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file compression

Submitted on: 1/1/2015 5:15:00 PM
By: vsim (from psc cd)  
Level: Intermediate
User Rating: By 3 Users
Compatibility: C
Views: 1759
     File compression is useful when transmitting very large files.Ascii text files encode each chracter by an 8 bit fixed lenght code.Such files can often be significantly compressed if instead of this fixed lenght code one uses a variable lenght code where the more frequently occuring characters have short codes and the less frequently occuring characters have longer codes.For example ,a large data file might have mostly digit,space and new-line characters in it.If short(less than 8 bit) codes are used for these then the file would be significantly compressed.A Lisp file might have many left and right parentheses in it.Using short codes for these would compress the file.I used Huffman codes to compress the file .I worked real hard on it and it is long program Please declare me the winner of this new year.

INCLUDE files:

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//INCLUDE files for :file compression
#ifndef _minheap_h
#define _minheap_h
#include "hufftree.h"
#define MAX_ARRAY 128
typedef struct MinHeapInfo *MinHeap;
struct MinHeapInfo
int ArraySize, Size;
HuffTree *heap_array;
MinHeap NewMinHeap(void);
HuffTree DeleteMinHeap(MinHeap);
void InsertMinHeap(MinHeap, HuffTree);
int SizeMinHeap(MinHeap);
#ifndef _hufftree_h
#define _hufftree_h
#define MAX_ARRAY128
typedef struct HuffNode *HuffTree;
struct HuffNode
char character;
int frequency;
HuffTree left, right;
HuffTree NewHuffTree(char, int);
HuffTree JoinHuffTrees(HuffTree, HuffTree);
void OutputHuffCodes(HuffTree);
 #ifndef _error_h
#define _error_h
void FatalError(char msg[ ]);
void Error(char msg[ ]);
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