Exemplo n.º 1
1
Arquivo: get.go Projeto: postfix/hdf5
// Get reads data from the file.
func (f *File) Get(name string, something interface{}) error {
	value := reflect.ValueOf(something)
	if value.Kind() != reflect.Ptr {
		return errors.New("expected a pointer")
	}

	value = reflect.Indirect(value)

	cname := C.CString(name)
	defer C.free(unsafe.Pointer(cname))

	did := C.H5Dopen2(f.fid, cname, C.H5P_DEFAULT)
	if did < 0 {
		return errors.New("cannot find the dataset")
	}
	defer C.H5Dclose(did)

	object := newObject()
	defer object.free()

	object.tid = C.H5Dget_type(did)
	if object.tid < 0 {
		return errors.New("cannot get the datatype of the dataset")
	}

	if err := initializeToGet(object, value); err != nil {
		return err
	}

	if C.H5Dread(did, object.tid, C.H5S_ALL, C.H5S_ALL, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot read the dataset from the file")
	}

	if err := finalizeToGet(object, value); err != nil {
		return err
	}

	one := C.hsize_t(1)
	sid := C.H5Screate_simple(1, (*C.hsize_t)(unsafe.Pointer(&one)), nil)
	if sid < 0 {
		return errors.New("cannot create a data space")
	}
	defer C.H5Sclose(sid)

	if C.H5Dvlen_reclaim(object.tid, sid, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot reclaim memory")
	}

	return nil
}
Exemplo n.º 2
0
// Close releases and terminates access to a dataset.
func (s *Dataset) Close() error {
	if s.id > 0 {
		err := C.H5Dclose(s.id)
		s.id = 0
		return h5err(err)
	}
	return nil
}
Exemplo n.º 3
0
// Close releases and terminates access to a dataset.
func (s *Dataset) Close() error {
	if s.id == 0 {
		return nil
	}
	err := h5err(C.H5Dclose(s.id))
	s.id = 0
	return err
}
Exemplo n.º 4
0
Arquivo: put.go Projeto: postfix/hdf5
// Put writes data into the file.
func (f *File) Put(name string, something interface{}, dimensions ...uint) error {
	object := newObject()
	defer object.free()

	if err := initializeToPut(object, reflect.ValueOf(something), dimensions...); err != nil {
		return err
	}

	cname := C.CString(name)
	defer C.free(unsafe.Pointer(cname))

	one := C.hsize_t(1)
	sid := C.H5Screate_simple(1, (*C.hsize_t)(unsafe.Pointer(&one)), nil)
	if sid < 0 {
		return errors.New("cannot create a data space")
	}
	defer C.H5Sclose(sid)

	if result := C.H5Lexists(f.fid, cname, C.H5P_DEFAULT); result < 0 {
		return errors.New("cannot check if the name already exists")
	} else if result > 0 && C.H5Ldelete(f.fid, cname, C.H5P_DEFAULT) < 0 {
		return errors.New("cannot overwrite an existing dataset")
	}

	did := C.H5Dcreate2(f.fid, cname, object.tid, sid, C.H5P_DEFAULT, C.H5P_DEFAULT, C.H5P_DEFAULT)
	if did < 0 {
		return errors.New("cannot create a dataset")
	}
	defer C.H5Dclose(did)

	if C.H5Dwrite(did, object.tid, C.H5S_ALL, C.H5S_ALL, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot write the dataset into the file")
	}

	return nil
}