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package org.vrmoo.common.util;
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import java.util.ArrayList;
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import java.util.List;
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public class Base64Utility
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{
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private static final boolean USE_NEWLINES = false;
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private static List base64Lookup;
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static
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{
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base64Lookup = new ArrayList( );
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base64Lookup.add( new Character( 'A' ) );
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base64Lookup.add( new Character( 'B' ) );
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base64Lookup.add( new Character( 'C' ) );
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base64Lookup.add( new Character( 'D' ) );
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base64Lookup.add( new Character( 'E' ) );
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base64Lookup.add( new Character( 'F' ) );
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base64Lookup.add( new Character( 'G' ) );
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base64Lookup.add( new Character( 'H' ) );
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base64Lookup.add( new Character( 'I' ) );
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base64Lookup.add( new Character( 'J' ) );
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base64Lookup.add( new Character( 'K' ) );
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base64Lookup.add( new Character( 'L' ) );
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base64Lookup.add( new Character( 'M' ) );
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base64Lookup.add( new Character( 'N' ) );
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base64Lookup.add( new Character( 'O' ) );
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base64Lookup.add( new Character( 'P' ) );
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base64Lookup.add( new Character( 'Q' ) );
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base64Lookup.add( new Character( 'R' ) );
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base64Lookup.add( new Character( 'S' ) );
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base64Lookup.add( new Character( 'T' ) );
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base64Lookup.add( new Character( 'U' ) );
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base64Lookup.add( new Character( 'V' ) );
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base64Lookup.add( new Character( 'W' ) );
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base64Lookup.add( new Character( 'X' ) );
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base64Lookup.add( new Character( 'Y' ) );
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base64Lookup.add( new Character( 'Z' ) );
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base64Lookup.add( new Character( 'a' ) );
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base64Lookup.add( new Character( 'b' ) );
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base64Lookup.add( new Character( 'c' ) );
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base64Lookup.add( new Character( 'd' ) );
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base64Lookup.add( new Character( 'e' ) );
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base64Lookup.add( new Character( 'f' ) );
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base64Lookup.add( new Character( 'g' ) );
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base64Lookup.add( new Character( 'h' ) );
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base64Lookup.add( new Character( 'i' ) );
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base64Lookup.add( new Character( 'j' ) );
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base64Lookup.add( new Character( 'k' ) );
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base64Lookup.add( new Character( 'l' ) );
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base64Lookup.add( new Character( 'm' ) );
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base64Lookup.add( new Character( 'n' ) );
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base64Lookup.add( new Character( 'o' ) );
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base64Lookup.add( new Character( 'p' ) );
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base64Lookup.add( new Character( 'q' ) );
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base64Lookup.add( new Character( 'r' ) );
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base64Lookup.add( new Character( 's' ) );
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base64Lookup.add( new Character( 't' ) );
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base64Lookup.add( new Character( 'u' ) );
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base64Lookup.add( new Character( 'v' ) );
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base64Lookup.add( new Character( 'w' ) );
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base64Lookup.add( new Character( 'x' ) );
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base64Lookup.add( new Character( 'y' ) );
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base64Lookup.add( new Character( 'z' ) );
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base64Lookup.add( new Character( '0' ) );
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base64Lookup.add( new Character( '1' ) );
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base64Lookup.add( new Character( '2' ) );
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base64Lookup.add( new Character( '3' ) );
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base64Lookup.add( new Character( '4' ) );
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base64Lookup.add( new Character( '5' ) );
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base64Lookup.add( new Character( '6' ) );
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base64Lookup.add( new Character( '7' ) );
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base64Lookup.add( new Character( '8' ) );
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base64Lookup.add( new Character( '9' ) );
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base64Lookup.add( new Character( '+' ) );
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base64Lookup.add( new Character( '/' ) );
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}
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private Base64Utility( )
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{
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}
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public static byte[ ] toBinary( String base64 )
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{
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if ( base64.length( ) % 4 != 0 )
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{
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throw new IllegalArgumentException(
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"String length is not a multiple of 4." );
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}
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List list = new ArrayList( );
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int setCount = base64.length( ) / 4;
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for ( int i = 0; i < setCount; i++ )
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{
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char c1 = base64.charAt( ( i * 4 ) + 0 );
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char c2 = base64.charAt( ( i * 4 ) + 1 );
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char c3 = base64.charAt( ( i * 4 ) + 2 );
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char c4 = base64.charAt( ( i * 4 ) + 3 );
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byte b1 = toBase64Byte( c1 );
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byte b2 = toBase64Byte( c2 );
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byte b3 = toBase64Byte( c3 );
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byte b4 = toBase64Byte( c4 );
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list.add( new Byte( ( byte ) ( ( ( b1 & 0x3F ) << 2 ) |
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( ( b2 & 0x30 ) >> 4 ) ) ) );
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if ( c3 != '=' )
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{
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list.add( new Byte( ( byte ) ( ( ( b2 & 0x0F ) << 4 ) |
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( ( b3 & 0x3C ) >> 2 ) ) ) );
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}
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if ( c4 != '=' )
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{
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list.add( new Byte( ( byte ) ( ( ( b3 & 0x03 ) << 6 ) |
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( b4 & 0x3F ) ) ) );
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}
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}
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byte[ ] dataArray = new byte[ list.size( ) ];
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for ( int i = 0; i < list.size( ); i++ )
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{
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dataArray[ i ] = ( ( Byte ) list.get( i ) ).byteValue( );
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}
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return dataArray;
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}
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public static String toBase64( byte[ ] data )
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{
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StringBuffer buf = new StringBuffer( );
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int setCount = data.length / 3;
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int remainder = data.length % 3;
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for ( int i = 0; i < setCount; i++ )
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{
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0
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if ( ( i % 15 == 0 ) && ( i != 0 ) && ( USE_NEWLINES ) )
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{
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buf.append( "\r\n" );
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}
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byte b1 = ( byte ) ( ( data[ ( i * 3 ) ] & 0xFC ) >> 2 );
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byte b2 = ( byte ) ( ( ( data[ ( i * 3 ) ] & 0x03 ) << 4 ) |
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( ( data[ ( i * 3 ) + 1 ] & 0xF0 ) >> 4 ) );
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byte b3 = ( byte ) ( ( ( data[ ( i * 3 ) + 1 ] & 0x0F ) << 2 ) |
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( ( data[ ( i * 3 ) + 2 ] & 0xC0 ) >> 6 ) );
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byte b4 = ( byte ) ( data[ ( i * 3 ) + 2 ] & 0x3F );
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buf.append( toBase64Character( b1 ) );
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buf.append( toBase64Character( b2 ) );
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buf.append( toBase64Character( b3 ) );
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buf.append( toBase64Character( b4 ) );
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}
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0
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if ( ( remainder > 0 ) &&
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( setCount % 15 == 0 ) &&
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( setCount > 0 ) &&
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( USE_NEWLINES ) )
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{
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0
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buf.append( "\r\n" );
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}
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0
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if ( remainder == 2 )
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{
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0
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byte b1 = ( byte ) ( ( data[ data.length - 2 ] & 0xFC ) >> 2 );
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0
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byte b2 = ( byte ) ( ( ( data[ data.length - 2 ] & 0x03 ) << 4 ) |
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( ( data[ data.length - 1 ] & 0xF0 ) >> 4 ) );
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0
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byte b3 = ( byte ) ( ( data[ data.length - 1 ] & 0x0F ) << 2 );
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buf.append( toBase64Character( b1 ) );
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buf.append( toBase64Character( b2 ) );
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buf.append( toBase64Character( b3 ) );
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buf.append( "=" );
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}
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0
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else if ( remainder == 1 )
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{
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0
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byte b1 = ( byte ) ( ( data[ data.length - 1 ] & 0xFC ) >> 2 );
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0
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byte b2 = ( byte ) ( ( data[ data.length - 1 ] & 0x03 ) << 4 );
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238
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239
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0
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buf.append( toBase64Character( b1 ) );
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buf.append( toBase64Character( b2 ) );
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0
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buf.append( "==" );
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}
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return buf.toString( );
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}
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249
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252
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253
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254
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0
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private static char toBase64Character( byte b )
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{
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return ( ( Character ) base64Lookup.get( b ) ).charValue( );
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}
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259
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260
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261
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262
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263
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264
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265
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266
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0
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private static byte toBase64Byte( char c )
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267
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{
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268
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0
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if ( c == '=' )
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269
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{
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270
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0
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return 0;
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271
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}
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272
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0
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return ( byte ) base64Lookup.indexOf( new Character( c ) );
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273
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}
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274
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}
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275
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