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霍夫曼树编码的实现

 2008-03-08 12:43:33 来源:WEB开发网   
核心提示:#include <stdio.h>#include <stdlib.h>#include <string.h>#include <conio.h>typedef strUCt{unsigned int Weight;unsigned int Parent;unsigne

  #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

typedef strUCt
{
  unsigned int Weight;
  unsigned int Parent;
  unsigned int lChild;
  unsigned int rChild;
}HTNode,*HuffmanTree;

typedef char **HuffmanCode;

int LookFor(char *str,char letter,int count);
void OutputWeight(char *Data,int Length,
         char **WhatLetter,
         int **Weight,int *Count);
void HuffmanCoding(HuffmanTree *HT,
          HuffmanCode *HC,
          int *Weight,
          int Count);
void Select(HuffmanTree HT,int Count,int *s1,int *s2);
int main()
{
  HuffmanTree HT;
  HuffmanCode HC;
  char Data[100];
  char *WhatLetter;
  int *Weight;
  int Count;
  int i;

  PRintf("Please input the line:");
  /* Example: aaaaaaaaaaaaaabcccccc*/
  scanf("%s",Data);
  printf("\n");

  OutputWeight(Data,strlen(Data),
         &WhatLetter,
         &Weight,
         &Count);

  HuffmanCoding(&HT,&HC,Weight,Count);

  printf(" Letter Weight Code\n");
  for(i=0;i<Count;i++)
  {
    printf(" %c ",WhatLetter[i]);
    printf("%d ",Weight[i]);

    printf("%s\n",HC[i+1]);
  }
  printf("\n");
  getch();
  return 0;
}

void HuffmanCoding(HuffmanTree *HT,
          HuffmanCode *HC,
          int *Weight,
          int Count)
{
  int i;
  int s1,s2;
  int TotalLength;
  HuffmanTree p;
  char* cd;
  unsigned int c;
  unsigned int f;
  int start;

  if(Count<=1) return;
  TotalLength=Count*2-1;
  (*HT)=(HuffmanTree)malloc((TotalLength+1)*sizeof(HTNode));

  p=((*HT)++);
  for(i=1;i<=Count;i++)
  {
    (*HT)[i].Parent=0;
    (*HT)[i].rChild=0;
    (*HT)[i].lChild=0;
    (*HT)[i].Weight=(*Weight);
    Weight++;
  }
  for(i=Count+1;i<=TotalLength;i++)
  {
    (*HT)[i].Weight=0;
    (*HT)[i].Parent=0;
    (*HT)[i].lChild=0;
    (*HT)[i].rChild=0;
  }
  /*///////////////////Create HuffmanTree////////////////*/
  for(i=Count+1;i<=TotalLength;++i)
  {
    Select((*HT),i-1,&s1,&s2);
    (*HT)[s1].Parent=i;
    (*HT)[s2].Parent=i;
    (*HT)[i].lChild=s1;
    (*HT)[i].rChild=s2;
    (*HT)[i].Weight=(*HT)[s1].Weight+(*HT)[s2].Weight;

  }
  /*///////////////////Output Huffman Code///////////////*/
  (*HC)=(HuffmanCode)malloc((Count+1)*sizeof(char*));
  cd=(char*)malloc(Count*sizeof(char));
  cd[Count-1]='\0';
  for(i=1;i<=Count;++i)
  {
    start=Count-1;
    for(c=i,f=(*HT)[i].Parent;f!=0;c=f,f=(*HT)[f].Parent)
    {
      if((*HT)[f].lChild==c)
        cd[--start]='0';
      else
        cd[--start]='1';
      (*HC)[i]=(char*)malloc((Count-start)*sizeof(char));
      strcpy((*HC)[i],&cd[start]);
    }
  }
}
void Select(HuffmanTree HT,int Count,int *s1,int *s2)
/*/(*s1) is smallest,(*s2) is smaller.*/
{
  int i;
  unsigned int temp1=0;
  unsigned int temp2=0;
  unsigned int temp3;
  for(i=1;i<=Count;i++)
  {
    if(HT[i].Parent==0)
    {
      if(temp1==0)
      {
        &

Tags:霍夫曼 编码 实现

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