From: Robert Harder <rob@xxxxxxxxxxx> Some transports require Base64 encoding of certain data fields, such as the "encryption" used in HTTP basic authentication header fields. The wise people at Sun have never included the incredibly widely used Base64 encoding/decoding algorithms as part of the base JRE, forcing everyone to include their own library. Fortunately for us Robert Harder distributes one in the public domain. Signed-off-by: Shawn O. Pearce <spearce@xxxxxxxxxxx> --- .../src/org/spearce/jgit/util/Base64.java | 1459 ++++++++++++++++++++ 1 files changed, 1459 insertions(+), 0 deletions(-) create mode 100644 org.spearce.jgit/src/org/spearce/jgit/util/Base64.java diff --git a/org.spearce.jgit/src/org/spearce/jgit/util/Base64.java b/org.spearce.jgit/src/org/spearce/jgit/util/Base64.java new file mode 100644 index 0000000..b0c19b6 --- /dev/null +++ b/org.spearce.jgit/src/org/spearce/jgit/util/Base64.java @@ -0,0 +1,1459 @@ +// +// NOTE: The following source code is the iHarder.net public domain +// Base64 library and is provided here as a convenience. For updates, +// problems, questions, etc. regarding this code, please visit: +// http://iharder.sourceforge.net/current/java/base64/ +// + +package org.spearce.jgit.util; + + +/** + * Encodes and decodes to and from Base64 notation. + * + * <p> + * Change Log: + * </p> + * <ul> + * <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@xxxxxxxxxxx + * @version 2.1 + */ +public class Base64 +{ + +/* ******** P U B L I C F I E L D S ******** */ + + + /** No options specified. Value is zero. */ + public final static int NO_OPTIONS = 0; + + /** Specify encoding. */ + public final static int ENCODE = 1; + + + /** Specify decoding. */ + public final static int DECODE = 0; + + + /** Specify that data should be gzip-compressed. */ + public final static int GZIP = 2; + + + /** Don't break lines when encoding (violates strict Base64 specification) */ + public final static int DONT_BREAK_LINES = 8; + + +/* ******** P R I V A T E F I E L D S ******** */ + + + /** Maximum line length (76) of Base64 output. */ + private final static int MAX_LINE_LENGTH = 76; + + + /** The equals sign (=) as a byte. */ + private final static byte EQUALS_SIGN = (byte)'='; + + + /** The new line character (\n) as a byte. */ + private final static byte NEW_LINE = (byte)'\n'; + + + /** Preferred encoding. */ + private final static String PREFERRED_ENCODING = "UTF-8"; + + + /** The 64 valid Base64 values. */ + private final static byte[] ALPHABET; + private final static byte[] _NATIVE_ALPHABET = /* May be something funny like EBCDIC */ + { + (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)'/' + }; + + /** Determine which ALPHABET to use. */ + static + { + byte[] __bytes; + try + { + __bytes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".getBytes( PREFERRED_ENCODING ); + } // end try + catch (java.io.UnsupportedEncodingException use) + { + __bytes = _NATIVE_ALPHABET; // Fall back to native encoding + } // end catch + ALPHABET = __bytes; + } // end static + + + /** + * Translates a Base64 value to either its 6-bit reconstruction value + * or a negative number indicating some other meaning. + **/ + private final static byte[] 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 */ + }; + + // I think I end up not using the BAD_ENCODING indicator. + //private final static byte BAD_ENCODING = -9; // Indicates error in encoding + private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding + private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding + + + /** Defeats instantiation. */ + private Base64(){} + + + +/* ******** 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 ) + { + encode3to4( threeBytes, 0, numSigBytes, b4, 0 ); + return b4; + } // end encode3to4 + + + /** + * 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>. + * + * @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 ) + { + // 1 2 3 + // 01234567890123456789012345678901 Bit position + // --------000000001111111122222222 Array position from threeBytes + // --------| || || || | Six bit groups to index ALPHABET + // >>18 >>12 >> 6 >> 0 Right shift necessary + // 0x3f 0x3f 0x3f Additional AND + + // Create buffer with zero-padding if there are only one or two + // significant bytes passed in the array. + // We have to shift left 24 in order to flush out the 1's that appear + // when Java treats a value as negative that is cast from a byte to an int. + int inBuff = ( numSigBytes > 0 ? ((source[ srcOffset ] << 24) >>> 8) : 0 ) + | ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 ) + | ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 ); + + switch( numSigBytes ) + { + case 3: + destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ]; + destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; + destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ]; + destination[ destOffset + 3 ] = ALPHABET[ (inBuff ) & 0x3f ]; + return destination; + + case 2: + destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ]; + destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; + destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ]; + destination[ destOffset + 3 ] = EQUALS_SIGN; + return destination; + + case 1: + destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ]; + destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; + destination[ destOffset + 2 ] = EQUALS_SIGN; + destination[ destOffset + 3 ] = EQUALS_SIGN; + return destination; + + default: + return destination; + } // end switch + } // end encode3to4 + + + + /** + * Serializes an object and returns the Base64-encoded + * version of that serialized object. If the object + * cannot be serialized or there is another error, + * the method will return <tt>null</tt>. + * The object is not GZip-compressed before being encoded. + * + * @param serializableObject The object to encode + * @return The Base64-encoded object + * @since 1.4 + */ + public static String encodeObject( java.io.Serializable serializableObject ) + { + return encodeObject( serializableObject, NO_OPTIONS ); + } // end encodeObject + + + + /** + * Serializes an object and returns the Base64-encoded + * version of that serialized object. If the object + * cannot be serialized or there is another error, + * the method will return <tt>null</tt>. + * <p> + * Valid options:<pre> + * GZIP: gzip-compresses object before encoding it. + * DONT_BREAK_LINES: don't break lines at 76 characters + * <i>Note: Technically, this makes your encoding non-compliant.</i> + * </pre> + * <p> + * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or + * <p> + * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> + * + * @param serializableObject The object to encode + * @param options Specified options + * @return The Base64-encoded object + * @see Base64#GZIP + * @see Base64#DONT_BREAK_LINES + * @since 2.0 + */ + public static String encodeObject( java.io.Serializable serializableObject, int options ) + { + // Streams + java.io.ByteArrayOutputStream baos = null; + java.io.OutputStream b64os = null; + java.io.ObjectOutputStream oos = null; + java.util.zip.GZIPOutputStream gzos = null; + + // Isolate options + int gzip = (options & GZIP); + int dontBreakLines = (options & DONT_BREAK_LINES); + + try + { + // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream + baos = new java.io.ByteArrayOutputStream(); + b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines ); + + // GZip? + if( gzip == GZIP ) + { + gzos = new java.util.zip.GZIPOutputStream( b64os ); + oos = new java.io.ObjectOutputStream( gzos ); + } // end if: gzip + else + oos = new java.io.ObjectOutputStream( b64os ); + + oos.writeObject( serializableObject ); + } // end try + catch( java.io.IOException e ) + { + e.printStackTrace(); + return null; + } // end catch + finally + { + try{ oos.close(); } catch( Exception e ){} + try{ gzos.close(); } catch( Exception e ){} + try{ b64os.close(); } catch( Exception e ){} + try{ baos.close(); } catch( Exception e ){} + } // end finally + + // Return value according to relevant encoding. + try + { + return new String( baos.toByteArray(), PREFERRED_ENCODING ); + } // end try + catch (java.io.UnsupportedEncodingException uue) + { + return new String( baos.toByteArray() ); + } // end catch + + } // end encode + + + + /** + * Encodes a byte array into Base64 notation. + * Does not GZip-compress data. + * + * @param source The data to convert + * @since 1.4 + */ + public static String encodeBytes( byte[] source ) + { + return encodeBytes( source, 0, source.length, NO_OPTIONS ); + } // end encodeBytes + + + + /** + * Encodes a byte array into Base64 notation. + * <p> + * Valid options:<pre> + * GZIP: gzip-compresses object before encoding it. + * DONT_BREAK_LINES: don't break lines at 76 characters + * <i>Note: Technically, this makes your encoding non-compliant.</i> + * </pre> + * <p> + * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or + * <p> + * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> + * + * + * @param source The data to convert + * @param options Specified options + * @see Base64#GZIP + * @see Base64#DONT_BREAK_LINES + * @since 2.0 + */ + public static String encodeBytes( byte[] source, int options ) + { + return encodeBytes( source, 0, source.length, options ); + } // end encodeBytes + + + /** + * Encodes a byte array into Base64 notation. + * Does not GZip-compress data. + * + * @param source The data to convert + * @param off Offset in array where conversion should begin + * @param len Length of data to convert + * @since 1.4 + */ + public static String encodeBytes( byte[] source, int off, int len ) + { + return encodeBytes( source, off, len, NO_OPTIONS ); + } // end encodeBytes + + + + /** + * Encodes a byte array into Base64 notation. + * <p> + * Valid options:<pre> + * GZIP: gzip-compresses object before encoding it. + * DONT_BREAK_LINES: don't break lines at 76 characters + * <i>Note: Technically, this makes your encoding non-compliant.</i> + * </pre> + * <p> + * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or + * <p> + * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> + * + * + * @param source The data to convert + * @param off Offset in array where conversion should begin + * @param len Length of data to convert + * @param options Specified options + * @see Base64#GZIP + * @see Base64#DONT_BREAK_LINES + * @since 2.0 + */ + public static String encodeBytes( byte[] source, int off, int len, int options ) + { + // Isolate options + int dontBreakLines = ( options & DONT_BREAK_LINES ); + int gzip = ( options & GZIP ); + + // Compress? + if( gzip == GZIP ) + { + java.io.ByteArrayOutputStream baos = null; + java.util.zip.GZIPOutputStream gzos = null; + Base64.OutputStream b64os = null; + + + try + { + // GZip -> Base64 -> ByteArray + baos = new java.io.ByteArrayOutputStream(); + b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines ); + gzos = new java.util.zip.GZIPOutputStream( b64os ); + + gzos.write( source, off, len ); + gzos.close(); + } // end try + catch( java.io.IOException e ) + { + e.printStackTrace(); + return null; + } // end catch + finally + { + try{ gzos.close(); } catch( Exception e ){} + try{ b64os.close(); } catch( Exception e ){} + try{ baos.close(); } catch( Exception e ){} + } // end finally + + // Return value according to relevant encoding. + try + { + return new String( baos.toByteArray(), PREFERRED_ENCODING ); + } // end try + catch (java.io.UnsupportedEncodingException uue) + { + return new String( baos.toByteArray() ); + } // end catch + } // end if: compress + + // Else, don't compress. Better not to use streams at all then. + else + { + // Convert option to boolean in way that code likes it. + boolean breakLines = dontBreakLines == 0; + + int len43 = len * 4 / 3; + byte[] outBuff = new byte[ ( len43 ) // Main 4:3 + + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding + + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines + int d = 0; + int e = 0; + int len2 = len - 2; + int lineLength = 0; + for( ; d < len2; d+=3, e+=4 ) + { + encode3to4( source, d+off, 3, outBuff, e ); + + 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 ); + e += 4; + } // end if: some padding needed + + + // Return value according to relevant encoding. + try + { + return new String( outBuff, 0, e, PREFERRED_ENCODING ); + } // end try + catch (java.io.UnsupportedEncodingException uue) + { + return new String( outBuff, 0, e ); + } // end catch + + } // end else: don't compress + + } // end encodeBytes + + + + + +/* ******** D E C O D I N G M E T H O D S ******** */ + + + /** + * Decodes four bytes from array <var>source</var> + * and writes the resulting bytes (up to three of them) + * to <var>destination</var>. + * The source and destination arrays can be manipulated + * anywhere along their length by specifying + * <var>srcOffset</var> and <var>destOffset</var>. + * This method does not check to make sure your arrays + * are large enough to accomodate <var>srcOffset</var> + 4 for + * the <var>source</var> array or <var>destOffset</var> + 3 for + * the <var>destination</var> array. + * This method returns the actual number of bytes that + * were converted from the Base64 encoding. + * + * + * @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 + * @return the number of decoded bytes converted + * @since 1.3 + */ + private static int decode4to3( byte[] source, int srcOffset, byte[] destination, int destOffset ) + { + // Example: Dk== + if( source[ srcOffset + 2] == EQUALS_SIGN ) + { + // Two ways to do the same thing. Don't know which way I like best. + //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) + // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 ); + int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 ) + | ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 ); + + destination[ destOffset ] = (byte)( outBuff >>> 16 ); + return 1; + } + + // Example: DkL= + else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) + { + // Two ways to do the same thing. Don't know which way I like best. + //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) + // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) + // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ); + int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 ) + | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 ) + | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6 ); + + destination[ destOffset ] = (byte)( outBuff >>> 16 ); + destination[ destOffset + 1 ] = (byte)( outBuff >>> 8 ); + return 2; + } + + // Example: DkLE + else + { + try{ + // Two ways to do the same thing. Don't know which way I like best. + //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) + // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) + // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ) + // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 ); + int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 ) + | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 ) + | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6) + | ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF ) ); + + + destination[ destOffset ] = (byte)( outBuff >> 16 ); + destination[ destOffset + 1 ] = (byte)( outBuff >> 8 ); + destination[ destOffset + 2 ] = (byte)( outBuff ); + + return 3; + }catch( Exception e){ + System.out.println(""+source[srcOffset]+ ": " + ( DECODABET[ source[ srcOffset ] ] ) ); + System.out.println(""+source[srcOffset+1]+ ": " + ( DECODABET[ source[ srcOffset + 1 ] ] ) ); + System.out.println(""+source[srcOffset+2]+ ": " + ( DECODABET[ source[ srcOffset + 2 ] ] ) ); + System.out.println(""+source[srcOffset+3]+ ": " + ( DECODABET[ source[ srcOffset + 3 ] ] ) ); + return -1; + } //e nd catch + } + } // end decodeToBytes + + + + + /** + * Very low-level access to decoding ASCII characters in + * the form of a byte array. Does not support automatically + * gunzipping or any other "fancy" features. + * + * @param source The Base64 encoded data + * @param off The offset of where to begin decoding + * @param len The length of characters to decode + * @return decoded data + * @since 1.3 + */ + public static byte[] decode( byte[] source, int off, int len ) + { + int len34 = len * 3 / 4; + byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output + int outBuffPosn = 0; + + byte[] b4 = new byte[4]; + int b4Posn = 0; + int i = 0; + byte sbiCrop = 0; + byte sbiDecode = 0; + for( i = off; i < off+len; i++ ) + { + sbiCrop = (byte)(source[i] & 0x7f); // Only the low seven bits + sbiDecode = DECODABET[ sbiCrop ]; + + if( sbiDecode >= WHITE_SPACE_ENC ) // White space, Equals sign or better + { + if( sbiDecode >= EQUALS_SIGN_ENC ) + { + b4[ b4Posn++ ] = sbiCrop; + if( b4Posn > 3 ) + { + outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn ); + b4Posn = 0; + + // If that was the equals sign, break out of 'for' loop + if( sbiCrop == EQUALS_SIGN ) + break; + } // end if: quartet built + + } // end if: equals sign or better + + } // end if: white space, equals sign or better + else + { + System.err.println( "Bad Base64 input character at " + i + ": " + source[i] + "(decimal)" ); + return null; + } // end else: + } // each input character + + byte[] out = new byte[ outBuffPosn ]; + System.arraycopy( outBuff, 0, out, 0, outBuffPosn ); + return out; + } // end decode + + + + + /** + * Decodes data from Base64 notation, automatically + * detecting gzip-compressed data and decompressing it. + * + * @param s the string to decode + * @return the decoded data + * @since 1.4 + */ + public static byte[] decode( String s ) + { + 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 ); + + + // Check to see if it's gzip-compressed + // GZIP Magic Two-Byte Number: 0x8b1f (35615) + if( bytes != null && bytes.length >= 4 ) + { + + int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00); + if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head ) + { + java.io.ByteArrayInputStream bais = null; + java.util.zip.GZIPInputStream gzis = null; + java.io.ByteArrayOutputStream baos = null; + byte[] buffer = new byte[2048]; + int length = 0; + + try + { + baos = new java.io.ByteArrayOutputStream(); + bais = new java.io.ByteArrayInputStream( bytes ); + gzis = new java.util.zip.GZIPInputStream( bais ); + + while( ( length = gzis.read( buffer ) ) >= 0 ) + { + baos.write(buffer,0,length); + } // end while: reading input + + // No error? Get new bytes. + bytes = baos.toByteArray(); + + } // end try + catch( java.io.IOException e ) + { + // Just return originally-decoded bytes + } // end catch + finally + { + try{ baos.close(); } catch( Exception e ){} + try{ gzis.close(); } catch( Exception e ){} + try{ bais.close(); } catch( Exception e ){} + } // end finally + + } // end if: gzipped + } // end if: bytes.length >= 2 + + return bytes; + } // end decode + + + + + /** + * Attempts to decode Base64 data and deserialize a Java + * Object within. Returns <tt>null</tt> if there was an error. + * + * @param encodedObject The Base64 data to decode + * @return The decoded and deserialized object + * @since 1.5 + */ + public static Object decodeToObject( String encodedObject ) + { + // Decode and gunzip if necessary + byte[] objBytes = decode( encodedObject ); + + java.io.ByteArrayInputStream bais = null; + java.io.ObjectInputStream ois = null; + Object obj = null; + + try + { + bais = new java.io.ByteArrayInputStream( objBytes ); + ois = new java.io.ObjectInputStream( bais ); + + obj = ois.readObject(); + } // end try + catch( java.io.IOException e ) + { + e.printStackTrace(); + obj = null; + } // end catch + catch( java.lang.ClassNotFoundException e ) + { + e.printStackTrace(); + obj = null; + } // end catch + finally + { + try{ bais.close(); } catch( Exception e ){} + try{ ois.close(); } catch( Exception e ){} + } // end finally + + return obj; + } // end decodeObject + + + + /** + * Convenience method for encoding data to a file. + * + * @param dataToEncode byte array of data to encode in base64 form + * @param filename Filename for saving encoded data + * @return <tt>true</tt> if successful, <tt>false</tt> otherwise + * + * @since 2.1 + */ + public static boolean encodeToFile( byte[] dataToEncode, String filename ) + { + boolean success = false; + Base64.OutputStream bos = null; + try + { + bos = new Base64.OutputStream( + new java.io.FileOutputStream( filename ), Base64.ENCODE ); + bos.write( dataToEncode ); + success = true; + } // end try + catch( java.io.IOException e ) + { + + success = false; + } // end catch: IOException + finally + { + try{ bos.close(); } catch( Exception e ){} + } // end finally + + return success; + } // end encodeToFile + + + /** + * Convenience method for decoding data to a file. + * + * @param dataToDecode Base64-encoded data as a string + * @param filename Filename for saving decoded data + * @return <tt>true</tt> if successful, <tt>false</tt> otherwise + * + * @since 2.1 + */ + public static boolean decodeToFile( String dataToDecode, String filename ) + { + boolean success = false; + Base64.OutputStream bos = null; + try + { + bos = new Base64.OutputStream( + new java.io.FileOutputStream( filename ), Base64.DECODE ); + bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) ); + success = true; + } // end try + catch( java.io.IOException e ) + { + success = false; + } // end catch: IOException + finally + { + try{ bos.close(); } catch( Exception e ){} + } // end finally + + return success; + } // end decodeToFile + + + + + /** + * Convenience method for reading a base64-encoded + * file and decoding it. + * + * @param filename Filename for reading encoded data + * @return decoded byte array or null if unsuccessful + * + * @since 2.1 + */ + public static byte[] decodeFromFile( String filename ) + { + byte[] decodedData = null; + Base64.InputStream bis = null; + try + { + // Set up some useful variables + java.io.File file = new java.io.File( filename ); + byte[] buffer = null; + int length = 0; + int numBytes = 0; + + // Check for size of file + if( file.length() > Integer.MAX_VALUE ) + { + System.err.println( "File is too big for this convenience method (" + file.length() + " bytes)." ); + return null; + } // end if: file too big for int index + buffer = new byte[ (int)file.length() ]; + + // Open a stream + bis = new Base64.InputStream( + new java.io.BufferedInputStream( + new java.io.FileInputStream( file ) ), Base64.DECODE ); + + // Read until done + while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) + length += numBytes; + + // Save in a variable to return + decodedData = new byte[ length ]; + System.arraycopy( buffer, 0, decodedData, 0, length ); + + } // end try + catch( java.io.IOException e ) + { + System.err.println( "Error decoding from file " + filename ); + } // end catch: IOException + finally + { + try{ bis.close(); } catch( Exception e) {} + } // end finally + + return decodedData; + } // end decodeFromFile + + + + /** + * Convenience method for reading a binary file + * and base64-encoding it. + * + * @param filename Filename for reading binary data + * @return base64-encoded string or null if unsuccessful + * + * @since 2.1 + */ + public static String encodeFromFile( String filename ) + { + String encodedData = null; + Base64.InputStream bis = null; + try + { + // Set up some useful variables + java.io.File file = new java.io.File( filename ); + byte[] buffer = new byte[ (int)(file.length() * 1.4) ]; + int length = 0; + int numBytes = 0; + + // Open a stream + bis = new Base64.InputStream( + new java.io.BufferedInputStream( + new java.io.FileInputStream( file ) ), Base64.ENCODE ); + + // Read until done + while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) + length += numBytes; + + // Save in a variable to return + encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING ); + + } // end try + catch( java.io.IOException e ) + { + System.err.println( "Error encoding from file " + filename ); + } // end catch: IOException + finally + { + try{ bis.close(); } catch( Exception e) {} + } // end finally + + return encodedData; + } // end encodeFromFile + + + + + /* ******** 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 + + + /** + * Constructs a {@link Base64.InputStream} in DECODE mode. + * + * @param in the <tt>java.io.InputStream</tt> from which to read data. + * @since 1.3 + */ + public InputStream( java.io.InputStream in ) + { + this( in, DECODE ); + } // end constructor + + + /** + * Constructs a {@link Base64.InputStream} in + * either ENCODE or DECODE mode. + * <p> + * Valid options:<pre> + * ENCODE or DECODE: Encode or Decode as data is read. + * DONT_BREAK_LINES: don't break lines at 76 characters + * (only meaningful when encoding) + * <i>Note: Technically, this makes your encoding non-compliant.</i> + * </pre> + * <p> + * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code> + * + * + * @param in the <tt>java.io.InputStream</tt> from which to read data. + * @param options Specified options + * @see Base64#ENCODE + * @see Base64#DECODE + * @see Base64#DONT_BREAK_LINES + * @since 2.0 + */ + public InputStream( java.io.InputStream in, int options ) + { + super( in ); + this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES; + this.encode = (options & ENCODE) == ENCODE; + this.bufferLength = encode ? 4 : 3; + this.buffer = new byte[ bufferLength ]; + this.position = -1; + this.lineLength = 0; + } // end constructor + + /** + * Reads enough of the input stream to convert + * to/from Base64 and returns the next byte. + * + * @return next byte + * @since 1.3 + */ + public int read() throws java.io.IOException + { + // Do we need to get data? + if( position < 0 ) + { + if( encode ) + { + byte[] b3 = new byte[3]; + int numBinaryBytes = 0; + for( int i = 0; i < 3; i++ ) + { + try + { + int b = in.read(); + + // If end of stream, b is -1. + if( b >= 0 ) + { + b3[i] = (byte)b; + numBinaryBytes++; + } // end if: not end of stream + + } // end try: read + catch( java.io.IOException e ) + { + // Only a problem if we got no data at all. + if( i == 0 ) + throw e; + + } // end catch + } // end for: each needed input byte + + if( numBinaryBytes > 0 ) + { + encode3to4( b3, 0, numBinaryBytes, buffer, 0 ); + position = 0; + numSigBytes = 4; + } // end if: got data + else + { + return -1; + } // end else + } // end if: encoding + + // Else decoding + else + { + byte[] b4 = new byte[4]; + int i = 0; + for( i = 0; i < 4; i++ ) + { + // Read four "meaningful" bytes: + int b = 0; + do{ b = in.read(); } + while( b >= 0 && DECODABET[ b & 0x7f ] <= WHITE_SPACE_ENC ); + + if( b < 0 ) + break; // Reads a -1 if end of stream + + b4[i] = (byte)b; + } // end for: each needed input byte + + if( i == 4 ) + { + numSigBytes = decode4to3( b4, 0, buffer, 0 ); + position = 0; + } // end if: got four characters + else if( i == 0 ){ + return -1; + } // end else if: also padded correctly + else + { + // Must have broken out from above. + throw new java.io.IOException( "Improperly padded Base64 input." ); + } // end + + } // end else: decode + } // end else: get data + + // Got data? + if( position >= 0 ) + { + // End of relevant data? + if( /*!encode &&*/ position >= numSigBytes ) + return -1; + + if( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) + { + lineLength = 0; + return '\n'; + } // end if + else + { + lineLength++; // This isn't important when decoding + // but throwing an extra "if" seems + // just as wasteful. + + int b = buffer[ position++ ]; + + if( position >= bufferLength ) + position = -1; + + return b & 0xFF; // This is how you "cast" a byte that's + // intended to be unsigned. + } // end else + } // end if: position >= 0 + + // Else error + else + { + // When JDK1.4 is more accepted, use an assertion here. + throw new java.io.IOException( "Error in Base64 code reading stream." ); + } // end else + } // end read + + + /** + * Calls {@link #read()} repeatedly until the end of stream + * is reached or <var>len</var> bytes are read. + * Returns number of bytes read into array or -1 if + * end of stream is encountered. + * + * @param dest array to hold values + * @param off offset for array + * @param len max number of bytes to read into array + * @return bytes read into array or -1 if end of stream is encountered. + * @since 1.3 + */ + public int read( byte[] dest, int off, int len ) throws java.io.IOException + { + int i; + int b; + for( i = 0; i < len; i++ ) + { + b = read(); + + //if( b < 0 && i == 0 ) + // return -1; + + if( b >= 0 ) + dest[off + i] = (byte)b; + else if( i == 0 ) + return -1; + else + break; // Out of 'for' loop + } // end for: each byte read + return i; + } // end read + + } // end inner class InputStream + + + + + + + /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */ + + + + /** + * A {@link Base64.OutputStream} will write data to another + * <tt>java.io.OutputStream</tt>, given in the constructor, + * and encode/decode to/from Base64 notation on the fly. + * + * @see Base64 + * @since 1.3 + */ + public static class OutputStream extends java.io.FilterOutputStream + { + private boolean encode; + private int position; + private byte[] buffer; + private int bufferLength; + private int lineLength; + private boolean breakLines; + private byte[] b4; // Scratch used in a few places + private boolean suspendEncoding; + + /** + * Constructs a {@link Base64.OutputStream} in ENCODE mode. + * + * @param out the <tt>java.io.OutputStream</tt> to which data will be written. + * @since 1.3 + */ + public OutputStream( java.io.OutputStream out ) + { + this( out, ENCODE ); + } // end constructor + + + /** + * Constructs a {@link Base64.OutputStream} in + * either ENCODE or DECODE mode. + * <p> + * Valid options:<pre> + * ENCODE or DECODE: Encode or Decode as data is read. + * DONT_BREAK_LINES: don't break lines at 76 characters + * (only meaningful when encoding) + * <i>Note: Technically, this makes your encoding non-compliant.</i> + * </pre> + * <p> + * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code> + * + * @param out the <tt>java.io.OutputStream</tt> to which data will be written. + * @param options Specified options. + * @see Base64#ENCODE + * @see Base64#DECODE + * @see Base64#DONT_BREAK_LINES + * @since 1.3 + */ + public OutputStream( java.io.OutputStream out, int options ) + { + super( out ); + this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES; + this.encode = (options & ENCODE) == ENCODE; + this.bufferLength = encode ? 3 : 4; + this.buffer = new byte[ bufferLength ]; + this.position = 0; + this.lineLength = 0; + this.suspendEncoding = false; + this.b4 = new byte[4]; + } // end constructor + + + /** + * Writes the byte to the output stream after + * converting to/from Base64 notation. + * When encoding, bytes are buffered three + * at a time before the output stream actually + * gets a write() call. + * When decoding, bytes are buffered four + * at a time. + * + * @param theByte the byte to write + * @since 1.3 + */ + public void write(int theByte) throws java.io.IOException + { + // Encoding suspended? + if( suspendEncoding ) + { + super.out.write( theByte ); + return; + } // end if: supsended + + // Encode? + if( encode ) + { + buffer[ position++ ] = (byte)theByte; + if( position >= bufferLength ) // Enough to encode. + { + out.write( encode3to4( b4, buffer, bufferLength ) ); + + lineLength += 4; + if( breakLines && lineLength >= MAX_LINE_LENGTH ) + { + out.write( NEW_LINE ); + lineLength = 0; + } // end if: end of line + + position = 0; + } // end if: enough to output + } // end if: encoding + + // Else, Decoding + else + { + // Meaningful Base64 character? + if( DECODABET[ theByte & 0x7f ] > WHITE_SPACE_ENC ) + { + buffer[ position++ ] = (byte)theByte; + if( position >= bufferLength ) // Enough to output. + { + int len = Base64.decode4to3( buffer, 0, b4, 0 ); + out.write( b4, 0, len ); + //out.write( Base64.decode4to3( buffer ) ); + position = 0; + } // end if: enough to output + } // end if: meaningful base64 character + else if( DECODABET[ theByte & 0x7f ] != WHITE_SPACE_ENC ) + { + throw new java.io.IOException( "Invalid character in Base64 data." ); + } // end else: not white space either + } // end else: decoding + } // end write + + + + /** + * Calls {@link #write(int)} repeatedly until <var>len</var> + * bytes are written. + * + * @param theBytes array from which to read bytes + * @param off offset for array + * @param len max number of bytes to read into array + * @since 1.3 + */ + public void write( byte[] theBytes, int off, int len ) throws java.io.IOException + { + // Encoding suspended? + if( suspendEncoding ) + { + super.out.write( theBytes, off, len ); + return; + } // end if: supsended + + for( int i = 0; i < len; i++ ) + { + write( theBytes[ off + i ] ); + } // end for: each byte written + + } // end write + + + + /** + * Method added by PHIL. [Thanks, PHIL. -Rob] + * This pads the buffer without closing the stream. + */ + public void flushBase64() throws java.io.IOException + { + if( position > 0 ) + { + if( encode ) + { + out.write( encode3to4( b4, buffer, position ) ); + position = 0; + } // end if: encoding + else + { + throw new java.io.IOException( "Base64 input not properly padded." ); + } // end else: decoding + } // end if: buffer partially full + + } // end flush + + + /** + * Flushes and closes (I think, in the superclass) the stream. + * + * @since 1.3 + */ + public void close() throws java.io.IOException + { + // 1. Ensure that pending characters are written + flushBase64(); + + // 2. Actually close the stream + // Base class both flushes and closes. + super.close(); + + buffer = null; + out = null; + } // end close + + + + /** + * Suspends encoding of the stream. + * May be helpful if you need to embed a piece of + * base640-encoded data in a stream. + * + * @since 1.5.1 + */ + public void suspendEncoding() throws java.io.IOException + { + flushBase64(); + this.suspendEncoding = true; + } // end suspendEncoding + + + /** + * Resumes encoding of the stream. + * May be helpful if you need to embed a piece of + * base640-encoded data in a stream. + * + * @since 1.5.1 + */ + public void resumeEncoding() + { + this.suspendEncoding = false; + } // end resumeEncoding + + + + } // end inner class OutputStream + + +} // end class Base64 -- 1.5.6.74.g8a5e -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
