/**
 *  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 brut.androlib.mod.SmaliMod;
import java.io.*;
import org.antlr.runtime.RecognitionException;
import org.jf.dexlib.CodeItem;
import org.jf.dexlib.DexFile;
import org.jf.dexlib.Util.ByteArrayAnnotatedOutput;

/**
 * @author Ryszard Wiśniewski <brut.alll@gmail.com>
 */
public class DexFileBuilder {
    public void addSmaliFile(File smaliFile) throws AndrolibException {
        try {
            addSmaliFile(new FileInputStream(smaliFile),
                smaliFile.getAbsolutePath());
        } catch (FileNotFoundException ex) {
            throw new AndrolibException(ex);
        }
    }

    public void addSmaliFile(InputStream smaliStream, String name)throws AndrolibException {
        try {
            if (! SmaliMod.assembleSmaliFile(smaliStream, name, mDexFile, false, false, false)) {
                throw new AndrolibException("Could not smali file: " + name);
            }
        } catch (IOException ex) {
            throw new AndrolibException(ex);
        } catch (RecognitionException ex) {
            throw new AndrolibException(ex);
        }
    }

    public void writeTo(File dexFile) throws AndrolibException {
        try {
            OutputStream out = new FileOutputStream(dexFile);
            out.write(getAsByteArray());
            out.close();
        } catch (IOException ex) {
            throw new AndrolibException(
                "Could not write dex to file: " + dexFile, ex);
        }
    }

    public byte[] getAsByteArray() {
        mDexFile.place();
        for (CodeItem codeItem: mDexFile.CodeItemsSection.getItems()) {
            codeItem.fixInstructions(true, true);
        }

        mDexFile.place();

        ByteArrayAnnotatedOutput out = new ByteArrayAnnotatedOutput();
        mDexFile.writeTo(out);
        byte[] bytes = out.toByteArray();

        DexFile.calcSignature(bytes);
        DexFile.calcChecksum(bytes);

        return bytes;
    }

    private final DexFile mDexFile = new DexFile();
}