webkit加载adobe flash player 10.1[转自邓大侠]

这个不是文档，这个是个人臆测。

Webkit插件加载路径代码在external/webkit/webcore/plugins/PluginDatabase.cpp中。

代码为：

Vector<String> PluginDatabase::defaultPluginDirectories()
{
    Vector<String> paths;

    // Add paths specific to each platform
#if defined(XP_UNIX)
    String userPluginPath = homeDirectoryPath();
    userPluginPath.append(String("/.mozilla/plugins"));
    paths.append(userPluginPath);

    userPluginPath = homeDirectoryPath();
    userPluginPath.append(String("/.netscape/plugins"));
    paths.append(userPluginPath);

    paths.append("/usr/lib/browser/plugins");
    paths.append("/usr/local/lib/mozilla/plugins");
    paths.append("/usr/lib/firefox/plugins");
    paths.append("/usr/lib64/browser-plugins");
    paths.append("/usr/lib/browser-plugins");
    paths.append("/usr/lib/mozilla/plugins");
    paths.append("/usr/local/netscape/plugins");
    paths.append("/opt/mozilla/plugins");
    paths.append("/opt/mozilla/lib/plugins");
    paths.append("/opt/netscape/plugins");
    paths.append("/opt/netscape/communicator/plugins");
    paths.append("/usr/lib/netscape/plugins");
    paths.append("/usr/lib/netscape/plugins-libc5");
    paths.append("/usr/lib/netscape/plugins-libc6");
    paths.append("/usr/lib64/netscape/plugins");
    paths.append("/usr/lib64/mozilla/plugins");
    paths.append("/usr/lib/nsbrowser/plugins");
    paths.append("/usr/lib64/nsbrowser/plugins");

    String mozHome(getenv("MOZILLA_HOME"));
    mozHome.append("/plugins");
    paths.append(mozHome);

    Vector<String> mozPaths;
    String mozPath(getenv("MOZ_PLUGIN_PATH"));
    mozPath.split(UChar(':'), /* allowEmptyEntries */ false, mozPaths);
    paths.append(mozPaths);
#elif defined(XP_MACOSX)
    String userPluginPath = homeDirectoryPath();
    userPluginPath.append(String("/Library/Internet Plug-Ins"));
    paths.append(userPluginPath);
    paths.append("/Library/Internet Plug-Ins");
#elif defined(XP_WIN)
    String userPluginPath = homeDirectoryPath();
    userPluginPath.append(String("//Application Data//Mozilla//plugins"));
    paths.append(userPluginPath);
#endif

    // Add paths specific to each port
#if PLATFORM(QT)
    Vector<String> qtPaths;
    String qtPath(qgetenv("QTWEBKIT_PLUGIN_PATH").constData());
    qtPath.split(UChar(':'), /* allowEmptyEntries */ false, qtPaths);
    paths.append(qtPaths);
#endif

#if PLATFORM(ANDROID)
    if (android::JavaSharedClient::GetPluginClient())
        return android::JavaSharedClient::GetPluginClient()->getPluginDirectories();
#endif

    return paths;
}

红色代码返回到Java共享段，路径为frameworks/base/core/java/android/webkit/PluginManager.java

这儿代码还没仔细看，后续介绍。

    String[] getPluginDirectories() {

        ArrayList<String> directories = new ArrayList<String>();
        PackageManager pm = mContext.getPackageManager();
        List<ResolveInfo> plugins = pm.queryIntentServices(new Intent(
                PLUGIN_ACTION), PackageManager.GET_SERVICES
                | PackageManager.GET_META_DATA);

        synchronized(mPackageInfoCache) {

            // clear the list of existing packageInfo objects
            mPackageInfoCache.clear();

            for (ResolveInfo info : plugins) {

                // retrieve the plugin's service information
                ServiceInfo serviceInfo = info.serviceInfo;
                if (serviceInfo == null) {
                    Log.w(LOGTAG, "Ignore bad plugin");
                    continue;
                }

                // retrieve information from the plugin's manifest
                PackageInfo pkgInfo;
                try {
                    pkgInfo = pm.getPackageInfo(serviceInfo.packageName,
                                    PackageManager.GET_PERMISSIONS
                                    | PackageManager.GET_SIGNATURES);
                } catch (NameNotFoundException e) {
                    Log.w(LOGTAG, "Can't find plugin: " + serviceInfo.packageName);
                    continue;
                }
                if (pkgInfo == null) {
                    continue;
                }

                // check if their is a conflict in the lib directory names
                String directory = pkgInfo.applicationInfo.dataDir + "/lib";
                if (directories.contains(directory)) {
                    continue;
                }

                // check if the plugin has the required permissions
                String permissions[] = pkgInfo.requestedPermissions;
                if (permissions == null) {
                    continue;
                }
                boolean permissionOk = false;
                for (String permit : permissions) {
                    if (PLUGIN_PERMISSION.equals(permit)) {
                        permissionOk = true;
                        break;
                    }
                }
                if (!permissionOk) {
                    continue;
                }

                // check to ensure the plugin is properly signed
                Signature signatures[] = pkgInfo.signatures;
                if (signatures == null) {
                    continue;
                }
                if (SystemProperties.getBoolean("ro.secure", false)) {
                    boolean signatureMatch = false;
                    for (Signature signature : signatures) {
                        for (int i = 0; i < SIGNATURES.length; i++) {
                            if (SIGNATURES[i].equals(signature)) {
                                signatureMatch = true;
                                break;
                            }
a4d4

                        }
                    }
                    if (!signatureMatch) {
                        continue;
                    }
                }

                // determine the type of plugin from the manifest
                if (serviceInfo.metaData == null) {
                    Log.e(LOGTAG, "The plugin '" + serviceInfo.name + "' has no type defined");
                    continue;
                }

                String pluginType = serviceInfo.metaData.getString(PLUGIN_TYPE);
                if (!TYPE_NATIVE.equals(pluginType)) {
                    Log.e(LOGTAG, "Unrecognized plugin type: " + pluginType);
                    continue;
                }

                try {
                    Class<?> cls = getPluginClass(serviceInfo.packageName, serviceInfo.name);

                    //TODO implement any requirements of the plugin class here!
                    boolean classFound = true;

                    if (!classFound) {
                        Log.e(LOGTAG, "The plugin's class' " + serviceInfo.name + "' does not extend the appropriate class.");
                        continue;
                    }

                } catch (NameNotFoundException e) {
                    Log.e(LOGTAG, "Can't find plugin: " + serviceInfo.packageName);
                    continue;
                } catch (ClassNotFoundException e) {
                    Log.e(LOGTAG, "Can't find plugin's class: " + serviceInfo.name);
                    continue;
                }

                // if all checks have passed then make the plugin available
                mPackageInfoCache.add(pkgInfo);
                directories.add(directory);
            }
        }

        return directories.toArray(new String[directories.size()]);
    }

狗日的插件打开地址：external/webkit/WebCore/plugins/android/PluginPackageAndroid.cpp

webkit找插件的过程

1. PluginDatabase::defaultPluginDirectories()
2. GetPluginClient()->getPluginDirectories()
3. 因为JavaBridge继承自PluginClient，所以WTF::Vector<WebCore::String>JavaBridge::getPluginDirectories()
4. 找到mGetPluginDirectories这个方法，调用java的方法getPluginDirectories
5. private String[] JWebCoreJavaBridge::getPluginDirectories()
6. String[] PluginManager::getPluginDirectories()
7. 经过一系列的包的权限等的分析，把通过筛选的路径返回。

此上只是找到合适的路径，那么打开过程呢。
1. addExtraPluginDirectory或者installedPlugins
2. bool PluginDatabase::refresh()
3. PluginPackage::createPackage
4. PluginPackage::fetchInfo()
5. // Open the library
   void *handle = dlopen(m_path.utf8().data(), RTLD_NOW);

如何在java里添加extra_plugin的路径
webkit_web_settings_add_extra_plugin_directory

loadJavaClass
anp_loadJavaClass
------------------------------------------------------------------------
private Class<?> getPluginClass(String libName, String clsName)
String getPluginsAPKName(String pluginLib)
pluginManager.getPluginClass(pkgName, clsName);

可见浏览器插件是跟apk绑定到一起的。

 

 

关于这点我们通宵的结论是

2.2到2.3有一个转变，icu4c的版本由4.2提升到了4.4,所有api的后缀从_4_2变成了_44

恰好狗日的adobe要动态链接这个库库里面的函数，于是在加载adobe的动态库的时候，就会出错

到这里我已经困得不行了，邓大侠精神抖擞，加了个宏编译了一个_4_2的库和一个_44的库

加载是过了，问题又来了，我们公司的芯片是armv5的，adobe库是用armv7工具链编译的，大家都懂的

至此可以说flash10.1的调研算告一段落

 

另外关于flash10.3的调研有一些其他的收获