Simple zlib file reading example

This C++ example can read from both compressed and compressed files. It will read from testfile.gz (which can either be compressed or uncompressed) and write the contents to the standard output (screen).

#include "zlib.h"

#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>
#  include <io.h>
#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#  define SET_BINARY_MODE(file)
#endif

#include <iostream>

using namespace std;

int main(void) {

  gzFile f = gzopen("testfile.gz","rb");

  char buffer[1001];

  for(;!gzeof(f);) {

    int e = gzread(f,buffer,1000);
    buffer[1000] = 0;
    cout << buffer << endl;
  }

  gzclose(f);

}

Compile with g++ testprog.cpp -lz -o testprog