Java Bit String From toBitString(final byte[] b)

Description

Return the binary representation of the unsigned byte[].

License

Open Source License

Parameter

Parameter	Description
b	The unsigned byte[].

Exception

Parameter	Description
IllegalArgumentException	if the argument is <code>null</code>.

Return

The representation of the bits in that unsigned byte[].

Declaration

public static String toBitString(final byte[] b) 

Method Source Code

//package com.java2s;
/**/*from  ww w.j ava  2  s . c o  m*/
    
Copyright (C) SYSTAP, LLC 2006-2007.  All rights reserved.
    
Contact:
 SYSTAP, LLC
 4501 Tower Road
 Greensboro, NC 27410
 licenses@bigdata.com
    
This program 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; version 2 of the License.
    
This program 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.
    
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

public class Main {
    /** binary digits. */
    private final static char[] bits = { '0', '1' };

    /**
     * Return the binary representation of the unsigned byte[].
     * 
     * @param b
     *            The unsigned byte[].
     * 
     * @return The representation of the bits in that unsigned byte[].
     * 
     * @throws IllegalArgumentException
     *             if the argument is <code>null</code>.
     */
    public static String toBitString(final byte[] b) {
        if (b == null)// Note: fromKey/toKey may be null; caller must check 1st
            throw new IllegalArgumentException();
        final char[] chars = new char[b.length << 3]; // one char per bit.
        int bitIndex = 0; // start at the msb.
        for (int i = 0; i < b.length; i++) {
            final byte x = b[i]; // next byte.
            for (int withinByteIndex = 7; withinByteIndex >= 0; withinByteIndex--) {
                final int mask = 1 << withinByteIndex;
                final boolean bit = (x & mask) != 0;
                chars[bitIndex++] = bits[bit ? 1 : 0];
            } // next bit in the current byte.
        } // next byte in the byte[].
          // System.err.println("b[]=" + BytesUtil.toString(b) + ", chars="
          // + Arrays.toString(chars));
        return new String(chars);
    }
}

Related

1. toBitString(byte[] bytes)
2. toBitString(byte[] bytes)
3. toBitString(byte[] bytes, final int digitsPerGroup, final String groupSeparator)
4. toBitString(byte[] data)
5. toBitString(final byte n)
6. toBitString(final byte[] b)
7. toBitString(final double d)
8. toBitString(final StringBuilder sb, final byte value, final int count2)
9. toBitString(int i)