From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libucsi/crc32.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 lib/libucsi/crc32.h (limited to 'lib/libucsi/crc32.h') diff --git a/lib/libucsi/crc32.h b/lib/libucsi/crc32.h new file mode 100644 index 0000000..7d781ce --- /dev/null +++ b/lib/libucsi/crc32.h @@ -0,0 +1,58 @@ +/** + * crc32 calculation routines. + * + * Copyright (c) 2005 by Andrew de Quincey + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#ifndef _UCSI_CRC32_H +#define _UCSI_CRC32_H 1 + +#include + +#ifdef __cplusplus +extern "C" +{ +#endif + +#define CRC32_INIT (~0) + +extern uint32_t crc32tbl[]; + +/** + * Calculate a CRC32 over a piece of data. + * + * @param crc Current CRC value (use CRC32_INIT for first call). + * @param buf Buffer to calculate over. + * @param len Number of bytes. + * @return Calculated CRC. + */ +static inline uint32_t crc32(uint32_t crc, uint8_t* buf, size_t len) +{ + size_t i; + + for (i=0; i< len; i++) { + crc = (crc << 8) ^ crc32tbl[((crc >> 24) ^ buf[i]) & 0xff]; + } + + return crc; +} + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3