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pomelo_packet_encoder.go
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pomelo_packet_encoder.go
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// Copyright (c) nano Author and TFG Co. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package codec
import (
"github.com/topfreegames/pitaya/conn/packet"
)
// PomeloPacketEncoder struct
type PomeloPacketEncoder struct {
}
// NewPomeloPacketEncoder ctor
func NewPomeloPacketEncoder() *PomeloPacketEncoder {
return &PomeloPacketEncoder{}
}
// Encode create a packet.Packet from the raw bytes slice and then encode to network bytes slice
// Protocol refs: https://github.com/NetEase/pomelo/wiki/Communication-Protocol
//
// -<type>-|--------<length>--------|-<data>-
// --------|------------------------|--------
// 1 byte packet type, 3 bytes packet data length(big end), and data segment
func (e *PomeloPacketEncoder) Encode(typ packet.Type, data []byte) ([]byte, error) {
if typ < packet.Handshake || typ > packet.Kick {
return nil, packet.ErrWrongPomeloPacketType
}
p := &packet.Packet{Type: typ, Length: len(data)}
buf := make([]byte, p.Length+HeadLength)
buf[0] = byte(p.Type)
copy(buf[1:HeadLength], intToBytes(p.Length))
copy(buf[HeadLength:], data)
return buf, nil
}
// Encode packet data length to bytes(Big end)
func intToBytes(n int) []byte {
buf := make([]byte, 3)
buf[0] = byte((n >> 16) & 0xFF)
buf[1] = byte((n >> 8) & 0xFF)
buf[2] = byte(n & 0xFF)
return buf
}