ByteOrderedDataOutputStream.java
/*
* Copyright 2020 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.impl.utils;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteOrder;
/**
* An output stream to write EXIF data area, which can be written in either little or big endian
* order.
*/
// Note: This class is adapted from {@link androidx.exifinterface.media.ExifInterface}
class ByteOrderedDataOutputStream extends FilterOutputStream {
final OutputStream mOutputStream;
private ByteOrder mByteOrder;
ByteOrderedDataOutputStream(OutputStream out, ByteOrder byteOrder) {
super(out);
mOutputStream = out;
mByteOrder = byteOrder;
}
public void setByteOrder(ByteOrder byteOrder) {
mByteOrder = byteOrder;
}
@Override
public void write(byte[] bytes) throws IOException {
mOutputStream.write(bytes);
}
@Override
public void write(byte[] bytes, int offset, int length) throws IOException {
mOutputStream.write(bytes, offset, length);
}
public void writeByte(int val) throws IOException {
mOutputStream.write(val);
}
public void writeShort(short val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeInt(int val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 24) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 24) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeUnsignedShort(int val) throws IOException {
writeShort((short) val);
}
public void writeUnsignedInt(long val) throws IOException {
writeInt((int) val);
}
}