update Decode function signatures to use io.ReadSeeker instead of io.Reader

proto/connection.go

@@ -51,7 +51,7 @@ func (u *UnCodablePacket) Encode(w io.Writer) (err error) {
 	return
 }
 
-func (u *UnCodablePacket) Decode(r io.Reader) (err error) {
+func (u *UnCodablePacket) Decode(r io.ReadSeeker) (err error) {
 	err = errors.New("how did you even get here")
 	return
 }
@@ -234,7 +234,7 @@ func (c *Conn) Receive() (packet proto_base.EncodeDecodeAble, err error) {
 	if err != nil {
 		return
 	}
-	b := bytes.NewBuffer(packetBytes)
+	b := bytes.NewReader(packetBytes)
 	id, err := proto_base.DecodeVarInt(b)
 	if err != nil {
 		return

proto_base/base_types.go

@@ -236,7 +236,7 @@ func ErroringIndex[K comparable, V any, M map[K]V](m M, i K) (v V, err error) {
 
 type EncodeDecodeAble interface {
 	Encode(w io.Writer) (err error)
-	Decode(r io.Reader) (err error)
+	Decode(r io.ReadSeeker) (err error)
 }
 
 type Void struct{}
@@ -244,7 +244,7 @@ type Void struct{}
 func (v Void) Encode(w io.Writer) (err error) {
 	return
 }
-func (v Void) Decode(r io.Reader) (err error) {
+func (v Void) Decode(r io.ReadSeeker) (err error) {
 	return
 }
 

proto_generator/main.go

@@ -219,7 +219,7 @@ func (g *Generator) GenerateTypes(prefix string, types Types) (err error) {
 		e, retExpr := FixPointerReceivers(e)
 		AppendDecl(g.File, TypeDecl(tName, e))
 
-		args := []NameAndType{{"r", Ident("io.Reader")}}
+		args := []NameAndType{{"r", Ident("io.ReadSeeker")}}
 		rets := []NameAndType{{"err", Ident("error")}}
 		decodeFunction := NewFuncWithReceiver("Decode", "ret", Pointer(Ident(tName)), args, rets)
 		g.Depth = 0