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/*
* Copyright (C) 2019 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.extractor;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import java.io.IOException;
/** Extractor related utility methods. */
/* package */ final class ExtractorUtil {
/**
* Peeks {@code length} bytes from the input peek position, or all the bytes to the end of the
* input if there was less than {@code length} bytes left.
*
* <p>If an exception is thrown, there is no guarantee on the peek position.
*
* @param input The stream input to peek the data from.
* @param target A target array into which data should be written.
* @param offset The offset into the target array at which to write.
* @param length The maximum number of bytes to peek from the input.
* @return The number of bytes peeked.
* @throws IOException If an error occurs peeking from the input.
* @throws InterruptedException If the thread has been interrupted.
*/
public static int peekToLength(ExtractorInput input, byte[] target, int offset, int length)
throws IOException, InterruptedException {
int totalBytesPeeked = 0;
while (totalBytesPeeked < length) {
int bytesPeeked = input.peek(target, offset + totalBytesPeeked, length - totalBytesPeeked);
if (bytesPeeked == C.RESULT_END_OF_INPUT) {
break;
}
totalBytesPeeked += bytesPeeked;
}
return totalBytesPeeked;
}
private ExtractorUtil() {}
}
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