mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-24 10:35:12 +08:00
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
|
|
*
|
|
* This software may be freely used, copied, modified, and distributed
|
|
* provided that the above copyright notice is preserved in all copies of the
|
|
* software.
|
|
*/
|
|
|
|
/* -*-C-*-
|
|
*
|
|
* $Revision$
|
|
* $Date$
|
|
*
|
|
*
|
|
* crc.h - describes some "standard" CRC calculation routines.
|
|
*/
|
|
#ifndef angel_crc_h
|
|
#define angel_crc_h
|
|
|
|
/*
|
|
* manifests
|
|
*/
|
|
|
|
/*
|
|
* When using "crc32" or "crc16" these initial CRC values must be given to
|
|
* the respective function the first time it is called. The function can
|
|
* then be called with the return value from the last call of the function
|
|
* to generate a running CRC over multiple data blocks.
|
|
* When the last data block has been processed using the "crc32" algorithm
|
|
* the CRC value should be inverted to produce the final CRC value:
|
|
* e.g. CRC = ~CRC
|
|
*/
|
|
|
|
#define startCRC32 (0xFFFFFFFF) /* CRC initialised to all 1s */
|
|
#define startCRC16 (0x0000) /* CRC initialised to all 0s */
|
|
|
|
/*
|
|
* For the CRC-32 residual to be calculated correctly requires that the CRC
|
|
* value is in memory little-endian due to the byte read, bit-ordering
|
|
* nature of the algorithm.
|
|
*/
|
|
#define CRC32residual (0xDEBB20E3) /* good CRC-32 residual */
|
|
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* exported functions
|
|
*/
|
|
|
|
/*
|
|
* Function: crc32
|
|
* Purpose: Provides a table driven implementation of the IEEE-802.3
|
|
* 32-bit CRC algorithm for byte data.
|
|
*
|
|
* Params:
|
|
* Input: address pointer to the byte data
|
|
* size number of bytes of data to be processed
|
|
* crc initial CRC value to be used (can be the output
|
|
* from a previous call to this function).
|
|
* Returns:
|
|
* OK: 32-bit CRC value for the specified data
|
|
*/
|
|
extern unsigned int crc32(unsigned char *address, unsigned int size,
|
|
unsigned int crc);
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
*
|
|
* Function: crc16
|
|
* Purpose: Generates a table driven 16-bit CRC-CCITT for byte data
|
|
*
|
|
* Params:
|
|
* Input: address pointer to the byte data
|
|
* size number of bytes of data to be processed
|
|
* crc initial CRC value to be used (can be the output
|
|
* from a previous call to this function).
|
|
*
|
|
* Returns:
|
|
* OK: 16-bit CRC value for the specified data
|
|
*/
|
|
extern unsigned short crc16(unsigned char *address, unsigned int size,
|
|
unsigned short crc);
|
|
|
|
/**********************************************************************/
|
|
|
|
#endif /* !defined(angel_crc_h) */
|
|
|
|
/* EOF crc.h */
|