| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Parse field descriptions |
| 4 | * |
| 5 | * (c) 2004 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 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. |
| 16 | * |
| 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. |
| 21 | * |
| 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 | |
| 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 | { |
| 49 | field *f = 0; |
| 50 | mp *m = MP_NEW, *b = MP_NEW; |
| 51 | |
| 52 | switch (qd_enum(qd, "prime,niceprime,binpoly,binnorm")) { |
| 53 | case 0: |
| 54 | qd_delim(qd, ':'); |
| 55 | if ((m = qd_getmp(qd)) == 0) goto done; |
| 56 | f = field_prime(m); |
| 57 | break; |
| 58 | case 1: |
| 59 | qd_delim(qd, ':'); |
| 60 | if ((m = qd_getmp(qd)) == 0) goto done; |
| 61 | f = field_niceprime(m); |
| 62 | break; |
| 63 | case 2: |
| 64 | qd_delim(qd, ':'); |
| 65 | if ((m = qd_getmp(qd)) == 0) goto done; |
| 66 | f = field_binpoly(m); |
| 67 | break; |
| 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; |
| 73 | f = field_binnorm(m, b); |
| 74 | break; |
| 75 | default: |
| 76 | goto done; |
| 77 | } |
| 78 | if (!f) qd->e = "bad field parameters"; |
| 79 | done: |
| 80 | mp_drop(m); |
| 81 | mp_drop(b); |
| 82 | return (f); |
| 83 | } |
| 84 | |
| 85 | /*----- That's all, folks -------------------------------------------------*/ |