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utils.go
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/
utils.go
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package utils
import (
"bytes"
"encoding/binary"
"encoding/hex"
)
const (
S2CPacketSize = 1052
C2SPacketSize = 40
)
type S2CProtocol struct {
FID [20]byte
FileIdx int16
reserved [2]byte
PktIdx int16
PayloadSize int16
Payload [1024]byte
}
type C2SProtocol struct {
FID [20]byte
FileIdx int16
reserved [2]byte
PktIdx [8]int16
}
func S2CMarshal(fid string, FileIdx int16, PktIdx int16, payloadSize int16, payload []byte) []byte {
bytesBuffer := bytes.NewBuffer([]byte{})
reserved := [2]byte{}
FID, _ := hex.DecodeString(fid)
binary.Write(bytesBuffer, binary.BigEndian, &FID)
binary.Write(bytesBuffer, binary.BigEndian, &FileIdx)
binary.Write(bytesBuffer, binary.BigEndian, &reserved)
binary.Write(bytesBuffer, binary.BigEndian, &PktIdx)
binary.Write(bytesBuffer, binary.BigEndian, &payloadSize)
binary.Write(bytesBuffer, binary.BigEndian, &payload)
return bytesBuffer.Bytes()
}
func C2SMarshal(fid string, FileIdx int16, PktIdx []int16) []byte {
bytesBuffer := bytes.NewBuffer([]byte{})
reserved := [2]byte{}
FID, _ := hex.DecodeString(fid)
binary.Write(bytesBuffer, binary.BigEndian, &FID)
binary.Write(bytesBuffer, binary.BigEndian, &FileIdx)
binary.Write(bytesBuffer, binary.BigEndian, &reserved)
for i := 0; i < 8; i++ {
binary.Write(bytesBuffer, binary.BigEndian, &PktIdx[i])
}
return bytesBuffer.Bytes()
}
func S2CUnmarshal(S2CPkt []byte) (content S2CProtocol) {
bytesBuffer := bytes.NewBuffer(S2CPkt)
binary.Read(bytesBuffer, binary.BigEndian, &content.FID)
binary.Read(bytesBuffer, binary.BigEndian, &content.FileIdx)
binary.Read(bytesBuffer, binary.BigEndian, &content.reserved)
binary.Read(bytesBuffer, binary.BigEndian, &content.PktIdx)
binary.Read(bytesBuffer, binary.BigEndian, &content.PayloadSize)
binary.Read(bytesBuffer, binary.BigEndian, &content.Payload)
return
}
func C2SUnmarshal(C2SPkt []byte) (content C2SProtocol) {
bytesBuffer := bytes.NewBuffer(C2SPkt)
binary.Read(bytesBuffer, binary.BigEndian, &content.FID)
binary.Read(bytesBuffer, binary.BigEndian, &content.FileIdx)
binary.Read(bytesBuffer, binary.BigEndian, &content.reserved)
for i := 0; i < 8; i++ {
binary.Read(bytesBuffer, binary.BigEndian, &content.PktIdx[i])
}
return
}