Standard curves and curve checking.

[u/mdw/catacomb] / field-parse.c

diff --git a/field-parse.c b/field-parse.c
new file mode 100644 (file)
index 0000000..0a09e57
--- /dev/null
+++ b/field-parse.c
@@ -0,0 +1,86 @@
+/* -*-c-*-
+ *
+ * $Id: field-parse.c,v 1.1 2004/03/27 17:54:11 mdw Exp $
+ *
+ * Parse field descriptions
+ *
+ * (c) 2004 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: field-parse.c,v $
+ * Revision 1.1  2004/03/27 17:54:11  mdw
+ * Standard curves and curve checking.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include "field.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @field_parse@ --- *
+ *
+ * Arguments:  @qd_parse *qd@ = parser context
+ *
+ * Returns:    Field pointer if OK, or null.
+ *
+ * Use:                Parses a field description, which has the form
+ *
+ *               * `prime', `niceprime' or `binpoly'
+ *               * an optional `:'
+ *               * the field modulus
+ */
+
+field *field_parse(qd_parse *qd)
+{
+  field *f;
+  mp *m = MP_NEW;
+
+  switch (qd_enum(qd, "prime,niceprime,binpoly")) {
+    case 0:
+      qd_delim(qd, ':');
+      if ((m = qd_getmp(qd)) == 0) return (0);
+      f = field_prime(m);
+      break;
+    case 1:
+      qd_delim(qd, ':');
+      if ((m = qd_getmp(qd)) == 0) return (0);
+      f = field_niceprime(m);
+      break;
+    case 2:
+      qd_delim(qd, ':');
+      if ((m = qd_getmp(qd)) == 0) return (0);
+      f = field_binpoly(m);
+      break;
+    default:
+      f = 0;
+      break;
+  }
+  mp_drop(m);
+  return (f);
+}
+
+/*----- That's all, folks -------------------------------------------------*/