// Determines whether datatype is a variable-length string.
// htri_t H5Tis_variable_str( hid_t dtype_id )
func (vl *VarLenType) IsVariableStr() bool {
o := int(C.H5Tis_variable_str(vl.id))
if o > 0 {
return true
}
return false
}
// Reads raw data from a dataset into a buffer.
// herr_t H5Dread(hid_t dataset_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t xfer_plist_id, void * buf )
func (s *Dataset) Read(data interface{}, dtype *Datatype) error {
var addr uintptr
var tmp_slice []byte
post_process := false
v := reflect.ValueOf(data)
//fmt.Printf(":: read[%s]...\n", v.Kind())
switch v.Kind() {
case reflect.Array:
addr = v.UnsafeAddr()
case reflect.Slice:
if v.Index(0).Kind() == reflect.String && C.H5Tis_variable_str(dtype.id) == 0 {
tmp_slice = make([]byte, v.Len()*int(dtype.Size()))
addr = reflect.ValueOf(tmp_slice).Pointer()
post_process = true
} else {
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.UnsafeAddr()
}
rc := C.H5Dread(s.id, dtype.id, 0, 0, 0, unsafe.Pointer(addr))
err := h5err(rc)
if err == nil && post_process {
str_len := int(dtype.Size())
p := 0
for i := 0; i < v.Len(); i++ {
str := tmp_slice[p : p+str_len]
n := bytes.Index(str, []byte{0})
if n < 0 {
n = str_len
}
v.Index(i).SetString(string(str[:n]))
p += str_len
}
}
return err
}
// IsVariableStr determines whether the VarLenType is a string.
func (vl *VarLenType) IsVariableStr() bool {
return C.H5Tis_variable_str(vl.id) > 0
}