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Licence CPOL
First Posted 2 Jun 2004
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Huffman Coding Class

By handychang | 6 Jun 2004
A file compressor class based on the Huffman Tree
4 votes, 17.4%
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2 votes, 8.7%
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8 votes, 34.8%
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9 votes, 39.1%
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4.18/5 - 23 votes
4 removed
μ 3.84, σa 2.59 [?]

Contents

Introduction

This version of file encoder and decoder program is based on the Huffman coding method. It explicitly demonstrates the details of the files during the encoding and decoding. The algorithm is encapsulated in a class En_Decode by the standard C++ language. Here is a demonstration project for the class.

Using the code

This class is implemented by standard C++, so it is very easy to use.

  1. Create an MFC application program as usual.
  2. Add the source file En_Decode.cpp and En_Decode.h to the project.
  3. Add the header file to your project by:
    //
    //    #include "En_Decode.h"
    //
    

    Define your own coder object, such as:

    //
    //    En_Decode Coder;
    //
    
  4. Use the member function of the class to set the source file name and destination encoded file name, then call Encode() to encode the source file.
    //
    //    Coder.SetInputFileName("C:/test.txt", "txt");
    //    Coder.SetOutputFileName("C:/encoded");
    //    Coder.Encode();
    //
    

In the same way, we can decode the encoded files to exactly the source file.

Class Members

Construction

En_Decode Constructs a En_Decode object.

File Name Functions

SetInputFileName Set the input file name.
SetOutputFileName Set the output file name.
GetExtName Get the ext name of the encoded file when decoding.

Paraneter Functions

GetMinFreq Get the minimum frequency of the symbols in the source file.
GetMaxFreq Get the maximum frequency of the symbols in the source file.
GetFreq(idx) Get the frequency value of a symbol in the source file.
GetActiveSymbols Get the number of active symbols in the source file.
GetActualDataLength Get the bytes number of the encoded file not including head.
GetUncodedFileLength Get the length of the source file.
GetEncodedFileCodeLength Get the average code length of the encoded file.
GetSourceFileEntropy Get the entropy of the source file.

Thanks to...

Derek Lakin for his help with CTabCtrlSSL in the demo project.

Contacting the Authors

This is the first time I share my code here. It is done in a hurry, so exception handling is ignored. Any one who is interested in it can enhance it freely, and please let me know about any improvement, thanks!

I am a junior student in Huangzhong University of Science and Technology, China. I am interested in C++ and MFC, and any coding project. I am glad to share my codes here with any one, though it is not that good.

Please contact me via email (zxt0123@163.com).

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

handychang

Web Developer

China China

Member
I am a junior student in Huangzhong University of Science and Technology, China. I am interested in C++ and MFC, and any coding project.
I am glad to share my codes here with any one, though it is not that good. Please contact me via email (zxt0123@163.com).

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Comments and Discussions

 
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Questionfind some error Pinmemberbansal294510:09 4 Dec '08  
GeneralMFC coding Pinmembercuty_bujji2:53 22 Jul '08  
QuestionIs there any other compressing algorithm more efficient than huffman coding Pinmemberwavebai23:05 9 May '07  
QuestionHow to compress many files in folder? PinmemberNewcc19:12 11 Oct '06  
GeneralTab.h Pinmemberbeardy janggut15:45 14 Mar '06  
GeneralRe: Tab.h Pinmembercristitomi3:17 10 Mar '07  
QuestionStreaming Compression? Pinmemberandrew23586:06 14 Jun '04  
AnswerRe: Streaming Compression? PinsussAlan Balkany7:14 14 Jun '04  
GeneralRe: Streaming Compression? Pinmemberhandychang19:19 15 Jun '04  
AnswerRe: Streaming Compression? PinmemberJohn M. Drescher6:39 16 Jun '04  
GeneralRe: Streaming Compression? PinsussAnonymous6:06 23 Jun '05  
GeneralRe: Streaming Compression? PinmemberJohn M. Drescher6:34 23 Jun '05  
AnswerRe: Streaming Compression? PinmemberJan Rodriguez12:44 19 Oct '06  
well, there's adaptive huffman compression, 2 methods: vitter and FGK, i've coded fgk, vitter is a pain in the ass to code, but compresses more
the whole point to it is that adaptive huffman coding can be used for streaming, hope it helps
GeneralSuggestion ! PinmemberNewGhost21:46 11 Jun '04  
GeneralRe: Suggestion ! Pinmemberhandychang21:46 12 Jun '04  
GeneralRe: Suggestion ! Pinmemberleandrobecker10:51 27 Aug '04  
GeneralRe: Suggestion ! Pinmemberjazzwithshaz19:30 13 Jan '05  
QuestionHow does Huffman coding work? PinmemberAORD17:40 7 Jun '04  
AnswerRe: How does Huffman coding work? Pinmemberhandychang21:55 7 Jun '04  
GeneralRe: How does Huffman coding work? Pinsussamirhosein22:15 15 Dec '07  
GeneralPicky!!! PinmemberPaul Charles6:49 3 Jun '04  
GeneralRe: Picky!!! PinmemberJubjub14:30 3 Jun '04  
GeneralRe: Picky!!! PinsussAnonymous19:22 3 Jul '05  
GeneralRe: Picky!!! PinmemberJubjub19:45 3 Jul '05  
GeneralRe: Picky!!! Pinmemberhandychang16:20 3 Jun '04  

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