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Forum index » Meta » Various & Sundry

Need help debugging this code
Moderators: Giskard, imbri, ndemeter

Page 1 of 1 [2 Posts]

Author

Message

Hamled
Greenhorn

Joined: 08 Mar 2003
Posts: 7
Location: North Carolina

Need help debugging this code

I realize this isn't really related to ARGs (thats why it's in this forum, I guess), but I've been having a little trouble getting my code (written in C++, for MFC) for an encryption/decryption program to work as well as I'd like...
I'm already on version 2.5 from the bugs I've found and fixed, but there are some others that I can't get....
Of particular note is a problem when decrypting a previously encrypted string... The first letter of the string isn't decrypted back correctly, although all others are. The problem is a bit more complicated than this, but I'd have to explain how the entire program works, for one to fully understand. I'm going to post the most relevant code here, and attach the entire file (the one with the actual encryption/decryption code in it), to this post, and also the zipped entire source, with a compiled version of the program with it.

Code:

void CCrypter1Dlg::OnEncrypt()
{
UpdateData(TRUE);
m_strOutput = _T("");
int    InputLength = m_strInput.GetLength();
int CurCharacter = 0;
int    OverloadBuffer = 0;
int    Modifier = 0;
bool isUpper=false;
int    NumAlpha=GetAlphaCharacters(m_strInput);\
int    CurNum=1;

//Encrypt First Character
CurCharacter=m_strInput.GetAt(0);
isUpper=GetCase(CurCharacter);
CurCharacter=toupper(CurCharacter);
if(CurCharacter >= 'A' && CurCharacter <= 'Z')
{
   if(m_bOnlyAlpha)
      CurCharacter=CurCharacter+NumAlpha;
   else
      CurCharacter=CurCharacter+InputLength;
   if(CurCharacter > 'Z')
      CurCharacter=KeepInBounds(CurCharacter);
}
CurCharacter=ReturnCase(CurCharacter, isUpper);
m_strOutput += CurCharacter;

//Do The Rest
for(int i=1; i<InputLength;i++)
{
   CurCharacter=m_strInput.GetAt(i);
   isUpper=GetCase(CurCharacter);
   CurCharacter=toupper(CurCharacter);
   if(CurCharacter >= 'A' && CurCharacter <= 'Z')
   {
      Modifier = GetModifier(m_strOutput, i);
      if(CurNum%2)
      {
         CurCharacter=CurCharacter+Modifier;
         CurCharacter=KeepInBounds(CurCharacter);
      }
      else
      {
         CurCharacter=CurCharacter-Modifier;
         CurCharacter=KeepInBounds(CurCharacter);
      }
      CurNum++;
   }
   CurCharacter=ReturnCase(CurCharacter, isUpper);
   m_strOutput += CurCharacter;
}
UpdateData(FALSE);

}

void CCrypter1Dlg::OnDecrypt()
{
UpdateData(TRUE);
m_strOutput = _T("");
int    InputLength = m_strInput.GetLength();
int    CurCharacter = 0;
int    OverloadBuffer = 0;
int    Modifier = 0;
bool isUpper=false;
int    NumAlpha=GetAlphaCharacters(m_strInput);
int    CurNum=1;

//Encrypt First Character
CurCharacter=m_strInput.GetAt(0);
isUpper=GetCase(CurCharacter);
CurCharacter=toupper(CurCharacter);
if(CurCharacter >= 'A' && CurCharacter <= 'Z')
{
   if(m_bOnlyAlpha)
      CurCharacter=CurCharacter-NumAlpha;
   else
      CurCharacter=CurCharacter-InputLength;
   if(CurCharacter < 'A')
      CurCharacter=KeepInBounds(CurCharacter);
}
CurCharacter=ReturnCase(CurCharacter, isUpper);
m_strOutput += CurCharacter;

//Do The Rest

for(int i=1; i<InputLength;i++)
{
   CurCharacter=m_strInput.GetAt(i);
   isUpper=GetCase(CurCharacter);
   CurCharacter=toupper(CurCharacter);
   if(CurCharacter >= 'A' && CurCharacter <= 'Z')
   {
      Modifier = GetModifier(m_strInput, i);
      if(CurNum%2)
      {
         CurCharacter=CurCharacter-Modifier;
         CurCharacter=KeepInBounds(CurCharacter);
      }
      else
      {
         CurCharacter=CurCharacter+Modifier;
         CurCharacter=KeepInBounds(CurCharacter);
      }
      CurNum++;
   }
   CurCharacter=ReturnCase(CurCharacter, isUpper);
   m_strOutput += CurCharacter;
}

UpdateData(FALSE);
}

crypter 1dlg.cpp
Description		Download
Filename	crypter 1dlg.cpp
Filesize	6.51KB
Downloaded	116 Time(s)

crypter1.zip
Description		Download
Filename	crypter1.zip
Filesize	33.01KB
Downloaded	140 Time(s)

Posted: Tue Mar 25, 2003 7:46 pm

Hamled
Greenhorn

Joined: 08 Mar 2003
Posts: 7
Location: North Carolina

Well... I fixed it, sorta... now the whole decryption is wrong, but the first character is fine! Razz

Posted: Tue Mar 25, 2003 8:23 pm

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