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// Copyright (C) 1999-2017
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include "mmapincr.h"
#ifndef __WIN32
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
FitsMMapIncr::FitsMMapIncr(const char* fn)
{
// parse the fn and options
parse(fn);
if (!valid_)
return;
// reset
valid_ =0;
if (!pName_)
return;
// Map the file.
int fd = open(pName_, O_RDONLY);
if (fd == -1)
return;
struct stat info;
if (fstat(fd, &info) < 0)
return;
close(fd);
// check to see if we have something, we may have a small array
if (info.st_size <= 0)
return;
filesize_ = info.st_size;
// so far, so good
valid_ = 1;
}
#else
FitsMMapIncr::FitsMMapIncr(const char* fn) {}
#endif
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