dist/dix/property.c

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

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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 Open Group 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 Open Group.


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.

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

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <X11/X.h>
#define NEED_REPLIES
#define NEED_EVENTS
#include <X11/Xproto.h>
#include "windowstr.h"
#include "propertyst.h"
#include "dixstruct.h"
#include "dispatch.h"
#include "swaprep.h"
#include "xace.h"

/*****************************************************************
 * 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(WindowPtr pWin)
{
    PropertyPtr pProp;
    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

static void
deliverPropertyNotifyEvent(WindowPtr pWin, int state, Atom atom)
{
    xEvent event;

    event.u.u.type = PropertyNotify;
    event.u.property.window = pWin->drawable.id;
    event.u.property.state = state;
    event.u.property.atom = atom;
    event.u.property.time = currentTime.milliseconds;
    DeliverEvents(pWin, &event, 1, (WindowPtr)NULL);
}

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

    REQUEST_FIXED_SIZE(xRotatePropertiesReq, stuff->nAtoms << 2);
    UpdateCurrentTime();
    rc = dixLookupWindow(&pWin, stuff->window, client, DixWriteAccess);
    if (rc != Success)
        return rc;
    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++)
    {
	char action = XaceHook(XACE_PROPERTY_ACCESS, client, pWin, atoms[i],
				DixReadAccess|DixWriteAccess);

        if (!ValidAtom(atoms[i]) || (XaceErrorOperation == action)) {
            DEALLOCATE_LOCAL(props);
	    client->errorValue = atoms[i];
            return BadAtom;
        }
	if (XaceIgnoreOperation == action) {
            DEALLOCATE_LOCAL(props);
	    return Success;
	}

        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++)
 	{
	    deliverPropertyNotifyEvent(pWin, PropertyNewValue,
				       props[i]->propertyName);

            props[i]->propertyName = atoms[(i + delta) % stuff->nAtoms];
	}
    }
    DEALLOCATE_LOCAL(props);
    return Success;
}

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

    err = dixLookupWindow(&pWin, stuff->window, client, DixWriteAccess);
    if (err != Success)
	return err;
    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return(BadAtom);
    }
    if (!ValidAtom(stuff->type))
    {
	client->errorValue = stuff->type;
	return(BadAtom);
    }

    switch (XaceHook(XACE_PROPERTY_ACCESS, client, pWin, stuff->property,
		     DixWriteAccess))
    {
    case XaceErrorOperation:
	client->errorValue = stuff->property;
	return BadAtom;
    case XaceIgnoreOperation:
	return Success;
    }

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

_X_EXPORT int
ChangeWindowProperty(WindowPtr pWin, Atom property, Atom type, int format,
                     int mode, unsigned long len, pointer value,
                     Bool sendevent)
{
    PropertyPtr pProp;
    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)
        {
            data = (pointer)xalloc(sizeInBytes * (len + pProp->size));
	    if (!data)
		return(BadAlloc);
	    memmove(&((char *)data)[totalSize], (char *)pProp->data,
		  (int)(pProp->size * sizeInBytes));
            memmove((char *)data, (char *)value, totalSize);
	    xfree(pProp->data);
            pProp->data = data;
            pProp->size += len;
	}
    }

    if (sendevent)
	deliverPropertyNotifyEvent(pWin, PropertyNewValue, pProp->propertyName);

    return(Success);
}

int
DeleteProperty(WindowPtr pWin, Atom propName)
{
    PropertyPtr pProp, prevProp;

    if (!(pProp = wUserProps (pWin)))
	return(Success);
    prevProp = (PropertyPtr)NULL;
    while (pProp)
    {
	if (pProp->propertyName == propName)
	    break;
        prevProp = pProp;
	pProp = pProp->next;
    }
    if (pProp)
    {
        if (prevProp == (PropertyPtr)NULL)      /* takes care of head */
        {
            if (!(pWin->optional->userProps = pProp->next))
		CheckWindowOptionalNeed (pWin);
        }
	else
        {
            prevProp->next = pProp->next;
        }
	deliverPropertyNotifyEvent(pWin, PropertyDelete, pProp->propertyName);
	xfree(pProp->data);
        xfree(pProp);
    }
    return(Success);
}

void
DeleteAllWindowProperties(WindowPtr pWin)
{
    PropertyPtr pProp, pNextProp;

    pProp = wUserProps (pWin);
    while (pProp)
    {
	deliverPropertyNotifyEvent(pWin, PropertyDelete, pProp->propertyName);
	pNextProp = pProp->next;
        xfree(pProp->data);
        xfree(pProp);
	pProp = pNextProp;
    }
}

static int
NullPropertyReply(
    ClientPtr client,
    ATOM propertyType,
    int format,
    xGetPropertyReply *reply)
{
    reply->nItems = 0;
    reply->length = 0;
    reply->bytesAfter = 0;
    reply->propertyType = propertyType;
    reply->format = format;
    WriteReplyToClient(client, sizeof(xGenericReply), reply);
    return(client->noClientException);
}

/*****************
 * GetProperty
 *    If type Any is specified, returns the property from the specified
 *    window regardless of its type.  If a type is specified, returns the
 *    property only if its type equals the specified type.
 *    If delete is True and a property is returned, the property is also
 *    deleted from the window and a PropertyNotify event is generated on the
 *    window.
 *****************/

int
ProcGetProperty(ClientPtr client)
{
    PropertyPtr pProp, prevProp;
    unsigned long n, len, ind, rc;
    WindowPtr pWin;
    xGetPropertyReply reply;
    Mask access_mode = DixReadAccess;
    REQUEST(xGetPropertyReq);

    REQUEST_SIZE_MATCH(xGetPropertyReq);
    if (stuff->delete)
	UpdateCurrentTime();
    rc = dixLookupWindow(&pWin, stuff->window, client, DixReadAccess);
    if (rc != Success)
	return rc;

    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return(BadAtom);
    }
    if ((stuff->delete != xTrue) && (stuff->delete != xFalse))
    {
	client->errorValue = stuff->delete;
	return(BadValue);
    }
    if ((stuff->type != AnyPropertyType) && !ValidAtom(stuff->type))
    {
	client->errorValue = stuff->type;
	return(BadAtom);
    }

    pProp = wUserProps (pWin);
    prevProp = (PropertyPtr)NULL;
    while (pProp)
    {
	if (pProp->propertyName == stuff->property)
	    break;
	prevProp = pProp;
	pProp = pProp->next;
    }

    reply.type = X_Reply;
    reply.sequenceNumber = client->sequence;
    if (!pProp)
	return NullPropertyReply(client, None, 0, &reply);

    if (stuff->delete)
	access_mode |= DixDestroyAccess;
    switch (XaceHook(XACE_PROPERTY_ACCESS, client, pWin, stuff->property,
		     access_mode))
    {
    case XaceErrorOperation:
	client->errorValue = stuff->property;
	return BadAtom;;
    case XaceIgnoreOperation:
	return NullPropertyReply(client, pProp->type, pProp->format, &reply);
    }

    /* If the request type and actual type don't match. Return the
    property information, but not the data. */

    if (((stuff->type != pProp->type) &&
	 (stuff->type != AnyPropertyType))
       )
    {
	reply.bytesAfter = pProp->size;
	reply.format = pProp->format;
	reply.length = 0;
	reply.nItems = 0;
	reply.propertyType = pProp->type;
	WriteReplyToClient(client, sizeof(xGenericReply), &reply);
	return(Success);
    }

/*
 *  Return type, format, value to client
 */
    n = (pProp->format/8) * pProp->size; /* size (bytes) of prop */
    ind = stuff->longOffset << 2;

   /* If longOffset is invalid such that it causes "len" to
	    be negative, it's a value error. */

    if (n < ind)
    {
	client->errorValue = stuff->longOffset;
	return BadValue;
    }

    len = min(n - ind, 4 * stuff->longLength);

    reply.bytesAfter = n - (ind + len);
    reply.format = pProp->format;
    reply.length = (len + 3) >> 2;
    reply.nItems = len / (pProp->format / 8 );
    reply.propertyType = pProp->type;

    if (stuff->delete && (reply.bytesAfter == 0))
	deliverPropertyNotifyEvent(pWin, PropertyDelete, pProp->propertyName);

    WriteReplyToClient(client, sizeof(xGenericReply), &reply);
    if (len)
    {
	switch (reply.format) {
	case 32: client->pSwapReplyFunc = (ReplySwapPtr)CopySwap32Write; break;
	case 16: client->pSwapReplyFunc = (ReplySwapPtr)CopySwap16Write; break;
	default: client->pSwapReplyFunc = (ReplySwapPtr)WriteToClient; break;
	}
	WriteSwappedDataToClient(client, len,
				 (char *)pProp->data + ind);
    }

    if (stuff->delete && (reply.bytesAfter == 0))
    { /* delete the Property */
	if (prevProp == (PropertyPtr)NULL) /* takes care of head */
	{
	    if (!(pWin->optional->userProps = pProp->next))
		CheckWindowOptionalNeed (pWin);
	}
	else
	    prevProp->next = pProp->next;
	xfree(pProp->data);
	xfree(pProp);
    }
    return(client->noClientException);
}

int
ProcListProperties(ClientPtr client)
{
    Atom *pAtoms = NULL, *temppAtoms;
    xListPropertiesReply xlpr;
    int	rc, numProps = 0;
    WindowPtr pWin;
    PropertyPtr pProp;
    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixReadAccess);
    if (rc != Success)
        return rc;

    pProp = wUserProps (pWin);
    while (pProp)
    {
        pProp = pProp->next;
	numProps++;
    }
    if (numProps)
        if(!(pAtoms = (Atom *)ALLOCATE_LOCAL(numProps * sizeof(Atom))))
            return(BadAlloc);

    xlpr.type = X_Reply;
    xlpr.nProperties = numProps;
    xlpr.length = (numProps * sizeof(Atom)) >> 2;
    xlpr.sequenceNumber = client->sequence;
    pProp = wUserProps (pWin);
    temppAtoms = pAtoms;
    while (pProp)
    {
	*temppAtoms++ = pProp->propertyName;
	pProp = pProp->next;
    }
    WriteReplyToClient(client, sizeof(xGenericReply), &xlpr);
    if (numProps)
    {
        client->pSwapReplyFunc = (ReplySwapPtr)Swap32Write;
        WriteSwappedDataToClient(client, numProps * sizeof(Atom), pAtoms);
        DEALLOCATE_LOCAL(pAtoms);
    }
    return(client->noClientException);
}

int
ProcDeleteProperty(ClientPtr client)
{
    WindowPtr pWin;
    REQUEST(xDeletePropertyReq);
    int result;

    REQUEST_SIZE_MATCH(xDeletePropertyReq);
    UpdateCurrentTime();
    result = dixLookupWindow(&pWin, stuff->window, client, DixWriteAccess);
    if (result != Success)
        return result;
    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return (BadAtom);
    }

    switch (XaceHook(XACE_PROPERTY_ACCESS, client, pWin, stuff->property,
		     DixDestroyAccess))
    {
    case XaceErrorOperation:
	client->errorValue = stuff->property;
	return BadAtom;;
    case XaceIgnoreOperation:
	return Success;
    }

    result = DeleteProperty(pWin, stuff->property);
    if (client->noClientException != Success)
	return(client->noClientException);
    else
	return(result);
}