1 // SPDX-License-Identifier: GPL-2.0 1 2 /* 3 * Generic Reed Solomon encoder / decoder libr 4 * 5 * Copyright 2002, Phil Karn, KA9Q 6 * May be used under the terms of the GNU Gene 7 * 8 * Adaption to the kernel by Thomas Gleixner ( 9 * 10 * Generic data width independent code which i 11 */ 12 { 13 struct rs_codec *rs = rsc->codec; 14 int i, j, pad; 15 int nn = rs->nn; 16 int nroots = rs->nroots; 17 uint16_t *alpha_to = rs->alpha_to; 18 uint16_t *index_of = rs->index_of; 19 uint16_t *genpoly = rs->genpoly; 20 uint16_t fb; 21 uint16_t msk = (uint16_t) rs->nn; 22 23 /* Check length parameter for validity 24 pad = nn - nroots - len; 25 if (pad < 0 || pad >= nn) 26 return -ERANGE; 27 28 for (i = 0; i < len; i++) { 29 fb = index_of[((((uint16_t) da 30 /* feedback term is non-zero * 31 if (fb != nn) { 32 for (j = 1; j < nroots 33 par[j] ^= alph 34 35 } 36 } 37 /* Shift */ 38 memmove(&par[0], &par[1], size 39 if (fb != nn) { 40 par[nroots - 1] = alph 41 42 } else { 43 par[nroots - 1] = 0; 44 } 45 } 46 return 0; 47 } 48
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