C实现哈夫曼编/译码器
#include<string.h>
#include<stdlib.h>
#include<ctype.h>
int n;
struct node{
int w;
int flag;
char c;
struct node *plink,*llink,*rlink;
char code[50];
}*num[100],*root;
FILE *fp;
char tmpcode[50];
int t=0;
int main(void)
{
int i;
void settree();
void code();
void decode();
void disp() ;
root=(struct node*)malloc(sizeof(struct node));
puts("*******************hfm edit/encode demonstration******************************");
while(1){
start:
puts("1. Initrialization 2.display the list of decoding 3. end");
while(scanf("%d",&i)!=1)
{
while(getchar()!='/n')
continue;
puts("input errors!");
puts("reinpuf");
puts("1. Initrialization 2.display the list of decoding 3. end");
}
switch (i)
{
case 1:
settree();
break;
case 2:
disp();
break;
case 3:
exit(0);
default:
puts("input errors！");
puts("reinpuf！");
goto start;
}
}
}
void settree()
{
int i,j,k;
struct node *p1,*p2,*tmp,*p;
void go(struct node *);
void setcode(struct node *);
void printtree(struct node *);
puts("input the length of charactor");
scanf("%d",&n);
while(getchar()!='/n')
continue;
for(i=0;i<n;i++)
{
p=(struct node *)malloc(sizeof(struct node));
puts("input a charactor");
scanf("%c",&p->c);
while(getchar()!='/n')
continue;
puts("input the weight of the charactor:");
scanf("%d",&p->w);
while(getchar()!='/n')
continue;
p->plink=NULL;
p->rlink=NULL;
p->llink=NULL;
num[i]=p;
}
for(i=0;i<n-1;i++)
{
for(j=i+1;j<n;j++)
{
if(num[i]->w>num[j]->w)
{
tmp=num[i];
num[i]=num[j];
num[j]=tmp;
}
}
}
num[n]=NULL;
k=n;
while(num[1]!=NULL)
{
p=(struct node *)malloc(sizeof(struct node));
p1=num[0];
p2=num[1];
p->llink=p1;
p->rlink=p2;
p->plink=NULL;
p1->plink=p;
p2->plink=p;
p->w=p1->w+p2->w;
for(i=1;i<k;i++)
{
num[i]=num[i+1];
}
k--;
num[0]=p;
for(i=0;i<k-1;i++)
{
for(j=i+1;j<k;j++)
{
if(num[i]->w>num[j]->w)
{
tmp=num[i];
num[i]=num[j];
num[j]=tmp;
}
}
}
}
root=num[0];
if((fp=fopen("c://hfmtree.wxl","wb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
setcode(root);
go(root);
fclose(fp);
}
void setcode(struct node *p)
{
if(p->llink==NULL&&p->rlink==NULL)
{
tmpcode[t]='/0';
strcpy(p->code,tmpcode);
}
else
{
tmpcode[t++]='0';
setcode(p->llink);
t--;
tmpcode[t++]='1';
setcode(p->rlink);
t--;
}
}
void go(struct node *p)
{
if(p->llink==NULL&&p->rlink==NULL)
{
fputc('(',fp);
fputc(p->c,fp);
fputs(p->code,fp);
fputc(')',fp);
}
else
{
go(p->llink);
go(p->rlink);
}
}
void code()
{
FILE *fp1,*fp2,*fp3;
char ch1,ch2,c;
if((fp1=fopen("c://hfmtree.wxl","rb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
if((fp2=fopen("c://tobetrans.txt","rb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
if((fp3=fopen("c://codefile.wxl","wb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
while((ch1=fgetc(fp2))!=EOF)
{
t=0;
while((ch2=fgetc(fp1))!=EOF)
{
if(ch1==ch2)
{
while((c=fgetc(fp1))!=')')
{
tmpcode[t++]=c;
}
tmpcode[t]='/0';
fputs(tmpcode,fp3);
fputc('@',fp3);
rewind(fp1);
break;
}
}
}
fclose(fp1);
fclose(fp2);
fclose(fp3);
}
void decode()
{
FILE *fp1,*fp2,*fp3;
char ch1,ch2,ch3;
char temp_3[20];
char temp_1[20];
int t1,t3;
if((fp1=fopen("c://hfmtree.wxl","rb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
if((fp2=fopen("c://textfile.txt","wb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
if((fp3=fopen("c://codefile.wxl","rb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
while((ch3=fgetc(fp3))!=EOF)
{
t3=0;
while(ch3!='@')
{
temp_3[t3++]=ch3;
ch3=fgetc(fp3);
}
temp_3[t3]='/0';
while((ch1=fgetc(fp1))!=EOF)
{
if(isalpha(ch1))
{
ch2=ch1;
t1=0;
while((ch1=fgetc(fp1))!=')')
{
temp_1[t1++]=ch1;
}
temp_1[t1]='/0';
if(strcmp(temp_1,temp_3)==0)
{
fputc(ch2,fp2);
rewind(fp1);
break;
}
}
}
}
fclose(fp1);
fclose(fp2);
fclose(fp3);
}
void disp(void)
{
FILE *fp1,*fp2;
char ch1,ch2;
char tmp[20];
int t;
if((fp1=fopen("c://hfmtree.wxl","rb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
if((fp2=fopen("c://hfmcode.txt","wb"))==NULL)
{
puts("Openning file is false");
getchar();
exit(0);
}
while((ch1=fgetc(fp1))!=EOF)
{
if(ch1=='(')
{
t=0;
ch1=fgetc(fp1);
ch2=ch1;
while((ch1=fgetc(fp1))!=')')
{
tmp[t++]=ch1;
}
tmp[t]='/0';
printf("%c-----%s/n",ch2,tmp);
fputc(ch2,fp2);
fputc('-',fp2);
fputc('-',fp2);
fputc('-',fp2);
fputs(tmp,fp2);
fputc('/n',fp2);
}
}
fclose(fp1);
fclose(fp2);
}
