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1 | /* -*-c-*- |
2 | * |
b817bfc6 |
3 | * $Id: field-parse.c,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
432c4e18 |
4 | * |
5 | * Parse field descriptions |
6 | * |
7 | * (c) 2004 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 | |
432c4e18 |
30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include "field.h" |
33 | |
34 | /*----- Main code ---------------------------------------------------------*/ |
35 | |
36 | /* --- @field_parse@ --- * |
37 | * |
38 | * Arguments: @qd_parse *qd@ = parser context |
39 | * |
40 | * Returns: Field pointer if OK, or null. |
41 | * |
42 | * Use: Parses a field description, which has the form |
43 | * |
44 | * * `prime', `niceprime' or `binpoly' |
45 | * * an optional `:' |
46 | * * the field modulus |
47 | */ |
48 | |
49 | field *field_parse(qd_parse *qd) |
50 | { |
4edc47b8 |
51 | field *f = 0; |
52 | mp *m = MP_NEW, *b = MP_NEW; |
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53 | |
4edc47b8 |
54 | switch (qd_enum(qd, "prime,niceprime,binpoly,binnorm")) { |
432c4e18 |
55 | case 0: |
56 | qd_delim(qd, ':'); |
4edc47b8 |
57 | if ((m = qd_getmp(qd)) == 0) goto done; |
432c4e18 |
58 | f = field_prime(m); |
59 | break; |
60 | case 1: |
61 | qd_delim(qd, ':'); |
4edc47b8 |
62 | if ((m = qd_getmp(qd)) == 0) goto done; |
432c4e18 |
63 | f = field_niceprime(m); |
64 | break; |
65 | case 2: |
66 | qd_delim(qd, ':'); |
4edc47b8 |
67 | if ((m = qd_getmp(qd)) == 0) goto done; |
432c4e18 |
68 | f = field_binpoly(m); |
69 | break; |
4edc47b8 |
70 | case 3: |
71 | qd_delim(qd, ':'); |
72 | if ((m = qd_getmp(qd)) == 0) goto done; |
73 | qd_delim(qd, ','); |
74 | if ((b = qd_getmp(qd)) == 0) goto done; |
75 | f = field_binnorm(m, b); |
76 | break; |
432c4e18 |
77 | default: |
02d7884d |
78 | goto done; |
432c4e18 |
79 | } |
02d7884d |
80 | if (!f) qd->e = "bad field parameters"; |
4edc47b8 |
81 | done: |
432c4e18 |
82 | mp_drop(m); |
4edc47b8 |
83 | mp_drop(b); |
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84 | return (f); |
85 | } |
86 | |
87 | /*----- That's all, folks -------------------------------------------------*/ |