加密解密算法1

int Password(const char* str)
{
 FILE* pf = NULL;
 pf = fopen(str,"rb");
 if (pf == NULL)
 {
  return 0;
 }
 char buf[MAX_BUFFER_SIZE_PASSWORD] = {0};
 int len = 0;
 fseek(pf,0,SEEK_END );
 len = ftell(pf);
 char bufw[MAX_BUFFER_SIZE_PASSWORD] = {0};
 if (len > MAX_BUFFER_SIZE_PASSWORD)
 {
  return 0;
 }
 rewind(pf);
 fread(buf,1,len,pf);
 for (int i = len;i>=0;i--)
 {
  bufw[i] = (buf[i]>>6&3) | ((buf[i]>>4&3)<<6) | ((buf[i] & 0xc) | (buf[i]&3)<<4);
 }

 fclose(pf);
 FILE* pfw = NULL;
 string strFileName = "解密";
 strFileName += str;
 pfw = fopen(strFileName.c_str(),"w+b");
 if (pfw == NULL)
 {
  return 0;
 }
 fwrite(bufw,1,len,pfw);
 fclose(pfw);
 return 1;
}