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[/] [or1k/] [trunk/] [insight/] [gdb/] [rdi-share/] [crc.h] - Blame information for rev 1765

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/*
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 * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
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 *
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 * This software may be freely used, copied, modified, and distributed
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 * provided that the above copyright notice is preserved in all copies of the
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 * software.
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 */
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/* -*-C-*-
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 *
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 * $Revision: 1.1.1.1 $
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 *     $Date: 2002-01-16 10:24:33 $
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 *
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 *
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 * crc.h - describes some "standard" CRC calculation routines.
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 */
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#ifndef angel_crc_h
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#define angel_crc_h
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/*
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 * manifests
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 */
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/*
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 * When using "crc32" or "crc16" these initial CRC values must be given to
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 * the respective function the first time it is called. The function can
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 * then be called with the return value from the last call of the function
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 * to generate a running CRC over multiple data blocks.
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 * When the last data block has been processed using the "crc32" algorithm
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 * the CRC value should be inverted to produce the final CRC value:
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 * e.g. CRC = ~CRC
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 */
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#define startCRC32  (0xFFFFFFFF)    /* CRC initialised to all 1s */
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#define startCRC16  (0x0000)        /* CRC initialised to all 0s */
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/*
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 * For the CRC-32 residual to be calculated correctly requires that the CRC
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 * value is in memory little-endian due to the byte read, bit-ordering
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 * nature of the algorithm.
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 */
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#define CRC32residual   (0xDEBB20E3)    /* good CRC-32 residual */
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/**********************************************************************/
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/*
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 * exported functions
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 */
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/*
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 *  Function: crc32
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 *   Purpose: Provides a table driven implementation of the IEEE-802.3
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 *            32-bit CRC algorithm for byte data.
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 *
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 *    Params:
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 *       Input: address     pointer to the byte data
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 *              size        number of bytes of data to be processed
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 *              crc         initial CRC value to be used (can be the output
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 *                          from a previous call to this function).
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 *   Returns:
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 *          OK: 32-bit CRC value for the specified data
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 */
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extern unsigned int crc32(unsigned char *address, unsigned int size,
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                          unsigned int crc);
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/**********************************************************************/
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/*
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 *
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 *  Function: crc16
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 *   Purpose: Generates a table driven 16-bit CRC-CCITT for byte data
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 *
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 *    Params:
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 *       Input: address     pointer to the byte data
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 *              size        number of bytes of data to be processed
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 *              crc         initial CRC value to be used (can be the output
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 *                          from a previous call to this function).
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 *
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 *   Returns:
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 *          OK: 16-bit CRC value for the specified data
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 */
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extern unsigned short crc16(unsigned char *address, unsigned int size,
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                            unsigned short crc);
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/**********************************************************************/
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#endif /* !defined(angel_crc_h) */
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/* EOF crc.h */

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