Java BitSet Create byte2BitSet(byte[] b, int offset, boolean bitZeroMeansExtended)

Description

Converts a binary representation of a Bitmap field into a Java BitSet

License

Open Source License

Parameter

Parameter	Description
b	- binary representation
offset	- staring offset
bitZeroMeansExtended	- true for ISO-8583

Return

java BitSet object

Declaration

public static BitSet byte2BitSet(byte[] b, int offset, boolean bitZeroMeansExtended) 

Method Source Code

//package com.java2s;
/*// w w  w  .  j  ava  2  s. c o m
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2012 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.BitSet;

public class Main {
    /**
     * Converts a binary representation of a Bitmap field into a Java BitSet
     * 
     * @param b - binary representation
     * @param offset - staring offset
     * @param bitZeroMeansExtended - true for ISO-8583
     * @return java BitSet object
     */
    public static BitSet byte2BitSet(byte[] b, int offset, boolean bitZeroMeansExtended) {
        int len = bitZeroMeansExtended ? ((b[offset] & 0x80) == 0x80 ? 128 : 64) : 64;
        BitSet bmap = new BitSet(len);
        for (int i = 0; i < len; i++)
            if (((b[offset + (i >> 3)]) & (0x80 >> (i % 8))) > 0)
                bmap.set(i + 1);
        return bmap;
    }

    /**
     * Converts a binary representation of a Bitmap field into a Java BitSet
     * 
     * @param b - binary representation
     * @param offset - staring offset
     * @param maxBits - max number of bits (supports 64,128 or 192)
     * @return java BitSet object
     */
    public static BitSet byte2BitSet(byte[] b, int offset, int maxBits) {
        int len = maxBits > 64 ? ((b[offset] & 0x80) == 0x80 ? 128 : 64) : maxBits;
        if (maxBits > 128 && b.length > offset + 8 && (b[offset + 8] & 0x80) == 0x80) {
            len = 192;
        }
        BitSet bmap = new BitSet(len);
        for (int i = 0; i < len; i++)
            if (((b[offset + (i >> 3)]) & (0x80 >> (i % 8))) > 0)
                bmap.set(i + 1);
        return bmap;
    }

    /**
     * Converts a binary representation of a Bitmap field into a Java BitSet
     * 
     * @param bmap - BitSet
     * @param b - hex representation
     * @param bitOffset - (i.e. 0 for primary bitmap, 64 for secondary)
     * @return java BitSet object
     */
    public static BitSet byte2BitSet(BitSet bmap, byte[] b, int bitOffset) {
        int len = b.length << 3;
        for (int i = 0; i < len; i++)
            if (((b[i >> 3]) & (0x80 >> (i % 8))) > 0)
                bmap.set(bitOffset + i + 1);
        return bmap;
    }
}

Related

1. bitsetFromString(String pixelsString)
2. bitSetOf(long lowerBits, long upperBits)
3. bitSetOf(String inString)
4. bitSetOfIndexes(int... indexes)
5. Byte2BitSet(byte bytes)
6. byte2BitSet(byte[] b, int offset, int maxBits)
7. convert(final long value)
8. convert(long value, int bitSetOffset, BitSet bits)
9. convertIntToBitSet(int value)