info.aduna.gee.publication.util
Class Base64InputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          info.aduna.gee.publication.util.AbstractByteFilterInputStream
              info.aduna.gee.publication.util.Base64InputStream

All Implemented Interfaces:

Closeable

public class Base64InputStream
extends AbstractByteFilterInputStream

Provides decoding of BASE64 encoded data as an input stream filter. The underlying input stream is expected to be encoded in BASE64 form.

Author:

Joshua Davis

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Base64InputStream(InputStream in)
Creates a new Base64 decoding input stream, using the input stream (encoded stream).

Method Summary

static int	parseCharacter(int ch) Checks a character for correct BASE64 encoding.
int	read() Reads the next byte of data from this input stream.

Methods inherited from class info.aduna.gee.publication.util.AbstractByteFilterInputStream

read, readByte

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

Base64InputStream

public Base64InputStream(InputStream in)

Creates a new Base64 decoding input stream, using the input stream (encoded stream).

Parameters:

in - The base 64 encoded input stream

Method Detail

read

public int read()
         throws IOException

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

Specified by:

read in class AbstractByteFilterInputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached.

Throws:

IOException - if an I/O error occurs.

See Also:

FilterInputStream.in

parseCharacter

public static final int parseCharacter(int ch)

Checks a character for correct BASE64 encoding. Returns -1 if the character is not valid. Returns END_OF_INPUT if 'ch' is the end of input character.

Returns:

int The binary value of the input character, or -1 if it is not a valid BASE64 character.