adler.cpp

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/*
 * calculates adler32 checksum of standard input or file in the 1st parameter
 *
 */

#include <xstream/digest.h>

#include <iostream>
#include <fstream>

using namespace std;;
using namespace xstream;;


int main(int argc, char* argv[]){

   const size_t len = 4*1024;
   char buf[len];

   istream* readfrom;

   try{
      if(1<argc){
         readfrom = new ifstream(argv[1]);
      }else{
         readfrom = &cin;
      }

      digest::adler32 ad;
      ostream out(&ad);

      //raise exceptions
      out.exceptions(ios::badbit);


      while(readfrom->good()){
         readfrom->read(buf,len);
         out.write(buf,readfrom->gcount());
      }

      out.flush();
      clog<<"Adler32 = "<< (ad.digest()) <<endl;

   }
   catch(exception& e){
      cerr<<"Error: "<<e.what()<<endl;
   }


   //pointers not being freed

   return 0;
}