forked from sbinet/go-hdf5
/
h5d.go
153 lines (124 loc) · 3.5 KB
/
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{id}}
runtime.SetFinalizer(d, (*Dataset).finalizer)
return d
}
func createDataset(id C.hid_t, name string, dtype *Datatype, dspace *Dataspace, dcpl *PropList) (*Dataset, error) {
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 := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
return newDataset(hid), nil
}
func openDataset(id C.hid_t, name string) (*Dataset, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dopen2(id, c_name, P_DEFAULT.id)
if err := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
return newDataset(hid), nil
}
func (s *Dataset) finalizer() {
err := s.Close()
if err != nil {
panic(fmt.Sprintf("error closing dset: %s", err))
}
}
func (s *Dataset) Id() int {
return int(s.id)
}
// Close releases and terminates access to a dataset.
func (s *Dataset) Close() error {
if s.id > 0 {
err := C.H5Dclose(s.id)
s.id = 0
return h5err(err)
}
return nil
}
// 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{}, dtype *Datatype, memspace, filespace *Dataspace) error {
var addr uintptr
v := reflect.ValueOf(data)
switch v.Kind() {
case reflect.Array:
addr = v.UnsafeAddr()
case reflect.String:
str := (*reflect.StringHeader)(unsafe.Pointer(v.UnsafeAddr()))
addr = str.Data
case reflect.Ptr:
addr = v.Pointer()
default:
addr = 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, unsafe.Pointer(addr))
err := h5err(rc)
return err
}
// Read reads raw data from a dataset into a buffer.
func (s *Dataset) Read(data interface{}, dtype *Datatype) error {
return s.ReadSubset(data, dtype, nil, nil)
}
// Write writes raw data from a buffer to a dataset.
func (s *Dataset) Write(data interface{}, dtype *Datatype) error {
var addr uintptr
v := reflect.ValueOf(data)
switch v.Kind() {
case reflect.Array:
addr = v.UnsafeAddr()
case reflect.String:
str := (*reflect.StringHeader)(unsafe.Pointer(v.UnsafeAddr()))
addr = str.Data
case reflect.Ptr:
addr = v.Pointer()
default:
addr = v.Pointer()
}
rc := C.H5Dwrite(s.id, dtype.id, 0, 0, 0, unsafe.Pointer(addr))
err := h5err(rc)
return err
}
// 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)
}