/*
   SIA-HS Alarm Monitoring Service
   Copyright (C) Wilco Baan Hofman <wilco@baanhofman.nl> 2012

   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 3 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, see <http://www.gnu.org/licenses/>.
*/
struct siahs_packet {
	uint32_t len;
	char unknown1; /* 0x01 */
	char unknown2; /* 0x01 */
	uint16_t unknown3; /* '0xcfff' big endian */

	/* From this point XOR encoded with either 0xB6 or 0x85 */
	char *device;
	uint16_t prom;
	uint8_t unknown4; /* 0x01 */
	uint8_t unknown5; /* 0x2C */
	uint8_t unknown6; /* 0x01 */
	char *message;
	uint16_t checksum;
};

const uint8_t xor_table[] = { 0x51, 0x7a, 0x26, 0x3d, 0x22, 0x21, 0x3b, 0x74,
                              0x31, 0x30, 0x74, 0x27, 0x3b, 0x30, 0x3d, 0x22,
                              0x21, 0x3b, 0x74, 0x27, 0x3b, 0x74, 0x39, 0x31,
                              0x3c, 0x37, 0x3a, 0x31, 0x74, 0x31, 0x27, 0x74,
                              0x39, 0x31, 0x3a, 0x74, 0x78, 0x26, 0x31, 0x22,
                              0x74, 0x31, 0x30, 0x74, 0x39, 0x35, 0x20, 0x26,
                              0x35, 0x32, 0x74, 0x31, 0x27, 0x74, 0x3b, 0xb7,
                              0x3a, 0x74, 0x27, 0x3b, 0x3c, 0x38, 0x3b, 0x74,
                              0x27, 0x3b, 0x6f, 0xc1, 0x26, 0x3d, 0x39, 0x3d,
                              0x26, 0x24, 0x2c, 0x31, 0x74, 0x31, 0x30, 0x3b,
                              0x24, 0x74, 0x27, 0x35, 0x74, 0x39, 0xbd, 0x21,
                              0x33, 0x3a, 0x3d, 0x3a, 0x74, 0x31, 0x21, 0x25,
                              0x74, 0x78, 0x27, 0x3d, 0x35, 0x20, 0x74, 0x27,
                              0x35, 0x26, 0x3d, 0x31, 0x27, 0x3a, 0x35, 0x37,
                              0x74, 0x3b, 0xb7, 0x27, 0x74, 0x27, 0x35, 0x27,
                              0x3d, 0x3b, 0x37, 0x74, 0x27, 0x35, 0x74, 0x27,
                              0x35, 0x30, 0x3b, 0x00, 0xfb, 0x7a, 0x26, 0x31,
                              0x26, 0x26, 0x3b, 0x37, 0x74, 0x35, 0x74, 0x27,
                              0x31, 0x38, 0x31, 0x74, 0x39, 0x35, 0x3a, 0x26,
                              0x3b, 0x20, 0x74, 0xb5, 0x38, 0x74, 0x35, 0x26,
                              0x35, 0x24, 0x74, 0x78, 0x27, 0x3b, 0x3d, 0x26,
                              0x74, 0x27, 0x3b, 0x74, 0x39, 0x31, 0x26, 0x26,
                              0x3b, 0x37, 0x74, 0x31, 0x30, 0x3a, 0x3b, 0x74,
                              0x35, 0x26, 0x35, 0x24, 0x74, 0x26, 0x35, 0x33,
                              0x21, 0x38, 0x74, 0x3b, 0x35, 0x9a, 0x6f, 0x31,
                              0x3c, 0x37, 0x3a, 0x31, 0x74, 0x31, 0x27, 0x74,
                              0x3b, 0xb7, 0x3a, 0x74, 0x26, 0x35, 0x39, 0x74,
                              0x3b, 0x74, 0x31, 0x74, 0x78, 0x26, 0x35, 0x39,
                              0x74, 0x3b, 0x74, 0x35, 0x26, 0x35, 0x24, 0x74,
                              0x39, 0x31, 0x26, 0x26, 0x3b, 0x37, 0x74, 0x27,
                              0x3b, 0x3d, 0x26, 0x74, 0x27, 0x3b, 0x74, 0x27,
                              0x3b, 0x30, 0x3b, 0x00, 0xaa, 0x11, 0x46, 0x54,
};