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authorIvo van Doorn <IvDoorn@gmail.com>2006-06-12 16:17:04 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2007-05-10 18:24:13 +0200
commit3e7cbae7c6dda18d427335b3ad98f1a0d40ef30c (patch)
tree2ac604d8d6f4eb671e23c9b6a405c37b92fa8df3 /include/linux/crc-itu-t.h
parent9640d3d775aa325650c8fcdf49127542f77b2156 (diff)
CRC ITU-T V.41
This will add the CRC calculation according to the CRC ITU-T V.41 to the kernel lib/ folder. This code has been derived from the rt2x00 driver, currently found only in the wireless-dev tree, but this library is generic and could be used by more drivers who currently use their own implementation. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Also useful for the new firewire stack. Signed-off-by: Kristian Hoegsberg <krh@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'include/linux/crc-itu-t.h')
-rw-r--r--include/linux/crc-itu-t.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/crc-itu-t.h b/include/linux/crc-itu-t.h
new file mode 100644
index 000000000000..84920f3cc83e
--- /dev/null
+++ b/include/linux/crc-itu-t.h
@@ -0,0 +1,28 @@
+/*
+ * crc-itu-t.h - CRC ITU-T V.41 routine
+ *
+ * Implements the standard CRC ITU-T V.41:
+ * Width 16
+ * Poly 0x0x1021 (x^16 + x^12 + x^15 + 1)
+ * Init 0
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#ifndef CRC_ITU_T_H
+#define CRC_ITU_T_H
+
+#include <linux/types.h>
+
+extern u16 const crc_itu_t_table[256];
+
+extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
+
+static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
+{
+ return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
+}
+
+#endif /* CRC_ITU_T_H */
+