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/*
* Copyright (C) 2017 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.util.Base64;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ParserException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.io.IOException;
import java.net.URLDecoder;
/** A {@link DataSource} for reading data URLs, as defined by RFC 2397. */
public final class DataSchemeDataSource extends BaseDataSource {
public static final String SCHEME_DATA = "data";
@Nullable private DataSpec dataSpec;
@Nullable private byte[] data;
private int endPosition;
private int readPosition;
// the constructor does not initialize fields: data
@SuppressWarnings("nullness:initialization.fields.uninitialized")
public DataSchemeDataSource() {
super(/* isNetwork= */ false);
}
@Override
public long open(DataSpec dataSpec) throws IOException {
transferInitializing(dataSpec);
this.dataSpec = dataSpec;
readPosition = (int) dataSpec.position;
Uri uri = dataSpec.uri;
String scheme = uri.getScheme();
if (!SCHEME_DATA.equals(scheme)) {
throw new ParserException("Unsupported scheme: " + scheme);
}
String[] uriParts = Util.split(uri.getSchemeSpecificPart(), ",");
if (uriParts.length != 2) {
throw new ParserException("Unexpected URI format: " + uri);
}
String dataString = uriParts[1];
if (uriParts[0].contains(";base64")) {
try {
data = Base64.decode(dataString, 0);
} catch (IllegalArgumentException e) {
throw new ParserException("Error while parsing Base64 encoded string: " + dataString, e);
}
} else {
// TODO: Add support for other charsets.
data = Util.getUtf8Bytes(URLDecoder.decode(dataString, C.ASCII_NAME));
}
endPosition =
dataSpec.length != C.LENGTH_UNSET ? (int) dataSpec.length + readPosition : data.length;
if (endPosition > data.length || readPosition > endPosition) {
data = null;
throw new DataSourceException(DataSourceException.POSITION_OUT_OF_RANGE);
}
transferStarted(dataSpec);
return (long) endPosition - readPosition;
}
@Override
public int read(byte[] buffer, int offset, int readLength) {
if (readLength == 0) {
return 0;
}
int remainingBytes = endPosition - readPosition;
if (remainingBytes == 0) {
return C.RESULT_END_OF_INPUT;
}
readLength = Math.min(readLength, remainingBytes);
System.arraycopy(castNonNull(data), readPosition, buffer, offset, readLength);
readPosition += readLength;
bytesTransferred(readLength);
return readLength;
}
@Override
@Nullable
public Uri getUri() {
return dataSpec != null ? dataSpec.uri : null;
}
@Override
public void close() {
if (data != null) {
data = null;
transferEnded();
}
dataSpec = null;
}
}
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