Package net.i2p.util

Class LookaheadInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

net.i2p.util.LookaheadInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class LookaheadInputStream
extends FilterInputStream

Simple lookahead buffer to keep the last K bytes in reserve, configured to easily be reused. Currently only used by the ResettableGZIPInputStream.

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
LookaheadInputStream(int lookaheadSize)	Configure a stream that hides a number of bytes from the reader.

Method Summary

Modifier and Type	Method	Description
boolean	getEOFReached()
byte[]	getFooter()	Grab the lookahead footer.
void	initialize(InputStream src)	Start the LookaheadInputStream with the given input stream.
int	read()
int	read(byte[] buf, int off, int len)
long	skip(long n)

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, reset

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Constructor Details

LookaheadInputStream

public LookaheadInputStream(int lookaheadSize)

Configure a stream that hides a number of bytes from the reader. The last n bytes will never be available from read(), they can only be obtained from getFooter(). initialize() MUST be called before doing any read() calls.

Parameters:

lookaheadSize - how many bytes to hide

Method Details

getEOFReached

public boolean getEOFReached()

initialize

public void initialize(InputStream src)
                throws IOException

Start the LookaheadInputStream with the given input stream. Resets everything if the LookaheadInputStream was previously used. WARNING - blocking until lookaheadSize bytes are read!

Throws:

IOException - if less than lookaheadSize bytes could be read.

read

public int read()
         throws IOException

Overrides:

read in class FilterInputStream

Throws:

IOException

read

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

Overrides:

read in class FilterInputStream

Throws:

IOException

getFooter

public byte[] getFooter()

Grab the lookahead footer. This will be of size lookaheadsize given in constructor. The last byte received will be in the last byte of the array.

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class FilterInputStream

Throws:

IOException

Since:

0.9.33