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[/] [reedsolomon/] [trunk/] [cpp-source/] [gf_arith.h] - Rev 2
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//----------------------------------------------------------------------// // The MIT License // // Copyright (c) 2010 Abhinav Agarwal, Alfred Man Cheuk Ng // Contact: abhiag@gmail.com // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, // copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR // OTHER DEALINGS IN THE SOFTWARE. //----------------------------------------------------------------------// #include "global_rs.h" const unsigned int pp [mm+1] = { 1, 0, 1, 1, 1, 0, 0, 0, 1} ; /* specify irreducible polynomial coeffts */ const unsigned char pp_char = 29; void generate_gf( int *alpha_to, int *index_of); unsigned char gfmult_lut(unsigned char a, unsigned char b, int *alpha_to, int *index_of); unsigned char gfmult_hw(unsigned char a, unsigned char b); unsigned char gfadd_hw(unsigned char a, unsigned char b); unsigned char gfinv_lut(unsigned char a); unsigned char alpha (unsigned char n); unsigned char alphainv_lut (unsigned char n); unsigned char gfdiv_lut (unsigned char dividend, unsigned char divisor); void polymult_mod2t (unsigned char *result, unsigned char *left, unsigned char *right); void compute_deriv (unsigned char lambda[tt], unsigned char lambda_deriv[tt]); unsigned char poly_eval (unsigned char poly[tt], unsigned char alpha_inv);