001 /**
002 * =========================================
003 * LibFormula : a free Java formula library
004 * =========================================
005 *
006 * Project Info: http://reporting.pentaho.org/libformula/
007 *
008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 *
026 * ------------
027 * $Id: URLEncoder.java 3521 2007-10-16 10:55:14Z tmorgner $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031
032 package org.jfree.formula.util;
033
034 import java.io.UnsupportedEncodingException;
035
036 /**
037 * Creation-Date: Jan 22, 2007, 4:36:38 PM
038 *
039 * @author Thomas Morgner
040 */
041 public class URLEncoder
042 {
043 private URLEncoder()
044 {
045 }
046
047 private static final String[] hex = {
048 "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07",
049 "%08", "%09", "%0A", "%0B", "%0C", "%0D", "%0E", "%0F",
050 "%10", "%11", "%12", "%13", "%14", "%15", "%16", "%17",
051 "%18", "%19", "%1A", "%1B", "%1C", "%1D", "%1E", "%1F",
052 "%20", "%21", "%22", "%23", "%24", "%25", "%26", "%27",
053 "%28", "%29", "%2A", "%2B", "%2C", "%2D", "%2E", "%2F",
054 "%30", "%31", "%32", "%33", "%34", "%35", "%36", "%37",
055 "%38", "%39", "%3A", "%3B", "%3C", "%3D", "%3E", "%3F",
056 "%40", "%41", "%42", "%43", "%44", "%45", "%46", "%47",
057 "%48", "%49", "%4A", "%4B", "%4C", "%4D", "%4E", "%4F",
058 "%50", "%51", "%52", "%53", "%54", "%55", "%56", "%57",
059 "%58", "%59", "%5A", "%5B", "%5C", "%5D", "%5E", "%5F",
060 "%60", "%61", "%62", "%63", "%64", "%65", "%66", "%67",
061 "%68", "%69", "%6A", "%6B", "%6C", "%6D", "%6E", "%6F",
062 "%70", "%71", "%72", "%73", "%74", "%75", "%76", "%77",
063 "%78", "%79", "%7A", "%7B", "%7C", "%7D", "%7E", "%7F",
064 "%80", "%81", "%82", "%83", "%84", "%85", "%86", "%87",
065 "%88", "%89", "%8A", "%8B", "%8C", "%8D", "%8E", "%8F",
066 "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97",
067 "%98", "%99", "%9A", "%9B", "%9C", "%9D", "%9E", "%9F",
068 "%A0", "%A1", "%A2", "%A3", "%A4", "%A5", "%A6", "%A7",
069 "%A8", "%A9", "%AA", "%AB", "%AC", "%AD", "%AE", "%AF",
070 "%B0", "%B1", "%B2", "%B3", "%B4", "%B5", "%B6", "%B7",
071 "%B8", "%B9", "%BA", "%BB", "%BC", "%BD", "%BE", "%BF",
072 "%C0", "%C1", "%C2", "%C3", "%C4", "%C5", "%C6", "%C7",
073 "%C8", "%C9", "%CA", "%CB", "%CC", "%CD", "%CE", "%CF",
074 "%D0", "%D1", "%D2", "%D3", "%D4", "%D5", "%D6", "%D7",
075 "%D8", "%D9", "%DA", "%DB", "%DC", "%DD", "%DE", "%DF",
076 "%E0", "%E1", "%E2", "%E3", "%E4", "%E5", "%E6", "%E7",
077 "%E8", "%E9", "%EA", "%EB", "%EC", "%ED", "%EE", "%EF",
078 "%F0", "%F1", "%F2", "%F3", "%F4", "%F5", "%F6", "%F7",
079 "%F8", "%F9", "%FA", "%FB", "%FC", "%FD", "%FE", "%FF"
080 };
081
082 /**
083 * Encode a string according to RFC 1738.
084 * <p/>
085 * <quote> "...Only alphanumerics [0-9a-zA-Z], the special characters "$-_.+!*'()," [not
086 * including the quotes - ed], and reserved characters used for their reserved purposes
087 * may be used unencoded within a URL."</quote>
088 * <p/>
089 * <ul> <li><p>The ASCII characters 'a' through 'z', 'A' through 'Z', and '0' through
090 * '9' remain the same.
091 * <p/>
092 * <li><p>The unreserved characters - _ . ! ~ * ' ( ) remain the same.
093 * <p/>
094 * <li><p>All other ASCII characters are converted into the 3-character string "%xy",
095 * where xy is the two-digit hexadecimal representation of the character code
096 * <p/>
097 * <li><p>All non-ASCII characters are encoded in two steps: first to a sequence of 2 or
098 * 3 bytes, using the UTF-8 algorithm; secondly each of these bytes is encoded as "%xx".
099 * </ul>
100 *
101 * @param s The string to be encoded
102 * @return The encoded string
103 */
104 public static String encodeUTF8 (final String s)
105 {
106 final StringBuffer sbuf = new StringBuffer();
107 final char[] sChars = s.toCharArray();
108 final int len = sChars.length;
109 for (int i = 0; i < len; i++)
110 {
111 final int ch = sChars[i];
112 if ('A' <= ch && ch <= 'Z')
113 { // 'A'..'Z'
114 sbuf.append((char) ch);
115 }
116 else if ('a' <= ch && ch <= 'z')
117 { // 'a'..'z'
118 sbuf.append((char) ch);
119 }
120 else if ('0' <= ch && ch <= '9')
121 { // '0'..'9'
122 sbuf.append((char) ch);
123 }
124 else if (ch == '-' || ch == '_' // unreserved
125 || ch == '.' || ch == '!'
126 || ch == '~' || ch == '*'
127 || ch == '\'' || ch == '('
128 || ch == ')')
129 {
130 sbuf.append((char) ch);
131 }
132 else if (ch <= 0x007f)
133 { // other ASCII
134 sbuf.append(hex[ch]);
135 }
136 else if (ch <= 0x07FF)
137 { // non-ASCII <= 0x7FF
138 sbuf.append(hex[0xc0 | (ch >> 6)]);
139 sbuf.append(hex[0x80 | (ch & 0x3F)]);
140 }
141 else
142 { // 0x7FF < ch <= 0xFFFF
143 sbuf.append(hex[0xe0 | (ch >> 12)]);
144 sbuf.append(hex[0x80 | ((ch >> 6) & 0x3F)]);
145 sbuf.append(hex[0x80 | (ch & 0x3F)]);
146 }
147 }
148 return sbuf.toString();
149 }
150
151 private static String encodeBytes (final byte[] s)
152 {
153 final StringBuffer sbuf = new StringBuffer();
154 final int len = s.length;
155 for (int i = 0; i < len; i++)
156 {
157 final int ch = (s[i] & 0xff);
158 if ('A' <= ch && ch <= 'Z')
159 { // 'A'..'Z'
160 sbuf.append((char) ch);
161 }
162 else if ('a' <= ch && ch <= 'z')
163 { // 'a'..'z'
164 sbuf.append((char) ch);
165 }
166 else if ('0' <= ch && ch <= '9')
167 { // '0'..'9'
168 sbuf.append((char) ch);
169 }
170 else if (ch == '-' || ch == '_' // unreserved
171 || ch == '.' || ch == '!'
172 || ch == '~' || ch == '*'
173 || ch == '\'' || ch == '('
174 || ch == ')')
175 {
176 sbuf.append((char) ch);
177 }
178 else
179 { // other ASCII
180 sbuf.append(hex[ch]);
181 }
182 }
183 return sbuf.toString();
184 }
185
186 public static String encode (final String s, final String encoding)
187 throws UnsupportedEncodingException
188 {
189 if ("utf-8".equalsIgnoreCase(encoding))
190 {
191 return encodeUTF8(s);
192 }
193
194 return encodeBytes(s.getBytes(encoding));
195 }
196
197 }