Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 12 Mar 2003 03:51:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 12 Mar 2003 03:51:22 -0500 Received: from cs-ats40.donpac.ru ([217.107.128.161]:22538 "EHLO pazke") by vger.kernel.org with ESMTP id ; Wed, 12 Mar 2003 03:51:16 -0500 Date: Wed, 12 Mar 2003 12:01:59 +0300 To: linux-kernel@vger.kernel.org Cc: Linus Torvalds Subject: [PATCH] consolidate crc16 calculations (common part) Message-ID: <20030312090159.GA1393@pazke> Mail-Followup-To: linux-kernel@vger.kernel.org, Linus Torvalds Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="liqSWPDvh3eyfZ9k" Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Uname: Linux 2.4.20aa1 i686 unknown From: Andrey Panin Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5655 Lines: 155 --liqSWPDvh3eyfZ9k Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, yet another resend of crc16 patched is started :) Attached patch (2.5.64) creates crc16.c module. It will be used by async ppp, irda and isdn subsystems. Please consider applying. Best regards. -- Andrey Panin | Embedded systems software developer pazke@orbita1.ru | PGP key: wwwkeys.pgp.net --liqSWPDvh3eyfZ9k Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=patch-crc16 diff -urN -X /usr/share/dontdiff linux-2.5.64.vanilla/lib/Kconfig linux-2.5.64/lib/Kconfig --- linux-2.5.64.vanilla/lib/Kconfig Thu Nov 28 01:36:05 2002 +++ linux-2.5.64/lib/Kconfig Sun Mar 9 23:40:35 2003 @@ -4,6 +4,14 @@ menu "Library routines" +config CRC16 + tristate "CRC16 functions" + help + This option is provided for the case where no in-kernel-tree + modules require CRC16 functions, but a module built outside the + kernel tree does. Such modules that use library CRC16 functions + require M here. + config CRC32 tristate "CRC32 functions" help diff -urN -X /usr/share/dontdiff linux-2.5.64.vanilla/lib/Makefile linux-2.5.64/lib/Makefile --- linux-2.5.64.vanilla/lib/Makefile Mon Mar 10 00:52:21 2003 +++ linux-2.5.64/lib/Makefile Sun Mar 9 23:40:35 2003 @@ -19,6 +19,7 @@ obj-y += dec_and_lock.o endif +obj-$(CONFIG_CRC16) += crc16.o obj-$(CONFIG_CRC32) += crc32.o obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/ diff -urN -X /usr/share/dontdiff linux-2.5.64.vanilla/lib/crc16.c linux-2.5.64/lib/crc16.c --- linux-2.5.64.vanilla/lib/crc16.c Thu Jan 1 03:00:00 1970 +++ linux-2.5.64/lib/crc16.c Sun Mar 9 23:44:22 2003 @@ -0,0 +1,72 @@ +/* + * linux/lib/crc16.c + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include +#include +#include + +/* + * This mysterious table is just the CRC of each possible byte. It can be + * computed using the standard bit-at-a-time methods. The polynomial can + * be seen in entry 128, 0x8408. This corresponds to x^0 + x^5 + x^12. + * Add the implicit x^16, and you have the standard CRC-CCITT. + */ +u16 const crc16_table[256] = { + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; +EXPORT_SYMBOL(crc16_table); + +/** + * crc16 - recompute the CRC for the data buffer + * @crc - previous CRC value + * @buffer - data pointer + * @len - number of bytes in the buffer + */ +u16 crc16(u16 crc, u8 const *buffer, size_t len) +{ + if (len) { + do { + crc = crc16_byte(crc, *buffer++); + } while (--len); + } + return crc; +} +EXPORT_SYMBOL(crc16); + +MODULE_DESCRIPTION("CRC16 calculations"); +MODULE_LICENSE("GPL"); diff -urN -X /usr/share/dontdiff linux-2.5.64.vanilla/include/linux/crc16.h linux-2.5.64/include/linux/crc16.h --- linux-2.5.64.vanilla/include/linux/crc16.h Thu Jan 1 03:00:00 1970 +++ linux-2.5.64/include/linux/crc16.h Sun Mar 9 23:40:35 2003 @@ -0,0 +1,15 @@ +#ifndef _LINUX_CRC16_H +#define _LINUX_CRC16_H + +#include + +extern u16 const crc16_table[256]; + +extern u16 crc16(u16 crc, const u8 *buffer, size_t len); + +static inline u16 crc16_byte(u16 crc, const u8 c) +{ + return (crc >> 8) ^ crc16_table[(crc ^ c) & 0xff]; +} + +#endif /* _LINUX_CRC16_H */ --liqSWPDvh3eyfZ9k-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/