1 //========================================================================== 2 // 3 // crc.h 4 // 5 // Interface for the CRC algorithms. 6 // 7 //========================================================================== 8 // ####ECOSGPLCOPYRIGHTBEGIN#### 9 // ------------------------------------------- 10 // This file is part of eCos, the Embedded Configurable Operating System. 11 // Copyright (C) 2002, 2009 Free Software Foundation, Inc. 12 // 13 // eCos is free software; you can redistribute it and/or modify it under 14 // the terms of the GNU General Public License as published by the Free 15 // Software Foundation; either version 2 or (at your option) any later 16 // version. 17 // 18 // eCos is distributed in the hope that it will be useful, but WITHOUT 19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 21 // for more details. 22 // 23 // You should have received a copy of the GNU General Public License 24 // along with eCos; if not, write to the Free Software Foundation, Inc., 25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 26 // 27 // As a special exception, if other files instantiate templates or use 28 // macros or inline functions from this file, or you compile this file 29 // and link it with other works to produce a work based on this file, 30 // this file does not by itself cause the resulting work to be covered by 31 // the GNU General Public License. However the source code for this file 32 // must still be made available in accordance with section (3) of the GNU 33 // General Public License v2. 34 // 35 // This exception does not invalidate any other reasons why a work based 36 // on this file might be covered by the GNU General Public License. 37 // ------------------------------------------- 38 // ####ECOSGPLCOPYRIGHTEND#### 39 //========================================================================== 40 //#####DESCRIPTIONBEGIN#### 41 // 42 // Author(s): Andrew Lunn 43 // Contributors: Andrew Lunn 44 // Date: 2002-08-06 45 // Purpose: 46 // Description: 47 // 48 // This code is part of eCos (tm). 49 // 50 //####DESCRIPTIONEND#### 51 // 52 //========================================================================== 53 54 #ifndef _SERVICES_CRC_CRC_H_ 55 #define _SERVICES_CRC_CRC_H_ 56 57 #include <cyg/infra/cyg_type.h> 58 59 #ifndef __externC 60 # ifdef __cplusplus 61 # define __externC extern "C" 62 # else 63 # define __externC extern 64 # endif 65 #endif 66 67 // Compute a CRC, using the POSIX 1003 definition 68 69 __externC cyg_uint32 70 cyg_posix_crc32(unsigned char *s, int len); 71 72 // Gary S. Brown's 32 bit CRC 73 74 __externC cyg_uint32 75 cyg_crc32(unsigned char *s, int len); 76 77 // Gary S. Brown's 32 bit CRC, but accumulate the result from a 78 // previous CRC calculation 79 80 __externC cyg_uint32 81 cyg_crc32_accumulate(cyg_uint32 crc, unsigned char *s, int len); 82 83 // Ethernet FCS Algorithm 84 85 __externC cyg_uint32 86 cyg_ether_crc32(unsigned char *s, int len); 87 88 // Ethernet FCS algorithm, but accumulate the result from a previous 89 // CRC calculation. 90 91 __externC cyg_uint32 92 cyg_ether_crc32_accumulate(cyg_uint32 crc, unsigned char *s, int len); 93 94 // 16 bit CRC with polynomial x^16+x^12+x^5+1 95 96 __externC cyg_uint16 97 cyg_crc16(unsigned char *s, int len); 98 99 __externC cyg_uint16 100 cyg_crc16_accumulate(cyg_uint16 crc, unsigned char *s, int len); 101 102 #endif // _SERVICES_CRC_CRC_H_ 103 104 105 106