1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.drm; 18 19 import static android.drm.DrmConvertedStatus.STATUS_OK; 20 import static android.drm.DrmManagerClient.INVALID_SESSION; 21 import static android.system.OsConstants.SEEK_SET; 22 23 import android.os.ParcelFileDescriptor; 24 import android.system.ErrnoException; 25 import android.system.Os; 26 import android.util.Log; 27 28 import libcore.io.IoBridge; 29 import libcore.io.Streams; 30 31 import java.io.FileDescriptor; 32 import java.io.FilterOutputStream; 33 import java.io.IOException; 34 import java.io.OutputStream; 35 import java.net.UnknownServiceException; 36 import java.util.Arrays; 37 38 /** 39 * Stream that applies a {@link DrmManagerClient} transformation to data before 40 * writing to disk, similar to a {@link FilterOutputStream}. 41 * 42 * @hide 43 */ 44 public class DrmOutputStream extends OutputStream { 45 private static final String TAG = "DrmOutputStream"; 46 47 private final DrmManagerClient mClient; 48 private final ParcelFileDescriptor mPfd; 49 private final FileDescriptor mFd; 50 51 private int mSessionId = INVALID_SESSION; 52 53 /** 54 * @param pfd Opened with "rw" mode. 55 */ DrmOutputStream(DrmManagerClient client, ParcelFileDescriptor pfd, String mimeType)56 public DrmOutputStream(DrmManagerClient client, ParcelFileDescriptor pfd, String mimeType) 57 throws IOException { 58 mClient = client; 59 mPfd = pfd; 60 mFd = pfd.getFileDescriptor(); 61 62 mSessionId = mClient.openConvertSession(mimeType); 63 if (mSessionId == INVALID_SESSION) { 64 throw new UnknownServiceException("Failed to open DRM session for " + mimeType); 65 } 66 } 67 finish()68 public void finish() throws IOException { 69 final DrmConvertedStatus status = mClient.closeConvertSession(mSessionId); 70 if (status.statusCode == STATUS_OK) { 71 try { 72 Os.lseek(mFd, status.offset, SEEK_SET); 73 } catch (ErrnoException e) { 74 e.rethrowAsIOException(); 75 } 76 IoBridge.write(mFd, status.convertedData, 0, status.convertedData.length); 77 mSessionId = INVALID_SESSION; 78 } else { 79 throw new IOException("Unexpected DRM status: " + status.statusCode); 80 } 81 } 82 83 @Override close()84 public void close() throws IOException { 85 if (mSessionId == INVALID_SESSION) { 86 Log.w(TAG, "Closing stream without finishing"); 87 } 88 89 mPfd.close(); 90 } 91 92 @Override write(byte[] buffer, int offset, int count)93 public void write(byte[] buffer, int offset, int count) throws IOException { 94 Arrays.checkOffsetAndCount(buffer.length, offset, count); 95 96 final byte[] exactBuffer; 97 if (count == buffer.length) { 98 exactBuffer = buffer; 99 } else { 100 exactBuffer = new byte[count]; 101 System.arraycopy(buffer, offset, exactBuffer, 0, count); 102 } 103 104 final DrmConvertedStatus status = mClient.convertData(mSessionId, exactBuffer); 105 if (status.statusCode == STATUS_OK) { 106 IoBridge.write(mFd, status.convertedData, 0, status.convertedData.length); 107 } else { 108 throw new IOException("Unexpected DRM status: " + status.statusCode); 109 } 110 } 111 112 @Override write(int oneByte)113 public void write(int oneByte) throws IOException { 114 Streams.writeSingleByte(this, oneByte); 115 } 116 } 117