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Translate simple C code to Delphi 5

Posted on 2001-06-10
Medium Priority
Last Modified: 2010-04-06
   Please translate this code to Delphi 5 . I need it as soon as possible.
   Requires libdes to compile.

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

int main(int argc, char *argv[])
     FILE *infile, *outfile;

     char *header = "Allaire Cold Fusion Template\012Header Size: ";
     char buffer[54];
     int headsize, outlen;
     int skip_header;
     int len, i;

     char *keystr = "Error: cannot open template file--\"%s\". Please, try again!\012\012";
     des_cblock key;
     des_cblock input;
     des_cblock output;
     des_key_schedule schedule;

     switch (argc)
     case 2:
          outfile = stdout;

     case 3:
          if (!(outfile = fopen(argv[2], "wb")))
               fprintf(stderr, "Error opening output file %s\n", argv[2]);
               return 1;

          fprintf(stderr, "Usage: cfdecrypt <encrypted template> [output file]\n");
          return 1;

     if (!(infile = fopen(argv[1], "rb")))
          fprintf(stderr, "Error opening input file %s\n", argv[1]);
          return 1;

     if ((fread(buffer, 1, 54, infile) < 54) || (memcmp(buffer, header, 42)))
          fprintf(stderr, "File is not an encrypted template\n");
          return 1;

     if (!memcmp(&buffer[42], "New Version", 11))
          headsize = 69;
          skip_header = 1;
          headsize = atoi(&buffer[42]);
          skip_header = 0;

     if ((headsize < 54) || (fseek(infile, headsize, SEEK_SET) < 0))
          fprintf(stderr, "Error in file format\n");
          return 1;

     des_string_to_key(keystr, &key);
     des_set_key(&key, schedule);
     outlen = 0;

     while ((len = fread(input, 1, 8, infile)) == 8)
          des_ecb_encrypt(&input, &output, schedule, 0);
          outlen += 8;
          i = 0;

          if (skip_header)
               while (i < 8)
                    if (output[i++] == 0x1A)
                         skip_header = 0;

          fwrite(output + i, 1, 8 - i, outfile);

     for (i = 0; i < len; i++)
          output[i] = input[i] ^ (outlen + i);

     fwrite(output, 1, len, outfile);

     return 0;
Question by:MrNet
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Expert Comment

ID: 6172933
Look... This code uses module with DES encryption procedures. I think it is impossible to translate it into Delphi code without having at least des.h header file. And I think it is fully impossible to translate it if des.h is not a header file for DLL which provides functions for working with DES encryption until you have another one for Delphi.

Will be happy to know if I am not right...

Best regards,
Alexey Zverev.

Author Comment

ID: 6173125
ok Alexey,

I have exe file already compiled with the prevoius code. I made Delphi project which using the library SellAPI to run the exe with ShellExe() in delphi.

Every thing works fine. The exe run under DOS and the thing that I want happend. BUT I cannot recieve the error message (if error occured) from the exe into my delphi project.

So, You have the C code and you know Delphi. Tell me how to recieve the errors from DOS EXEs.

LVL 20

Accepted Solution

Madshi earned 1200 total points
ID: 6173130
I'm not sure at all, what your real problem is. If I understand your last comment correctly, you are executing a DOS application and want to get the output back. If that is the case, then the following function will perhaps help you. However, I don't see any connection of this to your original question...

Regards, Madshi.

function StartPiped(cmdLine: string) : string;
var sa     : TSecurityAttributes;
    si     : TStartupInfo;
    pi     : TProcessInformation;
    pr, pw : dword;
    dw1    : dword;
  result := '';
  with sa do begin
    nLength              := sizeOf(sa);
    bInheritHandle       := true;
    lpSecurityDescriptor := nil;
  CreatePipe(pr, pw, @sa, 0);
    ZeroMemory(@si, sizeOf(si));
    with si do begin
      cb          := sizeOf(si);
      wShowWindow := SW_HIDE;
      hStdInput   := GetStdHandle(STD_INPUT_HANDLE);
      hStdOutput  := pw;
      hStdError   := pw;
    if CreateProcess(nil, pchar(cmdLine), nil, nil, true, 0, nil, nil, si, pi) then
        WaitForSingleObject(pi.hProcess, INFINITE);
        if PeekNamedPipe(pr, nil, 0, nil, @dw1, nil) and (dw1 > 0) then begin
          SetLength(result, dw1);
          if (not ReadFile(pr, pointer(result)^, dw1, dw1, nil)) or (dw1 = 0) then
            result := '';
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Author Comment

ID: 6173246
OoOoh Madshi, Long time didn't see your answers !! ( I am the absent;) )

In my first question I asked to translate a code, but as alexey said it is impossible I decided to use my already made exe (under DOS) made by the above C code. The problem that I found it that I cannot retrieve the error messages comes out from the exe.

If the exe did his work without any problem, Nothing is output.

If the exe faced a problem, the error message will be the output.

you can see the error messages that may occure on my first question's code.

LVL 20

Expert Comment

ID: 6173465

Have you tried the function I've posted? It might do exactly what you want, namely return the error string a an empty string (for success).

Regards, Madshi.

Author Comment

ID: 6173632

I tried you function. My system got HANG ;)

tell me how to use it.

I have the file decrypt.exe which receive 2 parameters like

d:\decrypt.exe d:\file1.txt d:\file2.txt

LVL 20

Expert Comment

ID: 6173786
Does the DOS exe need input? In that case you can't use SW_HIDE, please try it with:

     wShowWindow := SW_SHOWNORMAL;

Regards, Madshi.

Expert Comment

ID: 6901335
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LVL 14

Expert Comment

ID: 9285670
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