Sweden-Number/dlls/ole32/git.c

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/*
* Implementation of the StdGlobalInterfaceTable object
*
* The GlobalInterfaceTable (GIT) object is used to marshal interfaces between
* threading apartments (contexts). When you want to pass an interface but not
* as a parameter, it wouldn't get marshalled automatically, so you can use this
* object to insert the interface into a table, and you get back a cookie.
* Then when it's retrieved, it'll be unmarshalled into the right apartment.
*
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* Copyright 2003 Mike Hearn <mike@theoretic.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#define COBJMACROS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "objbase.h"
#include "ole2.h"
#include "winerror.h"
#include "compobj_private.h"
#include "wine/list.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(ole);
/****************************************************************************
* StdGlobalInterfaceTable definition
*
* This class implements IGlobalInterfaceTable and is a process-wide singleton
* used for marshalling interfaces between threading apartments using cookies.
*/
/* Each entry in the linked list of GIT entries */
typedef struct StdGITEntry
{
DWORD cookie;
IID iid; /* IID of the interface */
IStream* stream; /* Holds the marshalled interface */
struct list entry;
} StdGITEntry;
/* Class data */
typedef struct StdGlobalInterfaceTableImpl
{
IGlobalInterfaceTable IGlobalInterfaceTable_iface;
struct list list;
ULONG nextCookie;
} StdGlobalInterfaceTableImpl;
static IGlobalInterfaceTable *std_git;
static CRITICAL_SECTION git_section;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &git_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": global interface table") }
};
static CRITICAL_SECTION git_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static inline StdGlobalInterfaceTableImpl *impl_from_IGlobalInterfaceTable(IGlobalInterfaceTable *iface)
{
return CONTAINING_RECORD(iface, StdGlobalInterfaceTableImpl, IGlobalInterfaceTable_iface);
}
/***
* A helper function to traverse the list and find the entry that matches the cookie.
* Returns NULL if not found. Must be called inside git_section critical section.
*/
static StdGITEntry* StdGlobalInterfaceTable_FindEntry(StdGlobalInterfaceTableImpl* This,
DWORD cookie)
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{
StdGITEntry* e;
TRACE("%p, %#lx.\n", This, cookie);
LIST_FOR_EACH_ENTRY(e, &This->list, StdGITEntry, entry) {
if (e->cookie == cookie)
return e;
}
TRACE("Entry not found\n");
return NULL;
}
/***
* Here's the boring boilerplate stuff for IUnknown
*/
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static HRESULT WINAPI
StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface,
REFIID riid, void** ppvObject)
{
/* Make sure silly coders can't crash us */
if (ppvObject == 0) return E_INVALIDARG;
*ppvObject = 0; /* assume we don't have the interface */
/* Do we implement that interface? */
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if (IsEqualIID(&IID_IUnknown, riid) ||
IsEqualIID(&IID_IGlobalInterfaceTable, riid))
{
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*ppvObject = iface;
}
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else
{
FIXME("(%s), not supported.\n", debugstr_guid(riid));
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return E_NOINTERFACE;
}
/* Now inc the refcount */
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IGlobalInterfaceTable_AddRef(iface);
return S_OK;
}
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static ULONG WINAPI
StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface)
{
return 1;
}
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static ULONG WINAPI
StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface)
{
return 1;
}
/***
* Now implement the actual IGlobalInterfaceTable interface
*/
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static HRESULT WINAPI
StdGlobalInterfaceTable_RegisterInterfaceInGlobal(
IGlobalInterfaceTable* iface, IUnknown* pUnk,
REFIID riid, DWORD* pdwCookie)
{
StdGlobalInterfaceTableImpl* const This = impl_from_IGlobalInterfaceTable(iface);
IStream* stream = NULL;
HRESULT hres;
StdGITEntry* entry;
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LARGE_INTEGER zero;
TRACE("iface=%p, pUnk=%p, riid=%s, pdwCookie=0x%p\n", iface, pUnk, debugstr_guid(riid), pdwCookie);
if (pUnk == NULL) return E_INVALIDARG;
/* marshal the interface */
TRACE("About to marshal the interface\n");
hres = CreateStreamOnHGlobal(0, TRUE, &stream);
if (hres != S_OK) return hres;
hres = CoMarshalInterface(stream, riid, pUnk, MSHCTX_INPROC, NULL, MSHLFLAGS_TABLESTRONG);
if (hres != S_OK)
{
IStream_Release(stream);
return hres;
}
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zero.QuadPart = 0;
IStream_Seek(stream, zero, STREAM_SEEK_SET, NULL);
entry = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGITEntry));
if (!entry)
{
CoReleaseMarshalData(stream);
IStream_Release(stream);
return E_OUTOFMEMORY;
}
EnterCriticalSection(&git_section);
entry->iid = *riid;
entry->stream = stream;
entry->cookie = This->nextCookie;
This->nextCookie++; /* inc the cookie count */
/* insert the new entry at the end of the list */
list_add_tail(&This->list, &entry->entry);
/* and return the cookie */
*pdwCookie = entry->cookie;
LeaveCriticalSection(&git_section);
TRACE("Cookie is %#lx\n", entry->cookie);
return S_OK;
}
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static HRESULT WINAPI
StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(
IGlobalInterfaceTable* iface, DWORD dwCookie)
{
StdGlobalInterfaceTableImpl* This = impl_from_IGlobalInterfaceTable(iface);
StdGITEntry* entry;
HRESULT hr;
TRACE("%p, %#lx.\n", iface, dwCookie);
EnterCriticalSection(&git_section);
entry = StdGlobalInterfaceTable_FindEntry(This, dwCookie);
if (entry == NULL) {
TRACE("Entry not found\n");
LeaveCriticalSection(&git_section);
return E_INVALIDARG; /* not found */
}
list_remove(&entry->entry);
LeaveCriticalSection(&git_section);
/* Free the stream */
hr = CoReleaseMarshalData(entry->stream);
if (hr != S_OK)
{
WARN("Failed to release marshal data, hr = %#lx\n", hr);
return hr;
}
IStream_Release(entry->stream);
HeapFree(GetProcessHeap(), 0, entry);
return S_OK;
}
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static HRESULT WINAPI
StdGlobalInterfaceTable_GetInterfaceFromGlobal(
IGlobalInterfaceTable* iface, DWORD dwCookie,
REFIID riid, void **ppv)
{
StdGlobalInterfaceTableImpl* This = impl_from_IGlobalInterfaceTable(iface);
StdGITEntry* entry;
HRESULT hres;
IStream *stream;
TRACE("%#lx, %s, %p.\n", dwCookie, debugstr_guid(riid), ppv);
EnterCriticalSection(&git_section);
entry = StdGlobalInterfaceTable_FindEntry(This, dwCookie);
if (entry == NULL) {
WARN("Entry for cookie %#lx not found\n", dwCookie);
LeaveCriticalSection(&git_section);
return E_INVALIDARG;
}
TRACE("entry=%p\n", entry);
hres = IStream_Clone(entry->stream, &stream);
LeaveCriticalSection(&git_section);
if (hres != S_OK) {
WARN("Failed to clone stream with error %#lx.\n", hres);
return hres;
}
/* unmarshal the interface */
hres = CoUnmarshalInterface(stream, riid, ppv);
IStream_Release(stream);
if (hres != S_OK) {
WARN("Failed to unmarshal stream\n");
return hres;
}
TRACE("ppv=%p\n", *ppv);
return S_OK;
}
static const IGlobalInterfaceTableVtbl StdGlobalInterfaceTableImpl_Vtbl =
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{
StdGlobalInterfaceTable_QueryInterface,
StdGlobalInterfaceTable_AddRef,
StdGlobalInterfaceTable_Release,
StdGlobalInterfaceTable_RegisterInterfaceInGlobal,
StdGlobalInterfaceTable_RevokeInterfaceFromGlobal,
StdGlobalInterfaceTable_GetInterfaceFromGlobal
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};
HRESULT WINAPI GlobalInterfaceTable_CreateInstance(IClassFactory *iface, IUnknown *outer, REFIID riid, void **obj)
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{
StdGlobalInterfaceTableImpl *git;
if (!std_git)
{
git = heap_alloc(sizeof(*git));
if (!git) return E_OUTOFMEMORY;
git->IGlobalInterfaceTable_iface.lpVtbl = &StdGlobalInterfaceTableImpl_Vtbl;
list_init(&git->list);
git->nextCookie = 0xf100; /* that's where windows starts, so that's where we start */
if (InterlockedCompareExchangePointer((void **)&std_git, &git->IGlobalInterfaceTable_iface, NULL))
{
heap_free(git);
}
else
TRACE("Created the GIT %p\n", git);
}
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return IGlobalInterfaceTable_QueryInterface(std_git, riid, obj);
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}
void release_std_git(void)
{
StdGlobalInterfaceTableImpl *git;
StdGITEntry *entry, *entry2;
if (!std_git) return;
git = impl_from_IGlobalInterfaceTable(std_git);
LIST_FOR_EACH_ENTRY_SAFE(entry, entry2, &git->list, StdGITEntry, entry)
{
list_remove(&entry->entry);
CoReleaseMarshalData(entry->stream);
IStream_Release(entry->stream);
HeapFree(GetProcessHeap(), 0, entry);
}
HeapFree(GetProcessHeap(), 0, git);
}