diff options
Diffstat (limited to 'lib/reed_solomon/decode_rs.c')
| -rw-r--r-- | lib/reed_solomon/decode_rs.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c index d401dec..a58df56 100644 --- a/lib/reed_solomon/decode_rs.c +++ b/lib/reed_solomon/decode_rs.c @@ -1,22 +1,22 @@ -/* +/* * lib/reed_solomon/decode_rs.c * * Overview: * Generic Reed Solomon encoder / decoder library - * + * * Copyright 2002, Phil Karn, KA9Q * May be used under the terms of the GNU General Public License (GPL) * * Adaption to the kernel by Thomas Gleixner (tglx@linutronix.de) * - * $Id: decode_rs.c,v 1.6 2004/10/22 15:41:47 gleixner Exp $ + * $Id: decode_rs.c,v 1.7 2005/11/07 11:14:59 gleixner Exp $ * */ -/* Generic data width independent code which is included by the +/* Generic data width independent code which is included by the * wrappers. */ -{ +{ int deg_lambda, el, deg_omega; int i, j, r, k, pad; int nn = rs->nn; @@ -41,9 +41,9 @@ pad = nn - nroots - len; if (pad < 0 || pad >= nn) return -ERANGE; - + /* Does the caller provide the syndrome ? */ - if (s != NULL) + if (s != NULL) goto decode; /* form the syndromes; i.e., evaluate data(x) at roots of @@ -54,11 +54,11 @@ for (j = 1; j < len; j++) { for (i = 0; i < nroots; i++) { if (syn[i] == 0) { - syn[i] = (((uint16_t) data[j]) ^ + syn[i] = (((uint16_t) data[j]) ^ invmsk) & msk; } else { syn[i] = ((((uint16_t) data[j]) ^ - invmsk) & msk) ^ + invmsk) & msk) ^ alpha_to[rs_modnn(rs, index_of[syn[i]] + (fcr + i) * prim)]; } @@ -70,7 +70,7 @@ if (syn[i] == 0) { syn[i] = ((uint16_t) par[j]) & msk; } else { - syn[i] = (((uint16_t) par[j]) & msk) ^ + syn[i] = (((uint16_t) par[j]) & msk) ^ alpha_to[rs_modnn(rs, index_of[syn[i]] + (fcr+i)*prim)]; } @@ -99,14 +99,14 @@ if (no_eras > 0) { /* Init lambda to be the erasure locator polynomial */ - lambda[1] = alpha_to[rs_modnn(rs, + lambda[1] = alpha_to[rs_modnn(rs, prim * (nn - 1 - eras_pos[0]))]; for (i = 1; i < no_eras; i++) { u = rs_modnn(rs, prim * (nn - 1 - eras_pos[i])); for (j = i + 1; j > 0; j--) { tmp = index_of[lambda[j - 1]]; if (tmp != nn) { - lambda[j] ^= + lambda[j] ^= alpha_to[rs_modnn(rs, u + tmp)]; } } @@ -127,8 +127,8 @@ discr_r = 0; for (i = 0; i < r; i++) { if ((lambda[i] != 0) && (s[r - i - 1] != nn)) { - discr_r ^= - alpha_to[rs_modnn(rs, + discr_r ^= + alpha_to[rs_modnn(rs, index_of[lambda[i]] + s[r - i - 1])]; } @@ -143,7 +143,7 @@ t[0] = lambda[0]; for (i = 0; i < nroots; i++) { if (b[i] != nn) { - t[i + 1] = lambda[i + 1] ^ + t[i + 1] = lambda[i + 1] ^ alpha_to[rs_modnn(rs, discr_r + b[i])]; } else @@ -229,7 +229,7 @@ num1 = 0; for (i = deg_omega; i >= 0; i--) { if (omega[i] != nn) - num1 ^= alpha_to[rs_modnn(rs, omega[i] + + num1 ^= alpha_to[rs_modnn(rs, omega[i] + i * root[j])]; } num2 = alpha_to[rs_modnn(rs, root[j] * (fcr - 1) + nn)]; @@ -239,13 +239,13 @@ * lambda_pr of lambda[i] */ for (i = min(deg_lambda, nroots - 1) & ~1; i >= 0; i -= 2) { if (lambda[i + 1] != nn) { - den ^= alpha_to[rs_modnn(rs, lambda[i + 1] + + den ^= alpha_to[rs_modnn(rs, lambda[i + 1] + i * root[j])]; } } /* Apply error to data */ if (num1 != 0 && loc[j] >= pad) { - uint16_t cor = alpha_to[rs_modnn(rs,index_of[num1] + + uint16_t cor = alpha_to[rs_modnn(rs,index_of[num1] + index_of[num2] + nn - index_of[den])]; /* Store the error correction pattern, if a |