com.sun.xml.messaging.saaj.packaging.mime.util
Class QPDecoderStream

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.FilterInputStream
          extended by com.sun.xml.messaging.saaj.packaging.mime.util.QPDecoderStream
All Implemented Interfaces:
java.io.Closeable
Direct Known Subclasses:
QDecoderStream

public class QPDecoderStream
extends java.io.FilterInputStream

This class implements a QP Decoder. It is implemented as a FilterInputStream, so one can just wrap this class around any input stream and read bytes from this filter. The decoding is done as the bytes are read out.


Field Summary
protected  byte[] ba
           
protected  int spaces
           
 
Fields inherited from class java.io.FilterInputStream
in
 
Constructor Summary
QPDecoderStream(java.io.InputStream in)
          Create a Quoted Printable decoder that decodes the specified input stream.
 
Method Summary
 int available()
          Returns the number of bytes that can be read from this input stream without blocking.
 boolean markSupported()
          Tests if this input stream supports marks.
 int read()
          Read the next decoded byte from this input stream.
 int read(byte[] buf, int off, int len)
          Reads up to len decoded bytes of data from this input stream into an array of bytes.
 
Methods inherited from class java.io.FilterInputStream
close, mark, read, reset, skip
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

ba

protected byte[] ba

spaces

protected int spaces
Constructor Detail

QPDecoderStream

public QPDecoderStream(java.io.InputStream in)
Create a Quoted Printable decoder that decodes the specified input stream.

Parameters:
in - the input stream
Method Detail

read

public int read()
         throws java.io.IOException
Read the next decoded byte from this input stream. The 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.

Overrides:
read in class java.io.FilterInputStream
Returns:
the next byte of data, or -1 if the end of the stream is reached.
Throws:
java.io.IOException - if an I/O error occurs.

read

public int read(byte[] buf,
                int off,
                int len)
         throws java.io.IOException
Reads up to len decoded bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

Overrides:
read in class java.io.FilterInputStream
Parameters:
buf - the buffer into which the data is read.
off - the start offset of the data.
len - the maximum number of bytes read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
java.io.IOException - if an I/O error occurs.

markSupported

public boolean markSupported()
Tests if this input stream supports marks. Currently this class does not support marks

Overrides:
markSupported in class java.io.FilterInputStream

available

public int available()
              throws java.io.IOException
Returns the number of bytes that can be read from this input stream without blocking. The QP algorithm does not permit a priori knowledge of the number of bytes after decoding, so this method just invokes the available method of the original input stream.

Overrides:
available in class java.io.FilterInputStream
Throws:
java.io.IOException