ByteBufferOutputStream.java
/*
* Copyright 2022 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 androidx.camera.core.internal;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import java.io.EOFException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
/**
* A {@link OutputStream} that wraps around a {@link ByteBuffer}.
*/
@RequiresApi(21)
public final class ByteBufferOutputStream extends OutputStream {
private final ByteBuffer mByteBuffer;
public ByteBufferOutputStream(@NonNull ByteBuffer buf) {
mByteBuffer = buf;
}
@Override
public void write(int b) throws IOException {
if (!mByteBuffer.hasRemaining()) {
throw new EOFException("Output ByteBuffer has no bytes remaining.");
}
mByteBuffer.put((byte) b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0)
|| ((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
} else if (mByteBuffer.remaining() < len) {
throw new EOFException("Output ByteBuffer has insufficient bytes remaining.");
}
mByteBuffer.put(b, off, len);
}
}