mirror of https://gitee.com/openkylin/linux.git
[LIB] reed_solomon: Clean up trailing white spaces
This commit is contained in:
Thomas Gleixner
Thomas Gleixner
parent
182ec4eee3
commit
03ead8427d
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@ -1,15 +1,15 @@
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/*
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/*
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* include/linux/rslib.h
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*
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* Overview:
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* Generic Reed Solomon encoder / decoder library
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*
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*
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* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
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*
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* RS code lifted from reed solomon library written by Phil Karn
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* Copyright 2002 Phil Karn, KA9Q
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*
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* $Id: rslib.h,v 1.3 2004/10/05 22:08:22 gleixner Exp $
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* $Id: rslib.h,v 1.4 2005/11/07 11:14:52 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -21,20 +21,20 @@
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#include <linux/list.h>
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/**
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/**
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* struct rs_control - rs control structure
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*
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*
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* @mm: Bits per symbol
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* @nn: Symbols per block (= (1<<mm)-1)
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* @alpha_to: log lookup table
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* @index_of: Antilog lookup table
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* @genpoly: Generator polynomial
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* @genpoly: Generator polynomial
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* @nroots: Number of generator roots = number of parity symbols
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* @fcr: First consecutive root, index form
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* @prim: Primitive element, index form
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* @iprim: prim-th root of 1, index form
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* @gfpoly: The primitive generator polynominal
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* @users: Users of this structure
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* @prim: Primitive element, index form
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* @iprim: prim-th root of 1, index form
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* @gfpoly: The primitive generator polynominal
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* @users: Users of this structure
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* @list: List entry for the rs control list
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*/
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struct rs_control {
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@ -58,7 +58,7 @@ int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par,
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uint16_t invmsk);
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#endif
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#ifdef CONFIG_REED_SOLOMON_DEC8
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int decode_rs8(struct rs_control *rs, uint8_t *data, uint16_t *par, int len,
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int decode_rs8(struct rs_control *rs, uint8_t *data, uint16_t *par, int len,
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uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
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uint16_t *corr);
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#endif
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@ -75,7 +75,7 @@ int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len,
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#endif
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/* Create or get a matching rs control structure */
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struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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int nroots);
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/* Release a rs control structure */
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@ -87,9 +87,9 @@ void free_rs(struct rs_control *rs);
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* @x: the value to reduce
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*
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* where
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* rs->mm = number of bits per symbol
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* rs->mm = number of bits per symbol
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* rs->nn = (2^rs->mm) - 1
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*
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*
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* Simple arithmetic modulo would return a wrong result for values
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* >= 3 * rs->nn
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*/
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@ -1,5 +1,5 @@
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#
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# This is a modified version of reed solomon lib,
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# This is a modified version of reed solomon lib,
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#
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obj-$(CONFIG_REED_SOLOMON) += reed_solomon.o
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@ -1,22 +1,22 @@
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/*
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/*
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* lib/reed_solomon/decode_rs.c
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*
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* Overview:
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* Generic Reed Solomon encoder / decoder library
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*
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*
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* Copyright 2002, Phil Karn, KA9Q
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* May be used under the terms of the GNU General Public License (GPL)
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*
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* Adaption to the kernel by Thomas Gleixner (tglx@linutronix.de)
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*
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* $Id: decode_rs.c,v 1.6 2004/10/22 15:41:47 gleixner Exp $
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* $Id: decode_rs.c,v 1.7 2005/11/07 11:14:59 gleixner Exp $
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*
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*/
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/* Generic data width independent code which is included by the
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/* Generic data width independent code which is included by the
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* wrappers.
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*/
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{
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{
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int deg_lambda, el, deg_omega;
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int i, j, r, k, pad;
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int nn = rs->nn;
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@ -41,9 +41,9 @@
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pad = nn - nroots - len;
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if (pad < 0 || pad >= nn)
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return -ERANGE;
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/* Does the caller provide the syndrome ? */
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if (s != NULL)
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if (s != NULL)
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goto decode;
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/* form the syndromes; i.e., evaluate data(x) at roots of
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@ -54,11 +54,11 @@
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for (j = 1; j < len; j++) {
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for (i = 0; i < nroots; i++) {
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if (syn[i] == 0) {
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syn[i] = (((uint16_t) data[j]) ^
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syn[i] = (((uint16_t) data[j]) ^
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invmsk) & msk;
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} else {
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syn[i] = ((((uint16_t) data[j]) ^
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invmsk) & msk) ^
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invmsk) & msk) ^
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alpha_to[rs_modnn(rs, index_of[syn[i]] +
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(fcr + i) * prim)];
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}
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@ -70,7 +70,7 @@
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if (syn[i] == 0) {
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syn[i] = ((uint16_t) par[j]) & msk;
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} else {
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syn[i] = (((uint16_t) par[j]) & msk) ^
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syn[i] = (((uint16_t) par[j]) & msk) ^
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alpha_to[rs_modnn(rs, index_of[syn[i]] +
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(fcr+i)*prim)];
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}
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@ -99,14 +99,14 @@
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if (no_eras > 0) {
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/* Init lambda to be the erasure locator polynomial */
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lambda[1] = alpha_to[rs_modnn(rs,
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lambda[1] = alpha_to[rs_modnn(rs,
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prim * (nn - 1 - eras_pos[0]))];
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for (i = 1; i < no_eras; i++) {
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u = rs_modnn(rs, prim * (nn - 1 - eras_pos[i]));
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for (j = i + 1; j > 0; j--) {
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tmp = index_of[lambda[j - 1]];
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if (tmp != nn) {
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lambda[j] ^=
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lambda[j] ^=
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alpha_to[rs_modnn(rs, u + tmp)];
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}
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}
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@ -127,8 +127,8 @@
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discr_r = 0;
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for (i = 0; i < r; i++) {
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if ((lambda[i] != 0) && (s[r - i - 1] != nn)) {
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discr_r ^=
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alpha_to[rs_modnn(rs,
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discr_r ^=
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alpha_to[rs_modnn(rs,
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index_of[lambda[i]] +
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s[r - i - 1])];
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}
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@ -143,7 +143,7 @@
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t[0] = lambda[0];
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for (i = 0; i < nroots; i++) {
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if (b[i] != nn) {
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t[i + 1] = lambda[i + 1] ^
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t[i + 1] = lambda[i + 1] ^
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alpha_to[rs_modnn(rs, discr_r +
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b[i])];
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} else
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@ -229,7 +229,7 @@
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num1 = 0;
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for (i = deg_omega; i >= 0; i--) {
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if (omega[i] != nn)
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num1 ^= alpha_to[rs_modnn(rs, omega[i] +
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num1 ^= alpha_to[rs_modnn(rs, omega[i] +
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i * root[j])];
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}
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num2 = alpha_to[rs_modnn(rs, root[j] * (fcr - 1) + nn)];
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@ -239,13 +239,13 @@
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* lambda_pr of lambda[i] */
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for (i = min(deg_lambda, nroots - 1) & ~1; i >= 0; i -= 2) {
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if (lambda[i + 1] != nn) {
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den ^= alpha_to[rs_modnn(rs, lambda[i + 1] +
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den ^= alpha_to[rs_modnn(rs, lambda[i + 1] +
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i * root[j])];
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}
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}
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/* Apply error to data */
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if (num1 != 0 && loc[j] >= pad) {
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uint16_t cor = alpha_to[rs_modnn(rs,index_of[num1] +
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uint16_t cor = alpha_to[rs_modnn(rs,index_of[num1] +
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index_of[num2] +
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nn - index_of[den])];
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/* Store the error correction pattern, if a
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@ -1,19 +1,19 @@
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/*
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/*
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* lib/reed_solomon/encode_rs.c
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*
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* Overview:
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* Generic Reed Solomon encoder / decoder library
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*
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*
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* Copyright 2002, Phil Karn, KA9Q
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* May be used under the terms of the GNU General Public License (GPL)
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*
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* Adaption to the kernel by Thomas Gleixner (tglx@linutronix.de)
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*
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* $Id: encode_rs.c,v 1.4 2004/10/22 15:41:47 gleixner Exp $
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* $Id: encode_rs.c,v 1.5 2005/11/07 11:14:59 gleixner Exp $
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*
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*/
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/* Generic data width independent code which is included by the
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/* Generic data width independent code which is included by the
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* wrappers.
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* int encode_rsX (struct rs_control *rs, uintX_t *data, int len, uintY_t *par)
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*/
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@ -35,16 +35,16 @@
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for (i = 0; i < len; i++) {
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fb = index_of[((((uint16_t) data[i])^invmsk) & msk) ^ par[0]];
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/* feedback term is non-zero */
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if (fb != nn) {
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if (fb != nn) {
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for (j = 1; j < nroots; j++) {
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par[j] ^= alpha_to[rs_modnn(rs, fb +
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par[j] ^= alpha_to[rs_modnn(rs, fb +
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genpoly[nroots - j])];
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}
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}
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/* Shift */
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memmove(&par[0], &par[1], sizeof(uint16_t) * (nroots - 1));
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if (fb != nn) {
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par[nroots - 1] = alpha_to[rs_modnn(rs,
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par[nroots - 1] = alpha_to[rs_modnn(rs,
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fb + genpoly[0])];
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} else {
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par[nroots - 1] = 0;
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@ -1,22 +1,22 @@
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/*
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/*
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* lib/reed_solomon/rslib.c
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*
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* Overview:
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* Generic Reed Solomon encoder / decoder library
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*
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*
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* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
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*
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* Reed Solomon code lifted from reed solomon library written by Phil Karn
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* Copyright 2002 Phil Karn, KA9Q
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*
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* $Id: rslib.c,v 1.5 2004/10/22 15:41:47 gleixner Exp $
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* $Id: rslib.c,v 1.7 2005/11/07 11:14:59 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Description:
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*
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*
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* The generic Reed Solomon library provides runtime configurable
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* encoding / decoding of RS codes.
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* Each user must call init_rs to get a pointer to a rs_control
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@ -25,11 +25,11 @@
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* If a structure is generated then the polynomial arrays for
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* fast encoding / decoding are built. This can take some time so
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* make sure not to call this function from a time critical path.
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* Usually a module / driver should initialize the necessary
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* Usually a module / driver should initialize the necessary
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* rs_control structure on module / driver init and release it
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* on exit.
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* The encoding puts the calculated syndrome into a given syndrome
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* buffer.
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* The encoding puts the calculated syndrome into a given syndrome
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* buffer.
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* The decoding is a two step process. The first step calculates
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* the syndrome over the received (data + syndrome) and calls the
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* second stage, which does the decoding / error correction itself.
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@ -51,7 +51,7 @@ static LIST_HEAD (rslist);
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/* Protection for the list */
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static DECLARE_MUTEX(rslistlock);
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/**
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/**
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* rs_init - Initialize a Reed-Solomon codec
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*
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* @symsize: symbol size, bits (1-8)
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@ -63,7 +63,7 @@ static DECLARE_MUTEX(rslistlock);
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* Allocate a control structure and the polynom arrays for faster
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* en/decoding. Fill the arrays according to the given parameters
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*/
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static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
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static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
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int prim, int nroots)
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{
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struct rs_control *rs;
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@ -124,15 +124,15 @@ static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
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/* Multiply rs->genpoly[] by @**(root + x) */
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for (j = i; j > 0; j--) {
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if (rs->genpoly[j] != 0) {
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rs->genpoly[j] = rs->genpoly[j -1] ^
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rs->alpha_to[rs_modnn(rs,
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rs->genpoly[j] = rs->genpoly[j -1] ^
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rs->alpha_to[rs_modnn(rs,
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rs->index_of[rs->genpoly[j]] + root)];
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} else
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rs->genpoly[j] = rs->genpoly[j - 1];
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}
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/* rs->genpoly[0] can never be zero */
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rs->genpoly[0] =
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rs->alpha_to[rs_modnn(rs,
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rs->genpoly[0] =
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rs->alpha_to[rs_modnn(rs,
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rs->index_of[rs->genpoly[0]] + root)];
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}
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/* convert rs->genpoly[] to index form for quicker encoding */
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@ -153,7 +153,7 @@ static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
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}
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/**
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/**
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* free_rs - Free the rs control structure, if its not longer used
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*
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* @rs: the control structure which is not longer used by the
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@ -173,19 +173,19 @@ void free_rs(struct rs_control *rs)
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up(&rslistlock);
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}
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/**
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/**
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* init_rs - Find a matching or allocate a new rs control structure
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*
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* @symsize: the symbol size (number of bits)
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* @gfpoly: the extended Galois field generator polynomial coefficients,
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* with the 0th coefficient in the low order bit. The polynomial
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* must be primitive;
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* @fcr: the first consecutive root of the rs code generator polynomial
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* @fcr: the first consecutive root of the rs code generator polynomial
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* in index form
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* @prim: primitive element to generate polynomial roots
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* @nroots: RS code generator polynomial degree (number of roots)
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*/
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struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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int nroots)
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{
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struct list_head *tmp;
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@ -198,9 +198,9 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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return NULL;
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if (prim <= 0 || prim >= (1<<symsize))
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return NULL;
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if (nroots < 0 || nroots >= (1<<symsize) || nroots > 8)
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if (nroots < 0 || nroots >= (1<<symsize))
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return NULL;
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down(&rslistlock);
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/* Walk through the list and look for a matching entry */
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@ -211,9 +211,9 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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if (gfpoly != rs->gfpoly)
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continue;
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if (fcr != rs->fcr)
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continue;
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continue;
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if (prim != rs->prim)
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continue;
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continue;
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if (nroots != rs->nroots)
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continue;
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/* We have a matching one already */
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@ -227,18 +227,18 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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rs->users = 1;
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list_add(&rs->list, &rslist);
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}
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out:
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out:
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up(&rslistlock);
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return rs;
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}
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#ifdef CONFIG_REED_SOLOMON_ENC8
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/**
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/**
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* encode_rs8 - Calculate the parity for data values (8bit data width)
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*
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* @rs: the rs control structure
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* @data: data field of a given type
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* @len: data length
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* @len: data length
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* @par: parity data, must be initialized by caller (usually all 0)
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* @invmsk: invert data mask (will be xored on data)
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*
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@ -246,7 +246,7 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
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* symbol size > 8. The calling code must take care of encoding of the
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* syndrome result for storage itself.
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*/
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int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par,
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int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par,
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uint16_t invmsk)
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{
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#include "encode_rs.c"
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@ -255,7 +255,7 @@ EXPORT_SYMBOL_GPL(encode_rs8);
|
|||
#endif
|
||||
|
||||
#ifdef CONFIG_REED_SOLOMON_DEC8
|
||||
/**
|
||||
/**
|
||||
* decode_rs8 - Decode codeword (8bit data width)
|
||||
*
|
||||
* @rs: the rs control structure
|
||||
|
|
@ -273,7 +273,7 @@ EXPORT_SYMBOL_GPL(encode_rs8);
|
|||
* syndrome result and the received parity before calling this code.
|
||||
*/
|
||||
int decode_rs8(struct rs_control *rs, uint8_t *data, uint16_t *par, int len,
|
||||
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
||||
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
||||
uint16_t *corr)
|
||||
{
|
||||
#include "decode_rs.c"
|
||||
|
|
@ -287,13 +287,13 @@ EXPORT_SYMBOL_GPL(decode_rs8);
|
|||
*
|
||||
* @rs: the rs control structure
|
||||
* @data: data field of a given type
|
||||
* @len: data length
|
||||
* @len: data length
|
||||
* @par: parity data, must be initialized by caller (usually all 0)
|
||||
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
||||
*
|
||||
* Each field in the data array contains up to symbol size bits of valid data.
|
||||
*/
|
||||
int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par,
|
||||
int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par,
|
||||
uint16_t invmsk)
|
||||
{
|
||||
#include "encode_rs.c"
|
||||
|
|
@ -302,7 +302,7 @@ EXPORT_SYMBOL_GPL(encode_rs16);
|
|||
#endif
|
||||
|
||||
#ifdef CONFIG_REED_SOLOMON_DEC16
|
||||
/**
|
||||
/**
|
||||
* decode_rs16 - Decode codeword (16bit data width)
|
||||
*
|
||||
* @rs: the rs control structure
|
||||
|
|
@ -312,13 +312,13 @@ EXPORT_SYMBOL_GPL(encode_rs16);
|
|||
* @s: syndrome data field (if NULL, syndrome is calculated)
|
||||
* @no_eras: number of erasures
|
||||
* @eras_pos: position of erasures, can be NULL
|
||||
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
||||
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
||||
* @corr: buffer to store correction bitmask on eras_pos
|
||||
*
|
||||
* Each field in the data array contains up to symbol size bits of valid data.
|
||||
*/
|
||||
int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len,
|
||||
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
||||
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
||||
uint16_t *corr)
|
||||
{
|
||||
#include "decode_rs.c"
|
||||
|
|
|
|||
Loading…
Reference in New Issue