dlls/urlmon/umstream.c

   1 /*
   2  * Based on ../shell32/memorystream.c
   3  *
   4  * Copyright 1999 Juergen Schmied
   5  * Copyright 2003 Mike McCormack for CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23
  24 #define COBJMACROS
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winreg.h"
  29 #include "winternl.h"
  30 #include "winuser.h"
  31 #include "objbase.h"
  32 #include "wine/debug.h"
  33 #include "wine/unicode.h"
  34 #include "ole2.h"
  35 #include "urlmon.h"
  36 #include "wininet.h"
  37 #include "shlwapi.h"
  38 #include "urlmon_main.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(urlmon);
  41
  42 static const IStreamVtbl stvt;
  43
  44 HRESULT UMCreateStreamOnCacheFile(LPCWSTR pszURL,
  45                                   DWORD dwSize,
  46                                   LPWSTR pszFileName,
  47                                   HANDLE *phfile,
  48                                   IUMCacheStream **ppstr)
  49 {
  50     IUMCacheStream* ucstr;
  51     HANDLE handle;
  52     DWORD size;
  53     LPWSTR url, c, ext = NULL;
  54     HRESULT hr;
  55
  56     size = (strlenW(pszURL)+1)*sizeof(WCHAR);
  57     url = heap_alloc(size);
  58     memcpy(url, pszURL, size);
  59
  60     for (c = url; *c && *c != '#' && *c != '?'; ++c)
  61     {
  62         if (*c == '.')
  63             ext = c+1;
  64         else if(*c == '/')
  65             ext = NULL;
  66     }
  67
  68     *c = 0;
  69
  70     if(!CreateUrlCacheEntryW(url, dwSize, ext, pszFileName, 0))
  71        hr = HRESULT_FROM_WIN32(GetLastError());
  72     else
  73        hr = 0;
  74
  75     heap_free(url);
  76
  77     if (hr)
  78        return hr;
  79
  80     TRACE("Opening %s\n", debugstr_w(pszFileName) );
  81
  82     handle = CreateFileW( pszFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, NULL );
  83     if( handle == INVALID_HANDLE_VALUE )
  84        return HRESULT_FROM_WIN32(GetLastError());
  85
  86     if (phfile)
  87     {
  88        /* Call CreateFileW again because we need a handle with its own file pointer, and DuplicateHandle will return
  89         * a handle that shares its file pointer with the original.
  90         */
  91            *phfile = CreateFileW( pszFileName, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL );
  92
  93        if (*phfile == (HANDLE) HFILE_ERROR)
  94        {
  95            DWORD dwError = GetLastError();
  96
  97            CloseHandle(handle);
  98            return HRESULT_FROM_WIN32(dwError);
  99        }
 100     }
 101
 102     ucstr = heap_alloc_zero(sizeof(IUMCacheStream));
 103     if(ucstr)
 104     {
 105        ucstr->pszURL = heap_alloc_zero(sizeof(WCHAR) * (lstrlenW(pszURL) + 1));
 106        if (ucstr->pszURL)
 107        {
 108             ucstr->pszFileName = heap_alloc_zero(sizeof(WCHAR) * (lstrlenW(pszFileName) + 1));
 109            if (ucstr->pszFileName)
 110            {
 111               ucstr->lpVtbl=&stvt;
 112               ucstr->ref = 1;
 113               ucstr->handle = handle;
 114               ucstr->closed = 0;
 115               lstrcpyW(ucstr->pszURL, pszURL);
 116               lstrcpyW(ucstr->pszFileName, pszFileName);
 117
 118               *ppstr = ucstr;
 119
 120               return S_OK;
 121            }
 122            heap_free(ucstr->pszURL);
 123        }
 124        heap_free(ucstr);
 125     }
 126     CloseHandle(handle);
 127     if (phfile)
 128        CloseHandle(*phfile);
 129     return E_OUTOFMEMORY;
 130 }
 131
 132 void UMCloseCacheFileStream(IUMCacheStream *This)
 133 {
 134     if (!This->closed)
 135     {
 136        FILETIME ftZero;
 137
 138        ftZero.dwLowDateTime = ftZero.dwHighDateTime = 0;
 139
 140        This->closed = 1;
 141        CommitUrlCacheEntryW(This->pszURL,
 142                             This->pszFileName,
 143                             ftZero,
 144                             ftZero,
 145                             NORMAL_CACHE_ENTRY,
 146                             0,
 147                             0,
 148                             0,
 149                             0);
 150     }
 151 }
 152
 153 /**************************************************************************
 154 *  IStream_fnQueryInterface
 155 */
 156 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface,
 157                                                REFIID riid,
 158                                                LPVOID *ppvObj)
 159 {
 160     IUMCacheStream *This = (IUMCacheStream *)iface;
 161
 162     TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
 163
 164     *ppvObj = NULL;
 165
 166     if(IsEqualIID(riid, &IID_IUnknown) ||
 167        IsEqualIID(riid, &IID_IStream))
 168     {
 169       *ppvObj = This;
 170     }
 171
 172     if(*ppvObj)
 173     {
 174       IStream_AddRef((IStream*)*ppvObj);
 175       TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
 176       return S_OK;
 177     }
 178     TRACE("-- Interface: E_NOINTERFACE\n");
 179     return E_NOINTERFACE;
 180 }
 181
 182 /**************************************************************************
 183 *  IStream_fnAddRef
 184 */
 185 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
 186 {
 187     IUMCacheStream *This = (IUMCacheStream *)iface;
 188     ULONG refCount = InterlockedIncrement(&This->ref);
 189
 190     TRACE("(%p)->(count=%u)\n", This, refCount - 1);
 191
 192     return refCount;
 193 }
 194
 195 /**************************************************************************
 196 *  IStream_fnRelease
 197 */
 198 static ULONG WINAPI IStream_fnRelease(IStream *iface)
 199 {
 200     IUMCacheStream *This = (IUMCacheStream *)iface;
 201     ULONG refCount = InterlockedDecrement(&This->ref);
 202
 203     TRACE("(%p)->(count=%u)\n", This, refCount + 1);
 204
 205     if (!refCount)
 206     {
 207        TRACE(" destroying UMCacheStream (%p)\n",This);
 208        UMCloseCacheFileStream(This);
 209        CloseHandle(This->handle);
 210        heap_free(This->pszFileName);
 211        heap_free(This->pszURL);
 212        heap_free(This);
 213     }
 214     return refCount;
 215 }
 216
 217 static HRESULT WINAPI IStream_fnRead (IStream * iface,
 218                                       void* pv,
 219                                       ULONG cb,
 220                                       ULONG* pcbRead)
 221 {
 222     ULONG dwBytesRead;
 223     IUMCacheStream *This = (IUMCacheStream *)iface;
 224
 225     TRACE("(%p)->(%p,0x%08x,%p)\n",This, pv, cb, pcbRead);
 226
 227     if ( !pv )
 228        return STG_E_INVALIDPOINTER;
 229
 230     if ( !pcbRead)
 231         pcbRead = &dwBytesRead;
 232
 233     if ( ! ReadFile( This->handle, pv, cb, (LPDWORD)pcbRead, NULL ) )
 234        return S_FALSE;
 235
 236     if (!*pcbRead)
 237         return This->closed ? S_FALSE : E_PENDING;
 238     return S_OK;
 239 }
 240
 241 static HRESULT WINAPI IStream_fnWrite (IStream * iface,
 242                                        const void* pv,
 243                                        ULONG cb,
 244                                        ULONG* pcbWritten)
 245 {
 246     return E_NOTIMPL;
 247 }
 248
 249 static HRESULT WINAPI IStream_fnSeek (IStream * iface,
 250                                    LARGE_INTEGER dlibMove,
 251                                    DWORD dwOrigin,
 252                                    ULARGE_INTEGER* plibNewPosition)
 253 {
 254     LARGE_INTEGER newpos;
 255     IUMCacheStream *This = (IUMCacheStream *)iface;
 256
 257     TRACE("(%p)\n",This);
 258
 259     if (!SetFilePointerEx( This->handle, dlibMove, &newpos, dwOrigin ))
 260        return E_FAIL;
 261
 262     if (plibNewPosition)
 263         plibNewPosition->QuadPart = newpos.QuadPart;
 264
 265     return S_OK;
 266 }
 267
 268 static HRESULT WINAPI IStream_fnSetSize (IStream * iface,
 269                                          ULARGE_INTEGER libNewSize)
 270 {
 271     LARGE_INTEGER newpos;
 272     IUMCacheStream *This = (IUMCacheStream *)iface;
 273
 274     TRACE("(%p)\n",This);
 275
 276     newpos.QuadPart = libNewSize.QuadPart;
 277     if( ! SetFilePointerEx( This->handle, newpos, NULL, FILE_BEGIN ) )
 278        return E_FAIL;
 279
 280     if( ! SetEndOfFile( This->handle ) )
 281        return E_FAIL;
 282
 283     return S_OK;
 284 }
 285
 286 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface,
 287                                    IStream* pstm,
 288                                    ULARGE_INTEGER cb,
 289                                    ULARGE_INTEGER* pcbRead,
 290                                    ULARGE_INTEGER* pcbWritten)
 291 {
 292     IUMCacheStream *This = (IUMCacheStream *)iface;
 293
 294     TRACE("(%p)\n",This);
 295
 296     return E_NOTIMPL;
 297 }
 298
 299 static HRESULT WINAPI IStream_fnCommit (IStream * iface,
 300                                    DWORD grfCommitFlags)
 301 {
 302     IUMCacheStream *This = (IUMCacheStream *)iface;
 303
 304     TRACE("(%p)\n",This);
 305
 306     return E_NOTIMPL;
 307 }
 308
 309 static HRESULT WINAPI IStream_fnRevert (IStream * iface)
 310 {
 311     IUMCacheStream *This = (IUMCacheStream *)iface;
 312
 313     TRACE("(%p)\n",This);
 314
 315     return E_NOTIMPL;
 316 }
 317 static HRESULT WINAPI IStream_fnLockRegion (IStream * iface,
 318                                             ULARGE_INTEGER libOffset,
 319                                             ULARGE_INTEGER cb,
 320                                             DWORD dwLockType)
 321 {
 322     IUMCacheStream *This = (IUMCacheStream *)iface;
 323
 324     TRACE("(%p)\n",This);
 325
 326     return E_NOTIMPL;
 327 }
 328 static HRESULT WINAPI IStream_fnUnlockRegion (IStream * iface,
 329                                               ULARGE_INTEGER libOffset,
 330                                               ULARGE_INTEGER cb,
 331                                               DWORD dwLockType)
 332 {
 333     IUMCacheStream *This = (IUMCacheStream *)iface;
 334
 335     TRACE("(%p)\n",This);
 336
 337     return E_NOTIMPL;
 338 }
 339 static HRESULT WINAPI IStream_fnStat (IStream * iface,
 340                                       STATSTG*   pstatstg,
 341                                       DWORD grfStatFlag)
 342 {
 343     IUMCacheStream *This = (IUMCacheStream *)iface;
 344
 345     TRACE("(%p)\n",This);
 346
 347     return E_NOTIMPL;
 348 }
 349 static HRESULT WINAPI IStream_fnClone (IStream * iface,
 350                                        IStream** ppstm)
 351 {
 352     IUMCacheStream *This = (IUMCacheStream *)iface;
 353
 354     TRACE("(%p)\n",This);
 355
 356     return E_NOTIMPL;
 357 }
 358
 359 static const IStreamVtbl stvt =
 360 {
 361     IStream_fnQueryInterface,
 362     IStream_fnAddRef,
 363     IStream_fnRelease,
 364     IStream_fnRead,
 365     IStream_fnWrite,
 366     IStream_fnSeek,
 367     IStream_fnSetSize,
 368     IStream_fnCopyTo,
 369     IStream_fnCommit,
 370     IStream_fnRevert,
 371     IStream_fnLockRegion,
 372     IStream_fnUnlockRegion,
 373     IStream_fnStat,
 374     IStream_fnClone
 375
 376 };
 377
 378 typedef struct ProxyBindStatusCallback
 379 {
 380     const IBindStatusCallbackVtbl *lpVtbl;
 381
 382     IBindStatusCallback *pBSC;
 383 } ProxyBindStatusCallback;
 384
 385 static HRESULT WINAPI ProxyBindStatusCallback_QueryInterface(IBindStatusCallback *iface, REFIID riid, void **ppv)
 386 {
 387     if (IsEqualGUID(&IID_IBindStatusCallback, riid) ||
 388         IsEqualGUID(&IID_IUnknown, riid))
 389     {
 390         *ppv = iface;
 391         IUnknown_AddRef(iface);
 392         return S_OK;
 393     }
 394
 395     *ppv = NULL;
 396     return E_NOINTERFACE;
 397 }
 398
 399 static ULONG WINAPI ProxyBindStatusCallback_AddRef(IBindStatusCallback *iface)
 400 {
 401     return 2;
 402 }
 403
 404 static ULONG WINAPI ProxyBindStatusCallback_Release(IBindStatusCallback *iface)
 405 {
 406     return 1;
 407 }
 408
 409 static HRESULT WINAPI ProxyBindStatusCallback_OnStartBinding(IBindStatusCallback *iface, DWORD dwReserved,
 410                                                IBinding *pib)
 411 {
 412     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 413
 414     if(This->pBSC)
 415         return IBindStatusCallback_OnStartBinding(This->pBSC, dwReserved, pib);
 416
 417     return S_OK;
 418 }
 419
 420 static HRESULT WINAPI ProxyBindStatusCallback_GetPriority(IBindStatusCallback *iface, LONG *pnPriority)
 421 {
 422     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 423
 424     if(This->pBSC)
 425         return IBindStatusCallback_GetPriority(This->pBSC, pnPriority);
 426
 427     return S_OK;
 428 }
 429
 430 static HRESULT WINAPI ProxyBindStatusCallback_OnLowResource(IBindStatusCallback *iface, DWORD reserved)
 431 {
 432     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 433
 434     if(This->pBSC)
 435         return IBindStatusCallback_OnLowResource(This->pBSC, reserved);
 436
 437     return S_OK;
 438 }
 439
 440 static HRESULT WINAPI ProxyBindStatusCallback_OnProgress(IBindStatusCallback *iface, ULONG ulProgress,
 441                                            ULONG ulProgressMax, ULONG ulStatusCode, LPCWSTR szStatusText)
 442 {
 443     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 444
 445     if(This->pBSC)
 446         return IBindStatusCallback_OnProgress(This->pBSC, ulProgress,
 447                                           ulProgressMax, ulStatusCode,
 448                                           szStatusText);
 449
 450     return S_OK;
 451 }
 452
 453 static HRESULT WINAPI ProxyBindStatusCallback_OnStopBinding(IBindStatusCallback *iface, HRESULT hresult, LPCWSTR szError)
 454 {
 455     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 456
 457     if(This->pBSC)
 458         return IBindStatusCallback_OnStopBinding(This->pBSC, hresult, szError);
 459
 460     return S_OK;
 461 }
 462
 463 static HRESULT WINAPI ProxyBindStatusCallback_GetBindInfo(IBindStatusCallback *iface, DWORD *grfBINDF, BINDINFO *pbindinfo)
 464 {
 465     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 466
 467     if(This->pBSC)
 468         return IBindStatusCallback_GetBindInfo(This->pBSC, grfBINDF, pbindinfo);
 469
 470     return E_INVALIDARG;
 471 }
 472
 473 static HRESULT WINAPI ProxyBindStatusCallback_OnDataAvailable(IBindStatusCallback *iface, DWORD grfBSCF,
 474                                                               DWORD dwSize, FORMATETC* pformatetc, STGMEDIUM* pstgmed)
 475 {
 476     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 477
 478     if(This->pBSC)
 479         return IBindStatusCallback_OnDataAvailable(This->pBSC, grfBSCF, dwSize,
 480                                                pformatetc, pstgmed);
 481
 482     return S_OK;
 483 }
 484
 485 static HRESULT WINAPI ProxyBindStatusCallback_OnObjectAvailable(IBindStatusCallback *iface, REFIID riid, IUnknown *punk)
 486 {
 487     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 488
 489     if(This->pBSC)
 490         return IBindStatusCallback_OnObjectAvailable(This->pBSC, riid, punk);
 491
 492     return S_OK;
 493 }
 494
 495 static HRESULT WINAPI BlockingBindStatusCallback_OnDataAvailable(IBindStatusCallback *iface, DWORD grfBSCF,
 496                                                                  DWORD dwSize, FORMATETC* pformatetc, STGMEDIUM* pstgmed)
 497 {
 498     return S_OK;
 499 }
 500
 501 static const IBindStatusCallbackVtbl BlockingBindStatusCallbackVtbl =
 502 {
 503     ProxyBindStatusCallback_QueryInterface,
 504     ProxyBindStatusCallback_AddRef,
 505     ProxyBindStatusCallback_Release,
 506     ProxyBindStatusCallback_OnStartBinding,
 507     ProxyBindStatusCallback_GetPriority,
 508     ProxyBindStatusCallback_OnLowResource,
 509     ProxyBindStatusCallback_OnProgress,
 510     ProxyBindStatusCallback_OnStopBinding,
 511     ProxyBindStatusCallback_GetBindInfo,
 512     BlockingBindStatusCallback_OnDataAvailable,
 513     ProxyBindStatusCallback_OnObjectAvailable
 514 };
 515
 516 static HRESULT WINAPI AsyncBindStatusCallback_GetBindInfo(IBindStatusCallback *iface, DWORD *grfBINDF, BINDINFO *pbindinfo)
 517 {
 518     ProxyBindStatusCallback *This = (ProxyBindStatusCallback *)iface;
 519     HRESULT hr = IBindStatusCallback_GetBindInfo(This->pBSC, grfBINDF, pbindinfo);
 520     *grfBINDF |= BINDF_PULLDATA | BINDF_ASYNCHRONOUS | BINDF_ASYNCSTORAGE;
 521     return hr;
 522 }
 523
 524 static const IBindStatusCallbackVtbl AsyncBindStatusCallbackVtbl =
 525 {
 526     ProxyBindStatusCallback_QueryInterface,
 527     ProxyBindStatusCallback_AddRef,
 528     ProxyBindStatusCallback_Release,
 529     ProxyBindStatusCallback_OnStartBinding,
 530     ProxyBindStatusCallback_GetPriority,
 531     ProxyBindStatusCallback_OnLowResource,
 532     ProxyBindStatusCallback_OnProgress,
 533     ProxyBindStatusCallback_OnStopBinding,
 534     AsyncBindStatusCallback_GetBindInfo,
 535     ProxyBindStatusCallback_OnDataAvailable,
 536     ProxyBindStatusCallback_OnObjectAvailable
 537 };
 538
 539 static HRESULT URLStartDownload(LPCWSTR szURL, LPSTREAM *ppStream, IBindStatusCallback *pBSC)
 540 {
 541     HRESULT hr;
 542     IMoniker *pMoniker;
 543     IBindCtx *pbc;
 544
 545     *ppStream = NULL;
 546
 547     hr = CreateURLMoniker(NULL, szURL, &pMoniker);
 548     if (FAILED(hr))
 549         return hr;
 550
 551     hr = CreateBindCtx(0, &pbc);
 552     if (FAILED(hr))
 553     {
 554         IMoniker_Release(pMoniker);
 555         return hr;
 556     }
 557
 558     hr = RegisterBindStatusCallback(pbc, pBSC, NULL, 0);
 559     if (FAILED(hr))
 560     {
 561         IBindCtx_Release(pbc);
 562         IMoniker_Release(pMoniker);
 563         return hr;
 564     }
 565
 566     hr = IMoniker_BindToStorage(pMoniker, pbc, NULL, &IID_IStream, (void **)ppStream);
 567
 568     /* BindToStorage returning E_PENDING because it's asynchronous is not an error */
 569     if (hr == E_PENDING) hr = S_OK;
 570
 571     IBindCtx_Release(pbc);
 572     IMoniker_Release(pMoniker);
 573
 574     return hr;
 575 }
 576
 577 /***********************************************************************
 578  *              URLOpenBlockingStreamA (URLMON.@)
 579  */
 580 HRESULT WINAPI URLOpenBlockingStreamA(LPUNKNOWN pCaller, LPCSTR szURL,
 581                                       LPSTREAM *ppStream, DWORD dwReserved,
 582                                       LPBINDSTATUSCALLBACK lpfnCB)
 583 {
 584     LPWSTR szURLW;
 585     int len;
 586     HRESULT hr;
 587
 588     TRACE("(%p, %s, %p, 0x%x, %p)\n", pCaller, szURL, ppStream, dwReserved, lpfnCB);
 589
 590     if (!szURL || !ppStream)
 591         return E_INVALIDARG;
 592
 593     len = MultiByteToWideChar(CP_ACP, 0, szURL, -1, NULL, 0);
 594     szURLW = heap_alloc(len * sizeof(WCHAR));
 595     if (!szURLW)
 596     {
 597         *ppStream = NULL;
 598         return E_OUTOFMEMORY;
 599     }
 600     MultiByteToWideChar(CP_ACP, 0, szURL, -1, szURLW, len);
 601
 602     hr = URLOpenBlockingStreamW(pCaller, szURLW, ppStream, dwReserved, lpfnCB);
 603
 604     heap_free(szURLW);
 605
 606     return hr;
 607 }
 608
 609 /***********************************************************************
 610  *              URLOpenBlockingStreamW (URLMON.@)
 611  */
 612 HRESULT WINAPI URLOpenBlockingStreamW(LPUNKNOWN pCaller, LPCWSTR szURL,
 613                                       LPSTREAM *ppStream, DWORD dwReserved,
 614                                       LPBINDSTATUSCALLBACK lpfnCB)
 615 {
 616     ProxyBindStatusCallback blocking_bsc;
 617
 618     TRACE("(%p, %s, %p, 0x%x, %p)\n", pCaller, debugstr_w(szURL), ppStream,
 619           dwReserved, lpfnCB);
 620
 621     if (!szURL || !ppStream)
 622         return E_INVALIDARG;
 623
 624     blocking_bsc.lpVtbl = &BlockingBindStatusCallbackVtbl;
 625     blocking_bsc.pBSC = lpfnCB;
 626
 627     return URLStartDownload(szURL, ppStream, (IBindStatusCallback *)&blocking_bsc);
 628 }
 629
 630 /***********************************************************************
 631  *              URLOpenStreamA (URLMON.@)
 632  */
 633 HRESULT WINAPI URLOpenStreamA(LPUNKNOWN pCaller, LPCSTR szURL, DWORD dwReserved,
 634                               LPBINDSTATUSCALLBACK lpfnCB)
 635 {
 636     LPWSTR szURLW;
 637     int len;
 638     HRESULT hr;
 639
 640     TRACE("(%p, %s, 0x%x, %p)\n", pCaller, szURL, dwReserved, lpfnCB);
 641
 642     if (!szURL)
 643         return E_INVALIDARG;
 644
 645     len = MultiByteToWideChar(CP_ACP, 0, szURL, -1, NULL, 0);
 646     szURLW = heap_alloc(len * sizeof(WCHAR));
 647     if (!szURLW)
 648         return E_OUTOFMEMORY;
 649     MultiByteToWideChar(CP_ACP, 0, szURL, -1, szURLW, len);
 650
 651     hr = URLOpenStreamW(pCaller, szURLW, dwReserved, lpfnCB);
 652
 653     heap_free(szURLW);
 654
 655     return hr;
 656 }
 657
 658 /***********************************************************************
 659  *              URLOpenStreamW (URLMON.@)
 660  */
 661 HRESULT WINAPI URLOpenStreamW(LPUNKNOWN pCaller, LPCWSTR szURL, DWORD dwReserved,
 662                               LPBINDSTATUSCALLBACK lpfnCB)
 663 {
 664     HRESULT hr;
 665     ProxyBindStatusCallback async_bsc;
 666     IStream *pStream;
 667
 668     TRACE("(%p, %s, 0x%x, %p)\n", pCaller, debugstr_w(szURL), dwReserved,
 669           lpfnCB);
 670
 671     if (!szURL)
 672         return E_INVALIDARG;
 673
 674     async_bsc.lpVtbl = &AsyncBindStatusCallbackVtbl;
 675     async_bsc.pBSC = lpfnCB;
 676
 677     hr = URLStartDownload(szURL, &pStream, (IBindStatusCallback *)&async_bsc);
 678     if (SUCCEEDED(hr) && pStream)
 679         IStream_Release(pStream);
 680
 681     return hr;
 682 }