Exemple #1
0
// Writes raw data from a buffer to a dataset.
// herr_t H5Dwrite(hid_t dataset_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t xfer_plist_id, const void * buf )
func (s *DataSet) Write(data interface{}, dtype *DataType) error {
	var addr uintptr
	v := reflect.ValueOf(data)

	//fmt.Printf(":: write[%s]...\n", v.Kind())
	switch v.Kind() {

	case reflect.Array:
		addr = v.UnsafeAddr()

	case reflect.Slice:
		addr = v.Pointer()

	case reflect.String:
		str := (*reflect.StringHeader)(unsafe.Pointer(v.UnsafeAddr()))
		addr = str.Data

	case reflect.Ptr:
		addr = v.Pointer()

	default:
		addr = v.Pointer()
	}

	rc := C.H5Dwrite(s.id, dtype.id, 0, 0, 0, unsafe.Pointer(addr))
	err := togo_err(rc)
	return err
}
Exemple #2
0
// WriteSubset writes a subset of raw data from a buffer to a dataset.
func (s *Dataset) WriteSubset(data interface{}, memspace, filespace *Dataspace) error {
	dtype, err := s.Datatype()
	defer dtype.Close()
	if err != nil {
		return err
	}

	addr := unsafe.Pointer(nil)
	v := reflect.Indirect(reflect.ValueOf(data))

	switch v.Kind() {

	case reflect.Array:
		addr = unsafe.Pointer(v.UnsafeAddr())

	case reflect.Slice:
		slice := (*reflect.SliceHeader)(unsafe.Pointer(v.UnsafeAddr()))
		addr = unsafe.Pointer(slice.Data)

	case reflect.String:
		str := (*reflect.StringHeader)(unsafe.Pointer(v.UnsafeAddr()))
		addr = unsafe.Pointer(str.Data)

	case reflect.Ptr:
		addr = unsafe.Pointer(v.Pointer())

	default:
		addr = unsafe.Pointer(v.UnsafeAddr())
	}

	var filespace_id, memspace_id C.hid_t = 0, 0
	if memspace != nil {
		memspace_id = memspace.id
	}
	if filespace != nil {
		filespace_id = filespace.id
	}
	rc := C.H5Dwrite(s.id, dtype.id, memspace_id, filespace_id, 0, addr)
	err = h5err(rc)
	return err
}
Exemple #3
0
// 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
}