package org.apache.poi.util;
import java.io.OutputStream;
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) {
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;
}
}