--- /dev/null
+package org.asamk.signal;
+
+/**
+ * <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>v2.3.4 - 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 2.3.3
+ */
+public 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 // Decimal 123 - 126
+ /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 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 // Decimal 123 - 126
+ /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 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 // Decimal 123 - 126
+ /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 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() {
+ }
+
+
+ public static int getEncodedLengthWithoutPadding(int unencodedLength) {
+ int remainderBytes = unencodedLength % 3;
+ int paddingBytes = 0;
+
+ if (remainderBytes != 0)
+ paddingBytes = 3 - remainderBytes;
+
+ return (((int) ((unencodedLength + 2) / 3)) * 4) - paddingBytes;
+ }
+
+ public static int getEncodedBytesForTarget(int targetSize) {
+ return ((int) (targetSize * 3)) / 4;
+ }
+
+
+/* ******** 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.
+ *
+ * Example options:<pre>
+ * GZIP: gzip-compresses object before encoding it.
+ * DO_BREAK_LINES: break lines at 76 characters
+ * </pre>
+ *
+ * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or
+ *
+ * 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
+ * @throws java.io.IOException if there is an error
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @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
+
+
+ public static String encodeBytesWithoutPadding(byte[] source, int offset, int length) {
+ String encoded = null;
+
+ try {
+ encoded = encodeBytes(source, offset, length, NO_OPTIONS);
+ } catch (java.io.IOException ex) {
+ assert false : ex.getMessage();
+ }
+
+ assert encoded != null;
+
+ if (encoded.charAt(encoded.length() - 2) == '=')
+ return encoded.substring(0, encoded.length() - 2);
+ else if (encoded.charAt(encoded.length() - 1) == '=')
+ return encoded.substring(0, encoded.length() - 1);
+ else return encoded;
+
+ }
+
+ public static String encodeBytesWithoutPadding(byte[] source) {
+ return encodeBytesWithoutPadding(source, 0, source.length);
+ }
+
+
+ /**
+ * 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
+ * @throws java.io.IOException if there is an error
+ * @throws NullPointerException if source array is null
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @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
+ * @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
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @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
+ * @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
+ * @see Base64#GZIP
+ * @see Base64#DO_BREAK_LINES
+ * @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) {
+ 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) {
+ 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 sbiCrop = 0; // Low seven bits (ASCII) of input
+ byte sbiDecode = 0; // Special value from DECODABET
+
+ for (i = off; i < off + len; i++) { // Loop through source
+
+ sbiCrop = (byte) (source[i] & 0x7f); // Only the low seven bits
+ sbiDecode = DECODABET[sbiCrop]; // Special value
+
+ // 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++] = sbiCrop; // 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 (sbiCrop == 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 '%c' in array position %d", source[i], 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);
+ }
+
+
+ public static byte[] decodeWithoutPadding(String source) throws java.io.IOException {
+ int padding = source.length() % 4;
+
+ if (padding == 1) source = source + "=";
+ else if (padding == 2) source = source + "==";
+ else if (padding == 3) source = source + "=";
+
+ return decode(source);
+ }
+
+
+ /**
+ * 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), 40)]; // Need max() for math on small files (v2.2.1)
+ 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.
+ *
+ * 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>
+ *
+ * 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.
+ *
+ * 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>
+ *
+ * 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.nmode.ca / signal-cli / blobdiff
