Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 840 insertions, 0 deletions

diff --git a/Source/WebCore/loader/DocumentLoader.cpp b/Source/WebCore/loader/DocumentLoader.cpp
new file mode 100644
index 0000000..4e7c656
--- /dev/null
+++ b/Source/WebCore/loader/DocumentLoader.cpp
@@ -0,0 +1,840 @@
+/*
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "DocumentLoader.h"
+
+#include "ApplicationCacheHost.h"
+#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
+#include "ArchiveFactory.h"
+#include "ArchiveResourceCollection.h"
+#else
+#include "SubstituteResource.h"
+#endif
+#include "CachedPage.h"
+#include "CachedResourceLoader.h"
+#include "DOMWindow.h"
+#include "Document.h"
+#include "DocumentParser.h"
+#include "Event.h"
+#include "Frame.h"
+#include "FrameLoader.h"
+#include "FrameLoaderClient.h"
+#include "FrameTree.h"
+#include "HistoryItem.h"
+#include "Logging.h"
+#include "MainResourceLoader.h"
+#include "Page.h"
+#include "PlatformString.h"
+#include "Settings.h"
+#include "SharedBuffer.h"
+
+#include <wtf/Assertions.h>
+#include <wtf/text/CString.h>
+#include <wtf/unicode/Unicode.h>
+
+namespace WebCore {
+
+static void cancelAll(const ResourceLoaderSet& loaders)
+{
+    Vector<RefPtr<ResourceLoader> > loadersCopy;
+    copyToVector(loaders, loadersCopy);
+    size_t size = loadersCopy.size();
+    for (size_t i = 0; i < size; ++i)
+        loadersCopy[i]->cancel();
+}
+
+static void setAllDefersLoading(const ResourceLoaderSet& loaders, bool defers)
+{
+    Vector<RefPtr<ResourceLoader> > loadersCopy;
+    copyToVector(loaders, loadersCopy);
+    size_t size = loadersCopy.size();
+    for (size_t i = 0; i < size; ++i)
+        loadersCopy[i]->setDefersLoading(defers);
+}
+
+DocumentLoader::DocumentLoader(const ResourceRequest& req, const SubstituteData& substituteData)
+    : m_deferMainResourceDataLoad(true)
+    , m_frame(0)
+    , m_originalRequest(req)
+    , m_substituteData(substituteData)
+    , m_originalRequestCopy(req)
+    , m_request(req)
+    , m_committed(false)
+    , m_isStopping(false)
+    , m_loading(false)
+    , m_gotFirstByte(false)
+    , m_primaryLoadComplete(false)
+    , m_isClientRedirect(false)
+    , m_wasOnloadHandled(false)
+    , m_stopRecordingResponses(false)
+    , m_substituteResourceDeliveryTimer(this, &DocumentLoader::substituteResourceDeliveryTimerFired)
+    , m_didCreateGlobalHistoryEntry(false)
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+    , m_applicationCacheHost(adoptPtr(new ApplicationCacheHost(this)))
+#endif
+{
+}
+
+FrameLoader* DocumentLoader::frameLoader() const
+{
+    if (!m_frame)
+        return 0;
+    return m_frame->loader();
+}
+
+DocumentLoader::~DocumentLoader()
+{
+    ASSERT(!m_frame || frameLoader()->activeDocumentLoader() != this || !frameLoader()->isLoading());
+}
+
+PassRefPtr<SharedBuffer> DocumentLoader::mainResourceData() const
+{
+    if (m_mainResourceData)
+        return m_mainResourceData;
+    if (m_mainResourceLoader)
+        return m_mainResourceLoader->resourceData();
+    return 0;
+}
+
+const ResourceRequest& DocumentLoader::originalRequest() const
+{
+    return m_originalRequest;
+}
+
+const ResourceRequest& DocumentLoader::originalRequestCopy() const
+{
+    return m_originalRequestCopy;
+}
+
+const ResourceRequest& DocumentLoader::request() const
+{
+    return m_request;
+}
+
+ResourceRequest& DocumentLoader::request()
+{
+    return m_request;
+}
+
+const KURL& DocumentLoader::url() const
+{
+    return request().url();
+}
+
+void DocumentLoader::replaceRequestURLForSameDocumentNavigation(const KURL& url)
+{
+    m_originalRequestCopy.setURL(url);
+    m_request.setURL(url);
+}
+
+void DocumentLoader::setRequest(const ResourceRequest& req)
+{
+    // Replacing an unreachable URL with alternate content looks like a server-side
+    // redirect at this point, but we can replace a committed dataSource.
+    bool handlingUnreachableURL = false;
+
+    handlingUnreachableURL = m_substituteData.isValid() && !m_substituteData.failingURL().isEmpty();
+
+    if (handlingUnreachableURL)
+        m_committed = false;
+
+    // We should never be getting a redirect callback after the data
+    // source is committed, except in the unreachable URL case. It 
+    // would be a WebFoundation bug if it sent a redirect callback after commit.
+    ASSERT(!m_committed);
+
+    KURL oldURL = m_request.url();
+    m_request = req;
+
+    // Only send webView:didReceiveServerRedirectForProvisionalLoadForFrame: if URL changed.
+    // Also, don't send it when replacing unreachable URLs with alternate content.
+    if (!handlingUnreachableURL && oldURL != req.url())
+        frameLoader()->didReceiveServerRedirectForProvisionalLoadForFrame();
+}
+
+void DocumentLoader::setMainDocumentError(const ResourceError& error)
+{
+    m_mainDocumentError = error;    
+    frameLoader()->setMainDocumentError(this, error);
+ }
+
+void DocumentLoader::clearErrors()
+{
+    m_mainDocumentError = ResourceError();
+}
+
+void DocumentLoader::mainReceivedError(const ResourceError& error, bool isComplete)
+{
+    ASSERT(!error.isNull());
+
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+    m_applicationCacheHost->failedLoadingMainResource();
+#endif
+    
+    if (!frameLoader())
+        return;
+    setMainDocumentError(error);
+    if (isComplete)
+        frameLoader()->mainReceivedCompleteError(this, error);
+}
+
+// Cancels the data source's pending loads.  Conceptually, a data source only loads
+// one document at a time, but one document may have many related resources. 
+// stopLoading will stop all loads initiated by the data source, 
+// but not loads initiated by child frames' data sources -- that's the WebFrame's job.
+void DocumentLoader::stopLoading(DatabasePolicy databasePolicy)
+{
+    // In some rare cases, calling FrameLoader::stopLoading could set m_loading to false.
+    // (This can happen when there's a single XMLHttpRequest currently loading and stopLoading causes it
+    // to stop loading. Because of this, we need to save it so we don't return early.
+    bool loading = m_loading;
+    
+    if (m_committed) {
+        // Attempt to stop the frame if the document loader is loading, or if it is done loading but
+        // still  parsing. Failure to do so can cause a world leak.
+        Document* doc = m_frame->document();
+        
+        if (loading || doc->parsing())
+            m_frame->loader()->stopLoading(UnloadEventPolicyNone, databasePolicy);
+    }
+
+    // Always cancel multipart loaders
+    cancelAll(m_multipartSubresourceLoaders);
+
+    // Appcache uses ResourceHandle directly, DocumentLoader doesn't count these loads.
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+    m_applicationCacheHost->stopLoadingInFrame(m_frame);
+#endif
+
+    if (!loading)
+        return;
+    
+    RefPtr<Frame> protectFrame(m_frame);
+    RefPtr<DocumentLoader> protectLoader(this);
+
+    m_isStopping = true;
+
+    FrameLoader* frameLoader = DocumentLoader::frameLoader();
+    
+    if (m_mainResourceLoader)
+        // Stop the main resource loader and let it send the cancelled message.
+        m_mainResourceLoader->cancel();
+    else if (!m_subresourceLoaders.isEmpty())
+        // The main resource loader already finished loading. Set the cancelled error on the 
+        // document and let the subresourceLoaders send individual cancelled messages below.
+        setMainDocumentError(frameLoader->cancelledError(m_request));
+    else
+        // If there are no resource loaders, we need to manufacture a cancelled message.
+        // (A back/forward navigation has no resource loaders because its resources are cached.)
+        mainReceivedError(frameLoader->cancelledError(m_request), true);
+    
+    stopLoadingSubresources();
+    stopLoadingPlugIns();
+    
+    m_isStopping = false;
+}
+
+void DocumentLoader::setupForReplace()
+{
+    frameLoader()->setupForReplace();
+    m_committed = false;
+}
+
+void DocumentLoader::commitIfReady()
+{
+    if (m_gotFirstByte && !m_committed) {
+        m_committed = true;
+        frameLoader()->commitProvisionalLoad();
+    }
+}
+
+void DocumentLoader::finishedLoading()
+{
+    m_gotFirstByte = true;   
+    commitIfReady();
+    if (FrameLoader* loader = frameLoader()) {
+        loader->finishedLoadingDocument(this);
+        loader->writer()->end();
+    }
+}
+
+void DocumentLoader::commitLoad(const char* data, int length)
+{
+    // Both unloading the old page and parsing the new page may execute JavaScript which destroys the datasource
+    // by starting a new load, so retain temporarily.
+    RefPtr<DocumentLoader> protect(this);
+
+    commitIfReady();
+    FrameLoader* frameLoader = DocumentLoader::frameLoader();
+    if (!frameLoader)
+        return;
+#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
+    if (ArchiveFactory::isArchiveMimeType(response().mimeType()))
+        return;
+#endif
+    frameLoader->client()->committedLoad(this, data, length);
+}
+
+void DocumentLoader::commitData(const char* bytes, int length)
+{
+    // Set the text encoding.  This is safe to call multiple times.
+    bool userChosen = true;
+    String encoding = overrideEncoding();
+    if (encoding.isNull()) {
+        userChosen = false;
+        encoding = response().textEncodingName();
+    }
+    // FIXME: DocumentWriter should be owned by DocumentLoader.
+    m_frame->loader()->writer()->setEncoding(encoding, userChosen);
+    ASSERT(m_frame->document()->parsing());
+    m_frame->loader()->writer()->addData(bytes, length);
+}
+
+bool DocumentLoader::doesProgressiveLoad(const String& MIMEType) const
+{
+    return !frameLoader()->isReplacing() || MIMEType == "text/html";
+}
+
+void DocumentLoader::receivedData(const char* data, int length)
+{    
+    m_gotFirstByte = true;
+    if (doesProgressiveLoad(m_response.mimeType()))
+        commitLoad(data, length);
+}
+
+void DocumentLoader::setupForReplaceByMIMEType(const String& newMIMEType)
+{
+    if (!m_gotFirstByte)
+        return;
+    
+    String oldMIMEType = m_response.mimeType();
+    
+    if (!doesProgressiveLoad(oldMIMEType)) {
+        frameLoader()->revertToProvisional(this);
+        setupForReplace();
+        RefPtr<SharedBuffer> resourceData = mainResourceData();
+        commitLoad(resourceData->data(), resourceData->size());
+    }
+    
+    frameLoader()->finishedLoadingDocument(this);
+    m_frame->loader()->writer()->end();
+    
+    frameLoader()->setReplacing();
+    m_gotFirstByte = false;
+    
+    if (doesProgressiveLoad(newMIMEType)) {
+        frameLoader()->revertToProvisional(this);
+        setupForReplace();
+    }
+    
+    stopLoadingSubresources();
+    stopLoadingPlugIns();
+#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
+    clearArchiveResources();
+#endif
+}
+
+void DocumentLoader::updateLoading()
+{
+    if (!m_frame) {
+        setLoading(false);
+        return;
+    }
+    ASSERT(this == frameLoader()->activeDocumentLoader());
+    bool wasLoading = m_loading;
+    setLoading(frameLoader()->isLoading());
+
+    if (wasLoading && !m_loading) {
+        if (DOMWindow* window = m_frame->existingDOMWindow())
+            window->finishedLoading();
+    }
+}
+
+void DocumentLoader::setFrame(Frame* frame)
+{
+    if (m_frame == frame)
+        return;
+    ASSERT(frame && !m_frame);
+    m_frame = frame;
+    attachToFrame();
+}
+
+void DocumentLoader::attachToFrame()
+{
+    ASSERT(m_frame);
+}
+
+void DocumentLoader::detachFromFrame()
+{
+    ASSERT(m_frame);
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+    m_applicationCacheHost->setDOMApplicationCache(0);
+#endif
+    m_frame = 0;
+}
+
+void DocumentLoader::prepareForLoadStart()
+{
+    ASSERT(!m_isStopping);
+    setPrimaryLoadComplete(false);
+    ASSERT(frameLoader());
+    clearErrors();
+    
+    setLoading(true);
+    
+    frameLoader()->prepareForLoadStart();
+}
+
+void DocumentLoader::setPrimaryLoadComplete(bool flag)
+{
+    m_primaryLoadComplete = flag;
+    if (flag) {
+        if (m_mainResourceLoader) {
+            m_mainResourceData = m_mainResourceLoader->resourceData();
+            m_mainResourceLoader = 0;
+        }
+
+        if (this == frameLoader()->activeDocumentLoader())
+            updateLoading();
+    }
+}
+
+bool DocumentLoader::isLoadingInAPISense() const
+{
+    // Once a frame has loaded, we no longer need to consider subresources,
+    // but we still need to consider subframes.
+    if (frameLoader()->state() != FrameStateComplete) {
+        if (!m_primaryLoadComplete && isLoading())
+            return true;
+        if (!m_subresourceLoaders.isEmpty())
+            return true;
+        Document* doc = m_frame->document();
+        if (doc->cachedResourceLoader()->requestCount())
+            return true;
+        if (DocumentParser* parser = doc->parser())
+            if (parser->processingData())
+                return true;
+    }
+    return frameLoader()->subframeIsLoading();
+}
+
+#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
+void DocumentLoader::addAllArchiveResources(Archive* archive)
+{
+    if (!m_archiveResourceCollection)
+        m_archiveResourceCollection = adoptPtr(new ArchiveResourceCollection);
+        
+    ASSERT(archive);
+    if (!archive)
+        return;
+        
+    m_archiveResourceCollection->addAllResources(archive);
+}
+
+// FIXME: Adding a resource directly to a DocumentLoader/ArchiveResourceCollection seems like bad design, but is API some apps rely on.
+// Can we change the design in a manner that will let us deprecate that API without reducing functionality of those apps?
+void DocumentLoader::addArchiveResource(PassRefPtr<ArchiveResource> resource)
+{
+    if (!m_archiveResourceCollection)
+        m_archiveResourceCollection = adoptPtr(new ArchiveResourceCollection);
+        
+    ASSERT(resource);
+    if (!resource)
+        return;
+        
+    m_archiveResourceCollection->addResource(resource);
+}
+
+ArchiveResource* DocumentLoader::archiveResourceForURL(const KURL& url) const
+{
+    if (!m_archiveResourceCollection)
+        return 0;
+        
+    ArchiveResource* resource = m_archiveResourceCollection->archiveResourceForURL(url);
+
+    return resource && !resource->shouldIgnoreWhenUnarchiving() ? resource : 0;
+}
+
+PassRefPtr<Archive> DocumentLoader::popArchiveForSubframe(const String& frameName)
+{
+    return m_archiveResourceCollection ? m_archiveResourceCollection->popSubframeArchive(frameName) : 0;
+}
+
+void DocumentLoader::clearArchiveResources()
+{
+    m_archiveResourceCollection.clear();
+    m_substituteResourceDeliveryTimer.stop();
+}
+
+void DocumentLoader::setParsedArchiveData(PassRefPtr<SharedBuffer> data)
+{
+    m_parsedArchiveData = data;
+}
+
+SharedBuffer* DocumentLoader::parsedArchiveData() const
+{
+    return m_parsedArchiveData.get();
+}
+
+PassRefPtr<ArchiveResource> DocumentLoader::mainResource() const
+{
+    const ResourceResponse& r = response();
+    RefPtr<SharedBuffer> mainResourceBuffer = mainResourceData();
+    if (!mainResourceBuffer)
+        mainResourceBuffer = SharedBuffer::create();
+        
+    return ArchiveResource::create(mainResourceBuffer, r.url(), r.mimeType(), r.textEncodingName(), frame()->tree()->uniqueName());
+}
+
+PassRefPtr<ArchiveResource> DocumentLoader::subresource(const KURL& url) const
+{
+    if (!isCommitted())
+        return 0;
+    
+    CachedResource* resource = m_frame->document()->cachedResourceLoader()->cachedResource(url);
+    if (!resource || !resource->isLoaded())
+        return archiveResourceForURL(url);
+
+    // FIXME: This has the side effect of making the resource non-purgeable.
+    // It would be better if it didn't have this permanent effect.
+    if (!resource->makePurgeable(false))
+        return 0;
+
+    RefPtr<SharedBuffer> data = resource->data();
+    if (!data)
+        return 0;
+
+    return ArchiveResource::create(data.release(), url, resource->response());
+}
+
+void DocumentLoader::getSubresources(Vector<PassRefPtr<ArchiveResource> >& subresources) const
+{
+    if (!isCommitted())
+        return;
+
+    Document* document = m_frame->document();
+
+    const CachedResourceLoader::DocumentResourceMap& allResources = document->cachedResourceLoader()->allCachedResources();
+    CachedResourceLoader::DocumentResourceMap::const_iterator end = allResources.end();
+    for (CachedResourceLoader::DocumentResourceMap::const_iterator it = allResources.begin(); it != end; ++it) {
+        RefPtr<ArchiveResource> subresource = this->subresource(KURL(ParsedURLString, it->second->url()));
+        if (subresource)
+            subresources.append(subresource.release());
+    }
+
+    return;
+}
+#endif
+
+void DocumentLoader::deliverSubstituteResourcesAfterDelay()
+{
+    if (m_pendingSubstituteResources.isEmpty())
+        return;
+    ASSERT(m_frame && m_frame->page());
+    if (m_frame->page()->defersLoading())
+        return;
+    if (!m_substituteResourceDeliveryTimer.isActive())
+        m_substituteResourceDeliveryTimer.startOneShot(0);
+}
+
+void DocumentLoader::substituteResourceDeliveryTimerFired(Timer<DocumentLoader>*)
+{
+    if (m_pendingSubstituteResources.isEmpty())
+        return;
+    ASSERT(m_frame && m_frame->page());
+    if (m_frame->page()->defersLoading())
+        return;
+
+    SubstituteResourceMap copy;
+    copy.swap(m_pendingSubstituteResources);
+
+    SubstituteResourceMap::const_iterator end = copy.end();
+    for (SubstituteResourceMap::const_iterator it = copy.begin(); it != end; ++it) {
+        RefPtr<ResourceLoader> loader = it->first;
+        SubstituteResource* resource = it->second.get();
+        
+        if (resource) {
+            SharedBuffer* data = resource->data();
+        
+            loader->didReceiveResponse(resource->response());
+            loader->didReceiveData(data->data(), data->size(), data->size(), true);
+            loader->didFinishLoading(0);
+        } else {
+            // A null resource means that we should fail the load.
+            // FIXME: Maybe we should use another error here - something like "not in cache".
+            loader->didFail(loader->cannotShowURLError());
+        }
+    }
+}
+
+#ifndef NDEBUG
+bool DocumentLoader::isSubstituteLoadPending(ResourceLoader* loader) const
+{
+    return m_pendingSubstituteResources.contains(loader);
+}
+#endif
+
+void DocumentLoader::cancelPendingSubstituteLoad(ResourceLoader* loader)
+{
+    if (m_pendingSubstituteResources.isEmpty())
+        return;
+    m_pendingSubstituteResources.remove(loader);
+    if (m_pendingSubstituteResources.isEmpty())
+        m_substituteResourceDeliveryTimer.stop();
+}
+
+#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
+bool DocumentLoader::scheduleArchiveLoad(ResourceLoader* loader, const ResourceRequest& request, const KURL& originalURL)
+{
+    ArchiveResource* resource = 0;
+    
+    if (request.url() == originalURL)
+        resource = archiveResourceForURL(originalURL);
+
+    if (!resource) {
+        // WebArchiveDebugMode means we fail loads instead of trying to fetch them from the network if they're not in the archive.
+        bool shouldFailLoad = m_frame->settings()->webArchiveDebugModeEnabled() && ArchiveFactory::isArchiveMimeType(responseMIMEType());
+
+        if (!shouldFailLoad)
+            return false;
+    }
+    
+    m_pendingSubstituteResources.set(loader, resource);
+    deliverSubstituteResourcesAfterDelay();
+    
+    return true;
+}
+#endif
+
+void DocumentLoader::addResponse(const ResourceResponse& r)
+{
+    if (!m_stopRecordingResponses)
+        m_responses.append(r);
+}
+
+void DocumentLoader::stopRecordingResponses()
+{
+    m_stopRecordingResponses = true;
+}
+
+void DocumentLoader::setTitle(const String& title)
+{
+    if (title.isEmpty())
+        return;
+
+    if (m_pageTitle != title) {
+        frameLoader()->willChangeTitle(this);
+        m_pageTitle = title;
+        frameLoader()->didChangeTitle(this);
+    }
+}
+
+void DocumentLoader::setIconURL(const String& iconURL)
+{
+    if (iconURL.isEmpty())
+        return;
+
+    if (m_pageIconURL != iconURL) {
+        m_pageIconURL = iconURL;
+        frameLoader()->didChangeIcons(this);
+    }
+}
+
+KURL DocumentLoader::urlForHistory() const
+{
+    // Return the URL to be used for history and B/F list.
+    // Returns nil for WebDataProtocol URLs that aren't alternates 
+    // for unreachable URLs, because these can't be stored in history.
+    if (m_substituteData.isValid())
+        return unreachableURL();
+
+    return m_originalRequestCopy.url();
+}
+
+bool DocumentLoader::urlForHistoryReflectsFailure() const
+{
+    return m_substituteData.isValid() || m_response.httpStatusCode() >= 400;
+}
+
+const KURL& DocumentLoader::originalURL() const
+{
+    return m_originalRequestCopy.url();
+}
+
+const KURL& DocumentLoader::requestURL() const
+{
+    return request().url();
+}
+
+const KURL& DocumentLoader::responseURL() const
+{
+    return m_response.url();
+}
+
+const String& DocumentLoader::responseMIMEType() const
+{
+    return m_response.mimeType();
+}
+
+const KURL& DocumentLoader::unreachableURL() const
+{
+    return m_substituteData.failingURL();
+}
+
+void DocumentLoader::setDefersLoading(bool defers)
+{
+    if (m_mainResourceLoader)
+        m_mainResourceLoader->setDefersLoading(defers);
+    setAllDefersLoading(m_subresourceLoaders, defers);
+    setAllDefersLoading(m_plugInStreamLoaders, defers);
+    if (!defers)
+        deliverSubstituteResourcesAfterDelay();
+}
+
+void DocumentLoader::stopLoadingPlugIns()
+{
+    cancelAll(m_plugInStreamLoaders);
+}
+
+void DocumentLoader::stopLoadingSubresources()
+{
+    cancelAll(m_subresourceLoaders);
+}
+
+void DocumentLoader::addSubresourceLoader(ResourceLoader* loader)
+{
+    m_subresourceLoaders.add(loader);
+    setLoading(true);
+}
+
+void DocumentLoader::removeSubresourceLoader(ResourceLoader* loader)
+{
+    m_subresourceLoaders.remove(loader);
+    updateLoading();
+    if (Frame* frame = m_frame)
+        frame->loader()->checkLoadComplete();
+}
+
+void DocumentLoader::addPlugInStreamLoader(ResourceLoader* loader)
+{
+    m_plugInStreamLoaders.add(loader);
+    setLoading(true);
+}
+
+void DocumentLoader::removePlugInStreamLoader(ResourceLoader* loader)
+{
+    m_plugInStreamLoaders.remove(loader);
+    updateLoading();
+}
+
+bool DocumentLoader::isLoadingMainResource() const
+{
+    return !!m_mainResourceLoader;
+}
+
+bool DocumentLoader::isLoadingSubresources() const
+{
+    return !m_subresourceLoaders.isEmpty();
+}
+
+bool DocumentLoader::isLoadingPlugIns() const
+{
+    return !m_plugInStreamLoaders.isEmpty();
+}
+
+bool DocumentLoader::isLoadingMultipartContent() const
+{
+    return m_mainResourceLoader && m_mainResourceLoader->isLoadingMultipartContent();
+}
+
+bool DocumentLoader::startLoadingMainResource(unsigned long identifier)
+{
+    ASSERT(!m_mainResourceLoader);
+    m_mainResourceLoader = MainResourceLoader::create(m_frame);
+    m_mainResourceLoader->setIdentifier(identifier);
+
+    // FIXME: Is there any way the extra fields could have not been added by now?
+    // If not, it would be great to remove this line of code.
+    frameLoader()->addExtraFieldsToMainResourceRequest(m_request);
+
+    if (!m_mainResourceLoader->load(m_request, m_substituteData)) {
+        // FIXME: If this should really be caught, we should just ASSERT this doesn't happen;
+        // should it be caught by other parts of WebKit or other parts of the app?
+        LOG_ERROR("could not create WebResourceHandle for URL %s -- should be caught by policy handler level", m_request.url().string().ascii().data());
+        m_mainResourceLoader = 0;
+        return false;
+    }
+
+    return true;
+}
+
+void DocumentLoader::cancelMainResourceLoad(const ResourceError& error)
+{
+    m_mainResourceLoader->cancel(error);
+}
+
+void DocumentLoader::subresourceLoaderFinishedLoadingOnePart(ResourceLoader* loader)
+{
+    m_multipartSubresourceLoaders.add(loader);
+    m_subresourceLoaders.remove(loader);
+    updateLoading();
+    if (Frame* frame = m_frame)
+        frame->loader()->checkLoadComplete();    
+}
+
+void DocumentLoader::transferLoadingResourcesFromPage(Page* oldPage)
+{
+    ASSERT(oldPage != m_frame->page());
+
+    FrameLoader* loader = frameLoader();
+    ASSERT(loader);
+
+    const ResourceRequest& request = originalRequest();
+    if (isLoadingMainResource()) {
+        loader->dispatchTransferLoadingResourceFromPage(
+            m_mainResourceLoader->identifier(), this, request, oldPage);
+    }
+
+    if (isLoadingSubresources()) {
+        ResourceLoaderSet::const_iterator it = m_subresourceLoaders.begin();
+        ResourceLoaderSet::const_iterator end = m_subresourceLoaders.end();
+        for (; it != end; ++it) {
+            loader->dispatchTransferLoadingResourceFromPage(
+                (*it)->identifier(), this, request, oldPage);
+        }
+    }
+}
+
+void DocumentLoader::iconLoadDecisionAvailable()
+{
+    if (m_frame)
+        m_frame->loader()->iconLoadDecisionAvailable();
+}
+
+}