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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.upstream;
import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util.castNonNull;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.Resources;
import android.net.Uri;
import android.text.TextUtils;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A {@link DataSource} for reading a raw resource inside the APK.
*
* <p>URIs supported by this source are of the form {@code rawresource:///rawResourceId}, where
* rawResourceId is the integer identifier of a raw resource. {@link #buildRawResourceUri(int)} can
* be used to build {@link Uri}s in this format.
*/
public final class RawResourceDataSource extends BaseDataSource {
/**
* Thrown when an {@link IOException} is encountered reading from a raw resource.
*/
public static class RawResourceDataSourceException extends IOException {
public RawResourceDataSourceException(String message) {
super(message);
}
public RawResourceDataSourceException(IOException e) {
super(e);
}
}
/**
* Builds a {@link Uri} for the specified raw resource identifier.
*
* @param rawResourceId A raw resource identifier (i.e. a constant defined in {@code R.raw}).
* @return The corresponding {@link Uri}.
*/
public static Uri buildRawResourceUri(int rawResourceId) {
return Uri.parse(RAW_RESOURCE_SCHEME + ":///" + rawResourceId);
}
/** The scheme part of a raw resource URI. */
public static final String RAW_RESOURCE_SCHEME = "rawresource";
private final Resources resources;
@Nullable private Uri uri;
@Nullable private AssetFileDescriptor assetFileDescriptor;
@Nullable private InputStream inputStream;
private long bytesRemaining;
private boolean opened;
/**
* @param context A context.
*/
public RawResourceDataSource(Context context) {
super(/* isNetwork= */ false);
this.resources = context.getResources();
}
@Override
public long open(DataSpec dataSpec) throws RawResourceDataSourceException {
try {
Uri uri = dataSpec.uri;
this.uri = uri;
if (!TextUtils.equals(RAW_RESOURCE_SCHEME, uri.getScheme())) {
throw new RawResourceDataSourceException("URI must use scheme " + RAW_RESOURCE_SCHEME);
}
int resourceId;
try {
resourceId = Integer.parseInt(Assertions.checkNotNull(uri.getLastPathSegment()));
} catch (NumberFormatException e) {
throw new RawResourceDataSourceException("Resource identifier must be an integer.");
}
transferInitializing(dataSpec);
AssetFileDescriptor assetFileDescriptor = resources.openRawResourceFd(resourceId);
this.assetFileDescriptor = assetFileDescriptor;
if (assetFileDescriptor == null) {
throw new RawResourceDataSourceException("Resource is compressed: " + uri);
}
FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
this.inputStream = inputStream;
inputStream.skip(assetFileDescriptor.getStartOffset());
long skipped = inputStream.skip(dataSpec.position);
if (skipped < dataSpec.position) {
// We expect the skip to be satisfied in full. If it isn't then we're probably trying to
// skip beyond the end of the data.
throw new EOFException();
}
if (dataSpec.length != C.LENGTH_UNSET) {
bytesRemaining = dataSpec.length;
} else {
long assetFileDescriptorLength = assetFileDescriptor.getLength();
// If the length is UNKNOWN_LENGTH then the asset extends to the end of the file.
bytesRemaining = assetFileDescriptorLength == AssetFileDescriptor.UNKNOWN_LENGTH
? C.LENGTH_UNSET : (assetFileDescriptorLength - dataSpec.position);
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
}
opened = true;
transferStarted(dataSpec);
return bytesRemaining;
}
@Override
public int read(byte[] buffer, int offset, int readLength) throws RawResourceDataSourceException {
if (readLength == 0) {
return 0;
} else if (bytesRemaining == 0) {
return C.RESULT_END_OF_INPUT;
}
int bytesRead;
try {
int bytesToRead = bytesRemaining == C.LENGTH_UNSET ? readLength
: (int) Math.min(bytesRemaining, readLength);
bytesRead = castNonNull(inputStream).read(buffer, offset, bytesToRead);
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
}
if (bytesRead == -1) {
if (bytesRemaining != C.LENGTH_UNSET) {
// End of stream reached having not read sufficient data.
throw new RawResourceDataSourceException(new EOFException());
}
return C.RESULT_END_OF_INPUT;
}
if (bytesRemaining != C.LENGTH_UNSET) {
bytesRemaining -= bytesRead;
}
bytesTransferred(bytesRead);
return bytesRead;
}
@Override
@Nullable
public Uri getUri() {
return uri;
}
@SuppressWarnings("Finally")
@Override
public void close() throws RawResourceDataSourceException {
uri = null;
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
} finally {
inputStream = null;
try {
if (assetFileDescriptor != null) {
assetFileDescriptor.close();
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
} finally {
assetFileDescriptor = null;
if (opened) {
opened = false;
transferEnded();
}
}
}
}
}
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