mirror of
https://github.com/minio/minio.git
synced 2024-12-26 23:25:54 -05:00
934 lines
37 KiB
C
934 lines
37 KiB
C
|
/**********************************************************************
|
||
|
|
Copyright(c) 2011-2015 Intel 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 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 Intel Corporation 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
|
||
|
|
OWNER 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 _ERASURE_CODE_H_
|
||
|
|
#define _ERASURE_CODE_H_
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file erasure_code.h
|
||
|
|
* @brief Interface to functions supporting erasure code encode and decode.
|
||
|
|
*
|
||
|
|
* This file defines the interface to optimized functions used in erasure
|
||
|
|
* codes. Encode and decode of erasures in GF(2^8) are made by calculating the
|
||
|
|
* dot product of the symbols (bytes in GF(2^8)) across a set of buffers and a
|
||
|
|
* set of coefficients. Values for the coefficients are determined by the type
|
||
|
|
* of erasure code. Using a general dot product means that any sequence of
|
||
|
|
* coefficients may be used including erasure codes based on random
|
||
|
|
* coefficients.
|
||
|
|
* Multiple versions of dot product are supplied to calculate 1-6 output
|
||
|
|
* vectors in one pass.
|
||
|
|
* Base GF multiply and divide functions can be sped up by defining
|
||
|
|
* GF_LARGE_TABLES at the expense of memory size.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "gf_vect_mul.h"
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Initialize tables for fast Erasure Code encode and decode.
|
||
|
|
*
|
||
|
|
* Generates the expanded tables needed for fast encode or decode for erasure
|
||
|
|
* codes on blocks of data. 32bytes is generated for each input coefficient.
|
||
|
|
*
|
||
|
|
* @param k The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param rows The number of output vectors to concurrently encode/decode.
|
||
|
|
* @param a Pointer to sets of arrays of input coefficients used to encode
|
||
|
|
* or decode data.
|
||
|
|
* @param gftbls Pointer to start of space for concatenated output tables
|
||
|
|
* generated from input coefficients. Must be of size 32*k*rows.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_init_tables(int k, int rows, unsigned char* a, unsigned char* gftbls);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate or decode erasure codes on blocks of data, runs appropriate version.
|
||
|
|
*
|
||
|
|
* Given a list of source data blocks, generate one or multiple blocks of
|
||
|
|
* encoded data as specified by a matrix of GF(2^8) coefficients. When given a
|
||
|
|
* suitable set of coefficients, this function will perform the fast generation
|
||
|
|
* or decoding of Reed-Solomon type erasure codes.
|
||
|
|
*
|
||
|
|
* This function determines what instruction sets are enabled and
|
||
|
|
* selects the appropriate version at runtime.
|
||
|
|
*
|
||
|
|
* @param len Length of each block of data (vector) of source or dest data.
|
||
|
|
* @param k The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param rows The number of output vectors to concurrently encode/decode.
|
||
|
|
* @param gftbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*k*rows
|
||
|
|
* @param data Array of pointers to source input buffers.
|
||
|
|
* @param coding Array of pointers to coded output buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_encode_data(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
|
||
|
|
unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate or decode erasure codes on blocks of data.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data() with same parameters.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*/
|
||
|
|
void ec_encode_data_sse(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
|
||
|
|
unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate or decode erasure codes on blocks of data.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data() with same parameters.
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void ec_encode_data_avx(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
|
||
|
|
unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate or decode erasure codes on blocks of data.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data() with same parameters.
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void ec_encode_data_avx2(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
|
||
|
|
unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate or decode erasure codes on blocks of data, runs baseline version.
|
||
|
|
*
|
||
|
|
* Baseline version of ec_encode_data() with same parameters.
|
||
|
|
*/
|
||
|
|
void ec_encode_data_base(int len, int srcs, int dests, unsigned char *v, unsigned char **src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate update for encode or decode of erasure codes from single source, runs appropriate version.
|
||
|
|
*
|
||
|
|
* Given one source data block, update one or multiple blocks of encoded data as
|
||
|
|
* specified by a matrix of GF(2^8) coefficients. When given a suitable set of
|
||
|
|
* coefficients, this function will perform the fast generation or decoding of
|
||
|
|
* Reed-Solomon type erasure codes from one input source at a time.
|
||
|
|
*
|
||
|
|
* This function determines what instruction sets are enabled and selects the
|
||
|
|
* appropriate version at runtime.
|
||
|
|
*
|
||
|
|
* @param len Length of each block of data (vector) of source or dest data.
|
||
|
|
* @param k The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param rows The number of output vectors to concurrently encode/decode.
|
||
|
|
* @param vec_i The vector index corresponding to the single input source.
|
||
|
|
* @param g_tbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*k*rows
|
||
|
|
* @param data Pointer to single input source used to update output parity.
|
||
|
|
* @param coding Array of pointers to coded output buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
void ec_encode_data_update(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
|
||
|
|
unsigned char *data, unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate update for encode or decode of erasure codes from single source.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data_update() with same parameters.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_encode_data_update_sse(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
|
||
|
|
unsigned char *data, unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate update for encode or decode of erasure codes from single source.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data_update() with same parameters.
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_encode_data_update_avx(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
|
||
|
|
unsigned char *data, unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate update for encode or decode of erasure codes from single source.
|
||
|
|
*
|
||
|
|
* Arch specific version of ec_encode_data_update() with same parameters.
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_encode_data_update_avx2(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
|
||
|
|
unsigned char *data, unsigned char **coding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate update for encode or decode of erasure codes from single source.
|
||
|
|
*
|
||
|
|
* Baseline version of ec_encode_data_update().
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ec_encode_data_update_base(int len, int k, int rows, int vec_i, unsigned char *v,
|
||
|
|
unsigned char *data, unsigned char **dest);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) dot product across each byte of the input array and a constant
|
||
|
|
* set of coefficients to produce each byte of the output. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 32*vlen byte constant array based on the input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
|
||
|
|
* on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) dot product across each byte of the input array and a constant
|
||
|
|
* set of coefficients to produce each byte of the output. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 32*vlen byte constant array based on the input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
|
||
|
|
* on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) dot product across each byte of the input array and a constant
|
||
|
|
* set of coefficients to produce each byte of the output. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 32*vlen byte constant array based on the input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
|
||
|
|
* on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with two outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate two ouputs at a time. Does two
|
||
|
|
* GF(2^8) dot products across each byte of the input array and two constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 2*32*vlen byte constant array based on the two sets of input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 2*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_2vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with two outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate two ouputs at a time. Does two
|
||
|
|
* GF(2^8) dot products across each byte of the input array and two constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 2*32*vlen byte constant array based on the two sets of input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 2*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_2vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with two outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate two ouputs at a time. Does two
|
||
|
|
* GF(2^8) dot products across each byte of the input array and two constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 2*32*vlen byte constant array based on the two sets of input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 2*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_2vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with three outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate three ouputs at a time. Does three
|
||
|
|
* GF(2^8) dot products across each byte of the input array and three constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 3*32*vlen byte constant array based on the three sets of input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 3*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_3vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with three outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate three ouputs at a time. Does three
|
||
|
|
* GF(2^8) dot products across each byte of the input array and three constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 3*32*vlen byte constant array based on the three sets of input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 3*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_3vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with three outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate three ouputs at a time. Does three
|
||
|
|
* GF(2^8) dot products across each byte of the input array and three constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 3*32*vlen byte constant array based on the three sets of input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 3*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_3vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with four outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate four ouputs at a time. Does four
|
||
|
|
* GF(2^8) dot products across each byte of the input array and four constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 4*32*vlen byte constant array based on the four sets of input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 4*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_4vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with four outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate four ouputs at a time. Does four
|
||
|
|
* GF(2^8) dot products across each byte of the input array and four constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 4*32*vlen byte constant array based on the four sets of input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 4*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_4vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with four outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate four ouputs at a time. Does four
|
||
|
|
* GF(2^8) dot products across each byte of the input array and four constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 4*32*vlen byte constant array based on the four sets of input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 4*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_4vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with five outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate five ouputs at a time. Does five
|
||
|
|
* GF(2^8) dot products across each byte of the input array and five constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 5*32*vlen byte constant array based on the five sets of input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 5*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_5vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with five outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate five ouputs at a time. Does five
|
||
|
|
* GF(2^8) dot products across each byte of the input array and five constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 5*32*vlen byte constant array based on the five sets of input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 5*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_5vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with five outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate five ouputs at a time. Does five
|
||
|
|
* GF(2^8) dot products across each byte of the input array and five constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 5*32*vlen byte constant array based on the five sets of input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 5*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_5vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with six outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate six ouputs at a time. Does six
|
||
|
|
* GF(2^8) dot products across each byte of the input array and six constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 6*32*vlen byte constant array based on the six sets of input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 6*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_6vect_dot_prod_sse(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with six outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate six ouputs at a time. Does six
|
||
|
|
* GF(2^8) dot products across each byte of the input array and six constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 6*32*vlen byte constant array based on the six sets of input coefficients.
|
||
|
|
* @requires AVX
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 6*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_6vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product with six outputs.
|
||
|
|
*
|
||
|
|
* Vector dot product optimized to calculate six ouputs at a time. Does six
|
||
|
|
* GF(2^8) dot products across each byte of the input array and six constant
|
||
|
|
* sets of coefficients to produce each byte of the outputs. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 6*32*vlen byte constant array based on the six sets of input coefficients.
|
||
|
|
* @requires AVX2
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 6*32*vlen byte array of pre-calculated constants
|
||
|
|
* based on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Array of pointers to destination data buffers.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_6vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product, runs baseline version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) dot product across each byte of the input array and a constant
|
||
|
|
* set of coefficients to produce each byte of the output. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 32*vlen byte constant array based on the input coefficients.
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 16.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
|
||
|
|
* on the array of input coefficients. Only elements 32*CONST*j + 1
|
||
|
|
* of this array are used, where j = (0, 1, 2...) and CONST is the
|
||
|
|
* number of elements in the array of input coefficients. The
|
||
|
|
* elements used correspond to the original input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_dot_prod_base(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector dot product, runs appropriate version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) dot product across each byte of the input array and a constant
|
||
|
|
* set of coefficients to produce each byte of the output. Can be used for
|
||
|
|
* erasure coding encode and decode. Function requires pre-calculation of a
|
||
|
|
* 32*vlen byte constant array based on the input coefficients.
|
||
|
|
*
|
||
|
|
* This function determines what instruction sets are enabled and
|
||
|
|
* selects the appropriate version at runtime.
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vlen Number of vector sources.
|
||
|
|
* @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
|
||
|
|
* on the array of input coefficients.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_dot_prod(int len, int vlen, unsigned char *gftbls,
|
||
|
|
unsigned char **src, unsigned char *dest);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply accumulate, runs appropriate version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) multiply across each byte of input source with expanded
|
||
|
|
* constant and add to destination array. Can be used for erasure coding encode
|
||
|
|
* and decode update when only one source is available at a time. Function
|
||
|
|
* requires pre-calculation of a 32*vec byte constant array based on the input
|
||
|
|
* coefficients.
|
||
|
|
*
|
||
|
|
* This function determines what instruction sets are enabled and selects the
|
||
|
|
* appropriate version at runtime.
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vec The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param vec_i The vector index corresponding to the single input source.
|
||
|
|
* @param gftbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*vec.
|
||
|
|
* @param src Array of pointers to source inputs.
|
||
|
|
* @param dest Pointer to destination data array.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_mad(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply accumulate, arch specific version.
|
||
|
|
*
|
||
|
|
* Arch specific version of gf_vect_mad() with same parameters.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char *dest);
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply accumulate, arch specific version.
|
||
|
|
*
|
||
|
|
* Arch specific version of gf_vect_mad() with same parameters.
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply accumulate, arch specific version.
|
||
|
|
*
|
||
|
|
* Arch specific version of gf_vect_mad() with same parameters.
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply accumulate, baseline version.
|
||
|
|
*
|
||
|
|
* Baseline version of gf_vect_mad() with same parameters.
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_vect_mad_base(int len, int vec, int vec_i, unsigned char *v, unsigned char *src,
|
||
|
|
unsigned char *dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 2 accumulate. SSE version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) multiply across each byte of input source with expanded
|
||
|
|
* constants and add to destination arrays. Can be used for erasure coding
|
||
|
|
* encode and decode update when only one source is available at a
|
||
|
|
* time. Function requires pre-calculation of a 32*vec byte constant array based
|
||
|
|
* on the input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vec The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param vec_i The vector index corresponding to the single input source.
|
||
|
|
* @param gftbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*vec.
|
||
|
|
* @param src Pointer to source input array.
|
||
|
|
* @param dest Array of pointers to destination input/outputs.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_2vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 2 accumulate. AVX version of gf_2vect_mad_sse().
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void gf_2vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 2 accumulate. AVX2 version of gf_2vect_mad_sse().
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void gf_2vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 3 accumulate. SSE version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) multiply across each byte of input source with expanded
|
||
|
|
* constants and add to destination arrays. Can be used for erasure coding
|
||
|
|
* encode and decode update when only one source is available at a
|
||
|
|
* time. Function requires pre-calculation of a 32*vec byte constant array based
|
||
|
|
* on the input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vec The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param vec_i The vector index corresponding to the single input source.
|
||
|
|
* @param gftbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*vec.
|
||
|
|
* @param src Pointer to source input array.
|
||
|
|
* @param dest Array of pointers to destination input/outputs.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_3vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 3 accumulate. AVX version of gf_3vect_mad_sse().
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void gf_3vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 3 accumulate. AVX2 version of gf_3vect_mad_sse().
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void gf_3vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 4 accumulate. SSE version.
|
||
|
|
*
|
||
|
|
* Does a GF(2^8) multiply across each byte of input source with expanded
|
||
|
|
* constants and add to destination arrays. Can be used for erasure coding
|
||
|
|
* encode and decode update when only one source is available at a
|
||
|
|
* time. Function requires pre-calculation of a 32*vec byte constant array based
|
||
|
|
* on the input coefficients.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*
|
||
|
|
* @param len Length of each vector in bytes. Must be >= 32.
|
||
|
|
* @param vec The number of vector sources or rows in the generator matrix
|
||
|
|
* for coding.
|
||
|
|
* @param vec_i The vector index corresponding to the single input source.
|
||
|
|
* @param gftbls Pointer to array of input tables generated from coding
|
||
|
|
* coefficients in ec_init_tables(). Must be of size 32*vec.
|
||
|
|
* @param src Pointer to source input array.
|
||
|
|
* @param dest Array of pointers to destination input/outputs.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_4vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 4 accumulate. AVX version of gf_4vect_mad_sse().
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void gf_4vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 4 accumulate. AVX2 version of gf_4vect_mad_sse().
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void gf_4vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 5 accumulate. SSE version.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*/
|
||
|
|
void gf_5vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 5 accumulate. AVX version.
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void gf_5vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 5 accumulate. AVX2 version.
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void gf_5vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 6 accumulate. SSE version.
|
||
|
|
* @requires SSE4.1
|
||
|
|
*/
|
||
|
|
void gf_6vect_mad_sse(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 6 accumulate. AVX version.
|
||
|
|
* @requires AVX
|
||
|
|
*/
|
||
|
|
void gf_6vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief GF(2^8) vector multiply with 6 accumulate. AVX2 version.
|
||
|
|
* @requires AVX2
|
||
|
|
*/
|
||
|
|
void gf_6vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
|
||
|
|
unsigned char **dest);
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* The remaining are lib support functions used in GF(2^8) operations.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Single element GF(2^8) multiply.
|
||
|
|
*
|
||
|
|
* @param a Multiplicand a
|
||
|
|
* @param b Multiplicand b
|
||
|
|
* @returns Product of a and b in GF(2^8)
|
||
|
|
*/
|
||
|
|
|
||
|
|
unsigned char gf_mul(unsigned char a, unsigned char b);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Single element GF(2^8) inverse.
|
||
|
|
*
|
||
|
|
* @param a Input element
|
||
|
|
* @returns Field element b such that a x b = {1}
|
||
|
|
*/
|
||
|
|
|
||
|
|
unsigned char gf_inv(unsigned char a);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate a matrix of coefficients to be used for encoding.
|
||
|
|
*
|
||
|
|
* Vandermonde matrix example of encoding coefficients where high portion of
|
||
|
|
* matrix is identity matrix I and lower portion is constructed as 2^{i*(j-k+1)}
|
||
|
|
* i:{0,k-1} j:{k,m-1}. Commonly used method for choosing coefficients in
|
||
|
|
* erasure encoding but does not guarantee invertable for every sub matrix. For
|
||
|
|
* large k it is possible to find cases where the decode matrix chosen from
|
||
|
|
* sources and parity not in erasure are not invertable. Users may want to
|
||
|
|
* adjust for k > 5.
|
||
|
|
*
|
||
|
|
* @param a [mxk] array to hold coefficients
|
||
|
|
* @param m number of rows in matrix corresponding to srcs + parity.
|
||
|
|
* @param k number of columns in matrix corresponding to srcs.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_gen_rs_matrix(unsigned char *a, int m, int k);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Generate a Cauchy matrix of coefficients to be used for encoding.
|
||
|
|
*
|
||
|
|
* Cauchy matrix example of encoding coefficients where high portion of matrix
|
||
|
|
* is identity matrix I and lower portion is constructed as 1/(i + j) | i != j,
|
||
|
|
* i:{0,k-1} j:{k,m-1}. Any sub-matrix of a Cauchy matrix should be invertable.
|
||
|
|
*
|
||
|
|
* @param a [mxk] array to hold coefficients
|
||
|
|
* @param m number of rows in matrix corresponding to srcs + parity.
|
||
|
|
* @param k number of columns in matrix corresponding to srcs.
|
||
|
|
* @returns none
|
||
|
|
*/
|
||
|
|
|
||
|
|
void gf_gen_cauchy1_matrix(unsigned char *a, int m, int k);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Invert a matrix in GF(2^8)
|
||
|
|
*
|
||
|
|
* @param in input matrix
|
||
|
|
* @param out output matrix such that [in] x [out] = [I] - identity matrix
|
||
|
|
* @param n size of matrix [nxn]
|
||
|
|
* @returns 0 successful, other fail on singular input matrix
|
||
|
|
*/
|
||
|
|
|
||
|
|
int gf_invert_matrix(unsigned char *in, unsigned char *out, const int n);
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************/
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif //_ERASURE_CODE_H_
|