264 lines
8.5 KiB
C
264 lines
8.5 KiB
C
/*
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* Implementation of the StdGlobalInterfaceTable object
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*
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* The GlobalInterfaceTable (GIT) object is used to marshal interfaces between
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* threading apartments (contexts). When you want to pass an interface but not
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* as a parameter, it wouldn't get marshalled automatically, so you can use this
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* object to insert the interface into a table, and you get back a cookie.
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* Then when it's retrieved, it'll be unmarshalled into the right apartment.
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*
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* Copyright 2003 Mike Hearn <mike@theoretic.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "windef.h"
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#include "objbase.h"
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#include "ole2.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "winternl.h"
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#include "compobj_private.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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/****************************************************************************
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* StdGlobalInterfaceTable definition
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*
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* This class implements IGlobalInterfaceTable and is a process-wide singleton
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* used for marshalling interfaces between threading apartments using cookies.
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*/
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/* Each entry in the linked list of GIT entries */
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typedef struct StdGITEntry
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{
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DWORD cookie;
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IID iid; /* IID of the interface */
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IStream* stream; /* Holds the marshalled interface */
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struct StdGITEntry* next;
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struct StdGITEntry* prev;
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} StdGITEntry;
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/* Class data */
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typedef struct StdGlobalInterfaceTableImpl
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{
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ICOM_VFIELD(IGlobalInterfaceTable);
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ULONG ref;
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struct StdGITEntry* firstEntry;
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struct StdGITEntry* lastEntry;
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ULONG nextCookie;
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} StdGlobalInterfaceTableImpl;
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/* IUnknown */
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static HRESULT WINAPI StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface, REFIID riid, void** ppvObject);
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static ULONG WINAPI StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface);
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static ULONG WINAPI StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface);
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/* IGlobalInterfaceTable */
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static HRESULT WINAPI StdGlobalInterfaceTable_RegisterInterfaceInGlobal(IGlobalInterfaceTable* iface, IUnknown* pUnk, REFIID riid, DWORD* pdwCookie);
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static HRESULT WINAPI StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(IGlobalInterfaceTable* iface, DWORD dwCookie);
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static HRESULT WINAPI StdGlobalInterfaceTable_GetInterfaceFromGlobal(IGlobalInterfaceTable* iface, DWORD dwCookie, REFIID riid, void **ppv);
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/* Virtual function table */
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static ICOM_VTABLE(IGlobalInterfaceTable) StdGlobalInterfaceTableImpl_Vtbl =
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{
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ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
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StdGlobalInterfaceTable_QueryInterface,
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StdGlobalInterfaceTable_AddRef,
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StdGlobalInterfaceTable_Release,
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StdGlobalInterfaceTable_RegisterInterfaceInGlobal,
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StdGlobalInterfaceTable_RevokeInterfaceFromGlobal,
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StdGlobalInterfaceTable_GetInterfaceFromGlobal
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};
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/***
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* Let's go! Here is the constructor and destructor for the class.
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*
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*/
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/** This function constructs the GIT. It should only be called once **/
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void* StdGlobalInterfaceTable_Construct() {
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StdGlobalInterfaceTableImpl* newGIT;
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newGIT = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGlobalInterfaceTableImpl));
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if (newGIT == 0) return newGIT;
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ICOM_VTBL(newGIT) = &StdGlobalInterfaceTableImpl_Vtbl;
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newGIT->ref = 0; /* Initialise the reference count */
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newGIT->firstEntry = NULL; /* we start with an empty table */
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newGIT->lastEntry = NULL;
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newGIT->nextCookie = 0xf100; /* that's where windows starts, so that's where we start */
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TRACE("Created the GIT at %p\n", newGIT);
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return (void*)newGIT;
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}
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/** This destroys it again. It should revoke all the held interfaces first **/
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void StdGlobalInterfaceTable_Destroy(void* self) {
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TRACE("(%p)\n", self);
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FIXME("Revoke held interfaces here\n");
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HeapFree(GetProcessHeap(), 0, self);
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}
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/***
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* A helper function to traverse the list and find the entry that matches the cookie.
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* Returns NULL if not found
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*/
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StdGITEntry* StdGlobalInterfaceTable_FindEntry(IGlobalInterfaceTable* iface, DWORD cookie) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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StdGITEntry* e;
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TRACE("iface=%p, cookie=0x%x\n", iface, (UINT)cookie);
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e = self->firstEntry;
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while (e != NULL) {
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if (e->cookie == cookie) return e;
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e = e->next;
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}
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return NULL;
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}
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/***
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* Here's the boring boilerplate stuff for IUnknown
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*/
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HRESULT WINAPI StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface, REFIID riid, void** ppvObject) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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/* Make sure silly coders can't crash us */
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if (ppvObject == 0) return E_INVALIDARG;
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*ppvObject = 0; /* assume we don't have the interface */
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/* Do we implement that interface? */
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if (IsEqualIID(&IID_IUnknown, riid)) {
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*ppvObject = (IGlobalInterfaceTable*) self;
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} else if (IsEqualIID(&IID_IGlobalInterfaceTable, riid)) {
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*ppvObject = (IGlobalInterfaceTable*) self;
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} else return E_NOINTERFACE;
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/* Now inc the refcount */
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/* we don't use refcounts for now: StdGlobalInterfaceTable_AddRef(iface); */
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return S_OK;
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}
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ULONG WINAPI StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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self->ref++;
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return self->ref;
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}
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ULONG WINAPI StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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self->ref--;
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if (self->ref == 0) {
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/* Hey ho, it's time to go, so long again 'till next weeks show! */
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StdGlobalInterfaceTable_Destroy(self);
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return 0;
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}
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return self->ref;
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}
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/***
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* Now implement the actual IGlobalInterfaceTable interface
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*/
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HRESULT WINAPI StdGlobalInterfaceTable_RegisterInterfaceInGlobal(IGlobalInterfaceTable* iface, IUnknown* pUnk, REFIID riid, DWORD* pdwCookie) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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IStream* stream = NULL;
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HRESULT hres;
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StdGITEntry* entry;
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TRACE("iface=%p, pUnk=%p, riid=%s, pdwCookie=%p\n", iface, pUnk, debugstr_guid(riid), pdwCookie);
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if (pUnk == NULL) return E_INVALIDARG;
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/* marshal the interface */
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hres = CoMarshalInterThreadInterfaceInStream(riid, pUnk, &stream);
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if (hres) return hres;
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entry = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGITEntry));
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if (entry == NULL) return E_OUTOFMEMORY;
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entry->iid = *riid;
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entry->stream = stream;
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entry->cookie = self->nextCookie;
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self->nextCookie++; /* inc the cookie count */
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/* insert the new entry at the end of the list */
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entry->next = NULL;
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entry->prev = self->lastEntry;
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if (entry->prev) entry->prev->next = entry;
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else self->firstEntry = entry;
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self->lastEntry = entry;
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/* and return the cookie */
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*pdwCookie = entry->cookie;
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return S_OK;
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}
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HRESULT WINAPI StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(IGlobalInterfaceTable* iface, DWORD dwCookie) {
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StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
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StdGITEntry* entry;
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TRACE("iface=%p, dwCookie=0x%x\n", iface, (UINT)dwCookie);
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entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
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if (entry == NULL) {
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TRACE("Entry not found\n");
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return E_INVALIDARG; /* not found */
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}
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/* chop entry out of the list, and free the memory */
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if (entry->prev) entry->prev->next = entry->next;
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else self->firstEntry = entry->next;
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if (entry->next) entry->next->prev = entry->prev;
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else self->lastEntry = entry->prev;
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HeapFree(GetProcessHeap(), 0, entry);
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return S_OK;
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}
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HRESULT WINAPI StdGlobalInterfaceTable_GetInterfaceFromGlobal(IGlobalInterfaceTable* iface, DWORD dwCookie, REFIID riid, void **ppv) {
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StdGITEntry* entry;
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HRESULT hres;
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entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
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if (entry == NULL) return E_INVALIDARG;
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if (!IsEqualIID(&entry->iid, &riid)) return E_INVALIDARG;
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/* unmarshal the interface */
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hres = CoGetInterfaceAndReleaseStream(entry->stream, riid, *ppv);
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if (hres) return hres;
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return S_OK;
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}
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