de.nava.informa.utils
Class Base64Decoder

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          de.nava.informa.utils.Base64Decoder

All Implemented Interfaces:

Closeable

 class Base64Decoder
extends FilterInputStream

A class to decode Base64 streams and strings. See RFC 1521 section 5.2 for details of the Base64 algorithm. This class can be used for decoding strings: String encoded = "d2VibWFzdGVyOnRyeTJndWVTUw"; String decoded = Base64Decoder.decode(encoded); or for decoding streams: InputStream in = new Base64Decoder(System.in);

Version:

1.0, 2000/06/11

Author:

Jason Hunter, Copyright 2000

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Base64Decoder(InputStream in)
Constructs a new Base64 decoder that reads input from the given InputStream.

Method Summary

static String	decode(String encoded) Returns the decoded form of the given encoded string.
int	read() Returns the next decoded character from the stream, or -1 if end of stream was reached.
int	read(byte[] b, int off, int len) Reads decoded data into an array of bytes and returns the actual number of bytes read, or -1 if end of stream was reached.

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

Base64Decoder

public Base64Decoder(InputStream in)

Constructs a new Base64 decoder that reads input from the given InputStream.

Parameters:

in - the input stream

Method Detail

read

public int read()
         throws IOException

Returns the next decoded character from the stream, or -1 if end of stream was reached.

Overrides:

read in class FilterInputStream

Returns:

the decoded character, or -1 if the end of the input stream is reached

Throws:

IOException - if an I/O error occurs

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

Reads decoded data into an array of bytes and returns the actual number of bytes read, or -1 if end of stream was reached.

Overrides:

read in class FilterInputStream

Parameters:

b - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes to read

Returns:

the actual number of bytes read, or -1 if the end of the input stream is reached

Throws:

IOException - if an I/O error occurs

decode

public static String decode(String encoded)

Returns the decoded form of the given encoded string.

Parameters:

encoded - the string to decode

Returns:

the decoded form of the encoded string