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/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.apache.poi.util;
import java.io.OutputStream;
/**
* Adapts a plain byte array to {@link LittleEndianOutput}
*/
public final class LittleEndianByteArrayOutputStream extends OutputStream implements LittleEndianOutput, DelayableLittleEndianOutput {
private final byte[] _buf;
private final int _endIndex;
private int _writeIndex;
public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset, int maxWriteLen) { // NOSONAR
if (startOffset < 0 || startOffset > buf.length) {
throw new IllegalArgumentException("Specified startOffset (" + startOffset
+ ") is out of allowable range (0.." + buf.length + ")");
}
_buf = buf;
_writeIndex = startOffset;
_endIndex = startOffset + maxWriteLen;
if (_endIndex < startOffset || _endIndex > buf.length) {
throw new IllegalArgumentException("calculated end index (" + _endIndex
+ ") is out of allowable range (" + _writeIndex + ".." + buf.length + ")");
}
}
public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset) {
this(buf, startOffset, buf.length - startOffset);
}
private void checkPosition(int i) {
if (i > _endIndex - _writeIndex) {
throw new RuntimeException("Buffer overrun");
}
}
@Override
public void writeByte(int v) {
checkPosition(1);
_buf[_writeIndex++] = (byte)v;
}
@Override
public void writeDouble(double v) {
writeLong(Double.doubleToLongBits(v));
}
@Override
public void writeInt(int v) {
checkPosition(4);
int i = _writeIndex;
_buf[i++] = (byte)((v >>> 0) & 0xFF);
_buf[i++] = (byte)((v >>> 8) & 0xFF);
_buf[i++] = (byte)((v >>> 16) & 0xFF);
_buf[i++] = (byte)((v >>> 24) & 0xFF);
_writeIndex = i;
}
@Override
public void writeLong(long v) {
writeInt((int)(v >> 0));
writeInt((int)(v >> 32));
}
@Override
public void writeShort(int v) {
checkPosition(2);
int i = _writeIndex;
_buf[i++] = (byte)((v >>> 0) & 0xFF);
_buf[i++] = (byte)((v >>> 8) & 0xFF);
_writeIndex = i;
}
@Override
public void write(int b) {
writeByte(b);
}
@Override
public void write(byte[] b) {
int len = b.length;
checkPosition(len);
System.arraycopy(b, 0, _buf, _writeIndex, len);
_writeIndex += len;
}
@Override
public void write(byte[] b, int offset, int len) {
checkPosition(len);
System.arraycopy(b, offset, _buf, _writeIndex, len);
_writeIndex += len;
}
public int getWriteIndex() {
return _writeIndex;
}
@Override
public LittleEndianOutput createDelayedOutput(int size) {
checkPosition(size);
LittleEndianOutput result = new LittleEndianByteArrayOutputStream(_buf, _writeIndex, size);
_writeIndex += size;
return result;
}
}
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