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  package com.pubnub.api;

Simple base64 encoder, can be implemented in other platforms.
  
  class Base64Encoder {
  
      // 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;
    }

    
This class is not instantiable.
    private Base64Encoder() {
    }
// end class Base64Encoder
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