From c21cfaa023686c0c4ff041199ed6a04e48f79d15 Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther Date: Fri, 10 Dec 2010 03:53:28 +0100 Subject: isup: Start parsing the ISUP messages Introduce a ISUP debug category, parse the reset circuit message, add a test case for this easy parsing. --- src/isup.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/isup.c (limited to 'src/isup.c') diff --git a/src/isup.c b/src/isup.c new file mode 100644 index 0000000..a98e4b5 --- /dev/null +++ b/src/isup.c @@ -0,0 +1,51 @@ +/* + * (C) 2010 by Holger Hans Peter Freyther + * (C) 2010 by On-Waves + * All Rights Reserved + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include +#include + +/* this message contains the range */ +int isup_parse_grs(const uint8_t *data, uint8_t in_length) +{ + uint8_t ptr; + uint8_t length; + + if (in_length > 3) { + LOGP(DISUP, LOGL_ERROR, "This needs three bytes.\n"); + return -1; + } + + ptr = data[0]; + if (1 + ptr > in_length) { + LOGP(DISUP, LOGL_ERROR, "Pointing outside the packet.\n"); + return -1; + } + + length = data[0 + ptr]; + + if (1 + ptr + 1 > in_length) { + LOGP(DISUP, LOGL_ERROR, "No space for the data.\n"); + return -1; + } + + return data[0 + ptr + 1]; +} + -- cgit v1.2.3