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分类: C/C++

2007-11-09 18:38:56

This is a program for coding and decoding file.The principle is quite simple.Only by xor the orignal file with a 512 byte key file character by character.The difficult part is how to analysis the path form the full file name.
This is my first command line program.

#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#include "string.h"
#include "define.h"
#include "unistd.h"

/* This function is used to show the instruction. */
void vInstruction(void)
{
     printf("This program can produce a 512 byte key-file");
     printf(" and/or protect the selected file.\n");
     printf("Copyright 2006-2007 (C) Northeastern University at Qinhuangdao\n");
     printf(" All Rights Reserved\n\n");
     printf("CODETEST [-P] [-U] [-C] [-K:keyfile] [-S:source]/[-D:destination]\n\n");
     printf(" -s:source Specifies the file to be coded or decoded.\n");
     printf(" [-p] Use this parameter to protect your file.\n");
     printf(" [-u] Use this parameter to unprotect your file.\n");
     printf(" [-c] Use this parameter to creat your key file.\n");
     printf(" -k:keyfile Specifies the directory and/or filename of the key file.\n");
     printf(" -d:destination Specifies the directory and/or filename for the new file.\n\n");
     printf("The switch -p may be preset in the program ,so I advise you that before ");
     printf("you use this program , make sure that you did know what you are doing.");
     printf("The producter \nrefuse to take any clear or potential responsibility for");
     printf(" the correct or uncorre-ct use of this program.Have Fun and Good Luck.\n\n");
     system("pause");
     exit(0);
}

/* This function is used to creat the key string */
void vCreatKey(char sTemp[])
{
     int iNum,iTemp;
     srand( (unsigned)time(NULL));
     for (iNum = 0; iNum <= 511; iNum++)
     while((iTemp = (char)(rand()%10))!=0x00)
     sTemp[iNum] = iTemp;
}

/* This function is used to creat the key file in ascii mode */
int iSaveFile(char sFilePath[],char sKey[])
{
    FILE *fpTemp;
    int iNum=0;
    if( ( fpTemp=fopen(sFilePath,"wb+") )==NULL)
    {
        printf("File Creat Error!");
        return 0;
    }
    else
    while(iNum<512)
    {
         putc(sKey[iNum],fpTemp);
         iNum++;
    }
    fclose(fpTemp);
    printf("Key File Has Been Created\n");
    return 1;
}

/* This function is used to find the path of the orginal file. */
void vFindPath(char sTemp[])
{
     int iNum;
     for (iNum=strlen(sTemp);iNum>=0;iNum--)
     {
         if (sTemp[iNum]=='\\') break;
         sTemp[iNum]='\0';
     }
}

/* This function is used to find the real file name whitout path */
void vFindFileName(char sPath[],char sFilePreName[],char sFileLstName[])
{
     char sOri[50];
     int iNum,iNumB;
     strcpy(sOri,sPath);
     vFindPath(sPath);
     for (iNum = strlen(sPath);iNum <= 50;iNum++)
     {
         if(sOri[iNum]=='.')
         {
             sFilePreName[iNum-strlen(sPath)] = '\0';
             break;
         }
         sFilePreName[iNum-strlen(sPath)] = sOri[iNum];
     };
     iNumB=iNum+1;
     for (iNum=iNum+1;iNum <= 50;iNum++)
     {
         sFileLstName[iNum-iNumB] = sOri[iNum];
         if(sOri[iNum]=='\0')break;
     };
}

/* This function is used to read file and save it to a string */
void vReadKeyFile(char sTemp[],char sKeyFilePath[])
{
     FILE *fpTemp;
     int iNum=0;
     if( ( fpTemp=fopen(sKeyFilePath,"rb") )==NULL)
     {
         printf("File Read Error!");
     }
     else
     {
         for(iNum=0;iNum<=511;iNum++)
         sTemp[iNum]=fgetc(fpTemp);
     }
}

/* This function is used to protect or unprotect the file */
void vProtectFile(char sSrcFile[],char sDstFile[],char sKeyFile[])
{
     FILE *fpTempA,*fpTempB;
     int iNum;
     char sTemp[512],cTemp;
     vReadKeyFile(sTemp,sKeyFile);
     if( (fpTempA = fopen(sSrcFile,"rb"))==NULL )
     {
         printf("Open Source File Error!");
         exit(0);
     }
     else if( (fpTempB = fopen(sDstFile,"wb"))==NULL )
     {
          printf("Open Destination File Error!");
          exit(0);
     }
     else
     {
          for(iNum=0;iNum<=511;iNum++)
          {
              cTemp=fgetc(fpTempA);
              if(feof(fpTempA))
              {
                  break;
              }
              fputc( (cTemp^sTemp[iNum]),fpTempB );
              if(iNum==511)iNum=0;
          }
          fclose(fpTempA);
          fclose(fpTempB);
     }
}

/* This function is used to copy one file to a temp file */
void vCopyFile(char sSrcPath[],char sDstPath[])
{
     FILE *fpTempA,*fpTempB;
     char cTemp;
     if ( (fpTempA=fopen(sSrcPath,"rb"))==NULL )
     {
          printf("Source File Open Error!");
          exit(0);
     }
     else if ( (fpTempB=fopen(sDstPath,"wb"))==NULL )
     {
          printf("Temp File Creat Error!");
          exit(0);
     }
     else
     {
         while(1)
         {
                 cTemp=fgetc(fpTempA);
                 if(feof(fpTempA))break;
                 fputc(cTemp,fpTempB);
         }
         fclose(fpTempA);
         fclose(fpTempB);
     }
}

/* This is the Entry Point of the program */
int main(int argc, char **argv)
{
    char cParameter,sSrcPath[50],sDstPath[50],sKeyPath[50];
    char sTemp[512],sFilePreName[20],sFileLstName[6],sFileName[20];
    char sSrcPathA[50],sSrcPathB[50],sFilePreNameA[50],sFileLstNameA[50];
    int iCheck=0,iNum;
    if (argc==1)vInstruction();
    while( ( cParameter = getopt(argc,argv,"s:d:k:ucp") ) != -1 )
    switch(cParameter)
    {
              case 's':
              strcpy(sSrcPath,optarg);iCheck |= P_SRC; break;
              
              case 'd':
              strcpy(sDstPath,optarg);iCheck |= P_DST; break;
              
              case 'k':
              strcpy(sKeyPath,optarg);iCheck |= P_KEY; break;
              
              case 'u':
              iCheck |= P_UP; break;
              
              case 'c':
              iCheck |= P_CKEY; break;
              
              case 'p':
              iCheck |= P_PROTECT; break;
              
              default:
              iCheck = 0;
    }
    
    switch(iCheck)
    {
              case (P_CKEY):
              vCreatKey(sTemp);
              iSaveFile("key.sys",sTemp);
              break;
              
              case (P_CKEY|P_DST):
              vCreatKey(sTemp);
              iSaveFile(sDstPath,sTemp);
              break;
              
              case (P_SRC):
              case (P_SRC|P_PROTECT):
              vCreatKey(sTemp);
              strcpy(sSrcPathA,sSrcPath);
              vFindFileName(sSrcPath,sFilePreName,sFileLstName);
              strcpy(sSrcPathB,sSrcPath);
              strcpy(sFilePreNameA,sFilePreName);
              strcpy(sKeyPath,strcat(sSrcPath,strcat(sFilePreName,".key")));
              iSaveFile(sKeyPath,sTemp);
              strcpy(sDstPath,sSrcPathA);
              strcpy(sFilePreName,sFilePreNameA);
              strcpy(sSrcPath,sSrcPathB);
              strcpy(sFileName,strcat(sSrcPath,strcat(sFilePreName,".bak")));
              vCopyFile(sSrcPathA,sFileName);
              vProtectFile(sFileName,sDstPath,sKeyPath);
              printf("Operation Down");
              break;
              
              case (P_SRC|P_UP|P_DST):
              case (P_SRC|P_DST):
              case (P_SRC|P_PROTECT|P_DST):
              vCreatKey(sTemp);
              strcpy(sSrcPathA,sSrcPath);
              vFindFileName(sSrcPath,sFilePreName,sFileLstName);
              strcpy(sSrcPathB,sSrcPath);
              strcpy(sFilePreNameA,sFilePreName);
              strcpy(sKeyPath,strcat(sSrcPath,strcat(sFilePreName,".key")));
              iSaveFile(sKeyPath,sTemp);
              strcpy(sFilePreName,sFilePreNameA);
              strcpy(sSrcPath,sSrcPathB);
              strcpy(sFileName,strcat(sSrcPath,strcat(sFilePreName,".bak")));
              vCopyFile(sSrcPathA,sFileName);
              vProtectFile(sFileName,sDstPath,sKeyPath);
              printf("Operation Down");
              break;
              
              case (P_SRC|P_DST|P_KEY):
              case (P_SRC|P_DST|P_KEY|P_UP):
              case (P_SRC|P_DST|P_KEY|P_PROTECT):
              strcpy(sSrcPathA,sSrcPath);
              vFindFileName(sSrcPath,sFilePreName,sFileLstName);
              strcpy(sFileName,strcat(sSrcPath,strcat(sFilePreName,".bak")));
              vCopyFile(sSrcPathA,sFileName);
              vProtectFile(sFileName,sDstPath,sKeyPath);
              printf("Operation Down");
              break;
              
              case (P_SRC|P_KEY):
              case (P_SRC|P_UP|P_KEY):
              case (P_SRC|P_PROTECT|P_KEY):
              strcpy(sSrcPathA,sSrcPath);
              vFindFileName(sSrcPath,sFilePreName,sFileLstName);
              strcpy(sDstPath,sSrcPathA);
              strcpy(sFileName,strcat(sSrcPath,strcat(sFilePreName,".bak")));
              vCopyFile(sSrcPathA,sFileName);
              vProtectFile(sFileName,sDstPath,sKeyPath);
              printf("Operation Down");
              break;
              
              default:
              vInstruction();
    }
    return 0;
}

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