/
encoder.go
99 lines (84 loc) · 2.25 KB
/
encoder.go
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// Copyright 2020 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rdict
import (
"fmt"
"reflect"
"go-hep.org/x/hep/groot/rbytes"
)
type encoder struct {
w *rbytes.WBuffer
si *StreamerInfo
kind rbytes.StreamKind
wops []wstreamer
}
func newEncoder(w *rbytes.WBuffer, si *StreamerInfo, kind rbytes.StreamKind, ops []wstreamer) (*encoder, error) {
return &encoder{w, si, kind, ops}, nil
}
func (enc *encoder) EncodeROOT(ptr interface{}) error {
rv := reflect.ValueOf(ptr)
if rv.Kind() != reflect.Ptr {
return fmt.Errorf("rdict: invalid kind (got=%T, want=pointer)", ptr)
}
var (
typename = enc.si.Name()
typevers = int16(enc.si.ClassVersion())
pos = enc.w.WriteVersion(typevers)
err error
)
for i, op := range enc.wops {
_, err = op.wstream(enc.w, ptr)
if err != nil {
return fmt.Errorf("rdict: could not write element %d from %q: %w", i, typename, err)
}
}
_, err = enc.w.SetByteCount(pos, typename)
if err != nil {
return fmt.Errorf("rdict: could not set byte count for %q: %w", typename, err)
}
return nil
}
var (
_ rbytes.Encoder = (*encoder)(nil)
)
type wstreamerInfo struct {
recv interface{}
wops []wstreamer
kind rbytes.StreamKind
si *StreamerInfo
}
func newWStreamerInfo(si *StreamerInfo, kind rbytes.StreamKind, wops []wstreamer) (*wstreamerInfo, error) {
return &wstreamerInfo{
recv: nil,
wops: wops,
kind: kind,
si: si,
}, nil
}
func (ww *wstreamerInfo) Bind(recv interface{}) error {
rv := reflect.ValueOf(recv)
if rv.Kind() != reflect.Ptr {
return fmt.Errorf("rdict: invalid kind (got=%T, want=pointer)", recv)
}
ww.recv = recv
if len(ww.wops) == 1 && ww.wops[0].cfg.descr.elem.Name() == "This" {
// binding directly to 'recv'. assume no offset is to be applied
ww.wops[0].cfg.offset = -1
}
return nil
}
func (ww *wstreamerInfo) WStreamROOT(w *rbytes.WBuffer) error {
for i, op := range ww.wops {
_, err := op.wstream(w, ww.recv)
if err != nil {
typename := ww.si.Name()
return fmt.Errorf("rdict: could not write element %d from %q: %w", i, typename, err)
}
}
return nil
}
var (
_ rbytes.WStreamer = (*wstreamerInfo)(nil)
_ rbytes.Binder = (*wstreamerInfo)(nil)
)