Source Code Cross Referenced for Base64.java in  » Portal » stringbeans-3.5 » com » nabhinc » util » md » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » stringbeans 3.5 » com.nabhinc.util.md 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Modified by Nabh Information Systems, Inc.
003:         * Modifications (c) 2006 Nabh Information Systems, Inc.
004:         *
005:         * Copyright 1999,2004 The Apache Software Foundation.
006:         * 
007:         * Licensed under the Apache License, Version 2.0 (the "License");
008:         * you may not use this file except in compliance with the License.
009:         * You may obtain a copy of the License at
010:         * 
011:         *      http://www.apache.org/licenses/LICENSE-2.0
012:         * 
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License.
018:         */
019:        package com.nabhinc.util.md;
020:
021:        /**
022:         * This class provides encode/decode for RFC 2045 Base64 as defined by
023:         * RFC 2045, N. Freed and N. Borenstein.  <a
024:         * href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>:
025:         * Multipurpose Internet Mail Extensions (MIME) Part One: Format of
026:         * Internet Message Bodies. Reference 1996
027:         *
028:         * @author Jeffrey Rodriguez
029:         * @version $Id: Base64.java,v 1.2 2006/08/04 17:34:50 wchokry Exp $
030:         */
031:        public final class Base64 {
032:            static private final int BASELENGTH = 255;
033:            static private final int LOOKUPLENGTH = 64;
034:            static private final int TWENTYFOURBITGROUP = 24;
035:            static private final int EIGHTBIT = 8;
036:            static private final int SIXTEENBIT = 16;
037:            static private final int SIXBIT = 6;
038:            static private final int FOURBYTE = 4;
039:            static private final int SIGN = -128;
040:            static private final byte PAD = (byte) '=';
041:            static private byte[] base64Alphabet = new byte[BASELENGTH];
042:            static private byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
043:            //static private final Log log = LogSource.getInstance("org.apache.commons.util.Base64");
044:
045:            static {
046:                for (int i = 0; i < BASELENGTH; i++) {
047:                    base64Alphabet[i] = -1;
048:                }
049:                for (int i = 'Z'; i >= 'A'; i--) {
050:                    base64Alphabet[i] = (byte) (i - 'A');
051:                }
052:                for (int i = 'z'; i >= 'a'; i--) {
053:                    base64Alphabet[i] = (byte) (i - 'a' + 26);
054:                }
055:                for (int i = '9'; i >= '0'; i--) {
056:                    base64Alphabet[i] = (byte) (i - '0' + 52);
057:                }
058:
059:                base64Alphabet['+'] = 62;
060:                base64Alphabet['/'] = 63;
061:
062:                for (int i = 0; i <= 25; i++)
063:                    lookUpBase64Alphabet[i] = (byte) ('A' + i);
064:
065:                for (int i = 26, j = 0; i <= 51; i++, j++)
066:                    lookUpBase64Alphabet[i] = (byte) ('a' + j);
067:
068:                for (int i = 52, j = 0; i <= 61; i++, j++)
069:                    lookUpBase64Alphabet[i] = (byte) ('0' + j);
070:
071:                lookUpBase64Alphabet[62] = (byte) '+';
072:                lookUpBase64Alphabet[63] = (byte) '/';
073:            }
074:
075:            public static boolean isBase64(String isValidString) {
076:                return isArrayByteBase64(isValidString.getBytes());
077:            }
078:
079:            public static boolean isBase64(byte octect) {
080:                //shall we ignore white space? JEFF??
081:                return (octect == PAD || base64Alphabet[octect] != -1);
082:            }
083:
084:            public static boolean isArrayByteBase64(byte[] arrayOctect) {
085:                int length = arrayOctect.length;
086:                if (length == 0) {
087:                    // shouldn't a 0 length array be valid base64 data?
088:                    // return false;
089:                    return true;
090:                }
091:                for (int i = 0; i < length; i++) {
092:                    if (!Base64.isBase64(arrayOctect[i]))
093:                        return false;
094:                }
095:                return true;
096:            }
097:
098:            /**
099:             * Encodes hex octects into Base64.
100:             *
101:             * @param binaryData Array containing binary data to encode.
102:             * @return Base64-encoded data.
103:             */
104:            public static byte[] encode(byte[] binaryData) {
105:                int lengthDataBits = binaryData.length * EIGHTBIT;
106:                int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
107:                int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
108:                byte encodedData[] = null;
109:
110:                if (fewerThan24bits != 0) {
111:                    //data not divisible by 24 bit
112:                    encodedData = new byte[(numberTriplets + 1) * 4];
113:                } else {
114:                    // 16 or 8 bit
115:                    encodedData = new byte[numberTriplets * 4];
116:                }
117:
118:                byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
119:
120:                int encodedIndex = 0;
121:                int dataIndex = 0;
122:                int i = 0;
123:                //log.debug("number of triplets = " + numberTriplets);
124:                for (i = 0; i < numberTriplets; i++) {
125:                    dataIndex = i * 3;
126:                    b1 = binaryData[dataIndex];
127:                    b2 = binaryData[dataIndex + 1];
128:                    b3 = binaryData[dataIndex + 2];
129:
130:                    //log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);
131:
132:                    l = (byte) (b2 & 0x0f);
133:                    k = (byte) (b1 & 0x03);
134:
135:                    encodedIndex = i * 4;
136:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
137:                            : (byte) ((b1) >> 2 ^ 0xc0);
138:                    byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4)
139:                            : (byte) ((b2) >> 4 ^ 0xf0);
140:                    byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6)
141:                            : (byte) ((b3) >> 6 ^ 0xfc);
142:
143:                    encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
144:                    //log.debug( "val2 = " + val2 );
145:                    //log.debug( "k4   = " + (k<<4) );
146:                    //log.debug(  "vak  = " + (val2 | (k<<4)) );
147:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2
148:                            | (k << 4)];
149:                    encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2)
150:                            | val3];
151:                    encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
152:                }
153:
154:                // form integral number of 6-bit groups
155:                dataIndex = i * 3;
156:                encodedIndex = i * 4;
157:                if (fewerThan24bits == EIGHTBIT) {
158:                    b1 = binaryData[dataIndex];
159:                    k = (byte) (b1 & 0x03);
160:                    //log.debug("b1=" + b1);
161:                    //log.debug("b1<<2 = " + (b1>>2) );
162:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
163:                            : (byte) ((b1) >> 2 ^ 0xc0);
164:                    encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
165:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
166:                    encodedData[encodedIndex + 2] = PAD;
167:                    encodedData[encodedIndex + 3] = PAD;
168:                } else if (fewerThan24bits == SIXTEENBIT) {
169:
170:                    b1 = binaryData[dataIndex];
171:                    b2 = binaryData[dataIndex + 1];
172:                    l = (byte) (b2 & 0x0f);
173:                    k = (byte) (b1 & 0x03);
174:
175:                    byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
176:                            : (byte) ((b1) >> 2 ^ 0xc0);
177:                    byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4)
178:                            : (byte) ((b2) >> 4 ^ 0xf0);
179:
180:                    encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
181:                    encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2
182:                            | (k << 4)];
183:                    encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
184:                    encodedData[encodedIndex + 3] = PAD;
185:                }
186:
187:                return encodedData;
188:            }
189:
190:            /**
191:             * Decodes Base64 data into octects
192:             *
193:             * @param base64DataBC Byte array containing Base64 data
194:             * @param decodedDataCC The decoded data chars
195:             */
196:            public static void decode(ByteChunk base64DataBC,
197:                    CharChunk decodedDataCC) {
198:                int start = base64DataBC.getStart();
199:                int end = base64DataBC.getEnd();
200:                byte[] base64Data = base64DataBC.getBuffer();
201:
202:                decodedDataCC.recycle();
203:
204:                // handle the edge case, so we don't have to worry about it later
205:                if (end - start == 0) {
206:                    return;
207:                }
208:
209:                int numberQuadruple = (end - start) / FOURBYTE;
210:                byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;
211:
212:                // Throw away anything not in base64Data
213:
214:                int encodedIndex = 0;
215:                int dataIndex = start;
216:                char[] decodedData = null;
217:
218:                {
219:                    // this sizes the output array properly - rlw
220:                    int lastData = end - start;
221:                    // ignore the '=' padding
222:                    while (base64Data[start + lastData - 1] == PAD) {
223:                        if (--lastData == 0) {
224:                            return;
225:                        }
226:                    }
227:                    decodedDataCC.allocate(lastData - numberQuadruple, -1);
228:                    decodedDataCC.setEnd(lastData - numberQuadruple);
229:                    decodedData = decodedDataCC.getBuffer();
230:                }
231:
232:                for (int i = 0; i < numberQuadruple; i++) {
233:                    dataIndex = start + i * 4;
234:                    marker0 = base64Data[dataIndex + 2];
235:                    marker1 = base64Data[dataIndex + 3];
236:
237:                    b1 = base64Alphabet[base64Data[dataIndex]];
238:                    b2 = base64Alphabet[base64Data[dataIndex + 1]];
239:
240:                    if (marker0 != PAD && marker1 != PAD) {
241:                        //No PAD e.g 3cQl
242:                        b3 = base64Alphabet[marker0];
243:                        b4 = base64Alphabet[marker1];
244:
245:                        decodedData[encodedIndex] = (char) ((b1 << 2 | b2 >> 4) & 0xff);
246:                        decodedData[encodedIndex + 1] = (char) ((((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)) & 0xff);
247:                        decodedData[encodedIndex + 2] = (char) ((b3 << 6 | b4) & 0xff);
248:                    } else if (marker0 == PAD) {
249:                        //Two PAD e.g. 3c[Pad][Pad]
250:                        decodedData[encodedIndex] = (char) ((b1 << 2 | b2 >> 4) & 0xff);
251:                    } else if (marker1 == PAD) {
252:                        //One PAD e.g. 3cQ[Pad]
253:                        b3 = base64Alphabet[marker0];
254:
255:                        decodedData[encodedIndex] = (char) ((b1 << 2 | b2 >> 4) & 0xff);
256:                        decodedData[encodedIndex + 1] = (char) ((((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)) & 0xff);
257:                    }
258:                    encodedIndex += 3;
259:                }
260:            }
261:
262:        }
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