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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.
package cbor_test
import (
"encoding/json"
"fmt"
"io"
"reflect"
"github.com/fxamacker/cbor/v2"
)
type TranscoderFunc func(io.Writer, io.Reader) error
func (f TranscoderFunc) Transcode(w io.Writer, r io.Reader) error {
return f(w, r)
}
func ExampleTranscoder_fromJSON() {
enc, _ := cbor.EncOptions{
JSONMarshalerTranscoder: TranscoderFunc(func(w io.Writer, r io.Reader) error {
d := json.NewDecoder(r)
for {
token, err := d.Token()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
switch token {
case json.Delim('['):
if _, err := w.Write([]byte{0x9f}); err != nil {
return err
}
case json.Delim('{'):
if _, err := w.Write([]byte{0xbf}); err != nil {
return err
}
case json.Delim(']'), json.Delim('}'):
if _, err := w.Write([]byte{0xff}); err != nil {
return err
}
default:
b, err := cbor.Marshal(token)
if err != nil {
return err
}
if _, err := w.Write(b); err != nil {
return err
}
}
}
}),
}.EncMode()
got, _ := enc.Marshal(json.RawMessage(`{"a": [true, "z", {"y": 3.14}], "b": {"c": null}}`))
diag, _ := cbor.Diagnose(got)
fmt.Println(diag)
// Output: {_ "a": [_ true, "z", {_ "y": 3.14}], "b": {_ "c": null}}
}
func ExampleTranscoder_toJSON() {
var dec cbor.DecMode
dec, _ = cbor.DecOptions{
DefaultMapType: reflect.TypeOf(map[string]any{}),
JSONUnmarshalerTranscoder: TranscoderFunc(func(w io.Writer, r io.Reader) error {
var tmp any
if err := dec.NewDecoder(r).Decode(&tmp); err != nil {
return err
}
return json.NewEncoder(w).Encode(tmp)
}),
}.DecMode()
var got json.RawMessage
if err := dec.Unmarshal(cbor.RawMessage{0xa2, 0x61, 'a', 0x01, 0x61, 'b', 0x83, 0xf4, 0xf5, 0xf6}, &got); err != nil {
panic(err)
}
fmt.Println(string(got))
// Output: {"a":1,"b":[false,true,null]}
}
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