Source Code Cross Referenced for HexUtil.java in  » Workflow-Engines » xflow1.2 » xflow » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » xflow1.2 » xflow.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         *
004:         * XFLOW - Process Management System
005:         * Copyright (C) 2003 Rob Tan
006:         * All rights reserved.
007:         *
008:         * Redistribution and use in source and binary forms, with or without
009:         * modification, are permitted provided that the following conditions
010:         * are met:
011:         * 
012:         * 1. Redistributions of source code must retain the above copyright
013:         *    notice, this list of conditions, and the following disclaimer.
014:         *
015:         * 2. Redistributions in binary form must reproduce the above copyright
016:         *    notice, this list of conditions, and the disclaimer that follows 
017:         *    these conditions in the documentation and/or other materials 
018:         *    provided with the distribution.
019:         *
020:         * 3. The name "XFlow" must not be used to endorse or promote products
021:         *    derived from this software without prior written permission.  For
022:         *    written permission, please contact rcktan@yahoo.com
023:         * 
024:         * 4. Products derived from this software may not be called "XFlow", nor
025:         *    may "XFlow" appear in their name, without prior written permission
026:         *    from the XFlow Project Management (rcktan@yahoo.com)
027:         * 
028:         * In addition, we request (but do not require) that you include in the 
029:         * end-user documentation provided with the redistribution and/or in the 
030:         * software itself an acknowledgement equivalent to the following:
031:         *     "This product includes software developed by the
032:         *      XFlow Project (http://xflow.sourceforge.net/)."
033:         * Alternatively, the acknowledgment may be graphical using the logos 
034:         * available at http://xflow.sourceforge.net/
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL THE XFLOW AUTHORS OR THE PROJECT
040:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         *
049:         * ====================================================================
050:         * This software consists of voluntary contributions made by many 
051:         * individuals on behalf of the XFlow Project and was originally 
052:         * created by Rob Tan (rcktan@yahoo.com)
053:         * For more information on the XFlow Project, please see:
054:         *           <http://xflow.sourceforge.net/>.
055:         * ====================================================================
056:         */
057:        package xflow.util;
058:
059:        import java.io.*;
060:        import java.util.*;
061:
062:        public class HexUtil {
063:
064:            /**
065:             * <p>The nibbles' hexadecimal values. A nibble is a half byte.</p>
066:             */
067:            protected static final byte hexval[] = { (byte) '0', (byte) '1',
068:                    (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6',
069:                    (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B',
070:                    (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F' };
071:
072:            /**
073:             * <p>Converts a string into its hexadecimal notation.</p>
074:             *
075:             * <p><strong>FIXME:</strong> If this method is called frequently,
076:             * it should directly implement the algorithm in the called method
077:             * in order to avoid creating a string instance.</p>
078:             */
079:            public static String hexEncode(final String s) {
080:                return hexEncode(s.getBytes());
081:            }
082:
083:            /**
084:             * <p>Converts a byte array into its hexadecimal notation.</p>
085:             */
086:            public static String hexEncode(final byte[] s) {
087:                return hexEncode(s, 0, s.length);
088:            }
089:
090:            /**
091:             * <p>Converts a part of a byte array into its hexadecimal
092:             * notation.</p>
093:             */
094:            public static String hexEncode(final byte[] s, final int offset,
095:                    final int length) {
096:                StringBuffer b = new StringBuffer(length * 2);
097:                for (int i = offset; i < offset + length; i++) {
098:                    int c = s[i];
099:                    b.append((char) hexval[(c & 0xF0) >> 4]);
100:                    b.append((char) hexval[(c & 0x0F) >> 0]);
101:                }
102:                return b.toString();
103:            }
104:
105:            /**
106:             * <p>Converts a single byte into its hexadecimal notation.</p>
107:             */
108:            public static String hexEncode(final byte b) {
109:                StringBuffer sb = new StringBuffer(2);
110:                sb.append((char) hexval[(b & 0xF0) >> 4]);
111:                sb.append((char) hexval[(b & 0x0F) >> 0]);
112:                return sb.toString();
113:            }
114:
115:            /**
116:             * <p>Converts a short value (16-bit) into its hexadecimal
117:             * notation.</p>
118:             */
119:            public static String hexEncode(final short s) {
120:                StringBuffer sb = new StringBuffer(4);
121:                sb.append((char) hexval[(s & 0xF000) >> 12]);
122:                sb.append((char) hexval[(s & 0x0F00) >> 8]);
123:                sb.append((char) hexval[(s & 0x00F0) >> 4]);
124:                sb.append((char) hexval[(s & 0x000F) >> 0]);
125:                return sb.toString();
126:            }
127:
128:            /**
129:             * <p>Converts an int value (32-bit) into its hexadecimal
130:             * notation.</p>
131:             */
132:            public static String hexEncode(final int i) {
133:                StringBuffer sb = new StringBuffer(8);
134:                sb.append((char) hexval[(i & 0xF0000000) >> 28]);
135:                sb.append((char) hexval[(i & 0x0F000000) >> 24]);
136:                sb.append((char) hexval[(i & 0x00F00000) >> 20]);
137:                sb.append((char) hexval[(i & 0x000F0000) >> 16]);
138:                sb.append((char) hexval[(i & 0x0000F000) >> 12]);
139:                sb.append((char) hexval[(i & 0x00000F00) >> 8]);
140:                sb.append((char) hexval[(i & 0x000000F0) >> 4]);
141:                sb.append((char) hexval[(i & 0x0000000F) >> 0]);
142:                return sb.toString();
143:            }
144:
145:            /**
146:             * <p>Converts a long value (64-bit) into its hexadecimal
147:             * notation.</p>
148:             */
149:            public static String hexEncode(final long l) {
150:                StringBuffer sb = new StringBuffer(16);
151:                sb.append(hexEncode((int) (l & 0xFFFFFFFF00000000L) >> 32));
152:                sb.append(hexEncode((int) (l & 0x00000000FFFFFFFFL) >> 0));
153:                return sb.toString();
154:            }
155:
156:            /**
157:             * <p>Decodes the hexadecimal representation of a sequence of
158:             * bytes into a byte array. Each character in the string
159:             * represents a nibble (half byte) and must be one of the
160:             * characters '0'-'9', 'A'-'F' or 'a'-'f'.</p>
161:             *
162:             * @param s The string to be decoded
163:             *
164:             * @return The bytes
165:             *
166:             * @throw IllegalArgumentException if the string does not contain
167:             * a valid representation of a byte sequence.
168:             */
169:            public static byte[] hexDecode(final String s) {
170:                final int length = s.length();
171:
172:                /* The string to be converted must have an even number of
173:                   characters. */
174:                if (length % 2 == 1)
175:                    throw new IllegalArgumentException("String has odd length "
176:                            + length);
177:                byte[] b = new byte[length / 2];
178:                char[] c = new char[length];
179:                s.toUpperCase().getChars(0, length, c, 0);
180:                for (int i = 0; i < length; i += 2)
181:                    b[i / 2] = (byte) (decodeNibble(c[i]) << 4 & 0xF0 | decodeNibble(c[i + 1]) & 0x0F);
182:                return b;
183:            }
184:
185:            /**
186:             * <p>Decodes a nibble.</p>
187:             *
188:             * @param c A character in the range '0'-'9' or 'A'-'F'. Lower
189:             * case is not supported here.
190:             *
191:             * @return The decoded nibble in the range 0-15
192:             *
193:             * @throws IllegalArgumentException if <em>c</em> is not a
194:             * permitted character
195:             */
196:            protected static byte decodeNibble(final char c) {
197:                for (byte i = 0; i < hexval.length; i++)
198:                    if ((byte) c == hexval[i])
199:                        return i;
200:                throw new IllegalArgumentException("\"" + c + "\""
201:                        + " does not represent a nibble.");
202:            }
203:
204:            public static String hexEncodeObject(Object obj) {
205:
206:                String valueStr = null;
207:
208:                try {
209:                    byte[] barr = null;
210:                    ByteArrayOutputStream out = new ByteArrayOutputStream();
211:                    ObjectOutputStream s = new ObjectOutputStream(out);
212:                    s.writeObject(obj);
213:                    s.flush();
214:                    barr = out.toByteArray();
215:                    valueStr = hexEncode(barr);
216:                } catch (IOException ie) {
217:                    System.out.println(ie.getMessage());
218:                }
219:                return valueStr;
220:            }
221:
222:            public static Object hexDecodeObject(final String bytes) {
223:
224:                byte[] barr = hexDecode(bytes);
225:                Object obj = null;
226:                try {
227:                    ByteArrayInputStream in = new ByteArrayInputStream(barr);
228:                    ObjectInputStream sin = new ObjectInputStream(in);
229:                    obj = sin.readObject();
230:                } catch (Exception ie) {
231:                    System.out.println(ie.getMessage());
232:                }
233:                return obj;
234:            }
235:
236:            /**
237:             * <p>For testing.</p>
238:             */
239:            public static void main(final String args[]) throws IOException {
240:                final BufferedReader in = new BufferedReader(
241:                        new InputStreamReader(System.in));
242:                String s;
243:                do {
244:                    s = in.readLine();
245:                    if (s != null) {
246:                        String bytes = hexEncodeObject(s);
247:                        System.out.print("Hex encoded (object): ");
248:                        System.out.println(bytes);
249:                        System.out.print("Re-decoded (object):  ");
250:                        System.out.println(hexDecodeObject(bytes));
251:
252:                        /*
253:                        String bytes = hexEncode(s);
254:                        System.out.print("Hex encoded (String): ");
255:                        System.out.println(bytes);
256:                        System.out.print("Hex encoded (byte[]): ");
257:                        System.out.println(hexEncode(s.getBytes()));
258:                        System.out.print("Re-decoded (byte[]):  ");
259:                        System.out.println(new String(hexDecode(bytes)));
260:                         */
261:
262:                    }
263:                } while (s != null);
264:            }
265:
266:        }
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