FIM.Util.Coder.Base64
Class Base64InputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--FIM.Util.Coder.Base64.Base64InputStream

public class Base64InputStream

extends FilterInputStream

An input stream which decodes a base64-encoded stream.

Version:

1.1, 12 Jan 1997

Author:

Glenn Vanderburg, Michael Sonntag (Corrections)

Field Summary

(package private) int[]	buf Buffer for decoded bytes that haven't been read
(package private) int	buffered Number of buffered bytes
(package private) byte[]	ebuf Buffer for encoded bytes
(package private) boolean	textfile if true this is based on a textfile and \r\n will be translated to \n

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Base64InputStream(InputStream in)
Constructs a new Base64InputStream initialized with the specified input stream.

Base64InputStream(InputStream in, boolean textfile)
Constructs a new Base64InputStream initialized with the specified input stream, for a text file.

Method Summary

(package private) static void	()
protected void	fill_buffer() Fills buf with a new chunk of decoded data.
static void	main(String[] args) Test for Base64InputStream.
int	peek() Returns the next byte which will be read.
int	read() Reads a byte of data.
int	read(byte[] b, int off, int len) Reads into an array of bytes.
long	skip(long n) Skips bytes of input.

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Field Detail

buf

int[] buf

Buffer for decoded bytes that haven't been read

buffered

int buffered

Number of buffered bytes

ebuf

byte[] ebuf

Buffer for encoded bytes

textfile

boolean textfile

if true this is based on a textfile and \r\n will be translated to \n

Constructor Detail

Base64InputStream

public Base64InputStream(InputStream in)

Constructs a new Base64InputStream initialized with the specified input stream.

Parameters:

in - the input stream

Base64InputStream

public Base64InputStream(InputStream in,
                         boolean textfile)

Constructs a new Base64InputStream initialized with the specified input stream, for a text file. If the parameter textfile is true, a \r is immediately followed by a \n, the \r will be filtered out.

Parameters:

in - the input stream

textfile - true if the file is a text file

Method Detail

static void ()

read

public int read()
         throws IOException

Reads a byte of data. The method will block if no input is available.

Returns:

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

Throws:

IOException - if an I/O error has occurred.

Overrides:

read in class FilterInputStream

peek

public int peek()
         throws IOException

Returns the next byte which will be read. The method will block if no input is available.

Returns:

the next byte to be read, or -1 if the end of the stream is reached.

Throws:

IOException - If in I/O error has occurred.

read

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

Reads into an array of bytes. Blocks until some input is available. This method should be overridden in a subclass for efficiency (the default implementation reads 1 byte at a time).

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 when the end of the stream is reached

Throws:

IOException - if an I/O error has occurred.

Overrides:

read in class FilterInputStream

skip

public long skip(long n)
          throws IOException

Skips bytes of input.

Parameters:

n - number of bytes to be skipped

Returns:

the actual number of bytes skipped

Throws:

IOException - if an I/O error has occurred.

Overrides:

skip in class FilterInputStream

fill_buffer

protected void fill_buffer()
                    throws IOException

Fills buf with a new chunk of decoded data.

Throws:

IOException - if an I/O error has occurred.

main

public static void main(String[] args)

Test for Base64InputStream.