/*
 * HexDump
 * (c) Markus Lumpe, V1.0
 *
 */

#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

int main( int argc, char *argv[] )
{
	// check number of arguments
  	if ( argc < 2 )
    {
    	cerr << "Missing argument." << endl;
    	return 1;
    }

	// open streams
  	ifstream lReader;
  	ofstream lOutput;

  	lReader.open( argv[1], ifstream::binary );
  	if ( lReader.fail() )
    {
    	cerr << "Cannot open file \'" << argv[1] << "\'." << endl;
      	return 1;
    }

	string lOutName( argv[1] );
 	lOutName += ".txt";
  	lOutput.open( lOutName.c_str() );
  	if ( lOutput.fail() )
  	{
    	cerr << "Cannot open output file \'" << lOutName.c_str() << "\'." << endl;
    	return 1;
  	}

  	lOutput << "Hex dump of \'" << argv[1] << "\'" << endl << endl;

  	//---- write hex dump -------------------------------------------//

  	unsigned long lCount = 0L;
  	unsigned char lBytes[17];

  	lOutput << uppercase; 	// looks better
	lOutput << hex;			// force hexadecimal

	for ( ; ; )
    {
    	// read next 16 bytes;
      	lReader.read( (char *)lBytes, 16 );
      	int lRead = lReader.gcount();

      	if ( lRead == 0 )
	  	{
	  		break;
	  	}

      	lOutput << setw(8) << setfill('0') << lCount << ": ";

      	for ( int i = 0; i < lRead; i++ )
	  	{
	  		lOutput << " " << setw(2) << setfill('0') << (int)lBytes[i];
	  		if ( i == 8 )
	    	{
	      		lOutput << " |";
	    	}
	  	}

      	// padding
      	if ( lRead < 9 )
    	{
    		cout << "   ";
    	}
    	
      	for ( int i = lRead; i < 16; i++ )
		{
	  		lOutput << "   ";
		}

      	// original text (converted to printable characters)
      	for ( int i = 0; i < lRead; i++ )
		{
	  		if ( (lBytes[i] < 32) || (lBytes[i] > 126) )
	    	{
	      		lBytes[i] = (unsigned char)'.';
	    	}
		}

      	lBytes[lRead] = (unsigned char)'\0';
      	lOutput << "  " << (char *)lBytes << endl;
      	lCount += 16L;

      	if ( lRead < 16 )
		{
	  		break;
		}
	}

  	//----- done ----------------------------------------------------//

  	lReader.close();
  	lOutput.close();
  
  	return 0;
}