// 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
}
// 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
}
// 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
}
// 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
}