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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.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.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
/** A {@link DataSource} for reading local files. */
public final class FileDataSource extends BaseDataSource {
/** Thrown when a {@link FileDataSource} encounters an error reading a file. */
public static class FileDataSourceException extends IOException {
public FileDataSourceException(IOException cause) {
super(cause);
}
public FileDataSourceException(String message, IOException cause) {
super(message, cause);
}
}
/** {@link DataSource.Factory} for {@link FileDataSource} instances. */
public static final class Factory implements DataSource.Factory {
@Nullable private TransferListener listener;
/**
* Sets a {@link TransferListener} for {@link FileDataSource} instances created by this factory.
*
* @param listener The {@link TransferListener}.
* @return This factory.
*/
public Factory setListener(@Nullable TransferListener listener) {
this.listener = listener;
return this;
}
@Override
public FileDataSource createDataSource() {
FileDataSource dataSource = new FileDataSource();
if (listener != null) {
dataSource.addTransferListener(listener);
}
return dataSource;
}
}
@Nullable private RandomAccessFile file;
@Nullable private Uri uri;
private long bytesRemaining;
private boolean opened;
public FileDataSource() {
super(/* isNetwork= */ false);
}
@Override
public long open(DataSpec dataSpec) throws FileDataSourceException {
try {
Uri uri = dataSpec.uri;
this.uri = uri;
transferInitializing(dataSpec);
this.file = openLocalFile(uri);
file.seek(dataSpec.position);
bytesRemaining = dataSpec.length == C.LENGTH_UNSET ? file.length() - dataSpec.position
: dataSpec.length;
if (bytesRemaining < 0) {
throw new EOFException();
}
} catch (IOException e) {
throw new FileDataSourceException(e);
}
opened = true;
transferStarted(dataSpec);
return bytesRemaining;
}
private static RandomAccessFile openLocalFile(Uri uri) throws FileDataSourceException {
try {
return new RandomAccessFile(Assertions.checkNotNull(uri.getPath()), "r");
} catch (FileNotFoundException e) {
if (!TextUtils.isEmpty(uri.getQuery()) || !TextUtils.isEmpty(uri.getFragment())) {
throw new FileDataSourceException(
String.format(
"uri has query and/or fragment, which are not supported. Did you call Uri.parse()"
+ " on a string containing '?' or '#'? Use Uri.fromFile(new File(path)) to"
+ " avoid this. path=%s,query=%s,fragment=%s",
uri.getPath(), uri.getQuery(), uri.getFragment()),
e);
}
throw new FileDataSourceException(e);
}
}
@Override
public int read(byte[] buffer, int offset, int readLength) throws FileDataSourceException {
if (readLength == 0) {
return 0;
} else if (bytesRemaining == 0) {
return C.RESULT_END_OF_INPUT;
} else {
int bytesRead;
try {
bytesRead =
castNonNull(file).read(buffer, offset, (int) Math.min(bytesRemaining, readLength));
} catch (IOException e) {
throw new FileDataSourceException(e);
}
if (bytesRead > 0) {
bytesRemaining -= bytesRead;
bytesTransferred(bytesRead);
}
return bytesRead;
}
}
@Override
@Nullable
public Uri getUri() {
return uri;
}
@Override
public void close() throws FileDataSourceException {
uri = null;
try {
if (file != null) {
file.close();
}
} catch (IOException e) {
throw new FileDataSourceException(e);
} finally {
file = null;
if (opened) {
opened = false;
transferEnded();
}
}
}
}
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