1 files changed, 71 insertions, 0 deletions
diff --git a/src/rlc_window.h b/src/rlc_window.h
new file mode 100644
index 00000000..1b0227f4
--- /dev/null
+++ b/src/rlc_window.h
@@ -0,0 +1,71 @@
+/* RLC Window (common for both UL/DL TBF), 3GPP TS 44.060
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ * Copyright (C) 2023 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#pragma once
+
+#include <stdint.h>
+
+#include "rlc.h"
+
+#define RLC_GPRS_WS  64 /* max window size */
+#define RLC_EGPRS_MIN_WS 64 /* min window size */
+#define RLC_EGPRS_MAX_WS 1024 /* min window size */
+#define RLC_EGPRS_MAX_BSN_DELTA 512
+#define RLC_MAX_WS   RLC_EGPRS_MAX_WS
+
+class gprs_rlc_window {
+public:
+	gprs_rlc_window();
+
+	const uint16_t mod_sns(void) const;
+	const uint16_t mod_sns(uint16_t bsn) const;
+	const uint16_t sns(void) const;
+	const uint16_t ws(void) const;
+
+	void set_sns(uint16_t sns);
+	void set_ws(uint16_t ws);
+
+protected:
+	uint16_t m_sns;
+	uint16_t m_ws;
+};
+
+
+inline gprs_rlc_window::gprs_rlc_window(void)
+	: m_sns(RLC_GPRS_SNS)
+	, m_ws(RLC_GPRS_WS)
+{
+}
+
+inline const uint16_t gprs_rlc_window::sns(void) const
+{
+	return m_sns;
+}
+
+inline const uint16_t gprs_rlc_window::ws(void) const
+{
+	return m_ws;
+}
+
+inline const uint16_t gprs_rlc_window::mod_sns(void) const
+{
+	return sns() - 1;
+}
+
+inline const uint16_t gprs_rlc_window::mod_sns(uint16_t bsn) const
+{
+	return bsn & mod_sns();
+}