H5File_misc.hpp

Go to the documentation of this file.

/*
 *  Copyright (c), 2017, Adrien Devresse <adrien.devresse@epfl.ch>
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 *
 */
#ifndef H5FILE_MISC_HPP
#define H5FILE_MISC_HPP
 
#include <string>
 
#include <H5Fpublic.h>
 
#include "../H5Utility.hpp"
 
namespace HighFive {
 
namespace {  // unnamed
 
// libhdf5 uses a preprocessor trick on their oflags
// we can not declare them constant without a mapper
inline unsigned convert_open_flag(unsigned openFlags) {
    unsigned res_open = 0;
    if (openFlags & File::ReadOnly)
        res_open |= H5F_ACC_RDONLY;
    if (openFlags & File::ReadWrite)
        res_open |= H5F_ACC_RDWR;
    if (openFlags & File::Create)
        res_open |= H5F_ACC_CREAT;
    if (openFlags & File::Truncate)
        res_open |= H5F_ACC_TRUNC;
    if (openFlags & File::Excl)
        res_open |= H5F_ACC_EXCL;
    return res_open;
}
}  // namespace
 
 
inline File::File(const std::string& filename, unsigned openFlags,
                  const FileAccessProps& fileAccessProps)
    : _filename(filename) {
 
    openFlags = convert_open_flag(openFlags);
 
    unsigned createMode = openFlags & (H5F_ACC_TRUNC | H5F_ACC_EXCL);
    unsigned openMode = openFlags & (H5F_ACC_RDWR | H5F_ACC_RDONLY);
    bool mustCreate = createMode > 0;
    bool openOrCreate = (openFlags & H5F_ACC_CREAT) > 0;
 
    // open is default. It's skipped only if flags require creation
    // If open fails it will try create() if H5F_ACC_CREAT is set
    if (!mustCreate) {
        // Silence open errors if create is allowed
        std::unique_ptr<SilenceHDF5> silencer;
        if (openOrCreate) silencer.reset(new SilenceHDF5());
 
        _hid = H5Fopen(_filename.c_str(), openMode, fileAccessProps.getId());
 
        if (isValid()) return;  // Done
 
        if (openOrCreate) {
            // Will attempt to create ensuring wont clobber any file
            createMode = H5F_ACC_EXCL;
        } else {
            HDF5ErrMapper::ToException<FileException>(
                std::string("Unable to open file " + _filename));
        }
    }
 
    if ((_hid = H5Fcreate(_filename.c_str(), createMode, H5P_DEFAULT,
                          fileAccessProps.getId())) < 0) {
        HDF5ErrMapper::ToException<FileException>(
            std::string("Unable to create file " + _filename));
    }
}
 
inline const std::string& File::getName() const noexcept {
    return _filename;
}
 
inline void File::flush() {
    if (H5Fflush(_hid, H5F_SCOPE_GLOBAL) < 0) {
        HDF5ErrMapper::ToException<FileException>(
            std::string("Unable to flush file " + _filename));
    }
}
 
}  // namespace HighFive
 
#endif  // H5FILE_MISC_HPP