ca52chek.cpp - v0.2

/*
  ca52chek.cpp (Debugged and Compilable in Dev-C++ 4.9.9.2)
  CA52 - Compression Algorithm 52 - File Header Check
  Coded by [DA2K] Reptor - youtube.com/ReptorULTRA7
*/

#include <iostream>
#include <iomanip>
#include <fstream>
/* CA52 File Struct, Global Vars and Defines
   Get v0.3 header from pastebin.com/1zh50698 */
#include "ca52.h"

using namespace std;

CA52HEADER CA52Head; // input header
string     CA52MethInfo;
string     CA52ErrorMsg;

/******************************************************************************/
void SetCA52Header(uword si,uword ls,uchar cm)
{
  CA52Head.Sig = si;     // file signature
  CA52Head.DataLen = ls; // packed stream size
  CA52Head.Method = cm;  // compression method
}
/******************************************************************************/
bool CheckCA52Header()
{
  bool bMeth;
  uchar i;

  if (CA52Head.Sig==0x52CA) {
    if (CA52Head.DataLen>6) {
      i = 0;
      bMeth = false;
      while (i<3) {
        if (CA52Head.Method==CA52METHOD[i]) { bMeth=true; i=3; }
        else i++;
      }
      if (bMeth) {
        switch (CA52Head.Method) {
          case 0xEF:
             CA52MethInfo = "Ethereum Frontier http-URL Pack";
             break;
          case 0x25:
             CA52MethInfo = "2-Step Stream Crunch";
             break;
          case 0xCD:
             CA52MethInfo = "Compressed Dictionary";
             break;
          default:
             CA52MethInfo = "Unspecified";
             break;
        }
        CA52ErrorMsg = "None";
        return true; // input legit!
      }
      else {
        CA52ErrorMsg = "Compression Method unknown or unsupported!";
        return false; // higher decruncher version required
      }
    }
    else {
      CA52ErrorMsg = "Packed Stream below minimum size!";
      return false; // packed streams under 7 bytes are impossible ;)
    }
  }
  else {
    CA52ErrorMsg = "Not a CA52 Archive!";
    return false; // dumb user gave me bad input file
  }
}
/******************************************************************************/
bool LoadCA52Header(const char *fn)
{
  ifstream fl;
  size_t fs = 0;

  cout << "Input File  : " << fn << endl;

  fl.open(fn, ios::in|ios::binary|ios::ate);
  fl.seekg(0, ios::end);
  fs = fl.tellg(); // get filesize
  if (fs>4) {
    fl.seekg(0, ios::beg);
    fl.read((char*)&CA52Head, sizeof(CA52Head)); // load entire struct
    IsCA52 = CheckCA52Header();
    return true; // legit filesize
  }
  else {
    IsCA52 = false; // no proper header!
    return false; // filesize is below 5 bytes!
  }
  fl.close();
}
/******************************************************************************/
// Decimal to Hex Conversion Macros w/zerofill (double and quad)
#define DHex(x) setfill('0') << setw(2) << uppercase << hex << (int)(x)
#define QHex(x) setfill('0') << setw(4) << uppercase << hex << (int)(x)
// Linefill Macro
#define Line(x) setfill('=') << setw(x) << "="
/******************************************************************************/
int main(int argc, char *argv[])
{
  cout << Line(29) << endl;
  cout << " CA52 - Archive Checker v0.2" << endl;
  cout << Line(29) << endl;
  cout << endl;

  SetCA52Header(CA52HEAD_SIG,0,0x00); // default setting

  if (argc<2) {
    cout << "Usage: " << argv[0] << " filename.ca52" << endl;
    return 1;
  }
  else {
    if ( LoadCA52Header(argv[1]) && IsCA52 ) { // pass filename to loader
      cout << "Data Length : " << CA52Head.DataLen << " Bytes" << endl;
      cout << "Compression : " << CA52MethInfo << " (0x" << DHex(CA52Head.Method) << ")" << endl;
      return 0;
    }
    else {
      cout << "Error Msg   : " << CA52ErrorMsg << endl;
      cout << "Header Data : ";
      cout << "(Sig=0x" << QHex(CA52Head.Sig);
      cout << " /Len=" << CA52Head.DataLen;
      cout << " /Meth=0x" << DHex(CA52Head.Method);
      cout << ")" << endl;
      return -1;
    }
  }
}
/*
  Initial Version 0.1 (2015-12-15)
  Updated Version 0.2 (2015-12-16)
*/