forked from sbinet/go-hdf5
/
h5g.go
126 lines (105 loc) · 3.65 KB
/
h5g.go
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package hdf5
// #include "hdf5.h"
// #include "hdf5_hl.h"
// #include <stdlib.h>
// #include <string.h>
import "C"
import (
"fmt"
"runtime"
"unsafe"
)
// CommonFG is for methods common to both File and Group
type CommonFG struct {
Location
}
// Group is an HDF5 container object. It can contain any Location.
type Group struct {
CommonFG
}
// CreateGroup creates a new empty group and links it to a location in the file.
func (g *CommonFG) CreateGroup(name string) (*Group, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
link_flags := C.hid_t(C.H5P_DEFAULT)
grp_c_flags := C.hid_t(C.H5P_DEFAULT)
hid := C.H5Gcreate2(g.id, c_name, link_flags, grp_c_flags, P_DEFAULT.id)
if err := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
group := &Group{CommonFG{Location{Identifier{hid}}}}
runtime.SetFinalizer(group, (*Group).finalizer)
return group, nil
}
// CreateDataset creates a new Dataset.
func (g *CommonFG) CreateDataset(name string, dtype *Datatype, dspace *Dataspace) (*Dataset, error) {
return createDataset(g.id, name, dtype, dspace, P_DEFAULT)
}
// CreateDatasetWith creates a new Dataset with a user-defined PropList.
func (g *CommonFG) CreateDatasetWith(name string, dtype *Datatype, dspace *Dataspace, dcpl *PropList) (*Dataset, error) {
return createDataset(g.id, name, dtype, dspace, dcpl)
}
func (g *Group) finalizer() {
err := g.Close()
if err != nil {
panic(fmt.Sprintf("error closing group: %s", err))
}
}
// Close closes the Group.
func (g *Group) Close() error {
return h5err(C.H5Gclose(g.id))
}
// OpenGroup opens an existing child group from this Group.
func (g *CommonFG) OpenGroup(name string) (*Group, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Gopen2(g.id, c_name, P_DEFAULT.id)
if err := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
group := &Group{CommonFG{Location{Identifier{hid}}}}
runtime.SetFinalizer(group, (*Group).finalizer)
return group, nil
}
// OpenDataset opens a named Dataset.
func (g *CommonFG) OpenDataset(name string) (*Dataset, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dopen2(g.id, c_name, P_DEFAULT.id)
if err := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
return newDataset(hid), nil
}
// NumObjects returns the number of objects in the Group.
func (g *CommonFG) NumObjects() (uint, error) {
var info C.H5G_info_t
err := h5err(C.H5Gget_info(g.id, &info))
return uint(info.nlinks), err
}
// ObjectNameByIndex returns the name of the object at idx.
func (g *CommonFG) ObjectNameByIndex(idx uint) (string, error) {
cidx := C.hsize_t(idx)
size := C.H5Lget_name_by_idx(g.id, cdot, C.H5_INDEX_NAME, C.H5_ITER_INC, cidx, nil, 0, C.H5P_DEFAULT)
if size < 0 {
return "", fmt.Errorf("could not get name")
}
name := make([]C.char, size+1)
size = C.H5Lget_name_by_idx(g.id, cdot, C.H5_INDEX_NAME, C.H5_ITER_INC, cidx, &name[0], C.size_t(size)+1, C.H5P_DEFAULT)
if size < 0 {
return "", fmt.Errorf("could not get name")
}
return C.GoString(&name[0]), nil
}
// CreateTable creates a packet table to store fixed-length packets.
func (g *Group) CreateTable(name string, dtype *Datatype, chunkSize, compression int) (*Table, error) {
return createTable(g.id, name, dtype, chunkSize, compression)
}
// CreateTableFrom creates a packet table to store fixed-length packets.
func (g *Group) CreateTableFrom(name string, dtype interface{}, chunkSize, compression int) (*Table, error) {
return createTableFrom(g.id, name, dtype, chunkSize, compression)
}
// OpenTable opens an existing packet table.
func (g *Group) OpenTable(name string) (*Table, error) {
return openTable(g.id, name)
}