FreeBSD/Linux Kernel Cross Reference
sys/dev/nand/hamming.h

     /*      $NetBSD: hamming.h,v 1.1 2011/02/26 18:07:31 ahoka Exp $        */
     
     /*
      * Copyright (c) 2008, Atmel Corporation
      *
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are met:
     *
     * - Redistributions of source code must retain the above copyright notice,
     * this list of conditions and the disclaimer below.
     *
     * Atmel's name may not be used to endorse or promote products derived from
     * this software without specific prior written permission.
     *
     * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
     * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
     * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
     * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef HAMMING_H
    #define HAMMING_H
    
    #include "nand.h"
    
    /*-
     * These are the possible errors when trying to verify a block of data encoded
     * using a Hamming code:
     * 
     *  - HAMMING_ERROR_SINGLEBIT
     *  - HAMMING_ERROR_ECC
     *  - HAMMING_ERROR_MULTIPLEBITS
     */
    
    /* A single bit was incorrect but has been recovered. */
    #define HAMMING_ERROR_SINGLEBIT         NAND_ECC_CORRECTED
    
    /* The original code has been corrupted. */
    #define HAMMING_ERROR_ECC               NAND_ECC_INVALID
    
    /* Multiple bits are incorrect in the data and they cannot be corrected. */
    #define HAMMING_ERROR_MULTIPLEBITS      NAND_ECC_TWOBIT
    
    uint8_t hamming_correct_256(uint8_t *, const uint8_t *, const uint8_t *);
    void hamming_compute_256(const uint8_t *data, uint8_t *code);
    
    #endif /* HAMMING_H */
    

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