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