/* *****************************************************************************
 * legacy/recv.c -- receive a legacy packet.
 * Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libp7.
 * libp7 is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3.0 of the License,
 * or (at your option) any later version.
 *
 * libp7 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libp7; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************** */
#include <libp7/internals.h>

/* ************************************************************************** */
/*  Receive the packet                                                        */
/* ************************************************************************** */
/**
 *	p7_legacy_recv:
 *	Receive a [legacy] packet.
 *
 *	This is the main receiving function for legacy protocol(s).
 *	It checks the first byte, and if it is a header, it reads the header/part
 *	using libg1m.
 *
 *	@arg	handle		the libp7 handle
 *	@return				the error (0 if ok)
 */

static int p7_legacy_recv(p7_handle_t *handle)
{
	/* get the first character */
	log_info("receiving packet...");
	uint8_t byte; if ((err = p7_read(&handle->_stream, &byte, 1)))
		return (err);
	if (byte != ':') switch (byte) {
		/* initial packets */
		case 0x15: /* is interactive initial packet */
		case 0x16: resp.type = p7_pt_ini; return (0);

		/* initial packet response */
		case 0x13: resp.type = p7_pt_ini_resp; return (0);

		/* ack */
		case 0x06: resp.type = p7_pt_ack; return (0);

		/* unknown data type */
		case 0x00: case 0x24: return (0);

		/* checksum error */
		case 0x2B: return (0);

		/* abort XXX */
		case 0x15: return (0);

		/* we don't know this */
		default: return (p7_error_unknown);
	}

	/* unknown packet! */
	return (p7_error_unknown);
}