WebCore/plugins/PluginPackage.cpp

/*
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Collabora, Ltd.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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 "PluginPackage.h"

#include "MIMETypeRegistry.h"
#include "PluginDebug.h"
#include "Timer.h"
#include "npruntime_impl.h"
#include <wtf/OwnArrayPtr.h>

namespace WebCore {

PluginPackage::~PluginPackage()
{
    ASSERT(!m_isLoaded);
}

void PluginPackage::freeLibrarySoon()
{
    ASSERT(!m_freeLibraryTimer.isActive());
    ASSERT(m_module);
    ASSERT(m_loadCount == 0);

    m_freeLibraryTimer.startOneShot(0);
}

void PluginPackage::freeLibraryTimerFired(Timer<PluginPackage>*)
{
    ASSERT(m_module);
    ASSERT(m_loadCount == 0);

    unloadModule(m_module);
    m_module = 0;
}

PluginPackage::PluginPackage(const String& path, const PlatformFileTime& lastModified)
    : RefCounted<PluginPackage>(0)
    , m_path(path)
    , m_moduleVersion(0)
    , m_module(0)
    , m_lastModified(lastModified)
    , m_isLoaded(false)
    , m_loadCount(0)
    , m_freeLibraryTimer(this, &PluginPackage::freeLibraryTimerFired)
{
    m_fileName = pathGetFileName(m_path);
    m_parentDirectory = m_path.left(m_path.length() - m_fileName.length() - 1);
}

void PluginPackage::unload()
{
    if (!m_isLoaded)
        return;

    if (--m_loadCount > 0)
        return;

    m_NPP_Shutdown();

    unloadWithoutShutdown();
}

void PluginPackage::unloadWithoutShutdown()
{
    if (!m_isLoaded)
        return;

    ASSERT(m_loadCount == 0);
    ASSERT(m_module);

    // <rdar://5530519>: Crash when closing tab with pdf file (Reader 7 only)
    // If the plugin has subclassed its parent window, as with Reader 7, we may have
    // gotten here by way of the plugin's internal window proc forwarding a message to our
    // original window proc. If we free the plugin library from here, we will jump back
    // to code we just freed when we return, so delay calling FreeLibrary at least until
    // the next message loop
    freeLibrarySoon();

    m_isLoaded = false;
}

PluginPackage* PluginPackage::createPackage(const String& path, const PlatformFileTime& lastModified)
{
    PluginPackage* package = new PluginPackage(path, lastModified);

    if (!package->fetchInfo()) {
        delete package;
        return 0;
    }
    
    return package;
}

}