file_size.hpp

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#ifndef SILICIUM_FILE_SIZE_HPP
#define SILICIUM_FILE_SIZE_HPP

#include <silicium/file_handle.hpp>
#include <silicium/error_or.hpp>
#include <silicium/get_last_error.hpp>

#ifndef _WIN32
#   include <sys/stat.h>
#endif

namespace Si
{
    inline Si::error_or<Si::optional<boost::uint64_t>> file_size(Si::native_file_descriptor file)
    {
#ifdef _WIN32
        LARGE_INTEGER size;
        if (!GetFileSizeEx(file, &size))
        {
            return get_last_error();
        }
        assert(size.QuadPart >= 0);
        return static_cast<boost::uint64_t>(size.QuadPart);
#else
        struct stat buffer;
        if (fstat(file, &buffer) < 0)
        {
            return get_last_error();
        }
        if ((buffer.st_mode & S_IFMT) != S_IFREG)
        {
            return Si::none;
        }
        return static_cast<boost::uint64_t>(buffer.st_size);
#endif
    }
}

#endif