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h5d.go
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h5d.go
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package hdf5
// #include "hdf5.h"
// #include <stdlib.h>
// #include <string.h>
import "C"
import (
"fmt"
"reflect"
"runtime"
"unsafe"
)
type Dataset struct {
Location
}
func newDataset(id C.hid_t) *Dataset {
d := &Dataset{Location{Identifier{id}}}
runtime.SetFinalizer(d, (*Dataset).finalizer)
return d
}
func createDataset(id C.hid_t, name string, dtype *Datatype, dspace *Dataspace, dcpl *PropList) (*Dataset, error) {
dtype, err := dtype.Copy() // For safety
if err != nil {
return nil, err
}
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dcreate2(id, c_name, dtype.id, dspace.id, P_DEFAULT.id, dcpl.id, P_DEFAULT.id)
if err := checkID(hid); err != nil {
return nil, err
}
return newDataset(hid), nil
}
func (s *Dataset) finalizer() {
if err := s.Close(); err != nil {
panic(fmt.Errorf("error closing dset: %s", err))
}
}
// Close releases and terminates access to a dataset.
func (s *Dataset) Close() error {
if s.id == 0 {
return nil
}
err := h5err(C.H5Dclose(s.id))
s.id = 0
return err
}
// Space returns an identifier for a copy of the dataspace for a dataset.
func (s *Dataset) Space() *Dataspace {
hid := C.H5Dget_space(s.id)
if int(hid) > 0 {
return newDataspace(hid)
}
return nil
}
// ReadSubset reads a subset of raw data from a dataset into a buffer.
func (s *Dataset) ReadSubset(data interface{}, memspace, filespace *Dataspace) error {
dtype, err := s.Datatype()
defer dtype.Close()
if err != nil {
return err
}
var addr unsafe.Pointer
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.H5Dread(s.id, dtype.id, memspace_id, filespace_id, 0, addr)
err = h5err(rc)
return err
}
// Read reads raw data from a dataset into a buffer.
func (s *Dataset) Read(data interface{}) error {
return s.ReadSubset(data, nil, nil)
}
// 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
}
// Write writes raw data from a buffer to a dataset.
func (s *Dataset) Write(data interface{}) error {
return s.WriteSubset(data, nil, nil)
}
// Creates a new attribute at this location.
func (s *Dataset) CreateAttribute(name string, dtype *Datatype, dspace *Dataspace) (*Attribute, error) {
return createAttribute(s.id, name, dtype, dspace, P_DEFAULT)
}
// Creates a new attribute at this location.
func (s *Dataset) CreateAttributeWith(name string, dtype *Datatype, dspace *Dataspace, acpl *PropList) (*Attribute, error) {
return createAttribute(s.id, name, dtype, dspace, acpl)
}
// Opens an existing attribute.
func (s *Dataset) OpenAttribute(name string) (*Attribute, error) {
return openAttribute(s.id, name)
}
// Datatype returns the HDF5 Datatype of the Dataset
func (s *Dataset) Datatype() (*Datatype, error) {
dtype_id := C.H5Dget_type(s.id)
if dtype_id < 0 {
return nil, fmt.Errorf("couldn't open Datatype from Dataset %q", s.Name())
}
return NewDatatype(dtype_id), nil
}