dlls/dispex/usrmarshal.c

   1 /*
   2  *    Misc marshaling routines
   3  *
   4  * Copyright 2010 Huw Davies
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20 #include <stdarg.h>
  21 #include <string.h>
  22
  23 #define COBJMACROS
  24 #define NONAMELESSUNION
  25 #define NONAMELESSSTRUCT
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "wingdi.h"
  30 #include "winuser.h"
  31 #include "winerror.h"
  32 #include "objbase.h"
  33 #include "oleauto.h"
  34 #include "dispex.h"
  35
  36 #include "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  39
  40 #define NULL_RESULT    0x20000
  41 #define NULL_EXCEPINFO 0x40000
  42
  43 HRESULT CALLBACK IDispatchEx_InvokeEx_Proxy(IDispatchEx* This, DISPID id, LCID lcid, WORD wFlags,
  44                                             DISPPARAMS *pdp, VARIANT *pvarRes, EXCEPINFO *pei,
  45                                             IServiceProvider *pspCaller)
  46 {
  47     HRESULT hr;
  48     VARIANT result;
  49     EXCEPINFO excep_info;
  50     UINT byref_args, arg, dummy_idx;
  51     VARIANT dummy_arg, *ref_arg = &dummy_arg, *copy_arg, *orig_arg = NULL;
  52     UINT *ref_idx = &dummy_idx;
  53     DWORD dword_flags = wFlags & 0xf;
  54
  55     TRACE("(%p)->(%08x, %04x, %04x, %p, %p, %p, %p)\n", This, id, lcid, wFlags,
  56           pdp, pvarRes, pei, pspCaller);
  57
  58     if(!pvarRes)
  59     {
  60         pvarRes = &result;
  61         dword_flags |= NULL_RESULT;
  62     }
  63
  64     if(!pei)
  65     {
  66         pei = &excep_info;
  67         dword_flags |= NULL_EXCEPINFO;
  68     }
  69
  70     for(arg = 0, byref_args = 0; arg < pdp->cArgs; arg++)
  71         if(V_ISBYREF(pdp->rgvarg + arg)) byref_args++;
  72
  73     if(byref_args)
  74     {
  75         DWORD size = pdp->cArgs * sizeof(VARIANT) +
  76             byref_args * (sizeof(VARIANT) + sizeof(UINT));
  77
  78         copy_arg = CoTaskMemAlloc(size);
  79         if(!copy_arg) return E_OUTOFMEMORY;
  80
  81         ref_arg = copy_arg + pdp->cArgs;
  82         ref_idx = (UINT*)(ref_arg + byref_args);
  83
  84         /* copy the byref args to ref_arg[], the others go to copy_arg[] */
  85         for(arg = 0, byref_args = 0; arg < pdp->cArgs; arg++)
  86         {
  87             if(V_ISBYREF(pdp->rgvarg + arg))
  88             {
  89                 ref_arg[byref_args] = pdp->rgvarg[arg];
  90                 ref_idx[byref_args] = arg;
  91                 VariantInit(copy_arg + arg);
  92                 byref_args++;
  93             }
  94             else
  95                 copy_arg[arg] = pdp->rgvarg[arg];
  96         }
  97
  98         orig_arg = pdp->rgvarg;
  99         pdp->rgvarg = copy_arg;
 100     }
 101
 102     hr = IDispatchEx_RemoteInvokeEx_Proxy(This, id, lcid, dword_flags, pdp, pvarRes, pei, pspCaller,
 103                                           byref_args, ref_idx, ref_arg);
 104
 105     if(byref_args)
 106     {
 107         CoTaskMemFree(pdp->rgvarg);
 108         pdp->rgvarg = orig_arg;
 109     }
 110
 111     return hr;
 112 }
 113
 114 HRESULT __RPC_STUB IDispatchEx_InvokeEx_Stub(IDispatchEx* This, DISPID id, LCID lcid, DWORD dwFlags,
 115                                              DISPPARAMS *pdp, VARIANT *result, EXCEPINFO *pei,
 116                                              IServiceProvider *pspCaller, UINT byref_args,
 117                                              UINT *ref_idx, VARIANT *ref_arg)
 118 {
 119     HRESULT hr;
 120     UINT arg;
 121     VARTYPE *vt_list = NULL;
 122
 123     TRACE("(%p)->(%08x, %04x, %08x, %p, %p, %p, %p, %d, %p, %p)\n", This, id, lcid, dwFlags,
 124           pdp, result, pei, pspCaller, byref_args, ref_idx, ref_arg);
 125
 126     VariantInit(result);
 127     memset(pei, 0, sizeof(*pei));
 128
 129     for(arg = 0; arg < byref_args; arg++)
 130         pdp->rgvarg[ref_idx[arg]] = ref_arg[arg];
 131
 132     if(dwFlags & NULL_RESULT) result = NULL;
 133     if(dwFlags & NULL_EXCEPINFO) pei = NULL;
 134
 135     /* Create an array of the original VTs to check that the function doesn't change
 136        any on return. */
 137     if(byref_args)
 138     {
 139         vt_list = HeapAlloc(GetProcessHeap(), 0, pdp->cArgs * sizeof(vt_list[0]));
 140         if(!vt_list) return E_OUTOFMEMORY;
 141         for(arg = 0; arg < pdp->cArgs; arg++)
 142             vt_list[arg] = V_VT(pdp->rgvarg + arg);
 143     }
 144
 145     hr = IDispatchEx_InvokeEx(This, id, lcid, dwFlags & 0xffff, pdp, result, pei, pspCaller);
 146
 147     if(SUCCEEDED(hr) && byref_args)
 148     {
 149         for(arg = 0; arg < pdp->cArgs; arg++)
 150         {
 151             if(vt_list[arg] != V_VT(pdp->rgvarg + arg))
 152             {
 153                 hr = DISP_E_BADCALLEE;
 154                 break;
 155             }
 156         }
 157     }
 158
 159     if(hr == DISP_E_EXCEPTION)
 160     {
 161         if(pei && pei->pfnDeferredFillIn)
 162         {
 163             pei->pfnDeferredFillIn(pei);
 164             pei->pfnDeferredFillIn = NULL;
 165         }
 166     }
 167
 168     for(arg = 0; arg < byref_args; arg++)
 169         VariantInit(pdp->rgvarg + ref_idx[arg]);
 170
 171     HeapFree(GetProcessHeap(), 0, vt_list);
 172     return hr;
 173 }