Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/encoding.h

131 lines
4.2 KiB

/* encoding.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* 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>
#ifdef __cplusplus
extern "C" {
#endif
#include <osmocom/gsm/l1sap.h>
#include "coding_scheme.h"
#include "gsm_rlcmac.h"
#ifdef __cplusplus
}
#endif
struct gprs_rlcmac_tbf;
struct bitvec;
struct gprs_llc;
struct gprs_rlc_data_block_info;
#ifdef __cplusplus
/**
* I help with encoding data into CSN1 messages.
* TODO: Nobody can remember a function signature like this. One should
* fill out a struct with the request parameters and then hand the struct
* to the code.
*/
class Encoding {
public:
static int write_immediate_assignment(
const struct gprs_rlcmac_pdch *pdch,
struct gprs_rlcmac_tbf *tbf,
bitvec * dest, bool downlink, uint16_t ra,
uint32_t ref_fn, uint8_t ta,
uint8_t usf, bool polling,
uint32_t fn, uint8_t alpha, uint8_t gamma,
int8_t ta_idx,
enum ph_burst_type burst_type);
static int write_immediate_assignment_reject(
bitvec *dest, uint16_t ra,
uint32_t ref_fn,
enum ph_burst_type burst_type,
uint8_t t3142
);
static void encode_rbb(const char *show_rbb, bitvec *rbb);
static int write_paging_request(bitvec * dest, const struct osmo_mobile_identity *mi);
static unsigned write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len,
uint8_t *identity, uint8_t chan_needed);
static unsigned write_packet_paging_request(bitvec * dest);
static int rlc_write_dl_data_header(
const struct gprs_rlc_data_info *rlc,
uint8_t *data);
static unsigned int rlc_copy_from_aligned_buffer(
const struct gprs_rlc_data_info *rlc,
unsigned int data_block_idx,
uint8_t *dst, const uint8_t *buffer);
enum AppendResult {
AR_NEED_MORE_BLOCKS,
AR_COMPLETED_SPACE_LEFT,
AR_COMPLETED_BLOCK_FILLED,
};
static AppendResult rlc_data_to_dl_append(
struct gprs_rlc_data_block_info *rdbi, enum CodingScheme cs,
gprs_llc *llc, int *offset, int *num_chunks,
uint8_t *data, bool is_final, int *count_payload);
static void rlc_data_to_dl_append_egprs_li_padding(
const struct gprs_rlc_data_block_info *rdbi,
int *offset, int *num_chunks, uint8_t *data_block);
};
#endif /* ifdef __cplusplus */
#ifdef __cplusplus
extern "C" {
#endif
void write_packet_access_reject(struct bitvec *dest, uint32_t tlli, unsigned long t3172_ms);
void write_packet_uplink_assignment(RlcMacDownlink_t *block, uint8_t old_tfi,
uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli,
const struct gprs_rlcmac_ul_tbf *tbf, uint8_t poll,
uint8_t rrbp, uint8_t alpha, uint8_t gamma, int8_t ta_idx,
bool use_egprs);
void write_packet_downlink_assignment(RlcMacDownlink_t * block, bool old_tfi_is_valid,
uint8_t old_tfi, uint8_t old_downlink,
const struct gprs_rlcmac_dl_tbf *tbf, uint8_t poll,
uint8_t rrbp, uint8_t alpha, uint8_t gamma,
int8_t ta_idx, uint8_t ta_ts, bool use_egprs,
uint8_t control_ack);
void write_packet_uplink_ack(struct bitvec *dest, struct gprs_rlcmac_ul_tbf *tbf,
bool is_final, uint8_t rrbp);
void write_packet_neighbour_cell_data(RlcMacDownlink_t *block,
bool tfi_is_dl, uint8_t tfi, uint8_t container_id,
uint8_t container_idx, PNCDContainer_t *container);
void write_packet_cell_change_continue(RlcMacDownlink_t *block, uint8_t poll, uint8_t rrbp,
bool tfi_is_dl, uint8_t tfi, bool exist_id,
uint16_t arfcn, uint8_t bsic, uint8_t container_id);
#ifdef __cplusplus
}
#endif