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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.ContentResolver;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.channels.FileChannel;
/** A {@link DataSource} for reading from a content URI. */
public final class ContentDataSource extends BaseDataSource {
/**
* Thrown when an {@link IOException} is encountered reading from a content URI.
*/
public static class ContentDataSourceException extends IOException {
public ContentDataSourceException(IOException cause) {
super(cause);
}
}
private final ContentResolver resolver;
@Nullable private Uri uri;
@Nullable private AssetFileDescriptor assetFileDescriptor;
@Nullable private FileInputStream inputStream;
private long bytesRemaining;
private boolean opened;
/**
* @param context A context.
*/
public ContentDataSource(Context context) {
super(/* isNetwork= */ false);
this.resolver = context.getContentResolver();
}
@Override
public long open(DataSpec dataSpec) throws ContentDataSourceException {
try {
Uri uri = dataSpec.uri;
this.uri = uri;
transferInitializing(dataSpec);
AssetFileDescriptor assetFileDescriptor = resolver.openAssetFileDescriptor(uri, "r");
this.assetFileDescriptor = assetFileDescriptor;
if (assetFileDescriptor == null) {
throw new FileNotFoundException("Could not open file descriptor for: " + uri);
}
FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
this.inputStream = inputStream;
long assetStartOffset = assetFileDescriptor.getStartOffset();
long skipped = inputStream.skip(assetStartOffset + dataSpec.position) - assetStartOffset;
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 (assetFileDescriptorLength == AssetFileDescriptor.UNKNOWN_LENGTH) {
// The asset must extend to the end of the file. If FileInputStream.getChannel().size()
// returns 0 then the remaining length cannot be determined.
FileChannel channel = inputStream.getChannel();
long channelSize = channel.size();
bytesRemaining = channelSize == 0 ? C.LENGTH_UNSET : channelSize - channel.position();
} else {
bytesRemaining = assetFileDescriptorLength - skipped;
}
}
} catch (IOException e) {
throw new ContentDataSourceException(e);
}
opened = true;
transferStarted(dataSpec);
return bytesRemaining;
}
@Override
public int read(byte[] buffer, int offset, int readLength) throws ContentDataSourceException {
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 ContentDataSourceException(e);
}
if (bytesRead == -1) {
if (bytesRemaining != C.LENGTH_UNSET) {
// End of stream reached having not read sufficient data.
throw new ContentDataSourceException(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 ContentDataSourceException {
uri = null;
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
throw new ContentDataSourceException(e);
} finally {
inputStream = null;
try {
if (assetFileDescriptor != null) {
assetFileDescriptor.close();
}
} catch (IOException e) {
throw new ContentDataSourceException(e);
} finally {
assetFileDescriptor = null;
if (opened) {
opened = false;
transferEnded();
}
}
}
}
}
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