com.tangosol.io
Class Base64InputStream

java.lang.Object
  java.io.InputStream
      com.tangosol.io.Base64InputStream

All Implemented Interfaces:

InputStreaming, Closeable

public class Base64InputStream
extends InputStream
implements InputStreaming

Reads binary data from a Reader using IETF RFC 2045 Base64 Content Transfer Encoding. Static helpers are available for decoding directly from a char array to a byte array.

Author:

cp 2000.09.07

Field Summary

protected static byte[]	EMPTY Empty binary data.
protected int[]	m_abGroup Group of bytes (stored as ints 0..255).
protected boolean	m_fClosed True after close is invoked.
protected boolean	m_fEOF True after eof is determined.
protected int	m_ofbGroup The offset in the group of bytes.
protected Reader	m_reader The Reader object from which the Base64 encoded data is read.

Constructor Summary

Base64InputStream(Reader reader)
Construct a Base64InputStream on a Reader object.

Method Summary

int	available() Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.
void	close() Close the stream, flushing any accumulated bytes.
static int	decode(char ch) Decode one base64 alphabet character.
static byte[]	decode(char[] ach) Decode the passed character data that was encoded using Base64 encoding.
static byte[]	decode(char[] ach, boolean fJunk) Decode the passed character data that was encoded using Base64 encoding.
static byte[]	decode(char[] ach, int of, int cch) Decode the passed character data that was encoded using Base64 encoding.
static byte[]	decode(char[] ach, int of, int cch, boolean fJunk) Decode the passed character data that was encoded using Base64 encoding.
int	read() Reads the next byte of data from the input stream.

Methods inherited from class java.io.InputStream

mark, markSupported, read, read, reset, skip

Methods inherited from interface com.tangosol.io.InputStreaming

mark, markSupported, read, read, reset, skip

Field Detail

EMPTY

protected static final byte[] EMPTY

Empty binary data.

m_fClosed

protected boolean m_fClosed

True after close is invoked.

m_fEOF

protected boolean m_fEOF

True after eof is determined.

m_reader

protected Reader m_reader

The Reader object from which the Base64 encoded data is read.

m_abGroup

protected int[] m_abGroup

Group of bytes (stored as ints 0..255).

m_ofbGroup

protected int m_ofbGroup

The offset in the group of bytes.

Constructor Detail

Base64InputStream

public Base64InputStream(Reader reader)

Construct a Base64InputStream on a Reader object.

Parameters:

reader - the Reader to read the Base64 encoded data from

Method Detail

read

public int read()
         throws IOException

Reads the next byte of data from the 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.

Specified by:

read in interface InputStreaming

Specified by:

read in class InputStream

Returns:

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

Throws:

IOException - if an I/O error occurs.

available

public int available()
              throws IOException

Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or or another thread.

Specified by:

available in interface InputStreaming

Overrides:

available in class InputStream

Returns:

the number of bytes that can be read from this input stream without blocking.

Throws:

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Close the stream, flushing any accumulated bytes. The underlying reader is not closed.

Specified by:

close in interface InputStreaming

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException - if an I/O error occurs.

decode

public static byte[] decode(char[] ach)

Decode the passed character data that was encoded using Base64 encoding.

Parameters:

ach - the array containing the characters to decode

Returns:

the decoded binary data as a byte array

decode

public static byte[] decode(char[] ach,
                            boolean fJunk)

Decode the passed character data that was encoded using Base64 encoding.

Parameters:

ach - the array containing the characters to decode

fJunk - true if the char array may contain whitespace or linefeeds

Returns:

the decoded binary data as a byte array

decode

public static byte[] decode(char[] ach,
                            int of,
                            int cch)

Decode the passed character data that was encoded using Base64 encoding.

Parameters:

ach - the array containing the characters to decode

of - the start offset in the char array

cch - the number of characters to decode

Returns:

the decoded binary data as a byte array

decode

public static byte[] decode(char[] ach,
                            int of,
                            int cch,
                            boolean fJunk)

Decode the passed character data that was encoded using Base64 encoding.

Parameters:

ach - the array containing the characters to decode

of - the start offset in the char array

cch - the number of characters to decode

fJunk - true if the char array may contain whitespace or linefeeds

Returns:

the decoded binary data as a byte array

decode

public static int decode(char ch)

Decode one base64 alphabet character.

Parameters:

ch - the character

Returns:

the ordinal value of the character