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// Copyright (c) 2020 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package codec
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"math"
"reflect"
"unsafe"
"github.com/lunixbochs/struc"
"git.fd.io/govpp.git/api"
)
var DefaultCodec = &NewCodec{} // &MsgCodec{}
// Marshaler is the interface implemented by the binary API messages that can
// marshal itself into binary form for the wire.
type Marshaler interface {
Size() int
Marshal([]byte) ([]byte, error)
}
// Unmarshaler is the interface implemented by the binary API messages that can
// unmarshal a binary representation of itself from the wire.
type Unmarshaler interface {
Unmarshal([]byte) error
}
type NewCodec struct{}
func (*NewCodec) EncodeMsg(msg api.Message, msgID uint16) (data []byte, err error) {
if msg == nil {
return nil, errors.New("nil message passed in")
}
marshaller, ok := msg.(Marshaler)
if !ok {
return nil, fmt.Errorf("message %s does not implement marshaller", msg.GetMessageName())
}
size := marshaller.Size()
offset := getOffset(msg)
//fmt.Printf("size=%d offset=%d\n", size, offset)
b := make([]byte, size+offset)
b[0] = byte(msgID >> 8)
b[1] = byte(msgID)
//fmt.Printf("len(b)=%d cap(b)=%d\n", len(b), cap(b))
//b = append(b, byte(msgID>>8), byte(msgID))
//buf := new(bytes.Buffer)
//buf.Grow(size)
// encode msg ID
//buf.WriteByte(byte(msgID >> 8))
//buf.WriteByte(byte(msgID))
data, err = marshaller.Marshal(b[offset:])
if err != nil {
return nil, err
}
//buf.Write(b)
return b[0:len(b):len(b)], nil
}
func getOffset(msg api.Message) (offset int) {
switch msg.GetMessageType() {
case api.RequestMessage:
return 10
case api.ReplyMessage:
return 6
case api.EventMessage:
return 6
}
return 2
}
func (*NewCodec) DecodeMsg(data []byte, msg api.Message) (err error) {
if msg == nil {
return errors.New("nil message passed in")
}
marshaller, ok := msg.(Unmarshaler)
if !ok {
return fmt.Errorf("message %s does not implement marshaller", msg.GetMessageName())
}
offset := getOffset(msg)
err = marshaller.Unmarshal(data[offset:len(data)])
if err != nil {
return err
}
return nil
}
func (*NewCodec) DecodeMsgContext(data []byte, msg api.Message) (context uint32, err error) {
if msg == nil {
return 0, errors.New("nil message passed in")
}
switch msg.GetMessageType() {
case api.RequestMessage:
return order.Uint32(data[6:10]), nil
case api.ReplyMessage:
return order.Uint32(data[2:6]), nil
}
return 0, nil
}
type OldCodec struct{}
func (c *OldCodec) Marshal(v interface{}) (b []byte, err error) {
buf := new(bytes.Buffer)
if err := struc.Pack(buf, v); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (c *OldCodec) Unmarshal(data []byte, v interface{}) error {
buf := bytes.NewReader(data)
if err := struc.Unpack(buf, v); err != nil {
return err
}
return nil
}
/*type CodecNew struct{}
func (c *CodecNew) Marshal(v interface{}) (b []byte, err error) {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.BigEndian, v); err != nil {
return nil, err
}
return buf.Bytes(), nil
}*/
func EncodeBool(b bool) byte {
if b {
return 1
}
return 0
}
func MarshalValue(value interface{}) []byte {
switch value.(type) {
case int8:
return []byte{byte(value.(int8))}
case uint8:
return []byte{byte(value.(uint8))}
}
return nil
}
var order = binary.BigEndian
type Buffer struct {
pos int
buf []byte
}
func (b *Buffer) Bytes() []byte {
return b.buf[:b.pos]
}
func (b *Buffer) EncodeUint8(v uint8) {
b.buf[b.pos] = v
b.pos += 1
}
func (b *Buffer) EncodeUint16(v uint16) {
order.PutUint16(b.buf[b.pos:b.pos+2], v)
b.pos += 2
}
func (b *Buffer) EncodeUint32(v uint32) {
order.PutUint32(b.buf[b.pos:b.pos+4], v)
b.pos += 4
}
func (b *Buffer) EncodeUint64(v uint64) {
order.PutUint64(b.buf[b.pos:b.pos+8], v)
b.pos += 8
}
func (b *Buffer) EncodeFloat64(v float64) {
order.PutUint64(b.buf[b.pos:b.pos+8], math.Float64bits(v))
b.pos += 8
}
func (b *Buffer) EncodeBool(v bool) {
if v {
b.buf[b.pos] = 1
} else {
b.buf[b.pos] = 0
}
b.pos += 1
}
func (b *Buffer) EncodeString(v string) {
b.pos += 1
}
func DecodeString(b []byte) string {
sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&b))
stringHeader := reflect.StringHeader{Data: sliceHeader.Data, Len: sliceHeader.Len}
return *(*string)(unsafe.Pointer(&stringHeader))
}
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