// NewCompoundType creates a new CompoundType.
// size is the size in bytes of the compound datatype.
func NewCompoundType(size int) (*CompoundType, error) {
id := C.H5Tcreate(C.H5T_class_t(T_COMPOUND), C.size_t(size))
if err := checkID(id); err != nil {
return nil, err
}
t := &CompoundType{Datatype{Location{Identifier{id}}}}
runtime.SetFinalizer(t, (*CompoundType).finalizer)
return t, nil
}
func initializeStructToPut(object *object, value reflect.Value) error {
typo := value.Type()
size := C.size_t(typo.Size())
object.data = C.malloc(size)
if object.data == nil {
return errors.New("cannot allocate memory")
}
object.flag |= flagOwnedMemory
object.tid = C.H5Tcreate(C.H5T_COMPOUND, size)
if object.tid < 0 {
return errors.New("cannot create a compound datatype")
}
count := typo.NumField()
for i := 0; i < count; i++ {
field := typo.Field(i)
if len(field.PkgPath) > 0 {
continue
}
o := object.new()
if err := initializeToPut(o, value.Field(i)); err != nil {
return err
}
address := unsafe.Pointer(uintptr(object.data) + uintptr(field.Offset))
if o.flag&flagVariableLength != 0 {
tid := C.H5Tvlen_create(o.tid)
if tid < 0 {
return errors.New("cannnot create a variable-length datatype")
}
// NOTE: It is assumed here that sizeof(hvl_t) <= v.Type().Size().
h := (*C.hvl_t)(address)
h.len, h.p = 1, o.data
o = object.new()
o.tid = tid
} else {
C.memcpy(address, o.data, C.size_t(value.Field(i).Type().Size()))
}
cname := C.CString(field.Name)
defer C.free(unsafe.Pointer(cname))
if C.H5Tinsert(object.tid, cname, C.size_t(field.Offset), o.tid) < 0 {
return errors.New("cannot construct a compound datatype")
}
}
return nil
}
// Creates a new datatype.
// hid_t H5Tcreate( H5T_class_t class, size_tsize )
func CreateDataType(class TypeClass, size int) (t *DataType, err error) {
t = nil
err = nil
hid := C.H5Tcreate(C.H5T_class_t(class), C.size_t(size))
err = togo_err(C.herr_t(int(hid)))
if err != nil {
return
}
t = new_dtype(hid, _type_cls_to_go_type[class])
return
}
// CreateDatatype creates a new datatype.
// class must be T_COMPUND, T_OPAQUE, T_ENUM or T_STRING.
// size is the size of the new datatype in bytes.
func CreateDatatype(class TypeClass, size int) (*Datatype, error) {
_, ok := parametricTypes[class]
if !ok {
return nil, fmt.Errorf(
"invalid TypeClass, want %v, %v, %v or %v, got %v",
T_COMPOUND, T_OPAQUE, T_STRING, T_ENUM)
}
hid := C.H5Tcreate(C.H5T_class_t(class), C.size_t(size))
err := h5err(C.herr_t(int(hid)))
if err != nil {
return nil, err
}
return NewDatatype(hid), nil
}