assignment4
Class SimpleHuffProcessor

java.lang.Object
  assignment4.SimpleHuffProcessor

All Implemented Interfaces:

IHuffConstants, IHuffProcessor

public class SimpleHuffProcessor
extends java.lang.Object
implements IHuffProcessor

Field Summary

Fields inherited from interface assignment4.IHuffConstants

ALPH_SIZE, BITS_PER_INT, BITS_PER_WORD, MAGIC_NUMBER, PSEUDO_EOF, STORE_COUNTS, STORE_CUSTOM, STORE_TREE

Constructor Summary

SimpleHuffProcessor()

Method Summary

int	compress(java.io.InputStream in, java.io.OutputStream out, boolean force) Compresses input to output, where the same InputStream has previously been pre-processed via preprocessCompress storing state used by this call.
int	preprocessCompress(java.io.InputStream in) Preprocess data so that compression is possible --- count characters/create tree/store state so that a subsequent call to compress will work.
void	setViewer(HuffViewer viewer) Make sure this model communicates with some view.
int	uncompress(java.io.InputStream in, java.io.OutputStream out) Uncompress a previously compressed stream in, writing the uncompressed bits/data to out.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleHuffProcessor

public SimpleHuffProcessor()

Method Detail

compress

public int compress(java.io.InputStream in,
                    java.io.OutputStream out,
                    boolean force)
             throws java.io.IOException

Description copied from interface: IHuffProcessor

Compresses input to output, where the same InputStream has previously been pre-processed via preprocessCompress storing state used by this call.

Specified by:

compress in interface IHuffProcessor

Parameters:

in - is the stream being compressed (not a BitInputStream)

out - is bound to a file/stream to which bits are written for the compressed file (not a BitOutputStream)

Returns:

the number of bits written

Throws:

java.io.IOException

preprocessCompress

public int preprocessCompress(java.io.InputStream in)
                       throws java.io.IOException

Description copied from interface: IHuffProcessor

Preprocess data so that compression is possible --- count characters/create tree/store state so that a subsequent call to compress will work. The InputStream is not a BitInputStream, so wrap it into one as needed.

Specified by:

preprocessCompress in interface IHuffProcessor

Parameters:

in - is the stream which could be subsequently compressed

Returns:

number of bits saved by compression

Throws:

java.io.IOException

uncompress

public int uncompress(java.io.InputStream in,
                      java.io.OutputStream out)
               throws java.io.IOException

Description copied from interface: IHuffProcessor

Uncompress a previously compressed stream in, writing the uncompressed bits/data to out.

Specified by:

uncompress in interface IHuffProcessor

Parameters:

in - is the previously compressed data (not a BitInputStream)

out - is the uncompressed file/stream

Returns:

the number of bits written to the uncompressed file/stream

Throws:

java.io.IOException

setViewer

public void setViewer(HuffViewer viewer)

Description copied from interface: IHuffProcessor

Make sure this model communicates with some view.

Specified by:

setViewer in interface IHuffProcessor

Parameters:

viewer - is the view for communicating.