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encode_map_go117.go
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encode_map_go117.go
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// Copyright (c) Faye Amacker. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.
//go:build !go1.20
package cbor
import (
"bytes"
"reflect"
)
type mapKeyValueEncodeFunc struct {
kf, ef encodeFunc
}
func (me *mapKeyValueEncodeFunc) encodeKeyValues(e *bytes.Buffer, em *encMode, v reflect.Value, kvs []keyValue) error {
if kvs == nil {
for i, iter := 0, v.MapRange(); iter.Next(); i++ {
if err := me.kf(e, em, iter.Key()); err != nil {
return err
}
if err := me.ef(e, em, iter.Value()); err != nil {
return err
}
}
return nil
}
initial := e.Len()
for i, iter := 0, v.MapRange(); iter.Next(); i++ {
offset := e.Len()
if err := me.kf(e, em, iter.Key()); err != nil {
return err
}
valueOffset := e.Len()
if err := me.ef(e, em, iter.Value()); err != nil {
return err
}
kvs[i] = keyValue{
offset: offset - initial,
valueOffset: valueOffset - initial,
nextOffset: e.Len() - initial,
}
}
return nil
}
func getEncodeMapFunc(t reflect.Type) encodeFunc {
kf, _ := getEncodeFunc(t.Key())
ef, _ := getEncodeFunc(t.Elem())
if kf == nil || ef == nil {
return nil
}
mkv := &mapKeyValueEncodeFunc{kf: kf, ef: ef}
return mapEncodeFunc{
e: mkv.encodeKeyValues,
}.encode
}