112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/* crc8.c
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* Implementation CRC-8 declarations and routines
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*
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* 2011 Roland Knall <rknall@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <wsutil/crc8.h>
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/* @brief Precompiled table for CRC8 values for the polynom 0x2F */
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static const guint8 crc8_precompiled_2F[256] =
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{
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0x00, 0x2F, 0x5E, 0x71, 0xBC, 0x93, 0xE2, 0xCD,
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0x57, 0x78, 0x09, 0x26, 0xEB, 0xC4, 0xB5, 0x9A,
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0xAE, 0x81, 0xF0, 0xDF, 0x12, 0x3D, 0x4C, 0x63,
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0xF9, 0xD6, 0xA7, 0x88, 0x45, 0x6A, 0x1B, 0x34,
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0x73, 0x5C, 0x2D, 0x02, 0xCF, 0xE0, 0x91, 0xBE,
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0x24, 0x0B, 0x7A, 0x55, 0x98, 0xB7, 0xC6, 0xE9,
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0xDD, 0xF2, 0x83, 0xAC, 0x61, 0x4E, 0x3F, 0x10,
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0x8A, 0xA5, 0xD4, 0xFB, 0x36, 0x19, 0x68, 0x47,
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0xE6, 0xC9, 0xB8, 0x97, 0x5A, 0x75, 0x04, 0x2B,
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0xB1, 0x9E, 0xEF, 0xC0, 0x0D, 0x22, 0x53, 0x7C,
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0x48, 0x67, 0x16, 0x39, 0xF4, 0xDB, 0xAA, 0x85,
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0x1F, 0x30, 0x41, 0x6E, 0xA3, 0x8C, 0xFD, 0xD2,
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0x95, 0xBA, 0xCB, 0xE4, 0x29, 0x06, 0x77, 0x58,
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0xC2, 0xED, 0x9C, 0xB3, 0x7E, 0x51, 0x20, 0x0F,
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0x3B, 0x14, 0x65, 0x4A, 0x87, 0xA8, 0xD9, 0xF6,
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0x6C, 0x43, 0x32, 0x1D, 0xD0, 0xFF, 0x8E, 0xA1,
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0xE3, 0xCC, 0xBD, 0x92, 0x5F, 0x70, 0x01, 0x2E,
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0xB4, 0x9B, 0xEA, 0xC5, 0x08, 0x27, 0x56, 0x79,
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0x4D, 0x62, 0x13, 0x3C, 0xF1, 0xDE, 0xAF, 0x80,
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0x1A, 0x35, 0x44, 0x6B, 0xA6, 0x89, 0xF8, 0xD7,
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0x90, 0xBF, 0xCE, 0xE1, 0x2C, 0x03, 0x72, 0x5D,
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0xC7, 0xE8, 0x99, 0xB6, 0x7B, 0x54, 0x25, 0x0A,
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0x3E, 0x11, 0x60, 0x4F, 0x82, 0xAD, 0xDC, 0xF3,
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0x69, 0x46, 0x37, 0x18, 0xD5, 0xFA, 0x8B, 0xA4,
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0x05, 0x2A, 0x5B, 0x74, 0xB9, 0x96, 0xE7, 0xC8,
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0x52, 0x7D, 0x0C, 0x23, 0xEE, 0xC1, 0xB0, 0x9F,
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0xAB, 0x84, 0xF5, 0xDA, 0x17, 0x38, 0x49, 0x66,
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0xFC, 0xD3, 0xA2, 0x8D, 0x40, 0x6F, 0x1E, 0x31,
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0x76, 0x59, 0x28, 0x07, 0xCA, 0xE5, 0x94, 0xBB,
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0x21, 0x0E, 0x7F, 0x50, 0x9D, 0xB2, 0xC3, 0xEC,
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0xD8, 0xF7, 0x86, 0xA9, 0x64, 0x4B, 0x3A, 0x15,
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0x8F, 0xA0, 0xD1, 0xFE, 0x33, 0x1C, 0x6D, 0x42
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};
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/** Calculates a CRC8 checksum for the given buffer with the polynom
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* stored in the crc_table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @param crc_table a table storing 256 entries for crc8 checksums
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* @return the CRC8 checksum for the buffer
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*/
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static guint8 crc8_precompiled(guint8 *buf, guint32 len, guint8 seed, const guint8 crc_table[])
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{
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guint8 crc;
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crc = seed;
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while(len-- > 0)
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crc = crc_table[(guint8)(*buf++) ^ crc];
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return crc;
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}
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/** Calculates a CRC8 checksum for the given buffer with the polynom
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* 0x2F using the precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC8 checksum for the buffer
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*/
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guint8 crc8_0x2F(guint8 *buf, guint32 len, guint8 seed)
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{
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return crc8_precompiled(buf, len, seed, crc8_precompiled_2F);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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