dlls/urlmon/urlmon_main.c

   1 /*
   2  * UrlMon
   3  *
   4  * Copyright (c) 2000 Patrik Stridvall
   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 #include <stdarg.h>
  22
  23 #define COBJMACROS
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winreg.h"
  28
  29 #define NO_SHLWAPI_REG
  30 #include "shlwapi.h"
  31 #include "wine/debug.h"
  32 #include "wine/unicode.h"
  33
  34 #include "winuser.h"
  35 #include "urlmon.h"
  36 #include "urlmon_main.h"
  37 #include "ole2.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(urlmon);
  40
  41 LONG URLMON_refCount = 0;
  42
  43 HINSTANCE URLMON_hInstance = 0;
  44 static HMODULE hCabinet = NULL;
  45
  46 static void init_session(BOOL);
  47
  48 /***********************************************************************
  49  *              DllMain (URLMON.init)
  50  */
  51 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID fImpLoad)
  52 {
  53     TRACE("%p 0x%x %p\n", hinstDLL, fdwReason, fImpLoad);
  54
  55     switch(fdwReason) {
  56     case DLL_PROCESS_ATTACH:
  57         DisableThreadLibraryCalls(hinstDLL);
  58         URLMON_hInstance = hinstDLL;
  59         init_session(TRUE);
  60         break;
  61
  62     case DLL_PROCESS_DETACH:
  63         if (hCabinet)
  64             FreeLibrary(hCabinet);
  65         hCabinet = NULL;
  66         init_session(FALSE);
  67         URLMON_hInstance = 0;
  68         break;
  69     }
  70     return TRUE;
  71 }
  72
  73
  74 /***********************************************************************
  75  *              DllInstall (URLMON.@)
  76  */
  77 HRESULT WINAPI DllInstall(BOOL bInstall, LPCWSTR cmdline)
  78 {
  79   FIXME("(%s, %s): stub\n", bInstall?"TRUE":"FALSE",
  80         debugstr_w(cmdline));
  81
  82   return S_OK;
  83 }
  84
  85 /***********************************************************************
  86  *              DllCanUnloadNow (URLMON.@)
  87  */
  88 HRESULT WINAPI DllCanUnloadNow(void)
  89 {
  90     return URLMON_refCount != 0 ? S_FALSE : S_OK;
  91 }
  92
  93
  94
  95 /******************************************************************************
  96  * Urlmon ClassFactory
  97  */
  98 typedef struct {
  99     const IClassFactoryVtbl *lpClassFactoryVtbl;
 100
 101     HRESULT (*pfnCreateInstance)(IUnknown *pUnkOuter, LPVOID *ppObj);
 102 } ClassFactory;
 103
 104 #define CLASSFACTORY(x)  ((IClassFactory*)  &(x)->lpClassFactoryVtbl)
 105
 106 static HRESULT WINAPI CF_QueryInterface(IClassFactory *iface, REFIID riid, LPVOID *ppv)
 107 {
 108     *ppv = NULL;
 109
 110     if(IsEqualGUID(riid, &IID_IUnknown)) {
 111         TRACE("(%p)->(IID_IUnknown %p)\n", iface, ppv);
 112         *ppv = iface;
 113     }else if(IsEqualGUID(riid, &IID_IClassFactory)) {
 114         TRACE("(%p)->(IID_IClassFactory %p)\n", iface, ppv);
 115         *ppv = iface;
 116     }
 117
 118     if(*ppv) {
 119         IUnknown_AddRef((IUnknown*)*ppv);
 120         return S_OK;
 121     }
 122
 123     WARN("(%p)->(%s,%p),not found\n", iface, debugstr_guid(riid), ppv);
 124     return E_NOINTERFACE;
 125 }
 126
 127 static ULONG WINAPI CF_AddRef(IClassFactory *iface)
 128 {
 129     URLMON_LockModule();
 130     return 2;
 131 }
 132
 133 static ULONG WINAPI CF_Release(IClassFactory *iface)
 134 {
 135     URLMON_UnlockModule();
 136     return 1;
 137 }
 138
 139
 140 static HRESULT WINAPI CF_CreateInstance(IClassFactory *iface, IUnknown *pOuter,
 141                                         REFIID riid, LPVOID *ppobj)
 142 {
 143     ClassFactory *This = (ClassFactory*)iface;
 144     HRESULT hres;
 145     LPUNKNOWN punk;
 146
 147     TRACE("(%p)->(%p,%s,%p)\n",This,pOuter,debugstr_guid(riid),ppobj);
 148
 149     *ppobj = NULL;
 150     if(SUCCEEDED(hres = This->pfnCreateInstance(pOuter, (LPVOID *) &punk))) {
 151         hres = IUnknown_QueryInterface(punk, riid, ppobj);
 152         IUnknown_Release(punk);
 153     }
 154     return hres;
 155 }
 156
 157 static HRESULT WINAPI CF_LockServer(LPCLASSFACTORY iface,BOOL dolock)
 158 {
 159     TRACE("(%d)\n", dolock);
 160
 161     if (dolock)
 162            URLMON_LockModule();
 163     else
 164            URLMON_UnlockModule();
 165
 166     return S_OK;
 167 }
 168
 169 static const IClassFactoryVtbl ClassFactoryVtbl =
 170 {
 171     CF_QueryInterface,
 172     CF_AddRef,
 173     CF_Release,
 174     CF_CreateInstance,
 175     CF_LockServer
 176 };
 177
 178 static const ClassFactory FileProtocolCF =
 179     { &ClassFactoryVtbl, FileProtocol_Construct};
 180 static const ClassFactory FtpProtocolCF =
 181     { &ClassFactoryVtbl, FtpProtocol_Construct};
 182 static const ClassFactory HttpProtocolCF =
 183     { &ClassFactoryVtbl, HttpProtocol_Construct};
 184 static const ClassFactory MkProtocolCF =
 185     { &ClassFactoryVtbl, MkProtocol_Construct};
 186 static const ClassFactory SecurityManagerCF =
 187     { &ClassFactoryVtbl, SecManagerImpl_Construct};
 188 static const ClassFactory ZoneManagerCF =
 189     { &ClassFactoryVtbl, ZoneMgrImpl_Construct};
 190
 191 struct object_creation_info
 192 {
 193     const CLSID *clsid;
 194     IClassFactory *cf;
 195     LPCWSTR protocol;
 196 };
 197
 198 static const WCHAR wszFile[] = {'f','i','l','e',0};
 199 static const WCHAR wszFtp[]  = {'f','t','p',0};
 200 static const WCHAR wszHttp[] = {'h','t','t','p',0};
 201 static const WCHAR wszMk[]   = {'m','k',0};
 202
 203 static const struct object_creation_info object_creation[] =
 204 {
 205     { &CLSID_FileProtocol,            CLASSFACTORY(&FileProtocolCF),    wszFile },
 206     { &CLSID_FtpProtocol,             CLASSFACTORY(&FtpProtocolCF),     wszFtp  },
 207     { &CLSID_HttpProtocol,            CLASSFACTORY(&HttpProtocolCF),    wszHttp },
 208     { &CLSID_MkProtocol,              CLASSFACTORY(&MkProtocolCF),      wszMk },
 209     { &CLSID_InternetSecurityManager, CLASSFACTORY(&SecurityManagerCF), NULL    },
 210     { &CLSID_InternetZoneManager,     CLASSFACTORY(&ZoneManagerCF),     NULL    }
 211 };
 212
 213 static void init_session(BOOL init)
 214 {
 215     IInternetSession *session;
 216     int i;
 217
 218     CoInternetGetSession(0, &session, 0);
 219
 220     for(i=0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++) {
 221         if(object_creation[i].protocol) {
 222             if(init)
 223                 IInternetSession_RegisterNameSpace(session, object_creation[i].cf,
 224                         object_creation[i].clsid, object_creation[i].protocol, 0, NULL, 0);
 225             else
 226                 IInternetSession_UnregisterNameSpace(session, object_creation[i].cf,
 227                         object_creation[i].protocol);
 228         }
 229     }
 230
 231     IInternetSession_Release(session);
 232 }
 233
 234 /*******************************************************************************
 235  * DllGetClassObject [URLMON.@]
 236  * Retrieves class object from a DLL object
 237  *
 238  * NOTES
 239  *    Docs say returns STDAPI
 240  *
 241  * PARAMS
 242  *    rclsid [I] CLSID for the class object
 243  *    riid   [I] Reference to identifier of interface for class object
 244  *    ppv    [O] Address of variable to receive interface pointer for riid
 245  *
 246  * RETURNS
 247  *    Success: S_OK
 248  *    Failure: CLASS_E_CLASSNOTAVAILABLE, E_OUTOFMEMORY, E_INVALIDARG,
 249  *             E_UNEXPECTED
 250  */
 251
 252 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
 253 {
 254     int i;
 255
 256     TRACE("(%s,%s,%p)\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);
 257
 258     for (i=0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++)
 259     {
 260         if (IsEqualGUID(object_creation[i].clsid, rclsid))
 261             return IClassFactory_QueryInterface(object_creation[i].cf, riid, ppv);
 262     }
 263
 264     FIXME("%s: no class found.\n", debugstr_guid(rclsid));
 265     return CLASS_E_CLASSNOTAVAILABLE;
 266 }
 267
 268
 269 /***********************************************************************
 270  *              DllRegisterServerEx (URLMON.@)
 271  */
 272 HRESULT WINAPI DllRegisterServerEx(void)
 273 {
 274     FIXME("(void): stub\n");
 275
 276     return E_FAIL;
 277 }
 278
 279 /**************************************************************************
 280  *                 UrlMkSetSessionOption (URLMON.@)
 281  */
 282 HRESULT WINAPI UrlMkSetSessionOption(DWORD dwOption, LPVOID pBuffer, DWORD dwBufferLength,
 283                                         DWORD Reserved)
 284 {
 285     FIXME("(%#x, %p, %#x): stub\n", dwOption, pBuffer, dwBufferLength);
 286
 287     return S_OK;
 288 }
 289
 290 static const CHAR Agent[] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)";
 291
 292 /**************************************************************************
 293  *                 ObtainUserAgentString (URLMON.@)
 294  */
 295 HRESULT WINAPI ObtainUserAgentString(DWORD dwOption, LPSTR pcszUAOut, DWORD *cbSize)
 296 {
 297     FIXME("(%d, %p, %p): stub\n", dwOption, pcszUAOut, cbSize);
 298
 299     if(dwOption) {
 300       ERR("dwOption: %d, must be zero\n", dwOption);
 301     }
 302
 303     if (sizeof(Agent) < *cbSize)
 304         *cbSize = sizeof(Agent);
 305     lstrcpynA(pcszUAOut, Agent, *cbSize);
 306
 307     return S_OK;
 308 }
 309
 310 /**************************************************************************
 311  *                 IsValidURL (URLMON.@)
 312  *
 313  * Determines if a specified string is a valid URL.
 314  *
 315  * PARAMS
 316  *  pBC        [I] ignored, must be NULL.
 317  *  szURL      [I] string that represents the URL in question.
 318  *  dwReserved [I] reserved and must be zero.
 319  *
 320  * RETURNS
 321  *  Success: S_OK.
 322  *  Failure: S_FALSE.
 323  *  returns E_INVALIDARG if one or more of the args is invalid.
 324  *
 325  * TODO:
 326  *  test functionality against windows to see what a valid URL is.
 327  */
 328 HRESULT WINAPI IsValidURL(LPBC pBC, LPCWSTR szURL, DWORD dwReserved)
 329 {
 330     FIXME("(%p, %s, %d): stub\n", pBC, debugstr_w(szURL), dwReserved);
 331
 332     if (pBC != NULL || dwReserved != 0)
 333         return E_INVALIDARG;
 334
 335     return S_OK;
 336 }
 337
 338 /**************************************************************************
 339  *                 FaultInIEFeature (URLMON.@)
 340  *
 341  *  Undocumented.  Appears to be used by native shdocvw.dll.
 342  */
 343 HRESULT WINAPI FaultInIEFeature( HWND hwnd, uCLSSPEC * pClassSpec,
 344                                  QUERYCONTEXT *pQuery, DWORD flags )
 345 {
 346     FIXME("%p %p %p %08x\n", hwnd, pClassSpec, pQuery, flags);
 347     return E_NOTIMPL;
 348 }
 349
 350 /**************************************************************************
 351  *                 CoGetClassObjectFromURL (URLMON.@)
 352  */
 353 HRESULT WINAPI CoGetClassObjectFromURL( REFCLSID rclsid, LPCWSTR szCodeURL, DWORD dwFileVersionMS,
 354                                         DWORD dwFileVersionLS, LPCWSTR szContentType,
 355                                         LPBINDCTX pBindCtx, DWORD dwClsContext, LPVOID pvReserved,
 356                                         REFIID riid, LPVOID *ppv )
 357 {
 358     FIXME("(%s %s %d %d %s %p %d %p %s %p) Stub!\n", debugstr_guid(rclsid), debugstr_w(szCodeURL),
 359         dwFileVersionMS, dwFileVersionLS, debugstr_w(szContentType), pBindCtx, dwClsContext, pvReserved,
 360         debugstr_guid(riid), ppv);
 361     return E_NOINTERFACE;
 362 }
 363
 364 /***********************************************************************
 365  *           ReleaseBindInfo (URLMON.@)
 366  *
 367  * Release the resources used by the specified BINDINFO structure.
 368  *
 369  * PARAMS
 370  *  pbindinfo [I] BINDINFO to release.
 371  *
 372  * RETURNS
 373  *  Nothing.
 374  */
 375 void WINAPI ReleaseBindInfo(BINDINFO* pbindinfo)
 376 {
 377     DWORD size;
 378
 379     TRACE("(%p)\n", pbindinfo);
 380
 381     if(!pbindinfo || !(size = pbindinfo->cbSize))
 382         return;
 383
 384     CoTaskMemFree(pbindinfo->szExtraInfo);
 385     ReleaseStgMedium(&pbindinfo->stgmedData);
 386
 387     if(offsetof(BINDINFO, szExtraInfo) < size)
 388         CoTaskMemFree(pbindinfo->szCustomVerb);
 389
 390
 391     if(pbindinfo->pUnk && offsetof(BINDINFO, pUnk) < size)
 392         IUnknown_Release(pbindinfo->pUnk);
 393
 394     memset(pbindinfo, 0, size);
 395     pbindinfo->cbSize = size;
 396 }
 397
 398 /***********************************************************************
 399  *           FindMimeFromData (URLMON.@)
 400  *
 401  * Determines the Multipurpose Internet Mail Extensions (MIME) type from the data provided.
 402  */
 403 static BOOL text_html_filter(const BYTE *b, DWORD size)
 404 {
 405     int i;
 406
 407     if(size < 5)
 408         return FALSE;
 409
 410     for(i=0; i < size-5; i++) {
 411         if(b[i] == '<'
 412            && (b[i+1] == 'h' || b[i+1] == 'H')
 413            && (b[i+2] == 't' || b[i+2] == 'T')
 414            && (b[i+3] == 'm' || b[i+3] == 'M')
 415            && (b[i+4] == 'l' || b[i+4] == 'L'))
 416             return TRUE;
 417     }
 418
 419     return FALSE;
 420 }
 421
 422 static BOOL image_gif_filter(const BYTE *b, DWORD size)
 423 {
 424     return size >= 6
 425         && (b[0] == 'G' || b[0] == 'g')
 426         && (b[1] == 'I' || b[1] == 'i')
 427         && (b[2] == 'F' || b[2] == 'f')
 428         &&  b[3] == '8'
 429         && (b[4] == '7' || b[4] == '9')
 430         && (b[5] == 'A' || b[5] == 'a');
 431 }
 432
 433 static BOOL image_pjpeg_filter(const BYTE *b, DWORD size)
 434 {
 435     return size > 2 && b[0] == 0xff && b[1] == 0xd8;
 436 }
 437
 438 static BOOL image_tiff_filter(const BYTE *b, DWORD size)
 439 {
 440     return size > 2 && b[0] == 0x4d && b[1] == 0x4d;
 441 }
 442
 443 static BOOL image_xpng_filter(const BYTE *b, DWORD size)
 444 {
 445     static const BYTE xpng_header[] = {0x89,'P','N','G',0x0d,0x0a,0x1a,0x0a};
 446     return size > sizeof(xpng_header) && !memcmp(b, xpng_header, sizeof(xpng_header));
 447 }
 448
 449 static BOOL image_bmp_filter(const BYTE *b, DWORD size)
 450 {
 451     return size >= 14
 452         && b[0] == 0x42 && b[1] == 0x4d
 453         && *(const DWORD *)(b+6) == 0;
 454 }
 455
 456 static BOOL video_avi_filter(const BYTE *b, DWORD size)
 457 {
 458     return size > 12
 459         && b[0] == 'R' && b[1] == 'I' && b[2] == 'F' && b[3] == 'F'
 460         && b[8] == 'A' && b[9] == 'V' && b[10] == 'I' && b[11] == 0x20;
 461 }
 462
 463 static BOOL video_mpeg_filter(const BYTE *b, DWORD size)
 464 {
 465     return size > 4
 466         && !b[0] && !b[1] && b[2] == 0x01
 467         && (b[3] == 0xb3 || b[3] == 0xba);
 468 }
 469
 470 static BOOL application_pdf_filter(const BYTE *b, DWORD size)
 471 {
 472     return size > 4 && b[0] == 0x25 && b[1] == 0x50 && b[2] == 0x44 && b[3] == 0x46;
 473 }
 474
 475 static BOOL application_xzip_filter(const BYTE *b, DWORD size)
 476 {
 477     return size > 2 && b[0] == 0x50 && b[1] == 0x4b;
 478 }
 479
 480 static BOOL application_xgzip_filter(const BYTE *b, DWORD size)
 481 {
 482     return size > 2 && b[0] == 0x1f && b[1] == 0x8b;
 483 }
 484
 485 static BOOL application_java_filter(const BYTE *b, DWORD size)
 486 {
 487     return size > 4 && b[0] == 0xca && b[1] == 0xfe && b[2] == 0xba && b[3] == 0xbe;
 488 }
 489
 490 static BOOL application_xmsdownload(const BYTE *b, DWORD size)
 491 {
 492     return size > 2 && b[0] == 'M' && b[1] == 'Z';
 493 }
 494
 495 static BOOL text_plain_filter(const BYTE *b, DWORD size)
 496 {
 497     const BYTE *ptr;
 498
 499     for(ptr = b; ptr < b+size-1; ptr++) {
 500         if(*ptr < 0x20 && *ptr != '\n' && *ptr != '\r' && *ptr != '\t')
 501             return FALSE;
 502     }
 503
 504     return TRUE;
 505 }
 506
 507 static BOOL application_octet_stream_filter(const BYTE *b, DWORD size)
 508 {
 509     return TRUE;
 510 }
 511
 512 HRESULT WINAPI FindMimeFromData(LPBC pBC, LPCWSTR pwzUrl, LPVOID pBuffer,
 513         DWORD cbSize, LPCWSTR pwzMimeProposed, DWORD dwMimeFlags,
 514         LPWSTR* ppwzMimeOut, DWORD dwReserved)
 515 {
 516     TRACE("(%p,%s,%p,%d,%s,0x%x,%p,0x%x)\n", pBC, debugstr_w(pwzUrl), pBuffer, cbSize,
 517             debugstr_w(pwzMimeProposed), dwMimeFlags, ppwzMimeOut, dwReserved);
 518
 519     if(dwMimeFlags)
 520         WARN("dwMimeFlags=%08x\n", dwMimeFlags);
 521     if(dwReserved)
 522         WARN("dwReserved=%d\n", dwReserved);
 523
 524     /* pBC seams to not be used */
 525
 526     if(!ppwzMimeOut || (!pwzUrl && !pBuffer))
 527         return E_INVALIDARG;
 528
 529     if(pwzMimeProposed && (!pBuffer || (pBuffer && !cbSize))) {
 530         DWORD len;
 531
 532         if(!pwzMimeProposed)
 533             return E_FAIL;
 534
 535         len = strlenW(pwzMimeProposed)+1;
 536         *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 537         memcpy(*ppwzMimeOut, pwzMimeProposed, len*sizeof(WCHAR));
 538         return S_OK;
 539     }
 540
 541     if(pBuffer) {
 542         const BYTE *buf = pBuffer;
 543         DWORD len;
 544         LPCWSTR ret = NULL;
 545         int i;
 546
 547         static const WCHAR wszTextHtml[] = {'t','e','x','t','/','h','t','m','l',0};
 548         static const WCHAR wszImageGif[] = {'i','m','a','g','e','/','g','i','f',0};
 549         static const WCHAR wszImagePjpeg[] = {'i','m','a','g','e','/','p','j','p','e','g',0};
 550         static const WCHAR wszImageTiff[] = {'i','m','a','g','e','/','t','i','f','f',0};
 551         static const WCHAR wszImageXPng[] = {'i','m','a','g','e','/','x','-','p','n','g',0};
 552         static const WCHAR wszImageBmp[] = {'i','m','a','g','e','/','b','m','p',0};
 553         static const WCHAR wszVideoAvi[] = {'v','i','d','e','o','/','a','v','i',0};
 554         static const WCHAR wszVideoMpeg[] = {'v','i','d','e','o','/','m','p','e','g',0};
 555         static const WCHAR wszAppPdf[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 556             'p','d','f',0};
 557         static const WCHAR wszAppXZip[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 558             'x','-','z','i','p','-','c','o','m','p','r','e','s','s','e','d',0};
 559         static const WCHAR wszAppXGzip[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 560             'x','-','g','z','i','p','-','c','o','m','p','r','e','s','s','e','d',0};
 561         static const WCHAR wszAppJava[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 562             'j','a','v','a',0};
 563         static const WCHAR wszAppXMSDownload[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 564             'x','-','m','s','d','o','w','n','l','o','a','d',0};
 565         static const WCHAR wszTextPlain[] = {'t','e','x','t','/','p','l','a','i','n','\0'};
 566         static const WCHAR wszAppOctetStream[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 567             'o','c','t','e','t','-','s','t','r','e','a','m','\0'};
 568
 569         static const struct {
 570             LPCWSTR mime;
 571             BOOL (*filter)(const BYTE *,DWORD);
 572         } mime_filters[] = {
 573             {wszTextHtml,       text_html_filter},
 574             {wszImageGif,       image_gif_filter},
 575             {wszImagePjpeg,     image_pjpeg_filter},
 576             {wszImageTiff,      image_tiff_filter},
 577             {wszImageXPng,      image_xpng_filter},
 578             {wszImageBmp,       image_bmp_filter},
 579             {wszVideoAvi,       video_avi_filter},
 580             {wszVideoMpeg,      video_mpeg_filter},
 581             {wszAppPdf,         application_pdf_filter},
 582             {wszAppXZip,        application_xzip_filter},
 583             {wszAppXGzip,       application_xgzip_filter},
 584             {wszAppJava,        application_java_filter},
 585             {wszAppXMSDownload, application_xmsdownload},
 586             {wszTextPlain,      text_plain_filter},
 587             {wszAppOctetStream, application_octet_stream_filter}
 588         };
 589
 590         if(!cbSize)
 591             return E_FAIL;
 592
 593         if(pwzMimeProposed && strcmpW(pwzMimeProposed, wszAppOctetStream)) {
 594             for(i=0; i < sizeof(mime_filters)/sizeof(*mime_filters); i++) {
 595                 if(!strcmpW(pwzMimeProposed, mime_filters[i].mime))
 596                     break;
 597             }
 598
 599             if(i == sizeof(mime_filters)/sizeof(*mime_filters)
 600                     || mime_filters[i].filter(buf, cbSize)) {
 601                 len = strlenW(pwzMimeProposed)+1;
 602                 *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 603                 memcpy(*ppwzMimeOut, pwzMimeProposed, len*sizeof(WCHAR));
 604                 return S_OK;
 605             }
 606         }
 607
 608         i=0;
 609         while(!ret) {
 610             if(mime_filters[i].filter(buf, cbSize))
 611                 ret = mime_filters[i].mime;
 612             i++;
 613         }
 614
 615         TRACE("found %s for data\n"
 616               "%02x %02x %02x %02x  %02x %02x %02x %02x  %02x %02x %02x %02x  %02x %02x %02x %02x\n",
 617               debugstr_w(ret), buf[0],buf[1],buf[2],buf[3], buf[4],buf[5],buf[6],buf[7],
 618               buf[8],buf[9],buf[10],buf[11], buf[12],buf[13],buf[14],buf[15]);
 619
 620         if(pwzMimeProposed) {
 621             if(i == sizeof(mime_filters)/sizeof(*mime_filters))
 622                 ret = pwzMimeProposed;
 623
 624             /* text/html is a special case */
 625             if(!strcmpW(pwzMimeProposed, wszTextHtml) && !strcmpW(ret, wszTextPlain))
 626                 ret = wszTextHtml;
 627         }
 628
 629         len = strlenW(ret)+1;
 630         *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 631         memcpy(*ppwzMimeOut, ret, len*sizeof(WCHAR));
 632         return S_OK;
 633     }
 634
 635     if(pwzUrl) {
 636         HKEY hkey;
 637         DWORD res, size;
 638         LPCWSTR ptr;
 639         WCHAR mime[64];
 640
 641         static const WCHAR wszContentType[] =
 642                 {'C','o','n','t','e','n','t',' ','T','y','p','e','\0'};
 643
 644         ptr = strrchrW(pwzUrl, '.');
 645         if(!ptr)
 646             return E_FAIL;
 647
 648         res = RegOpenKeyW(HKEY_CLASSES_ROOT, ptr, &hkey);
 649         if(res != ERROR_SUCCESS)
 650             return HRESULT_FROM_WIN32(res);
 651
 652         size = sizeof(mime);
 653         res = RegQueryValueExW(hkey, wszContentType, NULL, NULL, (LPBYTE)mime, &size);
 654         RegCloseKey(hkey);
 655         if(res != ERROR_SUCCESS)
 656             return HRESULT_FROM_WIN32(res);
 657
 658         *ppwzMimeOut = CoTaskMemAlloc(size);
 659         memcpy(*ppwzMimeOut, mime, size);
 660         return S_OK;
 661     }
 662
 663     return E_FAIL;
 664 }
 665
 666 /***********************************************************************
 667  * Extract (URLMON.@)
 668  */
 669 HRESULT WINAPI Extract(void *dest, LPCSTR szCabName)
 670 {
 671     HRESULT (WINAPI *pExtract)(void *, LPCSTR);
 672
 673     if (!hCabinet)
 674         hCabinet = LoadLibraryA("cabinet.dll");
 675
 676     if (!hCabinet) return HRESULT_FROM_WIN32(GetLastError());
 677     pExtract = (void *)GetProcAddress(hCabinet, "Extract");
 678     if (!pExtract) return HRESULT_FROM_WIN32(GetLastError());
 679
 680     return pExtract(dest, szCabName);
 681 }