chiark / gitweb /
math/f{25519,goldi}.[ch]: Export the piece type.
[catacomb] / math / group-string.c
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34e4f738 1/* -*-c-*-
34e4f738 2 *
3 * String I/O for group elements
4 *
5 * (c) 2004 Straylight/Edgeware
6 */
7
45c0fd36 8/*----- Licensing notice --------------------------------------------------*
34e4f738 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.
45c0fd36 16 *
34e4f738 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.
45c0fd36 21 *
34e4f738 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
34e4f738 28/*----- Header files ------------------------------------------------------*/
29
30#include "group.h"
31
32/*----- Main code ---------------------------------------------------------*/
33
34/* --- @group_readstring@ --- *
35 *
36 * Arguments: @group *g@ = an abstract group
37 * @ge *d@ = destination group element
38 * @const char *p@ = where the string is
39 * @char **end@ = where to put the end pointer
40 *
41 * Returns: Zero on success, nonzero on failure.
42 *
43 * Use: Parses a group element from a string.
44 */
45
46int group_readstring(group *g, ge *d, const char *p, char **end)
47{
48 mptext_stringctx ms;
49
50 ms.buf = (/*unconst*/ char *)p;
51 ms.lim = (/*unconst*/ char *)p + strlen(p);
52 if (G_READ(g, d, &mptext_stringops, &ms))
53 return (-1);
54 if (end) *end = ms.buf;
55 return (0);
56}
57
58/* --- @group_writestring@ --- *
59 *
60 * Arguments: @group *g@ = an abstract group
61 * @ge *x@ = a group element
62 * @char *p@ = where the string should go
63 * @size_t sz@ = how long the buffer is
64 *
65 * Returns: Zero on success, nonzero on failure.
66 *
67 * Use: Writes a group element to a string buffer.
68 */
69
70int group_writestring(group *g, ge *x, char *p, size_t sz)
71{
72 mptext_stringctx ms;
73
74 ms.buf = p;
75 ms.lim = p + sz - 1;
76 if (G_WRITE(g, x, &mptext_stringops, &ms))
77 return (-1);
78 *ms.buf = 0;
79 return (0);
80}
81
82/*----- That's all, folks -------------------------------------------------*/