Added crc16 from linux kernel.
diff --git a/include/osmocore/crc16.h b/include/osmocore/crc16.h
new file mode 100644
index 0000000..7a51249
--- /dev/null
+++ b/include/osmocore/crc16.h
@@ -0,0 +1,34 @@
+/*
+ * This was copied from the linux kernel and adjusted for our types.
+ */
+/*
+ * crc16.h - CRC-16 routine
+ *
+ * Implements the standard CRC-16:
+ * Width 16
+ * Poly 0x8005 (x^16 + x^15 + x^2 + 1)
+ * Init 0
+ *
+ * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#ifndef __CRC16_H
+#define __CRC16_H
+
+#include <stdint.h>
+
+#include <sys/types.h>
+
+extern uint16_t const crc16_table[256];
+
+extern uint16_t crc16(uint16_t crc, const uint8_t *buffer, size_t len);
+
+static inline uint16_t crc16_byte(uint16_t crc, const uint8_t data)
+{
+ return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
+}
+
+#endif /* __CRC16_H */