com.googlecode.dex2jar.tools.ClassVersionSwitch Maven / Gradle / Ivy
package com.googlecode.dex2jar.tools;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ClassVersionSwitch {
static final int jVersions[] = new int[]{
0,
Opcodes.V1_1,
Opcodes.V1_2,
Opcodes.V1_3,
Opcodes.V1_4,
Opcodes.V1_5,
Opcodes.V1_6,
Opcodes.V1_7,
52,
53,
};
public static void main(String... args) throws IOException {
if (args.length < 3) {
System.out.println("Usage: clz-version-switch version old.jar new.jar");
System.exit(1);
}
int version = Integer.parseInt(args[0]);
if (version < 1 || version > 9) {
throw new RuntimeException("version not support yet!");
}
File old = new File(args[1]);
File n = new File(args[2]);
byte[] buff = new byte[1024 * 50];
final int jVersion = jVersions[version];
try (ZipFile zip = new ZipFile(old); ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(n));) {
for (Enumeration e = zip.entries(); e.hasMoreElements(); ) {
ZipEntry zipEntry = e.nextElement();
zos.putNextEntry(new ZipEntry(zipEntry.getName()));
if (!zipEntry.isDirectory()) {
try (InputStream is = zip.getInputStream(zipEntry)) {
if (zipEntry.getName().endsWith(".class")) {
ClassReader cr = new ClassReader(is);
ClassWriter cw = new ClassWriter(0);
ClassVisitor cv = new ClassVisitor(Opcodes.ASM4, cw) {
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
super.visit(jVersion, access, name, signature, superName, interfaces);
}
};
cr.accept(cv, ClassReader.EXPAND_FRAMES|ClassReader.SKIP_FRAMES);
zos.write(cw.toByteArray());
} else {
for (int c = is.read(buff); c > 0; c = is.read(buff)) {
zos.write(buff, 0, c);
}
}
}
}
zos.closeEntry();
}
}
}
}