/* * YAFFS: Yet another FFS. A NAND-flash specific file system.  * * yaffs_ecc.c: ECC generation/correction algorithms. * * Copyright (C) 2002 Aleph One Ltd. * * Created by Charles Manning <charles@aleph1.co.uk> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */  /* * This code implements the ECC algorithm used in SmartMedia. * * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.  * The two unused bit are set to 1. * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC  * blocks are used on a 512-byte NAND page. * */#ifndef __YAFFS_ECC_H__#define __YAFFS_ECC_H__void yaffs_ECCCalculate(const unsigned char *data,unsigned char *ecc);int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc, const unsigned char *test_ecc);#endif