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/*
* 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 */
};
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;
}
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