LCOV - code coverage report
Current view: directory - layout/build - nsContentDLF.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 153 0 0.0 %
Date: 2012-06-02 Functions: 14 0 0.0 %

       1                 : /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* vim: set ts=2 sw=2 et tw=78: */
       3                 : /* ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is Mozilla Communicator client code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      27                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : #include "nsCOMPtr.h"
      39                 : #include "nsContentDLF.h"
      40                 : #include "nsGenericHTMLElement.h"
      41                 : #include "nsGkAtoms.h"
      42                 : #include "nsIComponentManager.h"
      43                 : #include "nsIComponentRegistrar.h"
      44                 : #include "nsIContentViewer.h"
      45                 : #include "nsICategoryManager.h"
      46                 : #include "nsIDocumentLoaderFactory.h"
      47                 : #include "nsIDocument.h"
      48                 : #include "nsIURL.h"
      49                 : #include "nsNodeInfo.h"
      50                 : #include "nsNodeInfoManager.h"
      51                 : #include "nsIScriptSecurityManager.h"
      52                 : #include "nsString.h"
      53                 : #include "nsContentCID.h"
      54                 : #include "prprf.h"
      55                 : #include "nsNetUtil.h"
      56                 : #include "nsCRT.h"
      57                 : #include "nsIViewSourceChannel.h"
      58                 : #ifdef MOZ_MEDIA
      59                 : #include "nsHTMLMediaElement.h"
      60                 : #endif
      61                 : #include "nsContentUtils.h"
      62                 : #include "imgILoader.h"
      63                 : #include "nsIParser.h"
      64                 : #include "nsMimeTypes.h"
      65                 : 
      66                 : #include "mozilla/FunctionTimer.h"
      67                 : 
      68                 : // plugins
      69                 : #include "nsIPluginHost.h"
      70                 : #include "nsPluginHost.h"
      71                 : static NS_DEFINE_CID(kPluginDocumentCID, NS_PLUGINDOCUMENT_CID);
      72                 : 
      73                 : // Factory code for creating variations on html documents
      74                 : 
      75                 : #undef NOISY_REGISTRY
      76                 : 
      77                 : static NS_DEFINE_IID(kHTMLDocumentCID, NS_HTMLDOCUMENT_CID);
      78                 : static NS_DEFINE_IID(kXMLDocumentCID, NS_XMLDOCUMENT_CID);
      79                 : static NS_DEFINE_IID(kSVGDocumentCID, NS_SVGDOCUMENT_CID);
      80                 : #ifdef MOZ_MEDIA
      81                 : static NS_DEFINE_IID(kVideoDocumentCID, NS_VIDEODOCUMENT_CID);
      82                 : #endif
      83                 : static NS_DEFINE_IID(kImageDocumentCID, NS_IMAGEDOCUMENT_CID);
      84                 : static NS_DEFINE_IID(kXULDocumentCID, NS_XULDOCUMENT_CID);
      85                 : 
      86                 : nsresult
      87                 : NS_NewContentViewer(nsIContentViewer** aResult);
      88                 : 
      89                 : // XXXbz if you change the MIME types here, be sure to update
      90                 : // nsIParser.h and DetermineParseMode in nsParser.cpp and
      91                 : // nsHTMLDocument::StartDocumentLoad accordingly.
      92                 : static const char* const gHTMLTypes[] = {
      93                 :   TEXT_HTML,
      94                 :   TEXT_PLAIN,
      95                 :   TEXT_CSS,
      96                 :   TEXT_JAVASCRIPT,
      97                 :   TEXT_ECMASCRIPT,
      98                 :   APPLICATION_JAVASCRIPT,
      99                 :   APPLICATION_ECMASCRIPT,
     100                 :   APPLICATION_XJAVASCRIPT,
     101                 :   APPLICATION_JSON,
     102                 :   VIEWSOURCE_CONTENT_TYPE,
     103                 :   APPLICATION_XHTML_XML,
     104                 :   0
     105                 : };
     106                 :   
     107                 : static const char* const gXMLTypes[] = {
     108                 :   TEXT_XML,
     109                 :   APPLICATION_XML,
     110                 :   APPLICATION_MATHML_XML,
     111                 :   APPLICATION_RDF_XML,
     112                 :   TEXT_RDF,
     113                 :   0
     114                 : };
     115                 : 
     116                 : static const char* const gSVGTypes[] = {
     117                 :   IMAGE_SVG_XML,
     118                 :   0
     119                 : };
     120                 : 
     121                 : static const char* const gXULTypes[] = {
     122                 :   TEXT_XUL,
     123                 :   APPLICATION_CACHED_XUL,
     124                 :   0
     125                 : };
     126                 : 
     127                 : nsresult
     128               0 : NS_NewContentDocumentLoaderFactory(nsIDocumentLoaderFactory** aResult)
     129                 : {
     130               0 :   NS_PRECONDITION(aResult, "null OUT ptr");
     131               0 :   if (!aResult) {
     132               0 :     return NS_ERROR_NULL_POINTER;
     133                 :   }
     134               0 :   nsContentDLF* it = new nsContentDLF();
     135               0 :   if (!it) {
     136               0 :     return NS_ERROR_OUT_OF_MEMORY;
     137                 :   }
     138                 : 
     139               0 :   return CallQueryInterface(it, aResult);
     140                 : }
     141                 : 
     142               0 : nsContentDLF::nsContentDLF()
     143                 : {
     144               0 : }
     145                 : 
     146               0 : nsContentDLF::~nsContentDLF()
     147                 : {
     148               0 : }
     149                 : 
     150               0 : NS_IMPL_ISUPPORTS1(nsContentDLF,
     151                 :                    nsIDocumentLoaderFactory)
     152                 : 
     153                 : bool
     154               0 : MayUseXULXBL(nsIChannel* aChannel)
     155                 : {
     156                 :   nsIScriptSecurityManager *securityManager =
     157               0 :     nsContentUtils::GetSecurityManager();
     158               0 :   if (!securityManager) {
     159               0 :     return false;
     160                 :   }
     161                 : 
     162               0 :   nsCOMPtr<nsIPrincipal> principal;
     163               0 :   securityManager->GetChannelPrincipal(aChannel, getter_AddRefs(principal));
     164               0 :   NS_ENSURE_TRUE(principal, false);
     165                 : 
     166               0 :   return nsContentUtils::AllowXULXBLForPrincipal(principal);
     167                 : }
     168                 : 
     169                 : NS_IMETHODIMP
     170               0 : nsContentDLF::CreateInstance(const char* aCommand,
     171                 :                              nsIChannel* aChannel,
     172                 :                              nsILoadGroup* aLoadGroup,
     173                 :                              const char* aContentType, 
     174                 :                              nsISupports* aContainer,
     175                 :                              nsISupports* aExtraInfo,
     176                 :                              nsIStreamListener** aDocListener,
     177                 :                              nsIContentViewer** aDocViewer)
     178                 : {
     179                 : #ifdef NS_FUNCTION_TIMER
     180                 :   nsCAutoString channelURL__("N/A");
     181                 :   nsCOMPtr<nsIURI> url__;
     182                 :   if (aChannel && NS_SUCCEEDED(aChannel->GetURI(getter_AddRefs(url__)))) {
     183                 :     url__->GetSpec(channelURL__);
     184                 :   }
     185                 :   NS_TIME_FUNCTION_FMT("%s (line %d) (url: %s)", MOZ_FUNCTION_NAME,
     186                 :                        __LINE__, channelURL__.get());
     187                 : #endif
     188                 : 
     189                 :   // Declare "type" here.  This is because although the variable itself only
     190                 :   // needs limited scope, we need to use the raw string memory -- as returned
     191                 :   // by "type.get()" farther down in the function.
     192               0 :   nsCAutoString type;
     193                 : 
     194                 :   // Are we viewing source?
     195               0 :   nsCOMPtr<nsIViewSourceChannel> viewSourceChannel = do_QueryInterface(aChannel);
     196               0 :   if (viewSourceChannel)
     197                 :   {
     198               0 :     aCommand = "view-source";
     199                 : 
     200                 :     // The parser freaks out when it sees the content-type that a
     201                 :     // view-source channel normally returns.  Get the actual content
     202                 :     // type of the data.  If it's known, use it; otherwise use
     203                 :     // text/plain.
     204               0 :     viewSourceChannel->GetOriginalContentType(type);
     205               0 :     bool knownType = false;
     206                 :     PRInt32 typeIndex;
     207               0 :     for (typeIndex = 0; gHTMLTypes[typeIndex] && !knownType; ++typeIndex) {
     208               0 :       if (type.Equals(gHTMLTypes[typeIndex]) &&
     209               0 :           !type.EqualsLiteral(VIEWSOURCE_CONTENT_TYPE)) {
     210               0 :         knownType = true;
     211                 :       }
     212                 :     }
     213                 : 
     214               0 :     for (typeIndex = 0; gXMLTypes[typeIndex] && !knownType; ++typeIndex) {
     215               0 :       if (type.Equals(gXMLTypes[typeIndex])) {
     216               0 :         knownType = true;
     217                 :       }
     218                 :     }
     219                 : 
     220               0 :     for (typeIndex = 0; gSVGTypes[typeIndex] && !knownType; ++typeIndex) {
     221               0 :       if (type.Equals(gSVGTypes[typeIndex])) {
     222               0 :         knownType = true;
     223                 :       }
     224                 :     }
     225                 : 
     226               0 :     for (typeIndex = 0; gXULTypes[typeIndex] && !knownType; ++typeIndex) {
     227               0 :       if (type.Equals(gXULTypes[typeIndex])) {
     228               0 :         knownType = true;
     229                 :       }
     230                 :     }
     231                 : 
     232               0 :     if (knownType) {
     233               0 :       viewSourceChannel->SetContentType(type);
     234               0 :     } else if (IsImageContentType(type.get())) {
     235                 :       // If it's an image, we want to display it the same way we normally would.
     236                 :       // Also note the lifetime of "type" allows us to safely use "get()" here.
     237               0 :       aContentType = type.get();
     238                 :     } else {
     239               0 :       viewSourceChannel->SetContentType(NS_LITERAL_CSTRING(TEXT_PLAIN));
     240                 :     }
     241               0 :   } else if (0 == PL_strcmp(VIEWSOURCE_CONTENT_TYPE, aContentType)) {
     242               0 :     aChannel->SetContentType(NS_LITERAL_CSTRING(TEXT_PLAIN));
     243               0 :     aContentType = TEXT_PLAIN;
     244                 :   }
     245                 :   // Try html
     246               0 :   int typeIndex=0;
     247               0 :   while(gHTMLTypes[typeIndex]) {
     248               0 :     if (0 == PL_strcmp(gHTMLTypes[typeIndex++], aContentType)) {
     249                 :       return CreateDocument(aCommand, 
     250                 :                             aChannel, aLoadGroup,
     251                 :                             aContainer, kHTMLDocumentCID,
     252               0 :                             aDocListener, aDocViewer);
     253                 :     }
     254                 :   }
     255                 : 
     256                 :   // Try XML
     257               0 :   typeIndex = 0;
     258               0 :   while(gXMLTypes[typeIndex]) {
     259               0 :     if (0== PL_strcmp(gXMLTypes[typeIndex++], aContentType)) {
     260                 :       return CreateDocument(aCommand, 
     261                 :                             aChannel, aLoadGroup,
     262                 :                             aContainer, kXMLDocumentCID,
     263               0 :                             aDocListener, aDocViewer);
     264                 :     }
     265                 :   }
     266                 : 
     267                 :   // Try SVG
     268               0 :   typeIndex = 0;
     269               0 :   while(gSVGTypes[typeIndex]) {
     270               0 :     if (!PL_strcmp(gSVGTypes[typeIndex++], aContentType)) {
     271                 :       return CreateDocument(aCommand,
     272                 :                             aChannel, aLoadGroup,
     273                 :                             aContainer, kSVGDocumentCID,
     274               0 :                             aDocListener, aDocViewer);
     275                 :     }
     276                 :   }
     277                 : 
     278                 :   // Try XUL
     279               0 :   typeIndex = 0;
     280               0 :   while (gXULTypes[typeIndex]) {
     281               0 :     if (0 == PL_strcmp(gXULTypes[typeIndex++], aContentType)) {
     282               0 :       if (!MayUseXULXBL(aChannel)) {
     283               0 :         return NS_ERROR_REMOTE_XUL;
     284                 :       }
     285                 : 
     286                 :       return CreateXULDocument(aCommand,
     287                 :                                aChannel, aLoadGroup,
     288                 :                                aContentType, aContainer,
     289               0 :                                aExtraInfo, aDocListener, aDocViewer);
     290                 :     }
     291                 :   }
     292                 : 
     293                 : #ifdef MOZ_MEDIA
     294               0 :   if (nsHTMLMediaElement::ShouldHandleMediaType(aContentType)) {
     295                 :     return CreateDocument(aCommand, 
     296                 :                           aChannel, aLoadGroup,
     297                 :                           aContainer, kVideoDocumentCID,
     298               0 :                           aDocListener, aDocViewer);
     299                 :   }  
     300                 : #endif
     301                 : 
     302                 :   // Try image types
     303               0 :   if (IsImageContentType(aContentType)) {
     304                 :     return CreateDocument(aCommand, 
     305                 :                           aChannel, aLoadGroup,
     306                 :                           aContainer, kImageDocumentCID,
     307               0 :                           aDocListener, aDocViewer);
     308                 :   }
     309                 : 
     310               0 :   nsCOMPtr<nsIPluginHost> pluginHostCOM(do_GetService(MOZ_PLUGIN_HOST_CONTRACTID));
     311               0 :   nsPluginHost *pluginHost = static_cast<nsPluginHost*>(pluginHostCOM.get());
     312               0 :   if(pluginHost &&
     313               0 :      NS_SUCCEEDED(pluginHost->IsPluginEnabledForType(aContentType))) {
     314                 :     return CreateDocument(aCommand,
     315                 :                           aChannel, aLoadGroup,
     316                 :                           aContainer, kPluginDocumentCID,
     317               0 :                           aDocListener, aDocViewer);
     318                 :   }
     319                 : 
     320                 :   // If we get here, then we weren't able to create anything. Sorry!
     321               0 :   return NS_ERROR_FAILURE;
     322                 : }
     323                 : 
     324                 : 
     325                 : NS_IMETHODIMP
     326               0 : nsContentDLF::CreateInstanceForDocument(nsISupports* aContainer,
     327                 :                                         nsIDocument* aDocument,
     328                 :                                         const char *aCommand,
     329                 :                                         nsIContentViewer** aContentViewer)
     330                 : {
     331                 :   NS_TIME_FUNCTION;
     332                 : 
     333               0 :   nsCOMPtr<nsIContentViewer> contentViewer;
     334               0 :   nsresult rv = NS_NewContentViewer(getter_AddRefs(contentViewer));
     335               0 :   NS_ENSURE_SUCCESS(rv, rv);
     336                 : 
     337                 :   // Bind the document to the Content Viewer
     338               0 :   rv = contentViewer->LoadStart(aDocument);
     339               0 :   contentViewer.forget(aContentViewer);
     340               0 :   return rv;
     341                 : }
     342                 : 
     343                 : NS_IMETHODIMP
     344               0 : nsContentDLF::CreateBlankDocument(nsILoadGroup *aLoadGroup,
     345                 :                                   nsIPrincipal* aPrincipal,
     346                 :                                   nsIDocument **aDocument)
     347                 : {
     348                 :   NS_TIME_FUNCTION;
     349                 : 
     350               0 :   *aDocument = nsnull;
     351                 : 
     352               0 :   nsresult rv = NS_ERROR_FAILURE;
     353                 : 
     354                 :   // create a new blank HTML document
     355               0 :   nsCOMPtr<nsIDocument> blankDoc(do_CreateInstance(kHTMLDocumentCID));
     356                 : 
     357               0 :   if (blankDoc) {
     358                 :     // initialize
     359               0 :     nsCOMPtr<nsIURI> uri;
     360               0 :     NS_NewURI(getter_AddRefs(uri), NS_LITERAL_CSTRING("about:blank"));
     361               0 :     if (uri) {
     362               0 :       blankDoc->ResetToURI(uri, aLoadGroup, aPrincipal);
     363               0 :       rv = NS_OK;
     364                 :     }
     365                 :   }
     366                 : 
     367                 :   // add some simple content structure
     368               0 :   if (NS_SUCCEEDED(rv)) {
     369               0 :     rv = NS_ERROR_FAILURE;
     370                 : 
     371               0 :     nsNodeInfoManager *nim = blankDoc->NodeInfoManager();
     372                 : 
     373               0 :     nsCOMPtr<nsINodeInfo> htmlNodeInfo;
     374                 : 
     375                 :     // generate an html html element
     376                 :     htmlNodeInfo = nim->GetNodeInfo(nsGkAtoms::html, 0, kNameSpaceID_XHTML,
     377               0 :                                     nsIDOMNode::ELEMENT_NODE);
     378                 :     nsCOMPtr<nsIContent> htmlElement =
     379               0 :       NS_NewHTMLHtmlElement(htmlNodeInfo.forget());
     380                 : 
     381                 :     // generate an html head element
     382                 :     htmlNodeInfo = nim->GetNodeInfo(nsGkAtoms::head, 0, kNameSpaceID_XHTML,
     383               0 :                                     nsIDOMNode::ELEMENT_NODE);
     384                 :     nsCOMPtr<nsIContent> headElement =
     385               0 :       NS_NewHTMLHeadElement(htmlNodeInfo.forget());
     386                 : 
     387                 :     // generate an html body elemment
     388                 :     htmlNodeInfo = nim->GetNodeInfo(nsGkAtoms::body, 0, kNameSpaceID_XHTML,
     389               0 :                                     nsIDOMNode::ELEMENT_NODE);
     390                 :     nsCOMPtr<nsIContent> bodyElement =
     391               0 :       NS_NewHTMLBodyElement(htmlNodeInfo.forget());
     392                 : 
     393                 :     // blat in the structure
     394               0 :     if (htmlElement && headElement && bodyElement) {
     395               0 :       NS_ASSERTION(blankDoc->GetChildCount() == 0,
     396                 :                    "Shouldn't have children");
     397               0 :       rv = blankDoc->AppendChildTo(htmlElement, false);
     398               0 :       if (NS_SUCCEEDED(rv)) {
     399               0 :         rv = htmlElement->AppendChildTo(headElement, false);
     400                 : 
     401               0 :         if (NS_SUCCEEDED(rv)) {
     402                 :           // XXXbz Why not notifying here?
     403               0 :           htmlElement->AppendChildTo(bodyElement, false);
     404                 :         }
     405                 :       }
     406                 :     }
     407                 :   }
     408                 : 
     409                 :   // add a nice bow
     410               0 :   if (NS_SUCCEEDED(rv)) {
     411               0 :     blankDoc->SetDocumentCharacterSetSource(kCharsetFromDocTypeDefault);
     412               0 :     blankDoc->SetDocumentCharacterSet(NS_LITERAL_CSTRING("UTF-8"));
     413                 :     
     414               0 :     *aDocument = blankDoc;
     415               0 :     NS_ADDREF(*aDocument);
     416                 :   }
     417               0 :   return rv;
     418                 : }
     419                 : 
     420                 : 
     421                 : nsresult
     422               0 : nsContentDLF::CreateDocument(const char* aCommand,
     423                 :                              nsIChannel* aChannel,
     424                 :                              nsILoadGroup* aLoadGroup,
     425                 :                              nsISupports* aContainer,
     426                 :                              const nsCID& aDocumentCID,
     427                 :                              nsIStreamListener** aDocListener,
     428                 :                              nsIContentViewer** aContentViewer)
     429                 : {
     430                 :   NS_TIME_FUNCTION;
     431                 : 
     432               0 :   nsresult rv = NS_ERROR_FAILURE;
     433                 : 
     434               0 :   nsCOMPtr<nsIURI> aURL;
     435               0 :   rv = aChannel->GetURI(getter_AddRefs(aURL));
     436               0 :   if (NS_FAILED(rv)) return rv;
     437                 : 
     438                 : #ifdef NOISY_CREATE_DOC
     439                 :   if (nsnull != aURL) {
     440                 :     nsAutoString tmp;
     441                 :     aURL->ToString(tmp);
     442                 :     fputs(NS_LossyConvertUTF16toASCII(tmp).get(), stdout);
     443                 :     printf(": creating document\n");
     444                 :   }
     445                 : #endif
     446                 : 
     447                 :   // Create the document
     448               0 :   nsCOMPtr<nsIDocument> doc = do_CreateInstance(aDocumentCID, &rv);
     449               0 :   NS_ENSURE_SUCCESS(rv, rv);
     450                 : 
     451                 :   // Create the content viewer  XXX: could reuse content viewer here!
     452               0 :   nsCOMPtr<nsIContentViewer> contentViewer;
     453               0 :   rv = NS_NewContentViewer(getter_AddRefs(contentViewer));
     454               0 :   NS_ENSURE_SUCCESS(rv, rv);
     455                 : 
     456               0 :   doc->SetContainer(aContainer);
     457                 : 
     458                 :   // Initialize the document to begin loading the data.  An
     459                 :   // nsIStreamListener connected to the parser is returned in
     460                 :   // aDocListener.
     461               0 :   rv = doc->StartDocumentLoad(aCommand, aChannel, aLoadGroup, aContainer, aDocListener, true);
     462               0 :   NS_ENSURE_SUCCESS(rv, rv);
     463                 : 
     464                 :   // Bind the document to the Content Viewer
     465               0 :   rv = contentViewer->LoadStart(doc);
     466               0 :   contentViewer.forget(aContentViewer);
     467               0 :   return rv;
     468                 : }
     469                 : 
     470                 : nsresult
     471               0 : nsContentDLF::CreateXULDocument(const char* aCommand,
     472                 :                                 nsIChannel* aChannel,
     473                 :                                 nsILoadGroup* aLoadGroup,
     474                 :                                 const char* aContentType,
     475                 :                                 nsISupports* aContainer,
     476                 :                                 nsISupports* aExtraInfo,
     477                 :                                 nsIStreamListener** aDocListener,
     478                 :                                 nsIContentViewer** aContentViewer)
     479                 : {
     480                 :   NS_TIME_FUNCTION;
     481                 : 
     482                 :   nsresult rv;
     483               0 :   nsCOMPtr<nsIDocument> doc = do_CreateInstance(kXULDocumentCID, &rv);
     484               0 :   if (NS_FAILED(rv)) return rv;
     485                 : 
     486               0 :   nsCOMPtr<nsIContentViewer> contentViewer;
     487               0 :   rv = NS_NewContentViewer(getter_AddRefs(contentViewer));
     488               0 :   if (NS_FAILED(rv)) return rv;
     489                 : 
     490               0 :   nsCOMPtr<nsIURI> aURL;
     491               0 :   rv = aChannel->GetURI(getter_AddRefs(aURL));
     492               0 :   if (NS_FAILED(rv)) return rv;
     493                 : 
     494                 :   /* 
     495                 :    * Initialize the document to begin loading the data...
     496                 :    *
     497                 :    * An nsIStreamListener connected to the parser is returned in
     498                 :    * aDocListener.
     499                 :    */
     500                 : 
     501               0 :   doc->SetContainer(aContainer);
     502                 : 
     503               0 :   rv = doc->StartDocumentLoad(aCommand, aChannel, aLoadGroup, aContainer, aDocListener, true);
     504               0 :   if (NS_FAILED(rv)) return rv;
     505                 : 
     506                 :   /*
     507                 :    * Bind the document to the Content Viewer...
     508                 :    */
     509               0 :   rv = contentViewer->LoadStart(doc);
     510               0 :   contentViewer.forget(aContentViewer);
     511               0 :   return rv;
     512                 : }
     513                 : 
     514               0 : bool nsContentDLF::IsImageContentType(const char* aContentType) {
     515               0 :   nsCOMPtr<imgILoader> loader(do_GetService("@mozilla.org/image/loader;1"));
     516               0 :   bool isDecoderAvailable = false;
     517               0 :   loader->SupportImageWithMimeType(aContentType, &isDecoderAvailable);
     518               0 :   return isDecoderAvailable;
     519                 : }

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