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/*
* Copyright (C) 2015 Lucas Jenß
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup sys_ecc
* @brief
* @{
*
* @brief Hamming Code implementation for 256byte data segments
* @author Lucas Jenß <lucas@x3ro.de>
*/
#ifndef _HAMMING256_H
#define _HAMMING256_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/** No bit errors were detected in the message */
#define Hamming_ERROR_NONE 0
/** A single bit was incorrect but has been recovered. */
#define Hamming_ERROR_SINGLEBIT 1
/** The original code has been corrupted. */
#define Hamming_ERROR_ECC 2
/** Multiple bits are incorrect in the data and they cannot be corrected. */
#define Hamming_ERROR_MULTIPLEBITS 3
/**
* @brief Computes 3-bytes hamming codes for a data block whose size is multiple of
* 256 bytes. Each 256 bytes block gets its own code.
*
* @param[in] data Data to compute code for.
* @param[in] size Data size in bytes.
* @param[out] code Codes buffer.
*/
void hamming_compute256x( const uint8_t *data, uint32_t size, uint8_t *code );
/**
* @brief Verifies 3-bytes hamming codes for a data block whose size is multiple of
* 256 bytes. Each 256-bytes block is verified with its own code.
*
* @return Hamming_ERROR_NONE if the data is correct, Hamming_ERROR_SINGLEBIT if one or more
* block(s) have had a single bit corrected, or either Hamming_ERROR_ECC
* or Hamming_ERROR_MULTIPLEBITS.
*
* @param[in] data Data buffer to verify.
* @param[in] size Size of the data in bytes.
* @param[in] code Original codes.
*/
uint8_t hamming_verify256x( uint8_t *data, uint32_t size, const uint8_t *code );
#ifdef __cplusplus
}
#endif
#endif
/** @} */
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