TEXT COMPRESSION USING HUFFMAN CODES. - Beginners / Lab Assignments Source Code in C++

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Home » C++ Home » Beginners / Lab Assignments Home » TEXT COMPRESSION USING HUFFMAN CODES.

A D V E R T I S E M E N T

Title	TEXT COMPRESSION USING HUFFMAN CODES.
Author	rajarathnam.l
Author Email	rajara2004 [at] yahoo.co.in
Description	The project provides the way of compressing the repeated text size by using concept of huffman encoding technique.
Category	C++ » Beginners / Lab Assignments
Hits	386414
Code	Select and Copy the Code
/* TEXT COMPRESSION - HUFFMAN CODING / #include<stdio.h> #include<string.h> #include<conio.h> #define MAXSUM 50 #define MAXNODES 100 #define MAXLEN 15 enum direction{left,right}; enum boolean{false,true}; typedef class nodenodeptr; typedef short int symbolindex; typedef short int listptr; nodeptr root; class symbol { public: char c; int count; nodeptr ptr; operator int() { return(count); } }; class node { public: int weight; nodeptr lc,rc; nodeptr parent; direction dir; boolean isleaf; symbolindex index; node() { lc=NULL; rc=NULL; parent=NULL; weight=0; isleaf=false; index=0; } node(symbolindex i,symbol &s) { index=i; weight=s.count; lc=NULL; rc=NULL; parent=NULL; isleaf=true; s.ptr=this; } int getindex() { if(isleaf) return(index); else return(0); } void insertright(nodeptr n) { n->parent=this; n->dir=right; rc=n; isleaf=false; } void insertleft(nodeptr n) { n->parent=this; n->dir=left; lc=n; isleaf=false; } }; class nodelist { private: listptr start,avail,prev; int cnt; nodeptr info[MAXNODES]; listptr link[MAXNODES]; public: nodelist(); void add(nodeptr n); nodeptr least(); boolean isempty() { return(cnt==0)?true:false; } }; nodelist::nodelist() { int i; start=1; link[start]=0; info[start]=NULL; avail=2; cnt=0; for(i=2;i<MAXNODES;i++) { link[i]=i+1; } } void nodelist::add(nodeptr n) { listptr ptr=link[start]; prev=start; listptr temp=avail; avail=link[avail]; info[temp]=n; while((ptr!=0 && (info[ptr]->weight<info[temp]->weight))) { prev=ptr; ptr=link[ptr]; } link[prev]=temp; link[temp]=ptr; cnt++; } nodeptr nodelist::least() { listptr temp=link[start]; cnt--; if(temp==0) return(NULL); link[start]=link[temp]; link[temp]=avail; avail=temp; return(info[temp]); } class symtab { private: symbol sym[MAXSUM]; public: int count; symtab() { count=0; } int find(char s); symbol & operator[](int index) { return(sym[index]); } void add(char c,int n); chargetcode(int index); }; int symtab::find(char s) { int i; for(i=0;i<count;i++) if(sym[i].c==s) return i; return(-1); } void symtab::add(char c,int n) { symbol s; s.count=n; s.c=c; sym[count++]=s; } char symtab::getcode(int index) { int pos=MAXLEN; static char buffer[MAXLEN+1]; buffer[pos]='

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