dlls/propsys/propvar.c

   1 /*
   2  * PropVariant implementation
   3  *
   4  * Copyright 2008 James Hawkins for CodeWeavers
   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
  21
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 #define NONAMELESSUNION
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "winerror.h"
  31 #include "winreg.h"
  32 #include "winuser.h"
  33 #include "shlobj.h"
  34 #include "propvarutil.h"
  35 #include "strsafe.h"
  36
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(propsys);
  40
  41 static HRESULT PROPVAR_ConvertFILETIME(const FILETIME *ft, PROPVARIANT *ppropvarDest, VARTYPE vt)
  42 {
  43     SYSTEMTIME time;
  44
  45     FileTimeToSystemTime(ft, &time);
  46
  47     switch (vt)
  48     {
  49         case VT_LPSTR:
  50             ppropvarDest->pszVal = HeapAlloc(GetProcessHeap(), 0, 64);
  51             if (!ppropvarDest->pszVal)
  52                 return E_OUTOFMEMORY;
  53
  54             sprintf( ppropvarDest->pszVal, "%04d/%02d/%02d:%02d:%02d:%02d.%03d",
  55                       time.wYear, time.wMonth, time.wDay,
  56                       time.wHour, time.wMinute, time.wSecond,
  57                       time.wMilliseconds );
  58
  59             return S_OK;
  60
  61         default:
  62             FIXME("Unhandled target type: %d\n", vt);
  63     }
  64
  65     return E_FAIL;
  66 }
  67
  68 static HRESULT PROPVAR_ConvertNumber(REFPROPVARIANT pv, int dest_bits,
  69                                      BOOL dest_signed, LONGLONG *res)
  70 {
  71     BOOL src_signed;
  72
  73     switch (pv->vt)
  74     {
  75     case VT_I1:
  76         src_signed = TRUE;
  77         *res = pv->cVal;
  78         break;
  79     case VT_UI1:
  80         src_signed = FALSE;
  81         *res = pv->bVal;
  82         break;
  83     case VT_I2:
  84         src_signed = TRUE;
  85         *res = pv->iVal;
  86         break;
  87     case VT_UI2:
  88         src_signed = FALSE;
  89         *res = pv->uiVal;
  90         break;
  91     case VT_I4:
  92         src_signed = TRUE;
  93         *res = pv->lVal;
  94         break;
  95     case VT_UI4:
  96         src_signed = FALSE;
  97         *res = pv->ulVal;
  98         break;
  99     case VT_I8:
 100         src_signed = TRUE;
 101         *res = pv->hVal.QuadPart;
 102         break;
 103     case VT_UI8:
 104         src_signed = FALSE;
 105         *res = pv->uhVal.QuadPart;
 106         break;
 107     case VT_EMPTY:
 108         src_signed = FALSE;
 109         *res = 0;
 110         break;
 111     case VT_LPSTR:
 112     {
 113         char *end;
 114         *res = strtoll(pv->pszVal, &end, 0);
 115         if (pv->pszVal == end)
 116             return DISP_E_TYPEMISMATCH;
 117         src_signed = *res < 0;
 118         break;
 119     }
 120     case VT_LPWSTR:
 121     case VT_BSTR:
 122     {
 123         WCHAR *end;
 124         *res = wcstol(pv->pwszVal, &end, 0);
 125         if (pv->pwszVal == end)
 126             return DISP_E_TYPEMISMATCH;
 127         src_signed = *res < 0;
 128         break;
 129     }
 130     case VT_R8:
 131     {
 132         src_signed = TRUE;
 133         *res = pv->dblVal;
 134         break;
 135     }
 136     default:
 137         FIXME("unhandled vt %d\n", pv->vt);
 138         return E_NOTIMPL;
 139     }
 140
 141     if (*res < 0 && src_signed != dest_signed)
 142         return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
 143
 144     if (dest_bits < 64)
 145     {
 146         if (dest_signed)
 147         {
 148             if (*res >= ((LONGLONG)1 << (dest_bits-1)) ||
 149                 *res < ((LONGLONG)-1 << (dest_bits-1)))
 150                 return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
 151         }
 152         else
 153         {
 154             if ((ULONGLONG)(*res) >= ((ULONGLONG)1 << dest_bits))
 155                 return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
 156         }
 157     }
 158
 159     return S_OK;
 160 }
 161
 162 HRESULT WINAPI PropVariantToDouble(REFPROPVARIANT propvarIn, double *ret)
 163 {
 164     LONGLONG res;
 165     HRESULT hr;
 166
 167     TRACE("(%p, %p)\n", propvarIn, ret);
 168
 169     hr = PROPVAR_ConvertNumber(propvarIn, 64, TRUE, &res);
 170     if (SUCCEEDED(hr)) *ret = (double)res;
 171     return hr;
 172 }
 173
 174 HRESULT WINAPI PropVariantToInt16(REFPROPVARIANT propvarIn, SHORT *ret)
 175 {
 176     LONGLONG res;
 177     HRESULT hr;
 178
 179     TRACE("%p,%p\n", propvarIn, ret);
 180
 181     hr = PROPVAR_ConvertNumber(propvarIn, 16, TRUE, &res);
 182     if (SUCCEEDED(hr)) *ret = (SHORT)res;
 183     return hr;
 184 }
 185
 186 HRESULT WINAPI PropVariantToInt32(REFPROPVARIANT propvarIn, LONG *ret)
 187 {
 188     LONGLONG res;
 189     HRESULT hr;
 190
 191     TRACE("%p,%p\n", propvarIn, ret);
 192
 193     hr = PROPVAR_ConvertNumber(propvarIn, 32, TRUE, &res);
 194     if (SUCCEEDED(hr)) *ret = (LONG)res;
 195     return hr;
 196 }
 197
 198 HRESULT WINAPI PropVariantToInt64(REFPROPVARIANT propvarIn, LONGLONG *ret)
 199 {
 200     LONGLONG res;
 201     HRESULT hr;
 202
 203     TRACE("%p,%p\n", propvarIn, ret);
 204
 205     hr = PROPVAR_ConvertNumber(propvarIn, 64, TRUE, &res);
 206     if (SUCCEEDED(hr)) *ret = res;
 207     return hr;
 208 }
 209
 210 HRESULT WINAPI PropVariantToUInt16(REFPROPVARIANT propvarIn, USHORT *ret)
 211 {
 212     LONGLONG res;
 213     HRESULT hr;
 214
 215     TRACE("%p,%p\n", propvarIn, ret);
 216
 217     hr = PROPVAR_ConvertNumber(propvarIn, 16, FALSE, &res);
 218     if (SUCCEEDED(hr)) *ret = (USHORT)res;
 219     return hr;
 220 }
 221
 222 HRESULT WINAPI PropVariantToUInt32(REFPROPVARIANT propvarIn, ULONG *ret)
 223 {
 224     LONGLONG res;
 225     HRESULT hr;
 226
 227     TRACE("%p,%p\n", propvarIn, ret);
 228
 229     hr = PROPVAR_ConvertNumber(propvarIn, 32, FALSE, &res);
 230     if (SUCCEEDED(hr)) *ret = (ULONG)res;
 231     return hr;
 232 }
 233
 234 HRESULT WINAPI PropVariantToUInt64(REFPROPVARIANT propvarIn, ULONGLONG *ret)
 235 {
 236     LONGLONG res;
 237     HRESULT hr;
 238
 239     TRACE("%p,%p\n", propvarIn, ret);
 240
 241     hr = PROPVAR_ConvertNumber(propvarIn, 64, FALSE, &res);
 242     if (SUCCEEDED(hr)) *ret = (ULONGLONG)res;
 243     return hr;
 244 }
 245
 246 HRESULT WINAPI PropVariantToBoolean(REFPROPVARIANT propvarIn, BOOL *ret)
 247 {
 248     LONGLONG res;
 249     HRESULT hr;
 250
 251     TRACE("%p,%p\n", propvarIn, ret);
 252
 253     *ret = FALSE;
 254
 255     switch (propvarIn->vt)
 256     {
 257         case VT_BOOL:
 258             *ret = propvarIn->boolVal == VARIANT_TRUE;
 259             return S_OK;
 260
 261         case VT_LPWSTR:
 262         case VT_BSTR:
 263             if (!propvarIn->pwszVal)
 264                 return DISP_E_TYPEMISMATCH;
 265
 266             if (!lstrcmpiW(propvarIn->pwszVal, L"true") || !lstrcmpW(propvarIn->pwszVal, L"#TRUE#"))
 267             {
 268                 *ret = TRUE;
 269                 return S_OK;
 270             }
 271
 272             if (!lstrcmpiW(propvarIn->pwszVal, L"false") || !lstrcmpW(propvarIn->pwszVal, L"#FALSE#"))
 273             {
 274                 *ret = FALSE;
 275                 return S_OK;
 276             }
 277             break;
 278
 279          case VT_LPSTR:
 280             if (!propvarIn->pszVal)
 281                 return DISP_E_TYPEMISMATCH;
 282
 283             if (!lstrcmpiA(propvarIn->pszVal, "true") || !lstrcmpA(propvarIn->pszVal, "#TRUE#"))
 284             {
 285                 *ret = TRUE;
 286                 return S_OK;
 287             }
 288
 289             if (!lstrcmpiA(propvarIn->pszVal, "false") || !lstrcmpA(propvarIn->pszVal, "#FALSE#"))
 290             {
 291                 *ret = FALSE;
 292                 return S_OK;
 293             }
 294             break;
 295     }
 296
 297     hr = PROPVAR_ConvertNumber(propvarIn, 64, TRUE, &res);
 298     *ret = !!res;
 299     return hr;
 300 }
 301
 302 HRESULT WINAPI PropVariantToBuffer(REFPROPVARIANT propvarIn, void *ret, UINT cb)
 303 {
 304     HRESULT hr = S_OK;
 305
 306     TRACE("(%p, %p, %d)\n", propvarIn, ret, cb);
 307
 308     switch(propvarIn->vt)
 309     {
 310         case VT_VECTOR|VT_UI1:
 311             if(cb > propvarIn->caub.cElems)
 312                 return E_FAIL;
 313             memcpy(ret, propvarIn->caub.pElems, cb);
 314             break;
 315         case VT_ARRAY|VT_UI1:
 316             FIXME("Unsupported type: VT_ARRAY|VT_UI1\n");
 317             hr = E_NOTIMPL;
 318             break;
 319         default:
 320             WARN("Unexpected type: %x\n", propvarIn->vt);
 321             hr = E_INVALIDARG;
 322     }
 323
 324     return hr;
 325 }
 326
 327
 328 HRESULT WINAPI PropVariantToString(REFPROPVARIANT propvarIn, PWSTR ret, UINT cch)
 329 {
 330     HRESULT hr;
 331     WCHAR *stringW = NULL;
 332
 333     TRACE("(%p, %p, %d)\n", propvarIn, ret, cch);
 334
 335     ret[0] = '\0';
 336
 337     if(!cch)
 338         return E_INVALIDARG;
 339
 340     hr = PropVariantToStringAlloc(propvarIn, &stringW);
 341     if(SUCCEEDED(hr))
 342     {
 343         if(lstrlenW(stringW) >= cch)
 344             hr = STRSAFE_E_INSUFFICIENT_BUFFER;
 345         lstrcpynW(ret, stringW, cch);
 346         CoTaskMemFree(stringW);
 347     }
 348
 349     return hr;
 350 }
 351
 352 HRESULT WINAPI PropVariantToStringAlloc(REFPROPVARIANT propvarIn, WCHAR **ret)
 353 {
 354     WCHAR *res = NULL;
 355     HRESULT hr = S_OK;
 356
 357     TRACE("%p,%p semi-stub\n", propvarIn, ret);
 358
 359     switch(propvarIn->vt)
 360     {
 361         case VT_EMPTY:
 362         case VT_NULL:
 363             res = CoTaskMemAlloc(1*sizeof(WCHAR));
 364             res[0] = '\0';
 365             break;
 366
 367         case VT_LPSTR:
 368             if(propvarIn->pszVal)
 369             {
 370                 DWORD len;
 371
 372                 len = MultiByteToWideChar(CP_ACP, 0, propvarIn->pszVal, -1, NULL, 0);
 373                 res = CoTaskMemAlloc(len*sizeof(WCHAR));
 374                 if(!res)
 375                     return E_OUTOFMEMORY;
 376
 377                 MultiByteToWideChar(CP_ACP, 0, propvarIn->pszVal, -1, res, len);
 378             }
 379             break;
 380
 381         case VT_LPWSTR:
 382         case VT_BSTR:
 383             if (propvarIn->pwszVal)
 384             {
 385                 DWORD size = (lstrlenW(propvarIn->pwszVal) + 1) * sizeof(WCHAR);
 386                 res = CoTaskMemAlloc(size);
 387                 if(!res) return E_OUTOFMEMORY;
 388                 memcpy(res, propvarIn->pwszVal, size);
 389             }
 390             break;
 391
 392         default:
 393             FIXME("Unsupported conversion (%d)\n", propvarIn->vt);
 394             hr = E_FAIL;
 395             break;
 396     }
 397
 398     *ret = res;
 399
 400     return hr;
 401 }
 402
 403 PCWSTR WINAPI PropVariantToStringWithDefault(REFPROPVARIANT propvarIn, LPCWSTR pszDefault)
 404 {
 405     if (propvarIn->vt == VT_BSTR)
 406     {
 407         if (propvarIn->bstrVal == NULL)
 408             return L"";
 409
 410         return propvarIn->bstrVal;
 411     }
 412
 413     if (propvarIn->vt == VT_LPWSTR && propvarIn->pwszVal != NULL)
 414         return propvarIn->pwszVal;
 415
 416     return pszDefault;
 417 }
 418
 419
 420 /******************************************************************
 421  *  PropVariantChangeType   (PROPSYS.@)
 422  */
 423 HRESULT WINAPI PropVariantChangeType(PROPVARIANT *ppropvarDest, REFPROPVARIANT propvarSrc,
 424                                      PROPVAR_CHANGE_FLAGS flags, VARTYPE vt)
 425 {
 426     HRESULT hr;
 427
 428     FIXME("(%p, %p, %d, %d, %d): semi-stub!\n", ppropvarDest, propvarSrc,
 429           propvarSrc->vt, flags, vt);
 430
 431     if (vt == propvarSrc->vt)
 432         return PropVariantCopy(ppropvarDest, propvarSrc);
 433
 434     if (propvarSrc->vt == VT_FILETIME)
 435         return PROPVAR_ConvertFILETIME(&propvarSrc->filetime, ppropvarDest, vt);
 436
 437     switch (vt)
 438     {
 439     case VT_I1:
 440     {
 441         LONGLONG res;
 442
 443         hr = PROPVAR_ConvertNumber(propvarSrc, 8, TRUE, &res);
 444         if (SUCCEEDED(hr))
 445         {
 446             ppropvarDest->vt = VT_I1;
 447             ppropvarDest->cVal = (char)res;
 448         }
 449         return hr;
 450     }
 451
 452     case VT_UI1:
 453     {
 454         LONGLONG res;
 455
 456         hr = PROPVAR_ConvertNumber(propvarSrc, 8, FALSE, &res);
 457         if (SUCCEEDED(hr))
 458         {
 459             ppropvarDest->vt = VT_UI1;
 460             ppropvarDest->bVal = (UCHAR)res;
 461         }
 462         return hr;
 463     }
 464
 465     case VT_I2:
 466     {
 467         SHORT res;
 468         hr = PropVariantToInt16(propvarSrc, &res);
 469         if (SUCCEEDED(hr))
 470         {
 471             ppropvarDest->vt = VT_I2;
 472             ppropvarDest->iVal = res;
 473         }
 474         return hr;
 475     }
 476     case VT_UI2:
 477     {
 478         USHORT res;
 479         hr = PropVariantToUInt16(propvarSrc, &res);
 480         if (SUCCEEDED(hr))
 481         {
 482             ppropvarDest->vt = VT_UI2;
 483             ppropvarDest->uiVal = res;
 484         }
 485         return hr;
 486     }
 487     case VT_I4:
 488     {
 489         LONG res;
 490         hr = PropVariantToInt32(propvarSrc, &res);
 491         if (SUCCEEDED(hr))
 492         {
 493             ppropvarDest->vt = VT_I4;
 494             ppropvarDest->lVal = res;
 495         }
 496         return hr;
 497     }
 498     case VT_UI4:
 499     {
 500         ULONG res;
 501         hr = PropVariantToUInt32(propvarSrc, &res);
 502         if (SUCCEEDED(hr))
 503         {
 504             ppropvarDest->vt = VT_UI4;
 505             ppropvarDest->ulVal = res;
 506         }
 507         return hr;
 508     }
 509     case VT_I8:
 510     {
 511         LONGLONG res;
 512         hr = PropVariantToInt64(propvarSrc, &res);
 513         if (SUCCEEDED(hr))
 514         {
 515             ppropvarDest->vt = VT_I8;
 516             ppropvarDest->hVal.QuadPart = res;
 517         }
 518         return hr;
 519     }
 520     case VT_UI8:
 521     {
 522         ULONGLONG res;
 523         hr = PropVariantToUInt64(propvarSrc, &res);
 524         if (SUCCEEDED(hr))
 525         {
 526             ppropvarDest->vt = VT_UI8;
 527             ppropvarDest->uhVal.QuadPart = res;
 528         }
 529         return hr;
 530     }
 531
 532     case VT_LPWSTR:
 533     case VT_BSTR:
 534     {
 535         WCHAR *res;
 536         hr = PropVariantToStringAlloc(propvarSrc, &res);
 537         if (SUCCEEDED(hr))
 538         {
 539             ppropvarDest->vt = VT_LPWSTR;
 540             ppropvarDest->pwszVal = res;
 541         }
 542         return hr;
 543     }
 544
 545     case VT_LPSTR:
 546     {
 547         WCHAR *resW;
 548         hr = PropVariantToStringAlloc(propvarSrc, &resW);
 549         if (SUCCEEDED(hr))
 550         {
 551             char *res;
 552             DWORD len;
 553
 554             len = WideCharToMultiByte(CP_ACP, 0, resW, -1, NULL, 0, NULL, NULL);
 555             res = CoTaskMemAlloc(len);
 556             if (res)
 557             {
 558                 WideCharToMultiByte(CP_ACP, 0, resW, -1, res, len, NULL, NULL);
 559                 ppropvarDest->vt = VT_LPSTR;
 560                 ppropvarDest->pszVal = res;
 561             }
 562             else
 563                 hr = E_OUTOFMEMORY;
 564
 565             CoTaskMemFree(resW);
 566         }
 567         return hr;
 568     }
 569
 570     default:
 571         FIXME("Unhandled dest type: %d\n", vt);
 572         return E_FAIL;
 573     }
 574 }
 575
 576 static void PROPVAR_GUIDToWSTR(REFGUID guid, WCHAR *str)
 577 {
 578     swprintf(str, 39, L"{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}", guid->Data1,
 579             guid->Data2, guid->Data3, guid->Data4[0], guid->Data4[1], guid->Data4[2],
 580             guid->Data4[3], guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
 581 }
 582
 583 HRESULT WINAPI InitPropVariantFromGUIDAsString(REFGUID guid, PROPVARIANT *ppropvar)
 584 {
 585     TRACE("(%p %p)\n", guid, ppropvar);
 586
 587     if(!guid)
 588         return E_FAIL;
 589
 590     ppropvar->vt = VT_LPWSTR;
 591     ppropvar->pwszVal = CoTaskMemAlloc(39*sizeof(WCHAR));
 592     if(!ppropvar->pwszVal)
 593         return E_OUTOFMEMORY;
 594
 595     PROPVAR_GUIDToWSTR(guid, ppropvar->pwszVal);
 596     return S_OK;
 597 }
 598
 599 HRESULT WINAPI InitVariantFromGUIDAsString(REFGUID guid, VARIANT *pvar)
 600 {
 601     TRACE("(%p %p)\n", guid, pvar);
 602
 603     if(!guid) {
 604         FIXME("guid == NULL\n");
 605         return E_FAIL;
 606     }
 607
 608     V_VT(pvar) = VT_BSTR;
 609     V_BSTR(pvar) = SysAllocStringLen(NULL, 38);
 610     if(!V_BSTR(pvar))
 611         return E_OUTOFMEMORY;
 612
 613     PROPVAR_GUIDToWSTR(guid, V_BSTR(pvar));
 614     return S_OK;
 615 }
 616
 617 HRESULT WINAPI InitPropVariantFromBuffer(const VOID *pv, UINT cb, PROPVARIANT *ppropvar)
 618 {
 619     TRACE("(%p %u %p)\n", pv, cb, ppropvar);
 620
 621     ppropvar->caub.pElems = CoTaskMemAlloc(cb);
 622     if(!ppropvar->caub.pElems)
 623         return E_OUTOFMEMORY;
 624
 625     ppropvar->vt = VT_VECTOR|VT_UI1;
 626     ppropvar->caub.cElems = cb;
 627     memcpy(ppropvar->caub.pElems, pv, cb);
 628     return S_OK;
 629 }
 630
 631 HRESULT WINAPI InitPropVariantFromCLSID(REFCLSID clsid, PROPVARIANT *ppropvar)
 632 {
 633     TRACE("(%s %p)\n", debugstr_guid(clsid), ppropvar);
 634
 635     ppropvar->puuid = CoTaskMemAlloc(sizeof(*ppropvar->puuid));
 636     if(!ppropvar->puuid)
 637         return E_OUTOFMEMORY;
 638
 639     ppropvar->vt = VT_CLSID;
 640     memcpy(ppropvar->puuid, clsid, sizeof(*ppropvar->puuid));
 641     return S_OK;
 642 }
 643
 644 HRESULT WINAPI InitVariantFromBuffer(const VOID *pv, UINT cb, VARIANT *pvar)
 645 {
 646     SAFEARRAY *arr;
 647     void *data;
 648     HRESULT hres;
 649
 650     TRACE("(%p %u %p)\n", pv, cb, pvar);
 651
 652     arr = SafeArrayCreateVector(VT_UI1, 0, cb);
 653     if(!arr)
 654         return E_OUTOFMEMORY;
 655
 656     hres = SafeArrayAccessData(arr, &data);
 657     if(FAILED(hres)) {
 658         SafeArrayDestroy(arr);
 659         return hres;
 660     }
 661
 662     memcpy(data, pv, cb);
 663
 664     hres = SafeArrayUnaccessData(arr);
 665     if(FAILED(hres)) {
 666         SafeArrayDestroy(arr);
 667         return hres;
 668     }
 669
 670     V_VT(pvar) = VT_ARRAY|VT_UI1;
 671     V_ARRAY(pvar) = arr;
 672     return S_OK;
 673 }
 674
 675 static inline DWORD PROPVAR_HexToNum(const WCHAR *hex)
 676 {
 677     DWORD ret;
 678
 679     if(hex[0]>='0' && hex[0]<='9')
 680         ret = hex[0]-'0';
 681     else if(hex[0]>='a' && hex[0]<='f')
 682         ret = hex[0]-'a'+10;
 683     else if(hex[0]>='A' && hex[0]<='F')
 684         ret = hex[0]-'A'+10;
 685     else
 686         return -1;
 687
 688     ret <<= 4;
 689     if(hex[1]>='0' && hex[1]<='9')
 690         return ret + hex[1]-'0';
 691     else if(hex[1]>='a' && hex[1]<='f')
 692         return ret + hex[1]-'a'+10;
 693     else if(hex[1]>='A' && hex[1]<='F')
 694         return ret + hex[1]-'A'+10;
 695     else
 696         return -1;
 697 }
 698
 699 static inline HRESULT PROPVAR_WCHARToGUID(const WCHAR *str, int len, GUID *guid)
 700 {
 701     DWORD i, val=0;
 702     const WCHAR *p;
 703
 704     memset(guid, 0, sizeof(GUID));
 705
 706     if(len!=38 || str[0]!='{' || str[9]!='-' || str[14]!='-'
 707             || str[19]!='-' || str[24]!='-' || str[37]!='}') {
 708         WARN("Error parsing %s\n", debugstr_w(str));
 709         return E_INVALIDARG;
 710     }
 711
 712     p = str+1;
 713     for(i=0; i<4 && val!=-1; i++) {
 714         val = PROPVAR_HexToNum(p);
 715         guid->Data1 = (guid->Data1<<8) + val;
 716         p += 2;
 717     }
 718     p++;
 719     for(i=0; i<2 && val!=-1; i++) {
 720         val = PROPVAR_HexToNum(p);
 721         guid->Data2 = (guid->Data2<<8) + val;
 722         p += 2;
 723     }
 724     p++;
 725     for(i=0; i<2 && val!=-1; i++) {
 726         val = PROPVAR_HexToNum(p);
 727         guid->Data3 = (guid->Data3<<8) + val;
 728         p += 2;
 729     }
 730     p++;
 731     for(i=0; i<8 && val!=-1; i++) {
 732         if(i == 2)
 733             p++;
 734
 735         val = guid->Data4[i] = PROPVAR_HexToNum(p);
 736         p += 2;
 737     }
 738
 739     if(val == -1) {
 740         WARN("Error parsing %s\n", debugstr_w(str));
 741         memset(guid, 0, sizeof(GUID));
 742         return E_INVALIDARG;
 743     }
 744     return S_OK;
 745 }
 746
 747 HRESULT WINAPI PropVariantToGUID(const PROPVARIANT *ppropvar, GUID *guid)
 748 {
 749     TRACE("%p %p)\n", ppropvar, guid);
 750
 751     switch(ppropvar->vt) {
 752     case VT_BSTR:
 753         return PROPVAR_WCHARToGUID(ppropvar->bstrVal, SysStringLen(ppropvar->bstrVal), guid);
 754     case VT_LPWSTR:
 755         return PROPVAR_WCHARToGUID(ppropvar->pwszVal, lstrlenW(ppropvar->pwszVal), guid);
 756     case VT_CLSID:
 757         memcpy(guid, ppropvar->puuid, sizeof(*ppropvar->puuid));
 758         return S_OK;
 759
 760     default:
 761         FIXME("unsupported vt: %d\n", ppropvar->vt);
 762         return E_NOTIMPL;
 763     }
 764 }
 765
 766 HRESULT WINAPI VariantToGUID(const VARIANT *pvar, GUID *guid)
 767 {
 768     TRACE("(%p %p)\n", pvar, guid);
 769
 770     switch(V_VT(pvar)) {
 771     case VT_BSTR: {
 772         HRESULT hres = PROPVAR_WCHARToGUID(V_BSTR(pvar), SysStringLen(V_BSTR(pvar)), guid);
 773         if(hres == E_INVALIDARG)
 774             return E_FAIL;
 775         return hres;
 776     }
 777
 778     default:
 779         FIXME("unsupported vt: %d\n", V_VT(pvar));
 780         return E_NOTIMPL;
 781     }
 782 }
 783
 784 static BOOL isemptyornull(const PROPVARIANT *propvar)
 785 {
 786     if (propvar->vt == VT_EMPTY || propvar->vt == VT_NULL)
 787         return TRUE;
 788     if ((propvar->vt & VT_ARRAY) == VT_ARRAY)
 789     {
 790         int i;
 791         for (i=0; i<propvar->parray->cDims; i++)
 792         {
 793             if (propvar->parray->rgsabound[i].cElements != 0)
 794                 break;
 795         }
 796         return i == propvar->parray->cDims;
 797     }
 798     if (propvar->vt == VT_CLSID)
 799         return !propvar->puuid;
 800
 801     /* FIXME: vectors, byrefs, errors? */
 802     return FALSE;
 803 }
 804
 805 INT WINAPI PropVariantCompareEx(REFPROPVARIANT propvar1, REFPROPVARIANT propvar2,
 806     PROPVAR_COMPARE_UNIT unit, PROPVAR_COMPARE_FLAGS flags)
 807 {
 808     const PROPVARIANT *propvar2_converted;
 809     PROPVARIANT propvar2_static;
 810     HRESULT hr;
 811     INT res=-1;
 812
 813     TRACE("%p,%p,%x,%x\n", propvar1, propvar2, unit, flags);
 814
 815     if (isemptyornull(propvar1))
 816     {
 817         if (isemptyornull(propvar2))
 818             return 0;
 819         return (flags & PVCF_TREATEMPTYASGREATERTHAN) ? 1 : -1;
 820     }
 821
 822     if (isemptyornull(propvar2))
 823         return (flags & PVCF_TREATEMPTYASGREATERTHAN) ? -1 : 1;
 824
 825     if (propvar1->vt != propvar2->vt)
 826     {
 827         hr = PropVariantChangeType(&propvar2_static, propvar2, 0, propvar1->vt);
 828
 829         if (FAILED(hr))
 830             return -1;
 831
 832         propvar2_converted = &propvar2_static;
 833     }
 834     else
 835         propvar2_converted = propvar2;
 836
 837 #define CMP_NUM_VALUE(var) do { \
 838     if (propvar1->var > propvar2_converted->var) \
 839         res = 1; \
 840     else if (propvar1->var < propvar2_converted->var) \
 841         res = -1; \
 842     else \
 843         res = 0; \
 844     } while (0)
 845
 846     switch (propvar1->vt)
 847     {
 848     case VT_I1:
 849         CMP_NUM_VALUE(cVal);
 850         break;
 851     case VT_UI1:
 852         CMP_NUM_VALUE(bVal);
 853         break;
 854     case VT_I2:
 855         CMP_NUM_VALUE(iVal);
 856         break;
 857     case VT_UI2:
 858         CMP_NUM_VALUE(uiVal);
 859         break;
 860     case VT_I4:
 861         CMP_NUM_VALUE(lVal);
 862         break;
 863     case VT_UI4:
 864         CMP_NUM_VALUE(uiVal);
 865         break;
 866     case VT_I8:
 867         CMP_NUM_VALUE(hVal.QuadPart);
 868         break;
 869     case VT_UI8:
 870         CMP_NUM_VALUE(uhVal.QuadPart);
 871         break;
 872     case VT_R4:
 873         CMP_NUM_VALUE(fltVal);
 874         break;
 875     case VT_R8:
 876         CMP_NUM_VALUE(dblVal);
 877         break;
 878     case VT_BSTR:
 879     case VT_LPWSTR:
 880         /* FIXME: Use other string flags. */
 881         if (flags & (PVCF_USESTRCMPI | PVCF_USESTRCMPIC))
 882             res = lstrcmpiW(propvar1->bstrVal, propvar2_converted->bstrVal);
 883         else
 884             res = lstrcmpW(propvar1->bstrVal, propvar2_converted->bstrVal);
 885         break;
 886     case VT_LPSTR:
 887         /* FIXME: Use other string flags. */
 888         if (flags & (PVCF_USESTRCMPI | PVCF_USESTRCMPIC))
 889             res = lstrcmpiA(propvar1->pszVal, propvar2_converted->pszVal);
 890         else
 891             res = lstrcmpA(propvar1->pszVal, propvar2_converted->pszVal);
 892         break;
 893     case VT_CLSID:
 894         res = memcmp(propvar1->puuid, propvar2->puuid, sizeof(*propvar1->puuid));
 895         if (res) res = res > 0 ? 1 : -1;
 896         break;
 897     default:
 898         FIXME("vartype %#x not handled\n", propvar1->vt);
 899         res = -1;
 900         break;
 901     }
 902
 903     if (propvar2_converted == &propvar2_static)
 904         PropVariantClear(&propvar2_static);
 905
 906     return res;
 907 }