/*

 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.

 * Copyright (C) 2008 Collabora Ltd.  All rights reserved.

 * Copyright (C) 2009 Holger Hans Peter Freyther

 *

 * 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 "PluginDatabase.h"

#include "PluginDebug.h"

#include "Timer.h"

#include "npruntime_impl.h"

#include <string.h>

#include <wtf/OwnArrayPtr.h>

#include <wtf/text/CString.h>

namespace WebCore {

PluginPackage::~PluginPackage()

{

    // This destructor gets called during refresh() if PluginDatabase's

    // PluginSet hash is already populated, as it removes items from

    // the hash table. Calling the destructor on a loaded plug-in of

    // course would cause a crash, so we check to call unload before we

    // ASSERT.

    // FIXME: There is probably a better way to fix this.

    if (!m_loadCount)

        unloadWithoutShutdown();

    else

        unload();

    ASSERT(!m_isLoaded);

}

void PluginPackage::freeLibrarySoon()

{

    ASSERT(!m_freeLibraryTimer.isActive());

    ASSERT(m_module);

    ASSERT(!m_loadCount);

    m_freeLibraryTimer.startOneShot(0);

}

void PluginPackage::freeLibraryTimerFired(Timer<PluginPackage>*)

{

    ASSERT(m_module);

    ASSERT(!m_loadCount);

    unloadModule(m_module);

    m_module = 0;

}

int PluginPackage::compare(const PluginPackage& compareTo) const

{

    // Sort plug-ins that allow multiple instances first.

    bool AallowsMultipleInstances = !quirks().contains(PluginQuirkDontAllowMultipleInstances);

    bool BallowsMultipleInstances = !compareTo.quirks().contains(PluginQuirkDontAllowMultipleInstances);

    if (AallowsMultipleInstances != BallowsMultipleInstances)

        return AallowsMultipleInstances ? -1 : 1;

    // Sort plug-ins in a preferred path first.

    bool AisInPreferredDirectory = PluginDatabase::isPreferredPluginDirectory(parentDirectory());

    bool BisInPreferredDirectory = PluginDatabase::isPreferredPluginDirectory(compareTo.parentDirectory());

    if (AisInPreferredDirectory != BisInPreferredDirectory)

        return AisInPreferredDirectory ? -1 : 1;

    int diff = strcmp(name().utf8().data(), compareTo.name().utf8().data());

    if (diff)

        return diff;

    diff = compareFileVersion(compareTo.version());

    if (diff)

        return diff;

    return strcmp(parentDirectory().utf8().data(), compareTo.parentDirectory().utf8().data());

}

PluginPackage::PluginPackage(const String& path, const time_t& lastModified)

    : m_isEnabled(true)

    , m_isLoaded(false)

    , m_loadCount(0)

    , m_path(path)

    , m_moduleVersion(0)

    , m_module(0)

    , m_lastModified(lastModified)

    , m_freeLibraryTimer(this, &PluginPackage::freeLibraryTimerFired)

{

    m_fileName = pathGetFileName(m_path);

    m_parentDirectory = m_path.left(m_path.length() - m_fileName.length() - 1);

}

#if !OS(SYMBIAN)

void PluginPackage::unload()

{

    if (!m_isLoaded)

        return;

    if (--m_loadCount > 0)

        return;

    m_NPP_Shutdown();

    unloadWithoutShutdown();

}

#endif // !OS(SYMBIAN)

void PluginPackage::unloadWithoutShutdown()

{

    if (!m_isLoaded)

        return;

    ASSERT(!m_loadCount);

    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;

}

void PluginPackage::setEnabled(bool enabled)

{

    m_isEnabled = enabled;

}

PassRefPtr<PluginPackage> PluginPackage::createPackage(const String& path, const time_t& lastModified)

{

    RefPtr<PluginPackage> package = adoptRef(new PluginPackage(path, lastModified));

    if (!package->fetchInfo())

        return 0;

    return package.release();

}

#if defined(XP_UNIX)

void PluginPackage::determineQuirks(const String& mimeType)

{

    if (MIMETypeRegistry::isJavaAppletMIMEType(mimeType)) {

        // Because a single process cannot create multiple VMs, and we cannot reliably unload a

        // Java VM, we cannot unload the Java plugin, or we'll lose reference to our only VM

        m_quirks.add(PluginQuirkDontUnloadPlugin);

        // Setting the window region to an empty region causes bad scrolling repaint problems

        // with the Java plug-in.

        m_quirks.add(PluginQuirkDontClipToZeroRectWhenScrolling);

        return;

    }

    if (mimeType == "application/x-shockwave-flash") {

        static const PlatformModuleVersion flashTenVersion(0x0a000000);

        if (compareFileVersion(flashTenVersion) >= 0) {

            // Flash 10.0 b218 doesn't like having a NULL window handle

            m_quirks.add(PluginQuirkDontSetNullWindowHandleOnDestroy);

#if PLATFORM(QT)

            m_quirks.add(PluginQuirkRequiresGtkToolKit);

#endif

        } else {

            // Flash 9 and older requests windowless plugins if we return a mozilla user agent

            m_quirks.add(PluginQuirkWantsMozillaUserAgent);

#if PLATFORM(QT)

            // Flash 9 and older would crash on repeated calls to SetWindow in windowed mode

            m_quirks.add(PluginQuirkDontCallSetWindowMoreThanOnce);

#endif

        }

        m_quirks.add(PluginQuirkThrottleInvalidate);

        m_quirks.add(PluginQuirkThrottleWMUserPlusOneMessages);

        m_quirks.add(PluginQuirkFlashURLNotifyBug);

    }

}

#endif

#if !OS(WINDOWS)

void PluginPackage::determineModuleVersionFromDescription()

{

    // It's a bit lame to detect the plugin version by parsing it

    // from the plugin description string, but it doesn't seem that

    // version information is available in any standardized way at

    // the module level, like in Windows

    if (m_description.isEmpty())

        return;

    if (m_description.startsWith("Shockwave Flash") && m_description.length() >= 19) {

        // The flash version as a PlatformModuleVersion differs on Unix from Windows

        // since the revision can be larger than a 8 bits, so we allow it 16 here and

        // push the major/minor up 8 bits. Thus on Unix, Flash's version may be

        // 0x0a000000 instead of 0x000a0000.

        Vector<String> versionParts;

        m_description.substring(16).split(' ', /*allowEmptyEntries =*/ false, versionParts);

        if (versionParts.isEmpty())

            return;

        if (versionParts.size() >= 1) {

            Vector<String> majorMinorParts;

            versionParts[0].split('.', majorMinorParts);

            if (majorMinorParts.size() >= 1) {

                bool converted = false;

                unsigned major = majorMinorParts[0].toUInt(&converted);

                if (converted)

                    m_moduleVersion = (major & 0xff) << 24;

            }

            if (majorMinorParts.size() == 2) {

                bool converted = false;

                unsigned minor = majorMinorParts[1].toUInt(&converted);

                if (converted)

                    m_moduleVersion |= (minor & 0xff) << 16;

            }

        }

        if (versionParts.size() >= 2) {

            String revision = versionParts[1];

            if (revision.length() > 1 && (revision[0] == 'r' || revision[0] == 'b')) {

                revision.remove(0, 1);

                m_moduleVersion |= revision.toInt() & 0xffff;

            }

        }

    }

}

#endif

#if ENABLE(NETSCAPE_PLUGIN_API)

void PluginPackage::initializeBrowserFuncs()

{

    memset(&m_browserFuncs, 0, sizeof(m_browserFuncs));

    m_browserFuncs.size = sizeof(m_browserFuncs);

    m_browserFuncs.version = NPVersion();

    m_browserFuncs.geturl = NPN_GetURL;

    m_browserFuncs.posturl = NPN_PostURL;

    m_browserFuncs.requestread = NPN_RequestRead;

    m_browserFuncs.newstream = NPN_NewStream;

    m_browserFuncs.write = NPN_Write;

    m_browserFuncs.destroystream = NPN_DestroyStream;

    m_browserFuncs.status = NPN_Status;

    m_browserFuncs.uagent = NPN_UserAgent;

    m_browserFuncs.memalloc = NPN_MemAlloc;

    m_browserFuncs.memfree = NPN_MemFree;

    m_browserFuncs.memflush = NPN_MemFlush;

    m_browserFuncs.reloadplugins = NPN_ReloadPlugins;

    m_browserFuncs.geturlnotify = NPN_GetURLNotify;

    m_browserFuncs.posturlnotify = NPN_PostURLNotify;

    m_browserFuncs.getvalue = NPN_GetValue;

    m_browserFuncs.setvalue = NPN_SetValue;

    m_browserFuncs.invalidaterect = NPN_InvalidateRect;

    m_browserFuncs.invalidateregion = NPN_InvalidateRegion;

    m_browserFuncs.forceredraw = NPN_ForceRedraw;

    m_browserFuncs.getJavaEnv = NPN_GetJavaEnv;

    m_browserFuncs.getJavaPeer = NPN_GetJavaPeer;

    m_browserFuncs.pushpopupsenabledstate = NPN_PushPopupsEnabledState;

    m_browserFuncs.poppopupsenabledstate = NPN_PopPopupsEnabledState;

    m_browserFuncs.pluginthreadasynccall = NPN_PluginThreadAsyncCall;

    m_browserFuncs.releasevariantvalue = _NPN_ReleaseVariantValue;

    m_browserFuncs.getstringidentifier = _NPN_GetStringIdentifier;

    m_browserFuncs.getstringidentifiers = _NPN_GetStringIdentifiers;

    m_browserFuncs.getintidentifier = _NPN_GetIntIdentifier;

    m_browserFuncs.identifierisstring = _NPN_IdentifierIsString;

    m_browserFuncs.utf8fromidentifier = _NPN_UTF8FromIdentifier;

    m_browserFuncs.intfromidentifier = _NPN_IntFromIdentifier;

    m_browserFuncs.createobject = _NPN_CreateObject;

    m_browserFuncs.retainobject = _NPN_RetainObject;

    m_browserFuncs.releaseobject = _NPN_ReleaseObject;

    m_browserFuncs.invoke = _NPN_Invoke;

    m_browserFuncs.invokeDefault = _NPN_InvokeDefault;

    m_browserFuncs.evaluate = _NPN_Evaluate;

    m_browserFuncs.getproperty = _NPN_GetProperty;

    m_browserFuncs.setproperty = _NPN_SetProperty;

    m_browserFuncs.removeproperty = _NPN_RemoveProperty;

    m_browserFuncs.hasproperty = _NPN_HasProperty;

    m_browserFuncs.hasmethod = _NPN_HasMethod;

    m_browserFuncs.setexception = _NPN_SetException;

    m_browserFuncs.enumerate = _NPN_Enumerate;

    m_browserFuncs.construct = _NPN_Construct;

}

#endif

#if ENABLE(PLUGIN_PACKAGE_SIMPLE_HASH)

unsigned PluginPackage::hash() const

{

    unsigned hashCodes[] = {

        m_path.impl()->hash(),

        m_lastModified

    };

    return StringImpl::computeHash(reinterpret_cast<UChar*>(hashCodes), sizeof(hashCodes) / sizeof(UChar));

}

bool PluginPackage::equal(const PluginPackage& a, const PluginPackage& b)

{

    return a.m_description == b.m_description;

}

#endif

int PluginPackage::compareFileVersion(const PlatformModuleVersion& compareVersion) const

{

    // return -1, 0, or 1 if plug-in version is less than, equal to, or greater than

    // the passed version

#if OS(WINDOWS)

    if (m_moduleVersion.mostSig != compareVersion.mostSig)

        return m_moduleVersion.mostSig > compareVersion.mostSig ? 1 : -1;

    if (m_moduleVersion.leastSig != compareVersion.leastSig)

        return m_moduleVersion.leastSig > compareVersion.leastSig ? 1 : -1;

#else    

    if (m_moduleVersion != compareVersion)

        return m_moduleVersion > compareVersion ? 1 : -1;

#endif

    return 0;

}

}