134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/* encoding.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <osmocom/gsm/l1sap.h>
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#include "coding_scheme.h"
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#include "gsm_rlcmac.h"
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#ifdef __cplusplus
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}
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#endif
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struct gprs_rlcmac_tbf;
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struct bitvec;
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struct gprs_llc;
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struct gprs_rlc_data_block_info;
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#ifdef __cplusplus
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/**
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* I help with encoding data into CSN1 messages.
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* TODO: Nobody can remember a function signature like this. One should
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* fill out a struct with the request parameters and then hand the struct
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* to the code.
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*/
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class Encoding {
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public:
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static int write_immediate_assignment(
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const struct gprs_rlcmac_pdch *pdch,
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struct gprs_rlcmac_tbf *tbf,
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bitvec * dest, bool downlink, uint16_t ra,
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uint32_t ref_fn, uint8_t ta,
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uint8_t usf, bool polling,
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uint32_t fn, uint8_t alpha, uint8_t gamma,
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int8_t ta_idx,
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enum ph_burst_type burst_type);
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static int write_immediate_assignment_reject(
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bitvec *dest, uint16_t ra,
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uint32_t ref_fn,
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enum ph_burst_type burst_type
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);
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static void write_packet_uplink_assignment(
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RlcMacDownlink_t * block, uint8_t old_tfi,
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uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli,
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const struct gprs_rlcmac_ul_tbf *tbf, uint8_t poll, uint8_t rrbp,
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uint8_t alpha, uint8_t gamma, int8_t ta_idx,
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bool use_egprs);
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static void write_packet_downlink_assignment(RlcMacDownlink_t * block,
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bool old_tfi_is_valid, uint8_t old_tfi, uint8_t old_downlink,
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const struct gprs_rlcmac_dl_tbf *tbf, uint8_t poll, uint8_t rrbp,
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uint8_t alpha, uint8_t gamma,
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int8_t ta_idx, uint8_t ta_ts, bool use_egprs);
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static void encode_rbb(const char *show_rbb, uint8_t *rbb);
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static void write_packet_access_reject(
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bitvec * dest, uint32_t tlli);
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static void write_packet_uplink_ack(
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bitvec * dest, struct gprs_rlcmac_ul_tbf *tbf, bool is_final,
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uint8_t rrbp);
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static int write_paging_request(bitvec * dest, const struct osmo_mobile_identity *mi);
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static unsigned write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len,
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uint8_t *identity, uint8_t chan_needed);
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static unsigned write_packet_paging_request(bitvec * dest);
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static int rlc_write_dl_data_header(
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const struct gprs_rlc_data_info *rlc,
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uint8_t *data);
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static unsigned int rlc_copy_from_aligned_buffer(
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const struct gprs_rlc_data_info *rlc,
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unsigned int data_block_idx,
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uint8_t *dst, const uint8_t *buffer);
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enum AppendResult {
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AR_NEED_MORE_BLOCKS,
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AR_COMPLETED_SPACE_LEFT,
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AR_COMPLETED_BLOCK_FILLED,
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};
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static AppendResult rlc_data_to_dl_append(
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struct gprs_rlc_data_block_info *rdbi, enum CodingScheme cs,
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gprs_llc *llc, int *offset, int *num_chunks,
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uint8_t *data, bool is_final, int *count_payload);
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static void rlc_data_to_dl_append_egprs_li_padding(
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const struct gprs_rlc_data_block_info *rdbi,
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int *offset, int *num_chunks, uint8_t *data_block);
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};
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#endif /* ifdef __cplusplus */
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#ifdef __cplusplus
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extern "C" {
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#endif
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void write_packet_neighbour_cell_data(RlcMacDownlink_t *block,
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bool tfi_is_dl, uint8_t tfi, uint8_t container_id,
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uint8_t container_idx, PNCDContainer_t *container);
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void write_packet_cell_change_continue(RlcMacDownlink_t *block, uint8_t poll, uint8_t rrbp,
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bool tfi_is_dl, uint8_t tfi, bool exist_id,
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uint16_t arfcn, uint8_t bsic, uint8_t container_id);
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#ifdef __cplusplus
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}
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#endif
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