// Micheal H. McCabe
// October 8, 2022
// Hexadecimal Dump of card / tape files
// Part of the Retrochallenge 2022/10

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

string Hex="0123456789ABCDEF";
string PrintHex4(int V);
string PrintHex2(int V);

int main(int argc,char *argv[])
{
	if (argc > 0)
	{
	  cout << "HexDump Version 2" << endl;
   	  cout << "\nFilename: " << argv[1] << endl << endl;
	
	  streampos size;
	  char * memblock;
	  ifstream infile(argv[1], ios::in|ios::binary|ios::ate);

	  if (infile.is_open())
	    	{
		       size = infile.tellg();
		       if (size>65535)
		         {
		            cout << "Filesize too large for this program. 64k Maximum exceeded." << endl;
		            return 0;
			     }
		       memblock = new char [size];
               infile.seekg(0, ios::beg);
               infile.read(memblock, size);
               infile.close();

            for (int address=0; address<=size; address=address+16)
              {
                cout << PrintHex4(address) << ": ";
                string TextLine = "  /* ";
                for (int addr2=0; addr2<16; addr2++)
                  {
                    int byte;
                    int vector=address+addr2;
                    if (vector<=size)
                      {
                        byte=int(memblock[vector]);
                        if ((byte>32) && (byte<127))
                          {
						    TextLine=TextLine+memblock[vector];
					      }
					    else TextLine=TextLine+".";
                      }
                    else 
				      {
				        byte = 0;
				        TextLine=TextLine+".";
			          }
                    cout << PrintHex2(byte) << " ";
				  }
			   cout << TextLine << " */" << endl;
			  }
		    }
   }
	
   return 0;
}

string PrintHex4(int v)
  {
  	int page=v/256;
  	int byte=v-(page*256);
  	string addr = PrintHex2(page)+PrintHex2(byte);
	return addr;
  }
  
string PrintHex2(int v)
  { 
     string Hex="0123456789ABCDEF";
	 int h=v/16;
	 int l=v-(h*16);
	 string data = Hex.substr(h,1)+Hex.substr(l,1);
	 return data;
  }