Move CRC-CCITT table and helper into separate file

1 files changed, 33 insertions, 0 deletions

diff --git a/gatchat/crc-ccitt.h b/gatchat/crc-ccitt.h
new file mode 100644
index 00000000..60d20729
--- /dev/null
+++ b/gatchat/crc-ccitt.h
@@ -0,0 +1,33 @@
+/*
+ *
+ *  AT chat library with GLib integration
+ *
+ *  Copyright (C) 2008-2010  Intel Corporation. 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 version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glib.h>
+
+extern guint16 const crc_ccitt_table[256];
+
+static inline guint16 crc_ccitt_byte(guint16 crc, const guint8 c)
+{
+	return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
+}