mirror of
https://codeberg.org/Mercury-IM/Smack
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b907d606d9
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13459 b35dd754-fafc-0310-a699-88a17e54d16e
1773 lines
67 KiB
Java
1773 lines
67 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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*/
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package org.jivesoftware.smack.util;
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/**
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* <p>Encodes and decodes to and from Base64 notation.</p>
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* <p>Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>.</p>
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*
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* <p>
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* Change Log:
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* </p>
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* <ul>
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* <li>v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug
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* when using very small files (~< 40 bytes).</li>
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* <li>v2.2 - Added some helper methods for encoding/decoding directly from
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* one file to the next. Also added a main() method to support command line
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* encoding/decoding from one file to the next. Also added these Base64 dialects:
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* <ol>
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* <li>The default is RFC3548 format.</li>
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* <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates
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* URL and file name friendly format as described in Section 4 of RFC3548.
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* http://www.faqs.org/rfcs/rfc3548.html</li>
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* <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates
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* URL and file name friendly format that preserves lexical ordering as described
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* in http://www.faqs.org/qa/rfcc-1940.html</li>
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* </ol>
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* Special thanks to Jim Kellerman at <a href="http://www.powerset.com/">http://www.powerset.com/</a>
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* for contributing the new Base64 dialects.
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* </li>
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*
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* <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added
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* some convenience methods for reading and writing to and from files.</li>
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* <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems
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* with other encodings (like EBCDIC).</li>
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* <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the
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* encoded data was a single byte.</li>
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* <li>v2.0 - I got rid of methods that used booleans to set options.
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* Now everything is more consolidated and cleaner. The code now detects
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* when data that's being decoded is gzip-compressed and will decompress it
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* automatically. Generally things are cleaner. You'll probably have to
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* change some method calls that you were making to support the new
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* options format (<tt>int</tt>s that you "OR" together).</li>
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* <li>v1.5.1 - Fixed bug when decompressing and decoding to a
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* byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.
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* Added the ability to "suspend" encoding in the Output Stream so
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* you can turn on and off the encoding if you need to embed base64
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* data in an otherwise "normal" stream (like an XML file).</li>
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* <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.
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* This helps when using GZIP streams.
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* Added the ability to GZip-compress objects before encoding them.</li>
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* <li>v1.4 - Added helper methods to read/write files.</li>
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* <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>
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* <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream
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* where last buffer being read, if not completely full, was not returned.</li>
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* <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li>
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* <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>
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* </ul>
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*
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* <p>
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* I am placing this code in the Public Domain. Do with it as you will.
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* This software comes with no guarantees or warranties but with
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* plenty of well-wishing instead!
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* Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a>
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* periodically to check for updates or to contribute improvements.
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* </p>
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*
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* @author Robert Harder
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* @author rob@iharder.net
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* @version 2.2.1
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*/
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public class Base64
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{
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/* ******** P U B L I C F I E L D S ******** */
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/** No options specified. Value is zero. */
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public final static int NO_OPTIONS = 0;
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/** Specify encoding. */
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public final static int ENCODE = 1;
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/** Specify decoding. */
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public final static int DECODE = 0;
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/** Specify that data should be gzip-compressed. */
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public final static int GZIP = 2;
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/** Don't break lines when encoding (violates strict Base64 specification) */
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public final static int DONT_BREAK_LINES = 8;
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/**
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* Encode using Base64-like encoding that is URL- and Filename-safe as described
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* in Section 4 of RFC3548:
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* <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
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* It is important to note that data encoded this way is <em>not</em> officially valid Base64,
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* or at the very least should not be called Base64 without also specifying that is
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* was encoded using the URL- and Filename-safe dialect.
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*/
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public final static int URL_SAFE = 16;
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/**
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* Encode using the special "ordered" dialect of Base64 described here:
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* <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.
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*/
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public final static int ORDERED = 32;
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/* ******** P R I V A T E F I E L D S ******** */
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/** Maximum line length (76) of Base64 output. */
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private final static int MAX_LINE_LENGTH = 76;
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/** The equals sign (=) as a byte. */
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private final static byte EQUALS_SIGN = (byte)'=';
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/** The new line character (\n) as a byte. */
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private final static byte NEW_LINE = (byte)'\n';
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/** Preferred encoding. */
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private final static String PREFERRED_ENCODING = "UTF-8";
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// I think I end up not using the BAD_ENCODING indicator.
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//private final static byte BAD_ENCODING = -9; // Indicates error in encoding
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private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
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private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding
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/* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */
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/** The 64 valid Base64 values. */
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//private final static byte[] ALPHABET;
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/* Host platform me be something funny like EBCDIC, so we hardcode these values. */
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private final static byte[] _STANDARD_ALPHABET =
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{
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
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(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
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(byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'
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};
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/**
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* Translates a Base64 value to either its 6-bit reconstruction value
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* or a negative number indicating some other meaning.
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**/
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private final static byte[] _STANDARD_DECODABET =
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{
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-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
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-5,-5, // Whitespace: Tab and Linefeed
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-9,-9, // Decimal 11 - 12
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-5, // Whitespace: Carriage Return
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
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-9,-9,-9,-9,-9, // Decimal 27 - 31
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-5, // Whitespace: Space
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
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62, // Plus sign at decimal 43
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-9,-9,-9, // Decimal 44 - 46
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63, // Slash at decimal 47
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52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
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-9,-9,-9, // Decimal 58 - 60
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-1, // Equals sign at decimal 61
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-9,-9,-9, // Decimal 62 - 64
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0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
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14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
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-9,-9,-9,-9,-9,-9, // Decimal 91 - 96
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26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
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39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
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-9,-9,-9,-9 // Decimal 123 - 126
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/*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
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};
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/* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */
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/**
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* Used in the URL- and Filename-safe dialect described in Section 4 of RFC3548:
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* <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
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* Notice that the last two bytes become "hyphen" and "underscore" instead of "plus" and "slash."
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*/
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private final static byte[] _URL_SAFE_ALPHABET =
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{
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
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(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
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(byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'-', (byte)'_'
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};
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/**
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* Used in decoding URL- and Filename-safe dialects of Base64.
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*/
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private final static byte[] _URL_SAFE_DECODABET =
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{
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-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
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-5,-5, // Whitespace: Tab and Linefeed
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-9,-9, // Decimal 11 - 12
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-5, // Whitespace: Carriage Return
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
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-9,-9,-9,-9,-9, // Decimal 27 - 31
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-5, // Whitespace: Space
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
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-9, // Plus sign at decimal 43
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-9, // Decimal 44
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62, // Minus sign at decimal 45
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-9, // Decimal 46
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-9, // Slash at decimal 47
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52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
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-9,-9,-9, // Decimal 58 - 60
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-1, // Equals sign at decimal 61
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-9,-9,-9, // Decimal 62 - 64
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0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
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14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
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-9,-9,-9,-9, // Decimal 91 - 94
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63, // Underscore at decimal 95
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-9, // Decimal 96
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26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
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39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
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-9,-9,-9,-9 // Decimal 123 - 126
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/*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
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};
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/* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */
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/**
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* I don't get the point of this technique, but it is described here:
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* <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.
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*/
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private final static byte[] _ORDERED_ALPHABET =
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{
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(byte)'-',
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',
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(byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9',
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
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(byte)'_',
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
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(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z'
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};
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/**
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* Used in decoding the "ordered" dialect of Base64.
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*/
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private final static byte[] _ORDERED_DECODABET =
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{
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-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
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-5,-5, // Whitespace: Tab and Linefeed
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-9,-9, // Decimal 11 - 12
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-5, // Whitespace: Carriage Return
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
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-9,-9,-9,-9,-9, // Decimal 27 - 31
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-5, // Whitespace: Space
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
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-9, // Plus sign at decimal 43
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-9, // Decimal 44
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0, // Minus sign at decimal 45
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-9, // Decimal 46
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-9, // Slash at decimal 47
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1,2,3,4,5,6,7,8,9,10, // Numbers zero through nine
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-9,-9,-9, // Decimal 58 - 60
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-1, // Equals sign at decimal 61
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-9,-9,-9, // Decimal 62 - 64
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11,12,13,14,15,16,17,18,19,20,21,22,23, // Letters 'A' through 'M'
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24,25,26,27,28,29,30,31,32,33,34,35,36, // Letters 'N' through 'Z'
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-9,-9,-9,-9, // Decimal 91 - 94
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37, // Underscore at decimal 95
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-9, // Decimal 96
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38,39,40,41,42,43,44,45,46,47,48,49,50, // Letters 'a' through 'm'
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51,52,53,54,55,56,57,58,59,60,61,62,63, // Letters 'n' through 'z'
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-9,-9,-9,-9 // Decimal 123 - 126
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/*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
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-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
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};
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/* ******** D E T E R M I N E W H I C H A L H A B E T ******** */
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/**
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* Returns one of the _SOMETHING_ALPHABET byte arrays depending on
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* the options specified.
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* It's possible, though silly, to specify ORDERED and URLSAFE
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* in which case one of them will be picked, though there is
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* no guarantee as to which one will be picked.
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*/
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private final static byte[] getAlphabet( int options )
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{
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if( (options & URL_SAFE) == URL_SAFE ) return _URL_SAFE_ALPHABET;
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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(){}
|
|
|
|
|
|
/**
|
|
* Encodes or decodes two files from the command line;
|
|
* <strong>feel free to delete this method (in fact you probably should)
|
|
* if you're embedding this code into a larger program.</strong>
|
|
*/
|
|
public final static void main( String[] args )
|
|
{
|
|
if( args.length < 3 ){
|
|
usage("Not enough arguments.");
|
|
} // end if: args.length < 3
|
|
else {
|
|
String flag = args[0];
|
|
String infile = args[1];
|
|
String outfile = args[2];
|
|
if( flag.equals( "-e" ) ){
|
|
Base64.encodeFileToFile( infile, outfile );
|
|
} // end if: encode
|
|
else if( flag.equals( "-d" ) ) {
|
|
Base64.decodeFileToFile( infile, outfile );
|
|
} // end else if: decode
|
|
else {
|
|
usage( "Unknown flag: " + flag );
|
|
} // end else
|
|
} // end else
|
|
} // end main
|
|
|
|
/**
|
|
* Prints command line usage.
|
|
*
|
|
* @param msg A message to include with usage info.
|
|
*/
|
|
private final static void usage( String msg )
|
|
{
|
|
System.err.println( msg );
|
|
System.err.println( "Usage: java Base64 -e|-d inputfile outputfile" );
|
|
} // end usage
|
|
|
|
|
|
/* ******** 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
|
|
|
|
|
|
|
|
/**
|
|
* Serializes an object and returns the Base64-encoded
|
|
* version of that serialized object. If the object
|
|
* cannot be serialized or there is another error,
|
|
* the method will return <tt>null</tt>.
|
|
* The object is not GZip-compressed before being encoded.
|
|
*
|
|
* @param serializableObject The object to encode
|
|
* @return The Base64-encoded object
|
|
* @since 1.4
|
|
*/
|
|
public static String encodeObject( java.io.Serializable serializableObject )
|
|
{
|
|
return encodeObject( serializableObject, NO_OPTIONS );
|
|
} // end encodeObject
|
|
|
|
|
|
|
|
/**
|
|
* Serializes an object and returns the Base64-encoded
|
|
* version of that serialized object. If the object
|
|
* cannot be serialized or there is another error,
|
|
* the method will return <tt>null</tt>.
|
|
* <p>
|
|
* Valid options:<pre>
|
|
* GZIP: gzip-compresses object before encoding it.
|
|
* DONT_BREAK_LINES: don't break lines at 76 characters
|
|
* <i>Note: Technically, this makes your encoding non-compliant.</i>
|
|
* </pre>
|
|
* <p>
|
|
* Example: <code>encodeObject( myObj, Base64.GZIP )</code> or
|
|
* <p>
|
|
* Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
|
|
*
|
|
* @param serializableObject The object to encode
|
|
* @param options Specified options
|
|
* @return The Base64-encoded object
|
|
* @see Base64#GZIP
|
|
* @see Base64#DONT_BREAK_LINES
|
|
* @since 2.0
|
|
*/
|
|
public static String encodeObject( java.io.Serializable serializableObject, int options )
|
|
{
|
|
// Streams
|
|
java.io.ByteArrayOutputStream baos = null;
|
|
java.io.OutputStream b64os = null;
|
|
java.io.ObjectOutputStream oos = null;
|
|
java.util.zip.GZIPOutputStream gzos = null;
|
|
|
|
// Isolate options
|
|
int gzip = (options & GZIP);
|
|
int dontBreakLines = (options & DONT_BREAK_LINES);
|
|
|
|
try
|
|
{
|
|
// ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
|
|
baos = new java.io.ByteArrayOutputStream();
|
|
b64os = new Base64.OutputStream( baos, ENCODE | options );
|
|
|
|
// GZip?
|
|
if( gzip == GZIP )
|
|
{
|
|
gzos = new java.util.zip.GZIPOutputStream( b64os );
|
|
oos = new java.io.ObjectOutputStream( gzos );
|
|
} // end if: gzip
|
|
else
|
|
oos = new java.io.ObjectOutputStream( b64os );
|
|
|
|
oos.writeObject( serializableObject );
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
e.printStackTrace();
|
|
return null;
|
|
} // 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)
|
|
{
|
|
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
|
|
* @since 1.4
|
|
*/
|
|
public static String encodeBytes( byte[] source )
|
|
{
|
|
return encodeBytes( source, 0, source.length, NO_OPTIONS );
|
|
} // end encodeBytes
|
|
|
|
|
|
|
|
/**
|
|
* Encodes a byte array into Base64 notation.
|
|
* <p>
|
|
* Valid options:<pre>
|
|
* GZIP: gzip-compresses object before encoding it.
|
|
* DONT_BREAK_LINES: don't 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.DONT_BREAK_LINES )</code>
|
|
*
|
|
*
|
|
* @param source The data to convert
|
|
* @param options Specified options
|
|
* @see Base64#GZIP
|
|
* @see Base64#DONT_BREAK_LINES
|
|
* @since 2.0
|
|
*/
|
|
public static String encodeBytes( byte[] source, int options )
|
|
{
|
|
return encodeBytes( source, 0, source.length, options );
|
|
} // end encodeBytes
|
|
|
|
|
|
/**
|
|
* Encodes a byte array into Base64 notation.
|
|
* Does not GZip-compress data.
|
|
*
|
|
* @param source The data to convert
|
|
* @param off Offset in array where conversion should begin
|
|
* @param len Length of data to convert
|
|
* @since 1.4
|
|
*/
|
|
public static String encodeBytes( byte[] source, int off, int len )
|
|
{
|
|
return encodeBytes( source, off, len, NO_OPTIONS );
|
|
} // end encodeBytes
|
|
|
|
|
|
|
|
/**
|
|
* Encodes a byte array into Base64 notation.
|
|
* <p>
|
|
* Valid options:<pre>
|
|
* GZIP: gzip-compresses object before encoding it.
|
|
* DONT_BREAK_LINES: don't 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.DONT_BREAK_LINES )</code>
|
|
*
|
|
*
|
|
* @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; alphabet type is pulled from this (standard, url-safe, ordered)
|
|
* @see Base64#GZIP
|
|
* @see Base64#DONT_BREAK_LINES
|
|
* @since 2.0
|
|
*/
|
|
public static String encodeBytes( byte[] source, int off, int len, int options )
|
|
{
|
|
// Isolate options
|
|
int dontBreakLines = ( options & DONT_BREAK_LINES );
|
|
int gzip = ( options & GZIP );
|
|
|
|
// Compress?
|
|
if( gzip == GZIP )
|
|
{
|
|
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 )
|
|
{
|
|
e.printStackTrace();
|
|
return null;
|
|
} // end catch
|
|
finally
|
|
{
|
|
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)
|
|
{
|
|
return new String( baos.toByteArray() );
|
|
} // end catch
|
|
} // end if: compress
|
|
|
|
// Else, don't compress. Better not to use streams at all then.
|
|
else
|
|
{
|
|
// Convert option to boolean in way that code likes it.
|
|
boolean breakLines = dontBreakLines == 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
|
|
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
|
|
|
|
|
|
// Return value according to relevant encoding.
|
|
try
|
|
{
|
|
return new String( outBuff, 0, e, PREFERRED_ENCODING );
|
|
} // end try
|
|
catch (java.io.UnsupportedEncodingException uue)
|
|
{
|
|
return new String( outBuff, 0, e );
|
|
} // end catch
|
|
|
|
} // end else: don't compress
|
|
|
|
} // end encodeBytes
|
|
|
|
|
|
|
|
|
|
|
|
/* ******** 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
|
|
* @since 1.3
|
|
*/
|
|
private static int decode4to3( byte[] source, int srcOffset, byte[] destination, int destOffset, int options )
|
|
{
|
|
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
|
|
{
|
|
try{
|
|
// 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;
|
|
}catch( Exception e){
|
|
System.out.println(""+source[srcOffset]+ ": " + ( DECODABET[ source[ srcOffset ] ] ) );
|
|
System.out.println(""+source[srcOffset+1]+ ": " + ( DECODABET[ source[ srcOffset + 1 ] ] ) );
|
|
System.out.println(""+source[srcOffset+2]+ ": " + ( DECODABET[ source[ srcOffset + 2 ] ] ) );
|
|
System.out.println(""+source[srcOffset+3]+ ": " + ( DECODABET[ source[ srcOffset + 3 ] ] ) );
|
|
return -1;
|
|
} // end catch
|
|
}
|
|
} // end decodeToBytes
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Very low-level access to decoding ASCII characters in
|
|
* the form of a byte array. Does not support automatically
|
|
* gunzipping or any other "fancy" features.
|
|
*
|
|
* @param source The Base64 encoded data
|
|
* @param off The offset of where to begin decoding
|
|
* @param len The length of characters to decode
|
|
* @return decoded data
|
|
* @since 1.3
|
|
*/
|
|
public static byte[] decode( byte[] source, int off, int len, int options )
|
|
{
|
|
byte[] DECODABET = getDecodabet( options );
|
|
|
|
int len34 = len * 3 / 4;
|
|
byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output
|
|
int outBuffPosn = 0;
|
|
|
|
byte[] b4 = new byte[4];
|
|
int b4Posn = 0;
|
|
int i = 0;
|
|
byte sbiCrop = 0;
|
|
byte sbiDecode = 0;
|
|
for( i = off; i < off+len; i++ )
|
|
{
|
|
sbiCrop = (byte)(source[i] & 0x7f); // Only the low seven bits
|
|
sbiDecode = DECODABET[ sbiCrop ];
|
|
|
|
if( sbiDecode >= WHITE_SPACE_ENC ) // White space, Equals sign or better
|
|
{
|
|
if( sbiDecode >= EQUALS_SIGN_ENC )
|
|
{
|
|
b4[ b4Posn++ ] = sbiCrop;
|
|
if( b4Posn > 3 )
|
|
{
|
|
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: quartet built
|
|
|
|
} // end if: equals sign or better
|
|
|
|
} // end if: white space, equals sign or better
|
|
else
|
|
{
|
|
System.err.println( "Bad Base64 input character at " + i + ": " + source[i] + "(decimal)" );
|
|
return null;
|
|
} // 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
|
|
* @since 1.4
|
|
*/
|
|
public static byte[] decode( String s )
|
|
{
|
|
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
|
|
* @since 1.4
|
|
*/
|
|
public static byte[] decode( String s, int options )
|
|
{
|
|
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)
|
|
if( bytes != null && bytes.length >= 4 )
|
|
{
|
|
|
|
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 )
|
|
{
|
|
// 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
|
|
* @since 1.5
|
|
*/
|
|
public static Object decodeToObject( String encodedObject )
|
|
{
|
|
// Decode and gunzip if necessary
|
|
byte[] objBytes = decode( encodedObject );
|
|
|
|
java.io.ByteArrayInputStream bais = null;
|
|
java.io.ObjectInputStream ois = null;
|
|
Object obj = null;
|
|
|
|
try
|
|
{
|
|
bais = new java.io.ByteArrayInputStream( objBytes );
|
|
ois = new java.io.ObjectInputStream( bais );
|
|
|
|
obj = ois.readObject();
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
e.printStackTrace();
|
|
obj = null;
|
|
} // end catch
|
|
catch( java.lang.ClassNotFoundException e )
|
|
{
|
|
e.printStackTrace();
|
|
obj = null;
|
|
} // 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.
|
|
*
|
|
* @param dataToEncode byte array of data to encode in base64 form
|
|
* @param filename Filename for saving encoded data
|
|
* @return <tt>true</tt> if successful, <tt>false</tt> otherwise
|
|
*
|
|
* @since 2.1
|
|
*/
|
|
public static boolean encodeToFile( byte[] dataToEncode, String filename )
|
|
{
|
|
boolean success = false;
|
|
Base64.OutputStream bos = null;
|
|
try
|
|
{
|
|
bos = new Base64.OutputStream(
|
|
new java.io.FileOutputStream( filename ), Base64.ENCODE );
|
|
bos.write( dataToEncode );
|
|
success = true;
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
|
|
success = false;
|
|
} // end catch: IOException
|
|
finally
|
|
{
|
|
try{ bos.close(); } catch( Exception e ){}
|
|
} // end finally
|
|
|
|
return success;
|
|
} // end encodeToFile
|
|
|
|
|
|
/**
|
|
* Convenience method for decoding data to a file.
|
|
*
|
|
* @param dataToDecode Base64-encoded data as a string
|
|
* @param filename Filename for saving decoded data
|
|
* @return <tt>true</tt> if successful, <tt>false</tt> otherwise
|
|
*
|
|
* @since 2.1
|
|
*/
|
|
public static boolean decodeToFile( String dataToDecode, String filename )
|
|
{
|
|
boolean success = false;
|
|
Base64.OutputStream bos = null;
|
|
try
|
|
{
|
|
bos = new Base64.OutputStream(
|
|
new java.io.FileOutputStream( filename ), Base64.DECODE );
|
|
bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );
|
|
success = true;
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
success = false;
|
|
} // end catch: IOException
|
|
finally
|
|
{
|
|
try{ bos.close(); } catch( Exception e ){}
|
|
} // end finally
|
|
|
|
return success;
|
|
} // end decodeToFile
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Convenience method for reading a base64-encoded
|
|
* file and decoding it.
|
|
*
|
|
* @param filename Filename for reading encoded data
|
|
* @return decoded byte array or null if unsuccessful
|
|
*
|
|
* @since 2.1
|
|
*/
|
|
public static byte[] decodeFromFile( String filename )
|
|
{
|
|
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 )
|
|
{
|
|
System.err.println( "File is too big for this convenience method (" + file.length() + " bytes)." );
|
|
return null;
|
|
} // 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;
|
|
|
|
// Save in a variable to return
|
|
decodedData = new byte[ length ];
|
|
System.arraycopy( buffer, 0, decodedData, 0, length );
|
|
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
System.err.println( "Error decoding from file " + filename );
|
|
} // end catch: 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.
|
|
*
|
|
* @param filename Filename for reading binary data
|
|
* @return base64-encoded string or null if unsuccessful
|
|
*
|
|
* @since 2.1
|
|
*/
|
|
public static String encodeFromFile( String filename )
|
|
{
|
|
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;
|
|
|
|
// Save in a variable to return
|
|
encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );
|
|
|
|
} // end try
|
|
catch( java.io.IOException e )
|
|
{
|
|
System.err.println( "Error encoding from file " + filename );
|
|
} // end catch: 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
|
|
* @since 2.2
|
|
*/
|
|
public static void encodeFileToFile( String infile, String outfile )
|
|
{
|
|
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 ex ) {
|
|
ex.printStackTrace();
|
|
} // 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
|
|
* @since 2.2
|
|
*/
|
|
public static void decodeFileToFile( String infile, String outfile )
|
|
{
|
|
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 ex ) {
|
|
ex.printStackTrace();
|
|
} // 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[] alphabet; // Local copies to avoid extra method calls
|
|
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.
|
|
* DONT_BREAK_LINES: don't break lines at 76 characters
|
|
* (only meaningful when encoding)
|
|
* <i>Note: Technically, this makes your encoding non-compliant.</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#DONT_BREAK_LINES
|
|
* @since 2.0
|
|
*/
|
|
public InputStream( java.io.InputStream in, int options )
|
|
{
|
|
super( in );
|
|
this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
|
|
this.encode = (options & ENCODE) == ENCODE;
|
|
this.bufferLength = encode ? 4 : 3;
|
|
this.buffer = new byte[ bufferLength ];
|
|
this.position = -1;
|
|
this.lineLength = 0;
|
|
this.options = options; // Record for later, mostly to determine which alphabet to use
|
|
this.alphabet = getAlphabet(options);
|
|
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
|
|
*/
|
|
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++ )
|
|
{
|
|
try
|
|
{
|
|
int b = in.read();
|
|
|
|
// If end of stream, b is -1.
|
|
if( b >= 0 )
|
|
{
|
|
b3[i] = (byte)b;
|
|
numBinaryBytes++;
|
|
} // end if: not end of stream
|
|
|
|
} // end try: read
|
|
catch( java.io.IOException e )
|
|
{
|
|
// Only a problem if we got no data at all.
|
|
if( i == 0 )
|
|
throw e;
|
|
|
|
} // end catch
|
|
} // 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;
|
|
} // 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
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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
|
|
{
|
|
// When JDK1.4 is more accepted, use an assertion here.
|
|
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
|
|
*/
|
|
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 && i == 0 )
|
|
// return -1;
|
|
|
|
if( b >= 0 )
|
|
dest[off + i] = (byte)b;
|
|
else if( i == 0 )
|
|
return -1;
|
|
else
|
|
break; // 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[] alphabet; // Local copies to avoid extra method calls
|
|
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.
|
|
* DONT_BREAK_LINES: don't break lines at 76 characters
|
|
* (only meaningful when encoding)
|
|
* <i>Note: Technically, this makes your encoding non-compliant.</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#DONT_BREAK_LINES
|
|
* @since 1.3
|
|
*/
|
|
public OutputStream( java.io.OutputStream out, int options )
|
|
{
|
|
super( out );
|
|
this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
|
|
this.encode = (options & ENCODE) == ENCODE;
|
|
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.alphabet = getAlphabet(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
|
|
*/
|
|
public void write(int theByte) throws java.io.IOException
|
|
{
|
|
// Encoding suspended?
|
|
if( suspendEncoding )
|
|
{
|
|
super.out.write( theByte );
|
|
return;
|
|
} // end if: supsended
|
|
|
|
// Encode?
|
|
if( encode )
|
|
{
|
|
buffer[ position++ ] = (byte)theByte;
|
|
if( position >= bufferLength ) // Enough to encode.
|
|
{
|
|
out.write( encode3to4( b4, buffer, bufferLength, options ) );
|
|
|
|
lineLength += 4;
|
|
if( breakLines && lineLength >= MAX_LINE_LENGTH )
|
|
{
|
|
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 );
|
|
//out.write( Base64.decode4to3( buffer ) );
|
|
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
|
|
*/
|
|
public void write( byte[] theBytes, int off, int len ) throws java.io.IOException
|
|
{
|
|
// Encoding suspended?
|
|
if( suspendEncoding )
|
|
{
|
|
super.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.
|
|
*/
|
|
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
|
|
*/
|
|
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
|
|
* base640-encoded data in a stream.
|
|
*
|
|
* @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
|
|
* base640-encoded data in a stream.
|
|
*
|
|
* @since 1.5.1
|
|
*/
|
|
public void resumeEncoding()
|
|
{
|
|
this.suspendEncoding = false;
|
|
} // end resumeEncoding
|
|
|
|
|
|
|
|
} // end inner class OutputStream
|
|
|
|
|
|
} // end class Base64
|
|
|