130 lines
3.2 KiB
Plaintext
130 lines
3.2 KiB
Plaintext
/*
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* (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All rights reserved.
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*
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* Author: Pau Espin Pedrol <pespin@sysmocom.de>
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*
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* Released under the terms of GNU General Public License, Version 2 or
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* (at your option) any later version.
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*/
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module OSMUX_Types {
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import from General_Types all;
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import from Misc_Helpers all;
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import from AMR_Types all;
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external function enc_OSMUX_PDU ( in OSMUX_PDU msg ) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_OSMUX_PDU ( in octetstring msg ) return OSMUX_PDU
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with { extension "prototype(convert) decode(RAW)" };
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type INT1 OsmuxCID (0 .. 255);
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type enumerated OsmuxFT {
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OSMUX_FT_LAPD,
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OSMUX_FT_AMR,
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OSMUX_FT_DUMMY
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};
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type record Osmux_AMR_header {
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BIT1 marker,
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INT2b ft,
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INT3b ctr,
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BIT1 amr_f,
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BIT1 amr_q,
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INT1 seq,
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OsmuxCID cid,
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INT4b amr_ft,
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INT4b amr_cmr
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} with {
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variant "FIELDORDER(msb)"
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}
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type record PDU_Osmux_AMR {
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Osmux_AMR_header header,
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octetstring data
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} with {
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variant "FIELDORDER(msb)"
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};
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type record PDU_Osmux_DUMMY {
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Osmux_AMR_header header,
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octetstring data
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} with {
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variant "FIELDORDER(msb)"
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};
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type record Osmux_session_par {
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integer id optional,
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charstring local_address optional,
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integer local_port optional,
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charstring dest_address optional,
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integer dest_port optional
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}
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type record ASP_Osmux_Open_session {
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Osmux_session_par session_id
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}
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type record ASP_Osmux_Open_session_result {
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Osmux_session_par session_id
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}
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type record ASP_Osmux_Close_session {
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Osmux_session_par session_id
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}
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type union OSMUX_PDU {
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PDU_Osmux_AMR osmux_amr,
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PDU_Osmux_DUMMY osmux_dummy
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} with {
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variant "TAG (
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osmux_amr, header.ft = 1;
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osmux_dummy, header.ft = 2;
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)"
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};
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template (present) OSMUX_PDU tr_PDU_Osmux_AMR(template (present) BIT1 marker := ?,
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template (present) INT3b ctr := ?,
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template (present) BIT1 amr_f := ?,
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template (present) BIT1 amr_q := ?,
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template (present) INT1 seq := ?,
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template (present) OsmuxCID cid := ?,
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template (present) INT4b amr_ft := ?,
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template (present) INT4b amr_cmr := ?,
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template (present) octetstring payload := ?) := {
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osmux_amr := {
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header := {
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marker := marker,
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ft := 1,
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ctr := ctr,
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amr_f := amr_f,
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amr_q := amr_q,
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seq := seq,
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cid := cid,
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amr_ft := amr_ft,
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amr_cmr := amr_cmr
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},
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data := payload
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}
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}
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/* Get Nth AMR payload of osmux AMR frame (starting from 0) */
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function f_osmux_amr_get_nth_amr_payload(PDU_Osmux_AMR osmux_amr, integer nth) return octetstring
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{
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var integer amr_pl_len := f_amrft_payload_len(osmux_amr.header.amr_ft);
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if (nth > osmux_amr.header.ctr) {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "nth > ctr");
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return ''O;
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}
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if (amr_pl_len * (nth+1) > lengthof(osmux_amr.data)) {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "osmux payload too short");
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}
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var octetstring pl := substr(osmux_amr.data, amr_pl_len * nth, amr_pl_len);
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return pl;
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}
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} with { encode "RAW"}
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