Source Code : Bit InputStream

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Bit InputStream

     
/*
 * @(#)$Id$
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * 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.
 * 
 * Contributors:
 *     Makoto YUI - initial implementation
 */
//package xbird.util.io;

import java.io.*;

/**
 * 
 * <DIV lang="en"></DIV>
 * <DIV lang="ja"></DIV>
 * 
 * @author Makoto YUI (yuin405+xbird@gmail.com)
 */
public final class BitInputStream extends DataInputStream {

    public static final int MAX_BITS = 31;

    private int leftBits = 0;
    private int byteBuf = 0;

    public BitInputStream(InputStream in) {
        super(in);
    }

    public final boolean readBit() throws IOException {
        if(--leftBits >= 0) {
            return ((byteBuf >>> leftBits) & 1) == 1;
        }
        leftBits = 7;
        byteBuf = in.read();
        if(byteBuf == -1) {
            throw new EOFException("reached end of stream");
        }
        return ((byteBuf >>> 7) & 1) == 1;
    }

    public final int readBits(int n) throws IOException {
        int x = 0;
        while(n > leftBits) {
            n -= leftBits;
            x |= rightBits(leftBits, byteBuf) << n;
            byteBuf = in.read();
            if(byteBuf == -1) {
                throw new EOFException("reached end of stream");
            }
            leftBits = 8;
        }
        leftBits -= n;
        return x | rightBits(n, byteBuf >>> leftBits);
    }

    private static final int rightBits(int n, int x) {
        return x & ((1 << n) - 1);
    }
}

   
    
    
    
    
  

Thank with us