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//******************************************************************************
//
// File: OutputBitStream.java
// Package: edu.rit.image
// Unit: Class edu.rit.image.OutputBitStream
//
// This Java source file is copyright (C) 2008 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.image;
import java.io.DataOutputStream;
import java.io.IOException;
/**
* Class OutputBitStream provides an object for writing a stream of bits to an
* output stream.
*
* @author Alan Kaminsky
* @version 08-Apr-2008
*/
class OutputBitStream
{
// Hidden data members.
private DataOutputStream dos;
private int outData;
private int outBits;
// Exported constructors.
/**
* Construct a new output bit stream on top of the given data output
* stream.
*
* @param dos Data output stream.
*/
public OutputBitStream
(DataOutputStream dos)
{
this.dos = dos;
}
// Exported operations.
/**
* Write the given number of least significant bits of the given value.
*
* @param data Data value.
* @param bits Number of bits.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void writeBits
(int data,
int bits)
throws IOException
{
outData = (outData << bits) | data;
outBits += bits;
while (outBits >= 8)
{
dos.writeByte (outData >> (outBits - 8));
outBits -= 8;
}
}
/**
* Flush any remaining accumulated bits.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void flush()
throws IOException
{
while (outBits >= 8)
{
dos.writeByte (outData >> (outBits - 8));
outBits -= 8;
}
if (outBits > 0)
{
dos.writeByte (outData << (8 - outBits));
}
}
}
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