Esempio n. 1
1
File: get.go Progetto: postfix/hdf5
// Get reads data from the file.
func (f *File) Get(name string, something interface{}) error {
	value := reflect.ValueOf(something)
	if value.Kind() != reflect.Ptr {
		return errors.New("expected a pointer")
	}

	value = reflect.Indirect(value)

	cname := C.CString(name)
	defer C.free(unsafe.Pointer(cname))

	did := C.H5Dopen2(f.fid, cname, C.H5P_DEFAULT)
	if did < 0 {
		return errors.New("cannot find the dataset")
	}
	defer C.H5Dclose(did)

	object := newObject()
	defer object.free()

	object.tid = C.H5Dget_type(did)
	if object.tid < 0 {
		return errors.New("cannot get the datatype of the dataset")
	}

	if err := initializeToGet(object, value); err != nil {
		return err
	}

	if C.H5Dread(did, object.tid, C.H5S_ALL, C.H5S_ALL, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot read the dataset from the file")
	}

	if err := finalizeToGet(object, value); err != nil {
		return err
	}

	one := C.hsize_t(1)
	sid := C.H5Screate_simple(1, (*C.hsize_t)(unsafe.Pointer(&one)), nil)
	if sid < 0 {
		return errors.New("cannot create a data space")
	}
	defer C.H5Sclose(sid)

	if C.H5Dvlen_reclaim(object.tid, sid, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot reclaim memory")
	}

	return nil
}
Esempio n. 2
0
// Creates a new simple dataspace and opens it for access.
// hid_t H5Screate_simple( int rank, const hsize_t * current_dims, const hsize_t * maximum_dims )
func CreateSimpleDataSpace(dims, maximum_dims []int) (*DataSpace, error) {

	var c_dims *C.hsize_t = nil
	var c_maxdims *C.hsize_t = nil

	rank := C.int(0)
	if dims != nil {
		rank = C.int(len(dims))
		// FIXME: size of C.hsize_t and go.int !!
		c_dims = (*C.hsize_t)(unsafe.Pointer(&dims[0]))

	}
	if maximum_dims != nil {
		rank = C.int(len(maximum_dims))
		// FIXME: size of C.hsize_t and go.int !!
		c_maxdims = (*C.hsize_t)(unsafe.Pointer(&maximum_dims[0]))

	}
	if len(dims) != len(maximum_dims) && (dims != nil && maximum_dims != nil) {
		return nil, errors.New("sizes of 'dims' and 'maximum_dims' dont match")
	}

	hid := C.H5Screate_simple(rank, c_dims, c_maxdims)
	err := togo_err(C.herr_t(int(hid)))
	if err != nil {
		return nil, err
	}
	ds := new_dataspace(hid)
	return ds, err
}
Esempio n. 3
0
// CreateSimpleDataspace creates a new simple dataspace and opens it for access.
func CreateSimpleDataspace(dims, maxDims []uint) (*Dataspace, error) {
	var c_dims, c_maxdims *C.hsize_t

	rank := C.int(0)
	if dims != nil {
		rank = C.int(len(dims))
		c_dims = (*C.hsize_t)(unsafe.Pointer(&dims[0]))

	}
	if maxDims != nil {
		rank = C.int(len(maxDims))
		c_maxdims = (*C.hsize_t)(unsafe.Pointer(&maxDims[0]))

	}
	if len(dims) != len(maxDims) && (dims != nil && maxDims != nil) {
		return nil, errors.New("lengths of dims and maxDims do not match")
	}

	hid := C.H5Screate_simple(rank, c_dims, c_maxdims)
	if hid < 0 {
		return nil, fmt.Errorf("failed to create dataspace")
	}
	return newDataspace(hid), nil
}
Esempio n. 4
0
File: put.go Progetto: postfix/hdf5
// Put writes data into the file.
func (f *File) Put(name string, something interface{}, dimensions ...uint) error {
	object := newObject()
	defer object.free()

	if err := initializeToPut(object, reflect.ValueOf(something), dimensions...); err != nil {
		return err
	}

	cname := C.CString(name)
	defer C.free(unsafe.Pointer(cname))

	one := C.hsize_t(1)
	sid := C.H5Screate_simple(1, (*C.hsize_t)(unsafe.Pointer(&one)), nil)
	if sid < 0 {
		return errors.New("cannot create a data space")
	}
	defer C.H5Sclose(sid)

	if result := C.H5Lexists(f.fid, cname, C.H5P_DEFAULT); result < 0 {
		return errors.New("cannot check if the name already exists")
	} else if result > 0 && C.H5Ldelete(f.fid, cname, C.H5P_DEFAULT) < 0 {
		return errors.New("cannot overwrite an existing dataset")
	}

	did := C.H5Dcreate2(f.fid, cname, object.tid, sid, C.H5P_DEFAULT, C.H5P_DEFAULT, C.H5P_DEFAULT)
	if did < 0 {
		return errors.New("cannot create a dataset")
	}
	defer C.H5Dclose(did)

	if C.H5Dwrite(did, object.tid, C.H5S_ALL, C.H5S_ALL, C.H5P_DEFAULT, object.data) < 0 {
		return errors.New("cannot write the dataset into the file")
	}

	return nil
}