mirror of https://github.com/status-im/leopard.git
255 lines
9.0 KiB
C
255 lines
9.0 KiB
C
/*
|
|
Copyright (c) 2017 Christopher A. Taylor. 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 following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
* Neither the name of Leopard-RS nor the names of its contributors may be
|
|
used to endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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 CAT_LEOPARD_RS_H
|
|
#define CAT_LEOPARD_RS_H
|
|
|
|
/*
|
|
Leopard-RS
|
|
MDS Reed-Solomon Erasure Correction Codes for Large Data in C
|
|
|
|
Algorithms are described in LeopardCommon.h
|
|
|
|
|
|
Inspired by discussion with:
|
|
|
|
Sian-Jhen Lin <sjhenglin@gmail.com> : Author of {1} {3}, basis for Leopard
|
|
Bulat Ziganshin <bulat.ziganshin@gmail.com> : Author of FastECC
|
|
Yutaka Sawada <tenfon@outlook.jp> : Author of MultiPar
|
|
|
|
|
|
References:
|
|
|
|
{1} S.-J. Lin, T. Y. Al-Naffouri, Y. S. Han, and W.-H. Chung,
|
|
"Novel Polynomial Basis with Fast Fourier Transform
|
|
and Its Application to Reed-Solomon Erasure Codes"
|
|
IEEE Trans. on Information Theory, pp. 6284-6299, November, 2016.
|
|
|
|
{2} D. G. Cantor, "On arithmetical algorithms over finite fields",
|
|
Journal of Combinatorial Theory, Series A, vol. 50, no. 2, pp. 285-300, 1989.
|
|
|
|
{3} Sian-Jheng Lin, Wei-Ho Chung, "An Efficient (n, k) Information
|
|
Dispersal Algorithm for High Code Rate System over Fermat Fields,"
|
|
IEEE Commun. Lett., vol.16, no.12, pp. 2036-2039, Dec. 2012.
|
|
|
|
{4} Plank, J. S., Greenan, K. M., Miller, E. L., "Screaming fast Galois Field
|
|
arithmetic using Intel SIMD instructions." In: FAST-2013: 11th Usenix
|
|
Conference on File and Storage Technologies, San Jose, 2013
|
|
*/
|
|
|
|
// Library version
|
|
#define LEO_VERSION 1
|
|
|
|
// Tweak if the functions are exported or statically linked
|
|
//#define LEO_DLL /* Defined when building/linking as DLL */
|
|
//#define LEO_BUILDING /* Defined by the library makefile */
|
|
|
|
#if defined(LEO_BUILDING)
|
|
# if defined(LEO_DLL)
|
|
#define LEO_EXPORT __declspec(dllexport)
|
|
# else
|
|
#define LEO_EXPORT
|
|
# endif
|
|
#else
|
|
# if defined(LEO_DLL)
|
|
#define LEO_EXPORT __declspec(dllimport)
|
|
# else
|
|
#define LEO_EXPORT extern
|
|
# endif
|
|
#endif
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Initialization API
|
|
|
|
/*
|
|
leo_init()
|
|
|
|
Perform static initialization for the library, verifying that the platform
|
|
is supported.
|
|
|
|
Returns 0 on success and other values on failure.
|
|
*/
|
|
|
|
LEO_EXPORT int leo_init_(int version);
|
|
#define leo_init() leo_init_(LEO_VERSION)
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Shared Constants / Datatypes
|
|
|
|
// Results
|
|
typedef enum LeopardResultT
|
|
{
|
|
Leopard_Success = 0, // Operation succeeded
|
|
|
|
Leopard_NeedMoreData = -1, // Not enough recovery data received
|
|
Leopard_TooMuchData = -2, // Buffer counts are too high
|
|
Leopard_InvalidSize = -3, // Buffer size must be a multiple of 64 bytes
|
|
Leopard_InvalidCounts = -4, // Invalid counts provided
|
|
Leopard_InvalidInput = -5, // A function parameter was invalid
|
|
Leopard_Platform = -6, // Platform is unsupported
|
|
Leopard_CallInitialize = -7, // Call leo_init() first
|
|
} LeopardResult;
|
|
|
|
// Convert Leopard result to string
|
|
LEO_EXPORT const char* leo_result_string(LeopardResult result);
|
|
|
|
// Flags
|
|
typedef enum LeopardFlagsT
|
|
{
|
|
LeopardFlags_Defaults = 0, // Default settings
|
|
|
|
LeopardFlags_Multithreaded = 1, // Enable multiple threads
|
|
} LeopardFlags;
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Encoder API
|
|
|
|
/*
|
|
leo_encode_work_count()
|
|
|
|
Calculate the number of work_data buffers to provide to leo_encode().
|
|
|
|
The sum of original_count + recovery_count must not exceed 65536.
|
|
|
|
Returns the work_count value to pass into leo_encode().
|
|
Returns 0 on invalid input.
|
|
*/
|
|
LEO_EXPORT unsigned leo_encode_work_count(
|
|
unsigned original_count,
|
|
unsigned recovery_count);
|
|
|
|
/*
|
|
leo_encode()
|
|
|
|
Generate recovery data.
|
|
|
|
original_count: Number of original_data[] buffers provided.
|
|
recovery_count: Number of desired recovery data buffers.
|
|
buffer_bytes: Number of bytes in each data buffer.
|
|
original_data: Array of pointers to original data buffers.
|
|
work_count: Number of work_data[] buffers, from leo_encode_work_count().
|
|
work_data: Array of pointers to work data buffers.
|
|
flags: Flags for encoding e.g. LeopardFlag_Multithreaded
|
|
|
|
The sum of original_count + recovery_count must not exceed 65536.
|
|
The recovery_count <= original_count.
|
|
|
|
The buffer_bytes must be a multiple of 64.
|
|
Each buffer should have the same number of bytes.
|
|
Even the last piece must be rounded up to the block size.
|
|
|
|
Let buffer_bytes = The number of bytes in each buffer:
|
|
|
|
original_count = static_cast<unsigned>(
|
|
((uint64_t)total_bytes + buffer_bytes - 1) / buffer_bytes);
|
|
|
|
Or if the number of pieces is known:
|
|
|
|
buffer_bytes = static_cast<unsigned>(
|
|
((uint64_t)total_bytes + original_count - 1) / original_count);
|
|
|
|
Returns Leopard_Success on success.
|
|
* The first set of recovery_count buffers in work_data will be the result.
|
|
Returns other values on errors.
|
|
*/
|
|
LEO_EXPORT LeopardResult leo_encode(
|
|
uint64_t buffer_bytes, // Number of bytes in each data buffer
|
|
unsigned original_count, // Number of original_data[] buffer pointers
|
|
unsigned recovery_count, // Number of recovery_data[] buffer pointers
|
|
unsigned work_count, // Number of work_data[] buffer pointers, from leo_encode_work_count()
|
|
const void* const * const original_data, // Array of pointers to original data buffers
|
|
void** work_data, // Array of work buffers
|
|
unsigned flags); // Operation flags
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Decoder API
|
|
|
|
/*
|
|
leo_decode_work_count()
|
|
|
|
Calculate the number of work_data buffers to provide to leo_decode().
|
|
|
|
The sum of original_count + recovery_count must not exceed 65536.
|
|
|
|
Returns the work_count value to pass into leo_encode().
|
|
Returns 0 on invalid input.
|
|
*/
|
|
LEO_EXPORT unsigned leo_decode_work_count(
|
|
unsigned original_count,
|
|
unsigned recovery_count);
|
|
|
|
/*
|
|
leo_decode()
|
|
|
|
Decode original data from recovery data.
|
|
|
|
buffer_bytes: Number of bytes in each data buffer.
|
|
original_count: Number of original_data[] buffers provided.
|
|
original_data: Array of pointers to original data buffers.
|
|
recovery_count: Number of recovery_data[] buffers provided.
|
|
recovery_data: Array of pointers to recovery data buffers.
|
|
work_count: Number of work_data[] buffers, from leo_decode_work_count().
|
|
work_data: Array of pointers to recovery data buffers.
|
|
flags: Flags for encoding e.g. LeopardFlag_Multithreaded
|
|
|
|
Lost original/recovery data should be set to NULL.
|
|
|
|
The sum of recovery_count + the number of non-NULL original data must be at
|
|
least original_count in order to perform recovery.
|
|
|
|
Returns Leopard_Success on success.
|
|
Returns other values on errors.
|
|
*/
|
|
LEO_EXPORT LeopardResult leo_decode(
|
|
uint64_t buffer_bytes, // Number of bytes in each data buffer
|
|
unsigned original_count, // Number of original_data[] buffer pointers
|
|
unsigned recovery_count, // Number of recovery_data[] buffer pointers
|
|
unsigned work_count, // Number of buffer pointers in work_data[]
|
|
const void* const * const original_data, // Array of original data buffers
|
|
const void* const * const recovery_data, // Array of recovery data buffers
|
|
void** work_data, // Array of work data buffers
|
|
unsigned flags); // Operation flags
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif // CAT_LEOPARD_RS_H
|