file.hpp
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#ifndef OSMIUM_UTIL_FILE_HPP
#define OSMIUM_UTIL_FILE_HPP
/*
This file is part of Osmium (http://osmcode.org/libosmium).
Copyright 2013-2016 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <cerrno>
#include <cstddef>
#include <cstdio>
#include <system_error>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef _WIN32
# include <io.h>
# include <windows.h>
#endif
#ifndef _MSC_VER
# include <unistd.h>
#else
// https://msdn.microsoft.com/en-us/library/whx354w1.aspx
# define ftruncate _chsize_s
#endif
#include <osmium/util/cast.hpp>
namespace osmium {
namespace util {
inline size_t file_size(int fd) {
#ifdef _MSC_VER
// Windows implementation
// https://msdn.microsoft.com/en-us/library/dfbc2kec.aspx
auto size = ::_filelengthi64(fd);
if (size == -1L) {
throw std::system_error(errno, std::system_category(), "_filelengthi64 failed");
}
return size_t(size);
#else
// Unix implementation
struct stat s;
if (::fstat(fd, &s) != 0) {
throw std::system_error(errno, std::system_category(), "fstat failed");
}
return size_t(s.st_size);
#endif
}
inline void resize_file(int fd, size_t new_size) {
if (::ftruncate(fd, static_cast_with_assert<off_t>(new_size)) != 0) {
throw std::system_error(errno, std::system_category(), "ftruncate failed");
}
}
inline size_t get_pagesize() {
#ifdef _WIN32
// Windows implementation
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwPageSize;
#else
// Unix implementation
return size_t(::sysconf(_SC_PAGESIZE));
#endif
}
} // namespace util
} // namespace osmium
#endif // OSMIUM_UTIL_FILE_HPP
osmium::util::file_size
size_t file_size(int fd)
Definition: file.hpp:69
osmium::util::get_pagesize
size_t get_pagesize()
Definition: file.hpp:105
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:59
cast.hpp
osmium::util::resize_file
void resize_file(int fd, size_t new_size)
Definition: file.hpp:96