太专业了，哈弗曼编码比较繁琐，一般人不会去学的，哥们肯定是学习通信的，学习在郑州？？
度娘这么说的，
程序代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 100
#define M 2*N-1
typedef char * HuffmanCode[2*M];//haffman编码
typedef struct
{
int weight;//权值
int parent;//父节节点
int LChild;//左子节点
int RChild;//右子节点
}HTNode,Huffman[M+1];//huffman树
typedef struct Node
{
int weight; //叶子结点的权值
char c; //叶子结点
int num; //叶子结点的二进制码的长度
}WNode,WeightNode[N];
/***产生叶子结点的字符和权值***/
void CreateWeight(char ch[],int *s,WeightNode CW,int *p)
{
int i,j,k;
int tag;
*p=0;//叶子节点个数
//统计字符出现个数,放入CW
for(i=0;ch[i]!='\0';i++)
{
tag=1;
for(j=0;j<i;j++)
if(ch[j]==ch[i])
{
tag=0;
break;
}
if(tag)
{
CW[++*p].c=ch[i];
CW[*p].weight=1;
for(k=i+1;ch[k]!='\0';k++)
if(ch[i]==ch[k])
CW[*p].weight++;//权值累加
}
}
*s=i;//字符串长度
}
/********创建HuffmanTree********/
void CreateHuffmanTree(Huffman ht,WeightNode w,int n)
{
int i,j;
int s1,s2;
//初始化哈夫曼树
for(i=1;i<=n;i++)
{
ht[i].weight =w[i].weight;
ht[i].parent=0;
ht[i].LChild=0;
ht[i].RChild=0;
}
for(i=n+1;i<=2*n-1;i++)
{
ht[i].weight=0;
ht[i].parent=0;
ht[i].LChild=0;
ht[i].RChild=0;
}
for(i=n+1;i<=2*n-1;i++)
{
for(j=1;j<=i-1;j++)
if(!ht[j].parent)
break;
s1=j; //找到第一个双亲不为零的结点
for(;j<=i-1;j++)
if(!ht[j].parent)
s1=ht[s1].weight>ht[j].weight?j:s1;
ht[s1].parent=i;
ht[i].LChild=s1;
for(j=1;j<=i-1;j++)
if(!ht[j].parent)
break;
s2=j; //找到第二个双亲不为零的结点
for(;j<=i-1;j++)
if(!ht[j].parent)
s2=ht[s2].weight>ht[j].weight?j:s2;
ht[s2].parent=i;
ht[i].RChild=s2;
ht[i].weight=ht[s1].weight+ht[s2].weight;//权值累加
}
}
/***********叶子结点的编码***********/
void CrtHuffmanNodeCode(Huffman ht,char ch[],HuffmanCode h,WeightNode weight,int m,int n)
{
int i,c,p,start;
char *cd;
cd=(char *)malloc(n*sizeof(char));
cd[n-1]='\0';//末尾置0
for(i=1;i<=n;i++)
{
start=n-1; //cd串每次从末尾开始
c=i;
p=ht[i].parent;//p在n+1至2n-1
while(p) //沿父亲方向遍历,直到为0
{
start--;//依次向前置值
if(ht[p].LChild==c)//与左子相同,置0
cd[start]='0';
else //否则置1
cd[start]='1';
c=p;
p=ht[p].parent;
}
weight[i].num=n-start; //二进制码的长度(包含末尾0)
h[i]=(char *)malloc((n-start)*sizeof(char));
strcpy(h[i],&cd[start]);//将二进制字符串拷贝到指针数组h中
}
free(cd);//释放cd内存
system("pause");
}
/*********所有字符的编码*********/
void CrtHuffmanCode(char ch[],HuffmanCode h,HuffmanCode hc,WeightNode weight,int n,int m)
{
int i,k;
for(i=0;i<m;i++)
{
for(k=1;k<=n;k++) /*从weight[k].c中查找与ch[i]相等的下标K*/
if(ch[i]==weight[k].c)
break;
hc[i]=(char *)malloc((weight[k].num)*sizeof(char));
strcpy(hc[i],h[k]); //拷贝二进制编码
}
}
/*****解码*****/
void TrsHuffmanTree(Huffman ht,WeightNode w,HuffmanCode hc,int n,int m)
{
int i=0,j,p;
printf("***StringInformation***\n");
while(i<m)
{
p=2*n-1;//从父亲节点向下遍历直到叶子节点
for(j=0;hc[i][j]!='\0';j++)
{
if(hc[i][j]=='0')
p=ht[p].LChild;
else
p=ht[p].RChild;
}
printf("%c",w[p].c); /*打印原信息*/
i++;
}
}
/*****释放huffman编码内存*****/
void FreeHuffmanCode(HuffmanCode h,HuffmanCode hc,int n,int m)
{
int i;
for(i=1;i<=n;i++)//释放叶子结点的编码
free(h[i]);
for(i=0;i<m;i++) //释放所有结点的编码
free(hc[i]);
}
void main()
{
int i,n=0; /*n为叶子结点的个数*/
int m=0; /*m为字符串ch[]的长度*/
char ch[N]; /*ch[N]存放输入的字符串*/
Huffman ht; /*Huffman二叉数 */
HuffmanCode h,hc; /*h存放叶子结点的编码，hc 存放所有结点的编码*/
WeightNode weight; /*存放叶子结点的信息*/
printf("\t***HuffmanCoding***\n");
printf("please input information :");
gets(ch); /*输入字符串*/
CreateWeight(ch,&m,weight,&n); /*产生叶子结点信息，m为字符串ch[]的长度*/
printf("***WeightInformation***\n Node ");
for(i=1;i<=n;i++) /*输出叶子结点的字符与权值*/
printf("%c ",weight[i].c);
printf("\nWeight ");
for(i=1;i<=n;i++)
printf("%d ",weight[i].weight);
CreateHuffmanTree(ht,weight,n); /*产生Huffman树*/
printf("\n***HuffamnTreeInformation***\n");
printf("\ti\tweight\tparent\tLChild\tRChild\n");
for(i=1;i<=2*n-1;i++) /*打印Huffman树的信息*/
printf("\t%d\t%d\t%d\t%d\t%d\n",i,ht[i].weight,ht[i].parent,ht[i].LChild,ht[i].RChild);
CrtHuffmanNodeCode(ht,ch,h,weight,m,n); /*叶子结点的编码*/
printf(" ***NodeCode***\n"); /*打印叶子结点的编码*/
for(i=1;i<=n;i++)
{
printf("\t%c:",weight[i].c);
printf("%s\n",h[i]);
}
CrtHuffmanCode(ch,h,hc,weight,n,m); /*所有字符的编码*/
printf("***StringCode***\n"); /*打印字符串的编码*/
for(i=0;i<m;i++)
printf("%s",hc[i]);
system("pause");
TrsHuffmanTree(ht,weight,hc,n,m); /*解码*/
FreeHuffmanCode(h,hc,n,m);
system("pause");
}
2011-09-11 12:25
