientPtr client;
{	      
    WindowPtr pWin;
    char format, mode;
    unsigned long len;
    int sizeInBytes;
    int totalSize;
    int err;
    REQUEST(xChangePropertyReq);

    REQUEST_AT_LEAST_SIZE(xChangePropertyReq);
    UpdateCurrentTime();
    format = stuff->format;
    mode = stuff->mode;
    if ((mode != PropModeReplace) && (mode != PropModeAppend) &&
	(mode != PropModePrepend))
    {
	client->errorValue = mode;
	return BadValue;
    }
    if ((format != 8) && (format != 16) && (format != 32))
    {
	client->errorValue = format;
        return BadValue;
    }
    len = stuff->nUnits;
    if (len > ((0xffffffff - sizeof(xChangePropertyReq)) >> 2))
	return BadLength;
    sizeInBytes = format>>3;
    totalSize = len * sizeInBytes;
    REQUEST_FIXED_SIZE(xChangePropertyReq, totalSize);

    pWin = (WindowPtr)SecurityLookupWindow(stuff->window, client,
					   SecurityWriteAccess);
    if (!pWin)
	return(BadWindow);
    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return(BadAtom);
    }
    if (!ValidAtom(stuff->type))
    {
	client->errorValue = stuff->type;
	return(BadAtom);
    }

#ifdef XCSECURITY
    switch (SecurityCheckPropertyAccess(client, pWin, stuff->property,
					SecurityWriteAccess))
    {
	case SecurityErrorOperation:
	    client->errorValue = stuff->property;
	    return BadAtom;
	case SecurityIgnoreOperation:
	    return Success;
    }
#endif

#ifdef LBX
    err = LbxChangeWindowProperty(client, pWin, stuff->property, stuff->type,
	 (int)format, (int)mode, len, TRUE, (pointer)&stuff[1], TRUE, NULL);
#else
    err = ChangeWindowProperty(pWin, stuff->property, stuff->type, (int)format,
			       (int)mode, len, (pointer)&stuff[1], TRUE);
#endif
    if (err != Success)
	return err;
    else
	return client->noClientException;
}

int
ChangeWindowProperty(pWin, property, type, format, mode, len, value, sendevent)
    WindowPtr	pWin;
    Atom	property, type;
    int		format, mode;
    unsigned long len;
    pointer	value;
    Bool	sendevent;
{
#ifdef LBX
    return LbxChangeWindowProperty(NULL, pWin, property, type,
				   format, mode, len, TRUE, value,
				   sendevent, NULL);
#else
    PropertyPtr pProp;
    xEvent event;
    int sizeInBytes;
    int totalSize;
    pointer data;

    sizeInBytes = format>>3;
    totalSize = len * sizeInBytes;

    /* first see if property already exists */

    pProp = wUserProps (pWin);
    while (pProp)
    {
	if (pProp->propertyName == property)
	    break;
	pProp = pProp->next;
    }
    if (!pProp)   /* just add to list */
    {
	if (!pWin->optional && !MakeWindowOptional (pWin))
	    return(BadAlloc);
        pProp = (PropertyPtr)xalloc(sizeof(PropertyRec));
	if (!pProp)
	    return(BadAlloc);
        data = (pointer)xalloc(totalSize);
	if (!data && len)
	{
	    xfree(pProp);
	    return(BadAlloc);
	}
        pProp->propertyName = property;
        pProp->type = type;
        pProp->format = format;
        pProp->data = data;
	if (len)
	    memmove((char *)data, (char *)value, totalSize);
	pProp->size = len;
        pProp->next = pWin->optional->userProps;
        pWin->optional->userProps = pProp;
    }
    else
    {
	/* To append or prepend to a property the request format and type
		must match those of the already defined property.  The
		existing format and type are irrelevant when using the mode
		"PropModeReplace" since they will be written over. */

        if ((format != pProp->format) && (mode != PropModeReplace))
	    return(BadMatch);
        if ((pProp->type != type) && (mode != PropModeReplace))
            return(BadMatch);
        if (mode == PropModeReplace)
        {
	    if (totalSize != pProp->size * (pProp->format >> 3))
	    {
	    	data = (pointer)xrealloc(pProp->data, totalSize);
	    	if (!data && len)
		    return(BadAlloc);
            	pProp->data = data;
	    }
	    if (len)
		memmove((char *)pProp->data, (char *)value, totalSize);
	    pProp->size = len;
    	    pProp->type = type;
	    pProp->format = format;
	}
	else if (len == 0)
	{
	    /* do nothing */
	}
        else if (mode == PropModeAppend)
        {
	    data = (pointer)xrealloc(pProp->data,
				     sizeInBytes * (len + pProp->size));
	    if (!data)
		return(BadAlloc);
            pProp->data = data;
	    memmove(&((char *)data)[pProp->size * sizeInBytes], 
		    (char *)value,
		  totalSize);
            pProp->size += len;
	}
        else if (mode == PropModePrepend)
        {