com.ibm.commons.util.io.base64
Class Base64InputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          com.ibm.commons.util.io.base64.Base64InputStream

All Implemented Interfaces:

java.io.Closeable

Direct Known Subclasses:

Base64.InputStream

public class Base64InputStream
extends java.io.FilterInputStream

A Base64 content transfer encoding filter stream.

From RFC 2045, section 6.8:

The Base64 Content-Transfer-Encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. The encoding and decoding algorithms are simple, but the encoded data are consistently only about 33 percent larger than the unencoded data.

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Base64InputStream(java.io.InputStream in)
Constructs an input stream that decodes an underlying Base64-encoded stream.

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.
int	read() Reads the next byte of data from the input stream.
int	read(byte[] b, int off, int len) Reads up to len bytes of data from the input stream into an array of bytes.

Methods inherited from class java.io.FilterInputStream

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(java.io.InputStream in)

Constructs an input stream that decodes an underlying Base64-encoded stream.

Parameters:

in - the Base64-encoded stream

Method Detail

read

public int read()
         throws java.io.IOException

Reads the next byte of data from the input stream.

Overrides:

read in class java.io.FilterInputStream

Returns:

next byte in data stream

Throws:

java.io.IOException - IO Exception occurred

read

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

Reads up to len bytes of data from the input stream into an array of bytes.

Overrides:

read in class java.io.FilterInputStream

Parameters:

b - buffer to put data

off - offset to start of buffer

len - number of bytes from buffer

Returns:

number of bytes read

Throws:

java.io.IOException - IO Exception occurred

available

public int available()
              throws java.io.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.

Overrides:

available in class java.io.FilterInputStream

Returns:

number of bytes that can be read

Throws:

java.io.IOException - IO Exception occurred