crc-itu-t

PATCH RESEND In review Ivo van Doorn 1 participant 1 message Jan 3, 2007

Subsystems (4)

Networking Network drivers Library code CRC library

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Ivo van Doorn

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2007-01-03 20:30 UTC #0 lore raw

PATCH RESEND 3/4 crc-itu-t

This patch add the crc-itu-t implementation to the lib folder.
This crc handler uses the CRC ITU-T V.41 routine that is used in multiple drivers.

Signed-off-by Ivo van Doorn <[email protected]>

---

include/linux/crc-itu-t.h +27 -0

diff -rNU3 wireless-dev/include/linux/crc-itu-t.h wireless-dev_crc/include/linux/crc-itu-t.h
@@ -0,0 +1,27 @@
+/*
+ *	crc-itu-t.h - CRC ITU-T V.41 routine
+ *
+ * Implements the standard CRC ITU-T V.41:
+ *   Width 16
+ *   Poly  0x1021 (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 */

lib/Kconfig +8 -0

diff -rNU3 wireless-dev/lib/Kconfig wireless-dev_crc/lib/Kconfig
@@ -29,6 +29,14 @@
 	  kernel tree does. Such modules that use library CRC32 functions
 	  require M here.
 
+config CRC_ITU_T
+	tristate "CRC ITU-T V.41 functions"
+	help
+	  This option is provided for the case where no in-kernel-tree
+	  modules require CRC ITU-T V.41 functions, but a module built outside
+	  the kernel tree does. Such modules that use library CRC ITU-T V.41
+	  functions require M here.
+
 config LIBCRC32C
 	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 	help

lib/Makefile +1 -0

diff -rNU3 wireless-dev/lib/Makefile wireless-dev_crc/lib/Makefile
@@ -38,6 +38,7 @@
 obj-$(CONFIG_CRC_CCITT)	+= crc-ccitt.o
 obj-$(CONFIG_CRC16)	+= crc16.o
 obj-$(CONFIG_CRC32)	+= crc32.o
+obj-$(CONFIG_CRC_ITU_T)	+= crc-itu-t.o
 obj-$(CONFIG_LIBCRC32C)	+= libcrc32c.o
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
 obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o

lib/crc-itu-t.c +64 -0

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