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/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.keyimport;
import android.content.Context;
import android.os.Bundle;
import android.os.Parcel;
import org.sufficientlysecure.keychain.KeychainApplication;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* When sending large data (over 1MB) through Androids Binder IPC you get
* JavaBinder E !!! FAILED BINDER TRANSACTION !!!
* <p/>
* To overcome this problem, we cache large Parcelables into a file in our private cache directory
* instead of sending them through IPC.
*/
public class FileImportCache {
private Context mContext;
private static final String FILENAME = "key_import.pcl";
private static final String BUNDLE_DATA = "data";
public FileImportCache(Context context) {
this.mContext = context;
}
public void writeCache(ArrayList<ParcelableKeyRing> selectedEntries) throws IOException {
Bundle in = new Bundle();
in.putParcelableArrayList(BUNDLE_DATA, selectedEntries);
File cacheDir = mContext.getCacheDir();
if (cacheDir == null) {
// https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU
throw new IOException("cache dir is null!");
}
File tempFile = new File(mContext.getCacheDir(), FILENAME);
FileOutputStream fos = new FileOutputStream(tempFile);
Parcel p = Parcel.obtain(); // creating empty parcel object
in.writeToParcel(p, 0); // saving bundle as parcel
fos.write(p.marshall()); // writing parcel to file
fos.flush();
fos.close();
}
public List<ParcelableKeyRing> readCache() throws IOException {
Parcel parcel = Parcel.obtain(); // creating empty parcel object
Bundle out;
File cacheDir = mContext.getCacheDir();
if (cacheDir == null) {
// https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU
throw new IOException("cache dir is null!");
}
File tempFile = new File(cacheDir, FILENAME);
try {
FileInputStream fis = new FileInputStream(tempFile);
byte[] array = new byte[(int) fis.getChannel().size()];
fis.read(array, 0, array.length);
fis.close();
parcel.unmarshall(array, 0, array.length);
parcel.setDataPosition(0);
out = parcel.readBundle(KeychainApplication.class.getClassLoader());
out.putAll(out);
return out.getParcelableArrayList(BUNDLE_DATA);
} finally {
parcel.recycle();
// delete temp file
tempFile.delete();
}
}
}
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