140 lines
5.0 KiB
C
140 lines
5.0 KiB
C
/****************************************************************************
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* include/nuttx/mtd/hamming.h
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*
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* Copyright (c) 2011, Atmel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the names NuttX nor Atmel nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_MTD_HAMMING_H
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#define __INCLUDE_NUTTX_MTD_HAMMING_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* These are the possible errors when trying to verify a block of data
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* encoded using a Hamming code:
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*
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* HAMMING_SUCCESS - Block verified without errors
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* HAMMING_ERROR_SINGLEBIT - A single bit was incorrect but has been
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* recovered
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* HAMMING_ERROR_ECC - The original code has been corrupted
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* HAMMING_ERROR_MULTIPLEBITS - Multiple bits are incorrect in the data
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* and they cannot be corrected
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*/
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#define HAMMING_SUCCESS 0
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#define HAMMING_ERROR_SINGLEBIT 1
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#define HAMMING_ERROR_ECC 2
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#define HAMMING_ERROR_MULTIPLEBITS 3
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: hamming_compute256x
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*
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* Description:
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* Computes 3-bytes hamming codes for a data block whose size is multiple
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* of 256 bytes. Each 256 bytes block gets its own code.
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*
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* Input Parameters:
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* data - Data to compute code for
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* size - Data size in bytes
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* code - Codes buffer
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void hamming_compute256x(FAR const uint8_t *data,
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size_t size,
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FAR uint8_t *code);
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/****************************************************************************
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* Name: hamming_verify256x
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*
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* Description:
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* Verifies 3-bytes hamming codes for a data block whose size is multiple
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* of 256 bytes. Each 256-bytes block is verified with its own code.
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*
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* Input Parameters:
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* data - Data buffer to verify
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* size - Size of the data in bytes
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* code - Original codes
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*
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* Returned Value:
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* Return 0 if the data is correct, HAMMING_ERROR_SINGLEBIT if one or more
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* block(s) have had a single bit corrected, or either HAMMING_ERROR_ECC
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* or HAMMING_ERROR_MULTIPLEBITS.
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*
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****************************************************************************/
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int hamming_verify256x(FAR uint8_t *data,
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size_t size,
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FAR const uint8_t *code);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __INCLUDE_NUTTX_MTD_HAMMING_H */
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