检校验.cpp

基于c语言实现的通信校验程序

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<process.h>
#include <stdlib.h>
void tsimpodd()				//奇校验程序
{
	char sname[10];//结果文件
	int a[80];
	int i;
getname1:	printf("please input your result code file name:\n");
	scanf("%s",sname);
	
	FILE *fp;
	fp=fopen(sname,"r");
	if(fp==NULL)
	{	printf("file open error\n");
		getch();
		exit(0);
	}//打开结果文件

	for(i=0 ; !feof(fp)&&i<=80;i++)
	{	
		a[i]=fgetc(fp)-'0';//将源文件内容转化后输入a数组
	  	if( a[i]!=1&&a[i]!=0&&a[i]!=-49)
		{
			printf("source data error not 0&1\n");
			getch();
			exit(0);
		}  //保证为10序列
	}
		
	
	int t,j;
	for(t=0,j=0 ; j<i-1 ; j++) t=t+a[j];
	if((t+1)%2!=0)
	{
		printf("wrong communication");
		goto getname1;
	}
	

	else
	{
		printf("right communication");
		printf("the source will be output");
		char rname[10];//结果文件
		printf("please input the source code file name you want it saved:\n");
		scanf("%s",rname);

		FILE *fp1;
		fp1=fopen(rname,"w");
		for(j=0 ; j<i-2 ;j++ ) fputc(a[j]+'0',fp1);//输出原码
	
		fclose(fp);
		fclose(fp1);
	}
	return;//关文件，返回

}


void tverodd()				//垂直奇校验程序
{
	char sname[10];//源文件
	int a[80][10];//二维数组
	int i;
getname2:	printf("please input your result code file name:\n");
	scanf("%s",sname);
	
	FILE *fp;
	fp=fopen(sname,"r");
	if(fp==NULL)
	{	
		printf("file open error\n");
		getch();
		exit(0);
		
	}//打开文件

	for(i=0 ; !feof(fp)&&i<=800;i++)
	{	
		a[i/10][i%10]=fgetc(fp)-'0';//读文件为二维数组付值

			
	}
	i--;
	int k;
	
	for(k=0;k<i;k++)
	{
		if(a[k/10][k%10]!=1&&a[k/10][k%10]!=0&&a[k/10][k%10]!=-38&&a[k/10][k%10]!=204)
		{
			printf("source data error not 0&1\n");
			getch();
			exit(0);

		}  //保证为10序列

	}

	int j,t; 
	k=i/10; 

	for(j=0;j<k;j++) 
	{
		t=0;
		for(i=0;i<9;i++) t=t+a[j][i];//求每一行的和
		t=t+1;//实现奇校验

		if(t%2!=0)
		{
			printf("wrong communication");
			goto getname2;
		}

	}

		
	for(j=0;j<=8;j++) 
	{
		t=0;
		for(i=0;i<=k;i++) t=t+a[i][j];//求每一列的和
		t=t+1;//实现奇校验
		
		if(t%2!=0)
		{
			printf("wrong communication");
			goto getname2;
		}
	}

	
	printf("right communication");
	printf("the source will be output");
	char rname[10];//结果文件
	printf("please input the source code file name you want it saved:\n");
	scanf("%s",rname);//获得结果文件名

	FILE *fp1;
	fp1=fopen(rname,"w");
	for(j=0 ; j<=k-1 ;j++ )
		for(i=0;i<=7;i++) 
			fputc(a[j][i]+'0',fp1);//输出到结果文件
	
	fclose(fp);
	fclose(fp1);
	return;//关文件，返回

}

void tcrc()
{
	char sname[10],pname[10],rname[10];//源文件、校验码组，结果文件
	int a[128],b[40],c[80],r[40];//a源，b检验序列,c模二结果，r模二余
	int i,j,t,k;

	
getname3:	printf("please input your source code file name:\n");
	scanf("%s",sname);
	printf("please input your p(x) code file name:\n");
	scanf("%s",pname);

	FILE *fp1,*fp,*fp2;
	
	fp=fopen(sname,"r");
	if(fp==NULL)
	{	
		printf("file open error\n");
		getch();
		exit(0);
	}//打开文件

	fp1=fopen(pname,"r");
	if(fp1==NULL)
	{	
		printf("file open error\n");
		getch();
		exit(0);
		
	}//打开文件


	for(i=0 ; !feof(fp)&&i<=128;i++)
	{	
		a[i]=fgetc(fp)-'0';//将源文件内容转化后输入a数组
	 	if( a[i]!=1&&a[i]!=0&&a[i]!=-49)
		{
			printf("source data error\n");
			getch();
			exit(0);
		} //保证为10序列
	}


	for(j=0 ; !feof(fp1)&&j<=40;j++)
	{	
		b[j]=fgetc(fp1)-'0';//将校验码文件内容转化后输入b数组
	  	if( b[j]!=1&&b[j]!=0&&b[j]!=-49 )
		{
			printf("source data error\n");
			getch();
			exit(0);
		} //保证为10序列 
	}


	i--;
	j--;//计数
	
	for(k=0;k<j;k++)
		r[k]=a[k];


	for(t=0;t<=i-j;t++)
	{
 		if(r[0]==0)
		{
			c[t]=0;

			if(t!=i-j)
			{
				for(k=0;k<j-1;k++)
				r[k]=r[k+1];
			
				r[j-1]=a[t+j];
			}
		}

		

		else	
		{
			
			c[t]=1;
			for(k=0;k<j;k++)
				r[k]=(b[k]+r[k])%2;
			if(t!=i)
			{
				for(k=0;k<j-1;k++)
					r[k]=r[k+1];
				r[j-1]=a[t+j];
			}
		}
	}


	for(k=0;k<j;k++)
	{	
		if (r[k]!=0)
		{
			printf("wrong communication");
			goto getname3;
		}
	}

	printf("right communication");
	printf("the source will be output");
	printf("please input the source code file name you want it saved:\n");
	scanf("%s",rname);//获得结果文件名
		
	fp2=fopen(rname,"w");

	for(k=0;k<i-j;k++)
		fputc(a[k]+'0',fp2);
		
	fclose(fp);
	fclose(fp1);
	fclose(fp2);
	return;//关文件，返回

}


void main()
{
begin:	printf("please choose error-correct way:\n");
		printf("(1)test for simple odd:\n");
		printf("(2)test for vericle odd:\n");
		printf("(3)test for crc test:\n");
	
		int n;
		scanf("%d",&n);
	
		switch(n)
		{
		case 1:tsimpodd();break;
		case 2:tverodd();break;
 		case 3:tcrc();break;
		default:printf("wrong number.\n");goto begin;
		}

		getch();

}