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1
64
65 package com.jcorporate.expresso.core.misc;
66
67
68
74 public class CookieBase64 {
75 public CookieBase64() {
76 }
77
78 static final private int bytesPerLine = 80;
80
81 private final static char[] vec = {
82 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ',', '.' };
91 private final static byte padding = (byte) '=';
92
93
97 static private byte convertToNumber(byte inByte) {
98 if (inByte >= 'A' && inByte <= 'Z') {
99 return (byte) (inByte - 'A');
100 }
101 if (inByte >= 'a' && inByte <= 'z') {
102 return (byte) (inByte - 'a' + 26);
103 }
104 if (inByte >= '0' && inByte <= '9') {
105 return (byte) (inByte - '0' + 52);
106 }
107 if (inByte == ',') {
108 return (62);
109 }
110 if (inByte == '.') {
111 return (63);
112 }
113
114 return (-1);
115 }
116
117
125 static private byte[] decode(String  data)
126 throws IllegalArgumentException {
127
128 if (data == null) {
130 throw new IllegalArgumentException ("Base64.decode: data must not be null");
131 }
132 if (data.length() % 4 != 0) {
134 throw new IllegalArgumentException ("Base64.decode: data it not of proper length");
135 }
136
137 byte[] inputBuffer = data.getBytes();
138 int validInputCount = 0;
139 byte[] inBuffer = new byte[inputBuffer.length];
140 int dataLength = inputBuffer.length;
141
142 int i;
148
149 for (i = 0; i < dataLength; i++) {
150 byte temp = convertToNumber(inputBuffer[i]);
151
152 if (temp >= 0) {
153 inBuffer[i] = temp;
154 validInputCount++;
155 }
156 }
157
158 byte[] outBuffer = new byte[dataLength];
159 int startOut = 0;
160 int startIn = 0;
161
162 while (validInputCount > startIn) {
163 int dataLen = validInputCount;
164
165 if (dataLen - startIn > 3) {
166 outBuffer[startOut] = (byte) ((inBuffer[startIn] << 2) +
167 (inBuffer[startIn + 1] >>> 4));
168 outBuffer[startOut + 1] = (byte) ((inBuffer[startIn + 1] << 4) +
169 (inBuffer[startIn + 2] >>> 2));
170 outBuffer[startOut + 2] = (byte) ((inBuffer[startIn + 2] << 6) +
171 (inBuffer[startIn + 3]));
172 startOut += 3;
173 startIn += 4;
174 } else if (dataLen - startIn > 2) {
175 outBuffer[startOut] = (byte) ((inBuffer[startIn] << 2) +
176 (inBuffer[startIn + 1] >>> 4));
177 outBuffer[startOut + 1] = (byte) ((inBuffer[startIn + 1] << 4) +
178 (inBuffer[startIn + 2] >>> 2));
179 startOut += 2;
180 startIn += 3;
181 } else if (dataLen - startIn > 1) {
182 outBuffer[startOut] = (byte) ((inBuffer[startIn] << 2) +
183 (inBuffer[startIn + 1] >>> 4));
184 startOut += 1;
185 startIn += 2;
186 } else {
187 throw new IllegalStateException ("com.jcorporate.expresso.core.misc." +
188 "Base64.Decode: Corrupt Input Data");
189 }
190 }
191
192 byte[] finalOutput = new byte[startOut];
194
195 for (i = 0; i < startOut; i++) {
196 finalOutput[i] = outBuffer[i];
197 }
198
199 inBuffer = null;
200 outBuffer = null;
201
202 return finalOutput;
203 }
204
205
206
219 static public byte[] decodeNoPadding(String data)
220 throws IllegalArgumentException {
221 String myName = "Base64.decodeNoPadding";
222
223 if (data == null) {
224 throw new IllegalArgumentException (myName + " parameter 'data'" +
225 " must not be null");
226 }
227 if (data.length() == 0) {
228 throw new IllegalArgumentException (myName + " parameter 'data'" +
229 " must not be greater than zero length");
230 }
231 for (; data.length() % 4 != 0; data = data + "=") {
233 ;
234 }
235
236 return decode(data);
237 }
238
239
240
247 static private String encode(byte[] inBuffer)
248 throws IllegalArgumentException {
249 if (inBuffer.length == 0) {
250 throw new IllegalArgumentException ("Base64.encode: " +
251 "inBuffer must be > zero bytes in length");
252 }
253
254 int dataSize = inBuffer.length;
255 int startIn = 0;
256 int startOut = 0;
257
258 byte[] outBuffer;
261
262 if (dataSize < 4) {
263 outBuffer = new byte[4];
264 } else {
265 outBuffer = new byte[dataSize * 2];
266 }
267 while (startIn < dataSize) {
269 int dataLen = inBuffer.length;
270 byte a;
271 byte b;
272 byte c;
273
274 if ((startOut % bytesPerLine) + 4 > bytesPerLine) {
276 outBuffer[startOut] = (byte) '\r';
277 outBuffer[startOut + 1] = (byte) '\n';
278 startOut += 2;
279 }
280 if (dataLen - startIn > 2) {
281 a = inBuffer[startIn];
282 b = inBuffer[startIn + 1];
283 c = inBuffer[startIn + 2];
284 outBuffer[startOut] = (byte) vec[(a >>> 2) & 0x3F];
285 outBuffer[startOut + 1] = (byte) vec[((a << 4) & 0x30) +
286 ((b >>> 4) & 0xf)];
287 outBuffer[startOut + 2] = (byte) vec[((b << 2) & 0x3c) +
288 ((c >>> 6) & 0x3)];
289 outBuffer[startOut + 3] = (byte) vec[c & 0x3F];
290 startOut += 4;
291 startIn += 3;
292 } else if (dataLen - startIn == 1) {
293 a = inBuffer[startIn];
294 b = 0;
295 c = 0;
296 outBuffer[startOut] = (byte) vec[(a >>> 2) & 0x3F];
297 outBuffer[startOut + 1] = (byte) vec[((a << 4) & 0x30) +
298 ((b >>> 4) & 0xf)];
299 outBuffer[startOut + 2] = padding;
300 outBuffer[startOut + 3] = padding;
301 startOut += 4;
302 startIn += 2;
303 } else if (dataLen - startIn == 2) {
304 a = inBuffer[startIn];
305 b = inBuffer[startIn + 1];
306 c = 0;
307 outBuffer[startOut] = (byte) vec[(a >>> 2) & 0x3F];
308 outBuffer[startOut + 1] = (byte) vec[((a << 4) & 0x30) +
309 ((b >>> 4) & 0xf)];
310 outBuffer[startOut + 2] = (byte) vec[((b << 2) & 0x3c) +
311 ((c >>> 6) & 0x3)];
312 outBuffer[startOut + 3] = padding;
313 startOut += 4;
314 startIn += 2;
315 }
316 }
317
318 return new String (outBuffer, 0, startOut);
319 }
320
321
322
323
324
325
326
327
341 static public String encodeNoPadding(byte[] inBuffer)
342 throws IllegalArgumentException {
343 String stringWithPadding = encode(inBuffer);
344 int equalsPlacement = stringWithPadding.indexOf((int) '=');
345
346 return (equalsPlacement != -1)
347 ? (stringWithPadding.substring(0, equalsPlacement))
348 : (stringWithPadding);
349 }
350
351
352 } |
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