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             {
 224                 IInternetSession_RegisterNameSpace(session, object_creation[i].cf,
 225                         object_creation[i].clsid, object_creation[i].protocol, 0, NULL, 0);
 226                 /* make sure that the AddRef on the class factory doesn't keep us loaded */
 227                 URLMON_UnlockModule();
 228             }
 229             else
 230             {
 231                 /* make sure that the Release on the class factory doesn't unload us */
 232                 URLMON_LockModule();
 233                 IInternetSession_UnregisterNameSpace(session, object_creation[i].cf,
 234                         object_creation[i].protocol);
 235             }
 236         }
 237     }
 238
 239     IInternetSession_Release(session);
 240 }
 241
 242 /*******************************************************************************
 243  * DllGetClassObject [URLMON.@]
 244  * Retrieves class object from a DLL object
 245  *
 246  * NOTES
 247  *    Docs say returns STDAPI
 248  *
 249  * PARAMS
 250  *    rclsid [I] CLSID for the class object
 251  *    riid   [I] Reference to identifier of interface for class object
 252  *    ppv    [O] Address of variable to receive interface pointer for riid
 253  *
 254  * RETURNS
 255  *    Success: S_OK
 256  *    Failure: CLASS_E_CLASSNOTAVAILABLE, E_OUTOFMEMORY, E_INVALIDARG,
 257  *             E_UNEXPECTED
 258  */
 259
 260 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
 261 {
 262     int i;
 263
 264     TRACE("(%s,%s,%p)\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);
 265
 266     for (i=0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++)
 267     {
 268         if (IsEqualGUID(object_creation[i].clsid, rclsid))
 269             return IClassFactory_QueryInterface(object_creation[i].cf, riid, ppv);
 270     }
 271
 272     FIXME("%s: no class found.\n", debugstr_guid(rclsid));
 273     return CLASS_E_CLASSNOTAVAILABLE;
 274 }
 275
 276
 277 /***********************************************************************
 278  *              DllRegisterServerEx (URLMON.@)
 279  */
 280 HRESULT WINAPI DllRegisterServerEx(void)
 281 {
 282     FIXME("(void): stub\n");
 283
 284     return E_FAIL;
 285 }
 286
 287 /**************************************************************************
 288  *                 UrlMkSetSessionOption (URLMON.@)
 289  */
 290 HRESULT WINAPI UrlMkSetSessionOption(DWORD dwOption, LPVOID pBuffer, DWORD dwBufferLength,
 291                                         DWORD Reserved)
 292 {
 293     FIXME("(%#x, %p, %#x): stub\n", dwOption, pBuffer, dwBufferLength);
 294
 295     return S_OK;
 296 }
 297
 298 static const CHAR Agent[] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)";
 299
 300 /**************************************************************************
 301  *                 ObtainUserAgentString (URLMON.@)
 302  */
 303 HRESULT WINAPI ObtainUserAgentString(DWORD dwOption, LPSTR pcszUAOut, DWORD *cbSize)
 304 {
 305     FIXME("(%d, %p, %p): stub\n", dwOption, pcszUAOut, cbSize);
 306
 307     if (pcszUAOut == NULL || cbSize == NULL)
 308         return E_INVALIDARG;
 309
 310     if (*cbSize < sizeof(Agent))
 311     {
 312         *cbSize = sizeof(Agent);
 313         return E_OUTOFMEMORY;
 314     }
 315
 316     if (sizeof(Agent) < *cbSize)
 317         *cbSize = sizeof(Agent);
 318     lstrcpynA(pcszUAOut, Agent, *cbSize);
 319
 320     return S_OK;
 321 }
 322
 323 /**************************************************************************
 324  *                 IsValidURL (URLMON.@)
 325  *
 326  * Determines if a specified string is a valid URL.
 327  *
 328  * PARAMS
 329  *  pBC        [I] ignored, must be NULL.
 330  *  szURL      [I] string that represents the URL in question.
 331  *  dwReserved [I] reserved and must be zero.
 332  *
 333  * RETURNS
 334  *  Success: S_OK.
 335  *  Failure: S_FALSE.
 336  *  returns E_INVALIDARG if one or more of the args is invalid.
 337  *
 338  * TODO:
 339  *  test functionality against windows to see what a valid URL is.
 340  */
 341 HRESULT WINAPI IsValidURL(LPBC pBC, LPCWSTR szURL, DWORD dwReserved)
 342 {
 343     FIXME("(%p, %s, %d): stub\n", pBC, debugstr_w(szURL), dwReserved);
 344
 345     if (pBC != NULL || dwReserved != 0)
 346         return E_INVALIDARG;
 347
 348     return S_OK;
 349 }
 350
 351 /**************************************************************************
 352  *                 FaultInIEFeature (URLMON.@)
 353  *
 354  *  Undocumented.  Appears to be used by native shdocvw.dll.
 355  */
 356 HRESULT WINAPI FaultInIEFeature( HWND hwnd, uCLSSPEC * pClassSpec,
 357                                  QUERYCONTEXT *pQuery, DWORD flags )
 358 {
 359     FIXME("%p %p %p %08x\n", hwnd, pClassSpec, pQuery, flags);
 360     return E_NOTIMPL;
 361 }
 362
 363 /**************************************************************************
 364  *                 CoGetClassObjectFromURL (URLMON.@)
 365  */
 366 HRESULT WINAPI CoGetClassObjectFromURL( REFCLSID rclsid, LPCWSTR szCodeURL, DWORD dwFileVersionMS,
 367                                         DWORD dwFileVersionLS, LPCWSTR szContentType,
 368                                         LPBINDCTX pBindCtx, DWORD dwClsContext, LPVOID pvReserved,
 369                                         REFIID riid, LPVOID *ppv )
 370 {
 371     FIXME("(%s %s %d %d %s %p %d %p %s %p) Stub!\n", debugstr_guid(rclsid), debugstr_w(szCodeURL),
 372         dwFileVersionMS, dwFileVersionLS, debugstr_w(szContentType), pBindCtx, dwClsContext, pvReserved,
 373         debugstr_guid(riid), ppv);
 374     return E_NOINTERFACE;
 375 }
 376
 377 /***********************************************************************
 378  *           ReleaseBindInfo (URLMON.@)
 379  *
 380  * Release the resources used by the specified BINDINFO structure.
 381  *
 382  * PARAMS
 383  *  pbindinfo [I] BINDINFO to release.
 384  *
 385  * RETURNS
 386  *  Nothing.
 387  */
 388 void WINAPI ReleaseBindInfo(BINDINFO* pbindinfo)
 389 {
 390     DWORD size;
 391
 392     TRACE("(%p)\n", pbindinfo);
 393
 394     if(!pbindinfo || !(size = pbindinfo->cbSize))
 395         return;
 396
 397     CoTaskMemFree(pbindinfo->szExtraInfo);
 398     ReleaseStgMedium(&pbindinfo->stgmedData);
 399
 400     if(offsetof(BINDINFO, szExtraInfo) < size)
 401         CoTaskMemFree(pbindinfo->szCustomVerb);
 402
 403
 404     if(pbindinfo->pUnk && offsetof(BINDINFO, pUnk) < size)
 405         IUnknown_Release(pbindinfo->pUnk);
 406
 407     memset(pbindinfo, 0, size);
 408     pbindinfo->cbSize = size;
 409 }
 410
 411 /***********************************************************************
 412  *           FindMimeFromData (URLMON.@)
 413  *
 414  * Determines the Multipurpose Internet Mail Extensions (MIME) type from the data provided.
 415  */
 416 static BOOL text_html_filter(const BYTE *b, DWORD size)
 417 {
 418     int i;
 419
 420     if(size < 5)
 421         return FALSE;
 422
 423     for(i=0; i < size-5; i++) {
 424         if(b[i] == '<'
 425            && (b[i+1] == 'h' || b[i+1] == 'H')
 426            && (b[i+2] == 't' || b[i+2] == 'T')
 427            && (b[i+3] == 'm' || b[i+3] == 'M')
 428            && (b[i+4] == 'l' || b[i+4] == 'L'))
 429             return TRUE;
 430     }
 431
 432     return FALSE;
 433 }
 434
 435 static BOOL image_gif_filter(const BYTE *b, DWORD size)
 436 {
 437     return size >= 6
 438         && (b[0] == 'G' || b[0] == 'g')
 439         && (b[1] == 'I' || b[1] == 'i')
 440         && (b[2] == 'F' || b[2] == 'f')
 441         &&  b[3] == '8'
 442         && (b[4] == '7' || b[4] == '9')
 443         && (b[5] == 'A' || b[5] == 'a');
 444 }
 445
 446 static BOOL image_pjpeg_filter(const BYTE *b, DWORD size)
 447 {
 448     return size > 2 && b[0] == 0xff && b[1] == 0xd8;
 449 }
 450
 451 static BOOL image_tiff_filter(const BYTE *b, DWORD size)
 452 {
 453     return size > 2 && b[0] == 0x4d && b[1] == 0x4d;
 454 }
 455
 456 static BOOL image_xpng_filter(const BYTE *b, DWORD size)
 457 {
 458     static const BYTE xpng_header[] = {0x89,'P','N','G',0x0d,0x0a,0x1a,0x0a};
 459     return size > sizeof(xpng_header) && !memcmp(b, xpng_header, sizeof(xpng_header));
 460 }
 461
 462 static BOOL image_bmp_filter(const BYTE *b, DWORD size)
 463 {
 464     return size >= 14
 465         && b[0] == 0x42 && b[1] == 0x4d
 466         && *(const DWORD *)(b+6) == 0;
 467 }
 468
 469 static BOOL video_avi_filter(const BYTE *b, DWORD size)
 470 {
 471     return size > 12
 472         && b[0] == 'R' && b[1] == 'I' && b[2] == 'F' && b[3] == 'F'
 473         && b[8] == 'A' && b[9] == 'V' && b[10] == 'I' && b[11] == 0x20;
 474 }
 475
 476 static BOOL video_mpeg_filter(const BYTE *b, DWORD size)
 477 {
 478     return size > 4
 479         && !b[0] && !b[1] && b[2] == 0x01
 480         && (b[3] == 0xb3 || b[3] == 0xba);
 481 }
 482
 483 static BOOL application_pdf_filter(const BYTE *b, DWORD size)
 484 {
 485     return size > 4 && b[0] == 0x25 && b[1] == 0x50 && b[2] == 0x44 && b[3] == 0x46;
 486 }
 487
 488 static BOOL application_xzip_filter(const BYTE *b, DWORD size)
 489 {
 490     return size > 2 && b[0] == 0x50 && b[1] == 0x4b;
 491 }
 492
 493 static BOOL application_xgzip_filter(const BYTE *b, DWORD size)
 494 {
 495     return size > 2 && b[0] == 0x1f && b[1] == 0x8b;
 496 }
 497
 498 static BOOL application_java_filter(const BYTE *b, DWORD size)
 499 {
 500     return size > 4 && b[0] == 0xca && b[1] == 0xfe && b[2] == 0xba && b[3] == 0xbe;
 501 }
 502
 503 static BOOL application_xmsdownload(const BYTE *b, DWORD size)
 504 {
 505     return size > 2 && b[0] == 'M' && b[1] == 'Z';
 506 }
 507
 508 static BOOL text_plain_filter(const BYTE *b, DWORD size)
 509 {
 510     const BYTE *ptr;
 511
 512     for(ptr = b; ptr < b+size-1; ptr++) {
 513         if(*ptr < 0x20 && *ptr != '\n' && *ptr != '\r' && *ptr != '\t')
 514             return FALSE;
 515     }
 516
 517     return TRUE;
 518 }
 519
 520 static BOOL application_octet_stream_filter(const BYTE *b, DWORD size)
 521 {
 522     return TRUE;
 523 }
 524
 525 HRESULT WINAPI FindMimeFromData(LPBC pBC, LPCWSTR pwzUrl, LPVOID pBuffer,
 526         DWORD cbSize, LPCWSTR pwzMimeProposed, DWORD dwMimeFlags,
 527         LPWSTR* ppwzMimeOut, DWORD dwReserved)
 528 {
 529     TRACE("(%p,%s,%p,%d,%s,0x%x,%p,0x%x)\n", pBC, debugstr_w(pwzUrl), pBuffer, cbSize,
 530             debugstr_w(pwzMimeProposed), dwMimeFlags, ppwzMimeOut, dwReserved);
 531
 532     if(dwMimeFlags)
 533         WARN("dwMimeFlags=%08x\n", dwMimeFlags);
 534     if(dwReserved)
 535         WARN("dwReserved=%d\n", dwReserved);
 536
 537     /* pBC seams to not be used */
 538
 539     if(!ppwzMimeOut || (!pwzUrl && !pBuffer))
 540         return E_INVALIDARG;
 541
 542     if(pwzMimeProposed && (!pBuffer || (pBuffer && !cbSize))) {
 543         DWORD len;
 544
 545         if(!pwzMimeProposed)
 546             return E_FAIL;
 547
 548         len = strlenW(pwzMimeProposed)+1;
 549         *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 550         memcpy(*ppwzMimeOut, pwzMimeProposed, len*sizeof(WCHAR));
 551         return S_OK;
 552     }
 553
 554     if(pBuffer) {
 555         const BYTE *buf = pBuffer;
 556         DWORD len;
 557         LPCWSTR ret = NULL;
 558         int i;
 559
 560         static const WCHAR wszTextHtml[] = {'t','e','x','t','/','h','t','m','l',0};
 561         static const WCHAR wszImageGif[] = {'i','m','a','g','e','/','g','i','f',0};
 562         static const WCHAR wszImagePjpeg[] = {'i','m','a','g','e','/','p','j','p','e','g',0};
 563         static const WCHAR wszImageTiff[] = {'i','m','a','g','e','/','t','i','f','f',0};
 564         static const WCHAR wszImageXPng[] = {'i','m','a','g','e','/','x','-','p','n','g',0};
 565         static const WCHAR wszImageBmp[] = {'i','m','a','g','e','/','b','m','p',0};
 566         static const WCHAR wszVideoAvi[] = {'v','i','d','e','o','/','a','v','i',0};
 567         static const WCHAR wszVideoMpeg[] = {'v','i','d','e','o','/','m','p','e','g',0};
 568         static const WCHAR wszAppPdf[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 569             'p','d','f',0};
 570         static const WCHAR wszAppXZip[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 571             'x','-','z','i','p','-','c','o','m','p','r','e','s','s','e','d',0};
 572         static const WCHAR wszAppXGzip[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 573             'x','-','g','z','i','p','-','c','o','m','p','r','e','s','s','e','d',0};
 574         static const WCHAR wszAppJava[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 575             'j','a','v','a',0};
 576         static const WCHAR wszAppXMSDownload[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 577             'x','-','m','s','d','o','w','n','l','o','a','d',0};
 578         static const WCHAR wszTextPlain[] = {'t','e','x','t','/','p','l','a','i','n','\0'};
 579         static const WCHAR wszAppOctetStream[] = {'a','p','p','l','i','c','a','t','i','o','n','/',
 580             'o','c','t','e','t','-','s','t','r','e','a','m','\0'};
 581
 582         static const struct {
 583             LPCWSTR mime;
 584             BOOL (*filter)(const BYTE *,DWORD);
 585         } mime_filters[] = {
 586             {wszTextHtml,       text_html_filter},
 587             {wszImageGif,       image_gif_filter},
 588             {wszImagePjpeg,     image_pjpeg_filter},
 589             {wszImageTiff,      image_tiff_filter},
 590             {wszImageXPng,      image_xpng_filter},
 591             {wszImageBmp,       image_bmp_filter},
 592             {wszVideoAvi,       video_avi_filter},
 593             {wszVideoMpeg,      video_mpeg_filter},
 594             {wszAppPdf,         application_pdf_filter},
 595             {wszAppXZip,        application_xzip_filter},
 596             {wszAppXGzip,       application_xgzip_filter},
 597             {wszAppJava,        application_java_filter},
 598             {wszAppXMSDownload, application_xmsdownload},
 599             {wszTextPlain,      text_plain_filter},
 600             {wszAppOctetStream, application_octet_stream_filter}
 601         };
 602
 603         if(!cbSize)
 604             return E_FAIL;
 605
 606         if(pwzMimeProposed && strcmpW(pwzMimeProposed, wszAppOctetStream)) {
 607             for(i=0; i < sizeof(mime_filters)/sizeof(*mime_filters); i++) {
 608                 if(!strcmpW(pwzMimeProposed, mime_filters[i].mime))
 609                     break;
 610             }
 611
 612             if(i == sizeof(mime_filters)/sizeof(*mime_filters)
 613                     || mime_filters[i].filter(buf, cbSize)) {
 614                 len = strlenW(pwzMimeProposed)+1;
 615                 *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 616                 memcpy(*ppwzMimeOut, pwzMimeProposed, len*sizeof(WCHAR));
 617                 return S_OK;
 618             }
 619         }
 620
 621         i=0;
 622         while(!ret) {
 623             if(mime_filters[i].filter(buf, cbSize))
 624                 ret = mime_filters[i].mime;
 625             i++;
 626         }
 627
 628         TRACE("found %s for data\n"
 629               "%02x %02x %02x %02x  %02x %02x %02x %02x  %02x %02x %02x %02x  %02x %02x %02x %02x\n",
 630               debugstr_w(ret), buf[0],buf[1],buf[2],buf[3], buf[4],buf[5],buf[6],buf[7],
 631               buf[8],buf[9],buf[10],buf[11], buf[12],buf[13],buf[14],buf[15]);
 632
 633         if(pwzMimeProposed) {
 634             if(i == sizeof(mime_filters)/sizeof(*mime_filters))
 635                 ret = pwzMimeProposed;
 636
 637             /* text/html is a special case */
 638             if(!strcmpW(pwzMimeProposed, wszTextHtml) && !strcmpW(ret, wszTextPlain))
 639                 ret = wszTextHtml;
 640         }
 641
 642         len = strlenW(ret)+1;
 643         *ppwzMimeOut = CoTaskMemAlloc(len*sizeof(WCHAR));
 644         memcpy(*ppwzMimeOut, ret, len*sizeof(WCHAR));
 645         return S_OK;
 646     }
 647
 648     if(pwzUrl) {
 649         HKEY hkey;
 650         DWORD res, size;
 651         LPCWSTR ptr;
 652         WCHAR mime[64];
 653
 654         static const WCHAR wszContentType[] =
 655                 {'C','o','n','t','e','n','t',' ','T','y','p','e','\0'};
 656
 657         ptr = strrchrW(pwzUrl, '.');
 658         if(!ptr)
 659             return E_FAIL;
 660
 661         res = RegOpenKeyW(HKEY_CLASSES_ROOT, ptr, &hkey);
 662         if(res != ERROR_SUCCESS)
 663             return HRESULT_FROM_WIN32(res);
 664
 665         size = sizeof(mime);
 666         res = RegQueryValueExW(hkey, wszContentType, NULL, NULL, (LPBYTE)mime, &size);
 667         RegCloseKey(hkey);
 668         if(res != ERROR_SUCCESS)
 669             return HRESULT_FROM_WIN32(res);
 670
 671         *ppwzMimeOut = CoTaskMemAlloc(size);
 672         memcpy(*ppwzMimeOut, mime, size);
 673         return S_OK;
 674     }
 675
 676     return E_FAIL;
 677 }
 678
 679 /***********************************************************************
 680  * Extract (URLMON.@)
 681  */
 682 HRESULT WINAPI Extract(void *dest, LPCSTR szCabName)
 683 {
 684     HRESULT (WINAPI *pExtract)(void *, LPCSTR);
 685
 686     if (!hCabinet)
 687         hCabinet = LoadLibraryA("cabinet.dll");
 688
 689     if (!hCabinet) return HRESULT_FROM_WIN32(GetLastError());
 690     pExtract = (void *)GetProcAddress(hCabinet, "Extract");
 691     if (!pExtract) return HRESULT_FROM_WIN32(GetLastError());
 692
 693     return pExtract(dest, szCabName);
 694 }