Package fr.opensagres.xdocreport.core.utils

Class Base64Utility

java.lang.Object

fr.opensagres.xdocreport.core.utils.Base64Utility

public final class Base64Utility
extends Object

This class converts to/from base64. The alternative conversions include: encode: byte[] into String byte[] into char[] byte[] into OutStream byte[] into Writer decode: char[] into byte[] String into byte[] char[] into OutStream String into OutStream

Method Summary

Modifier and Type	Method	Description
static void	decode(char[] id, int o, int l, OutputStream ostream)
static byte[]	decode(String id)
static void	decode(String id, OutputStream ostream)
static byte[]	decodeChunk(char[] id, int o, int l)	The decode_chunk routine decodes a chunk of data into its native encoding. base64 encodes each 3 octets of data into 4 characters from a limited 64 character set.
static String	encode(byte[] id)
static void	encode(byte[] id, int o, int l, Writer writer)
static String	encode(InputStream in)
static char[]	encodeChunk(byte[] id, int o, int l)
static void	encodeChunk(byte[] id, int o, int l, OutputStream ostream)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

decodeChunk

public static byte[] decodeChunk(char[] id,
 int o,
 int l)
                          throws Base64Exception

The decode_chunk routine decodes a chunk of data into its native encoding. base64 encodes each 3 octets of data into 4 characters from a limited 64 character set. The 3 octets are joined to form 24 bits which are then split into 4 x 6bit values. Each 6 bit value is then used as an index into the 64 character table of base64 chars. If the total data length is not a 3 octet multiple the '=' char is used as padding for the final 4 char group, either 1 octet + '==' or 2 octets + '='.

Parameters:

id - The input data to be processed

o - The offset from which to begin processing

l - The length (bound) at which processing is to end

Returns:

The decoded data

Throws:

Base64Exception - Thrown is processing fails due to formatting exceptions in the encoded data

decode

public static byte[] decode(String id)
                     throws Base64Exception

Throws:

Base64Exception

decode

public static void decode(char[] id,
 int o,
 int l,
 OutputStream ostream)
                   throws Base64Exception

Throws:

Base64Exception

decode

public static void decode(String id,
 OutputStream ostream)
                   throws Base64Exception

Throws:

Base64Exception

encode

public static String encode(InputStream in)
                     throws IOException

Throws:

IOException

encode

public static String encode(byte[] id)

encodeChunk

public static char[] encodeChunk(byte[] id,
 int o,
 int l)

encodeChunk

public static void encodeChunk(byte[] id,
 int o,
 int l,
 OutputStream ostream)
                        throws Base64Exception

Throws:

Base64Exception

encode

public static void encode(byte[] id,
 int o,
 int l,
 Writer writer)
                   throws Base64Exception

Throws:

Base64Exception