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1 | /* -*-c-*- |
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2 | * |
3 | * Parse field descriptions |
4 | * |
5 | * (c) 2004 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 "field.h" |
31 | |
32 | /*----- Main code ---------------------------------------------------------*/ |
33 | |
34 | /* --- @field_parse@ --- * |
35 | * |
36 | * Arguments: @qd_parse *qd@ = parser context |
37 | * |
38 | * Returns: Field pointer if OK, or null. |
39 | * |
40 | * Use: Parses a field description, which has the form |
41 | * |
42 | * * `prime', `niceprime' or `binpoly' |
43 | * * an optional `:' |
44 | * * the field modulus |
45 | */ |
46 | |
47 | field *field_parse(qd_parse *qd) |
48 | { |
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49 | field *f = 0; |
50 | mp *m = MP_NEW, *b = MP_NEW; |
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51 | |
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52 | switch (qd_enum(qd, "prime,niceprime,binpoly,binnorm")) { |
432c4e18 |
53 | case 0: |
54 | qd_delim(qd, ':'); |
4edc47b8 |
55 | if ((m = qd_getmp(qd)) == 0) goto done; |
432c4e18 |
56 | f = field_prime(m); |
57 | break; |
58 | case 1: |
59 | qd_delim(qd, ':'); |
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60 | if ((m = qd_getmp(qd)) == 0) goto done; |
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61 | f = field_niceprime(m); |
62 | break; |
63 | case 2: |
64 | qd_delim(qd, ':'); |
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65 | if ((m = qd_getmp(qd)) == 0) goto done; |
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66 | f = field_binpoly(m); |
67 | break; |
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68 | case 3: |
69 | qd_delim(qd, ':'); |
70 | if ((m = qd_getmp(qd)) == 0) goto done; |
71 | qd_delim(qd, ','); |
72 | if ((b = qd_getmp(qd)) == 0) goto done; |
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73 | f = field_binnorm(m, b); |
4edc47b8 |
74 | break; |
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75 | default: |
02d7884d |
76 | goto done; |
432c4e18 |
77 | } |
02d7884d |
78 | if (!f) qd->e = "bad field parameters"; |
4edc47b8 |
79 | done: |
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80 | mp_drop(m); |
4edc47b8 |
81 | mp_drop(b); |
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82 | return (f); |
83 | } |
84 | |
85 | /*----- That's all, folks -------------------------------------------------*/ |