1 files changed, 92 insertions, 0 deletions
diff --git a/src/llc.h b/src/llc.h
new file mode 100644
index 00000000..1f0c1146
--- /dev/null
+++ b/src/llc.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2013 by Holger Hans Peter Freyther
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+
+#define LLC_MAX_LEN 1543
+
+/**
+ * I represent the LLC data to a MS
+ */
+struct gprs_llc {
+	static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv);
+	static bool is_frame_expired(struct timeval *now, struct timeval *tv);
+
+	void init();
+	void reset();
+	void reset_frame_space();
+
+	void enqueue(struct msgb *llc_msg);
+	struct msgb *dequeue();
+
+	void put_frame(const uint8_t *data, size_t len);
+	void append_frame(const uint8_t *data, size_t len);
+
+	void consume(size_t len);
+	void consume(uint8_t *data, size_t len);
+	void clear(BTS *bts);
+
+	uint16_t chunk_size() const;
+	uint16_t remaining_space() const;
+	uint16_t frame_length() const;
+
+	bool fits_in_current_frame(uint8_t size) const;
+
+	uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */
+	uint16_t m_index; /* current write/read position of frame */
+	uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */
+	struct llist_head queue; /* queued LLC DL data */
+
+	uint32_t m_avg_queue_delay; /* Average delay of data going through the queue */
+	size_t m_queue_size;
+};
+
+inline uint16_t gprs_llc::chunk_size() const
+{
+	return m_length - m_index;
+}
+
+inline uint16_t gprs_llc::remaining_space() const
+{
+	return LLC_MAX_LEN - m_length;
+}
+
+inline uint16_t gprs_llc::frame_length() const
+{
+	return m_length;
+}
+
+inline void gprs_llc::consume(size_t len)
+{
+	m_index += len;
+}
+
+inline void gprs_llc::consume(uint8_t *data, size_t len)
+{
+	/* copy and increment index */
+	memcpy(data, frame + m_index, len);
+	consume(len);
+}
+
+inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const
+{
+	return m_length + chunk_size <= LLC_MAX_LEN;
+}