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can now respond to packets

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This commit is contained in:
CPunch
2023-03-05 02:14:36 -06:00
parent 34ce9a7420
commit 115005b6a3
6 changed files with 219 additions and 94 deletions
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54
protocol/packet.go
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@@ -23,8 +23,12 @@ type Packet struct {
const PACK_ALIGN = 4
func NewPacket(sz int) *Packet {
newBuf := make([]byte, sz)
return &Packet{ByteOrder: binary.LittleEndian, Buf: newBuf}
pkt := &Packet{
ByteOrder: binary.LittleEndian,
Buf: make([]byte, sz),
cursor: 0,
}
return pkt
}
func (pkt *Packet) ResetCursor() {
@@ -44,6 +48,10 @@ func (pkt *Packet) writeRaw(data []byte) {
func (pkt *Packet) Write(data []byte) {
pkt.writeRaw(data)
if len(pkt.Buf) > CN_PACKET_BUFFER_SIZE {
panic(fmt.Errorf("Failed to write to packet, invalid size!"))
}
}
func (pkt *Packet) writeByte(data byte) {
@@ -59,7 +67,7 @@ func (pkt *Packet) readRaw(sz int) []byte {
func (pkt *Packet) Read(sz int) []byte {
if sz > len(pkt.Buf) {
panic("Failed to read from packet, invalid size!")
panic(fmt.Errorf("Failed to read from packet, invalid size!"))
}
return pkt.readRaw(sz)
@@ -70,6 +78,8 @@ func (pkt *Packet) readByte() byte {
}
func (pkt *Packet) encodeStructField(field reflect.StructField, value reflect.Value) {
log.Printf("Encoding '%s', current cursor: %d", field.Name, len(pkt.Buf))
switch field.Type.Kind() {
case reflect.String: // all strings in fusionfall packets are encoded as utf16, we'll need to encode it
sz, err := strconv.Atoi(field.Tag.Get("size"))
@@ -77,24 +87,34 @@ func (pkt *Packet) encodeStructField(field reflect.StructField, value reflect.Va
panic(fmt.Errorf("Failed to grab string 'size' tag!!"))
}
sz *= 2
buf16 := utf16.Encode([]rune(value.String()))
buf := *(*[]byte)(unsafe.Pointer(&buf16))
// len(buf16) needs to be the same size as sz
if len(buf16) > sz {
// len(buf) needs to be the same size as sz
if len(buf) > sz {
// truncate
buf16 = buf16[:sz]
buf = buf[:sz]
} else {
// grow
for len(buf16) < sz {
buf16 = append(buf16, 0)
for len(buf) < sz {
buf = append(buf, 0)
}
}
buf := *(*[]byte)(unsafe.Pointer(&buf16))
log.Printf("sending %d", len(buf))
pkt.Write(buf)
default:
pkt.Encode(value.Addr().Interface())
}
// write padding bytes
pad, err := strconv.Atoi(field.Tag.Get("pad"))
if err == nil {
for i := 0; i < pad; i++ {
pkt.writeByte(0)
}
}
}
func (pkt *Packet) Encode(data interface{}) {
@@ -150,14 +170,6 @@ func (pkt *Packet) Encode(data interface{}) {
func (pkt *Packet) decodeStructField(field reflect.StructField, value reflect.Value) {
log.Printf("Decoding '%s', current cursor: %d", field.Name, pkt.cursor)
// read padding bytes
offset, err := strconv.Atoi(field.Tag.Get("offset"))
if err == nil {
for pkt.cursor < offset {
pkt.readByte()
}
}
switch field.Type.Kind() {
case reflect.String: // all strings in fusionfall packets are encoded as utf16, we'll need to decode it
sz, err := strconv.Atoi(field.Tag.Get("size"))
@@ -186,6 +198,14 @@ func (pkt *Packet) decodeStructField(field reflect.StructField, value reflect.Va
default:
pkt.Decode(value.Addr().Interface())
}
// read padding bytes
pad, err := strconv.Atoi(field.Tag.Get("pad"))
if err == nil {
for i := 0; i < pad; i++ {
pkt.readByte()
}
}
}
func (pkt *Packet) Decode(data interface{}) {