SmaliDecoder.java

/**
 *  Copyright 2011 Ryszard Wiśniewski <brut.alll@gmail.com>
 *
 *  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 brut.androlib.src;

import brut.androlib.AndrolibException;
import org.jf.baksmali.baksmali;
import org.jf.dexlib.Code.Analysis.ClassPath;
import org.jf.dexlib.DexFile;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

/**
 * @author Ryszard Wiśniewski <brut.alll@gmail.com>
 */
public class SmaliDecoder {

	public static void decode(File apkFile, File outDir, boolean debug, String debugLinePrefix,
			boolean bakdeb) throws AndrolibException {
		new SmaliDecoder(apkFile, outDir, debug, debugLinePrefix, bakdeb).decode();
	}

	private SmaliDecoder(File apkFile, File outDir, boolean debug, String debugLinePrefix,
			boolean bakdeb) {
		mApkFile = apkFile;
		mOutDir = outDir.toPath();
		mDebug = debug;
        mDebugLinePrefix = debugLinePrefix;
		mBakDeb = bakdeb;
	}

	private void decode() throws AndrolibException {
		try {
            ClassPath.dontLoadClassPath = mDebug;
			baksmali.disassembleDexFile(mApkFile.getAbsolutePath(),
					new DexFile(mApkFile), false, mOutDir.toAbsolutePath().toString(),
					null, null, null, false, true, true, mBakDeb, false, false,
                    mDebug ? org.jf.baksmali.main.DIFFPRE : 0, false, false, null, false);

            if (mDebug) {
                Files.walkFileTree(mOutDir, new SmaliFileVisitor());
            }
		} catch (IOException ex) {
			throw new AndrolibException(ex);
		}
	}

	private final File mApkFile;
	private final Path mOutDir;
	private final boolean mDebug;
    private final String mDebugLinePrefix;
	private final boolean mBakDeb;


    private class SmaliFileVisitor extends SimpleFileVisitor<Path> {
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            String fileName = file.getFileName().toString();
            if (! fileName.endsWith(".smali")) {
                return FileVisitResult.CONTINUE;
            }
            fileName = fileName.substring(0, fileName.length() - 6);
            try (
                    BufferedReader in = Files.newBufferedReader(file, Charset.defaultCharset());
                    BufferedWriter out = Files.newBufferedWriter(
                            file.resolveSibling(fileName + ".java"), Charset.defaultCharset())
            ) {
                TypeName type = TypeName.fromPath(mOutDir.relativize(file.resolveSibling(fileName)));
                out.write("package " + type.package_ + "; class " + type.getName(true, true) + " { void a() { int a;");
                out.newLine();

                String line;
                final String debugLinePrefix = mDebugLinePrefix;
                while ((line = in.readLine()) != null) {
                    out.write(debugLinePrefix);
                    out.write(line);
                    out.newLine();
                }

                out.write("}}");
                out.newLine();
            }
            Files.delete(file);
            return FileVisitResult.CONTINUE;
        }
    }
}