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