Source Code Cross Referenced for Base64.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » tomcat » util » buf » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.tomcat.util.buf 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package org.apache.tomcat.util.buf;
019:
020:        /**
021:         * This class provides encode/decode for RFC 2045 Base64 as
022:         * defined by RFC 2045, N. Freed and N. Borenstein.
023:         * RFC 2045: Multipurpose Internet Mail Extensions (MIME)
024:         * Part One: Format of Internet Message Bodies. Reference
025:         * 1996 Available at: http://www.ietf.org/rfc/rfc2045.txt
026:         * This class is used by XML Schema binary format validation
027:         *
028:         * @author Jeffrey Rodriguez
029:         * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
030:         */
031:
032:        public final class Base64 {
033:
034:            private static org.apache.juli.logging.Log log = org.apache.juli.logging.LogFactory
035:                    .getLog(Base64.class);
036:
037:            static private final int BASELENGTH = 255;
038:            static private final int LOOKUPLENGTH = 63;
039:            static private final int TWENTYFOURBITGROUP = 24;
040:            static private final int EIGHTBIT = 8;
041:            static private final int SIXTEENBIT = 16;
042:            static private final int SIXBIT = 6;
043:            static private final int FOURBYTE = 4;
044:
045:            static private final byte PAD = (byte) '=';
046:            static private byte[] base64Alphabet = new byte[BASELENGTH];
047:            static private byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
048:
049:            static {
050:
051:                for (int i = 0; i < BASELENGTH; i++) {
052:                    base64Alphabet[i] = -1;
053:                }
054:                for (int i = 'Z'; i >= 'A'; i--) {
055:                    base64Alphabet[i] = (byte) (i - 'A');
056:                }
057:                for (int i = 'z'; i >= 'a'; i--) {
058:                    base64Alphabet[i] = (byte) (i - 'a' + 26);
059:                }
060:
061:                for (int i = '9'; i >= '0'; i--) {
062:                    base64Alphabet[i] = (byte) (i - '0' + 52);
063:                }
064:
065:                base64Alphabet['+'] = 62;
066:                base64Alphabet['/'] = 63;
067:
068:                for (int i = 0; i <= 25; i++)
069:                    lookUpBase64Alphabet[i] = (byte) ('A' + i);
070:
071:                for (int i = 26, j = 0; i <= 51; i++, j++)
072:                    lookUpBase64Alphabet[i] = (byte) ('a' + j);
073:
074:                for (int i = 52, j = 0; i <= 61; i++, j++)
075:                    lookUpBase64Alphabet[i] = (byte) ('0' + j);
076:
077:            }
078:
079:            static boolean isBase64(byte octect) {
080:                //shall we ignore white space? JEFF??
081:                return (octect == PAD || base64Alphabet[octect] != -1);
082:            }
083:
084:            static boolean isArrayByteBase64(byte[] arrayOctect) {
085:                int length = arrayOctect.length;
086:                if (length == 0)
087:                    return false;
088:                for (int i = 0; i < length; i++) {
089:                    if (Base64.isBase64(arrayOctect[i]) == false)
090:                        return false;
091:                }
092:                return true;
093:            }
094:
095:            /**
096:             * Encodes hex octects into Base64
097:             *
098:             * @param binaryData Array containing binaryData
099:             * @return Encoded Base64 array
100:             */
101:            public static byte[] encode(byte[] binaryData) {
102:                int lengthDataBits = binaryData.length * EIGHTBIT;
103:                int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
104:                int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
105:                byte encodedData[] = null;
106:
107:                if (fewerThan24bits != 0) //data not divisible by 24 bit
108:                    encodedData = new byte[(numberTriplets + 1) * 4];
109:                else
110:                    // 16 or 8 bit
111:                    encodedData = new byte[numberTriplets * 4];
112:
113:                byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
114:
115:                int encodedIndex = 0;
116:                int dataIndex = 0;
117:                int i = 0;
118:                for (i = 0; i < numberTriplets; i++) {
119:
120:                    dataIndex = i * 3;
121:                    b1 = binaryData[dataIndex];
122:                    b2 = binaryData[dataIndex + 1];
123:                    b3 = binaryData[dataIndex + 2];
124:
125:                    l = (byte) (b2 & 0x0f);
126:                    k = (byte) (b1 & 0x03);
127:
128:                    encodedIndex = i * 4;
129:                    encodedData[encodedIndex] = lookUpBase64Alphabet[b1 >> 2];
130:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[(b2 >> 4)
131:                            | (k << 4)];
132:                    encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2)
133:                            | (b3 >> 6)];
134:                    encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
135:                }
136:
137:                // form integral number of 6-bit groups
138:                dataIndex = i * 3;
139:                encodedIndex = i * 4;
140:                if (fewerThan24bits == EIGHTBIT) {
141:                    b1 = binaryData[dataIndex];
142:                    k = (byte) (b1 & 0x03);
143:                    encodedData[encodedIndex] = lookUpBase64Alphabet[b1 >> 2];
144:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
145:                    encodedData[encodedIndex + 2] = PAD;
146:                    encodedData[encodedIndex + 3] = PAD;
147:                } else if (fewerThan24bits == SIXTEENBIT) {
148:
149:                    b1 = binaryData[dataIndex];
150:                    b2 = binaryData[dataIndex + 1];
151:                    l = (byte) (b2 & 0x0f);
152:                    k = (byte) (b1 & 0x03);
153:                    encodedData[encodedIndex] = lookUpBase64Alphabet[b1 >> 2];
154:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[(b2 >> 4)
155:                            | (k << 4)];
156:                    encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
157:                    encodedData[encodedIndex + 3] = PAD;
158:                }
159:                return encodedData;
160:            }
161:
162:            /**
163:             * Decodes Base64 data into octects
164:             *
165:             * @param base64Data Byte array containing Base64 data
166:             * @return Array containind decoded data.
167:             */
168:            public byte[] decode(byte[] base64Data) {
169:                int numberQuadruple = base64Data.length / FOURBYTE;
170:                byte decodedData[] = null;
171:                byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;
172:
173:                // Throw away anything not in base64Data
174:                // Adjust size
175:
176:                int encodedIndex = 0;
177:                int dataIndex = 0;
178:                decodedData = new byte[numberQuadruple * 3 + 1];
179:
180:                for (int i = 0; i < numberQuadruple; i++) {
181:                    dataIndex = i * 4;
182:                    marker0 = base64Data[dataIndex + 2];
183:                    marker1 = base64Data[dataIndex + 3];
184:
185:                    b1 = base64Alphabet[base64Data[dataIndex]];
186:                    b2 = base64Alphabet[base64Data[dataIndex + 1]];
187:
188:                    if (marker0 != PAD && marker1 != PAD) { //No PAD e.g 3cQl
189:                        b3 = base64Alphabet[marker0];
190:                        b4 = base64Alphabet[marker1];
191:
192:                        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
193:                        decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
194:                        decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);
195:                    } else if (marker0 == PAD) { //Two PAD e.g. 3c[Pad][Pad]
196:                        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
197:                        decodedData[encodedIndex + 1] = (byte) ((b2 & 0xf) << 4);
198:                        decodedData[encodedIndex + 2] = (byte) 0;
199:                    } else if (marker1 == PAD) { //One PAD e.g. 3cQ[Pad]
200:                        b3 = base64Alphabet[marker0];
201:
202:                        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
203:                        decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
204:                        decodedData[encodedIndex + 2] = (byte) (b3 << 6);
205:                    }
206:                    encodedIndex += 3;
207:                }
208:                return decodedData;
209:
210:            }
211:
212:            static final int base64[] = { 64, 64, 64, 64, 64, 64, 64, 64, 64,
213:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
214:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
215:                    64, 64, 64, 64, 62, 64, 64, 64, 63, 52, 53, 54, 55, 56, 57,
216:                    58, 59, 60, 61, 64, 64, 64, 64, 64, 64, 64, 0, 1, 2, 3, 4,
217:                    5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
218:                    21, 22, 23, 24, 25, 64, 64, 64, 64, 64, 64, 26, 27, 28, 29,
219:                    30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
220:                    45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64, 64, 64, 64,
221:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
222:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
223:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
224:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
225:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
226:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
227:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
228:                    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
229:                    64, 64, 64, 64, 64 };
230:
231:            public static String base64Decode(String orig) {
232:                char chars[] = orig.toCharArray();
233:                StringBuffer sb = new StringBuffer();
234:                int i = 0;
235:
236:                int shift = 0; // # of excess bits stored in accum
237:                int acc = 0;
238:
239:                for (i = 0; i < chars.length; i++) {
240:                    int v = base64[chars[i] & 0xFF];
241:
242:                    if (v >= 64) {
243:                        if (chars[i] != '=')
244:                            if (log.isDebugEnabled())
245:                                log.debug("Wrong char in base64: " + chars[i]);
246:                    } else {
247:                        acc = (acc << 6) | v;
248:                        shift += 6;
249:                        if (shift >= 8) {
250:                            shift -= 8;
251:                            sb.append((char) ((acc >> shift) & 0xff));
252:                        }
253:                    }
254:                }
255:                return sb.toString();
256:            }
257:
258:        }
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