/*

 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.IOException;

import java.io.InputStream;

import java.util.Enumeration;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import com.sun.tools.classfile.AccessFlags;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.ConstantPoolException;

import com.sun.tools.classfile.Method;

import java.util.Comparator;

import java.util.Set;

import java.util.TreeSet;

public class FindNativeFiles {

    public static void main(String[] args) throws IOException, ConstantPoolException {

        new FindNativeFiles().run(args);

    }

    public void run(String[] args) throws IOException, ConstantPoolException {

        JarFile jar = new JarFile(args[0]);

        Set<JarEntry> entries = getNativeClasses(jar);

        for (JarEntry e: entries) {

            String name = e.getName();

            String className = name.substring(0, name.length() - 6).replace("/", ".");

            System.out.println(className);

        }

    }

    Set<JarEntry> getNativeClasses(JarFile jar) throws IOException, ConstantPoolException {

        Set<JarEntry> results = new TreeSet<JarEntry>(new Comparator<JarEntry>() {

            public int compare(JarEntry o1, JarEntry o2) {

                return o1.getName().compareTo(o2.getName());

            }

        });

        Enumeration<JarEntry> e = jar.entries();

        while (e.hasMoreElements()) {

            JarEntry je = e.nextElement();

            if (isNativeClass(jar, je))

                results.add(je);

        }

        return results;

    }

    boolean isNativeClass(JarFile jar, JarEntry entry) throws IOException, ConstantPoolException {

        String name = entry.getName();

        if (name.startsWith("META-INF") || !name.endsWith(".class"))

            return false;

        //String className = name.substring(0, name.length() - 6).replace("/", ".");

        //System.err.println("check " + className);

        InputStream in = jar.getInputStream(entry);

        ClassFile cf = ClassFile.read(in);

        in.close();

        for (int i = 0; i < cf.methods.length; i++) {

            Method m = cf.methods[i];

            if (m.access_flags.is(AccessFlags.ACC_NATIVE)) {

                // System.err.println(className);

                return true;

            }

        }

        return false;

    }

}