001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: * [Additional notices, if required by prior licensing conditions]
055: *
056: */
057: package com.rimfaxe.webserver.servletapi.util;
058:
059: import java.io.ByteArrayOutputStream;
060: import java.io.IOException;
061: import java.io.OutputStreamWriter;
062: import java.util.BitSet;
063:
064: /**
065: *
066: * This class is very similar to the java.net.URLEncoder class.
067: *
068: * Unfortunately, with java.net.URLEncoder there is no way to specify to the
069: * java.net.URLEncoder which characters should NOT be encoded.
070: *
071: * This code was moved from DefaultServlet.java
072: *
073: * @author Craig R. McClanahan
074: * @author Remy Maucherat
075: */
076: public class URLEncoder {
077: protected static final char[] hexadecimal = { '0', '1', '2', '3',
078: '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
079:
080: //Array containing the safe characters set.
081: protected BitSet safeCharacters = new BitSet(256);
082:
083: public URLEncoder() {
084: for (char i = 'a'; i <= 'z'; i++) {
085: addSafeCharacter(i);
086: }
087: for (char i = 'A'; i <= 'Z'; i++) {
088: addSafeCharacter(i);
089: }
090: for (char i = '0'; i <= '9'; i++) {
091: addSafeCharacter(i);
092: }
093: }
094:
095: public void addSafeCharacter(char c) {
096: safeCharacters.set(c);
097: }
098:
099: public String encode(String path) {
100: int maxBytesPerChar = 10;
101: int caseDiff = ('a' - 'A');
102: StringBuffer rewrittenPath = new StringBuffer(path.length());
103: ByteArrayOutputStream buf = new ByteArrayOutputStream(
104: maxBytesPerChar);
105: OutputStreamWriter writer = null;
106: try {
107: writer = new OutputStreamWriter(buf, "UTF8");
108: } catch (Exception e) {
109:
110: writer = new OutputStreamWriter(buf);
111: }
112:
113: for (int i = 0; i < path.length(); i++) {
114: int c = (int) path.charAt(i);
115: if (safeCharacters.get(c)) {
116: rewrittenPath.append((char) c);
117: } else {
118: // convert to external encoding before hex conversion
119: try {
120: writer.write(c);
121: writer.flush();
122: } catch (IOException e) {
123: buf.reset();
124: continue;
125: }
126: byte[] ba = buf.toByteArray();
127: for (int j = 0; j < ba.length; j++) {
128: // Converting each byte in the buffer
129: byte toEncode = ba[j];
130: rewrittenPath.append('%');
131: int low = (int) (toEncode & 0x0f);
132: int high = (int) ((toEncode & 0xf0) >> 4);
133: rewrittenPath.append(hexadecimal[high]);
134: rewrittenPath.append(hexadecimal[low]);
135: }
136: buf.reset();
137: }
138: }
139: return rewrittenPath.toString();
140: }
141: }
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