334 lines
9.4 KiB
C
334 lines
9.4 KiB
C
/*
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* COM proxy implementation
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*
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* Copyright 2001 Ove Kåven, TransGaming Technologies
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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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* TODO: Handle non-i386 architectures
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* Get rid of #if 0'ed code.
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*/
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#include <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "objbase.h"
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#include "rpcproxy.h"
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#include "cpsf.h"
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#include "ndr_misc.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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struct StublessThunk;
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/* I don't know what MS's std proxy structure looks like,
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so this probably doesn't match, but that shouldn't matter */
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typedef struct {
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IRpcProxyBufferVtbl *lpVtbl;
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LPVOID *PVtbl;
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DWORD RefCount;
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const MIDL_STUBLESS_PROXY_INFO *stubless;
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const IID* piid;
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LPUNKNOWN pUnkOuter;
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PCInterfaceName name;
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LPPSFACTORYBUFFER pPSFactory;
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LPRPCCHANNELBUFFER pChannel;
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struct StublessThunk *thunks;
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} StdProxyImpl;
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static IRpcProxyBufferVtbl StdProxy_Vtbl;
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#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
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/* How the Windows stubless proxy thunks work is explained at
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* http://msdn.microsoft.com/library/en-us/dnmsj99/html/com0199.asp,
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* but I'll use a slightly different method, to make life easier */
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#if defined(__i386__)
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#include "pshpack1.h"
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struct StublessThunk {
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BYTE push;
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DWORD index;
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BYTE call;
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LONG handler;
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BYTE ret;
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WORD bytes;
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BYTE pad[3];
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};
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#include "poppack.h"
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/* adjust the stack size since we don't use Windows's method */
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#define STACK_ADJUST sizeof(DWORD)
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#define FILL_STUBLESS(x,idx,stk) \
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x->push = 0x68; /* pushl [immediate] */ \
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x->index = (idx); \
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x->call = 0xe8; /* call [near] */ \
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x->handler = (char*)ObjectStubless - (char*)&x->ret; \
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x->ret = 0xc2; /* ret [immediate] */ \
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x->bytes = stk; \
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x->pad[0] = 0x8d; /* leal (%esi),%esi */ \
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x->pad[1] = 0x76; \
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x->pad[2] = 0x00;
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static HRESULT WINAPI ObjectStubless(DWORD index)
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{
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char *args = (char*)(&index + 2);
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LPVOID iface = *(LPVOID*)args;
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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PFORMAT_STRING fs = This->stubless->ProcFormatString + This->stubless->FormatStringOffset[index];
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unsigned bytes = *(WORD*)(fs+8) - STACK_ADJUST;
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TRACE("(%p)->(%ld)([%d bytes]) ret=%08lx\n", iface, index, bytes, *(DWORD*)(args+bytes));
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return RPCRT4_NdrClientCall2(This->stubless->pStubDesc, fs, args);
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}
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#else /* __i386__ */
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/* can't do that on this arch */
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struct StublessThunk { int dummy; };
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#define FILL_STUBLESS(x,idx,stk) \
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ERR("stubless proxies are not supported on this architecture\n");
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#define STACK_ADJUST 0
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#endif /* __i386__ */
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HRESULT WINAPI StdProxy_Construct(REFIID riid,
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LPUNKNOWN pUnkOuter,
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PCInterfaceName name,
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CInterfaceProxyVtbl *vtbl,
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CInterfaceStubVtbl *svtbl,
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LPPSFACTORYBUFFER pPSFactory,
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LPRPCPROXYBUFFER *ppProxy,
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LPVOID *ppvObj)
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{
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StdProxyImpl *This;
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const MIDL_STUBLESS_PROXY_INFO *stubless = NULL;
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TRACE("(%p,%p,%p,%p,%p) %s\n", pUnkOuter, vtbl, pPSFactory, ppProxy, ppvObj, name);
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/* I can't find any other way to detect stubless proxies than this hack */
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if (!IsEqualGUID(vtbl->header.piid, riid)) {
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stubless = *(const void **)vtbl;
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vtbl = (CInterfaceProxyVtbl *)((const void **)vtbl + 1);
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TRACE("stubless=%p\n", stubless);
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}
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TRACE("iid=%s\n", debugstr_guid(vtbl->header.piid));
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TRACE("vtbl=%p\n", vtbl->Vtbl);
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if (!IsEqualGUID(vtbl->header.piid, riid)) {
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ERR("IID mismatch during proxy creation\n");
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return RPC_E_UNEXPECTED;
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}
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This = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(StdProxyImpl));
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if (!This) return E_OUTOFMEMORY;
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if (stubless) {
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unsigned i, count = svtbl->header.DispatchTableCount;
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/* Maybe the original vtbl is just modified directly to point at
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* ObjectStublessClientXXX thunks in real Windows, but I don't like it
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*/
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TRACE("stubless thunks: count=%d\n", count);
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This->thunks = HeapAlloc(GetProcessHeap(),0,sizeof(struct StublessThunk)*count);
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This->PVtbl = HeapAlloc(GetProcessHeap(),0,sizeof(LPVOID)*count);
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for (i=0; i<count; i++) {
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struct StublessThunk *thunk = &This->thunks[i];
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if (vtbl->Vtbl[i] == (LPVOID)-1) {
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PFORMAT_STRING fs = stubless->ProcFormatString + stubless->FormatStringOffset[i];
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unsigned bytes = *(WORD*)(fs+8) - STACK_ADJUST;
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TRACE("method %d: stacksize=%d\n", i, bytes);
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FILL_STUBLESS(thunk, i, bytes)
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This->PVtbl[i] = thunk;
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}
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else {
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memset(thunk, 0, sizeof(struct StublessThunk));
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This->PVtbl[i] = vtbl->Vtbl[i];
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}
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}
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}
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else
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This->PVtbl = vtbl->Vtbl;
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This->lpVtbl = &StdProxy_Vtbl;
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/* 1 reference for the proxy and 1 for the object */
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This->RefCount = 2;
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This->stubless = stubless;
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This->piid = vtbl->header.piid;
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This->pUnkOuter = pUnkOuter;
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This->name = name;
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This->pPSFactory = pPSFactory;
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This->pChannel = NULL;
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*ppProxy = (LPRPCPROXYBUFFER)&This->lpVtbl;
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*ppvObj = &This->PVtbl;
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IPSFactoryBuffer_AddRef(pPSFactory);
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return S_OK;
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}
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static void WINAPI StdProxy_Destruct(LPRPCPROXYBUFFER iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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if (This->pChannel)
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IRpcProxyBuffer_Disconnect(iface);
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IPSFactoryBuffer_Release(This->pPSFactory);
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if (This->thunks) {
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HeapFree(GetProcessHeap(),0,This->PVtbl);
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HeapFree(GetProcessHeap(),0,This->thunks);
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}
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HeapFree(GetProcessHeap(),0,This);
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}
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static HRESULT WINAPI StdProxy_QueryInterface(LPRPCPROXYBUFFER iface,
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REFIID riid,
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LPVOID *obj)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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TRACE("(%p)->QueryInterface(%s,%p)\n",This,debugstr_guid(riid),obj);
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if (IsEqualGUID(&IID_IUnknown,riid) ||
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IsEqualGUID(This->piid,riid)) {
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*obj = &This->PVtbl;
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This->RefCount++;
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return S_OK;
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}
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if (IsEqualGUID(&IID_IRpcProxyBuffer,riid)) {
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*obj = &This->lpVtbl;
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This->RefCount++;
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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static ULONG WINAPI StdProxy_AddRef(LPRPCPROXYBUFFER iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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TRACE("(%p)->AddRef()\n",This);
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return ++(This->RefCount);
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}
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static ULONG WINAPI StdProxy_Release(LPRPCPROXYBUFFER iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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TRACE("(%p)->Release()\n",This);
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if (!--(This->RefCount)) {
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StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
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return 0;
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}
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return This->RefCount;
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}
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static HRESULT WINAPI StdProxy_Connect(LPRPCPROXYBUFFER iface,
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LPRPCCHANNELBUFFER pChannel)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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TRACE("(%p)->Connect(%p)\n",This,pChannel);
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This->pChannel = pChannel;
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IRpcChannelBuffer_AddRef(pChannel);
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return S_OK;
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}
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static VOID WINAPI StdProxy_Disconnect(LPRPCPROXYBUFFER iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
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TRACE("(%p)->Disconnect()\n",This);
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IRpcChannelBuffer_Release(This->pChannel);
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This->pChannel = NULL;
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}
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static IRpcProxyBufferVtbl StdProxy_Vtbl =
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{
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ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
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StdProxy_QueryInterface,
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StdProxy_AddRef,
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StdProxy_Release,
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StdProxy_Connect,
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StdProxy_Disconnect
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};
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HRESULT WINAPI StdProxy_GetChannel(LPVOID iface,
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LPRPCCHANNELBUFFER *ppChannel)
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{
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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TRACE("(%p)->GetChannel(%p) %s\n",This,ppChannel,This->name);
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*ppChannel = This->pChannel;
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return S_OK;
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}
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HRESULT WINAPI StdProxy_GetIID(LPVOID iface,
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const IID **ppiid)
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{
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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TRACE("(%p)->GetIID(%p) %s\n",This,ppiid,This->name);
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*ppiid = This->piid;
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return S_OK;
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}
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HRESULT WINAPI IUnknown_QueryInterface_Proxy(LPUNKNOWN iface,
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REFIID riid,
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LPVOID *ppvObj)
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{
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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TRACE("(%p)->QueryInterface(%s,%p) %s\n",This,debugstr_guid(riid),ppvObj,This->name);
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return IUnknown_QueryInterface(This->pUnkOuter,riid,ppvObj);
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}
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ULONG WINAPI IUnknown_AddRef_Proxy(LPUNKNOWN iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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TRACE("(%p)->AddRef() %s\n",This,This->name);
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#if 0 /* interface refcounting */
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return ++(This->RefCount);
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#else /* object refcounting */
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return IUnknown_AddRef(This->pUnkOuter);
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#endif
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}
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ULONG WINAPI IUnknown_Release_Proxy(LPUNKNOWN iface)
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{
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ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
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TRACE("(%p)->Release() %s\n",This,This->name);
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#if 0 /* interface refcounting */
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if (!--(This->RefCount)) {
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StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
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return 0;
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}
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return This->RefCount;
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#else /* object refcounting */
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return IUnknown_Release(This->pUnkOuter);
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#endif
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}
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