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packet: refactoring; use go's binary package for encoding *most* things
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commit
5cc3f275c1
@ -3,10 +3,11 @@ package protocol
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import (
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"encoding/binary"
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"fmt"
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"io"
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"log"
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"reflect"
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"strconv"
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"unicode/utf16"
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"unsafe"
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)
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/*
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@ -17,60 +18,61 @@ import (
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type Packet struct {
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ByteOrder binary.ByteOrder
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Buf []byte
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cursor int // to keep track of things like member alignment for easier debugging
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}
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func NewPacket(buf []byte) *Packet {
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pkt := &Packet{
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ByteOrder: binary.LittleEndian,
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Buf: buf,
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cursor: 0,
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}
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return pkt
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}
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func (pkt *Packet) ResetCursor() {
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pkt.cursor = 0
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}
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func (pkt *Packet) writeRaw(data []byte) {
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pkt.Buf = append(pkt.Buf, data...)
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pkt.cursor += len(data)
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}
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func (pkt *Packet) Write(data []byte) {
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func (pkt *Packet) Write(data []byte) (int, error) {
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pkt.writeRaw(data)
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if len(pkt.Buf) > CN_PACKET_BUFFER_SIZE {
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panic(fmt.Errorf("Failed to write to packet, invalid size!"))
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return 0, fmt.Errorf("Failed to write to packet, invalid size!")
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}
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return len(data), nil
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}
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func (pkt *Packet) writeByte(data byte) {
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pkt.Write([]byte{data})
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}
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func (pkt *Packet) readRaw(sz int) []byte {
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data := pkt.Buf[:sz]
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func (pkt *Packet) readRaw(data []byte) (int, error) {
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sz := copy(data, pkt.Buf)
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pkt.Buf = pkt.Buf[sz:]
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pkt.cursor += sz
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return data
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}
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func (pkt *Packet) Read(sz int) []byte {
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if sz > len(pkt.Buf) {
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panic(fmt.Errorf("Failed to read from packet, invalid size!"))
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if sz != len(data) {
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return sz, io.EOF
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}
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return pkt.readRaw(sz)
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return sz, nil
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}
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func (pkt *Packet) Read(data []byte) (int, error) {
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if len(data) > len(pkt.Buf) {
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return 0, fmt.Errorf("Failed to read from packet, invalid size!")
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}
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return pkt.readRaw(data)
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}
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func (pkt *Packet) readByte() byte {
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return pkt.Read(1)[0]
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data := pkt.Buf[0]
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pkt.Buf = pkt.Buf[1:]
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return data
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}
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func (pkt *Packet) encodeStructField(field reflect.StructField, value reflect.Value) {
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// log.Printf("Encoding '%s', current cursor: %d", field.Name, len(pkt.Buf))
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log.Printf("Encoding '%s'", field.Name)
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switch field.Type.Kind() {
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case reflect.String: // all strings in fusionfall packets are encoded as utf16, we'll need to encode it
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@ -79,22 +81,21 @@ func (pkt *Packet) encodeStructField(field reflect.StructField, value reflect.Va
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panic(fmt.Errorf("Failed to grab string 'size' tag!!"))
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}
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sz *= 2
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buf16 := utf16.Encode([]rune(value.String()))
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buf := *(*[]byte)(unsafe.Pointer(&buf16))
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// len(buf) needs to be the same size as sz
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if len(buf) > sz {
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// len(buf16) needs to be the same size as sz
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if len(buf16) > sz {
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// truncate
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buf = buf[:sz]
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buf16 = buf16[:sz]
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} else {
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// grow
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for len(buf) < sz {
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buf = append(buf, 0)
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for len(buf16) < sz {
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buf16 = append(buf16, 0)
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}
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}
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pkt.Write(buf)
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// write
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binary.Write(pkt, pkt.ByteOrder, buf16)
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default:
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pkt.Encode(value.Addr().Interface())
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}
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@ -118,48 +119,14 @@ func (pkt *Packet) Encode(data interface{}) {
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for i := 0; i < sz; i++ {
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pkt.encodeStructField(rv.Type().Field(i), rv.Field(i))
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}
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case reflect.Array:
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sz := rv.Len()
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// encode data
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for i := 0; i < sz; i++ {
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elem := rv.Index(i)
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pkt.Encode(elem.Addr().Interface())
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}
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case reflect.Uint8:
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pkt.writeByte(byte(rv.Uint()))
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case reflect.Uint16:
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tmp := make([]byte, 2)
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pkt.ByteOrder.PutUint16(tmp, uint16(rv.Uint()))
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pkt.Write(tmp)
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case reflect.Uint32:
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tmp := make([]byte, 4)
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pkt.ByteOrder.PutUint32(tmp, uint32(rv.Uint()))
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pkt.Write(tmp)
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case reflect.Uint64:
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tmp := make([]byte, 8)
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pkt.ByteOrder.PutUint64(tmp, uint64(rv.Uint()))
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pkt.Write(tmp)
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// im using the PutUintX() api here because it's functionally the same and apparently PutIntX doesn't exist?
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case reflect.Int8:
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pkt.writeByte(byte(rv.Int()))
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case reflect.Int16:
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tmp := make([]byte, 2)
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pkt.ByteOrder.PutUint16(tmp, uint16(rv.Int()))
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pkt.Write(tmp)
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case reflect.Int32:
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tmp := make([]byte, 4)
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pkt.ByteOrder.PutUint32(tmp, uint32(rv.Int()))
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pkt.Write(tmp)
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case reflect.Int64:
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tmp := make([]byte, 8)
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pkt.ByteOrder.PutUint64(tmp, uint64(rv.Int()))
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pkt.Write(tmp)
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default:
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// we pass everything else to go's binary package
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binary.Write(pkt, pkt.ByteOrder, data)
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}
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}
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func (pkt *Packet) decodeStructField(field reflect.StructField, value reflect.Value) {
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// log.Printf("Decoding '%s', current cursor: %d", field.Name, pkt.cursor)
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log.Printf("Decoding '%s'", field.Name)
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switch field.Type.Kind() {
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case reflect.String: // all strings in fusionfall packets are encoded as utf16, we'll need to decode it
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@ -168,12 +135,8 @@ func (pkt *Packet) decodeStructField(field reflect.StructField, value reflect.Va
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panic(fmt.Errorf("Failed to grab string 'size' tag!!"))
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}
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// sz * sizeof(char16_t)
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sz *= 2
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buf := make([]byte, 0, sz)
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buf = append(buf, pkt.Read(sz)...)
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buf16 := *(*[]uint16)(unsafe.Pointer(&buf))
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buf16 := make([]uint16, sz)
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binary.Read(pkt, pkt.ByteOrder, buf16)
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// find null terminator
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var realSize int
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@ -183,8 +146,7 @@ func (pkt *Packet) decodeStructField(field reflect.StructField, value reflect.Va
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}
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}
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str := string(utf16.Decode(buf16[:realSize]))
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value.SetString(str)
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value.SetString(string(utf16.Decode(buf16[:realSize])))
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default:
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pkt.Decode(value.Addr().Interface())
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}
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@ -208,29 +170,7 @@ func (pkt *Packet) Decode(data interface{}) {
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for i := 0; i < sz; i++ {
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pkt.decodeStructField(rv.Type().Field(i), rv.Field(i))
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}
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case reflect.Array:
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sz := rv.Len()
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// decode data
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for i := 0; i < sz; i++ {
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elem := rv.Index(i)
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pkt.Decode(elem.Addr().Interface())
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}
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case reflect.Uint8:
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rv.SetUint(uint64(pkt.readByte()))
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case reflect.Uint16:
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rv.SetUint(uint64(pkt.ByteOrder.Uint16(pkt.Read(2))))
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case reflect.Uint32:
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rv.SetUint(uint64(pkt.ByteOrder.Uint32(pkt.Read(4))))
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case reflect.Uint64:
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rv.SetUint(pkt.ByteOrder.Uint64(pkt.Read(8)))
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case reflect.Int8:
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rv.SetInt(int64(pkt.readByte()))
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case reflect.Int16:
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rv.SetInt(int64(pkt.ByteOrder.Uint16(pkt.Read(2))))
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case reflect.Int32:
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rv.SetInt(int64(pkt.ByteOrder.Uint32(pkt.Read(4))))
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case reflect.Int64:
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rv.SetInt(int64(pkt.ByteOrder.Uint64(pkt.Read(8))))
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default:
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binary.Read(pkt, pkt.ByteOrder, data)
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}
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}
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@ -35,6 +35,7 @@ func (server *LoginServer) AcceptLogin(peer *Peer, SzID string, IClientVerC int3
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UiSvrTime: uint64(time.Now().Unix()),
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}
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// swap keys
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peer.Send(resp, protocol.P_LS2CL_REP_LOGIN_SUCC)
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peer.E_key = protocol.CreateNewKey(
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resp.UiSvrTime,
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