admin管理员组文章数量:1639831
#include<stdio.h>
#include<stdlib.h>
int getfilesize(char *path)
{
FILE *pf = fopen(path, "r");
if (pf == NULL)
{
return -1;
}
else
{
fseek(pf, 0, SEEK_END);
int length = ftell(pf);
return length;
}
}
void copy(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));
fread(p, sizeof(char), length, pfr);
fwrite(p, sizeof(char), length, pfw);
fclose(pfr);
fclose(pfw);
}
}
void jia(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));
fread(p, sizeof(char), length, pfr);
for (int i = 0; i < length; i++)
{
p[i] ^= 'A';
}
fwrite(p, sizeof(char), length, pfw);
fclose(pfr);
fclose(pfw);
}
}
void jie(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));
fread(p, sizeof(char), length, pfr);
for (int i = 0; i < length; i++)
{
p[i] ^= 'A';
}
fwrite(p, sizeof(char), length, pfw);
fclose(pfr);
fclose(pfw);
}
}
void main()
{
char *oldpath = "C:\\Users\\Administrator\\Desktop\\MathType6.9.exe";
char *newpath = "C:\\Users\\Administrator\\Desktop\\MathType6.9a.exe";
char *newjiepath = "C:\\Users\\Administrator\\Desktop\\MathType6.9b.exe";
jia(oldpath, newpath);
jie(newpath, newjiepath);
system("pause");
}
版权声明:本文标题:C语言之文件的加密与解密 内容由热心网友自发贡献,该文观点仅代表作者本人, 转载请联系作者并注明出处:https://www.elefans.com/dianzi/1729294723a1194583.html, 本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容,一经查实,本站将立刻删除。
发表评论