| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.jkernel; |
| |
| /** |
| * TODO: The JRE and deploy build code (SplitJRE) can be made a bit smarter |
| * then cryto hashcode byte arrays can be used directly, eliminating the need |
| * for this class altogether. So just leave this alone until it can be removed. |
| * TODO: Change "Digits" to "String" for uniformity and more intuitive names. |
| * A lightweight class to provide convert between hex digits and |
| * <code>byte[]</code>. |
| *<p> |
| * TODO: Try to get this built without the -source 1.3 -target -1.3 options, |
| * which prevent use of java.text.Format, assuming this wouldn't bloat the |
| * JK rt.jar. Also, there still might be equivalent code hiding in the JDK |
| * already, but preliminary searches havn't found it. |
| */ |
| |
| public final class ByteArrayToFromHexDigits { |
| |
| private static final char [] chars = new char[] |
| {'0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F'}; |
| |
| private static final boolean debug = false; |
| |
| /** |
| * Converts the <code>byte[] b</code> into a <code>String</code> of |
| * hex digits representing the integer values of all the bytes. |
| * |
| * @param b byte array to be converted |
| * @return String representing <code>b</code> in hexadecimal |
| * @throws IllegalArgumentException if <code>b</code> is null or zero length |
| */ |
| public static String bytesToHexString(byte[] b) { |
| if (debug ) { |
| System.out.print("I: "); |
| for(int i=0;i<b.length;i++) { |
| System.out.format("%02X",b[i]); |
| } |
| System.out.println(); |
| } |
| if ((b == null) || (b.length == 0)) { |
| throw new IllegalArgumentException("argument null or zero length"); |
| } |
| StringBuffer buff = new StringBuffer(b.length * 2); |
| for (int i = 0; i < b.length; i++ ) { |
| buff.insert(i*2,chars[(b[i] >> 4) & 0xf]); |
| buff.insert(i*2+1,chars[b[i] & 0xf]); |
| } |
| if (debug ) { |
| System.out.println("O: " + buff.toString()); |
| } |
| return buff.toString(); |
| } |
| |
| // Convert one hex character to a 4 bit byte value |
| |
| private static byte hexCharToByte(char c) throws IllegalArgumentException { |
| if ((c < '0') || |
| ( ((c < 'A') && (c > 'F')) && ((c < 'a') && (c > 'f'))) ) { |
| |
| throw new IllegalArgumentException("not a hex digit"); |
| } |
| |
| if (c > '9') { |
| if (c > 'F') { |
| return (byte) ((c - 'a' + 10) & 0xf); |
| } else { |
| return (byte) ((c - 'A' + 10) & 0xf); |
| } |
| } else { |
| return (byte) ((c - '0') & 0xf); |
| } |
| |
| } |
| |
| /** |
| * Converts the <code>String d</code> assumed to contain a sequence |
| * of hexadecimal digit characters into a <code>byte[]</code>. |
| * |
| * @param d String to be converted |
| * @return byte array representing the hex string |
| * @throws IllegalArgumentException if <code>d</code> is odd length, |
| * contains a character outside the ranges of 0-9, a-f, and A-F, |
| * or is zero length or null |
| */ |
| |
| public static byte[] hexStringToBytes(String d) throws IllegalArgumentException { |
| if (d == null) { |
| throw new IllegalArgumentException( |
| "parameter cannot be null"); |
| } |
| |
| if (d.length() == 0) { |
| throw new IllegalArgumentException( |
| "parameter cannot be zero length"); |
| } |
| |
| if ((d.length() & 1) != 0) { |
| throw new IllegalArgumentException( |
| "odd length string"); |
| } |
| |
| byte[] b = new byte[d.length() / 2]; |
| |
| // TODO Might be code in the JK initial bundle to do this better (i.e. |
| // method that tests for a hex char?) |
| |
| for (int i=0;i<d.length();i+=2) { |
| b[i/2] = (byte) (( (byte) (hexCharToByte(d.charAt(i))) << 4) + |
| (byte) hexCharToByte(d.charAt(i+1))); |
| } |
| return b; |
| } |
| } |