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//Copyright 2003-2009 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland //www.source-code.biz, www.inventec.ch/chdh // //This module is multi-licensed and may be used under the terms //of any of the following licenses: // //EPL, Eclipse Public License, http://www.eclipse.org/legal //LGPL, GNU Lesser General Public License, http://www.gnu.org/licenses/lgpl.html //AL, Apache License, http://www.apache.org/licenses //BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php // //Please contact the author if you need another license. //This module is provided "as is", without warranties of any kind. Home page: www.source-code.biz
Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
Multi-licensed: EPL/LGPL/AL/BSD.

Version history:
2003-07-22 Christian d'Heureuse (chdh): Module created.
2005-08-11 chdh: Lincense changed from GPL to LGPL.
2006-11-21 chdh:
  Method encode(String) renamed to encodeString(String).
  Method decode(String) renamed to decodeString(String).
  New method encode(byte[],int) added.
  New method decode(String) added.
2009-07-16: Additional licenses (EPL/AL) added.
2009-09-16: Additional license (BSD) added.
/

 
 package org.datanucleus.store.json;


A Base64 Encoder/Decoder.

This class is used to encode and decode data in Base64 format as described in RFC 1521.

 
 public class Base64
 {
 
     // Mapping table from 6-bit nibbles to Base64 characters.
     private static char[] map1 = new char[64];
     static
     {
         int i = 0;
         for (char c = 'A'c <= 'Z'c++)
             [i++] = c;
         for (char c = 'a'c <= 'z'c++)
             [i++] = c;
         for (char c = '0'c <= '9'c++)
             [i++] = c;
         [i++] = '+';
         [i++] = '/';
     }
 
     // Mapping table from Base64 characters to 6-bit nibbles.
     private static byte[] map2 = new byte[128];
     static
     {
         for (int i = 0; i < .i++)
             [i] = -1;
         for (int i = 0; i < 64; i++)
             [[i]] = (bytei;
     }

    
Encodes a string into Base64 format. No blanks or line breaks are inserted.

Parameters:
s a String to be encoded.
Returns:
A String with the Base64 encoded data.
 
     public static String encodeString(String s)
     {
         return new String(encode(s.getBytes()));
     }

    
Encodes a byte array into Base64 format. No blanks or line breaks are inserted.

Parameters:
in an array containing the data bytes to be encoded.
Returns:
A character array with the Base64 encoded data.
 
     public static char[] encode(byte[] in)
     {
         return encode(inin.length);
     }

    
Encodes a byte array into Base64 format. No blanks or line breaks are inserted.

Parameters:
in an array containing the data bytes to be encoded.
iLen number of bytes to process in in.
Returns:
A character array with the Base64 encoded data.
 
     public static char[] encode(byte[] inint iLen)
     {
         int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
         int oLen = ((iLen + 2) / 3) * 4; // output length including padding
         char[] out = new char[oLen];
        int ip = 0;
        int op = 0;
        while (ip < iLen)
        {
            int i0 = in[ip++] & 0xff;
            int i1 = ip < iLen ? in[ip++] & 0xff : 0;
            int i2 = ip < iLen ? in[ip++] & 0xff : 0;
            int o0 = i0 >>> 2;
            int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
            int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
            int o3 = i2 & 0x3F;
            out[op++] = [o0];
            out[op++] = [o1];
            out[op] = op < oDataLen ? [o2] : '=';
            op++;
            out[op] = op < oDataLen ? [o3] : '=';
            op++;
        }
        return out;
    }

    
Decodes a string from Base64 format.

Parameters:
s a Base64 String to be decoded.
Returns:
A String containing the decoded data.
Throws:
java.lang.IllegalArgumentException if the input is not valid Base64 encoded data.
    public static String decodeString(String s)
    {
        return new String(decode(s));
    }

    
Decodes a byte array from Base64 format.

Parameters:
s a Base64 String to be decoded.
Returns:
An array containing the decoded data bytes.
Throws:
java.lang.IllegalArgumentException if the input is not valid Base64 encoded data.
    public static byte[] decode(String s)
    {
        return decode(s.toCharArray());
    }

    
Decodes a byte array from Base64 format. No blanks or line breaks are allowed within the Base64 encoded data.

Parameters:
in a character array containing the Base64 encoded data.
Returns:
An array containing the decoded data bytes.
Throws:
java.lang.IllegalArgumentException if the input is not valid Base64 encoded data.
    public static byte[] decode(char[] in)
    {
        int iLen = in.length;
        if (iLen % 4 != 0)
            throw new IllegalArgumentException("Length of Base64 encoded input string is not a multiple of 4.");
        while (iLen > 0 && in[iLen - 1] == '=')
            iLen--;
        int oLen = (iLen * 3) / 4;
        byte[] out = new byte[oLen];
        int ip = 0;
        int op = 0;
        while (ip < iLen)
        {
            int i0 = in[ip++];
            int i1 = in[ip++];
            int i2 = ip < iLen ? in[ip++] : 'A';
            int i3 = ip < iLen ? in[ip++] : 'A';
            if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
                throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
            int b0 = [i0];
            int b1 = [i1];
            int b2 = [i2];
            int b3 = [i3];
            if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
                throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
            int o0 = (b0 << 2) | (b1 >>> 4);
            int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
            int o2 = ((b2 & 3) << 6) | b3;
            out[op++] = (byteo0;
            if (op < oLen)
                out[op++] = (byteo1;
            if (op < oLen)
                out[op++] = (byteo2;
        }
        return out;
    }
    // Dummy constructor.
    private Base64()
    {
    }
// end class Base64Coder
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