//
-// 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:
+// NOTE: The following source code is heavily derived from the
+// iHarder.net public domain Base64 library. See the original at
// http://iharder.sourceforge.net/current/java/base64/
//
package org.eclipse.jgit.util;
+import java.io.UnsupportedEncodingException;
import java.text.MessageFormat;
+import java.util.Arrays;
import org.eclipse.jgit.JGitText;
* @author rob@iharder.net
* @version 2.1, stripped to minimum feature set used by JGit.
*/
-public class Base64
-{
-/* ******** P R I V A T E F I E L D S ******** */
-
- /** The equals sign (=) as a byte. */
- private final static byte EQUALS_SIGN = (byte)'=';
-
-
- /** 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() {
- //suppress empty block warning
- }
-
- /**
- * 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 accommodate <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
-
- /**
- * Encodes a byte array into Base64 notation.
- *
- * @param source The data to convert
- * @return encoded base64 representation of source.
- * @since 1.4
- */
- public static String encodeBytes( byte[] source )
- {
+public class Base64 {
+ /** The equals sign (=) as a byte. */
+ private final static byte EQUALS_SIGN = (byte) '=';
+
+ /** Indicates equals sign in encoding. */
+ private final static byte EQUALS_SIGN_DEC = -1;
+
+ /** Indicates white space in encoding. */
+ private final static byte WHITE_SPACE_DEC = -2;
+
+ /** Indicates an invalid byte during decoding. */
+ private final static byte INVALID_DEC = -3;
+
+ /** Preferred encoding. */
+ private final static String UTF_8 = "UTF-8";
+
+ /** The 64 valid Base64 values. */
+ private final static byte[] ENC;
+
+ /**
+ * Translates a Base64 value to either its 6-bit reconstruction value or a
+ * negative number indicating some other meaning. The table is only 7 bits
+ * wide, as the 8th bit is discarded during decoding.
+ */
+ private final static byte[] DEC;
+
+ static {
+ try {
+ ENC = ("ABCDEFGHIJKLMNOPQRSTUVWXYZ" //
+ + "abcdefghijklmnopqrstuvwxyz" //
+ + "0123456789" //
+ + "+/" //
+ ).getBytes(UTF_8);
+ } catch (UnsupportedEncodingException uee) {
+ throw new RuntimeException(uee.getMessage(), uee);
+ }
+
+ DEC = new byte[128];
+ Arrays.fill(DEC, INVALID_DEC);
+
+ for (int i = 0; i < 64; i++)
+ DEC[ENC[i]] = (byte) i;
+ DEC[EQUALS_SIGN] = EQUALS_SIGN_DEC;
+
+ DEC['\t'] = WHITE_SPACE_DEC;
+ DEC['\n'] = WHITE_SPACE_DEC;
+ DEC['\r'] = WHITE_SPACE_DEC;
+ DEC[' '] = WHITE_SPACE_DEC;
+ }
+
+ /** Defeats instantiation. */
+ private Base64() {
+ // Suppress empty block warning.
+ }
+
+ /**
+ * 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 accommodate
+ * <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
+ */
+ private static void encode3to4(byte[] source, int srcOffset,
+ int numSigBytes, byte[] destination, int destOffset) {
+ // 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.
+
+ int inBuff = 0;
+ switch (numSigBytes) {
+ case 3:
+ inBuff |= (source[srcOffset + 2] << 24) >>> 24;
+ //$FALL-THROUGH$
+
+ case 2:
+ inBuff |= (source[srcOffset + 1] << 24) >>> 16;
+ //$FALL-THROUGH$
+
+ case 1:
+ inBuff |= (source[srcOffset] << 24) >>> 8;
+ }
+
+ switch (numSigBytes) {
+ case 3:
+ destination[destOffset] = ENC[(inBuff >>> 18)];
+ destination[destOffset + 1] = ENC[(inBuff >>> 12) & 0x3f];
+ destination[destOffset + 2] = ENC[(inBuff >>> 6) & 0x3f];
+ destination[destOffset + 3] = ENC[(inBuff) & 0x3f];
+ break;
+
+ case 2:
+ destination[destOffset] = ENC[(inBuff >>> 18)];
+ destination[destOffset + 1] = ENC[(inBuff >>> 12) & 0x3f];
+ destination[destOffset + 2] = ENC[(inBuff >>> 6) & 0x3f];
+ destination[destOffset + 3] = EQUALS_SIGN;
+ break;
+
+ case 1:
+ destination[destOffset] = ENC[(inBuff >>> 18)];
+ destination[destOffset + 1] = ENC[(inBuff >>> 12) & 0x3f];
+ destination[destOffset + 2] = EQUALS_SIGN;
+ destination[destOffset + 3] = EQUALS_SIGN;
+ break;
+ }
+ }
+
+ /**
+ * Encodes a byte array into Base64 notation.
+ *
+ * @param source
+ * The data to convert
+ * @return encoded base64 representation of source.
+ */
+ public static String encodeBytes(byte[] source) {
return encodeBytes(source, 0, source.length);
- } // end encodeBytes
-
- /**
- * Encodes a byte array into Base64 notation.
- *
- * @param source The data to convert
- * @param off Offset in array where conversion should begin
- * @param len Length of data to convert
- * @return encoded base64 representation of source.
- * @since 1.4
- */
- public static String encodeBytes( byte[] source, int off, int len )
- {
- int len43 = len * 4 / 3;
- byte[] outBuff = new byte[ ( len43 ) // Main 4:3
- + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding
- ];
- int d = 0;
- int e = 0;
- int len2 = len - 2;
- for( ; d < len2; d+=3, e+=4 )
- {
- encode3to4( source, d+off, 3, outBuff, e );
- } // end for: 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 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 accommodate <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.
+ * Encodes a byte array into Base64 notation.
+ *
+ * @param source
+ * The data to convert
+ * @param off
+ * Offset in array where conversion should begin
+ * @param len
+ * Length of data to convert
+ * @return encoded base64 representation of source.
+ */
+ public static String encodeBytes(byte[] source, int off, int len) {
+ final int len43 = len * 4 / 3;
+
+ byte[] outBuff = new byte[len43 + ((len % 3) > 0 ? 4 : 0)];
+ int d = 0;
+ int e = 0;
+ int len2 = len - 2;
+
+ for (; d < len2; d += 3, e += 4)
+ encode3to4(source, d + off, 3, outBuff, e);
+
+ if (d < len) {
+ encode3to4(source, d + off, len - d, outBuff, e);
+ e += 4;
+ }
+
+ try {
+ return new String(outBuff, 0, e, UTF_8);
+ } catch (UnsupportedEncodingException uue) {
+ return new String(outBuff, 0, e);
+ }
+ }
+
+ /**
+ * 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 accommodate
+ * <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
+ */
+ private static int decode4to3(byte[] source, int srcOffset,
+ byte[] destination, int destOffset) {
+ // Example: Dk==
+ if (source[srcOffset + 2] == EQUALS_SIGN) {
+ int outBuff = ((DEC[source[srcOffset]] & 0xFF) << 18)
+ | ((DEC[source[srcOffset + 1]] & 0xFF) << 12);
+ destination[destOffset] = (byte) (outBuff >>> 16);
+ return 1;
+ }
+
+ // Example: DkL=
+ else if (source[srcOffset + 3] == EQUALS_SIGN) {
+ int outBuff = ((DEC[source[srcOffset]] & 0xFF) << 18)
+ | ((DEC[source[srcOffset + 1]] & 0xFF) << 12)
+ | ((DEC[source[srcOffset + 2]] & 0xFF) << 6);
+ destination[destOffset] = (byte) (outBuff >>> 16);
+ destination[destOffset + 1] = (byte) (outBuff >>> 8);
+ return 2;
+ }
+
+ // Example: DkLE
+ else {
+ int outBuff = ((DEC[source[srcOffset]] & 0xFF) << 18)
+ | ((DEC[source[srcOffset + 1]] & 0xFF) << 12)
+ | ((DEC[source[srcOffset + 2]] & 0xFF) << 6)
+ | ((DEC[source[srcOffset + 3]] & 0xFF));
+
+ destination[destOffset] = (byte) (outBuff >> 16);
+ destination[destOffset + 1] = (byte) (outBuff >> 8);
+ destination[destOffset + 2] = (byte) (outBuff);
+
+ return 3;
+ }
+ }
+
+ /**
+ * Low-level decoding ASCII characters from a byte array.
*
* @param source
* The Base64 encoded data
* @param len
* The length of characters to decode
* @return decoded data
- * @since 1.3
+ * @throws IllegalArgumentException
+ * the input is not a valid Base64 sequence.
*/
- 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(MessageFormat.format(JGitText.get().badBase64InputCharacterAt, i+ source[i]));
- return null;
- } // end else:
- } // each input character
-
- byte[] out = new byte[ outBuffPosn ];
- System.arraycopy( outBuff, 0, out, 0, outBuffPosn );
- return out;
- } // end decode
+ public static byte[] decode(byte[] source, int off, int len) {
+ byte[] outBuff = new byte[len * 3 / 4]; // Upper limit on size of output
+ int outBuffPosn = 0;
+
+ byte[] b4 = new byte[4];
+ int b4Posn = 0;
+
+ for (int i = off; i < off + len; i++) {
+ byte sbiCrop = (byte) (source[i] & 0x7f);
+ byte sbiDecode = DEC[sbiCrop];
+
+ if (EQUALS_SIGN_DEC <= sbiDecode) {
+ 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;
+ }
+
+ } else if (sbiDecode != WHITE_SPACE_DEC)
+ throw new IllegalArgumentException(MessageFormat.format(
+ JGitText.get().badBase64InputCharacterAt, i,
+ source[i] & 0xff));
+ }
+
+ if (outBuff.length == outBuffPosn)
+ return outBuff;
+
+ byte[] out = new byte[outBuffPosn];
+ System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
+ return out;
+ }
/**
* Decodes data from Base64 notation.
* @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
-
+ public static byte[] decode(String s) {
+ byte[] bytes;
+ try {
+ bytes = s.getBytes(UTF_8);
+ } catch (UnsupportedEncodingException uee) {
+ bytes = s.getBytes();
+ }
return decode(bytes, 0, bytes.length);
- } // end decode
-} // end class Base64
+ }
+}
projects / jgit.git / commitdiff