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|
package classic
import (
"io"
"fmt"
"bytes"
"bufio"
"encoding/binary"
)
type FByte int8
type FShort int16
type String [64]byte
type LevelData [1024]byte
type Packet interface {
PacketId() byte
}
const (
NonOpUser = 0x00
OpUser = 0x64
)
const (
NoCpe = 0x00
UseCpe = 0x42
)
type PlayerId struct {
Version byte
Username String
VerificationKey String
Ext byte
}
func (p *PlayerId) PacketId() byte {
return 0x00
}
type ServerId struct {
Version byte
ServerName String
Motd String
UserType byte
}
func (p *ServerId) PacketId() byte {
return 0x00
}
type Ping struct {}
func (p *Ping) PacketId() byte {
return 0x01
}
type LevelInit struct {}
func (p *LevelInit) PacketId() byte {
return 0x02
}
type LevelDataChunk struct {
Length int16
Data LevelData
PercentComplete byte
}
func (p *LevelDataChunk) PacketId() byte {
return 0x03
}
type LevelFinalize struct {
Width int16
Height int16
Length int16
}
func (p *LevelFinalize) PacketId() byte {
return 0x04
}
const (
BlockDestroyed = iota
BlockCreated
)
type ClientSetBlock struct {
X, Y, Z int16
Mode byte
Block byte
}
func (p *ClientSetBlock) PacketId() byte {
return 0x05
}
type SetBlock struct {
X, Y, Z int16
Block byte
}
func (p *SetBlock) PacketId() byte {
return 0x06
}
type SpawnPlayer struct {
PlayerId int8
Username String
X, Y, Z FShort
Yaw, Pitch byte
}
func (p *SpawnPlayer) PacketId() byte {
return 0x07
}
type SetPosFacing struct {
PlayerId int8
X, Y, Z FShort
Yaw, Pitch byte
}
func (p *SetPosFacing) PacketId() byte {
return 0x08
}
type UpdatePosFacing struct {
UpdatePos
UpdateFacing
}
func (p *UpdatePosFacing) PacketId() byte {
return 0x09
}
type UpdatePos struct {
DeltaX, DeltaY, DeltaZ FByte
}
func (p *UpdatePos) PacketId() byte {
return 0x0a
}
type UpdateFacing struct {
Yaw, Pitch byte
}
func (p *UpdateFacing) PacketId() byte {
return 0x0b
}
type DespawnPlayer struct {
PlayerId int8
}
func (p *DespawnPlayer) PacketId() byte {
return 0x0c
}
type Message struct {
PlayerId int8
Message String
}
func (p *Message) PacketId() byte {
return 0x0d
}
type DisconnectPlayer struct {
Reason String
}
func (p *DisconnectPlayer) PacketId() byte {
return 0x0e
}
type UpdateUserType struct {
Type byte
}
func (p *UpdateUserType) PacketId() byte {
return 0x0f
}
func createPacketType(packetId byte, client bool, ext map[string]bool) Packet {
switch packetId {
case 0x00:
if client {
return &ServerId {}
} else {
return &PlayerId {}
}
case 0x01: return &Ping {}
case 0x02: return &LevelInit {}
case 0x03: return &LevelDataChunk {}
case 0x04: return &LevelFinalize {}
case 0x05: return &ClientSetBlock {}
case 0x06: return &SetBlock {}
case 0x07: return &SpawnPlayer {}
case 0x08: return &SetPosFacing {}
case 0x09: return &UpdatePosFacing {}
case 0x0a: return &UpdatePos {}
case 0x0b: return &UpdateFacing {}
case 0x0c: return &DespawnPlayer {}
case 0x0d: return &Message {}
case 0x0e: return &DisconnectPlayer {}
case 0x0f: return &UpdateUserType {}
default: return nil
}
}
func readPacket(
rd io.Reader, client bool, ext map[string]bool) (Packet, error) {
var b [1]byte
_, err := io.ReadFull(rd, b[:])
if err != nil {
return nil, fmt.Errorf("Read packet: %w", err)
}
packetId := b[0]
packet := createPacketType(packetId, client, ext)
if packet == nil {
return nil, fmt.Errorf("Unknown packet type: 0x%02x", packetId)
}
err = binary.Read(rd, binary.BigEndian, packet)
if err != nil {
return nil, fmt.Errorf("Read packet: %w", err)
}
return packet, nil
}
func SReadPacket(rd io.Reader, ext map[string]bool) (Packet, error) {
return readPacket(rd, false, ext)
}
func CReadPacket(rd io.Reader, ext map[string]bool) (Packet, error) {
return readPacket(rd, true, ext)
}
func WritePacket(wr io.Writer, packet Packet) error {
bw := bufio.NewWriter(wr)
bw.WriteByte(packet.PacketId())
err := binary.Write(bw, binary.BigEndian, packet)
if err != nil {
return fmt.Errorf("Write packet: %w", err)
}
return bw.Flush()
}
func PadString(str string) String {
var pstr String
copy(pstr[:], []byte(str))
if len(str) < 64 {
copy(pstr[len(str):], bytes.Repeat([]byte(" "), 64 - len(str)))
}
return pstr
}
func UnpadString(pstr String) string {
return string(bytes.TrimRight(pstr[:], " "))
}
func (s String) String() string {
return UnpadString(s)
}
|
