1 files changed, 79 insertions, 0 deletions
diff --git a/packet/command/move/move.go b/packet/command/move/move.go
new file mode 100644
index 0000000..d52bb27
--- /dev/null
+++ b/packet/command/move/move.go
@@ -0,0 +1,79 @@
+package move
+
+import (
+	"slices"
+
+	"github.com/osm/quake/common/buffer"
+	"github.com/osm/quake/common/context"
+	"github.com/osm/quake/common/crc"
+	"github.com/osm/quake/packet/command/deltausercommand"
+	"github.com/osm/quake/protocol"
+)
+
+type Command struct {
+	Checksum byte
+	Lossage  byte
+	Null     *deltausercommand.Command
+	Old      *deltausercommand.Command
+	New      *deltausercommand.Command
+}
+
+func (cmd *Command) Bytes() []byte {
+	buf := buffer.New()
+
+	buf.PutByte(protocol.CLCMove)
+	buf.PutByte(cmd.Checksum)
+	buf.PutByte(cmd.Lossage)
+
+	if cmd.Null != nil {
+		buf.PutBytes(cmd.Null.Bytes())
+	}
+
+	if cmd.Old != nil {
+		buf.PutBytes(cmd.Old.Bytes())
+	}
+
+	if cmd.New != nil {
+		buf.PutBytes(cmd.New.Bytes())
+	}
+
+	return buf.Bytes()
+}
+
+func (cmd *Command) GetChecksum(sequence uint32) byte {
+	b := slices.Concat(
+		[]byte{cmd.Lossage},
+		cmd.Null.Bytes(),
+		cmd.Old.Bytes(),
+		cmd.New.Bytes(),
+	)
+
+	return crc.Byte(b, int(sequence))
+}
+
+func Parse(ctx *context.Context, buf *buffer.Buffer) (*Command, error) {
+	var err error
+	var cmd Command
+
+	if cmd.Checksum, err = buf.ReadByte(); err != nil {
+		return nil, err
+	}
+
+	if cmd.Lossage, err = buf.ReadByte(); err != nil {
+		return nil, err
+	}
+
+	if cmd.Null, err = deltausercommand.Parse(ctx, buf); err != nil {
+		return nil, err
+	}
+
+	if cmd.Old, err = deltausercommand.Parse(ctx, buf); err != nil {
+		return nil, err
+	}
+
+	if cmd.New, err = deltausercommand.Parse(ctx, buf); err != nil {
+		return nil, err
+	}
+
+	return &cmd, nil
+}