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/*
* Copyright 2016 OpenMarket Ltd
* Copyright 2016 Vector Creations Ltd
*
* 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 org.matrix.olm;
import android.util.Log;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* Helper class dedicated to serialization mechanism (template method pattern).
*/
abstract class CommonSerializeUtils {
private static final String LOG_TAG = "CommonSerializeUtils";
/**
* Kick off the serialization mechanism.
* @param aOutStream output stream for serializing
* @throws IOException exception
*/
protected void serialize(ObjectOutputStream aOutStream) throws IOException {
aOutStream.defaultWriteObject();
// generate serialization key
byte[] key = OlmUtility.getRandomKey();
// compute pickle string
StringBuffer errorMsg = new StringBuffer();
byte[] pickledData = serialize(key, errorMsg);
if(null == pickledData) {
throw new OlmException(OlmException.EXCEPTION_CODE_ACCOUNT_SERIALIZATION, String.valueOf(errorMsg));
} else {
aOutStream.writeObject(new String(key, "UTF-8"));
aOutStream.writeObject(new String(pickledData, "UTF-8"));
}
}
/**
* Kick off the deserialization mechanism.
* @param aInStream input stream
* @throws Exception the exception
*/
protected void deserialize(ObjectInputStream aInStream) throws Exception {
aInStream.defaultReadObject();
String keyAsString = (String)aInStream.readObject();
String pickledDataAsString = (String)aInStream.readObject();
byte[] key;
byte[] pickledData;
try {
key = keyAsString.getBytes("UTF-8");
pickledData = pickledDataAsString.getBytes("UTF-8");
deserialize(pickledData, key);
} catch (Exception e) {
throw new OlmException(OlmException.EXCEPTION_CODE_ACCOUNT_DESERIALIZATION, e.getMessage());
}
Log.d(LOG_TAG,"## deserializeObject(): success");
}
protected abstract byte[] serialize(byte[] aKey, StringBuffer aErrorMsg);
protected abstract void deserialize(byte[] aSerializedData, byte[] aKey) throws Exception;
}
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