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Diffstat (limited to '3rdparty/openpgm-svn-r1135/pgm/galois_generator.pl')
| -rwxr-xr-x | 3rdparty/openpgm-svn-r1135/pgm/galois_generator.pl | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/3rdparty/openpgm-svn-r1135/pgm/galois_generator.pl b/3rdparty/openpgm-svn-r1135/pgm/galois_generator.pl new file mode 100755 index 0000000..b3f531d --- /dev/null +++ b/3rdparty/openpgm-svn-r1135/pgm/galois_generator.pl @@ -0,0 +1,139 @@ +#!/usr/bin/perl +# +# Galois field table generator. +# +# Copyright (c) 2006-2010 Miru Limited. +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +use strict; + +my $GF_ELEMENT_BYTES = 1; +my $GF_ELEMENT_BITS = 8 * $GF_ELEMENT_BYTES; +my $GF_NO_ELEMENTS = 1 << $GF_ELEMENT_BITS; +my $GF_MAX = $GF_NO_ELEMENTS - 1; + +my $GF_GENERATOR = 0x11d; + +my @gflog; +my @gfantilog; + +my $j = 1; + +for (my $i = 0; $i < $GF_MAX; $i++) +{ + $gflog[ $j ] = $i; + $gfantilog[ $i ] = $j; + + $j <<= 1; + if ($j & $GF_NO_ELEMENTS) { + $j ^= $GF_GENERATOR; + } +} + +$gflog[ 0 ] = $GF_MAX; +$gfantilog[ $GF_MAX ] = 0; + +print<<MOO; +/* vim:ts=8:sts=8:sw=4:noai:noexpandtab + * + * Galois field tables + * + * Copyright (c) 2006-2010 Miru Limited. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <impl/framework.h> + + +/* globals */ + +const pgm_gf8_t pgm_gflog[PGM_GF_NO_ELEMENTS] = +{ +MOO + +# print out y = log₂(x) table +for (my $i = 0; $i < $GF_NO_ELEMENTS; $i++) +{ + print "\t" if ($i % 8 == 0); + print sprintf("0x%2.2x", $gflog[ $i ]); + print ',' unless ($i == $GF_MAX); + print ( (($i % 8) == 7) ? "\n" : ' ' ); +} + +print<<MOO; +}; + +const pgm_gf8_t pgm_gfantilog[PGM_GF_NO_ELEMENTS] = +{ +MOO + +# print out y = antilog₂(x) table, aka pow2(x), 2^^x +for (my $i = 0; $i < $GF_NO_ELEMENTS; $i++) +{ + print "\t" if ($i % 8 == 0); + print sprintf("0x%2.2x", $gfantilog[ $i ]); + print ',' unless ($i == $GF_MAX); + print ( (($i % 8) == 7) ? "\n" : ' ' ); +} + +print<<MOO; +}; + +#ifdef CONFIG_GALOIS_MUL_LUT +const pgm_gf8_t pgm_gftable[PGM_GF_NO_ELEMENTS * PGM_GF_NO_ELEMENTS] = +{ +MOO + +sub gfmul { + my($a, $b) = @_; + return 0 if ($a == 0 || $b == 0); + my $sum = $gflog[ $a ] + $gflog[ $b ]; + return ($sum >= $GF_MAX) ? $gfantilog[ $sum - $GF_MAX ] : $gfantilog[ $sum ]; +} + +# print out multiplication table z = x • y +for (my $i = 0; $i < $GF_NO_ELEMENTS; $i++) +{ + for (my $j = 0; $j < $GF_NO_ELEMENTS; $j++) + { + print "\t" if ($j % 8 == 0); + print sprintf("0x%2.2x", gfmul( $i, $j )); + print ',' unless ($i == $GF_MAX && $j == $GF_MAX); + print ( (($j % 8) == 7) ? "\n" : ' ' ); + } +} + +print<<MOO; +}; +#endif + +/* eof */ +MOO + +# eof |