ASM: a very small and fast Java bytecode manipulation framework
Copyright (c) 2000-2011 INRIA, France Telecom
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.
3. Neither the name of the copyright holders nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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)
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THE POSSIBILITY OF SUCH DAMAGE.
/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * 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.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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.
 */
package org.objectweb.asm.optimizer;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

A Jar file optimizer.
Author:
Eric Bruneton/**
 * A Jar file optimizer.
 * 
 * @author Eric Bruneton
 */
public class JarOptimizer {

    static final Set<String> API = new HashSet<String>();
    static final Map<String, String> HIERARCHY = new HashMap<String, String>();
    static boolean nodebug = false;

    public static void main(final String[] args) throws IOException {
        File f = new File(args[0]);
        InputStream is = new GZIPInputStream(new FileInputStream(f));
        BufferedReader lnr = new LineNumberReader(new InputStreamReader(is));
        while (true) {
            String line = lnr.readLine();
            if (line != null) {
                if (line.startsWith("class")) {
                    String c = line.substring(6, line.lastIndexOf(' '));
                    String sc = line.substring(line.lastIndexOf(' ') + 1);
                    HIERARCHY.put(c, sc);
                } else {
                    API.add(line);
                }
            } else {
                break;
            }
        }

        int argIndex = 1;
        if (args[argIndex].equals("-nodebug")) {
            nodebug = true;
            argIndex++;
        }

        optimize(new File(args[argIndex]));
    }

    static void optimize(final File f) throws IOException {
        if (nodebug && f.getName().contains("debug")) {
            return;
        }

        if (f.isDirectory()) {
            File[] files = f.listFiles();
            for (int i = 0; i < files.length; ++i) {
                optimize(files[i]);
            }
        } else if (f.getName().endsWith(".jar")) {
            File g = new File(f.getParentFile(), f.getName() + ".new");
            ZipFile zf = new ZipFile(f);
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(g));
            Enumeration<? extends ZipEntry> e = zf.entries();
            byte[] buf = new byte[10000];
            while (e.hasMoreElements()) {
                ZipEntry ze = e.nextElement();
                if (ze.isDirectory()) {
                    out.putNextEntry(ze);
                    continue;
                }
                out.putNextEntry(ze);
                if (ze.getName().endsWith(".class")) {
                    ClassReader cr = new ClassReader(zf.getInputStream(ze));
                    // cr.accept(new ClassDump(), 0);
                    cr.accept(new ClassVerifier(), 0);
                }
                InputStream is = zf.getInputStream(ze);
                int n;
                do {
                    n = is.read(buf, 0, buf.length);
                    if (n != -1) {
                        out.write(buf, 0, n);
                    }
                } while (n != -1);
                out.closeEntry();
            }
            out.close();
            zf.close();
            if (!f.delete()) {
                throw new IOException("Cannot delete file " + f);
            }
            if (!g.renameTo(f)) {
                throw new IOException("Cannot rename file " + g);
            }
        }
    }

    static class ClassDump extends ClassVisitor {

        String owner;

        public ClassDump() {
            super(Opcodes.ASM5);
        }

        @Override
        public void visit(final int version, final int access,
                final String name, final String signature,
                final String superName, final String[] interfaces) {
            owner = name;
            if (owner.startsWith("java/")) {
                System.out.println("class " + name + ' ' + superName);
            }
        }

        @Override
        public FieldVisitor visitField(final int access, final String name,
                final String desc, final String signature, final Object value) {
            if (owner.startsWith("java/")) {
                System.out.println(owner + ' ' + name);
            }
            return null;
        }

        @Override
        public MethodVisitor visitMethod(final int access, final String name,
                final String desc, final String signature,
                final String[] exceptions) {
            if (owner.startsWith("java/")) {
                System.out.println(owner + ' ' + name + desc);
            }
            return null;
        }
    }

    static class ClassVerifier extends ClassVisitor {

        String owner;

        String method;

        public ClassVerifier() {
            super(Opcodes.ASM5);
        }

        @Override
        public void visit(final int version, final int access,
                final String name, final String signature,
                final String superName, final String[] interfaces) {
            owner = name;
        }

        @Override
        public MethodVisitor visitMethod(final int access, final String name,
                final String desc, final String signature,
                final String[] exceptions) {
            method = name + desc;
            return new MethodVisitor(Opcodes.ASM5) {
                @Override
                public void visitFieldInsn(final int opcode,
                        final String owner, final String name, final String desc) {
                    check(owner, name);
                }

                @Override
                public void visitMethodInsn(final int opcode,
                        final String owner, final String name,
                        final String desc, final boolean itf) {
                    check(owner, name + desc);
                }
            };
        }

        void check(String owner, String member) {
            if (owner.startsWith("java/")) {
                String o = owner;
                while (o != null) {
                    if (API.contains(o + ' ' + member)) {
                        return;
                    }
                    o = HIERARCHY.get(o);
                }
                System.out.println("WARNING: " + owner + ' ' + member
                        + " called in " + this.owner + ' ' + method
                        + " is not defined in JDK 1.3 API");
            }
        }
    }
}