driver.c

来自「并行算法实验用的源代码」· C语言 代码 · 共 115 行

/********************************************************************
 File:        driver - main included -
 Program use: Crypt
 Lab #:       3
 Description: This file represents a skelleton driver for
              the encryption function. See the file labled
              encrypt.c for it's specifications.

              One note on the encryption function. It will
              only work properly with even length strings.
              So, if you test it with your own strings be
              sure to use even number of strings. If I can
              find a fix for this I will pass it along, however
              it is inconsequetial to this lab.

              Also, your are limited to strings of length 50.
              Again, if you wish to change this go ahead.

 Notes:       Also included with this file are two makefiles:
              makefile and makefile.mpicc. The serial version
              of this program can be compiled with the
              file labled makefile while the file makefile.mpicc
              is the version you should use in compilling you
              parallel version. You may make changes to either
              of these makefiles, but you must submit them
              both.
********************************************************************/
#include <stdlib.h>
#include <stdio.h>

// defines
#define MATCH 0
#define SIZE  60
/*****
   N is a constant used in all the encode and decode
   keys provided in this lab
*****/
#define N     34169 

/*******************************
Function:    driver - main -
********************************/
void main (int argc, char **argv){

  unsigned long int enKey, deKey;
  int           counter;
  char          ch, inStr[SIZE], *tmpStr, outStr[SIZE];
  FILE          *in1, *in2, *out;


    if (argc != 3){ 
      printf("usage: Crypt <input1> <input2>\n"); 
      exit(1); 
    }


  /****
  The encrypted versions of the given text files were
  encrypted with the enKey.
  Your job is to find the deKey (decrypt key). You do
  not need the enKey to find dekey.
  Below is an example two key pair.
  These keys will encrypt and decrypt the code for codeText1 and
  codeEnc1 respectively. This is ment as an example 
  how the program works
  ***/
  enKey = 7253;
  deKey = 12653;

    /********************
      Input file containing the unencrypted string
    ********************/
    strcpy(inStr, "");
    if(! (in1= fopen(argv[1], "rb")) ){ perror(argv[1]); exit(1); }
    counter = 0;
    ch      = getc(in1);
    while(ch != EOF){
      inStr[counter] = ch;
      ch = getc(in1);
      counter++;
    }
    counter--;
    inStr[counter] = '\0';
    fclose(in1);

    /********************
      Output file containing the string from the
      input file encrypted
    ********************/
    strcpy(outStr, "");
    if(! (in2= fopen(argv[2], "rb")) ){ perror(argv[2]); exit(1); }
    counter = 0;
    ch      = getc(in2);
    while(ch != EOF){
      outStr[counter] = ch;
      ch = getc(in2);
      counter++;
    }
    outStr[counter] = '\0';
    fclose(in2);

    /** run encrypt function
    ***/
    tmpStr = (char *)cryptString(outStr, deKey, N);

    if(MATCH == strcmp(inStr, tmpStr)){
      printf("%d\n%s\n", deKey, tmpStr);
    }else{
      printf("NO MATCH\n");
    }
    
}