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