mirror of
https://github.com/moparisthebest/open-keychain
synced 2024-08-13 15:53:53 -04:00
216 lines
6.6 KiB
Java
216 lines
6.6 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.util;
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import android.content.Context;
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import android.os.Parcel;
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import android.os.Parcelable;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.KeychainApplication;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.EOFException;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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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.Iterator;
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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 ParcelableFileCache<E extends Parcelable> {
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private Context mContext;
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private final String mFilename;
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public ParcelableFileCache(Context context, String filename) {
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mContext = context;
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mFilename = filename;
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}
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public void writeCache(IteratorWithSize<E> it) throws IOException {
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writeCache(it.getSize(), it);
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}
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public void writeCache(int numEntries, Iterator<E> it) throws IOException {
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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(), mFilename);
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DataOutputStream oos = new DataOutputStream(new FileOutputStream(tempFile));
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oos.writeInt(numEntries);
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while (it.hasNext()) {
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Parcel p = Parcel.obtain(); // creating empty parcel object
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p.writeParcelable(it.next(), 0); // saving bundle as parcel
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byte[] buf = p.marshall();
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oos.writeInt(buf.length);
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oos.write(buf);
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p.recycle();
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}
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oos.close();
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}
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public IteratorWithSize<E> readCache() throws IOException {
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return readCache(true);
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}
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public IteratorWithSize<E> readCache(final boolean deleteAfterRead) throws IOException {
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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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final File tempFile = new File(cacheDir, mFilename);
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final DataInputStream ois;
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try {
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ois = new DataInputStream(new FileInputStream(tempFile));
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} catch (FileNotFoundException e) {
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Log.e(Constants.TAG, "parcel import file not existing", e);
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throw new IOException(e);
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}
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// yes this is sloppy data flow. WE WOULDN'T NEED THIS WITH TUPLE RETURN TYPES
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final int numEntries = ois.readInt();
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return new IteratorWithSize<E>() {
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E mRing = null;
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boolean closed = false;
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byte[] buf = new byte[512];
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public int getSize() {
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return numEntries;
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}
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private void readNext() {
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if (mRing != null || closed) {
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return;
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}
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try {
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int length = ois.readInt();
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while (buf.length < length) {
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buf = new byte[buf.length * 2];
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}
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ois.readFully(buf, 0, length);
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Parcel parcel = Parcel.obtain(); // creating empty parcel object
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parcel.unmarshall(buf, 0, length);
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parcel.setDataPosition(0);
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mRing = parcel.readParcelable(KeychainApplication.class.getClassLoader());
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parcel.recycle();
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} catch (EOFException e) {
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// aight
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close();
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} catch (IOException e) {
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Log.e(Constants.TAG, "Encountered IOException during cache read!", e);
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}
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}
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@Override
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public boolean hasNext() {
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readNext();
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return mRing != null;
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}
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@Override
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public E next() {
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readNext();
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try {
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return mRing;
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} finally {
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mRing = null;
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}
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}
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@Override
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public void remove() {
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throw new UnsupportedOperationException();
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}
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@Override
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public void finalize() throws Throwable {
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close();
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super.finalize();
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}
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private void close() {
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if (!closed) {
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try {
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ois.close();
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if (deleteAfterRead) {
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//noinspection ResultOfMethodCallIgnored
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tempFile.delete();
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}
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} catch (IOException e) {
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// nvm
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}
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}
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closed = true;
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}
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};
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}
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public boolean delete() throws IOException {
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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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final File tempFile = new File(cacheDir, mFilename);
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return tempFile.delete();
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}
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/** As the name implies, this is an extended iterator interface, which
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* knows the total number of its entries beforehand.
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*/
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public static interface IteratorWithSize<E> extends Iterator<E> {
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/** Returns the number of total entries in this iterator. */
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int getSize();
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}
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}
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