com.sun.mail.util

Class QPDecoderStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.sun.mail.util.QPDecoderStream

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

QDecoderStream

public class QPDecoderStream
extends 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.

Author:

John Mani

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	ba
protected int	spaces

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
QPDecoderStream(InputStream in) Create a Quoted Printable decoder that decodes the specified input stream.

Method Summary

Methods

Modifier and Type	Method and Description
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.
long	skip(long n) Skips over and discards n bytes of data from this stream.

Methods inherited from class java.io.FilterInputStream

close, mark, read, reset

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(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 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 FilterInputStream

Returns:

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

Throws:

IOException - if an I/O error occurs.

read

public int read(byte[] buf,
       int off,
       int len)
         throws 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 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:

IOException - if an I/O error occurs.

skip

public long skip(long n)
          throws IOException

Skips over and discards n bytes of data from this stream.

Overrides:

skip in class FilterInputStream

Throws:

IOException

markSupported

public boolean markSupported()

Tests if this input stream supports marks. Currently this class does not support marks

Overrides:

markSupported in class FilterInputStream

available

public int available()
              throws 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 FilterInputStream

Throws:

IOException