rt-thread/components/dfs/filesystems/jffs2/cyg/crc/crc.h

//==========================================================================
//
//      crc.h
//
//      Interface for the CRC algorithms.
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 2002, 2009 Free Software Foundation, Inc.                        
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
// Software Foundation; either version 2 or (at your option) any later      
// version.                                                                 
//
// eCos 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 General Public License    
// for more details.                                                        
//
// You should have received a copy of the GNU General Public License        
// along with eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
// -------------------------------------------                              
// ####ECOSGPLCOPYRIGHTEND####                                              
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    Andrew Lunn
// Contributors: Andrew Lunn
// Date:         2002-08-06
// Purpose:      
// Description:  
//              
// This code is part of eCos (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#ifndef _SERVICES_CRC_CRC_H_
#define _SERVICES_CRC_CRC_H_

#include <cyg/infra/cyg_type.h>

#ifndef __externC
# ifdef __cplusplus
#  define __externC extern "C"
# else
#  define __externC extern
# endif
#endif

// Compute a CRC, using the POSIX 1003 definition

__externC cyg_uint32 
cyg_posix_crc32(unsigned char *s, int len);

// Gary S. Brown's 32 bit CRC

__externC cyg_uint32 
cyg_crc32(unsigned char *s, int len);

// Gary S. Brown's 32 bit CRC, but accumulate the result from a
// previous CRC calculation

__externC cyg_uint32 
cyg_crc32_accumulate(cyg_uint32 crc, unsigned char *s, int len);

// Ethernet FCS Algorithm

__externC cyg_uint32 
cyg_ether_crc32(unsigned char *s, int len);

// Ethernet FCS algorithm, but accumulate the result from a previous
// CRC calculation.

__externC cyg_uint32 
cyg_ether_crc32_accumulate(cyg_uint32 crc, unsigned char *s, int len);

// 16 bit CRC with polynomial x^16+x^12+x^5+1

__externC cyg_uint16
cyg_crc16(unsigned char *s, int len);

__externC cyg_uint16
cyg_crc16_accumulate(cyg_uint16 crc, unsigned char *s, int len);

#endif // _SERVICES_CRC_CRC_H_