001: /* Copyright (c) 1995-2000, The Hypersonic SQL Group.
002: * All rights reserved.
003: *
004: * Redistribution and use in source and binary forms, with or without
005: * modification, are permitted provided that the following conditions are met:
006: *
007: * Redistributions of source code must retain the above copyright notice, this
008: * list of conditions and the following disclaimer.
009: *
010: * Redistributions in binary form must reproduce the above copyright notice,
011: * this list of conditions and the following disclaimer in the documentation
012: * and/or other materials provided with the distribution.
013: *
014: * Neither the name of the Hypersonic SQL Group nor the names of its
015: * contributors may be used to endorse or promote products derived from this
016: * software without specific prior written permission.
017: *
018: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021: * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
022: * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029: *
030: * This software consists of voluntary contributions made by many individuals
031: * on behalf of the Hypersonic SQL Group.
032: *
033: *
034: * For work added by the HSQL Development Group:
035: *
036: * Copyright (c) 2001-2004, The HSQL Development Group
037: * All rights reserved.
038: *
039: * Redistribution and use in source and binary forms, with or without
040: * modification, are permitted provided that the following conditions are met:
041: *
042: * Redistributions of source code must retain the above copyright notice, this
043: * list of conditions and the following disclaimer.
044: *
045: * Redistributions in binary form must reproduce the above copyright notice,
046: * this list of conditions and the following disclaimer in the documentation
047: * and/or other materials provided with the distribution.
048: *
049: * Neither the name of the HSQL Development Group nor the names of its
050: * contributors may be used to endorse or promote products derived from this
051: * software without specific prior written permission.
052: *
053: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
054: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
055: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
056: * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
057: * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
060: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
061: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
062: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064: */
065:
066: package br.com.igor.db;
067:
068: import java.io.IOException;
069:
070: /**
071: * Collection of static methods for converting strings between different
072: * formats and to and from byte arrays
073: *
074: *
075: * @version 1.7.2
076: */
077:
078: // fredt@users 20020328 - patch 1.7.0 by fredt - error trapping
079: public class StringConverter {
080:
081: private static final byte HEXBYTES[] = { (byte) '0', (byte) '1',
082: (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6',
083: (byte) '7', (byte) '8', (byte) '9', (byte) 'a', (byte) 'b',
084: (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f' };
085: private static final String HEXINDEX = "0123456789abcdef0123456789ABCDEF";
086:
087: /**
088: * Compacts a hexadecimal string into a byte array
089: *
090: *
091: * @param s hexadecimal string
092: *
093: * @return byte array for the hex string
094: * @throws IOException
095: */
096: public static byte[] hexToByte(String s) throws IOException {
097:
098: int l = s.length() / 2;
099: byte data[] = new byte[l];
100: int j = 0;
101:
102: if (s.length() % 2 != 0) {
103: throw new IOException(
104: "hexadecimal string with odd number of characters");
105: }
106:
107: for (int i = 0; i < l; i++) {
108: char c = s.charAt(j++);
109: int n, b;
110:
111: n = HEXINDEX.indexOf(c);
112:
113: if (n == -1) {
114: throw new IOException(
115: "hexadecimal string contains non hex character");
116: }
117:
118: b = (n & 0xf) << 4;
119: c = s.charAt(j++);
120: n = HEXINDEX.indexOf(c);
121: b += (n & 0xf);
122: data[i] = (byte) b;
123: }
124:
125: return data;
126: }
127:
128: /**
129: * Converts a byte array into a hexadecimal string
130: *
131: *
132: * @param b byte array
133: *
134: * @return hex string
135: */
136: public static String byteToHex(byte b[]) {
137:
138: int len = b.length;
139: char[] s = new char[len * 2];
140:
141: for (int i = 0, j = 0; i < len; i++) {
142: int c = b[i] & 0xff;
143:
144: s[j++] = (char) HEXBYTES[c >> 4 & 0xf];
145: s[j++] = (char) HEXBYTES[c & 0xf];
146: }
147:
148: return new String(s);
149: }
150: }
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