// 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)))
}
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
}