path: root/nx-X11/programs/Xserver/hw/nxagent/NXresource.c

/**************************************************************************/
/*                                                                        */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com)          */
/* Copyright (c) 2008-2017 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>  */
/* Copyright (c) 2011-2022 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2014-2019 Mihai Moldovan <ionic@ionic.de>                */
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/* $TOG: resource.c /main/41 1998/02/09 14:20:31 kaleb $ */

/*	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 2 bits of which are
 *	off-limits for client-visible resources.  The next 8 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 31st 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.
 */

#include "../../dix/resource.c"

#include "Agent.h"
#include "Font.h"
#include "Pixmaps.h"
#include "GCs.h"

#define PANIC
#define WARNING
#undef  TEST
#undef  DEBUG

#ifdef NXAGENT_SERVER
static int nxagentResChangedFlag = 0;
#endif

#ifdef NXAGENT_SERVER
Bool nxagentFindClientResource(int client, RESTYPE type, void * value)
{
  for (int i = 0; i < clientTable[client].buckets; i++)
  {
    ResourcePtr *resources = clientTable[client].resources;

    for (ResourcePtr pResource = resources[i]; pResource; pResource = pResource -> next)
    {
      if (pResource -> type == type && pResource -> value == value)
      {
        #ifdef TEST
        fprintf(stderr, "nxagentFindClientResource: Found resource [%p] type [%lu] "
                    "for client [%d].\n", (void *) value,
                        pResource -> type, client);
        #endif

        return True;
      }
    }
  }

  return False;
}

static Bool nxagentSwitchResourceType(int client, RESTYPE type, void * value)
{
  RESTYPE internalType = 0;

  if (type == RT_PIXMAP)
  {
    internalType = RT_NX_PIXMAP;
  }
  else if (type == RT_GC)
  {
    internalType = RT_NX_GC;
  }
  else if (type == RT_FONT)
  {
    internalType = RT_NX_FONT;
  }
  else
  {
    return False;
  }

  if (client == serverClient -> index)
  {
    #ifdef TEST
    fprintf(stderr, "nxagentSwitchResourceType: Requesting client is [%d]. Skipping the resource switch.\n",
                client);
    #endif

    return False;
  }

  for (int i = 0; i < clientTable[serverClient -> index].buckets; i++)
  {
    ResourcePtr *resources = clientTable[serverClient -> index].resources;

    for (ResourcePtr pResource = resources[i]; pResource; pResource = pResource -> next)
    {
      if (pResource -> type == internalType &&
              pResource -> value == value)
      {
        #ifdef TEST
        fprintf(stderr, "nxagentSwitchResourceType: Changing resource [%p] type from [%lu] to "
                    "[%lu] for server client [%d].\n", (void *) value,
                        (unsigned long) pResource -> type, (unsigned long) type, serverClient -> index);
        #endif

        FreeResource(pResource -> id, RT_NONE);

        return True;
      }
    }
  }

  return False;
}
#endif /* NXAGENT_SERVER */

Bool
AddResource(XID id, RESTYPE type, void * value)
{
    int client;
    register ClientResourceRec *rrec;
    register ResourcePtr res, *head;

    client = CLIENT_ID(id);
    rrec = &clientTable[client];
    if (!rrec->buckets)
    {
	ErrorF("AddResource(%lx, %lx, %lx), client=%d \n",
		(unsigned long)id, type, (unsigned long)value, client);
        FatalError("client not in use\n");
    }

#ifdef NXAGENT_SERVER
    nxagentSwitchResourceType(client, type, value);

    #ifdef TEST
    fprintf(stderr, "AddResource: Adding resource for client [%d] type [%lu] value [%p] id [%lu].\n",
                client, (unsigned long) type, (void *) value, (unsigned long) id);
    #endif
#endif

    if ((rrec->elements >= 4*rrec->buckets) &&
	(rrec->hashsize < MAXHASHSIZE))
	RebuildTable(client);
    head = &rrec->resources[Hash(client, id)];
    res = (ResourcePtr)malloc(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++;
#ifdef NXAGENT_SERVER
    nxagentResChangedFlag = 1;
#endif
    if (!(id & SERVER_BIT) && (id >= rrec->expectID))
	rrec->expectID = id + 1;
    return TRUE;
}

void
FreeResource(XID id, RESTYPE skipDeleteFuncType)
{
    int		cid;
    register    ResourcePtr res;
    register	ResourcePtr *prev, *head;
    register	int *eltptr;
    int		elements = 0;
    Bool	gotOne = FALSE;

#ifdef NXAGENT_SERVER
    #ifdef TEST
    fprintf(stderr, "FreeResource: Freeing resource id [%lu].\n", (unsigned long) id);
    #endif
#endif

    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;
#ifdef NXAGENT_SERVER
                nxagentResChangedFlag = 1;
#endif
		if (rtype != skipDeleteFuncType)
		    (*DeleteFuncs[rtype & TypeMask])(res->value, res->id);
		free(res);
		if (*eltptr != elements)
		    prev = head; /* prev may no longer be valid */
		gotOne = TRUE;
	    }
	    else
		prev = &res->next;
        }
    }
    if (!gotOne)
	ErrorF("Freeing resource id=%lX which isn't there.\n",
		   (unsigned long)id);
}


void
FreeResourceByType(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;
#ifdef NXAGENT_SERVER
                nxagentResChangedFlag = 1;
#endif
		if (!skipFree)
		    (*DeleteFuncs[type & TypeMask])(res->value, res->id);
		free(res);
		break;
	    }
	    else
		prev = &res->next;
        }
    }
}

/* 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(
    ClientPtr client,
    RESTYPE type,
    FindResType func,
    void * cdata
){
    register ResourcePtr *resources;
    register ResourcePtr this, next;
    int i, elements;
    register int *eltptr;

    if (!client)
	client = serverClient;

#ifdef NXAGENT_SERVER
/*
 * If func triggers a resource table
 * rebuild then restart the loop.
 */
register ResourcePtr **resptr;

RestartLoop:
    resptr = &clientTable[client->index].resources;
#endif

    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;

#ifdef NXAGENT_SERVER
                /*
                 * FIXME:
                 * It is not safe to let a function change the resource
                 * table we are reading!
                 */
                nxagentResChangedFlag = 0;
#endif
		(*func)(this->value, this->id, cdata);
#ifdef NXAGENT_SERVER
                /*
                 * Avoid that a call to RebuildTable() could invalidate the
                 * pointer. This is safe enough, because in RebuildTable()
                 * the new pointer is allocated just before the old one is
                 * freed, so it can't point to the same address.
                 */

                if (*resptr != resources)
                   goto RestartLoop;

                /*
                 * It's not enough to check if the number of elements has
                 * changed, because it could happen that the number of
                 * resources that have been added matches the number of
                 * the freed ones.
                 * 'nxagentResChangedFlag' is set if a resource has been
                 * added or freed.
                 */

                if (*eltptr != elements || nxagentResChangedFlag)
#else
		if (*eltptr != elements)
#endif
		    next = resources[i]; /* start over */
	    }
	}
    }
}

void
FindAllClientResources(
    ClientPtr client,
    FindAllRes func,
    void * cdata
){
    register ResourcePtr *resources;
    register ResourcePtr this, next;
    int i, elements;
    register int *eltptr;

    if (!client)
        client = serverClient;

#ifdef NXAGENT_SERVER
/*
 * If func triggers a resource table
 * rebuild then restart the loop.
 */
register ResourcePtr **resptr;

RestartLoop:
    resptr = &clientTable[client->index].resources;
#endif

    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;
            elements = *eltptr;

#ifdef NXAGENT_SERVER
            /*
             * FIXME:
             * It is not safe to let a function change the resource
             * table we are reading!
             */

            nxagentResChangedFlag = 0;
#endif
            (*func)(this->value, this->id, this->type, cdata);

#ifdef NXAGENT_SERVER
            /*
             * Avoid that a call to RebuildTable() could invalidate the
             * pointer. This is safe enough, because in RebuildTable()
             * the new pointer is allocated just before the old one is
             * freed, so it can't point to the same address.
             */

            if (*resptr != resources)
                goto RestartLoop;

            /*
             * It's not enough to check if the number of elements has
             * changed, because it could happen that the number of
             * resources that have been added matches the number of
             * the freed ones.
             * 'nxagentResChangedFlag' is set if a resource has been
             * added or freed.
             */

            if (*eltptr != elements || nxagentResChangedFlag)
#else
            if (*eltptr != elements)
#endif
                next = resources[i]; /* start over */
        }
    }
}


void *
LookupClientResourceComplex(
    ClientPtr client,
    RESTYPE type,
    FindComplexResType func,
    void * cdata
){
    ResourcePtr *resources;
    ResourcePtr this;
    int i;

    if (!client)
	client = serverClient;

#ifdef NXAGENT_SERVER
/*
 * If func triggers a resource table
 * rebuild then restart the loop.
 */
ResourcePtr **resptr;

RestartLoop:
    resptr = &clientTable[client->index].resources;
#endif

    resources = clientTable[client->index].resources;
    for (i = 0; i < clientTable[client->index].buckets; i++) {
        for (this = resources[i]; this; this = this->next) {
	    if (!type || this->type == type) {
#ifdef NXAGENT_SERVER
                Bool res = (*func)(this->value, this->id, cdata);

                if (*resptr != resources)
                    goto RestartLoop;

                if (res)
                    return this->value;
#else
		if((*func)(this->value, this->id, cdata))
		    return this->value;
#endif
	    }
	}
    }
    return NULL;
}