+1-415-315-9853

info@mywordsolution.com

## Engineering

 Civil Engineering Chemical Engineering Electrical & Electronics Mechanical Engineering Computer Engineering Engineering Mathematics MATLAB Other Engineering Digital Electronics Biochemical & Biotechnology

Huffman Coding based Compression Library
Background

Huffman code is used to compress data file, where the data is represented as a sequence of characters. Huffman's greedy algorithm uses a table giving how often each character occurs; it then uses this table to build up an optimal way of representing each character as a binary string. We call the binary string the codeword for that character. A property of Huffman code is that it is a prefix code, i.e., in Huffman coding, no codeword is a prefix of some other codeword. The advantage of prefix code is that it makes decoding easier, as we do not need to use delimiter between two successive codewords. Given the frequency of each of the character, we can devise a greedy algorithm for finding the optimal Huffman codeword of each of the characters. For details of the greedy algorithm, INTRODUCTION TO ALGORITHMS 3rd edition by CORMEN please read Section 16.3 of the textbook.

In this assignment, we will build a compression library that compress text files using Huffman coding scheme. This library will have two programs: compress, and decompress; compress accepts a text file and produces a compressed representation of that text file; decompress accepts a file that was compressed with the compress program, and recovers the original file.

Implementation

Input to the compress is a text le with arbitrary size, but for this assignment we will sippose that data structure of the file fits in the main memory of a computer. Output of the program is a compressed representation of the original file. You will have to save the codetable in the header of the compressed file, so that you could use the codetable for decompressing the compressed file. Input to the decompress is a compressed file, from that the program recovers the original file. For sanity check, you must have a specific magic word at some position in the header of the compressed file, so that decompress can recognize whether the given file is a valid Huffman compressed file.

You must pay attention to the following issues:

The file that we would use for testing can be very large, having size in Gigabytes, so make sure that your program is bug-free and it works for large input file.

prepare efficient algorithm, we will take off as much as 20 points if we feel that the program is taking unusually long time.

You must make sure that your program runs on a Linux Machine, and identically follows the formatting instructions. For formatting error, as much as 15 points can be taken off .

You should provide a Make file to compile your programs. Also, a README.txt file must be provided that will have the instruction to compile and run the programs.

Command-Line options

Compression:

C++:  ./compress  -f  myfile.txt  [-o  myfile.hzip  -s

Java:  sh  compress.sh  -f  myfile.txt  [-o  myfile.hzip  -s]

Decompression:

C++:  ./decompress  -f  myfile.hzip[-r  -v]

Java:  sh  decompress.sh  -f  myfile.hzip  [-o  myfile.txt  -s]

The command-line options that are within the square bracket are optional. The option \-f" precedes the input le name, which always has a .txt extension. The \-s" option prints statistics, such as for compression it prints, how many distinct characters are there, what is the compression ratio, and the wall clock time that it took for performing the compression task. For decompression, it prints how many character were written, and the wall clock time it took for performing the decompression task. The \-o" option precedes the name of an output le. If the output file name is not given, then we will append .hzip at the end of the input filename to create the output filename.

Computer Engineering, Engineering

• Category:- Computer Engineering
• Reference No.:- M91171

Have any Question?

## Related Questions in Computer Engineering

### Consider the uc davis policy on reading electronic mail a

Consider the UC Davis policy on reading electronic mail. A research group wants to obtain raw data from a network that carries all network traffic to the Department of Political Science. a. Discuss the impact of the elec ...

### Write an apa formatted paper to address the assignment

Write an APA formatted paper to address the assignment below. This paper should be approximately 4-5 pages long, not including cover, abstract, references, etc. Be sure the paper thoroughly answers the topics to be addre ...

### Show that there is no speckle in images obtained by an

Show that there is no speckle in images obtained by an ideal imaging system. Show that, for a practical imaging system, the speckle size measured by its correlation distance can be used to estimate the resolution (that i ...

### 1 in the sandpile model the sand grains are distributed one

1. In the Sandpile model, the sand grains are distributed, one to each neighbor. Modify the model so that grains are distributed to neighbors randomly. How does this change the model behavior? 2. The Sandpile model exhib ...

### 1 from the knowledge you have acquired in this chapter

1. From the knowledge you have acquired in this chapter about virtualization, discuss the future of virtualization as a business model. 2. Compare and contrast the security concerns in a virtual network infrastructure an ...

### 1 in the game of life can you construct a glider gun of

1. In the Game of Life, can you construct a glider gun of glider emission period 15? Period 20? Save your configurations as buttons in the Life model in the NetLogo models library. 2. A methuselah is a small pattern that ...

### 1 the discussion of acyclic creates imposes constraints on

1. The discussion of acyclic creates imposes constraints on the types of created subjects but not on the types of created objects. Why not? 2. Prove that if a graph for cc is constructed and has no loops, the system is a ...

### You are a forensics investigator and need to address the

You are a forensics investigator and need to address the following cases. You can find the Case Projects at the end of Chapters 3 and 4 in your textbook. Case Project 3-3: Digital Evidence Storage Formats (CLO 1) Case Pr ...

### 1 write a program that allows the user to specify a circle

1. Write a program that allows the user to specify a circle by typing the radius in a JOptionPane and then clicking on the center. Note that you don't need a "Draw" button. 2. Write a program that allows the user to spec ...

### Q1 what are the three techniques to improve performance of

Q.1 What are the three techniques to improve performance of CPU? Q.2 Describe how a cache memory is organized? Q.3 What are the three different approaches are commonly used to enhance the performance of memory? Q.4 Narra ...

• 13,132 Experts

## Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

### Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

### Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

### Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

### Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

### Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen