package com.revolsys.util;
import java.io.UnsupportedEncodingException;
/**
* <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>
* 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 (though that breaks strict Base64
* compatibility), and encoding using the URL-safe and Ordered dialects.
* </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.DONT_BREAK_LINES );</code>
* <p>
* to compress the data before encoding it and then making the output have no
* newline characters.
* </p>
* <p>
* Change Log:
* </p>
* <ul>
* <li>v2.2.2 - Fixed encodeFileToFile and decodeFileToFile to use the
* Base64.InputStream class to encode and decode on the fly which uses less
* memory than encoding/decoding an entire file into memory before writing.</li>
* <li>v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug when
* using very small files (~< 40 bytes).</li>
* <li>v2.2 - Added some helper methods for encoding/decoding directly from one
* file to the next. Also added a main() method to support command line
* encoding/decoding from one file to the next. Also added these Base64
* dialects:
* <ol>
* <li>The default is RFC3548 format.</li>
* <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates
* URL and file name friendly format as described in Section 4 of RFC3548.
* http://www.faqs.org/rfcs/rfc3548.html</li>
* <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates
* URL and file name friendly format that preserves lexical ordering as
* described in http://www.faqs.org/qa/rfcc-1940.html</li>
* </ol>
* Special thanks to Jim Kellerman at <a
* href="http://www.powerset.com/">http://www.powerset.com/</a> for contributing
* the new Base64 dialects.</li>
* <li>v2.1 - Cleaned up javadoc comments and unused variables and methods.
* Added some convenience methods for reading and writing to and from files.</li>
* <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on
* systems with other encodings (like EBCDIC).</li>
* <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the
* encoded data was a single byte.</li>
* <li>v2.0 - I got rid of methods that used booleans to set options. Now
* everything is more consolidated and cleaner. The code now detects when data
* that's being decoded is gzip-compressed and will decompress it automatically.
* Generally things are cleaner. You'll probably have to change some method
* calls that you were making to support the new options format (<tt>int</tt>s
* that you "OR" together).</li>
* <li>v1.5.1 - Fixed bug when decompressing and decoding to a byte[] using
* <tt>decode( String s, boolean gzipCompressed )</tt>. Added the ability to
* "suspend" encoding in the Output Stream so you can turn on and off the
* encoding if you need to embed base64 data in an otherwise "normal" stream
* (like an XML file).</li>
* <li>v1.5 - Output stream pases on flush() command but doesn't do anything
* itself. This helps when using GZIP streams. Added the ability to
* GZip-compress objects before encoding them.</li>
* <li>v1.4 - Added helper methods to read/write files.</li>
* <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>
* <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input
* stream where last buffer being read, if not completely full, was not
* returned.</li>
* <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the
* wrong time.</li>
* <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>
* </ul>
* <p>
* I am placing this code in the Public Domain. Do with it as you will. This
* software comes with no guarantees or warranties but with plenty of
* well-wishing instead! Please visit <a
* href="http://iharder.net/base64">http://iharder.net/base64</a> periodically
* to check for updates or to contribute improvements.
* </p>
*
* @author Robert Harder
* @author rob@iharder.net
* @version 2.2.2
*/
public class Base64 {
/* P U B L I C Q I E L D S */
/**
* 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 final byte[] b4; // Scratch used in a few places
private final boolean breakLines;
private byte[] buffer;
private final int bufferLength;
private final byte[] decodabet; // Local copies to avoid extra method calls
private final boolean encode;
private int lineLength;
private final int options; // Record for later
private int position;
private boolean suspendEncoding;
/**
* 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(final 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(final java.io.OutputStream out, final int options) {
super(out);
this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
this.encode = (options & ENCODE) == ENCODE;
this.bufferLength = this.encode ? 3 : 4;
this.buffer = new byte[this.bufferLength];
this.position = 0;
this.lineLength = 0;
this.suspendEncoding = false;
this.b4 = new byte[4];
this.options = options;
this.decodabet = getDecodabet(options);
} // end constructor
/**
* 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();
this.buffer = null;
this.out = null;
} // end close
/**
* Method added by PHIL. [Thanks, PHIL. -Rob] This pads the buffer without
* closing the stream.
*/
public void flushBase64() throws java.io.IOException {
if (this.position > 0) {
if (this.encode) {
this.out.write(encode3to4(this.b4, this.buffer, this.position, this.options));
this.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
/**
* 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
/**
* 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
/**
* 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(final byte[] theBytes, final int off, final int len)
throws java.io.IOException {
// Encoding suspended?
if (this.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
/**
* 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(final int theByte) throws java.io.IOException {
// Encoding suspended?
if (this.suspendEncoding) {
super.out.write(theByte);
return;
} // end if: supsended
// Encode?
if (this.encode) {
this.buffer[this.position++] = (byte)theByte;
if (this.position >= this.bufferLength) // Enough to encode.
{
this.out.write(encode3to4(this.b4, this.buffer, this.bufferLength, this.options));
this.lineLength += 4;
if (this.breakLines && this.lineLength >= MAX_LINE_LENGTH) {
this.out.write(NEW_LINE);
this.lineLength = 0;
} // end if: end of line
this.position = 0;
} // end if: enough to output
} // end if: encoding
// Else, Decoding
else {
// Meaningful Base64 character?
if (this.decodabet[theByte & 0x7f] > WHITE_SPACE_ENC) {
this.buffer[this.position++] = (byte)theByte;
if (this.position >= this.bufferLength) // Enough to output.
{
final int len = Base64.decode4to3(this.buffer, 0, this.b4, 0, this.options);
this.out.write(this.b4, 0, len);
// out.write( Base64.decode4to3( buffer ) );
this.position = 0;
} // end if: enough to output
} // end if: meaningful base64 character
else if (this.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
} // end inner class OutputStream
/**
* I don't get the point of this technique, but 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
*/
};
/** The 64 valid Base64 values. */
// private final static byte[] ALPHABET;
/*
* Host platform me be something funny like EBCDIC, so we hardcode these values.
*/
private final static byte[] _STANDARD_ALPHABET = {
(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', (byte)'H',
(byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', (byte)'O', (byte)'P',
(byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', (byte)'V', (byte)'W', (byte)'X',
(byte)'Y', (byte)'Z', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f',
(byte)'g', (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', (byte)'v',
(byte)'w', (byte)'x', (byte)'y', (byte)'z', (byte)'0', (byte)'1', (byte)'2', (byte)'3',
(byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'
};
/**
* Translates a Base64 value to either its 6-bit reconstruction value or a
* negative number indicating some other meaning.
**/
private final static byte[] _STANDARD_DECODABET = {
-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8
-5, -5, // Whitespace: Tab and Linefeed
-9, -9, // Decimal 11 - 12
-5, // Whitespace: Carriage Return
-9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26
-9, -9, -9, -9, -9, // Decimal 27 - 31
-5, // Whitespace: Space
-9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42
62, // Plus sign at decimal 43
-9, -9, -9, // Decimal 44 - 46
63, // Slash at decimal 47
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
-9, -9, -9, // 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
*/
};
/**
* 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."
*/
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)'_'
};
/* P R I V A T E Q I E L D S */
/**
* 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
*/
};
/** Specify decoding. */
public final static int DECODE = 0;
/** Don't break lines when encoding (violates strict Base64 specification) */
public final static int DONT_BREAK_LINES = 8;
/** Specify encoding. */
public final static int ENCODE = 1;
/** The equals sign (=) as a byte. */
private final static byte EQUALS_SIGN = (byte)'=';
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 */
/** Specify that data should be gzip-compressed. */
public final static int GZIP = 2;
/** Maximum line length (76) of Base64 output. */
final static int MAX_LINE_LENGTH = 76;
/* U R L S A Q E B A S E 6 4 A L P H A B E T */
/** The new line character (\n) as a byte. */
private final static byte NEW_LINE = (byte)'\n';
/** No options specified. Value is zero. */
public final static int NO_OPTIONS = 0;
/* O R D E R E D B A S E 6 4 A L P H A B E T */
/**
* 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;
/** Preferred encoding. */
private final static String PREFERRED_ENCODING = "UTF-8";
/* D E T E R M I N E W H I C H A L H A B E T */
/**
* 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;
// I think I end up not using the BAD_ENCODING indicator.
// private final static byte BAD_ENCODING = -9; // Indicates error in encoding
final static byte WHITE_SPACE_ENC = -5; // Indicates white space in
// encoding
/**
* 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(final byte[] source, final int off, final int len,
final int options) {
final byte[] DECODABET = getDecodabet(options);
final int len34 = len * 3 / 4;
final byte[] outBuff = new byte[len34]; // Upper limit on size of output
int outBuffPosn = 0;
final 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
final 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(final 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(final String s, final int options) {
byte[] bytes;
try {
bytes = s.getBytes(PREFERRED_ENCODING);
} // end try
catch (final 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) {
final int head = 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;
final 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 (final java.io.IOException e) {
// Just return originally-decoded bytes
} // end catch
finally {
try {
baos.close();
} catch (final Exception e) {
}
try {
gzis.close();
} catch (final Exception e) {
}
try {
bais.close();
} catch (final Exception e) {
}
} // end finally
} // end if: gzipped
} // end if: bytes.length >= 2
return bytes;
} // end decode
static int decode4to3(final byte[] source, final int srcOffset, final byte[] destination,
final int destOffset) {
final byte[] decodeabet = _STANDARD_DECODABET;
if (source[srcOffset + 2] == EQUALS_SIGN) {
final int outBuff = (decodeabet[source[srcOffset]] & 0xFF) << 18
| (decodeabet[source[srcOffset + 1]] & 0xFF) << 12;
destination[destOffset] = (byte)(outBuff >>> 16);
return 1;
}
else if (source[srcOffset + 3] == EQUALS_SIGN) {
final int outBuff = (decodeabet[source[srcOffset]] & 0xFF) << 18
| (decodeabet[source[srcOffset + 1]] & 0xFF) << 12
| (decodeabet[source[srcOffset + 2]] & 0xFF) << 6;
destination[destOffset] = (byte)(outBuff >>> 16);
destination[destOffset + 1] = (byte)(outBuff >>> 8);
return 2;
}
else {
try {
final int outBuff = (decodeabet[source[srcOffset]] & 0xFF) << 18
| (decodeabet[source[srcOffset + 1]] & 0xFF) << 12
| (decodeabet[source[srcOffset + 2]] & 0xFF) << 6
| decodeabet[source[srcOffset + 3]] & 0xFF;
destination[destOffset] = (byte)(outBuff >> 16);
destination[destOffset + 1] = (byte)(outBuff >> 8);
destination[destOffset + 2] = (byte)outBuff;
return 3;
} catch (final Exception e) {
return -1;
}
}
}
/**
* 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
*/
static int decode4to3(final byte[] source, final int srcOffset, final byte[] destination,
final int destOffset, final int options) {
final 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 );
final 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 );
final 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 );
final 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 (final 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
public static byte[] decodeBytesNoWrap(final byte[] source) {
final byte[] DECODABET = _STANDARD_DECODABET;
final int len = source.length;
final int len34 = len * 3 / 4;
final byte[] outBuff = new byte[len34];
int outBuffPosn = 0;
final byte[] b4 = new byte[4];
int b4Posn = 0;
int i = 0;
byte sbiCrop = 0;
byte sbiDecode = 0;
for (i = 0; i < len; i++) {
sbiCrop = (byte)(source[i] & 0x7f);
sbiDecode = DECODABET[sbiCrop];
if (sbiDecode >= EQUALS_SIGN_ENC) {
b4[b4Posn++] = sbiCrop;
if (b4Posn > 3) {
outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn);
b4Posn = 0;
if (sbiCrop == EQUALS_SIGN) {
break;
}
}
} else {
return null;
}
}
if (outBuffPosn == outBuff.length) {
return outBuff;
} else {
final byte[] out = new byte[outBuffPosn];
System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
return out;
}
}
public static byte[] decodeBytesNoWrap(final String text) {
try {
return decodeBytesNoWrap(text.getBytes("UTF-8"));
} catch (final UnsupportedEncodingException e) {
return null;
}
}
/* E N C O D I N G M E T H O D S */
/**
* Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>.
*
* @param infile Input file
* @param outfile Output file
* @return true if the operation is successful
* @since 2.2
*/
public static boolean decodeFileToFile(final String infile, final String outfile) {
boolean success = false;
java.io.InputStream in = null;
java.io.OutputStream out = null;
try {
in = new Base64InputStream(
new java.io.BufferedInputStream(new java.io.FileInputStream(infile)), Base64.DECODE);
out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile));
final byte[] buffer = new byte[65536]; // 64K
int read = -1;
while ((read = in.read(buffer)) >= 0) {
out.write(buffer, 0, read);
} // end while: through file
success = true;
} catch (final java.io.IOException exc) {
exc.printStackTrace();
} finally {
try {
in.close();
} catch (final Exception exc) {
}
try {
out.close();
} catch (final Exception exc) {
}
} // end finally
return success;
} // end decodeFileToFile
/**
* 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(final String filename) {
byte[] decodedData = null;
Base64InputStream bis = null;
try {
// Set up some useful variables
final 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 Base64InputStream(
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 (final java.io.IOException e) {
System.err.println("Error decoding from file " + filename);
} // end catch: IOException
finally {
try {
bis.close();
} catch (final Exception e) {
}
} // end finally
return decodedData;
} // end decodeFromFile
/**
* 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(final String dataToDecode, final 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 (final java.io.IOException e) {
success = false;
} // end catch: IOException
finally {
try {
bos.close();
} catch (final Exception e) {
}
} // end finally
return success;
} // end decodeToFile
/**
* 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(final String encodedObject) {
// Decode and gunzip if necessary
final 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 (final java.io.IOException e) {
e.printStackTrace();
obj = null;
} // end catch
catch (final java.lang.ClassNotFoundException e) {
e.printStackTrace();
obj = null;
} // end catch
finally {
try {
bais.close();
} catch (final Exception e) {
}
try {
ois.close();
} catch (final Exception e) {
}
} // end finally
return obj;
} // end decodeObject
public static String decodeToString(final String string) {
final byte[] data = decode(string);
return new String(data);
}
public static String encode(final String string) {
return encodeBytes(string.getBytes());
}
/**
* 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(final byte[] b4, final byte[] threeBytes, final int numSigBytes,
final int options) {
encode3to4(threeBytes, 0, numSigBytes, b4, 0, options);
return b4;
} // end encode3to4
static byte[] encode3to4(final byte[] source, final int srcOffset, final int numSigBytes,
final byte[] destination, final int destOffset) {
final byte[] alhpabet = _STANDARD_ALPHABET;
final 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] = alhpabet[inBuff >>> 18];
destination[destOffset + 1] = alhpabet[inBuff >>> 12 & 0x3f];
destination[destOffset + 2] = alhpabet[inBuff >>> 6 & 0x3f];
destination[destOffset + 3] = alhpabet[inBuff & 0x3f];
return destination;
case 2:
destination[destOffset] = alhpabet[inBuff >>> 18];
destination[destOffset + 1] = alhpabet[inBuff >>> 12 & 0x3f];
destination[destOffset + 2] = alhpabet[inBuff >>> 6 & 0x3f];
destination[destOffset + 3] = EQUALS_SIGN;
return destination;
case 1:
destination[destOffset] = alhpabet[inBuff >>> 18];
destination[destOffset + 1] = alhpabet[inBuff >>> 12 & 0x3f];
destination[destOffset + 2] = EQUALS_SIGN;
destination[destOffset + 3] = EQUALS_SIGN;
return destination;
default:
return destination;
}
}
/**
* <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
*/
static byte[] encode3to4(final byte[] source, final int srcOffset, final int numSigBytes,
final byte[] destination, final int destOffset, final int options) {
final 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.
final 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
/**
* 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(final byte[] source) {
return encodeBytes(source, 0, source.length, NO_OPTIONS);
} // end encodeBytes
/* D E C O D I N G M E T H O D S */
/**
* 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(final byte[] source, final 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(final byte[] source, final int off, final 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
* @param 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(final byte[] source, final int off, final int len,
final int options) {
// Isolate options
final int dontBreakLines = options & DONT_BREAK_LINES;
final 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 (final java.io.IOException e) {
e.printStackTrace();
return null;
} // end catch
finally {
try {
gzos.close();
} catch (final Exception e) {
}
try {
b64os.close();
} catch (final Exception e) {
}
try {
baos.close();
} catch (final Exception e) {
}
} // end finally
// Return value according to relevant encoding.
try {
return new String(baos.toByteArray(), PREFERRED_ENCODING);
} // end try
catch (final 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.
final boolean breakLines = dontBreakLines == 0;
final int len43 = len * 4 / 3;
final 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;
final 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 (final java.io.UnsupportedEncodingException uue) {
return new String(outBuff, 0, e);
} // end catch
} // end else: don't compress
} // end encodeBytes
public static String encodeBytesNoWrap(final byte[] source) {
final int len = source.length;
final int len43 = len * 4 / 3;
final byte[] outBuff = new byte[len43 + (len % 3 > 0 ? 4 : 0)];
int d = 0;
int e = 0;
final int len2 = len - 2;
for (; d < len2; d += 3, e += 4) {
encode3to4(source, d, 3, outBuff, e);
}
if (d < len) {
encode3to4(source, d, len - d, outBuff, e);
e += 4;
}
try {
return new String(outBuff, 0, e, PREFERRED_ENCODING);
} catch (final java.io.UnsupportedEncodingException uue) {
Exceptions.throwUncheckedException(uue);
return null;
}
}
/**
* Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>.
*
* @param infile Input file
* @param outfile Output file
* @return true if the operation is successful
* @since 2.2
*/
public static boolean encodeFileToFile(final String infile, final String outfile) {
boolean success = false;
java.io.InputStream in = null;
java.io.OutputStream out = null;
try {
in = new Base64InputStream(
new java.io.BufferedInputStream(new java.io.FileInputStream(infile)), Base64.ENCODE);
out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile));
final byte[] buffer = new byte[65536]; // 64K
int read = -1;
while ((read = in.read(buffer)) >= 0) {
out.write(buffer, 0, read);
} // end while: through file
success = true;
} catch (final java.io.IOException exc) {
exc.printStackTrace();
} finally {
try {
in.close();
} catch (final Exception exc) {
}
try {
out.close();
} catch (final Exception exc) {
}
} // end finally
return success;
} // end encodeFileToFile
/**
* 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(final String filename) {
String encodedData = null;
Base64InputStream bis = null;
try {
// Set up some useful variables
final java.io.File file = new java.io.File(filename);
final 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 Base64InputStream(
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 (final java.io.IOException e) {
System.err.println("Error encoding from file " + filename);
} // end catch: IOException
finally {
try {
bis.close();
} catch (final Exception e) {
}
} // end finally
return encodedData;
} // end encodeFromFile
/**
* 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(final 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(final java.io.Serializable serializableObject,
final 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
final int gzip = options & GZIP;
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 (final java.io.IOException e) {
e.printStackTrace();
return null;
} // end catch
finally {
try {
oos.close();
} catch (final Exception e) {
}
try {
gzos.close();
} catch (final Exception e) {
}
try {
b64os.close();
} catch (final Exception e) {
}
try {
baos.close();
} catch (final Exception e) {
}
} // end finally
// Return value according to relevant encoding.
try {
return new String(baos.toByteArray(), PREFERRED_ENCODING);
} // end try
catch (final java.io.UnsupportedEncodingException uue) {
return new String(baos.toByteArray());
} // end catch
} // end encode
/**
* 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(final byte[] dataToEncode, final 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 (final java.io.IOException e) {
success = false;
} // end catch: IOException
finally {
try {
bos.close();
} catch (final Exception e) {
}
} // end finally
return success;
} // end encodeToFile
/**
* Returns one of the _SOMETHING_ALPHABET byte arrays depending on the options
* specified. It's possible, though silly, to specify ORDERED and URLSAFE in
* which case one of them will be picked, though there is no guarantee as to
* which one will be picked.
*/
final static byte[] getAlphabet(final 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.
*/
final static byte[] getDecodabet(final 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
/**
* 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(final String[] args) {
if (args.length < 3) {
usage("Not enough arguments.");
} // end if: args.length < 3
else {
final String flag = args[0];
final String infile = args[1];
final 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
/* I N N E R C L A S S I N P U T S T R E A M */
/**
* Prints command line usage.
*
* @param msg A message to include with usage info.
*/
private final static void usage(final String msg) {
System.err.println(msg);
System.err.println("Usage: java Base64 -e|-d inputfile outputfile");
} // end usage
/* I N N E R C L A S S O U T P U T S T R E A M */
/** Defeats instantiation. */
private Base64() {
}
} // end class Base64