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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: gfx-sqr-mktab.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Build table for squaring of binary polynomials |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <stdio.h> |
33 | #include <stdlib.h> |
34 | |
35 | #include <mLib/bits.h> |
36 | |
37 | /*----- Main code ---------------------------------------------------------*/ |
38 | |
39 | static void mktab(uint16 *t) |
40 | { |
41 | unsigned i, j, x; |
42 | |
43 | for (i = 0; i < 256; i++) { |
44 | x = 0; |
45 | for (j = 0; j < 8; j++) { |
46 | if (i & (1 << j)) |
47 | x |= 1 << (2 * j); |
48 | } |
49 | t[i] = x; |
50 | } |
51 | } |
52 | |
53 | int main(void) |
54 | { |
55 | uint16 t[256]; |
56 | unsigned i; |
57 | |
58 | mktab(t); |
59 | fputs("\ |
60 | /* -*-c-*-\n\ |
61 | *\n\ |
62 | * Bit spacing table for binary polynomial squaring\n\ |
63 | */\n\ |
64 | \n\ |
65 | #ifndef GFX_SQR_TAB_H\n\ |
66 | #define GFX_SQR_TAB_H\n\ |
67 | \n\ |
68 | #define GFX_SQRTAB { \\\n\ |
69 | ", stdout); |
70 | |
71 | for (i = 0; i < 256; i++) { |
72 | printf("0x%04x", t[i]); |
73 | if (i == 255) |
74 | puts(" \\\n}\n"); |
75 | else if (i % 8 == 7) |
76 | fputs(", \\\n ", stdout); |
77 | else |
78 | fputs(", ", stdout); |
79 | } |
80 | |
81 | fputs("#endif\n", stdout); |
82 | |
83 | if (fclose(stdout)) { |
84 | fprintf(stderr, "error writing data\n"); |
85 | exit(EXIT_FAILURE); |
86 | } |
87 | |
88 | return (0); |
89 | } |
90 | |
91 | /*----- That's all, folks -------------------------------------------------*/ |