skarg
303 lines
10 KiB
C
303 lines
10 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2004 Steve Karg
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307
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USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "crc.h"
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/** @file crc.c Calculate CRCs */
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#if defined(CRC_USE_TABLE)
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/* note: table is created using unit test below */
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static const uint8_t HeaderCRC[256] = {
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0x00, 0xfe, 0xff, 0x01, 0xfd, 0x03, 0x02, 0xfc,
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0xf9, 0x07, 0x06, 0xf8, 0x04, 0xfa, 0xfb, 0x05,
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0xf1, 0x0f, 0x0e, 0xf0, 0x0c, 0xf2, 0xf3, 0x0d,
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0x08, 0xf6, 0xf7, 0x09, 0xf5, 0x0b, 0x0a, 0xf4,
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0xe1, 0x1f, 0x1e, 0xe0, 0x1c, 0xe2, 0xe3, 0x1d,
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0x18, 0xe6, 0xe7, 0x19, 0xe5, 0x1b, 0x1a, 0xe4,
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0x10, 0xee, 0xef, 0x11, 0xed, 0x13, 0x12, 0xec,
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0xe9, 0x17, 0x16, 0xe8, 0x14, 0xea, 0xeb, 0x15,
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0xc1, 0x3f, 0x3e, 0xc0, 0x3c, 0xc2, 0xc3, 0x3d,
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0x38, 0xc6, 0xc7, 0x39, 0xc5, 0x3b, 0x3a, 0xc4,
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0x30, 0xce, 0xcf, 0x31, 0xcd, 0x33, 0x32, 0xcc,
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0xc9, 0x37, 0x36, 0xc8, 0x34, 0xca, 0xcb, 0x35,
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0x20, 0xde, 0xdf, 0x21, 0xdd, 0x23, 0x22, 0xdc,
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0xd9, 0x27, 0x26, 0xd8, 0x24, 0xda, 0xdb, 0x25,
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0xd1, 0x2f, 0x2e, 0xd0, 0x2c, 0xd2, 0xd3, 0x2d,
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0x28, 0xd6, 0xd7, 0x29, 0xd5, 0x2b, 0x2a, 0xd4,
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0x81, 0x7f, 0x7e, 0x80, 0x7c, 0x82, 0x83, 0x7d,
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0x78, 0x86, 0x87, 0x79, 0x85, 0x7b, 0x7a, 0x84,
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0x70, 0x8e, 0x8f, 0x71, 0x8d, 0x73, 0x72, 0x8c,
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0x89, 0x77, 0x76, 0x88, 0x74, 0x8a, 0x8b, 0x75,
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0x60, 0x9e, 0x9f, 0x61, 0x9d, 0x63, 0x62, 0x9c,
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0x99, 0x67, 0x66, 0x98, 0x64, 0x9a, 0x9b, 0x65,
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0x91, 0x6f, 0x6e, 0x90, 0x6c, 0x92, 0x93, 0x6d,
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0x68, 0x96, 0x97, 0x69, 0x95, 0x6b, 0x6a, 0x94,
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0x40, 0xbe, 0xbf, 0x41, 0xbd, 0x43, 0x42, 0xbc,
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0xb9, 0x47, 0x46, 0xb8, 0x44, 0xba, 0xbb, 0x45,
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0xb1, 0x4f, 0x4e, 0xb0, 0x4c, 0xb2, 0xb3, 0x4d,
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0x48, 0xb6, 0xb7, 0x49, 0xb5, 0x4b, 0x4a, 0xb4,
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0xa1, 0x5f, 0x5e, 0xa0, 0x5c, 0xa2, 0xa3, 0x5d,
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0x58, 0xa6, 0xa7, 0x59, 0xa5, 0x5b, 0x5a, 0xa4,
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0x50, 0xae, 0xaf, 0x51, 0xad, 0x53, 0x52, 0xac,
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0xa9, 0x57, 0x56, 0xa8, 0x54, 0xaa, 0xab, 0x55
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};
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uint8_t CRC_Calc_Header(
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uint8_t dataValue,
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uint8_t crcValue)
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{
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return HeaderCRC[crcValue ^ dataValue];
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}
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/* note: table is created using unit test below */
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static const uint16_t DataCRC[256] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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uint16_t CRC_Calc_Data(
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uint8_t dataValue,
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uint16_t crcValue)
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{
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return ((crcValue >> 8) ^ DataCRC[(crcValue & 0x00FF) ^ dataValue]);
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}
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#else
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/* Accumulate "dataValue" into the CRC in crcValue. */
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/* Return value is updated CRC */
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/* */
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/* The ^ operator means exclusive OR. */
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/* Note: This function is copied directly from the BACnet standard. */
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uint8_t CRC_Calc_Header(
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uint8_t dataValue,
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uint8_t crcValue)
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{
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uint16_t crc;
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crc = crcValue ^ dataValue; /* XOR C7..C0 with D7..D0 */
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/* Exclusive OR the terms in the table (top down) */
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crc = crc ^ (crc << 1) ^ (crc << 2) ^ (crc << 3)
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^ (crc << 4) ^ (crc << 5) ^ (crc << 6)
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^ (crc << 7);
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/* Combine bits shifted out left hand end */
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return (crc & 0xfe) ^ ((crc >> 8) & 1);
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}
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/* Accumulate "dataValue" into the CRC in crcValue. */
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/* Return value is updated CRC */
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/* */
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/* The ^ operator means exclusive OR. */
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/* Note: This function is copied directly from the BACnet standard. */
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uint16_t CRC_Calc_Data(
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uint8_t dataValue,
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uint16_t crcValue)
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{
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uint16_t crcLow;
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crcLow = (crcValue & 0xff) ^ dataValue; /* XOR C7..C0 with D7..D0 */
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/* Exclusive OR the terms in the table (top down) */
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return (crcValue >> 8) ^ (crcLow << 8) ^ (crcLow << 3)
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^ (crcLow << 12) ^ (crcLow >> 4)
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^ (crcLow & 0x0f) ^ ((crcLow & 0x0f) << 7);
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}
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#endif
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#ifdef TEST
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#include <assert.h>
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#include <string.h>
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#include "ctest.h"
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#include "bytes.h"
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/* test from Annex G 1.0 of BACnet Standard */
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void testCRC8(
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Test * pTest)
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{
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uint8_t crc = 0xff; /* accumulates the crc value */
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uint8_t frame_crc; /* appended to the end of the frame */
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crc = CRC_Calc_Header(0x00, crc);
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ct_test(pTest, crc == 0x55);
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crc = CRC_Calc_Header(0x10, crc);
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ct_test(pTest, crc == 0xC2);
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crc = CRC_Calc_Header(0x05, crc);
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ct_test(pTest, crc == 0xBC);
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crc = CRC_Calc_Header(0x00, crc);
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ct_test(pTest, crc == 0x95);
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crc = CRC_Calc_Header(0x00, crc);
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ct_test(pTest, crc == 0x73);
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/* send the ones complement of the CRC in place of */
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/* the CRC, and the resulting CRC will always equal 0x55. */
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frame_crc = ~crc;
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ct_test(pTest, frame_crc == 0x8C);
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/* use the ones complement value and the next to last CRC value */
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crc = CRC_Calc_Header(frame_crc, crc);
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ct_test(pTest, crc == 0x55);
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}
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/* test from Annex G 2.0 of BACnet Standard */
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void testCRC16(
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Test * pTest)
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{
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uint16_t crc = 0xffff;
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uint16_t data_crc;
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crc = CRC_Calc_Data(0x01, crc);
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ct_test(pTest, crc == 0x1E0E);
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crc = CRC_Calc_Data(0x22, crc);
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ct_test(pTest, crc == 0xEB70);
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crc = CRC_Calc_Data(0x30, crc);
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ct_test(pTest, crc == 0x42EF);
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/* send the ones complement of the CRC in place of */
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/* the CRC, and the resulting CRC will always equal 0xF0B8. */
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data_crc = ~crc;
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ct_test(pTest, data_crc == 0xBD10);
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crc = CRC_Calc_Data(LO_BYTE(data_crc), crc);
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ct_test(pTest, crc == 0x0F3A);
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crc = CRC_Calc_Data(HI_BYTE(data_crc), crc);
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ct_test(pTest, crc == 0xF0B8);
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}
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void testCRC8CreateTable(
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Test * pTest)
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{
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uint8_t crc = 0xff; /* accumulates the crc value */
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int i;
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(void) pTest;
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printf("static const uint8_t HeaderCRC[256] =\n");
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printf("{\n");
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printf(" ");
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for (i = 0; i < 256; i++) {
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crc = CRC_Calc_Header(i, 0);
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printf("0x%02x, ", crc);
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if (!((i + 1) % 8)) {
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printf("\n");
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if (i != 255) {
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printf(" ");
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}
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}
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}
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printf("};\n");
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}
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void testCRC16CreateTable(
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Test * pTest)
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{
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uint16_t crc;
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int i;
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(void) pTest;
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printf("static const uint16_t DataCRC[256] =\n");
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printf("{\n");
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printf(" ");
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for (i = 0; i < 256; i++) {
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crc = CRC_Calc_Data(i, 0);
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printf("0x%04x, ", crc);
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if (!((i + 1) % 8)) {
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printf("\n");
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if (i != 255) {
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printf(" ");
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}
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}
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}
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printf("};\n");
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}
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#endif
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#ifdef TEST_CRC
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int main(
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void)
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{
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Test *pTest;
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bool rc;
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pTest = ct_create("crc", NULL);
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/* individual tests */
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rc = ct_addTestFunction(pTest, testCRC8);
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assert(rc);
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rc = ct_addTestFunction(pTest, testCRC16);
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assert(rc);
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rc = ct_addTestFunction(pTest, testCRC8CreateTable);
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assert(rc);
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rc = ct_addTestFunction(pTest, testCRC16CreateTable);
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assert(rc);
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ct_setStream(pTest, stdout);
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ct_run(pTest);
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(void) ct_report(pTest);
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ct_destroy(pTest);
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return 0;
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}
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#endif
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