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// Copyright (C) 1999-2016
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include "mmap.h"
#ifndef __WIN32
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
FitsMMap::FitsMMap(const char* fn)
{
// parse the fn and options
parse(fn);
if (!valid_)
return;
// reset
valid_ = 0;
if (!pName_)
return;
// Map the file.
int file = open(pName_, O_RDONLY);
if (file == -1)
return;
struct stat info;
if (fstat(file, &info) < 0)
return;
// check to see if we have something, we may have a small array
if (info.st_size <= 0)
return;
// map it
mapsize_ = info.st_size;
mapdata_ = (char*)mmap(NULL, mapsize_, PROT_READ, MAP_SHARED, file, 0);
// close the file
close(file);
// are we valid?
if ((long)mapdata_ == -1)
return;
// so far, so good
valid_ = 1;
}
FitsMMap::~FitsMMap()
{
if (mapdata_>0)
munmap((caddr_t)mapdata_, mapsize_);
}
#else
FitsMMap::FitsMMap(const char* fn) {}
FitsMMap::~FitsMMap() {}
#endif
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