#include <stdio.h>
#include <strstream.h>

class HexReader
{
public:
  HexReader(const char* filename);
  ~HexReader();
  
  bool eof() { return m_EndOfFile; }
  unsigned long getByte();
  unsigned long getAddress();
  void dump();
  
private:
  // Read some hex digits from the current line
  unsigned long getHex(int length);
  
  // PreFetch Next Byte
  void PreFetch();
  unsigned long m_PreFetchByte;

  // Running Check Sum Count
  unsigned long m_CheckSumCalc;

  // Input file pointer
  FILE* m_InputFile;

  // Address info 
  unsigned long m_ExtendedAddress;
  unsigned long m_Address;

  // Current Line and a strstream to parse it
  char m_CurrentLine[256];
  istrstream* m_Parser;

  // Record of where in the file you are
  bool m_EndOfFile;
  bool m_LineStarted;
  unsigned long m_BytesToEndOfLine;
};