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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
/**
* Generates a jar file with the specified number of .class entries.
*
* usage: GenZipWithEntries <number of zip entries> <output file>
*/
public class GenZipWithEntries {
public static void main(String[] args) throws IOException {
int entries = Integer.parseInt(args[0]);
Path out = Paths.get(args[1]);
try (OutputStream os = Files.newOutputStream(out);
JarOutputStream jos = new JarOutputStream(os)) {
for (int i = 1; i <= entries; i++) {
String name = String.format("Test%d", i);
jos.putNextEntry(new ZipEntry(String.format("%s.class", name)));
jos.write(dump(name));
}
}
}
public static byte[] dump(String name) {
ClassWriter cw = new ClassWriter(0);
cw.visit(52, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, name, null, "java/lang/Object", null);
{
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
}