-package org.asamk.signal.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>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 / commitdiff
