/*
 * (C) 2014 by Harald Welte <laforge@gnumonks.org>
 * All Rights Reserved
 *
 * SPDX-License-Identifier: GPL-2.0+
 *
 * 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.
 *
 */


#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include <osmocom/core/byteswap.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gsm/protocol/gsm_03_41.h>

/*! \addtogroup sms
 *  @{
 *  \file gsm0341.c
 */

/*! Encode a 3GPP TS 03.41 SMS-CB message
 *  \param[in] ctx talloc allocation context
 *  \param[in] geo_scope Geographic Scope
 *  \param[in] msg_code Message Code
 *  \param[in] update Is this an update?
 *  \param[in] msg_id Message ID
 *  \param[in] dcs Data Coding Scheme
 *  \param[in] page_total Total number of pages
 *  \param[in] page_cur Current Page (up to \a page_total)
 *  \param[in] data Message data (copied 1:1)
 *  \param[in] len Length of \a data in bytes (up to 88)
 *  \returns callee-allocated TS 03.41 message with encoded data */
struct gsm341_ms_message *
gsm0341_build_msg(void *ctx, uint8_t geo_scope, uint8_t msg_code,
		  uint8_t update, uint16_t msg_id, uint8_t dcs,
		  uint8_t page_total, uint8_t page_cur,
		  uint8_t *data, uint8_t len)
{
	struct gsm341_ms_message *cbmsg;

	msg_id = osmo_htons(msg_id);

	if (len > 88)
		return NULL;

	cbmsg = talloc_zero_size(ctx, sizeof(*cbmsg)+len);
	if (!cbmsg)
		return NULL;

	cbmsg->serial.code_hi = (msg_code >> 4) & 0xF;
	cbmsg->serial.gs = geo_scope;
	cbmsg->serial.update = update;
	cbmsg->serial.code_lo = msg_code & 0xF;
	cbmsg->msg_id = msg_id;
	cbmsg->dcs.group = dcs >> 4;
	cbmsg->dcs.language = dcs & 0xF;
	cbmsg->page.total = page_total;
	cbmsg->page.current = page_cur;
	memcpy(cbmsg->data, data, len);

	return cbmsg;
}

/*! @} */