Source Code Cross Referenced for Base64.java in  » XML » xerces-2_9_1 » org » apache » xerces » impl » dv » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xerces 2_9_1 » org.apache.xerces.impl.dv.util 
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.xerces.impl.dv.util;
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:         * This implementation does not encode/decode streaming
029:         * data. You need the data that you will encode/decode
030:         * already on a byte arrray.
031:         *
032:         * @xerces.internal 
033:         *
034:         * @author Jeffrey Rodriguez
035:         * @author Sandy Gao
036:         * @version $Id: Base64.java 446747 2006-09-15 21:46:20Z mrglavas $
037:         */
038:        public final class Base64 {
039:
040:            static private final int BASELENGTH = 128;
041:            static private final int LOOKUPLENGTH = 64;
042:            static private final int TWENTYFOURBITGROUP = 24;
043:            static private final int EIGHTBIT = 8;
044:            static private final int SIXTEENBIT = 16;
045:            static private final int SIXBIT = 6;
046:            static private final int FOURBYTE = 4;
047:            static private final int SIGN = -128;
048:            static private final char PAD = '=';
049:            static private final boolean fDebug = false;
050:            static final private byte[] base64Alphabet = new byte[BASELENGTH];
051:            static final private char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH];
052:
053:            static {
054:
055:                for (int i = 0; i < BASELENGTH; ++i) {
056:                    base64Alphabet[i] = -1;
057:                }
058:                for (int i = 'Z'; i >= 'A'; i--) {
059:                    base64Alphabet[i] = (byte) (i - 'A');
060:                }
061:                for (int i = 'z'; i >= 'a'; i--) {
062:                    base64Alphabet[i] = (byte) (i - 'a' + 26);
063:                }
064:
065:                for (int i = '9'; i >= '0'; i--) {
066:                    base64Alphabet[i] = (byte) (i - '0' + 52);
067:                }
068:
069:                base64Alphabet['+'] = 62;
070:                base64Alphabet['/'] = 63;
071:
072:                for (int i = 0; i <= 25; i++)
073:                    lookUpBase64Alphabet[i] = (char) ('A' + i);
074:
075:                for (int i = 26, j = 0; i <= 51; i++, j++)
076:                    lookUpBase64Alphabet[i] = (char) ('a' + j);
077:
078:                for (int i = 52, j = 0; i <= 61; i++, j++)
079:                    lookUpBase64Alphabet[i] = (char) ('0' + j);
080:                lookUpBase64Alphabet[62] = (char) '+';
081:                lookUpBase64Alphabet[63] = (char) '/';
082:
083:            }
084:
085:            protected static boolean isWhiteSpace(char octect) {
086:                return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
087:            }
088:
089:            protected static boolean isPad(char octect) {
090:                return (octect == PAD);
091:            }
092:
093:            protected static boolean isData(char octect) {
094:                return (octect < BASELENGTH && base64Alphabet[octect] != -1);
095:            }
096:
097:            protected static boolean isBase64(char octect) {
098:                return (isWhiteSpace(octect) || isPad(octect) || isData(octect));
099:            }
100:
101:            /**
102:             * Encodes hex octects into Base64
103:             *
104:             * @param binaryData Array containing binaryData
105:             * @return Encoded Base64 array
106:             */
107:            public static String encode(byte[] binaryData) {
108:
109:                if (binaryData == null)
110:                    return null;
111:
112:                int lengthDataBits = binaryData.length * EIGHTBIT;
113:                if (lengthDataBits == 0) {
114:                    return "";
115:                }
116:
117:                int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
118:                int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
119:                int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1
120:                        : numberTriplets;
121:                char encodedData[] = null;
122:
123:                encodedData = new char[numberQuartet * 4];
124:
125:                byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
126:
127:                int encodedIndex = 0;
128:                int dataIndex = 0;
129:                if (fDebug) {
130:                    System.out
131:                            .println("number of triplets = " + numberTriplets);
132:                }
133:
134:                for (int i = 0; i < numberTriplets; i++) {
135:                    b1 = binaryData[dataIndex++];
136:                    b2 = binaryData[dataIndex++];
137:                    b3 = binaryData[dataIndex++];
138:
139:                    if (fDebug) {
140:                        System.out.println("b1= " + b1 + ", b2= " + b2
141:                                + ", b3= " + b3);
142:                    }
143:
144:                    l = (byte) (b2 & 0x0f);
145:                    k = (byte) (b1 & 0x03);
146:
147:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
148:                            : (byte) ((b1) >> 2 ^ 0xc0);
149:
150:                    byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4)
151:                            : (byte) ((b2) >> 4 ^ 0xf0);
152:                    byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6)
153:                            : (byte) ((b3) >> 6 ^ 0xfc);
154:
155:                    if (fDebug) {
156:                        System.out.println("val2 = " + val2);
157:                        System.out.println("k4   = " + (k << 4));
158:                        System.out.println("vak  = " + (val2 | (k << 4)));
159:                    }
160:
161:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
162:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[val2
163:                            | (k << 4)];
164:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2)
165:                            | val3];
166:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
167:                }
168:
169:                // form integral number of 6-bit groups
170:                if (fewerThan24bits == EIGHTBIT) {
171:                    b1 = binaryData[dataIndex];
172:                    k = (byte) (b1 & 0x03);
173:                    if (fDebug) {
174:                        System.out.println("b1=" + b1);
175:                        System.out.println("b1<<2 = " + (b1 >> 2));
176:                    }
177:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
178:                            : (byte) ((b1) >> 2 ^ 0xc0);
179:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
180:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
181:                    encodedData[encodedIndex++] = PAD;
182:                    encodedData[encodedIndex++] = PAD;
183:                } else if (fewerThan24bits == SIXTEENBIT) {
184:                    b1 = binaryData[dataIndex];
185:                    b2 = binaryData[dataIndex + 1];
186:                    l = (byte) (b2 & 0x0f);
187:                    k = (byte) (b1 & 0x03);
188:
189:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
190:                            : (byte) ((b1) >> 2 ^ 0xc0);
191:                    byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4)
192:                            : (byte) ((b2) >> 4 ^ 0xf0);
193:
194:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
195:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[val2
196:                            | (k << 4)];
197:                    encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
198:                    encodedData[encodedIndex++] = PAD;
199:                }
200:
201:                return new String(encodedData);
202:            }
203:
204:            /**
205:             * Decodes Base64 data into octects
206:             *
207:             * @param encoded string containing Base64 data
208:             * @return Array containind decoded data.
209:             */
210:            public static byte[] decode(String encoded) {
211:
212:                if (encoded == null)
213:                    return null;
214:
215:                char[] base64Data = encoded.toCharArray();
216:                // remove white spaces
217:                int len = removeWhiteSpace(base64Data);
218:
219:                if (len % FOURBYTE != 0) {
220:                    return null;//should be divisible by four
221:                }
222:
223:                int numberQuadruple = (len / FOURBYTE);
224:
225:                if (numberQuadruple == 0)
226:                    return new byte[0];
227:
228:                byte decodedData[] = null;
229:                byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
230:                char d1 = 0, d2 = 0, d3 = 0, d4 = 0;
231:
232:                int i = 0;
233:                int encodedIndex = 0;
234:                int dataIndex = 0;
235:                decodedData = new byte[(numberQuadruple) * 3];
236:
237:                for (; i < numberQuadruple - 1; i++) {
238:
239:                    if (!isData((d1 = base64Data[dataIndex++]))
240:                            || !isData((d2 = base64Data[dataIndex++]))
241:                            || !isData((d3 = base64Data[dataIndex++]))
242:                            || !isData((d4 = base64Data[dataIndex++])))
243:                        return null;//if found "no data" just return null
244:
245:                    b1 = base64Alphabet[d1];
246:                    b2 = base64Alphabet[d2];
247:                    b3 = base64Alphabet[d3];
248:                    b4 = base64Alphabet[d4];
249:
250:                    decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
251:                    decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
252:                    decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
253:                }
254:
255:                if (!isData((d1 = base64Data[dataIndex++]))
256:                        || !isData((d2 = base64Data[dataIndex++]))) {
257:                    return null;//if found "no data" just return null
258:                }
259:
260:                b1 = base64Alphabet[d1];
261:                b2 = base64Alphabet[d2];
262:
263:                d3 = base64Data[dataIndex++];
264:                d4 = base64Data[dataIndex++];
265:                if (!isData((d3)) || !isData((d4))) {//Check if they are PAD characters
266:                    if (isPad(d3) && isPad(d4)) { //Two PAD e.g. 3c[Pad][Pad]
267:                        if ((b2 & 0xf) != 0)//last 4 bits should be zero
268:                            return null;
269:                        byte[] tmp = new byte[i * 3 + 1];
270:                        System.arraycopy(decodedData, 0, tmp, 0, i * 3);
271:                        tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
272:                        return tmp;
273:                    } else if (!isPad(d3) && isPad(d4)) { //One PAD  e.g. 3cQ[Pad]
274:                        b3 = base64Alphabet[d3];
275:                        if ((b3 & 0x3) != 0)//last 2 bits should be zero
276:                            return null;
277:                        byte[] tmp = new byte[i * 3 + 2];
278:                        System.arraycopy(decodedData, 0, tmp, 0, i * 3);
279:                        tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
280:                        tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
281:                        return tmp;
282:                    } else {
283:                        return null;//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
284:                    }
285:                } else { //No PAD e.g 3cQl
286:                    b3 = base64Alphabet[d3];
287:                    b4 = base64Alphabet[d4];
288:                    decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
289:                    decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
290:                    decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
291:
292:                }
293:
294:                return decodedData;
295:            }
296:
297:            /**
298:             * remove WhiteSpace from MIME containing encoded Base64 data.
299:             * 
300:             * @param data  the byte array of base64 data (with WS)
301:             * @return      the new length
302:             */
303:            protected static int removeWhiteSpace(char[] data) {
304:                if (data == null)
305:                    return 0;
306:
307:                // count characters that's not whitespace
308:                int newSize = 0;
309:                int len = data.length;
310:                for (int i = 0; i < len; i++) {
311:                    if (!isWhiteSpace(data[i]))
312:                        data[newSize++] = data[i];
313:                }
314:                return newSize;
315:            }
316:        }
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