94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
// Copyright 2018 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package json
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import (
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"encoding/binary"
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"errors"
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"io"
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)
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var (
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ErrMsgType = errors.New("message type error")
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ErrMaxMsgLength = errors.New("message length exceed the limit")
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ErrMsgLength = errors.New("message length error")
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ErrMsgFormat = errors.New("message format error")
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)
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func (msgCtl *MsgCtl) readMsg(c io.Reader) (typeByte byte, buffer []byte, err error) {
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buffer = make([]byte, 1)
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_, err = c.Read(buffer)
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if err != nil {
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return
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}
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typeByte = buffer[0]
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if _, ok := msgCtl.typeMap[typeByte]; !ok {
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err = ErrMsgType
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return
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}
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var length int64
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err = binary.Read(c, binary.BigEndian, &length)
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if err != nil {
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return
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}
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if length > msgCtl.maxMsgLength {
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err = ErrMaxMsgLength
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return
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} else if length < 0 {
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err = ErrMsgLength
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return
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}
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buffer = make([]byte, length)
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n, err := io.ReadFull(c, buffer)
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if err != nil {
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return
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}
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if int64(n) != length {
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err = ErrMsgFormat
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}
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return
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}
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func (msgCtl *MsgCtl) ReadMsg(c io.Reader) (msg Message, err error) {
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typeByte, buffer, err := msgCtl.readMsg(c)
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if err != nil {
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return
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}
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return msgCtl.UnPack(typeByte, buffer)
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}
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func (msgCtl *MsgCtl) ReadMsgInto(c io.Reader, msg Message) (err error) {
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_, buffer, err := msgCtl.readMsg(c)
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if err != nil {
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return
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}
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return msgCtl.UnPackInto(buffer, msg)
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}
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func (msgCtl *MsgCtl) WriteMsg(c io.Writer, msg interface{}) (err error) {
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buffer, err := msgCtl.Pack(msg)
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if err != nil {
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return
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}
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if _, err = c.Write(buffer); err != nil {
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return
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}
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return nil
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}
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