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      1 /*
      2  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #import "WebDocumentLoaderMac.h"
     30 
     31 #import "WebKitVersionChecks.h"
     32 #import "WebView.h"
     33 
     34 using namespace WebCore;
     35 
     36 WebDocumentLoaderMac::WebDocumentLoaderMac(const ResourceRequest& request, const SubstituteData& substituteData)
     37     : DocumentLoader(request, substituteData)
     38     , m_dataSource(nil)
     39     , m_isDataSourceRetained(false)
     40 {
     41 }
     42 
     43 static inline bool needsDataLoadWorkaround(WebView *webView)
     44 {
     45 #ifdef BUILDING_ON_TIGER
     46     // Tiger has to be a little less efficient.
     47     id frameLoadDelegate = [webView frameLoadDelegate];
     48     if (!frameLoadDelegate)
     49         return false;
     50 
     51     NSString *bundleIdentifier = [[NSBundle bundleForClass:[frameLoadDelegate class]] bundleIdentifier];
     52 
     53     if ([bundleIdentifier isEqualToString:@"com.apple.AppKit"])
     54         return true;
     55     if ([bundleIdentifier isEqualToString:@"com.adobe.Installers.Setup"])
     56         return true;
     57     return false;
     58 #else
     59     static bool needsWorkaround = !WebKitLinkedOnOrAfter(WEBKIT_FIRST_VERSION_WITHOUT_ADOBE_INSTALLER_QUIRK)
     60                                   && [[[NSBundle mainBundle] bundleIdentifier] isEqualToString:@"com.adobe.Installers.Setup"];
     61     return needsWorkaround;
     62 #endif
     63 }
     64 
     65 void WebDocumentLoaderMac::setDataSource(WebDataSource *dataSource, WebView *webView)
     66 {
     67     ASSERT(!m_dataSource);
     68     ASSERT(!m_isDataSourceRetained);
     69 
     70     m_dataSource = dataSource;
     71     retainDataSource();
     72 
     73     m_resourceLoadDelegate = [webView resourceLoadDelegate];
     74     m_downloadDelegate = [webView downloadDelegate];
     75 
     76     // Some clients run the run loop in a way that prevents the data load timer
     77     // from firing. We work around that issue here. See <rdar://problem/5266289>
     78     // and <rdar://problem/5049509>.
     79     if (needsDataLoadWorkaround(webView))
     80         m_deferMainResourceDataLoad = false;
     81 }
     82 
     83 WebDataSource *WebDocumentLoaderMac::dataSource() const
     84 {
     85     return m_dataSource;
     86 }
     87 
     88 void WebDocumentLoaderMac::attachToFrame()
     89 {
     90     DocumentLoader::attachToFrame();
     91 
     92     retainDataSource();
     93 }
     94 
     95 void WebDocumentLoaderMac::detachFromFrame()
     96 {
     97     DocumentLoader::detachFromFrame();
     98 
     99     if (m_loadingResources.isEmpty())
    100         releaseDataSource();
    101 
    102     // FIXME: What prevents the data source from getting deallocated while the
    103     // frame is not attached?
    104 }
    105 
    106 void WebDocumentLoaderMac::increaseLoadCount(unsigned long identifier)
    107 {
    108     ASSERT(m_dataSource);
    109 
    110     if (m_loadingResources.contains(identifier))
    111         return;
    112     m_loadingResources.add(identifier);
    113 
    114     retainDataSource();
    115 }
    116 
    117 void WebDocumentLoaderMac::decreaseLoadCount(unsigned long identifier)
    118 {
    119     HashSet<unsigned long>::iterator it = m_loadingResources.find(identifier);
    120 
    121     // It is valid for a load to be cancelled before it's started.
    122     if (it == m_loadingResources.end())
    123         return;
    124 
    125     m_loadingResources.remove(it);
    126 
    127     if (m_loadingResources.isEmpty()) {
    128         m_resourceLoadDelegate = 0;
    129         m_downloadDelegate = 0;
    130         if (!frame())
    131             releaseDataSource();
    132     }
    133 }
    134 
    135 void WebDocumentLoaderMac::retainDataSource()
    136 {
    137     if (m_isDataSourceRetained || !m_dataSource)
    138         return;
    139     m_isDataSourceRetained = true;
    140     CFRetain(m_dataSource);
    141 }
    142 
    143 void WebDocumentLoaderMac::releaseDataSource()
    144 {
    145     if (!m_isDataSourceRetained)
    146         return;
    147     ASSERT(m_dataSource);
    148     m_isDataSourceRetained = false;
    149     CFRelease(m_dataSource);
    150 }
    151 
    152 void WebDocumentLoaderMac::detachDataSource()
    153 {
    154     ASSERT(!m_isDataSourceRetained);
    155     m_dataSource = nil;
    156 }
    157