X-Git-Url: https://git.sesse.net/?p=rdpsrv;a=blobdiff_plain;f=Xserver%2Fprograms%2FXserver%2Fdix%2Fresource.c;fp=Xserver%2Fprograms%2FXserver%2Fdix%2Fresource.c;h=ba925f6486553fd1a033d8e423cb4815dbf8e592;hp=0000000000000000000000000000000000000000;hb=b6e6afccf37f4ad0515ef2a698f714fdf1bf23b3;hpb=e3340a110a3b01756b8e67531395a33b40a17d37

diff --git a/Xserver/programs/Xserver/dix/resource.c b/Xserver/programs/Xserver/dix/resource.c
new file mode 100644
index 0000000..ba925f6
--- /dev/null
+++ b/Xserver/programs/Xserver/dix/resource.c
@@ -0,0 +1,871 @@
+/************************************************************
+
+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: resource.c /main/39 1996/10/30 11:17:56 rws $ */
+/* $XFree86: xc/programs/Xserver/dix/resource.c,v 3.1 1996/12/23 06:29:51 dawes Exp $ */
+
+/*	Routines to manage various kinds of resources:
+ *
+ *	CreateNewResourceType, CreateNewResourceClass, InitClientResources,
+ *	FakeClientID, AddResource, FreeResource, FreeClientResources,
+ *	FreeAllResources, LookupIDByType, LookupIDByClass, GetXIDRange
+ */
+
+/* 
+ *      A resource ID is a 32 bit quantity, the upper 3 bits of which are
+ *	off-limits for client-visible resources.  The next 7 bits are
+ *      used as client ID, and the low 22 bits come from the client.
+ *	A resource ID is "hashed" by extracting and xoring subfields
+ *      (varying with the size of the hash table).
+ *
+ *      It is sometimes necessary for the server to create an ID that looks
+ *      like it belongs to a client.  This ID, however,  must not be one
+ *      the client actually can create, or we have the potential for conflict.
+ *      The 30th bit of the ID is reserved for the server's use for this
+ *      purpose.  By setting CLIENT_ID(id) to the client, the SERVER_BIT to
+ *      1, and an otherwise arbitrary ID in the low 22 bits, we can create a
+ *      resource "owned" by the client.
+ */
+
+#define NEED_EVENTS
+#include "X.h"
+#include "misc.h"
+#include "os.h"
+#include "resource.h"
+#include "dixstruct.h" 
+#include "opaque.h"
+#include "windowstr.h"
+#include "inputstr.h"
+#include "dixfont.h"
+#include "dixevents.h"
+#include "dixgrabs.h"
+#include "colormap.h"
+#include "cursor.h"
+#include <assert.h>
+
+extern WindowPtr *WindowTable;
+
+static void RebuildTable(
+#if NeedFunctionPrototypes
+    int /*client*/
+#endif
+);
+
+#define SERVER_MINID 32
+
+#define INITBUCKETS 64
+#define INITHASHSIZE 6
+#define MAXHASHSIZE 11
+
+typedef struct _Resource {
+    struct _Resource	*next;
+    XID			id;
+    RESTYPE		type;
+    pointer		value;
+} ResourceRec, *ResourcePtr;
+#define NullResource ((ResourcePtr)NULL)
+
+typedef struct _ClientResource {
+    ResourcePtr *resources;
+    int		elements;
+    int		buckets;
+    int		hashsize;	/* log(2)(buckets) */
+    XID		fakeID;
+    XID		endFakeID;
+    XID		expectID;
+} ClientResourceRec;
+
+static RESTYPE lastResourceType;
+static RESTYPE lastResourceClass;
+static RESTYPE TypeMask;
+
+static DeleteType *DeleteFuncs = (DeleteType *)NULL;
+
+RESTYPE
+CreateNewResourceType(deleteFunc)
+    DeleteType deleteFunc;
+{
+    RESTYPE next = lastResourceType + 1;
+    DeleteType *funcs;
+
+    if (next & lastResourceClass)
+	return 0;
+    funcs = (DeleteType *)xrealloc(DeleteFuncs,
+				   (next + 1) * sizeof(DeleteType));
+    if (!funcs)
+	return 0;
+    lastResourceType = next;
+    DeleteFuncs = funcs;
+    DeleteFuncs[next] = deleteFunc;
+    return next;
+}
+
+RESTYPE
+CreateNewResourceClass()
+{
+    RESTYPE next = lastResourceClass >> 1;
+
+    if (next & lastResourceType)
+	return 0;
+    lastResourceClass = next;
+    TypeMask = next - 1;
+    return next;
+}
+
+ClientResourceRec clientTable[MAXCLIENTS];
+
+/*****************
+ * InitClientResources
+ *    When a new client is created, call this to allocate space
+ *    in resource table
+ *****************/
+
+Bool
+InitClientResources(client)
+    ClientPtr client;
+{
+    register int i, j;
+ 
+    if (client == serverClient)
+    {
+	lastResourceType = RT_LASTPREDEF;
+	lastResourceClass = RC_LASTPREDEF;
+	TypeMask = RC_LASTPREDEF - 1;
+	if (DeleteFuncs)
+	    xfree(DeleteFuncs);
+	DeleteFuncs = (DeleteType *)xalloc((lastResourceType + 1) *
+					   sizeof(DeleteType));
+	if (!DeleteFuncs)
+	    return FALSE;
+	DeleteFuncs[RT_NONE & TypeMask] = (DeleteType)NoopDDA;
+	DeleteFuncs[RT_WINDOW & TypeMask] = DeleteWindow;
+	DeleteFuncs[RT_PIXMAP & TypeMask] = dixDestroyPixmap;
+	DeleteFuncs[RT_GC & TypeMask] = FreeGC;
+	DeleteFuncs[RT_FONT & TypeMask] = CloseFont;
+	DeleteFuncs[RT_CURSOR & TypeMask] = FreeCursor;
+	DeleteFuncs[RT_COLORMAP & TypeMask] = FreeColormap;
+	DeleteFuncs[RT_CMAPENTRY & TypeMask] = FreeClientPixels;
+	DeleteFuncs[RT_OTHERCLIENT & TypeMask] = OtherClientGone;
+	DeleteFuncs[RT_PASSIVEGRAB & TypeMask] = DeletePassiveGrab;
+    }
+    clientTable[i = client->index].resources =
+	(ResourcePtr *)xalloc(INITBUCKETS*sizeof(ResourcePtr));
+    if (!clientTable[i].resources)
+	return FALSE;
+    clientTable[i].buckets = INITBUCKETS;
+    clientTable[i].elements = 0;
+    clientTable[i].hashsize = INITHASHSIZE;
+    /* Many IDs allocated from the server client are visible to clients,
+     * so we don't use the SERVER_BIT for them, but we have to start
+     * past the magic value constants used in the protocol.  For normal
+     * clients, we can start from zero, with SERVER_BIT set.
+     */
+    clientTable[i].fakeID = client->clientAsMask |
+			    (client->index ? SERVER_BIT : SERVER_MINID);
+    clientTable[i].endFakeID = (clientTable[i].fakeID | RESOURCE_ID_MASK) + 1;
+    clientTable[i].expectID = client->clientAsMask;
+    for (j=0; j<INITBUCKETS; j++) 
+    {
+        clientTable[i].resources[j] = NullResource;
+    }
+    return TRUE;
+}
+
+static int
+#if NeedFunctionPrototypes
+Hash(int client, register XID id)
+#else
+Hash(client, id)
+    int client;
+    register XID id;
+#endif
+{
+    id &= RESOURCE_ID_MASK;
+    switch (clientTable[client].hashsize)
+    {
+	case 6:
+	    return ((int)(0x03F & (id ^ (id>>6) ^ (id>>12))));
+	case 7:
+	    return ((int)(0x07F & (id ^ (id>>7) ^ (id>>13))));
+	case 8:
+	    return ((int)(0x0FF & (id ^ (id>>8) ^ (id>>16))));
+	case 9:
+	    return ((int)(0x1FF & (id ^ (id>>9))));
+	case 10:
+	    return ((int)(0x3FF & (id ^ (id>>10))));
+	case 11:
+	    return ((int)(0x7FF & (id ^ (id>>11))));
+    }
+    return -1;
+}
+
+static XID
+#if NeedFunctionPrototypes
+AvailableID(
+    register int client,
+    register XID id,
+    register XID maxid,
+    register XID goodid)
+#else
+AvailableID(client, id, maxid, goodid)
+    register int client;
+    register XID id, maxid, goodid;
+#endif
+{
+    register ResourcePtr res;
+
+    if ((goodid >= id) && (goodid <= maxid))
+	return goodid;
+    for (; id <= maxid; id++)
+    {
+	res = clientTable[client].resources[Hash(client, id)];
+	while (res && (res->id != id))
+	    res = res->next;
+	if (!res)
+	    return id;
+    }
+    return 0;
+}
+
+void
+GetXIDRange(client, server, minp, maxp)
+    int client;
+    Bool server;
+    XID *minp, *maxp;
+{
+    register XID id, maxid;
+    register ResourcePtr *resp;
+    register ResourcePtr res;
+    register int i;
+    XID goodid;
+
+    id = (Mask)client << CLIENTOFFSET;
+    if (server)
+	id |= client ? SERVER_BIT : SERVER_MINID;
+    maxid = id | RESOURCE_ID_MASK;
+    goodid = 0;
+    for (resp = clientTable[client].resources, i = clientTable[client].buckets;
+	 --i >= 0;)
+    {
+	for (res = *resp++; res; res = res->next)
+	{
+	    if ((res->id < id) || (res->id > maxid))
+		continue;
+	    if (((res->id - id) >= (maxid - res->id)) ?
+		(goodid = AvailableID(client, id, res->id - 1, goodid)) :
+		!(goodid = AvailableID(client, res->id + 1, maxid, goodid)))
+		maxid = res->id - 1;
+	    else
+		id = res->id + 1;
+	}
+    }
+    if (id > maxid)
+	id = maxid = 0;
+    *minp = id;
+    *maxp = maxid;
+}
+
+/*  GetXIDList is called by the XC-MISC extension's MiscGetXIDList function.
+ *  This function tries to find count unused XIDs for the given client.  It 
+ *  puts the IDs in the array pids and returns the number found, which should
+ *  almost always be the number requested.
+ *
+ *  The circumstances that lead to a call to this function are very rare.
+ *  Xlib must run out of IDs while trying to generate a request that wants
+ *  multiple ID's, like the Multi-buffering CreateImageBuffers request.
+ *
+ *  No rocket science in the implementation; just iterate over all
+ *  possible IDs for the given client and pick the first count IDs
+ *  that aren't in use.  A more efficient algorithm could probably be
+ *  invented, but this will be used so rarely that this should suffice.
+ */
+
+unsigned int
+GetXIDList(pClient, count, pids)
+    ClientPtr pClient;
+    unsigned int count;
+    XID *pids;
+{
+    unsigned int found = 0;
+    XID id = pClient->clientAsMask;
+    XID maxid;
+
+    maxid = id | RESOURCE_ID_MASK;
+    while ( (found < count) && (id <= maxid) )
+    {
+	if (!LookupIDByClass(id, RC_ANY))
+	{
+	    pids[found++] = id;
+	}
+	id++;
+    }
+    return found;
+}
+
+/*
+ * Return the next usable fake client ID.
+ *
+ * Normally this is just the next one in line, but if we've used the last
+ * in the range, we need to find a new range of safe IDs to avoid
+ * over-running another client.
+ */
+
+XID
+FakeClientID(client)
+    register int client;
+{
+    XID id, maxid;
+
+    id = clientTable[client].fakeID++;
+    if (id != clientTable[client].endFakeID)
+	return id;
+    GetXIDRange(client, TRUE, &id, &maxid);
+    if (!id) {
+	if (!client)
+	    FatalError("FakeClientID: server internal ids exhausted\n");
+	MarkClientException(clients[client]);
+	id = ((Mask)client << CLIENTOFFSET) | (SERVER_BIT * 3);
+	maxid = id | RESOURCE_ID_MASK;
+    }
+    clientTable[client].fakeID = id + 1;
+    clientTable[client].endFakeID = maxid + 1;
+    return id;
+}
+
+Bool
+AddResource(id, type, value)
+    XID id;
+    RESTYPE type;
+    pointer value;
+{
+    int client;
+    register ClientResourceRec *rrec;
+    register ResourcePtr res, *head;
+    	
+    client = CLIENT_ID(id);
+    rrec = &clientTable[client];
+    if (!rrec->buckets)
+    {
+	ErrorF("AddResource(%x, %x, %x), client=%d \n",
+		id, type, (unsigned long)value, client);
+        FatalError("client not in use\n");
+    }
+    if ((rrec->elements >= 4*rrec->buckets) &&
+	(rrec->hashsize < MAXHASHSIZE))
+	RebuildTable(client);
+    head = &rrec->resources[Hash(client, id)];
+    res = (ResourcePtr)xalloc(sizeof(ResourceRec));
+    if (!res)
+    {
+	(*DeleteFuncs[type & TypeMask])(value, id);
+	return FALSE;
+    }
+    res->next = *head;
+    res->id = id;
+    res->type = type;
+    res->value = value;
+    *head = res;
+    rrec->elements++;
+    if (!(id & SERVER_BIT) && (id >= rrec->expectID))
+	rrec->expectID = id + 1;
+    return TRUE;
+}
+
+static void
+RebuildTable(client)
+    int client;
+{
+    register int j;
+    register ResourcePtr res, next;
+    ResourcePtr **tails, *resources;
+    register ResourcePtr **tptr, *rptr;
+
+    /*
+     * For now, preserve insertion order, since some ddx layers depend
+     * on resources being free in the opposite order they are added.
+     */
+
+    j = 2 * clientTable[client].buckets;
+    tails = (ResourcePtr **)ALLOCATE_LOCAL(j * sizeof(ResourcePtr *));
+    if (!tails)
+	return;
+    resources = (ResourcePtr *)xalloc(j * sizeof(ResourcePtr));
+    if (!resources)
+    {
+	DEALLOCATE_LOCAL(tails);
+	return;
+    }
+    for (rptr = resources, tptr = tails; --j >= 0; rptr++, tptr++)
+    {
+	*rptr = NullResource;
+	*tptr = rptr;
+    }
+    clientTable[client].hashsize++;
+    for (j = clientTable[client].buckets,
+	 rptr = clientTable[client].resources;
+	 --j >= 0;
+	 rptr++)
+    {
+	for (res = *rptr; res; res = next)
+	{
+	    next = res->next;
+	    res->next = NullResource;
+	    tptr = &tails[Hash(client, res->id)];
+	    **tptr = res;
+	    *tptr = &res->next;
+	}
+    }
+    DEALLOCATE_LOCAL(tails);
+    clientTable[client].buckets *= 2;
+    xfree(clientTable[client].resources);
+    clientTable[client].resources = resources;
+}
+
+void
+FreeResource(id, skipDeleteFuncType)
+    XID id;
+    RESTYPE skipDeleteFuncType;
+{
+    int		cid;
+    register    ResourcePtr res;
+    register	ResourcePtr *prev, *head;
+    register	int *eltptr;
+    int		elements;
+    Bool	gotOne = FALSE;
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) && clientTable[cid].buckets)
+    {
+	head = &clientTable[cid].resources[Hash(cid, id)];
+	eltptr = &clientTable[cid].elements;
+
+	prev = head;
+	while ( (res = *prev) )
+	{
+	    if (res->id == id)
+	    {
+		RESTYPE rtype = res->type;
+		*prev = res->next;
+		elements = --*eltptr;
+		if (rtype & RC_CACHED)
+		    FlushClientCaches(res->id);
+		if (rtype != skipDeleteFuncType)
+		    (*DeleteFuncs[rtype & TypeMask])(res->value, res->id);
+		xfree(res);
+		if (*eltptr != elements)
+		    prev = head; /* prev may no longer be valid */
+		gotOne = TRUE;
+	    }
+	    else
+		prev = &res->next;
+        }
+	if(clients[cid] && (id == clients[cid]->lastDrawableID))
+	{
+	    clients[cid]->lastDrawable = (DrawablePtr)WindowTable[0];
+	    clients[cid]->lastDrawableID = WindowTable[0]->drawable.id;
+	}
+    }
+    if (!gotOne)
+	FatalError("Freeing resource id=%X which isn't there", id);
+}
+
+
+void
+FreeResourceByType(id, type, skipFree)
+    XID id;
+    RESTYPE type;
+    Bool    skipFree;
+{
+    int		cid;
+    register    ResourcePtr res;
+    register	ResourcePtr *prev, *head;
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) && clientTable[cid].buckets)
+    {
+	head = &clientTable[cid].resources[Hash(cid, id)];
+
+	prev = head;
+	while ( (res = *prev) )
+	{
+	    if (res->id == id && res->type == type)
+	    {
+		*prev = res->next;
+		if (type & RC_CACHED)
+		    FlushClientCaches(res->id);
+		if (!skipFree)
+		    (*DeleteFuncs[type & TypeMask])(res->value, res->id);
+		xfree(res);
+		break;
+	    }
+	    else
+		prev = &res->next;
+        }
+	if(clients[cid] && (id == clients[cid]->lastDrawableID))
+	{
+	    clients[cid]->lastDrawable = (DrawablePtr)WindowTable[0];
+	    clients[cid]->lastDrawableID = WindowTable[0]->drawable.id;
+	}
+    }
+}
+
+/*
+ * Change the value associated with a resource id.  Caller
+ * is responsible for "doing the right thing" with the old
+ * data
+ */
+
+Bool
+ChangeResourceValue (id, rtype, value)
+    XID	id;
+    RESTYPE rtype;
+    pointer value;
+{
+    int    cid;
+    register    ResourcePtr res;
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) && clientTable[cid].buckets)
+    {
+	res = clientTable[cid].resources[Hash(cid, id)];
+
+	for (; res; res = res->next)
+	    if ((res->id == id) && (res->type == rtype))
+	    {
+		if (rtype & RC_CACHED)
+		    FlushClientCaches(res->id);
+		res->value = value;
+		return TRUE;
+	    }
+    }
+    return FALSE;
+}
+
+/* Note: if func adds or deletes resources, then func can get called
+ * more than once for some resources.  If func adds new resources,
+ * func might or might not get called for them.  func cannot both
+ * add and delete an equal number of resources!
+ */
+
+void
+FindClientResourcesByType(client, type, func, cdata)
+    ClientPtr client;
+    RESTYPE type;
+    FindResType func;
+    pointer cdata;
+{
+    register ResourcePtr *resources;
+    register ResourcePtr this, next;
+    int i, elements;
+    register int *eltptr;
+
+    if (!client)
+	client = serverClient;
+
+    resources = clientTable[client->index].resources;
+    eltptr = &clientTable[client->index].elements;
+    for (i = 0; i < clientTable[client->index].buckets; i++) 
+    {
+        for (this = resources[i]; this; this = next)
+	{
+	    next = this->next;
+	    if (!type || this->type == type) {
+		elements = *eltptr;
+		(*func)(this->value, this->id, cdata);
+		if (*eltptr != elements)
+		    next = resources[i]; /* start over */
+	    }
+	}
+    }
+}
+
+void
+FreeClientNeverRetainResources(client)
+    ClientPtr client;
+{
+    ResourcePtr *resources;
+    ResourcePtr this;
+    ResourcePtr *prev;
+    int j;
+
+    if (!client)
+	return;
+
+    resources = clientTable[client->index].resources;
+    for (j=0; j < clientTable[client->index].buckets; j++) 
+    {
+	prev = &resources[j];
+        while ( (this = *prev) )
+	{
+	    RESTYPE rtype = this->type;
+	    if (rtype & RC_NEVERRETAIN)
+	    {
+		*prev = this->next;
+		if (rtype & RC_CACHED)
+		    FlushClientCaches(this->id);
+		(*DeleteFuncs[rtype & TypeMask])(this->value, this->id);
+		xfree(this);	    
+	    }
+	    else
+		prev = &this->next;
+	}
+    }
+}
+
+void
+FreeClientResources(client)
+    ClientPtr client;
+{
+    register ResourcePtr *resources;
+    register ResourcePtr this;
+    int j;
+
+    /* This routine shouldn't be called with a null client, but just in
+	case ... */
+
+    if (!client)
+	return;
+
+    HandleSaveSet(client);
+
+    resources = clientTable[client->index].resources;
+    for (j=0; j < clientTable[client->index].buckets; j++) 
+    {
+        /* It may seem silly to update the head of this resource list as
+	we delete the members, since the entire list will be deleted any way, 
+	but there are some resource deletion functions "FreeClientPixels" for 
+	one which do a LookupID on another resource id (a Colormap id in this
+	case), so the resource list must be kept valid up to the point that
+	it is deleted, so every time we delete a resource, we must update the
+	head, just like in FreeResource. I hope that this doesn't slow down
+	mass deletion appreciably. PRH */
+
+	ResourcePtr *head;
+
+	head = &resources[j];
+
+        for (this = *head; this; this = *head)
+	{
+	    RESTYPE rtype = this->type;
+	    *head = this->next;
+	    if (rtype & RC_CACHED)
+		FlushClientCaches(this->id);
+	    (*DeleteFuncs[rtype & TypeMask])(this->value, this->id);
+	    xfree(this);	    
+	}
+    }
+    xfree(clientTable[client->index].resources);
+    clientTable[client->index].buckets = 0;
+}
+
+void
+FreeAllResources()
+{
+    int	i;
+
+    for (i = currentMaxClients; --i >= 0; ) 
+    {
+        if (clientTable[i].buckets) 
+	    FreeClientResources(clients[i]);
+    }
+}
+
+Bool
+LegalNewID(id, client)
+    XID id;
+    register ClientPtr client;
+{
+    return ((client->clientAsMask == (id & ~RESOURCE_ID_MASK)) &&
+	    ((clientTable[client->index].expectID <= id) ||
+	     !LookupIDByClass(id, RC_ANY)));
+}
+
+#ifdef XCSECURITY
+
+/* SecurityLookupIDByType and SecurityLookupIDByClass:
+ * These are the heart of the resource ID security system.  They take
+ * two additional arguments compared to the old LookupID functions:
+ * the client doing the lookup, and the access mode (see resource.h).
+ * The resource is returned if it exists and the client is allowed access,
+ * else NULL is returned.
+ */
+
+pointer
+SecurityLookupIDByType(client, id, rtype, mode)
+    ClientPtr client;
+    XID id;
+    RESTYPE rtype;
+    Mask mode;
+{
+    int    cid;
+    register    ResourcePtr res;
+    pointer retval = NULL;
+
+    assert(client == NullClient ||
+     (client->index <= currentMaxClients && clients[client->index] == client));
+    assert( (rtype & TypeMask) <= lastResourceType);
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) &&
+	clientTable[cid].buckets)
+    {
+	res = clientTable[cid].resources[Hash(cid, id)];
+
+	for (; res; res = res->next)
+	    if ((res->id == id) && (res->type == rtype))
+	    {
+		retval = res->value;
+		break;
+	    }
+    }
+    if (retval && client && client->CheckAccess)
+	retval = (* client->CheckAccess)(client, id, rtype, mode, retval);
+    return retval;
+}
+
+
+pointer
+SecurityLookupIDByClass(client, id, classes, mode)
+    ClientPtr client;
+    XID id;
+    RESTYPE classes;
+    Mask mode;
+{
+    int    cid;
+    register    ResourcePtr res;
+    pointer retval = NULL;
+
+    assert(client == NullClient ||
+     (client->index <= currentMaxClients && clients[client->index] == client));
+    assert (classes >= lastResourceClass);
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) &&
+	clientTable[cid].buckets)
+    {
+	res = clientTable[cid].resources[Hash(cid, id)];
+
+	for (; res; res = res->next)
+	    if ((res->id == id) && (res->type & classes))
+	    {
+		retval = res->value;
+		break;
+	    }
+    }
+    if (retval && client && client->CheckAccess)
+	retval = (* client->CheckAccess)(client, id, classes, mode, retval);
+    return retval;
+}
+
+/* We can't replace the LookupIDByType and LookupIDByClass functions with
+ * macros because of compatibility with loadable servers.
+ */
+
+pointer
+LookupIDByType(id, rtype)
+    XID id;
+    RESTYPE rtype;
+{
+    return SecurityLookupIDByType(NullClient, id, rtype,
+				  SecurityUnknownAccess);
+}
+
+pointer
+LookupIDByClass(id, classes)
+    XID id;
+    RESTYPE classes;
+{
+    return SecurityLookupIDByClass(NullClient, id, classes,
+				   SecurityUnknownAccess);
+}
+
+#else /* not XCSECURITY */
+
+/*
+ *  LookupIDByType returns the object with the given id and type, else NULL.
+ */ 
+pointer
+LookupIDByType(id, rtype)
+    XID id;
+    RESTYPE rtype;
+{
+    int    cid;
+    register    ResourcePtr res;
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) &&
+	clientTable[cid].buckets)
+    {
+	res = clientTable[cid].resources[Hash(cid, id)];
+
+	for (; res; res = res->next)
+	    if ((res->id == id) && (res->type == rtype))
+		return res->value;
+    }
+    return (pointer)NULL;
+}
+
+/*
+ *  LookupIDByClass returns the object with the given id and any one of the
+ *  given classes, else NULL.
+ */ 
+pointer
+LookupIDByClass(id, classes)
+    XID id;
+    RESTYPE classes;
+{
+    int    cid;
+    register    ResourcePtr res;
+
+    if (((cid = CLIENT_ID(id)) < MAXCLIENTS) &&
+	clientTable[cid].buckets)
+    {
+	res = clientTable[cid].resources[Hash(cid, id)];
+
+	for (; res; res = res->next)
+	    if ((res->id == id) && (res->type & classes))
+		return res->value;
+    }
+    return (pointer)NULL;
+}
+
+#endif /* XCSECURITY */