3 * $Id: group-dstr.c,v 1.1 2004/04/01 12:50:09 mdw Exp $
5 * Dynamic string I/O for group elements
7 * (c) 2004 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: group-dstr.c,v $
33 * Revision 1.1 2004/04/01 12:50:09 mdw
34 * Add cyclic group abstraction, with test code. Separate off exponentation
35 * functions for better static linking. Fix a buttload of bugs on the way.
36 * Generally ensure that negative exponents do inversion correctly. Add
37 * table of standard prime-field subgroups. (Binary field subgroups are
38 * currently unimplemented but easy to add if anyone ever finds a good one.)
42 /*----- Header files ------------------------------------------------------*/
46 /*----- Main code ---------------------------------------------------------*/
48 /* --- @group_readdstr@ --- *
50 * Arguments: @group *g@ = an abstract group
51 * @ge *d@ = destination group element
52 * @dstr *dd@ = string to read from
53 * @size_t *off@ = offset to start at (updated)
55 * Returns: Zero on success, nonzero on failure.
57 * Use: Parses a group element from a dynamic string.
60 int group_readdstr(group
*g
, ge
*d
, dstr
*dd
, size_t *off
)
65 md
.i
= off ?
*off
: 0;
66 if (G_READ(g
, d
, &mptext_dstrops
, &md
))
72 /* --- @group_writedstr@ --- *
74 * Arguments: @group *g@ = an abstract group
75 * @ge *x@ = a group element
76 * @dstr *d@ = string to write to
77 * @size_t sz@ = how long the buffer is
79 * Returns: Zero on success, nonzero on failure.
81 * Use: Writes a group element to a dstr buffer.
84 int group_writedstr(group
*g
, ge
*x
, dstr
*d
)
89 if (G_WRITE(g
, x
, &mptext_dstrops
, &md
))
97 /*----- That's all, folks -------------------------------------------------*/