| java.lang.Object
 com.sun.midp.jadtool.Base64
| Base64 | | public class Base64 (Code) | | A class to do base64 encoding and decoding.
Base64 is a system for representing raw byte data as Ascii
characters. Each 3 input bytes will translate into 4
base64 digits. Each base64 digit is represented by an Ascii
character. This table shows how bytes are converted to
base64 digits.
base64 | | | | |
digits |6 5 4 3 2 1|6 5 4 3 2 1|6 5 4 3 2 1|6 5 4 3 2 1|
-------------------------------------------------
input |8 7 6 5 4 3 2 1|8 7 6 5 4 3 2 1|8 7 6 5 4 3 2 1|
bytes | | | |
Base64 encoding always extends the input data to a multiple
of 24 bits by padding with zeros.
Base64 is fully described in RFC 1521.
ftp://ds.internic.net/rfc/rfc1521.txt
Published in "Java Cryptography", 1998 by
O'Reilly & Associates.
|
| Method Summary | |
| public static byte[] | decode(String base64)
decode
convert a base64 string into an array of bytes.
Parameters:
base64 - A String of base64 digits to decode. | | public static String | encode(byte[] raw)
encode
coverts a byte array to a string populated with
base64 digits. | | protected static char[] | encodeBlock(byte[] raw, int offset)
| | protected static char | getChar(int sixBit)
| | protected static int | getValue(char c)
|
| decode | | public static byte[] decode(String base64)(Code) | | decode
convert a base64 string into an array of bytes.
Parameters:
base64 - A String of base64 digits to decode. A byte array containing the decoded value ofthe base64 input string |
| encode | | public static String encode(byte[] raw)(Code) | | encode
coverts a byte array to a string populated with
base64 digits. It steps through the byte array
calling a helper method for each block of three
input bytes
Parameters:
raw - The byte array to encode A string in base64 encoding |
| encodeBlock | | protected static char[] encodeBlock(byte[] raw, int offset)(Code) | | |
| getChar | | protected static char getChar(int sixBit)(Code) | | |
| getValue | | protected static int getValue(char c)(Code) | | |
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