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/* server.c --- DIGEST-MD5 mechanism from RFC 2831, server side.
* Copyright (C) 2002-2025 Simon Josefsson
*
* This file is part of GNU SASL Library.
*
* GNU SASL Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GNU SASL Library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GNU SASL Library; if not, see
* <https://www.gnu.org/licenses/>.
*
*/
#include <config.h>
/* Get specification. */
#include "nonascii.h"
#include <stdlib.h>
#include <string.h>
/* C89 compliant way to cast 'char' to 'unsigned char'. */
static inline unsigned char
to_uchar (char ch)
{
return ch;
}
char *
latin1toutf8 (const char *str)
{
char *p = malloc (2 * strlen (str) + 1);
if (p)
{
size_t i, j = 0;
for (i = 0; str[i]; i++)
{
if (to_uchar (str[i]) < 0x80)
p[j++] = str[i];
else if (to_uchar (str[i]) < 0xC0)
{
p[j++] = (unsigned char) 0xC2;
p[j++] = str[i];
}
else
{
p[j++] = (unsigned char) 0xC3;
p[j++] = str[i] - 64;
}
}
p[j] = 0x00;
}
return p;
}
char *
utf8tolatin1ifpossible (const char *passwd)
{
char *p;
size_t i;
for (i = 0; passwd[i]; i++)
{
if (to_uchar (passwd[i]) > 0x7F)
{
if (to_uchar (passwd[i]) < 0xC0 || to_uchar (passwd[i]) > 0xC3)
return strdup (passwd);
i++;
if (to_uchar (passwd[i]) < 0x80 || to_uchar (passwd[i]) > 0xBF)
return strdup (passwd);
}
}
p = malloc (strlen (passwd) + 1);
if (p)
{
size_t j = 0;
for (i = 0; passwd[i]; i++)
{
if (to_uchar (passwd[i]) > 0x7F)
{
/* p[i+1] can't be zero here */
p[j++] =
((to_uchar (passwd[i]) & 0x3) << 6)
| (to_uchar (passwd[i + 1]) & 0x3F);
i++;
}
else
p[j++] = passwd[i];
}
p[j] = 0x00;
}
return p;
}
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