encodedb.c

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

void main(int argc,char *argv[])
{
	int data[16];
	char fname[12];
	FILE *fp;

	if(argc < 2)
	{
		printf("请输入数据库文件的完整名称！\n");
        scanf("%s",fname);
		if((fp = fopen(fname,"r+b")) == NULL)
		{
			printf("不能打开数据库文件%s！\n",fname);
			exit(1);
		}
	}
	else
	{
		if((fp = fopen(argv[1],"r+b")) == NULL)
		{
			printf("不能打开数据库文件%s！\n",argv[1]);
			exit(1);
		}
	}
	fread(data,sizeof(int),16,fp);
	/*加密重要数据项*/
	data[2] ^= 0xa1;
	data[3] ^= 0xb2;
	data[4] ^= 0xc3;
	data[5] ^= 0xd4;
	fseek(fp,0l,SEEK_SET);
	fwrite(data,sizeof(int),16,fp);
	fclose(fp);
}