FILERepr.hpp

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#ifndef FILERepr_HPP
#define FILERepr_HPP

#include <stdio.h>
#include <cerrno>
#include "common/log.h"
#include "io/FileReprBase.hpp"  

class FILERepr : public FileReprBase
{
   public:
      typedef FileReprBase::params_t params_t;

      FILERepr( const params_t* par ) 
         throw(std::ios_base::failure) : FileReprBase(par)
      {
         if(par->mode == READ)
         {
            file = fopen(par->file_name,"r");
            if (!file) 
            {
               std::string s(strerror(errno));
               log_err(0,"error opening input file %s: %s", 
                       par->file_name, s.c_str());
               throw std::ios_base::failure(strerror(errno));
            }
         }
         else
         {
            file = fopen(par->file_name, "wt");
            if (!file) 
            {
               std::string s(strerror(errno));
               log_err(0,"error opening output file %s: %s", 
                       par->file_name, s.c_str());
               throw std::ios_base::failure(s);
            }
         }
         setbuffer(file,file_buffer,par->file_buffer_size);
      }

      ~FILERepr()
      {
         if(file)
            fclose(file);
      }
      void rewind()
      {
         fseek(file, SEEK_SET, 0);
      }
      void flush()
      {
         fflush(file);
      }

      std::streamsize readFromFile(char* buffer, std::streamsize buffer_size)
      {
         return fread(buffer,1,buffer_size, file);
      }

      void writeToFile( const char* str, std::streamsize n )
      {
         fwrite( str, n, 1, file );
      }
   protected :
      FILE* file;

};

#endif

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