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1   package org.codehaus.aspectwerkz.util;
2   
3   /***
4    * Encodes and decodes to and from Base64 notation.
5    *
6    * <p>
7    * Change Log:
8    * </p>
9    * <ul>
10   *  <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added
11   *   some convenience methods for reading and writing to and from files.</li>
12   *  <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems
13   *   with other encodings (like EBCDIC).</li>
14   *  <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the
15   *   encoded data was a single byte.</li>
16   *  <li>v2.0 - I got rid of methods that used booleans to set options.
17   *   Now everything is more consolidated and cleaner. The code now detects
18   *   when data that's being decoded is gzip-compressed and will decompress it
19   *   automatically. Generally things are cleaner. You'll probably have to
20   *   change some method calls that you were making to support the new
21   *   options format (<tt>int</tt>s that you "OR" together).</li>
22   *  <li>v1.5.1 - Fixed bug when decompressing and decoding to a
23   *   byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.
24   *   Added the ability to "suspend" encoding in the Output Stream so
25   *   you can turn on and off the encoding if you need to embed base64
26   *   data in an otherwise "normal" stream (like an XML file).</li>
27   *  <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.
28   *      This helps when using GZIP streams.
29   *      Added the ability to GZip-compress objects before encoding them.</li>
30   *  <li>v1.4 - Added helper methods to read/write files.</li>
31   *  <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>
32   *  <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream
33   *      where last buffer being read, if not completely full, was not returned.</li>
34   *  <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li>
35   *  <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>
36   * </ul>
37   *
38   * <p>
39   * I am placing this code in the Public Domain. Do with it as you will.
40   * This software comes with no guarantees or warranties but with
41   * plenty of well-wishing instead!
42   * Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a>
43   * periodically to check for updates or to contribute improvements.
44   * </p>
45   *
46   * @author Robert Harder
47   * @author rob@iharder.net
48   * @version 2.1
49   */
50  public class Base64
51  {
52  
53  /* ********  P U B L I C   F I E L D S  ******** */
54  
55  
56      /*** No options specified. Value is zero. */
57      public final static int NO_OPTIONS = 0;
58  
59      /*** Specify encoding. */
60      public final static int ENCODE = 1;
61  
62  
63      /*** Specify decoding. */
64      public final static int DECODE = 0;
65  
66  
67      /*** Specify that data should be gzip-compressed. */
68      public final static int GZIP = 2;
69  
70  
71      /*** Don't break lines when encoding (violates strict Base64 specification) */
72      public final static int DONT_BREAK_LINES = 8;
73  
74  
75  /* ********  P R I V A T E   F I E L D S  ******** */
76  
77  
78      /*** Maximum line length (76) of Base64 output. */
79      private final static int MAX_LINE_LENGTH = 76;
80  
81  
82      /*** The equals sign (=) as a byte. */
83      private final static byte EQUALS_SIGN = (byte)'=';
84  
85  
86      /*** The new line character (\n) as a byte. */
87      private final static byte NEW_LINE = (byte)'\n';
88  
89  
90      /*** Preferred encoding. */
91      private final static String PREFERRED_ENCODING = "UTF-8";
92  
93  
94      /*** The 64 valid Base64 values. */
95      private final static byte[] ALPHABET;
96      private final static byte[] _NATIVE_ALPHABET = /* May be something funny like EBCDIC */
97      {
98          (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
99          (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
100         (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
101         (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
102         (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
103         (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
104         (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
105         (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
106         (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
107         (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'
108     };
109 
110     /*** Determine which ALPHABET to use. */
111     static
112     {
113         byte[] __bytes;
114         try
115         {
116             __bytes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".getBytes( PREFERRED_ENCODING );
117         }   // end try
118         catch (java.io.UnsupportedEncodingException use)
119         {
120             __bytes = _NATIVE_ALPHABET; // Fall back to native encoding
121         }   // end catch
122         ALPHABET = __bytes;
123     }   // end static
124 
125 
126     /***
127      * Translates a Base64 value to either its 6-bit reconstruction value
128      * or a negative number indicating some other meaning.
129      **/
130     private final static byte[] DECODABET =
131     {
132         -9,-9,-9,-9,-9,-9,-9,-9,-9,                 // Decimal  0 -  8
133         -5,-5,                                      // Whitespace: Tab and Linefeed
134         -9,-9,                                      // Decimal 11 - 12
135         -5,                                         // Whitespace: Carriage Return
136         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 14 - 26
137         -9,-9,-9,-9,-9,                             // Decimal 27 - 31
138         -5,                                         // Whitespace: Space
139         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,              // Decimal 33 - 42
140         62,                                         // Plus sign at decimal 43
141         -9,-9,-9,                                   // Decimal 44 - 46
142         63,                                         // Slash at decimal 47
143         52,53,54,55,56,57,58,59,60,61,              // Numbers zero through nine
144         -9,-9,-9,                                   // Decimal 58 - 60
145         -1,                                         // Equals sign at decimal 61
146         -9,-9,-9,                                      // Decimal 62 - 64
147         0,1,2,3,4,5,6,7,8,9,10,11,12,13,            // Letters 'A' through 'N'
148         14,15,16,17,18,19,20,21,22,23,24,25,        // Letters 'O' through 'Z'
149         -9,-9,-9,-9,-9,-9,                          // Decimal 91 - 96
150         26,27,28,29,30,31,32,33,34,35,36,37,38,     // Letters 'a' through 'm'
151         39,40,41,42,43,44,45,46,47,48,49,50,51,     // Letters 'n' through 'z'
152         -9,-9,-9,-9                                 // Decimal 123 - 126
153         /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 127 - 139
154         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
155         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
156         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
157         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
158         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
159         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
160         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
161         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
162         -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
163     };
164 
165     // I think I end up not using the BAD_ENCODING indicator.
166     //private final static byte BAD_ENCODING    = -9; // Indicates error in encoding
167     private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
168     private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding
169 
170 
171     /*** Defeats instantiation. */
172     private Base64(){}
173 
174 
175 
176 /* ********  E N C O D I N G   M E T H O D S  ******** */
177 
178 
179     /***
180      * Encodes up to the first three bytes of array <var>threeBytes</var>
181      * and returns a four-byte array in Base64 notation.
182      * The actual number of significant bytes in your array is
183      * given by <var>numSigBytes</var>.
184      * The array <var>threeBytes</var> needs only be as big as
185      * <var>numSigBytes</var>.
186      * Code can reuse a byte array by passing a four-byte array as <var>b4</var>.
187      *
188      * @param b4 A reusable byte array to reduce array instantiation
189      * @param threeBytes the array to convert
190      * @param numSigBytes the number of significant bytes in your array
191      * @return four byte array in Base64 notation.
192      * @since 1.5.1
193      */
194     private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes )
195     {
196         encode3to4( threeBytes, 0, numSigBytes, b4, 0 );
197         return b4;
198     }   // end encode3to4
199 
200 
201     /***
202      * Encodes up to three bytes of the array <var>source</var>
203      * and writes the resulting four Base64 bytes to <var>destination</var>.
204      * The source and destination arrays can be manipulated
205      * anywhere along their length by specifying
206      * <var>srcOffset</var> and <var>destOffset</var>.
207      * This method does not check to make sure your arrays
208      * are large enough to accomodate <var>srcOffset</var> + 3 for
209      * the <var>source</var> array or <var>destOffset</var> + 4 for
210      * the <var>destination</var> array.
211      * The actual number of significant bytes in your array is
212      * given by <var>numSigBytes</var>.
213      *
214      * @param source the array to convert
215      * @param srcOffset the index where conversion begins
216      * @param numSigBytes the number of significant bytes in your array
217      * @param destination the array to hold the conversion
218      * @param destOffset the index where output will be put
219      * @return the <var>destination</var> array
220      * @since 1.3
221      */
222     private static byte[] encode3to4(
223      byte[] source, int srcOffset, int numSigBytes,
224      byte[] destination, int destOffset )
225     {
226         //           1         2         3
227         // 01234567890123456789012345678901 Bit position
228         // --------000000001111111122222222 Array position from threeBytes
229         // --------|    ||    ||    ||    | Six bit groups to index ALPHABET
230         //          >>18  >>12  >> 6  >> 0  Right shift necessary
231         //                0x3f  0x3f  0x3f  Additional AND
232 
233         // Create buffer with zero-padding if there are only one or two
234         // significant bytes passed in the array.
235         // We have to shift left 24 in order to flush out the 1's that appear
236         // when Java treats a value as negative that is cast from a byte to an int.
237         int inBuff =   ( numSigBytes > 0 ? ((source[ srcOffset     ] << 24) >>>  8) : 0 )
238                      | ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 )
239                      | ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 );
240 
241         switch( numSigBytes )
242         {
243             case 3:
244                 destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];
245                 destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
246                 destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ];
247                 destination[ destOffset + 3 ] = ALPHABET[ (inBuff       ) & 0x3f ];
248                 return destination;
249 
250             case 2:
251                 destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];
252                 destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
253                 destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ];
254                 destination[ destOffset + 3 ] = EQUALS_SIGN;
255                 return destination;
256 
257             case 1:
258                 destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];
259                 destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
260                 destination[ destOffset + 2 ] = EQUALS_SIGN;
261                 destination[ destOffset + 3 ] = EQUALS_SIGN;
262                 return destination;
263 
264             default:
265                 return destination;
266         }   // end switch
267     }   // end encode3to4
268 
269 
270 
271     /***
272      * Serializes an object and returns the Base64-encoded
273      * version of that serialized object. If the object
274      * cannot be serialized or there is another error,
275      * the method will return <tt>null</tt>.
276      * The object is not GZip-compressed before being encoded.
277      *
278      * @param serializableObject The object to encode
279      * @return The Base64-encoded object
280      * @since 1.4
281      */
282     public static String encodeObject( java.io.Serializable serializableObject )
283     {
284         return encodeObject( serializableObject, NO_OPTIONS );
285     }   // end encodeObject
286 
287 
288 
289     /***
290      * Serializes an object and returns the Base64-encoded
291      * version of that serialized object. If the object
292      * cannot be serialized or there is another error,
293      * the method will return <tt>null</tt>.
294      * <p>
295      * Valid options:<pre>
296      *   GZIP: gzip-compresses object before encoding it.
297      *   DONT_BREAK_LINES: don't break lines at 76 characters
298      *     <i>Note: Technically, this makes your encoding non-compliant.</i>
299      * </pre>
300      * <p>
301      * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or
302      * <p>
303      * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
304      *
305      * @param serializableObject The object to encode
306      * @param options Specified options
307      * @return The Base64-encoded object
308      * @see Base64#GZIP
309      * @see Base64#DONT_BREAK_LINES
310      * @since 2.0
311      */
312     public static String encodeObject( java.io.Serializable serializableObject, int options )
313     {
314         // Streams
315         java.io.ByteArrayOutputStream  baos  = null;
316         java.io.OutputStream           b64os = null;
317         java.io.ObjectOutputStream     oos   = null;
318         java.util.zip.GZIPOutputStream gzos  = null;
319 
320         // Isolate options
321         int gzip           = (options & GZIP);
322         int dontBreakLines = (options & DONT_BREAK_LINES);
323 
324         try
325         {
326             // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
327             baos  = new java.io.ByteArrayOutputStream();
328             b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines );
329 
330             // GZip?
331             if( gzip == GZIP )
332             {
333                 gzos = new java.util.zip.GZIPOutputStream( b64os );
334                 oos  = new java.io.ObjectOutputStream( gzos );
335             }   // end if: gzip
336             else
337                 oos   = new java.io.ObjectOutputStream( b64os );
338 
339             oos.writeObject( serializableObject );
340         }   // end try
341         catch( java.io.IOException e )
342         {
343             e.printStackTrace();
344             return null;
345         }   // end catch
346         finally
347         {
348             try{ oos.close();   } catch( Exception e ){}
349             try{ gzos.close();  } catch( Exception e ){}
350             try{ b64os.close(); } catch( Exception e ){}
351             try{ baos.close();  } catch( Exception e ){}
352         }   // end finally
353 
354         // Return value according to relevant encoding.
355         try
356         {
357             return new String( baos.toByteArray(), PREFERRED_ENCODING );
358         }   // end try
359         catch (java.io.UnsupportedEncodingException uue)
360         {
361             return new String( baos.toByteArray() );
362         }   // end catch
363 
364     }   // end encode
365 
366 
367 
368     /***
369      * Encodes a byte array into Base64 notation.
370      * Does not GZip-compress data.
371      *
372      * @param source The data to convert
373      * @since 1.4
374      */
375     public static String encodeBytes( byte[] source )
376     {
377         return encodeBytes( source, 0, source.length, NO_OPTIONS );
378     }   // end encodeBytes
379 
380 
381 
382     /***
383      * Encodes a byte array into Base64 notation.
384      * <p>
385      * Valid options:<pre>
386      *   GZIP: gzip-compresses object before encoding it.
387      *   DONT_BREAK_LINES: don't break lines at 76 characters
388      *     <i>Note: Technically, this makes your encoding non-compliant.</i>
389      * </pre>
390      * <p>
391      * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
392      * <p>
393      * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
394      *
395      *
396      * @param source The data to convert
397      * @param options Specified options
398      * @see Base64#GZIP
399      * @see Base64#DONT_BREAK_LINES
400      * @since 2.0
401      */
402     public static String encodeBytes( byte[] source, int options )
403     {
404         return encodeBytes( source, 0, source.length, options );
405     }   // end encodeBytes
406 
407 
408     /***
409      * Encodes a byte array into Base64 notation.
410      * Does not GZip-compress data.
411      *
412      * @param source The data to convert
413      * @param off Offset in array where conversion should begin
414      * @param len Length of data to convert
415      * @since 1.4
416      */
417     public static String encodeBytes( byte[] source, int off, int len )
418     {
419         return encodeBytes( source, off, len, NO_OPTIONS );
420     }   // end encodeBytes
421 
422 
423 
424     /***
425      * Encodes a byte array into Base64 notation.
426      * <p>
427      * Valid options:<pre>
428      *   GZIP: gzip-compresses object before encoding it.
429      *   DONT_BREAK_LINES: don't break lines at 76 characters
430      *     <i>Note: Technically, this makes your encoding non-compliant.</i>
431      * </pre>
432      * <p>
433      * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
434      * <p>
435      * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
436      *
437      *
438      * @param source The data to convert
439      * @param off Offset in array where conversion should begin
440      * @param len Length of data to convert
441      * @param options Specified options
442      * @see Base64#GZIP
443      * @see Base64#DONT_BREAK_LINES
444      * @since 2.0
445      */
446     public static String encodeBytes( byte[] source, int off, int len, int options )
447     {
448         // Isolate options
449         int dontBreakLines = ( options & DONT_BREAK_LINES );
450         int gzip           = ( options & GZIP   );
451 
452         // Compress?
453         if( gzip == GZIP )
454         {
455             java.io.ByteArrayOutputStream  baos  = null;
456             java.util.zip.GZIPOutputStream gzos  = null;
457             Base64.OutputStream            b64os = null;
458 
459 
460             try
461             {
462                 // GZip -> Base64 -> ByteArray
463                 baos = new java.io.ByteArrayOutputStream();
464                 b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines );
465                 gzos  = new java.util.zip.GZIPOutputStream( b64os );
466 
467                 gzos.write( source, off, len );
468                 gzos.close();
469             }   // end try
470             catch( java.io.IOException e )
471             {
472                 e.printStackTrace();
473                 return null;
474             }   // end catch
475             finally
476             {
477                 try{ gzos.close();  } catch( Exception e ){}
478                 try{ b64os.close(); } catch( Exception e ){}
479                 try{ baos.close();  } catch( Exception e ){}
480             }   // end finally
481 
482             // Return value according to relevant encoding.
483             try
484             {
485                 return new String( baos.toByteArray(), PREFERRED_ENCODING );
486             }   // end try
487             catch (java.io.UnsupportedEncodingException uue)
488             {
489                 return new String( baos.toByteArray() );
490             }   // end catch
491         }   // end if: compress
492 
493         // Else, don't compress. Better not to use streams at all then.
494         else
495         {
496             // Convert option to boolean in way that code likes it.
497             boolean breakLines = dontBreakLines == 0;
498 
499             int    len43   = len * 4 / 3;
500             byte[] outBuff = new byte[   ( len43 )                      // Main 4:3
501                                        + ( (len % 3) > 0 ? 4 : 0 )      // Account for padding
502                                        + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines
503             int d = 0;
504             int e = 0;
505             int len2 = len - 2;
506             int lineLength = 0;
507             for( ; d < len2; d+=3, e+=4 )
508             {
509                 encode3to4( source, d+off, 3, outBuff, e );
510 
511                 lineLength += 4;
512                 if( breakLines && lineLength == MAX_LINE_LENGTH )
513                 {
514                     outBuff[e+4] = NEW_LINE;
515                     e++;
516                     lineLength = 0;
517                 }   // end if: end of line
518             }   // en dfor: each piece of array
519 
520             if( d < len )
521             {
522                 encode3to4( source, d+off, len - d, outBuff, e );
523                 e += 4;
524             }   // end if: some padding needed
525 
526 
527             // Return value according to relevant encoding.
528             try
529             {
530                 return new String( outBuff, 0, e, PREFERRED_ENCODING );
531             }   // end try
532             catch (java.io.UnsupportedEncodingException uue)
533             {
534                 return new String( outBuff, 0, e );
535             }   // end catch
536 
537         }   // end else: don't compress
538 
539     }   // end encodeBytes
540 
541 
542 
543 
544 
545 /* ********  D E C O D I N G   M E T H O D S  ******** */
546 
547 
548     /***
549      * Decodes four bytes from array <var>source</var>
550      * and writes the resulting bytes (up to three of them)
551      * to <var>destination</var>.
552      * The source and destination arrays can be manipulated
553      * anywhere along their length by specifying
554      * <var>srcOffset</var> and <var>destOffset</var>.
555      * This method does not check to make sure your arrays
556      * are large enough to accomodate <var>srcOffset</var> + 4 for
557      * the <var>source</var> array or <var>destOffset</var> + 3 for
558      * the <var>destination</var> array.
559      * This method returns the actual number of bytes that
560      * were converted from the Base64 encoding.
561      *
562      *
563      * @param source the array to convert
564      * @param srcOffset the index where conversion begins
565      * @param destination the array to hold the conversion
566      * @param destOffset the index where output will be put
567      * @return the number of decoded bytes converted
568      * @since 1.3
569      */
570     private static int decode4to3( byte[] source, int srcOffset, byte[] destination, int destOffset )
571     {
572         // Example: Dk==
573         if( source[ srcOffset + 2] == EQUALS_SIGN )
574         {
575             // Two ways to do the same thing. Don't know which way I like best.
576             //int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] << 24 ) >>>  6 )
577             //              | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
578             int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] & 0xFF ) << 18 )
579                           | ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 );
580 
581             destination[ destOffset ] = (byte)( outBuff >>> 16 );
582             return 1;
583         }
584 
585         // Example: DkL=
586         else if( source[ srcOffset + 3 ] == EQUALS_SIGN )
587         {
588             // Two ways to do the same thing. Don't know which way I like best.
589             //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )
590             //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
591             //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
592             int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 )
593                           | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
594                           | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6 );
595 
596             destination[ destOffset     ] = (byte)( outBuff >>> 16 );
597             destination[ destOffset + 1 ] = (byte)( outBuff >>>  8 );
598             return 2;
599         }
600 
601         // Example: DkLE
602         else
603         {
604             try{
605             // Two ways to do the same thing. Don't know which way I like best.
606             //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )
607             //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
608             //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
609             //              | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
610             int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 )
611                           | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
612                           | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6)
613                           | ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF )      );
614 
615 
616             destination[ destOffset     ] = (byte)( outBuff >> 16 );
617             destination[ destOffset + 1 ] = (byte)( outBuff >>  8 );
618             destination[ destOffset + 2 ] = (byte)( outBuff       );
619 
620             return 3;
621             }catch( Exception e){
622                 System.out.println(""+source[srcOffset]+ ": " + ( DECODABET[ source[ srcOffset     ] ]  ) );
623                 System.out.println(""+source[srcOffset+1]+  ": " + ( DECODABET[ source[ srcOffset + 1 ] ]  ) );
624                 System.out.println(""+source[srcOffset+2]+  ": " + ( DECODABET[ source[ srcOffset + 2 ] ]  ) );
625                 System.out.println(""+source[srcOffset+3]+  ": " + ( DECODABET[ source[ srcOffset + 3 ] ]  ) );
626                 return -1;
627             }   //e nd catch
628         }
629     }   // end decodeToBytes
630 
631 
632 
633 
634     /***
635      * Very low-level access to decoding ASCII characters in
636      * the form of a byte array. Does not support automatically
637      * gunzipping or any other "fancy" features.
638      *
639      * @param source The Base64 encoded data
640      * @param off    The offset of where to begin decoding
641      * @param len    The length of characters to decode
642      * @return decoded data
643      * @since 1.3
644      */
645     public static byte[] decode( byte[] source, int off, int len )
646     {
647         int    len34   = len * 3 / 4;
648         byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output
649         int    outBuffPosn = 0;
650 
651         byte[] b4        = new byte[4];
652         int    b4Posn    = 0;
653         int    i         = 0;
654         byte   sbiCrop   = 0;
655         byte   sbiDecode = 0;
656         for( i = off; i < off+len; i++ )
657         {
658             sbiCrop = (byte)(source[i] & 0x7f); // Only the low seven bits
659             sbiDecode = DECODABET[ sbiCrop ];
660 
661             if( sbiDecode >= WHITE_SPACE_ENC ) // White space, Equals sign or better
662             {
663                 if( sbiDecode >= EQUALS_SIGN_ENC )
664                 {
665                     b4[ b4Posn++ ] = sbiCrop;
666                     if( b4Posn > 3 )
667                     {
668                         outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn );
669                         b4Posn = 0;
670 
671                         // If that was the equals sign, break out of 'for' loop
672                         if( sbiCrop == EQUALS_SIGN )
673                             break;
674                     }   // end if: quartet built
675 
676                 }   // end if: equals sign or better
677 
678             }   // end if: white space, equals sign or better
679             else
680             {
681                 System.err.println( "Bad Base64 input character at " + i + ": " + source[i] + "(decimal)" );
682                 return null;
683             }   // end else:
684         }   // each input character
685 
686         byte[] out = new byte[ outBuffPosn ];
687         System.arraycopy( outBuff, 0, out, 0, outBuffPosn );
688         return out;
689     }   // end decode
690 
691 
692 
693 
694     /***
695      * Decodes data from Base64 notation, automatically
696      * detecting gzip-compressed data and decompressing it.
697      *
698      * @param s the string to decode
699      * @return the decoded data
700      * @since 1.4
701      */
702     public static byte[] decode( String s )
703     {
704         byte[] bytes;
705         try
706         {
707             bytes = s.getBytes( PREFERRED_ENCODING );
708         }   // end try
709         catch( java.io.UnsupportedEncodingException uee )
710         {
711             bytes = s.getBytes();
712         }   // end catch
713 		//</change>
714 
715         // Decode
716         bytes = decode( bytes, 0, bytes.length );
717 
718 
719         // Check to see if it's gzip-compressed
720         // GZIP Magic Two-Byte Number: 0x8b1f (35615)
721         if( bytes != null && bytes.length >= 4 )
722         {
723 
724             int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
725             if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head )
726             {
727                 java.io.ByteArrayInputStream  bais = null;
728                 java.util.zip.GZIPInputStream gzis = null;
729                 java.io.ByteArrayOutputStream baos = null;
730                 byte[] buffer = new byte[2048];
731                 int    length = 0;
732 
733                 try
734                 {
735                     baos = new java.io.ByteArrayOutputStream();
736                     bais = new java.io.ByteArrayInputStream( bytes );
737                     gzis = new java.util.zip.GZIPInputStream( bais );
738 
739                     while( ( length = gzis.read( buffer ) ) >= 0 )
740                     {
741                         baos.write(buffer,0,length);
742                     }   // end while: reading input
743 
744                     // No error? Get new bytes.
745                     bytes = baos.toByteArray();
746 
747                 }   // end try
748                 catch( java.io.IOException e )
749                 {
750                     // Just return originally-decoded bytes
751                 }   // end catch
752                 finally
753                 {
754                     try{ baos.close(); } catch( Exception e ){}
755                     try{ gzis.close(); } catch( Exception e ){}
756                     try{ bais.close(); } catch( Exception e ){}
757                 }   // end finally
758 
759             }   // end if: gzipped
760         }   // end if: bytes.length >= 2
761 
762         return bytes;
763     }   // end decode
764 
765 
766 
767 
768     /***
769      * Attempts to decode Base64 data and deserialize a Java
770      * Object within. Returns <tt>null</tt> if there was an error.
771      *
772      * @param encodedObject The Base64 data to decode
773      * @return The decoded and deserialized object
774      * @since 1.5
775      */
776     public static Object decodeToObject( String encodedObject )
777     {
778         // Decode and gunzip if necessary
779         byte[] objBytes = decode( encodedObject );
780 
781         java.io.ByteArrayInputStream  bais = null;
782         java.io.ObjectInputStream     ois  = null;
783         Object obj = null;
784 
785         try
786         {
787             bais = new java.io.ByteArrayInputStream( objBytes );
788             ois  = new java.io.ObjectInputStream( bais );
789 
790             obj = ois.readObject();
791         }   // end try
792         catch( java.io.IOException e )
793         {
794             e.printStackTrace();
795             obj = null;
796         }   // end catch
797         catch( java.lang.ClassNotFoundException e )
798         {
799             e.printStackTrace();
800             obj = null;
801         }   // end catch
802         finally
803         {
804             try{ bais.close(); } catch( Exception e ){}
805             try{ ois.close();  } catch( Exception e ){}
806         }   // end finally
807 
808         return obj;
809     }   // end decodeObject
810 
811 
812 
813     /***
814      * Convenience method for encoding data to a file.
815      *
816      * @param dataToEncode byte array of data to encode in base64 form
817      * @param filename Filename for saving encoded data
818      * @return <tt>true</tt> if successful, <tt>false</tt> otherwise
819      *
820      * @since 2.1
821      */
822     public static boolean encodeToFile( byte[] dataToEncode, String filename )
823     {
824         boolean success = false;
825         Base64.OutputStream bos = null;
826         try
827         {
828             bos = new Base64.OutputStream(
829                       new java.io.FileOutputStream( filename ), Base64.ENCODE );
830             bos.write( dataToEncode );
831             success = true;
832         }   // end try
833         catch( java.io.IOException e )
834         {
835 
836             success = false;
837         }   // end catch: IOException
838         finally
839         {
840             try{ bos.close(); } catch( Exception e ){}
841         }   // end finally
842 
843         return success;
844     }   // end encodeToFile
845 
846 
847     /***
848      * Convenience method for decoding data to a file.
849      *
850      * @param dataToDecode Base64-encoded data as a string
851      * @param filename Filename for saving decoded data
852      * @return <tt>true</tt> if successful, <tt>false</tt> otherwise
853      *
854      * @since 2.1
855      */
856     public static boolean decodeToFile( String dataToDecode, String filename )
857     {
858         boolean success = false;
859         Base64.OutputStream bos = null;
860         try
861         {
862                 bos = new Base64.OutputStream(
863                           new java.io.FileOutputStream( filename ), Base64.DECODE );
864                 bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );
865                 success = true;
866         }   // end try
867         catch( java.io.IOException e )
868         {
869             success = false;
870         }   // end catch: IOException
871         finally
872         {
873                 try{ bos.close(); } catch( Exception e ){}
874         }   // end finally
875 
876         return success;
877     }   // end decodeToFile
878 
879 
880 
881 
882     /***
883      * Convenience method for reading a base64-encoded
884      * file and decoding it.
885      *
886      * @param filename Filename for reading encoded data
887      * @return decoded byte array or null if unsuccessful
888      *
889      * @since 2.1
890      */
891     public static byte[] decodeFromFile( String filename )
892     {
893         byte[] decodedData = null;
894         Base64.InputStream bis = null;
895         try
896         {
897             // Set up some useful variables
898             java.io.File file = new java.io.File( filename );
899             byte[] buffer = null;
900             int length   = 0;
901             int numBytes = 0;
902 
903             // Check for size of file
904             if( file.length() > Integer.MAX_VALUE )
905             {
906                 System.err.println( "File is too big for this convenience method (" + file.length() + " bytes)." );
907                 return null;
908             }   // end if: file too big for int index
909             buffer = new byte[ (int)file.length() ];
910 
911             // Open a stream
912             bis = new Base64.InputStream(
913                       new java.io.BufferedInputStream(
914                       new java.io.FileInputStream( file ) ), Base64.DECODE );
915 
916             // Read until done
917             while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 )
918                 length += numBytes;
919 
920             // Save in a variable to return
921             decodedData = new byte[ length ];
922             System.arraycopy( buffer, 0, decodedData, 0, length );
923 
924         }   // end try
925         catch( java.io.IOException e )
926         {
927             System.err.println( "Error decoding from file " + filename );
928         }   // end catch: IOException
929         finally
930         {
931             try{ bis.close(); } catch( Exception e) {}
932         }   // end finally
933 
934         return decodedData;
935     }   // end decodeFromFile
936 
937 
938 
939     /***
940      * Convenience method for reading a binary file
941      * and base64-encoding it.
942      *
943      * @param filename Filename for reading binary data
944      * @return base64-encoded string or null if unsuccessful
945      *
946      * @since 2.1
947      */
948     public static String encodeFromFile( String filename )
949     {
950         String encodedData = null;
951         Base64.InputStream bis = null;
952         try
953         {
954             // Set up some useful variables
955             java.io.File file = new java.io.File( filename );
956             byte[] buffer = new byte[ (int)(file.length() * 1.4) ];
957             int length   = 0;
958             int numBytes = 0;
959 
960             // Open a stream
961             bis = new Base64.InputStream(
962                       new java.io.BufferedInputStream(
963                       new java.io.FileInputStream( file ) ), Base64.ENCODE );
964 
965             // Read until done
966             while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 )
967                 length += numBytes;
968 
969             // Save in a variable to return
970             encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );
971 
972         }   // end try
973         catch( java.io.IOException e )
974         {
975             System.err.println( "Error encoding from file " + filename );
976         }   // end catch: IOException
977         finally
978         {
979             try{ bis.close(); } catch( Exception e) {}
980         }   // end finally
981 
982         return encodedData;
983         }   // end encodeFromFile
984 
985 
986 
987 
988     /* ********  I N N E R   C L A S S   I N P U T S T R E A M  ******** */
989 
990 
991 
992     /***
993      * A {@link Base64.InputStream} will read data from another
994      * <tt>java.io.InputStream</tt>, given in the constructor,
995      * and encode/decode to/from Base64 notation on the fly.
996      *
997      * @see Base64
998      * @since 1.3
999      */
1000     public static class InputStream extends java.io.FilterInputStream
1001     {
1002         private boolean encode;         // Encoding or decoding
1003         private int     position;       // Current position in the buffer
1004         private byte[]  buffer;         // Small buffer holding converted data
1005         private int     bufferLength;   // Length of buffer (3 or 4)
1006         private int     numSigBytes;    // Number of meaningful bytes in the buffer
1007         private int     lineLength;
1008         private boolean breakLines;     // Break lines at less than 80 characters
1009 
1010 
1011         /***
1012          * Constructs a {@link Base64.InputStream} in DECODE mode.
1013          *
1014          * @param in the <tt>java.io.InputStream</tt> from which to read data.
1015          * @since 1.3
1016          */
1017         public InputStream( java.io.InputStream in )
1018         {
1019             this( in, DECODE );
1020         }   // end constructor
1021 
1022 
1023         /***
1024          * Constructs a {@link Base64.InputStream} in
1025          * either ENCODE or DECODE mode.
1026          * <p>
1027          * Valid options:<pre>
1028          *   ENCODE or DECODE: Encode or Decode as data is read.
1029          *   DONT_BREAK_LINES: don't break lines at 76 characters
1030          *     (only meaningful when encoding)
1031          *     <i>Note: Technically, this makes your encoding non-compliant.</i>
1032          * </pre>
1033          * <p>
1034          * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code>
1035          *
1036          *
1037          * @param in the <tt>java.io.InputStream</tt> from which to read data.
1038          * @param options Specified options
1039          * @see Base64#ENCODE
1040          * @see Base64#DECODE
1041          * @see Base64#DONT_BREAK_LINES
1042          * @since 2.0
1043          */
1044         public InputStream( java.io.InputStream in, int options )
1045         {
1046             super( in );
1047             this.breakLines   = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
1048             this.encode       = (options & ENCODE) == ENCODE;
1049             this.bufferLength = encode ? 4 : 3;
1050             this.buffer   = new byte[ bufferLength ];
1051             this.position = -1;
1052             this.lineLength = 0;
1053         }   // end constructor
1054 
1055         /***
1056          * Reads enough of the input stream to convert
1057          * to/from Base64 and returns the next byte.
1058          *
1059          * @return next byte
1060          * @since 1.3
1061          */
1062         public int read() throws java.io.IOException
1063         {
1064             // Do we need to get data?
1065             if( position < 0 )
1066             {
1067                 if( encode )
1068                 {
1069                     byte[] b3 = new byte[3];
1070                     int numBinaryBytes = 0;
1071                     for( int i = 0; i < 3; i++ )
1072                     {
1073                         try
1074                         {
1075                             int b = in.read();
1076 
1077                             // If end of stream, b is -1.
1078                             if( b >= 0 )
1079                             {
1080                                 b3[i] = (byte)b;
1081                                 numBinaryBytes++;
1082                             }   // end if: not end of stream
1083 
1084                         }   // end try: read
1085                         catch( java.io.IOException e )
1086                         {
1087                             // Only a problem if we got no data at all.
1088                             if( i == 0 )
1089                                 throw e;
1090 
1091                         }   // end catch
1092                     }   // end for: each needed input byte
1093 
1094                     if( numBinaryBytes > 0 )
1095                     {
1096                         encode3to4( b3, 0, numBinaryBytes, buffer, 0 );
1097                         position = 0;
1098                         numSigBytes = 4;
1099                     }   // end if: got data
1100                     else
1101                     {
1102                         return -1;
1103                     }   // end else
1104                 }   // end if: encoding
1105 
1106                 // Else decoding
1107                 else
1108                 {
1109                     byte[] b4 = new byte[4];
1110                     int i = 0;
1111                     for( i = 0; i < 4; i++ )
1112                     {
1113                         // Read four "meaningful" bytes:
1114                         int b = 0;
1115                         do{ b = in.read(); }
1116                         while( b >= 0 && DECODABET[ b & 0x7f ] <= WHITE_SPACE_ENC );
1117 
1118                         if( b < 0 )
1119                             break; // Reads a -1 if end of stream
1120 
1121                         b4[i] = (byte)b;
1122                     }   // end for: each needed input byte
1123 
1124                     if( i == 4 )
1125                     {
1126                         numSigBytes = decode4to3( b4, 0, buffer, 0 );
1127                         position = 0;
1128                     }   // end if: got four characters
1129                     else if( i == 0 ){
1130                         return -1;
1131                     }   // end else if: also padded correctly
1132                     else
1133                     {
1134                         // Must have broken out from above.
1135                         throw new java.io.IOException( "Improperly padded Base64 input." );
1136                     }   // end
1137 
1138                 }   // end else: decode
1139             }   // end else: get data
1140 
1141             // Got data?
1142             if( position >= 0 )
1143             {
1144                 // End of relevant data?
1145                 if( /*!encode &&*/ position >= numSigBytes )
1146                     return -1;
1147 
1148                 if( encode && breakLines && lineLength >= MAX_LINE_LENGTH )
1149                 {
1150                     lineLength = 0;
1151                     return '\n';
1152                 }   // end if
1153                 else
1154                 {
1155                     lineLength++;   // This isn't important when decoding
1156                                     // but throwing an extra "if" seems
1157                                     // just as wasteful.
1158 
1159                     int b = buffer[ position++ ];
1160 
1161                     if( position >= bufferLength )
1162                         position = -1;
1163 
1164                     return b & 0xFF; // This is how you "cast" a byte that's
1165                                      // intended to be unsigned.
1166                 }   // end else
1167             }   // end if: position >= 0
1168 
1169             // Else error
1170             else
1171             {
1172                 // When JDK1.4 is more accepted, use an assertion here.
1173                 throw new java.io.IOException( "Error in Base64 code reading stream." );
1174             }   // end else
1175         }   // end read
1176 
1177 
1178         /***
1179          * Calls {@link #read()} repeatedly until the end of stream
1180          * is reached or <var>len</var> bytes are read.
1181          * Returns number of bytes read into array or -1 if
1182          * end of stream is encountered.
1183          *
1184          * @param dest array to hold values
1185          * @param off offset for array
1186          * @param len max number of bytes to read into array
1187          * @return bytes read into array or -1 if end of stream is encountered.
1188          * @since 1.3
1189          */
1190         public int read( byte[] dest, int off, int len ) throws java.io.IOException
1191         {
1192             int i;
1193             int b;
1194             for( i = 0; i < len; i++ )
1195             {
1196                 b = read();
1197 
1198                 //if( b < 0 && i == 0 )
1199                 //    return -1;
1200 
1201                 if( b >= 0 )
1202                     dest[off + i] = (byte)b;
1203                 else if( i == 0 )
1204                     return -1;
1205                 else
1206                     break; // Out of 'for' loop
1207             }   // end for: each byte read
1208             return i;
1209         }   // end read
1210 
1211     }   // end inner class InputStream
1212 
1213 
1214 
1215 
1216 
1217 
1218     /* ********  I N N E R   C L A S S   O U T P U T S T R E A M  ******** */
1219 
1220 
1221 
1222     /***
1223      * A {@link Base64.OutputStream} will write data to another
1224      * <tt>java.io.OutputStream</tt>, given in the constructor,
1225      * and encode/decode to/from Base64 notation on the fly.
1226      *
1227      * @see Base64
1228      * @since 1.3
1229      */
1230     public static class OutputStream extends java.io.FilterOutputStream
1231     {
1232         private boolean encode;
1233         private int     position;
1234         private byte[]  buffer;
1235         private int     bufferLength;
1236         private int     lineLength;
1237         private boolean breakLines;
1238         private byte[]  b4; // Scratch used in a few places
1239         private boolean suspendEncoding;
1240 
1241         /***
1242          * Constructs a {@link Base64.OutputStream} in ENCODE mode.
1243          *
1244          * @param out the <tt>java.io.OutputStream</tt> to which data will be written.
1245          * @since 1.3
1246          */
1247         public OutputStream( java.io.OutputStream out )
1248         {
1249             this( out, ENCODE );
1250         }   // end constructor
1251 
1252 
1253         /***
1254          * Constructs a {@link Base64.OutputStream} in
1255          * either ENCODE or DECODE mode.
1256          * <p>
1257          * Valid options:<pre>
1258          *   ENCODE or DECODE: Encode or Decode as data is read.
1259          *   DONT_BREAK_LINES: don't break lines at 76 characters
1260          *     (only meaningful when encoding)
1261          *     <i>Note: Technically, this makes your encoding non-compliant.</i>
1262          * </pre>
1263          * <p>
1264          * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code>
1265          *
1266          * @param out the <tt>java.io.OutputStream</tt> to which data will be written.
1267          * @param options Specified options.
1268          * @see Base64#ENCODE
1269          * @see Base64#DECODE
1270          * @see Base64#DONT_BREAK_LINES
1271          * @since 1.3
1272          */
1273         public OutputStream( java.io.OutputStream out, int options )
1274         {
1275             super( out );
1276             this.breakLines   = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
1277             this.encode       = (options & ENCODE) == ENCODE;
1278             this.bufferLength = encode ? 3 : 4;
1279             this.buffer       = new byte[ bufferLength ];
1280             this.position     = 0;
1281             this.lineLength   = 0;
1282             this.suspendEncoding = false;
1283             this.b4           = new byte[4];
1284         }   // end constructor
1285 
1286 
1287         /***
1288          * Writes the byte to the output stream after
1289          * converting to/from Base64 notation.
1290          * When encoding, bytes are buffered three
1291          * at a time before the output stream actually
1292          * gets a write() call.
1293          * When decoding, bytes are buffered four
1294          * at a time.
1295          *
1296          * @param theByte the byte to write
1297          * @since 1.3
1298          */
1299         public void write(int theByte) throws java.io.IOException
1300         {
1301             // Encoding suspended?
1302             if( suspendEncoding )
1303             {
1304                 super.out.write( theByte );
1305                 return;
1306             }   // end if: supsended
1307 
1308             // Encode?
1309             if( encode )
1310             {
1311                 buffer[ position++ ] = (byte)theByte;
1312                 if( position >= bufferLength )  // Enough to encode.
1313                 {
1314                     out.write( encode3to4( b4, buffer, bufferLength ) );
1315 
1316                     lineLength += 4;
1317                     if( breakLines && lineLength >= MAX_LINE_LENGTH )
1318                     {
1319                         out.write( NEW_LINE );
1320                         lineLength = 0;
1321                     }   // end if: end of line
1322 
1323                     position = 0;
1324                 }   // end if: enough to output
1325             }   // end if: encoding
1326 
1327             // Else, Decoding
1328             else
1329             {
1330                 // Meaningful Base64 character?
1331                 if( DECODABET[ theByte & 0x7f ] > WHITE_SPACE_ENC )
1332                 {
1333                     buffer[ position++ ] = (byte)theByte;
1334                     if( position >= bufferLength )  // Enough to output.
1335                     {
1336                         int len = Base64.decode4to3( buffer, 0, b4, 0 );
1337                         out.write( b4, 0, len );
1338                         //out.write( Base64.decode4to3( buffer ) );
1339                         position = 0;
1340                     }   // end if: enough to output
1341                 }   // end if: meaningful base64 character
1342                 else if( DECODABET[ theByte & 0x7f ] != WHITE_SPACE_ENC )
1343                 {
1344                     throw new java.io.IOException( "Invalid character in Base64 data." );
1345                 }   // end else: not white space either
1346             }   // end else: decoding
1347         }   // end write
1348 
1349 
1350 
1351         /***
1352          * Calls {@link #write(int)} repeatedly until <var>len</var>
1353          * bytes are written.
1354          *
1355          * @param theBytes array from which to read bytes
1356          * @param off offset for array
1357          * @param len max number of bytes to read into array
1358          * @since 1.3
1359          */
1360         public void write( byte[] theBytes, int off, int len ) throws java.io.IOException
1361         {
1362             // Encoding suspended?
1363             if( suspendEncoding )
1364             {
1365                 super.out.write( theBytes, off, len );
1366                 return;
1367             }   // end if: supsended
1368 
1369             for( int i = 0; i < len; i++ )
1370             {
1371                 write( theBytes[ off + i ] );
1372             }   // end for: each byte written
1373 
1374         }   // end write
1375 
1376 
1377 
1378         /***
1379          * Method added by PHIL. [Thanks, PHIL. -Rob]
1380          * This pads the buffer without closing the stream.
1381          */
1382         public void flushBase64() throws java.io.IOException
1383         {
1384             if( position > 0 )
1385             {
1386                 if( encode )
1387                 {
1388                     out.write( encode3to4( b4, buffer, position ) );
1389                     position = 0;
1390                 }   // end if: encoding
1391                 else
1392                 {
1393                     throw new java.io.IOException( "Base64 input not properly padded." );
1394                 }   // end else: decoding
1395             }   // end if: buffer partially full
1396 
1397         }   // end flush
1398 
1399 
1400         /***
1401          * Flushes and closes (I think, in the superclass) the stream.
1402          *
1403          * @since 1.3
1404          */
1405         public void close() throws java.io.IOException
1406         {
1407             // 1. Ensure that pending characters are written
1408             flushBase64();
1409 
1410             // 2. Actually close the stream
1411             // Base class both flushes and closes.
1412             super.close();
1413 
1414             buffer = null;
1415             out    = null;
1416         }   // end close
1417 
1418 
1419 
1420         /***
1421          * Suspends encoding of the stream.
1422          * May be helpful if you need to embed a piece of
1423          * base640-encoded data in a stream.
1424          *
1425          * @since 1.5.1
1426          */
1427         public void suspendEncoding() throws java.io.IOException
1428         {
1429             flushBase64();
1430             this.suspendEncoding = true;
1431         }   // end suspendEncoding
1432 
1433 
1434         /***
1435          * Resumes encoding of the stream.
1436          * May be helpful if you need to embed a piece of
1437          * base640-encoded data in a stream.
1438          *
1439          * @since 1.5.1
1440          */
1441         public void resumeEncoding()
1442         {
1443             this.suspendEncoding = false;
1444         }   // end resumeEncoding
1445 
1446 
1447 
1448     }   // end inner class OutputStream
1449 
1450 
1451 }   // end class Base64