Beispiel #1
0
// Retrieves the offset of a field of a compound datatype.
// size_t H5Tget_member_offset( hid_t dtype_id, unsigned memb_no )
func (t *CompType) MemberOffset(mbr_idx int) int {
	return int(C.H5Tget_member_offset(t.id, C.uint(mbr_idx)))
}
Beispiel #2
0
func finalizeStructToGet(object *object, value reflect.Value) error {
	typo := value.Type()
	count := typo.NumField()

	for i := 0; i < count; i++ {
		field := typo.Field(i)
		if len(field.PkgPath) > 0 {
			continue
		}

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

		j := C.H5Tget_member_index(object.tid, cname)
		if j < 0 {
			continue
		}

		o := object.new()

		o.tid = C.H5Tget_member_type(object.tid, C.uint(j))
		if o.tid < 0 {
			return errors.New("cannot get the datatype of a field")
		}

		if cid := C.H5Tget_class(o.tid); cid < 0 {
			return errors.New("cannot get the data class of a field")
		} else if cid == C.H5T_VLEN {
			if tid := C.H5Tget_super(o.tid); tid < 0 { // Close?
				return errors.New("cannot get the base type of a field")
			} else {
				o = object.new()
				o.tid = tid
			}
		}

		if err := initializeToGet(o, value.Field(i)); err != nil {
			return err
		}

		size := C.H5Tget_size(o.tid)
		if size < 0 {
			return errors.New("cannot get a size")
		}

		offset := C.H5Tget_member_offset(object.tid, C.uint(j))
		address := unsafe.Pointer(uintptr(object.data) + uintptr(offset))

		if o.flag&flagVariableLength != 0 {
			h := (*C.hvl_t)(address)
			if h.len != 1 {
				return errors.New("expected a variable-length datatype with a single element")
			}
			address = h.p
		}

		C.memcpy(o.data, address, size)

		if err := finalizeToGet(o, value.Field(i)); err != nil {
			return err
		}
	}

	return nil
}