--- /dev/null
+package be.nikiroo.utils;
+
+/**
+ * <p>Encodes and decodes to and from Base64 notation.</p>
+ * <p>Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>.</p>
+ *
+ * <p>Example:</p>
+ *
+ * <code>String encoded = Base64.encode( myByteArray );</code>
+ * <br />
+ * <code>byte[] myByteArray = Base64.decode( encoded );</code>
+ *
+ * <p>The <tt>options</tt> parameter, which appears in a few places, is used to pass
+ * several pieces of information to the encoder. In the "higher level" methods such as
+ * encodeBytes( bytes, options ) the options parameter can be used to indicate such
+ * things as first gzipping the bytes before encoding them, not inserting linefeeds,
+ * and encoding using the URL-safe and Ordered dialects.</p>
+ *
+ * <p>Note, according to <a href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>,
+ * Section 2.1, implementations should not add line feeds unless explicitly told
+ * to do so. I've got Base64 set to this behavior now, although earlier versions
+ * broke lines by default.</p>
+ *
+ * <p>The constants defined in Base64 can be OR-ed together to combine options, so you
+ * might make a call like this:</p>
+ *
+ * <code>String encoded = Base64.encodeBytes( mybytes, Base64.GZIP | Base64.DO_BREAK_LINES );</code>
+ * <p>to compress the data before encoding it and then making the output have newline characters.</p>
+ * <p>Also...</p>
+ * <code>String encoded = Base64.encodeBytes( crazyString.getBytes() );</code>
+ *
+ *
+ *
+ * <p>
+ * Change Log:
+ * </p>
+ * <ul>
+ * <li>v2.3.7 - Fixed subtle bug when base 64 input stream contained the
+ * value 01111111, which is an invalid base 64 character but should not
+ * throw an ArrayIndexOutOfBoundsException either. Led to discovery of
+ * mishandling (or potential for better handling) of other bad input
+ * characters. You should now get an IOException if you try decoding
+ * something that has bad characters in it.</li>
+ * <li>v2.3.6 - Fixed bug when breaking lines and the final byte of the encoded
+ * string ended in the last column; the buffer was not properly shrunk and
+ * contained an extra (null) byte that made it into the string.</li>
+ * <li>v2.3.5 - Fixed bug in {@link #encodeFromFile} where estimated buffer size
+ * was wrong for files of size 31, 34, and 37 bytes.</li>
+ * <li>v2.3.4 - Fixed bug when working with gzipped streams whereby flushing
+ * the Base64.OutputStream closed the Base64 encoding (by padding with equals
+ * signs) too soon. Also added an option to suppress the automatic decoding
+ * of gzipped streams. Also added experimental support for specifying a
+ * class loader when using the
+ * {@link #decodeToObject(java.lang.String, int, java.lang.ClassLoader)}
+ * method.</li>
+ * <li>v2.3.3 - Changed default char encoding to US-ASCII which reduces the internal Java
+ * footprint with its CharEncoders and so forth. Fixed some javadocs that were
+ * inconsistent. Removed imports and specified things like java.io.IOException
+ * explicitly inline.</li>
+ * <li>v2.3.2 - Reduced memory footprint! Finally refined the "guessing" of how big the
+ * final encoded data will be so that the code doesn't have to create two output
+ * arrays: an oversized initial one and then a final, exact-sized one. Big win
+ * when using the {@link #encodeBytesToBytes(byte[])} family of methods (and not
+ * using the gzip options which uses a different mechanism with streams and stuff).</li>
+ * <li>v2.3.1 - Added {@link #encodeBytesToBytes(byte[], int, int, int)} and some
+ * similar helper methods to be more efficient with memory by not returning a
+ * String but just a byte array.</li>
+ * <li>v2.3 - <strong>This is not a drop-in replacement!</strong> This is two years of comments
+ * and bug fixes queued up and finally executed. Thanks to everyone who sent
+ * me stuff, and I'm sorry I wasn't able to distribute your fixes to everyone else.
+ * Much bad coding was cleaned up including throwing exceptions where necessary
+ * instead of returning null values or something similar. Here are some changes
+ * that may affect you:
+ * <ul>
+ * <li><em>Does not break lines, by default.</em> This is to keep in compliance with
+ * <a href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>.</li>
+ * <li><em>Throws exceptions instead of returning null values.</em> Because some operations
+ * (especially those that may permit the GZIP option) use IO streams, there
+ * is a possiblity of an java.io.IOException being thrown. After some discussion and
+ * thought, I've changed the behavior of the methods to throw java.io.IOExceptions
+ * rather than return null if ever there's an error. I think this is more
+ * appropriate, though it will require some changes to your code. Sorry,
+ * it should have been done this way to begin with.</li>
+ * <li><em>Removed all references to System.out, System.err, and the like.</em>
+ * Shame on me. All I can say is sorry they were ever there.</li>
+ * <li><em>Throws NullPointerExceptions and IllegalArgumentExceptions</em> as needed
+ * such as when passed arrays are null or offsets are invalid.</li>
+ * <li>Cleaned up as much javadoc as I could to avoid any javadoc warnings.
+ * This was especially annoying before for people who were thorough in their
+ * own projects and then had gobs of javadoc warnings on this file.</li>
+ * </ul>
+ * <li>v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug
+ * when using very small files (~< 40 bytes).</li>
+ * <li>v2.2 - Added some helper methods for encoding/decoding directly from
+ * one file to the next. Also added a main() method to support command line
+ * encoding/decoding from one file to the next. Also added these Base64 dialects:
+ * <ol>
+ * <li>The default is RFC3548 format.</li>
+ * <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates
+ * URL and file name friendly format as described in Section 4 of RFC3548.
+ * http://www.faqs.org/rfcs/rfc3548.html</li>
+ * <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates
+ * URL and file name friendly format that preserves lexical ordering as described
+ * in http://www.faqs.org/qa/rfcc-1940.html</li>
+ * </ol>
+ * Special thanks to Jim Kellerman at <a href="http://www.powerset.com/">http://www.powerset.com/</a>
+ * for contributing the new Base64 dialects.
+ * </li>
+ *
+ * <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added
+ * some convenience methods for reading and writing to and from files.</li>
+ * <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems
+ * with other encodings (like EBCDIC).</li>
+ * <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the
+ * encoded data was a single byte.</li>
+ * <li>v2.0 - I got rid of methods that used booleans to set options.
+ * Now everything is more consolidated and cleaner. The code now detects
+ * when data that's being decoded is gzip-compressed and will decompress it
+ * automatically. Generally things are cleaner. You'll probably have to
+ * change some method calls that you were making to support the new
+ * options format (<tt>int</tt>s that you "OR" together).</li>
+ * <li>v1.5.1 - Fixed bug when decompressing and decoding to a
+ * byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.
+ * Added the ability to "suspend" encoding in the Output Stream so
+ * you can turn on and off the encoding if you need to embed base64
+ * data in an otherwise "normal" stream (like an XML file).</li>
+ * <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.
+ * This helps when using GZIP streams.
+ * Added the ability to GZip-compress objects before encoding them.</li>
+ * <li>v1.4 - Added helper methods to read/write files.</li>
+ * <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>
+ * <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream
+ * where last buffer being read, if not completely full, was not returned.</li>
+ * <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li>
+ * <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>
+ * </ul>
+ *
+ * <p>
+ * I am placing this code in the Public Domain. Do with it as you will.
+ * This software comes with no guarantees or warranties but with
+ * plenty of well-wishing instead!
+ * Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a>
+ * periodically to check for updates or to contribute improvements.
+ * </p>
+ *
+ * @author Robert Harder
+ * @author rob@iharder.net
+ * @version 2.3.7
+ */
+class Base64
+{
+
+/* ******** P U B L I C F I E L D S ******** */
+
+
+ /** No options specified. Value is zero. */
+ public final static int NO_OPTIONS = 0;
+
+ /** Specify encoding in first bit. Value is one. */
+ public final static int ENCODE = 1;
+
+
+ /** Specify decoding in first bit. Value is zero. */
+ public final static int DECODE = 0;
+
+
+ /** Specify that data should be gzip-compressed in second bit. Value is two. */
+ public final static int GZIP = 2;
+
+ /** Specify that gzipped data should <em>not</em> be automatically gunzipped. */
+ public final static int DONT_GUNZIP = 4;
+
+
+ /** Do break lines when encoding. Value is 8. */
+ public final static int DO_BREAK_LINES = 8;
+
+ /**
+ * Encode using Base64-like encoding that is URL- and Filename-safe as described
+ * in Section 4 of RFC3548:
+ * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
+ * It is important to note that data encoded this way is <em>not</em> officially valid Base64,
+ * or at the very least should not be called Base64 without also specifying that is
+ * was encoded using the URL- and Filename-safe dialect.
+ */
+ public final static int URL_SAFE = 16;
+
+
+ /**
+ * Encode using the special "ordered" dialect of Base64 described here:
+ * <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.
+ */
+ public final static int ORDERED = 32;
+
+
+/* ******** P R I V A T E F I E L D S ******** */
+
+
+ /** Maximum line length (76) of Base64 output. */
+ private final static int MAX_LINE_LENGTH = 76;
+
+
+ /** The equals sign (=) as a byte. */
+ private final static byte EQUALS_SIGN = (byte)'=';
+
+
+ /** The new line character (\n) as a byte. */
+ private final static byte NEW_LINE = (byte)'\n';
+
+
+ /** Preferred encoding. */
+ private final static String PREFERRED_ENCODING = "US-ASCII";
+
+
+ private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
+ private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding
+
+
+/* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */
+
+ /** The 64 valid Base64 values. */
+ /* Host platform me be something funny like EBCDIC, so we hardcode these values. */
+ private final static byte[] _STANDARD_ALPHABET = {
+ (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
+ (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
+ (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
+ (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
+ (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
+ (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
+ (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
+ (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
+ (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
+ (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'
+ };
+
+
+ /**
+ * Translates a Base64 value to either its 6-bit reconstruction value
+ * or a negative number indicating some other meaning.
+ **/
+ private final static byte[] _STANDARD_DECODABET = {
+ -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
+ -5,-5, // Whitespace: Tab and Linefeed
+ -9,-9, // Decimal 11 - 12
+ -5, // Whitespace: Carriage Return
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
+ -9,-9,-9,-9,-9, // Decimal 27 - 31
+ -5, // Whitespace: Space
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
+ 62, // Plus sign at decimal 43
+ -9,-9,-9, // Decimal 44 - 46
+ 63, // Slash at decimal 47
+ 52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
+ -9,-9,-9, // Decimal 58 - 60
+ -1, // Equals sign at decimal 61
+ -9,-9,-9, // Decimal 62 - 64
+ 0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
+ 14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
+ -9,-9,-9,-9,-9,-9, // Decimal 91 - 96
+ 26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
+ 39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
+ -9,-9,-9,-9,-9 // Decimal 123 - 127
+ ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
+ };
+
+
+/* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */
+
+ /**
+ * Used in the URL- and Filename-safe dialect described in Section 4 of RFC3548:
+ * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
+ * Notice that the last two bytes become "hyphen" and "underscore" instead of "plus" and "slash."
+ */
+ private final static byte[] _URL_SAFE_ALPHABET = {
+ (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
+ (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
+ (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
+ (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
+ (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
+ (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
+ (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
+ (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
+ (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
+ (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'-', (byte)'_'
+ };
+
+ /**
+ * Used in decoding URL- and Filename-safe dialects of Base64.
+ */
+ private final static byte[] _URL_SAFE_DECODABET = {
+ -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
+ -5,-5, // Whitespace: Tab and Linefeed
+ -9,-9, // Decimal 11 - 12
+ -5, // Whitespace: Carriage Return
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
+ -9,-9,-9,-9,-9, // Decimal 27 - 31
+ -5, // Whitespace: Space
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
+ -9, // Plus sign at decimal 43
+ -9, // Decimal 44
+ 62, // Minus sign at decimal 45
+ -9, // Decimal 46
+ -9, // Slash at decimal 47
+ 52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
+ -9,-9,-9, // Decimal 58 - 60
+ -1, // Equals sign at decimal 61
+ -9,-9,-9, // Decimal 62 - 64
+ 0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
+ 14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
+ -9,-9,-9,-9, // Decimal 91 - 94
+ 63, // Underscore at decimal 95
+ -9, // Decimal 96
+ 26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
+ 39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
+ -9,-9,-9,-9,-9 // Decimal 123 - 127
+ ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
+ };
+
+
+
+/* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */
+
+ /**
+ * I don't get the point of this technique, but someone requested it,
+ * and it is described here:
+ * <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.
+ */
+ private final static byte[] _ORDERED_ALPHABET = {
+ (byte)'-',
+ (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',
+ (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9',
+ (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
+ (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
+ (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
+ (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
+ (byte)'_',
+ (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
+ (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
+ (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
+ (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z'
+ };
+
+ /**
+ * Used in decoding the "ordered" dialect of Base64.
+ */
+ private final static byte[] _ORDERED_DECODABET = {
+ -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
+ -5,-5, // Whitespace: Tab and Linefeed
+ -9,-9, // Decimal 11 - 12
+ -5, // Whitespace: Carriage Return
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
+ -9,-9,-9,-9,-9, // Decimal 27 - 31
+ -5, // Whitespace: Space
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
+ -9, // Plus sign at decimal 43
+ -9, // Decimal 44
+ 0, // Minus sign at decimal 45
+ -9, // Decimal 46
+ -9, // Slash at decimal 47
+ 1,2,3,4,5,6,7,8,9,10, // Numbers zero through nine
+ -9,-9,-9, // Decimal 58 - 60
+ -1, // Equals sign at decimal 61
+ -9,-9,-9, // Decimal 62 - 64
+ 11,12,13,14,15,16,17,18,19,20,21,22,23, // Letters 'A' through 'M'
+ 24,25,26,27,28,29,30,31,32,33,34,35,36, // Letters 'N' through 'Z'
+ -9,-9,-9,-9, // Decimal 91 - 94
+ 37, // Underscore at decimal 95
+ -9, // Decimal 96
+ 38,39,40,41,42,43,44,45,46,47,48,49,50, // Letters 'a' through 'm'
+ 51,52,53,54,55,56,57,58,59,60,61,62,63, // Letters 'n' through 'z'
+ -9,-9,-9,-9,-9 // Decimal 123 - 127
+ ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
+ -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
+ };
+
+
+/* ******** D E T E R M I N E W H I C H A L H A B E T ******** */
+
+
+ /**
+ * Returns one of the _SOMETHING_ALPHABET byte arrays depending on
+ * the options specified.
+ * It's possible, though silly, to specify ORDERED <b>and</b> URLSAFE
+ * in which case one of them will be picked, though there is
+ * no guarantee as to which one will be picked.
+ */
+ private final static byte[] getAlphabet( int options ) {
+ if ((options & URL_SAFE) == URL_SAFE) {
+ return _URL_SAFE_ALPHABET;
+ } else if ((options & ORDERED) == ORDERED) {
+ return _ORDERED_ALPHABET;
+ } else {
+ return _STANDARD_ALPHABET;
+ }
+ } // end getAlphabet
+
+
+ /**
+ * Returns one of the _SOMETHING_DECODABET byte arrays depending on
+ * the options specified.
+ * It's possible, though silly, to specify ORDERED and URL_SAFE
+ * in which case one of them will be picked, though there is
+ * no guarantee as to which one will be picked.
+ */
+ private final static byte[] getDecodabet( int options ) {
+ if( (options & URL_SAFE) == URL_SAFE) {
+ return _URL_SAFE_DECODABET;
+ } else if ((options & ORDERED) == ORDERED) {
+ return _ORDERED_DECODABET;
+ } else {
+ return _STANDARD_DECODABET;
+ }
+ } // end getAlphabet
+
+
+
+ /** Defeats instantiation. */
+ private Base64(){}
+
+
+
+
+/* ******** E N C O D I N G M E T H O D S ******** */
+
+
+ /**
+ * Encodes up to the first three bytes of array <var>threeBytes</var>
+ * and returns a four-byte array in Base64 notation.
+ * The actual number of significant bytes in your array is
+ * given by <var>numSigBytes</var>.
+ * The array <var>threeBytes</var> needs only be as big as
+ * <var>numSigBytes</var>.
+ * Code can reuse a byte array by passing a four-byte array as <var>b4</var>.
+ *
+ * @param b4 A reusable byte array to reduce array instantiation
+ * @param threeBytes the array to convert
+ * @param numSigBytes the number of significant bytes in your array
+ * @return four byte array in Base64 notation.
+ * @since 1.5.1
+ */
+ private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes, int options ) {
+ encode3to4( threeBytes, 0, numSigBytes, b4, 0, options );
+ return b4;
+ } // end encode3to4
+
+
+ /**
+ * <p>Encodes up to three bytes of the array <var>source</var>
+ * and writes the resulting four Base64 bytes to <var>destination</var>.
+ * The source and destination arrays can be manipulated
+ * anywhere along their length by specifying
+ * <var>srcOffset</var> and <var>destOffset</var>.
+ * This method does not check to make sure your arrays
+ * are large enough to accomodate <var>srcOffset</var> + 3 for
+ * the <var>source</var> array or <var>destOffset</var> + 4 for
+ * the <var>destination</var> array.
+ * The actual number of significant bytes in your array is
+ * given by <var>numSigBytes</var>.</p>
+ * <p>This is the lowest level of the encoding methods with
+ * all possible parameters.</p>
+ *
+ * @param source the array to convert
+ * @param srcOffset the index where conversion begins
+ * @param numSigBytes the number of significant bytes in your array
+ * @param destination the array to hold the conversion
+ * @param destOffset the index where output will be put
+ * @return the <var>destination</var> array
+ * @since 1.3
+ */
+ private static byte[] encode3to4(
+ byte[] source, int srcOffset, int numSigBytes,
+ byte[] destination, int destOffset, int options ) {
+
+ byte[] ALPHABET = getAlphabet( options );
+
+ // 1 2 3
+ // 01234567890123456789012345678901 Bit position
+ // --------000000001111111122222222 Array position from threeBytes
+ // --------| || || || | Six bit groups to index ALPHABET
+ // >>18 >>12 >> 6 >> 0 Right shift necessary
+ // 0x3f 0x3f 0x3f Additional AND
+
+ // Create buffer with zero-padding if there are only one or two
+ // significant bytes passed in the array.
+ // We have to shift left 24 in order to flush out the 1's that appear
+ // when Java treats a value as negative that is cast from a byte to an int.
+ int inBuff = ( numSigBytes > 0 ? ((source[ srcOffset ] << 24) >>> 8) : 0 )
+ | ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 )
+ | ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 );
+
+ switch( numSigBytes )
+ {
+ case 3:
+ destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
+ destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
+ destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];
+ destination[ destOffset + 3 ] = ALPHABET[ (inBuff ) & 0x3f ];
+ return destination;
+
+ case 2:
+ destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
+ destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
+ destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];
+ destination[ destOffset + 3 ] = EQUALS_SIGN;
+ return destination;
+
+ case 1:
+ destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
+ destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
+ destination[ destOffset + 2 ] = EQUALS_SIGN;
+ destination[ destOffset + 3 ] = EQUALS_SIGN;
+ return destination;
+
+ default:
+ return destination;
+ } // end switch
+ } // end encode3to4
+
+
+
+ /**
+ * Performs Base64 encoding on the <code>raw</code> ByteBuffer,
+ * writing it to the <code>encoded</code> ByteBuffer.
+ * This is an experimental feature. Currently it does not
+ * pass along any options (such as {@link #DO_BREAK_LINES}
+ * or {@link #GZIP}.
+ *
+ * @param raw input buffer
+ * @param encoded output buffer
+ * @since 2.3
+ */
+ public static void encode( java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded ){
+ byte[] raw3 = new byte[3];
+ byte[] enc4 = new byte[4];
+
+ while( raw.hasRemaining() ){
+ int rem = Math.min(3,raw.remaining());
+ raw.get(raw3,0,rem);
+ Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );
+ encoded.put(enc4);
+ } // end input remaining
+ }
+
+
+ /**
+ * Performs Base64 encoding on the <code>raw</code> ByteBuffer,
+ * writing it to the <code>encoded</code> CharBuffer.
+ * This is an experimental feature. Currently it does not
+ * pass along any options (such as {@link #DO_BREAK_LINES}
+ * or {@link #GZIP}.
+ *
+ * @param raw input buffer
+ * @param encoded output buffer
+ * @since 2.3
+ */
+ public static void encode( java.nio.ByteBuffer raw, java.nio.CharBuffer encoded ){
+ byte[] raw3 = new byte[3];
+ byte[] enc4 = new byte[4];
+
+ while( raw.hasRemaining() ){
+ int rem = Math.min(3,raw.remaining());
+ raw.get(raw3,0,rem);
+ Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );
+ for( int i = 0; i < 4; i++ ){
+ encoded.put( (char)(enc4[i] & 0xFF) );
+ }
+ } // end input remaining
+ }
+
+
+
+
+ /**
+ * Serializes an object and returns the Base64-encoded
+ * version of that serialized object.
+ *
+ * <p>As of v 2.3, if the object
+ * cannot be serialized or there is another error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned a null value, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * The object is not GZip-compressed before being encoded.
+ *
+ * @param serializableObject The object to encode
+ * @return The Base64-encoded object
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if serializedObject is null
+ * @since 1.4
+ */
+ public static String encodeObject( java.io.Serializable serializableObject )
+ throws java.io.IOException {
+ return encodeObject( serializableObject, NO_OPTIONS );
+ } // end encodeObject
+
+
+
+ /**
+ * Serializes an object and returns the Base64-encoded
+ * version of that serialized object.
+ *
+ * <p>As of v 2.3, if the object
+ * cannot be serialized or there is another error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned a null value, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * The object is not GZip-compressed before being encoded.
+ * <p>
+ * Example options:<pre>
+ * GZIP: gzip-compresses object before encoding it.
+ * DO_BREAK_LINES: break lines at 76 characters
+ * </pre>
+ * <p>
+ * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or
+ * <p>
+ * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )</code>
+ *
+ * @param serializableObject The object to encode
+ * @param options Specified options
+ * @return The Base64-encoded object
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @throws java.io.IOException if there is an error
+ * @since 2.0
+ */
+ public static String encodeObject( java.io.Serializable serializableObject, int options )
+ throws java.io.IOException {
+
+ if( serializableObject == null ){
+ throw new NullPointerException( "Cannot serialize a null object." );
+ } // end if: null
+
+ // Streams
+ java.io.ByteArrayOutputStream baos = null;
+ java.io.OutputStream b64os = null;
+ java.util.zip.GZIPOutputStream gzos = null;
+ java.io.ObjectOutputStream oos = null;
+
+
+ try {
+ // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
+ baos = new java.io.ByteArrayOutputStream();
+ b64os = new Base64.OutputStream( baos, ENCODE | options );
+ if( (options & GZIP) != 0 ){
+ // Gzip
+ gzos = new java.util.zip.GZIPOutputStream(b64os);
+ oos = new java.io.ObjectOutputStream( gzos );
+ } else {
+ // Not gzipped
+ oos = new java.io.ObjectOutputStream( b64os );
+ }
+ oos.writeObject( serializableObject );
+ } // end try
+ catch( java.io.IOException e ) {
+ // Catch it and then throw it immediately so that
+ // the finally{} block is called for cleanup.
+ throw e;
+ } // end catch
+ finally {
+ try{ oos.close(); } catch( Exception e ){}
+ try{ gzos.close(); } catch( Exception e ){}
+ try{ b64os.close(); } catch( Exception e ){}
+ try{ baos.close(); } catch( Exception e ){}
+ } // end finally
+
+ // Return value according to relevant encoding.
+ try {
+ return new String( baos.toByteArray(), PREFERRED_ENCODING );
+ } // end try
+ catch (java.io.UnsupportedEncodingException uue){
+ // Fall back to some Java default
+ return new String( baos.toByteArray() );
+ } // end catch
+
+ } // end encode
+
+
+
+ /**
+ * Encodes a byte array into Base64 notation.
+ * Does not GZip-compress data.
+ *
+ * @param source The data to convert
+ * @return The data in Base64-encoded form
+ * @throws NullPointerException if source array is null
+ * @since 1.4
+ */
+ public static String encodeBytes( byte[] source ) {
+ // Since we're not going to have the GZIP encoding turned on,
+ // we're not going to have an java.io.IOException thrown, so
+ // we should not force the user to have to catch it.
+ String encoded = null;
+ try {
+ encoded = encodeBytes(source, 0, source.length, NO_OPTIONS);
+ } catch (java.io.IOException ex) {
+ assert false : ex.getMessage();
+ } // end catch
+ assert encoded != null;
+ return encoded;
+ } // end encodeBytes
+
+
+
+ /**
+ * Encodes a byte array into Base64 notation.
+ * <p>
+ * Example options:<pre>
+ * GZIP: gzip-compresses object before encoding it.
+ * DO_BREAK_LINES: break lines at 76 characters
+ * <i>Note: Technically, this makes your encoding non-compliant.</i>
+ * </pre>
+ * <p>
+ * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
+ * <p>
+ * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code>
+ *
+ *
+ * <p>As of v 2.3, if there is an error with the GZIP stream,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned a null value, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ *
+ * @param source The data to convert
+ * @param options Specified options
+ * @return The Base64-encoded data as a String
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if source array is null
+ * @since 2.0
+ */
+ public static String encodeBytes( byte[] source, int options ) throws java.io.IOException {
+ return encodeBytes( source, 0, source.length, options );
+ } // end encodeBytes
+
+
+ /**
+ * Encodes a byte array into Base64 notation.
+ * Does not GZip-compress data.
+ *
+ * <p>As of v 2.3, if there is an error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned a null value, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ *
+ * @param source The data to convert
+ * @param off Offset in array where conversion should begin
+ * @param len Length of data to convert
+ * @return The Base64-encoded data as a String
+ * @throws NullPointerException if source array is null
+ * @throws IllegalArgumentException if source array, offset, or length are invalid
+ * @since 1.4
+ */
+ public static String encodeBytes( byte[] source, int off, int len ) {
+ // Since we're not going to have the GZIP encoding turned on,
+ // we're not going to have an java.io.IOException thrown, so
+ // we should not force the user to have to catch it.
+ String encoded = null;
+ try {
+ encoded = encodeBytes( source, off, len, NO_OPTIONS );
+ } catch (java.io.IOException ex) {
+ assert false : ex.getMessage();
+ } // end catch
+ assert encoded != null;
+ return encoded;
+ } // end encodeBytes
+
+
+
+ /**
+ * Encodes a byte array into Base64 notation.
+ * <p>
+ * Example options:<pre>
+ * GZIP: gzip-compresses object before encoding it.
+ * DO_BREAK_LINES: break lines at 76 characters
+ * <i>Note: Technically, this makes your encoding non-compliant.</i>
+ * </pre>
+ * <p>
+ * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
+ * <p>
+ * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code>
+ *
+ *
+ * <p>As of v 2.3, if there is an error with the GZIP stream,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned a null value, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ *
+ * @param source The data to convert
+ * @param off Offset in array where conversion should begin
+ * @param len Length of data to convert
+ * @param options Specified options
+ * @return The Base64-encoded data as a String
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if source array is null
+ * @throws IllegalArgumentException if source array, offset, or length are invalid
+ * @since 2.0
+ */
+ public static String encodeBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {
+ byte[] encoded = encodeBytesToBytes( source, off, len, options );
+
+ // Return value according to relevant encoding.
+ try {
+ return new String( encoded, PREFERRED_ENCODING );
+ } // end try
+ catch (java.io.UnsupportedEncodingException uue) {
+ return new String( encoded );
+ } // end catch
+
+ } // end encodeBytes
+
+
+
+
+ /**
+ * Similar to {@link #encodeBytes(byte[])} but returns
+ * a byte array instead of instantiating a String. This is more efficient
+ * if you're working with I/O streams and have large data sets to encode.
+ *
+ *
+ * @param source The data to convert
+ * @return The Base64-encoded data as a byte[] (of ASCII characters)
+ * @throws NullPointerException if source array is null
+ * @since 2.3.1
+ */
+ public static byte[] encodeBytesToBytes( byte[] source ) {
+ byte[] encoded = null;
+ try {
+ encoded = encodeBytesToBytes( source, 0, source.length, Base64.NO_OPTIONS );
+ } catch( java.io.IOException ex ) {
+ assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();
+ }
+ return encoded;
+ }
+
+
+ /**
+ * Similar to {@link #encodeBytes(byte[], int, int, int)} but returns
+ * a byte array instead of instantiating a String. This is more efficient
+ * if you're working with I/O streams and have large data sets to encode.
+ *
+ *
+ * @param source The data to convert
+ * @param off Offset in array where conversion should begin
+ * @param len Length of data to convert
+ * @param options Specified options
+ * @return The Base64-encoded data as a String
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if source array is null
+ * @throws IllegalArgumentException if source array, offset, or length are invalid
+ * @since 2.3.1
+ */
+ public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {
+
+ if( source == null ){
+ throw new NullPointerException( "Cannot serialize a null array." );
+ } // end if: null
+
+ if( off < 0 ){
+ throw new IllegalArgumentException( "Cannot have negative offset: " + off );
+ } // end if: off < 0
+
+ if( len < 0 ){
+ throw new IllegalArgumentException( "Cannot have length offset: " + len );
+ } // end if: len < 0
+
+ if( off + len > source.length ){
+ throw new IllegalArgumentException(
+ String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));
+ } // end if: off < 0
+
+
+
+ // Compress?
+ if( (options & GZIP) != 0 ) {
+ java.io.ByteArrayOutputStream baos = null;
+ java.util.zip.GZIPOutputStream gzos = null;
+ Base64.OutputStream b64os = null;
+
+ try {
+ // GZip -> Base64 -> ByteArray
+ baos = new java.io.ByteArrayOutputStream();
+ b64os = new Base64.OutputStream( baos, ENCODE | options );
+ gzos = new java.util.zip.GZIPOutputStream( b64os );
+
+ gzos.write( source, off, len );
+ gzos.close();
+ } // end try
+ catch( java.io.IOException e ) {
+ // Catch it and then throw it immediately so that
+ // the finally{} block is called for cleanup.
+ throw e;
+ } // end catch
+ finally {
+ try{ gzos.close(); } catch( Exception e ){}
+ try{ b64os.close(); } catch( Exception e ){}
+ try{ baos.close(); } catch( Exception e ){}
+ } // end finally
+
+ return baos.toByteArray();
+ } // end if: compress
+
+ // Else, don't compress. Better not to use streams at all then.
+ else {
+ boolean breakLines = (options & DO_BREAK_LINES) != 0;
+
+ //int len43 = len * 4 / 3;
+ //byte[] outBuff = new byte[ ( len43 ) // Main 4:3
+ // + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding
+ // + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines
+ // Try to determine more precisely how big the array needs to be.
+ // If we get it right, we don't have to do an array copy, and
+ // we save a bunch of memory.
+ int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encoding
+ if( breakLines ){
+ encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters
+ }
+ byte[] outBuff = new byte[ encLen ];
+
+
+ int d = 0;
+ int e = 0;
+ int len2 = len - 2;
+ int lineLength = 0;
+ for( ; d < len2; d+=3, e+=4 ) {
+ encode3to4( source, d+off, 3, outBuff, e, options );
+
+ lineLength += 4;
+ if( breakLines && lineLength >= MAX_LINE_LENGTH )
+ {
+ outBuff[e+4] = NEW_LINE;
+ e++;
+ lineLength = 0;
+ } // end if: end of line
+ } // en dfor: each piece of array
+
+ if( d < len ) {
+ encode3to4( source, d+off, len - d, outBuff, e, options );
+ e += 4;
+ } // end if: some padding needed
+
+
+ // Only resize array if we didn't guess it right.
+ if( e <= outBuff.length - 1 ){
+ // If breaking lines and the last byte falls right at
+ // the line length (76 bytes per line), there will be
+ // one extra byte, and the array will need to be resized.
+ // Not too bad of an estimate on array size, I'd say.
+ byte[] finalOut = new byte[e];
+ System.arraycopy(outBuff,0, finalOut,0,e);
+ //System.err.println("Having to resize array from " + outBuff.length + " to " + e );
+ return finalOut;
+ } else {
+ //System.err.println("No need to resize array.");
+ return outBuff;
+ }
+
+ } // end else: don't compress
+
+ } // end encodeBytesToBytes
+
+
+
+
+
+/* ******** D E C O D I N G M E T H O D S ******** */
+
+
+ /**
+ * Decodes four bytes from array <var>source</var>
+ * and writes the resulting bytes (up to three of them)
+ * to <var>destination</var>.
+ * The source and destination arrays can be manipulated
+ * anywhere along their length by specifying
+ * <var>srcOffset</var> and <var>destOffset</var>.
+ * This method does not check to make sure your arrays
+ * are large enough to accomodate <var>srcOffset</var> + 4 for
+ * the <var>source</var> array or <var>destOffset</var> + 3 for
+ * the <var>destination</var> array.
+ * This method returns the actual number of bytes that
+ * were converted from the Base64 encoding.
+ * <p>This is the lowest level of the decoding methods with
+ * all possible parameters.</p>
+ *
+ *
+ * @param source the array to convert
+ * @param srcOffset the index where conversion begins
+ * @param destination the array to hold the conversion
+ * @param destOffset the index where output will be put
+ * @param options alphabet type is pulled from this (standard, url-safe, ordered)
+ * @return the number of decoded bytes converted
+ * @throws NullPointerException if source or destination arrays are null
+ * @throws IllegalArgumentException if srcOffset or destOffset are invalid
+ * or there is not enough room in the array.
+ * @since 1.3
+ */
+ private static int decode4to3(
+ byte[] source, int srcOffset,
+ byte[] destination, int destOffset, int options ) {
+
+ // Lots of error checking and exception throwing
+ if( source == null ){
+ throw new NullPointerException( "Source array was null." );
+ } // end if
+ if( destination == null ){
+ throw new NullPointerException( "Destination array was null." );
+ } // end if
+ if( srcOffset < 0 || srcOffset + 3 >= source.length ){
+ throw new IllegalArgumentException( String.format(
+ "Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset ) );
+ } // end if
+ if( destOffset < 0 || destOffset +2 >= destination.length ){
+ throw new IllegalArgumentException( String.format(
+ "Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset ) );
+ } // end if
+
+
+ byte[] DECODABET = getDecodabet( options );
+
+ // Example: Dk==
+ if( source[ srcOffset + 2] == EQUALS_SIGN ) {
+ // Two ways to do the same thing. Don't know which way I like best.
+ //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
+ // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
+ int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
+ | ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 );
+
+ destination[ destOffset ] = (byte)( outBuff >>> 16 );
+ return 1;
+ }
+
+ // Example: DkL=
+ else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) {
+ // Two ways to do the same thing. Don't know which way I like best.
+ //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
+ // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
+ // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
+ int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
+ | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
+ | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6 );
+
+ destination[ destOffset ] = (byte)( outBuff >>> 16 );
+ destination[ destOffset + 1 ] = (byte)( outBuff >>> 8 );
+ return 2;
+ }
+
+ // Example: DkLE
+ else {
+ // Two ways to do the same thing. Don't know which way I like best.
+ //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
+ // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
+ // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
+ // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
+ int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
+ | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
+ | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6)
+ | ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF ) );
+
+
+ destination[ destOffset ] = (byte)( outBuff >> 16 );
+ destination[ destOffset + 1 ] = (byte)( outBuff >> 8 );
+ destination[ destOffset + 2 ] = (byte)( outBuff );
+
+ return 3;
+ }
+ } // end decodeToBytes
+
+
+
+
+
+ /**
+ * Low-level access to decoding ASCII characters in
+ * the form of a byte array. <strong>Ignores GUNZIP option, if
+ * it's set.</strong> This is not generally a recommended method,
+ * although it is used internally as part of the decoding process.
+ * Special case: if len = 0, an empty array is returned. Still,
+ * if you need more speed and reduced memory footprint (and aren't
+ * gzipping), consider this method.
+ *
+ * @param source The Base64 encoded data
+ * @return decoded data
+ * @since 2.3.1
+ */
+ public static byte[] decode( byte[] source )
+ throws java.io.IOException {
+ byte[] decoded = null;
+// try {
+ decoded = decode( source, 0, source.length, Base64.NO_OPTIONS );
+// } catch( java.io.IOException ex ) {
+// assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();
+// }
+ return decoded;
+ }
+
+
+
+ /**
+ * Low-level access to decoding ASCII characters in
+ * the form of a byte array. <strong>Ignores GUNZIP option, if
+ * it's set.</strong> This is not generally a recommended method,
+ * although it is used internally as part of the decoding process.
+ * Special case: if len = 0, an empty array is returned. Still,
+ * if you need more speed and reduced memory footprint (and aren't
+ * gzipping), consider this method.
+ *
+ * @param source The Base64 encoded data
+ * @param off The offset of where to begin decoding
+ * @param len The length of characters to decode
+ * @param options Can specify options such as alphabet type to use
+ * @return decoded data
+ * @throws java.io.IOException If bogus characters exist in source data
+ * @since 1.3
+ */
+ public static byte[] decode( byte[] source, int off, int len, int options )
+ throws java.io.IOException {
+
+ // Lots of error checking and exception throwing
+ if( source == null ){
+ throw new NullPointerException( "Cannot decode null source array." );
+ } // end if
+ if( off < 0 || off + len > source.length ){
+ throw new IllegalArgumentException( String.format(
+ "Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len ) );
+ } // end if
+
+ if( len == 0 ){
+ return new byte[0];
+ }else if( len < 4 ){
+ throw new IllegalArgumentException(
+ "Base64-encoded string must have at least four characters, but length specified was " + len );
+ } // end if
+
+ byte[] DECODABET = getDecodabet( options );
+
+ int len34 = len * 3 / 4; // Estimate on array size
+ byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output
+ int outBuffPosn = 0; // Keep track of where we're writing
+
+ byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating white space
+ int b4Posn = 0; // Keep track of four byte input buffer
+ int i = 0; // Source array counter
+ byte sbiDecode = 0; // Special value from DECODABET
+
+ for( i = off; i < off+len; i++ ) { // Loop through source
+
+ sbiDecode = DECODABET[ source[i]&0xFF ];
+
+ // White space, Equals sign, or legit Base64 character
+ // Note the values such as -5 and -9 in the
+ // DECODABETs at the top of the file.
+ if( sbiDecode >= WHITE_SPACE_ENC ) {
+ if( sbiDecode >= EQUALS_SIGN_ENC ) {
+ b4[ b4Posn++ ] = source[i]; // Save non-whitespace
+ if( b4Posn > 3 ) { // Time to decode?
+ outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn, options );
+ b4Posn = 0;
+
+ // If that was the equals sign, break out of 'for' loop
+ if( source[i] == EQUALS_SIGN ) {
+ break;
+ } // end if: equals sign
+ } // end if: quartet built
+ } // end if: equals sign or better
+ } // end if: white space, equals sign or better
+ else {
+ // There's a bad input character in the Base64 stream.
+ throw new java.io.IOException( String.format(
+ "Bad Base64 input character decimal %d in array position %d", ((int)source[i])&0xFF, i ) );
+ } // end else:
+ } // each input character
+
+ byte[] out = new byte[ outBuffPosn ];
+ System.arraycopy( outBuff, 0, out, 0, outBuffPosn );
+ return out;
+ } // end decode
+
+
+
+
+ /**
+ * Decodes data from Base64 notation, automatically
+ * detecting gzip-compressed data and decompressing it.
+ *
+ * @param s the string to decode
+ * @return the decoded data
+ * @throws java.io.IOException If there is a problem
+ * @since 1.4
+ */
+ public static byte[] decode( String s ) throws java.io.IOException {
+ return decode( s, NO_OPTIONS );
+ }
+
+
+
+ /**
+ * Decodes data from Base64 notation, automatically
+ * detecting gzip-compressed data and decompressing it.
+ *
+ * @param s the string to decode
+ * @param options encode options such as URL_SAFE
+ * @return the decoded data
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if <tt>s</tt> is null
+ * @since 1.4
+ */
+ public static byte[] decode( String s, int options ) throws java.io.IOException {
+
+ if( s == null ){
+ throw new NullPointerException( "Input string was null." );
+ } // end if
+
+ byte[] bytes;
+ try {
+ bytes = s.getBytes( PREFERRED_ENCODING );
+ } // end try
+ catch( java.io.UnsupportedEncodingException uee ) {
+ bytes = s.getBytes();
+ } // end catch
+ //</change>
+
+ // Decode
+ bytes = decode( bytes, 0, bytes.length, options );
+
+ // Check to see if it's gzip-compressed
+ // GZIP Magic Two-Byte Number: 0x8b1f (35615)
+ boolean dontGunzip = (options & DONT_GUNZIP) != 0;
+ if( (bytes != null) && (bytes.length >= 4) && (!dontGunzip) ) {
+
+ int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
+ if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head ) {
+ java.io.ByteArrayInputStream bais = null;
+ java.util.zip.GZIPInputStream gzis = null;
+ java.io.ByteArrayOutputStream baos = null;
+ byte[] buffer = new byte[2048];
+ int length = 0;
+
+ try {
+ baos = new java.io.ByteArrayOutputStream();
+ bais = new java.io.ByteArrayInputStream( bytes );
+ gzis = new java.util.zip.GZIPInputStream( bais );
+
+ while( ( length = gzis.read( buffer ) ) >= 0 ) {
+ baos.write(buffer,0,length);
+ } // end while: reading input
+
+ // No error? Get new bytes.
+ bytes = baos.toByteArray();
+
+ } // end try
+ catch( java.io.IOException e ) {
+ e.printStackTrace();
+ // Just return originally-decoded bytes
+ } // end catch
+ finally {
+ try{ baos.close(); } catch( Exception e ){}
+ try{ gzis.close(); } catch( Exception e ){}
+ try{ bais.close(); } catch( Exception e ){}
+ } // end finally
+
+ } // end if: gzipped
+ } // end if: bytes.length >= 2
+
+ return bytes;
+ } // end decode
+
+
+
+ /**
+ * Attempts to decode Base64 data and deserialize a Java
+ * Object within. Returns <tt>null</tt> if there was an error.
+ *
+ * @param encodedObject The Base64 data to decode
+ * @return The decoded and deserialized object
+ * @throws NullPointerException if encodedObject is null
+ * @throws java.io.IOException if there is a general error
+ * @throws ClassNotFoundException if the decoded object is of a
+ * class that cannot be found by the JVM
+ * @since 1.5
+ */
+ public static Object decodeToObject( String encodedObject )
+ throws java.io.IOException, java.lang.ClassNotFoundException {
+ return decodeToObject(encodedObject,NO_OPTIONS,null);
+ }
+
+
+ /**
+ * Attempts to decode Base64 data and deserialize a Java
+ * Object within. Returns <tt>null</tt> if there was an error.
+ * If <tt>loader</tt> is not null, it will be the class loader
+ * used when deserializing.
+ *
+ * @param encodedObject The Base64 data to decode
+ * @param options Various parameters related to decoding
+ * @param loader Optional class loader to use in deserializing classes.
+ * @return The decoded and deserialized object
+ * @throws NullPointerException if encodedObject is null
+ * @throws java.io.IOException if there is a general error
+ * @throws ClassNotFoundException if the decoded object is of a
+ * class that cannot be found by the JVM
+ * @since 2.3.4
+ */
+ public static Object decodeToObject(
+ String encodedObject, int options, final ClassLoader loader )
+ throws java.io.IOException, java.lang.ClassNotFoundException {
+
+ // Decode and gunzip if necessary
+ byte[] objBytes = decode( encodedObject, options );
+
+ java.io.ByteArrayInputStream bais = null;
+ java.io.ObjectInputStream ois = null;
+ Object obj = null;
+
+ try {
+ bais = new java.io.ByteArrayInputStream( objBytes );
+
+ // If no custom class loader is provided, use Java's builtin OIS.
+ if( loader == null ){
+ ois = new java.io.ObjectInputStream( bais );
+ } // end if: no loader provided
+
+ // Else make a customized object input stream that uses
+ // the provided class loader.
+ else {
+ ois = new java.io.ObjectInputStream(bais){
+ @Override
+ public Class<?> resolveClass(java.io.ObjectStreamClass streamClass)
+ throws java.io.IOException, ClassNotFoundException {
+ Class c = Class.forName(streamClass.getName(), false, loader);
+ if( c == null ){
+ return super.resolveClass(streamClass);
+ } else {
+ return c; // Class loader knows of this class.
+ } // end else: not null
+ } // end resolveClass
+ }; // end ois
+ } // end else: no custom class loader
+
+ obj = ois.readObject();
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and throw in order to execute finally{}
+ } // end catch
+ catch( java.lang.ClassNotFoundException e ) {
+ throw e; // Catch and throw in order to execute finally{}
+ } // end catch
+ finally {
+ try{ bais.close(); } catch( Exception e ){}
+ try{ ois.close(); } catch( Exception e ){}
+ } // end finally
+
+ return obj;
+ } // end decodeObject
+
+
+
+ /**
+ * Convenience method for encoding data to a file.
+ *
+ * <p>As of v 2.3, if there is a error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned false, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * @param dataToEncode byte array of data to encode in base64 form
+ * @param filename Filename for saving encoded data
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if dataToEncode is null
+ * @since 2.1
+ */
+ public static void encodeToFile( byte[] dataToEncode, String filename )
+ throws java.io.IOException {
+
+ if( dataToEncode == null ){
+ throw new NullPointerException( "Data to encode was null." );
+ } // end iff
+
+ Base64.OutputStream bos = null;
+ try {
+ bos = new Base64.OutputStream(
+ new java.io.FileOutputStream( filename ), Base64.ENCODE );
+ bos.write( dataToEncode );
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and throw to execute finally{} block
+ } // end catch: java.io.IOException
+ finally {
+ try{ bos.close(); } catch( Exception e ){}
+ } // end finally
+
+ } // end encodeToFile
+
+
+ /**
+ * Convenience method for decoding data to a file.
+ *
+ * <p>As of v 2.3, if there is a error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned false, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * @param dataToDecode Base64-encoded data as a string
+ * @param filename Filename for saving decoded data
+ * @throws java.io.IOException if there is an error
+ * @since 2.1
+ */
+ public static void decodeToFile( String dataToDecode, String filename )
+ throws java.io.IOException {
+
+ Base64.OutputStream bos = null;
+ try{
+ bos = new Base64.OutputStream(
+ new java.io.FileOutputStream( filename ), Base64.DECODE );
+ bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and throw to execute finally{} block
+ } // end catch: java.io.IOException
+ finally {
+ try{ bos.close(); } catch( Exception e ){}
+ } // end finally
+
+ } // end decodeToFile
+
+
+
+
+ /**
+ * Convenience method for reading a base64-encoded
+ * file and decoding it.
+ *
+ * <p>As of v 2.3, if there is a error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned false, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * @param filename Filename for reading encoded data
+ * @return decoded byte array
+ * @throws java.io.IOException if there is an error
+ * @since 2.1
+ */
+ public static byte[] decodeFromFile( String filename )
+ throws java.io.IOException {
+
+ byte[] decodedData = null;
+ Base64.InputStream bis = null;
+ try
+ {
+ // Set up some useful variables
+ java.io.File file = new java.io.File( filename );
+ byte[] buffer = null;
+ int length = 0;
+ int numBytes = 0;
+
+ // Check for size of file
+ if( file.length() > Integer.MAX_VALUE )
+ {
+ throw new java.io.IOException( "File is too big for this convenience method (" + file.length() + " bytes)." );
+ } // end if: file too big for int index
+ buffer = new byte[ (int)file.length() ];
+
+ // Open a stream
+ bis = new Base64.InputStream(
+ new java.io.BufferedInputStream(
+ new java.io.FileInputStream( file ) ), Base64.DECODE );
+
+ // Read until done
+ while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {
+ length += numBytes;
+ } // end while
+
+ // Save in a variable to return
+ decodedData = new byte[ length ];
+ System.arraycopy( buffer, 0, decodedData, 0, length );
+
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and release to execute finally{}
+ } // end catch: java.io.IOException
+ finally {
+ try{ bis.close(); } catch( Exception e) {}
+ } // end finally
+
+ return decodedData;
+ } // end decodeFromFile
+
+
+
+ /**
+ * Convenience method for reading a binary file
+ * and base64-encoding it.
+ *
+ * <p>As of v 2.3, if there is a error,
+ * the method will throw an java.io.IOException. <b>This is new to v2.3!</b>
+ * In earlier versions, it just returned false, but
+ * in retrospect that's a pretty poor way to handle it.</p>
+ *
+ * @param filename Filename for reading binary data
+ * @return base64-encoded string
+ * @throws java.io.IOException if there is an error
+ * @since 2.1
+ */
+ public static String encodeFromFile( String filename )
+ throws java.io.IOException {
+
+ String encodedData = null;
+ Base64.InputStream bis = null;
+ try
+ {
+ // Set up some useful variables
+ java.io.File file = new java.io.File( filename );
+ byte[] buffer = new byte[ Math.max((int)(file.length() * 1.4+1),40) ]; // Need max() for math on small files (v2.2.1); Need +1 for a few corner cases (v2.3.5)
+ int length = 0;
+ int numBytes = 0;
+
+ // Open a stream
+ bis = new Base64.InputStream(
+ new java.io.BufferedInputStream(
+ new java.io.FileInputStream( file ) ), Base64.ENCODE );
+
+ // Read until done
+ while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {
+ length += numBytes;
+ } // end while
+
+ // Save in a variable to return
+ encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );
+
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and release to execute finally{}
+ } // end catch: java.io.IOException
+ finally {
+ try{ bis.close(); } catch( Exception e) {}
+ } // end finally
+
+ return encodedData;
+ } // end encodeFromFile
+
+ /**
+ * Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>.
+ *
+ * @param infile Input file
+ * @param outfile Output file
+ * @throws java.io.IOException if there is an error
+ * @since 2.2
+ */
+ public static void encodeFileToFile( String infile, String outfile )
+ throws java.io.IOException {
+
+ String encoded = Base64.encodeFromFile( infile );
+ java.io.OutputStream out = null;
+ try{
+ out = new java.io.BufferedOutputStream(
+ new java.io.FileOutputStream( outfile ) );
+ out.write( encoded.getBytes("US-ASCII") ); // Strict, 7-bit output.
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and release to execute finally{}
+ } // end catch
+ finally {
+ try { out.close(); }
+ catch( Exception ex ){}
+ } // end finally
+ } // end encodeFileToFile
+
+
+ /**
+ * Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>.
+ *
+ * @param infile Input file
+ * @param outfile Output file
+ * @throws java.io.IOException if there is an error
+ * @since 2.2
+ */
+ public static void decodeFileToFile( String infile, String outfile )
+ throws java.io.IOException {
+
+ byte[] decoded = Base64.decodeFromFile( infile );
+ java.io.OutputStream out = null;
+ try{
+ out = new java.io.BufferedOutputStream(
+ new java.io.FileOutputStream( outfile ) );
+ out.write( decoded );
+ } // end try
+ catch( java.io.IOException e ) {
+ throw e; // Catch and release to execute finally{}
+ } // end catch
+ finally {
+ try { out.close(); }
+ catch( Exception ex ){}
+ } // end finally
+ } // end decodeFileToFile
+
+
+ /* ******** I N N E R C L A S S I N P U T S T R E A M ******** */
+
+
+
+ /**
+ * A {@link Base64.InputStream} will read data from another
+ * <tt>java.io.InputStream</tt>, given in the constructor,
+ * and encode/decode to/from Base64 notation on the fly.
+ *
+ * @see Base64
+ * @since 1.3
+ */
+ public static class InputStream extends java.io.FilterInputStream {
+
+ private boolean encode; // Encoding or decoding
+ private int position; // Current position in the buffer
+ private byte[] buffer; // Small buffer holding converted data
+ private int bufferLength; // Length of buffer (3 or 4)
+ private int numSigBytes; // Number of meaningful bytes in the buffer
+ private int lineLength;
+ private boolean breakLines; // Break lines at less than 80 characters
+ private int options; // Record options used to create the stream.
+ private byte[] decodabet; // Local copies to avoid extra method calls
+
+
+ /**
+ * Constructs a {@link Base64.InputStream} in DECODE mode.
+ *
+ * @param in the <tt>java.io.InputStream</tt> from which to read data.
+ * @since 1.3
+ */
+ public InputStream( java.io.InputStream in ) {
+ this( in, DECODE );
+ } // end constructor
+
+
+ /**
+ * Constructs a {@link Base64.InputStream} in
+ * either ENCODE or DECODE mode.
+ * <p>
+ * Valid options:<pre>
+ * ENCODE or DECODE: Encode or Decode as data is read.
+ * DO_BREAK_LINES: break lines at 76 characters
+ * (only meaningful when encoding)</i>
+ * </pre>
+ * <p>
+ * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code>
+ *
+ *
+ * @param in the <tt>java.io.InputStream</tt> from which to read data.
+ * @param options Specified options
+ * @see Base64#ENCODE
+ * @see Base64#DECODE
+ * @see Base64#DO_BREAK_LINES
+ * @since 2.0
+ */
+ public InputStream( java.io.InputStream in, int options ) {
+
+ super( in );
+ this.options = options; // Record for later
+ this.breakLines = (options & DO_BREAK_LINES) > 0;
+ this.encode = (options & ENCODE) > 0;
+ this.bufferLength = encode ? 4 : 3;
+ this.buffer = new byte[ bufferLength ];
+ this.position = -1;
+ this.lineLength = 0;
+ this.decodabet = getDecodabet(options);
+ } // end constructor
+
+ /**
+ * Reads enough of the input stream to convert
+ * to/from Base64 and returns the next byte.
+ *
+ * @return next byte
+ * @since 1.3
+ */
+ @Override
+ public int read() throws java.io.IOException {
+
+ // Do we need to get data?
+ if( position < 0 ) {
+ if( encode ) {
+ byte[] b3 = new byte[3];
+ int numBinaryBytes = 0;
+ for( int i = 0; i < 3; i++ ) {
+ int b = in.read();
+
+ // If end of stream, b is -1.
+ if( b >= 0 ) {
+ b3[i] = (byte)b;
+ numBinaryBytes++;
+ } else {
+ break; // out of for loop
+ } // end else: end of stream
+
+ } // end for: each needed input byte
+
+ if( numBinaryBytes > 0 ) {
+ encode3to4( b3, 0, numBinaryBytes, buffer, 0, options );
+ position = 0;
+ numSigBytes = 4;
+ } // end if: got data
+ else {
+ return -1; // Must be end of stream
+ } // end else
+ } // end if: encoding
+
+ // Else decoding
+ else {
+ byte[] b4 = new byte[4];
+ int i = 0;
+ for( i = 0; i < 4; i++ ) {
+ // Read four "meaningful" bytes:
+ int b = 0;
+ do{ b = in.read(); }
+ while( b >= 0 && decodabet[ b & 0x7f ] <= WHITE_SPACE_ENC );
+
+ if( b < 0 ) {
+ break; // Reads a -1 if end of stream
+ } // end if: end of stream
+
+ b4[i] = (byte)b;
+ } // end for: each needed input byte
+
+ if( i == 4 ) {
+ numSigBytes = decode4to3( b4, 0, buffer, 0, options );
+ position = 0;
+ } // end if: got four characters
+ else if( i == 0 ){
+ return -1;
+ } // end else if: also padded correctly
+ else {
+ // Must have broken out from above.
+ throw new java.io.IOException( "Improperly padded Base64 input." );
+ } // end
+
+ } // end else: decode
+ } // end else: get data
+
+ // Got data?
+ if( position >= 0 ) {
+ // End of relevant data?
+ if( /*!encode &&*/ position >= numSigBytes ){
+ return -1;
+ } // end if: got data
+
+ if( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) {
+ lineLength = 0;
+ return '\n';
+ } // end if
+ else {
+ lineLength++; // This isn't important when decoding
+ // but throwing an extra "if" seems
+ // just as wasteful.
+
+ int b = buffer[ position++ ];
+
+ if( position >= bufferLength ) {
+ position = -1;
+ } // end if: end
+
+ return b & 0xFF; // This is how you "cast" a byte that's
+ // intended to be unsigned.
+ } // end else
+ } // end if: position >= 0
+
+ // Else error
+ else {
+ throw new java.io.IOException( "Error in Base64 code reading stream." );
+ } // end else
+ } // end read
+
+
+ /**
+ * Calls {@link #read()} repeatedly until the end of stream
+ * is reached or <var>len</var> bytes are read.
+ * Returns number of bytes read into array or -1 if
+ * end of stream is encountered.
+ *
+ * @param dest array to hold values
+ * @param off offset for array
+ * @param len max number of bytes to read into array
+ * @return bytes read into array or -1 if end of stream is encountered.
+ * @since 1.3
+ */
+ @Override
+ public int read( byte[] dest, int off, int len )
+ throws java.io.IOException {
+ int i;
+ int b;
+ for( i = 0; i < len; i++ ) {
+ b = read();
+
+ if( b >= 0 ) {
+ dest[off + i] = (byte) b;
+ }
+ else if( i == 0 ) {
+ return -1;
+ }
+ else {
+ break; // Out of 'for' loop
+ } // Out of 'for' loop
+ } // end for: each byte read
+ return i;
+ } // end read
+
+ } // end inner class InputStream
+
+
+
+
+
+
+ /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */
+
+
+
+ /**
+ * A {@link Base64.OutputStream} will write data to another
+ * <tt>java.io.OutputStream</tt>, given in the constructor,
+ * and encode/decode to/from Base64 notation on the fly.
+ *
+ * @see Base64
+ * @since 1.3
+ */
+ public static class OutputStream extends java.io.FilterOutputStream {
+
+ private boolean encode;
+ private int position;
+ private byte[] buffer;
+ private int bufferLength;
+ private int lineLength;
+ private boolean breakLines;
+ private byte[] b4; // Scratch used in a few places
+ private boolean suspendEncoding;
+ private int options; // Record for later
+ private byte[] decodabet; // Local copies to avoid extra method calls
+
+ /**
+ * Constructs a {@link Base64.OutputStream} in ENCODE mode.
+ *
+ * @param out the <tt>java.io.OutputStream</tt> to which data will be written.
+ * @since 1.3
+ */
+ public OutputStream( java.io.OutputStream out ) {
+ this( out, ENCODE );
+ } // end constructor
+
+
+ /**
+ * Constructs a {@link Base64.OutputStream} in
+ * either ENCODE or DECODE mode.
+ * <p>
+ * Valid options:<pre>
+ * ENCODE or DECODE: Encode or Decode as data is read.
+ * DO_BREAK_LINES: don't break lines at 76 characters
+ * (only meaningful when encoding)</i>
+ * </pre>
+ * <p>
+ * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code>
+ *
+ * @param out the <tt>java.io.OutputStream</tt> to which data will be written.
+ * @param options Specified options.
+ * @see Base64#ENCODE
+ * @see Base64#DECODE
+ * @see Base64#DO_BREAK_LINES
+ * @since 1.3
+ */
+ public OutputStream( java.io.OutputStream out, int options ) {
+ super( out );
+ this.breakLines = (options & DO_BREAK_LINES) != 0;
+ this.encode = (options & ENCODE) != 0;
+ this.bufferLength = encode ? 3 : 4;
+ this.buffer = new byte[ bufferLength ];
+ this.position = 0;
+ this.lineLength = 0;
+ this.suspendEncoding = false;
+ this.b4 = new byte[4];
+ this.options = options;
+ this.decodabet = getDecodabet(options);
+ } // end constructor
+
+
+ /**
+ * Writes the byte to the output stream after
+ * converting to/from Base64 notation.
+ * When encoding, bytes are buffered three
+ * at a time before the output stream actually
+ * gets a write() call.
+ * When decoding, bytes are buffered four
+ * at a time.
+ *
+ * @param theByte the byte to write
+ * @since 1.3
+ */
+ @Override
+ public void write(int theByte)
+ throws java.io.IOException {
+ // Encoding suspended?
+ if( suspendEncoding ) {
+ this.out.write( theByte );
+ return;
+ } // end if: supsended
+
+ // Encode?
+ if( encode ) {
+ buffer[ position++ ] = (byte)theByte;
+ if( position >= bufferLength ) { // Enough to encode.
+
+ this.out.write( encode3to4( b4, buffer, bufferLength, options ) );
+
+ lineLength += 4;
+ if( breakLines && lineLength >= MAX_LINE_LENGTH ) {
+ this.out.write( NEW_LINE );
+ lineLength = 0;
+ } // end if: end of line
+
+ position = 0;
+ } // end if: enough to output
+ } // end if: encoding
+
+ // Else, Decoding
+ else {
+ // Meaningful Base64 character?
+ if( decodabet[ theByte & 0x7f ] > WHITE_SPACE_ENC ) {
+ buffer[ position++ ] = (byte)theByte;
+ if( position >= bufferLength ) { // Enough to output.
+
+ int len = Base64.decode4to3( buffer, 0, b4, 0, options );
+ out.write( b4, 0, len );
+ position = 0;
+ } // end if: enough to output
+ } // end if: meaningful base64 character
+ else if( decodabet[ theByte & 0x7f ] != WHITE_SPACE_ENC ) {
+ throw new java.io.IOException( "Invalid character in Base64 data." );
+ } // end else: not white space either
+ } // end else: decoding
+ } // end write
+
+
+
+ /**
+ * Calls {@link #write(int)} repeatedly until <var>len</var>
+ * bytes are written.
+ *
+ * @param theBytes array from which to read bytes
+ * @param off offset for array
+ * @param len max number of bytes to read into array
+ * @since 1.3
+ */
+ @Override
+ public void write( byte[] theBytes, int off, int len )
+ throws java.io.IOException {
+ // Encoding suspended?
+ if( suspendEncoding ) {
+ this.out.write( theBytes, off, len );
+ return;
+ } // end if: supsended
+
+ for( int i = 0; i < len; i++ ) {
+ write( theBytes[ off + i ] );
+ } // end for: each byte written
+
+ } // end write
+
+
+
+ /**
+ * Method added by PHIL. [Thanks, PHIL. -Rob]
+ * This pads the buffer without closing the stream.
+ * @throws java.io.IOException if there's an error.
+ */
+ public void flushBase64() throws java.io.IOException {
+ if( position > 0 ) {
+ if( encode ) {
+ out.write( encode3to4( b4, buffer, position, options ) );
+ position = 0;
+ } // end if: encoding
+ else {
+ throw new java.io.IOException( "Base64 input not properly padded." );
+ } // end else: decoding
+ } // end if: buffer partially full
+
+ } // end flush
+
+
+ /**
+ * Flushes and closes (I think, in the superclass) the stream.
+ *
+ * @since 1.3
+ */
+ @Override
+ public void close() throws java.io.IOException {
+ // 1. Ensure that pending characters are written
+ flushBase64();
+
+ // 2. Actually close the stream
+ // Base class both flushes and closes.
+ super.close();
+
+ buffer = null;
+ out = null;
+ } // end close
+
+
+
+ /**
+ * Suspends encoding of the stream.
+ * May be helpful if you need to embed a piece of
+ * base64-encoded data in a stream.
+ *
+ * @throws java.io.IOException if there's an error flushing
+ * @since 1.5.1
+ */
+ public void suspendEncoding() throws java.io.IOException {
+ flushBase64();
+ this.suspendEncoding = true;
+ } // end suspendEncoding
+
+
+ /**
+ * Resumes encoding of the stream.
+ * May be helpful if you need to embed a piece of
+ * base64-encoded data in a stream.
+ *
+ * @since 1.5.1
+ */
+ public void resumeEncoding() {
+ this.suspendEncoding = false;
+ } // end resumeEncoding
+
+
+
+ } // end inner class OutputStream
+
+
+} // end class Base64
git://git.nikiroo.be / fanfix-jexer.git / commitdiff