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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 android.drm;
import static android.drm.DrmConvertedStatus.STATUS_OK;
import static android.drm.DrmManagerClient.INVALID_SESSION;
import android.util.Log;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.net.UnknownServiceException;
import java.util.Arrays;
import libcore.io.Streams;
/**
* Stream that applies a {@link DrmManagerClient} transformation to data before
* writing to disk, similar to a {@link FilterOutputStream}.
*
* @hide
*/
public class DrmOutputStream extends OutputStream {
private static final String TAG = "DrmOutputStream";
private final DrmManagerClient mClient;
private final RandomAccessFile mFile;
private int mSessionId = INVALID_SESSION;
/**
* @param file Opened with "rw" mode.
*/
public DrmOutputStream(DrmManagerClient client, RandomAccessFile file, String mimeType)
throws IOException {
mClient = client;
mFile = file;
mSessionId = mClient.openConvertSession(mimeType);
if (mSessionId == INVALID_SESSION) {
throw new UnknownServiceException("Failed to open DRM session for " + mimeType);
}
}
public void finish() throws IOException {
final DrmConvertedStatus status = mClient.closeConvertSession(mSessionId);
if (status.statusCode == STATUS_OK) {
mFile.seek(status.offset);
mFile.write(status.convertedData);
mSessionId = INVALID_SESSION;
} else {
throw new IOException("Unexpected DRM status: " + status.statusCode);
}
}
@Override
public void close() throws IOException {
if (mSessionId == INVALID_SESSION) {
Log.w(TAG, "Closing stream without finishing");
}
mFile.close();
}
@Override
public void write(byte[] buffer, int offset, int count) throws IOException {
Arrays.checkOffsetAndCount(buffer.length, offset, count);
final byte[] exactBuffer;
if (count == buffer.length) {
exactBuffer = buffer;
} else {
exactBuffer = new byte[count];
System.arraycopy(buffer, offset, exactBuffer, 0, count);
}
final DrmConvertedStatus status = mClient.convertData(mSessionId, exactBuffer);
if (status.statusCode == STATUS_OK) {
mFile.write(status.convertedData);
} else {
throw new IOException("Unexpected DRM status: " + status.statusCode);
}
}
@Override
public void write(int oneByte) throws IOException {
Streams.writeSingleByte(this, oneByte);
}
}
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