| 1 | /* $Id: crc16ccitt.cpp 69219 2017-10-24 15:01:30Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - CRC-16-CCITT.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2017 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/crc.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 |
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| 35 | /*********************************************************************************************************************************
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| 36 | * Internal Functions *
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| 37 | *********************************************************************************************************************************/
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| 38 | /**
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| 39 | * CRC-16-CCTII / CRC-CCTII / CRC 010041 table.
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| 40 | */
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| 41 | static uint16_t const g_au16Crc16Cctii[0x100] =
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| 42 | {
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| 43 | UINT16_C(0x0000), UINT16_C(0x1021), UINT16_C(0x2042), UINT16_C(0x3063), UINT16_C(0x4084), UINT16_C(0x50a5), UINT16_C(0x60c6), UINT16_C(0x70e7),
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| 44 | UINT16_C(0x8108), UINT16_C(0x9129), UINT16_C(0xa14a), UINT16_C(0xb16b), UINT16_C(0xc18c), UINT16_C(0xd1ad), UINT16_C(0xe1ce), UINT16_C(0xf1ef),
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| 45 | UINT16_C(0x1231), UINT16_C(0x0210), UINT16_C(0x3273), UINT16_C(0x2252), UINT16_C(0x52b5), UINT16_C(0x4294), UINT16_C(0x72f7), UINT16_C(0x62d6),
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| 46 | UINT16_C(0x9339), UINT16_C(0x8318), UINT16_C(0xb37b), UINT16_C(0xa35a), UINT16_C(0xd3bd), UINT16_C(0xc39c), UINT16_C(0xf3ff), UINT16_C(0xe3de),
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| 47 | UINT16_C(0x2462), UINT16_C(0x3443), UINT16_C(0x0420), UINT16_C(0x1401), UINT16_C(0x64e6), UINT16_C(0x74c7), UINT16_C(0x44a4), UINT16_C(0x5485),
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| 48 | UINT16_C(0xa56a), UINT16_C(0xb54b), UINT16_C(0x8528), UINT16_C(0x9509), UINT16_C(0xe5ee), UINT16_C(0xf5cf), UINT16_C(0xc5ac), UINT16_C(0xd58d),
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| 49 | UINT16_C(0x3653), UINT16_C(0x2672), UINT16_C(0x1611), UINT16_C(0x0630), UINT16_C(0x76d7), UINT16_C(0x66f6), UINT16_C(0x5695), UINT16_C(0x46b4),
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| 50 | UINT16_C(0xb75b), UINT16_C(0xa77a), UINT16_C(0x9719), UINT16_C(0x8738), UINT16_C(0xf7df), UINT16_C(0xe7fe), UINT16_C(0xd79d), UINT16_C(0xc7bc),
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| 51 | UINT16_C(0x48c4), UINT16_C(0x58e5), UINT16_C(0x6886), UINT16_C(0x78a7), UINT16_C(0x0840), UINT16_C(0x1861), UINT16_C(0x2802), UINT16_C(0x3823),
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| 52 | UINT16_C(0xc9cc), UINT16_C(0xd9ed), UINT16_C(0xe98e), UINT16_C(0xf9af), UINT16_C(0x8948), UINT16_C(0x9969), UINT16_C(0xa90a), UINT16_C(0xb92b),
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| 53 | UINT16_C(0x5af5), UINT16_C(0x4ad4), UINT16_C(0x7ab7), UINT16_C(0x6a96), UINT16_C(0x1a71), UINT16_C(0x0a50), UINT16_C(0x3a33), UINT16_C(0x2a12),
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| 54 | UINT16_C(0xdbfd), UINT16_C(0xcbdc), UINT16_C(0xfbbf), UINT16_C(0xeb9e), UINT16_C(0x9b79), UINT16_C(0x8b58), UINT16_C(0xbb3b), UINT16_C(0xab1a),
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| 55 | UINT16_C(0x6ca6), UINT16_C(0x7c87), UINT16_C(0x4ce4), UINT16_C(0x5cc5), UINT16_C(0x2c22), UINT16_C(0x3c03), UINT16_C(0x0c60), UINT16_C(0x1c41),
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| 56 | UINT16_C(0xedae), UINT16_C(0xfd8f), UINT16_C(0xcdec), UINT16_C(0xddcd), UINT16_C(0xad2a), UINT16_C(0xbd0b), UINT16_C(0x8d68), UINT16_C(0x9d49),
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| 57 | UINT16_C(0x7e97), UINT16_C(0x6eb6), UINT16_C(0x5ed5), UINT16_C(0x4ef4), UINT16_C(0x3e13), UINT16_C(0x2e32), UINT16_C(0x1e51), UINT16_C(0x0e70),
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| 58 | UINT16_C(0xff9f), UINT16_C(0xefbe), UINT16_C(0xdfdd), UINT16_C(0xcffc), UINT16_C(0xbf1b), UINT16_C(0xaf3a), UINT16_C(0x9f59), UINT16_C(0x8f78),
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| 59 | UINT16_C(0x9188), UINT16_C(0x81a9), UINT16_C(0xb1ca), UINT16_C(0xa1eb), UINT16_C(0xd10c), UINT16_C(0xc12d), UINT16_C(0xf14e), UINT16_C(0xe16f),
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| 60 | UINT16_C(0x1080), UINT16_C(0x00a1), UINT16_C(0x30c2), UINT16_C(0x20e3), UINT16_C(0x5004), UINT16_C(0x4025), UINT16_C(0x7046), UINT16_C(0x6067),
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| 61 | UINT16_C(0x83b9), UINT16_C(0x9398), UINT16_C(0xa3fb), UINT16_C(0xb3da), UINT16_C(0xc33d), UINT16_C(0xd31c), UINT16_C(0xe37f), UINT16_C(0xf35e),
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| 62 | UINT16_C(0x02b1), UINT16_C(0x1290), UINT16_C(0x22f3), UINT16_C(0x32d2), UINT16_C(0x4235), UINT16_C(0x5214), UINT16_C(0x6277), UINT16_C(0x7256),
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| 63 | UINT16_C(0xb5ea), UINT16_C(0xa5cb), UINT16_C(0x95a8), UINT16_C(0x8589), UINT16_C(0xf56e), UINT16_C(0xe54f), UINT16_C(0xd52c), UINT16_C(0xc50d),
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| 64 | UINT16_C(0x34e2), UINT16_C(0x24c3), UINT16_C(0x14a0), UINT16_C(0x0481), UINT16_C(0x7466), UINT16_C(0x6447), UINT16_C(0x5424), UINT16_C(0x4405),
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| 65 | UINT16_C(0xa7db), UINT16_C(0xb7fa), UINT16_C(0x8799), UINT16_C(0x97b8), UINT16_C(0xe75f), UINT16_C(0xf77e), UINT16_C(0xc71d), UINT16_C(0xd73c),
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| 66 | UINT16_C(0x26d3), UINT16_C(0x36f2), UINT16_C(0x0691), UINT16_C(0x16b0), UINT16_C(0x6657), UINT16_C(0x7676), UINT16_C(0x4615), UINT16_C(0x5634),
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| 67 | UINT16_C(0xd94c), UINT16_C(0xc96d), UINT16_C(0xf90e), UINT16_C(0xe92f), UINT16_C(0x99c8), UINT16_C(0x89e9), UINT16_C(0xb98a), UINT16_C(0xa9ab),
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| 68 | UINT16_C(0x5844), UINT16_C(0x4865), UINT16_C(0x7806), UINT16_C(0x6827), UINT16_C(0x18c0), UINT16_C(0x08e1), UINT16_C(0x3882), UINT16_C(0x28a3),
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| 69 | UINT16_C(0xcb7d), UINT16_C(0xdb5c), UINT16_C(0xeb3f), UINT16_C(0xfb1e), UINT16_C(0x8bf9), UINT16_C(0x9bd8), UINT16_C(0xabbb), UINT16_C(0xbb9a),
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| 70 | UINT16_C(0x4a75), UINT16_C(0x5a54), UINT16_C(0x6a37), UINT16_C(0x7a16), UINT16_C(0x0af1), UINT16_C(0x1ad0), UINT16_C(0x2ab3), UINT16_C(0x3a92),
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| 71 | UINT16_C(0xfd2e), UINT16_C(0xed0f), UINT16_C(0xdd6c), UINT16_C(0xcd4d), UINT16_C(0xbdaa), UINT16_C(0xad8b), UINT16_C(0x9de8), UINT16_C(0x8dc9),
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| 72 | UINT16_C(0x7c26), UINT16_C(0x6c07), UINT16_C(0x5c64), UINT16_C(0x4c45), UINT16_C(0x3ca2), UINT16_C(0x2c83), UINT16_C(0x1ce0), UINT16_C(0x0cc1),
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| 73 | UINT16_C(0xef1f), UINT16_C(0xff3e), UINT16_C(0xcf5d), UINT16_C(0xdf7c), UINT16_C(0xaf9b), UINT16_C(0xbfba), UINT16_C(0x8fd9), UINT16_C(0x9ff8),
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| 74 | UINT16_C(0x6e17), UINT16_C(0x7e36), UINT16_C(0x4e55), UINT16_C(0x5e74), UINT16_C(0x2e93), UINT16_C(0x3eb2), UINT16_C(0x0ed1), UINT16_C(0x1ef0),
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| 75 | };
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| 76 |
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| 77 |
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| 78 |
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| 79 | RTDECL(uint16_t) RTCrc16Ccitt(const void *pv, size_t cb)
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| 80 | {
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| 81 | uint16_t uCrc = 0;
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| 82 | const uint8_t *pb = (const uint8_t *)pv;
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| 83 | while (cb-- > 0)
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| 84 | uCrc = g_au16Crc16Cctii[(uint8_t)(uCrc >> 8) ^ *pb++] ^ (uCrc << 8);
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| 85 | return uCrc;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | RTDECL(uint16_t) RTCrc16CcittStart(void)
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| 90 | {
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| 91 | return 0;
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| 92 | }
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| 93 |
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| 94 |
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| 95 | RTDECL(uint16_t) RTCrc16CcittProcess(uint16_t uCrc, const void *pv, size_t cb)
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| 96 | {
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| 97 | const uint8_t *pb = (const uint8_t *)pv;
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| 98 | while (cb-- > 0)
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| 99 | uCrc = g_au16Crc16Cctii[(uint8_t)(uCrc >> 8) ^ *pb++] ^ (uCrc << 8);
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| 100 | return uCrc;
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| 101 | }
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| 102 |
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| 103 |
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| 104 | RTDECL(uint16_t) RTCrc16CcittFinish(uint16_t uCrc)
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| 105 | {
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| 106 | return uCrc;
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| 107 | }
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| 108 |
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