Here you can find the source of hexToBits(String s, BitSet ba, int length)
| Parameter | Description |
|---|---|
| s | hex string of the stored bits |
| ba | the bitset to store the bits in |
| length | the maximum number of bits to store |
public static void hexToBits(String s, BitSet ba, int length)
//package com.java2s; /*/* w ww .j ava 2 s. c o m*/ * JGrass - Free Open Source Java GIS http://www.jgrass.org * (C) HydroloGIS - www.hydrologis.com * * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Library General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) any * later version. * * This library 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 Library General Public License for more * details. * * You should have received a copy of the GNU Library General Public License * along with this library; if not, write to the Free Foundation, Inc., 59 * Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import java.util.BitSet; public class Main { /** * Read a hex string of bits and write it into a bitset * @param s hex string of the stored bits * @param ba the bitset to store the bits in * @param length the maximum number of bits to store */ public static void hexToBits(String s, BitSet ba, int length) { byte[] b = hexToBytes(s); bytesToBits(b, ba, length); } public static final byte[] hexToBytes(String s) { return hexToBytes(s, 0); } public static final byte[] hexToBytes(String s, int off) { byte[] bs = new byte[off + (1 + s.length()) / 2]; hexToBytes(s, bs, off); return bs; } /** * Converts a String of hex characters into an array of bytes. * * @param s * A string of hex characters (upper case or lower) of even * length. * @param out * A byte array of length at least s.length()/2 + off * @param off * The first byte to write of the array */ public static final void hexToBytes(String s, byte[] out, int off) throws NumberFormatException, IndexOutOfBoundsException { int slen = s.length(); if ((slen % 2) != 0) { s = '0' + s; } if (out.length < off + slen / 2) { throw new IndexOutOfBoundsException( "Output buffer too small for input (" + out.length + "<" + off + slen / 2 + ")"); } // Safe to assume the string is even length byte b1, b2; for (int i = 0; i < slen; i += 2) { b1 = (byte) Character.digit(s.charAt(i), 16); b2 = (byte) Character.digit(s.charAt(i + 1), 16); if (b1 < 0 || b2 < 0) { throw new NumberFormatException(); } out[off + i / 2] = (byte) (b1 << 4 | b2); } } /** * Read bits from a byte array into a bitset * @param b the byte[] to read from * @param ba the bitset to write to */ public static void bytesToBits(byte[] b, BitSet ba, int maxSize) { int x = 0; for (int i = 0; i < b.length; i++) { for (int j = 0; j < 8; j++) { if (x > maxSize) break; int mask = 1 << j; boolean value = (mask & b[i]) != 0; ba.set(x, value); x++; } } } }