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package org.jivesoftware.smack.util; /** * <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> * Change Log: * </p> * <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 2.2.1 */ 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. */ public final static int ENCODE = 1; /** Specify decoding. */ public final static int DECODE = 0; /** Specify that data should be gzip-compressed. */ public final static int GZIP = 2; /** Don't break lines when encoding (violates strict Base64 specification) */ public final static int DONT_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 = "UTF-8"; // I think I end up not using the BAD_ENCODING indicator. //private final static byte BAD_ENCODING = -9; // Indicates error in encoding 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. */ //private final static byte[] ALPHABET; /* 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,