Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxhttp.h"

​

#include "zbxstr.h"

#include "punycode.h"

​

/******************************************************************************

 *                                                                            *

 * Purpose: after each delta is encoded or decoded, bias should be set for    *

 *          the next delta (should be adapted)                                *

 *                                                                            *

 * Parameters: delta      - [IN] punycode delta (generalized variable-length  *

 *                               integer)                                     *

 *             count      - [IN] is the total number of code points encoded / *

 *                               decoded so far                               *

 *             divisor    - [IN] delta divisor (to avoid overflow)            *

 *                                                                            *

 * Return value: adapted bias                                                 *

 *                                                                            *

 ******************************************************************************/

static zbx_uint32_t punycode_adapt(zbx_uint32_t delta, int count, int divisor)

{

    zbx_uint32_t    i;

​

    delta /= divisor;

    delta += delta / count;

​

    for (i = 0; PUNYCODE_BIAS_LIMIT < delta; i += PUNYCODE_BASE)

        delta /= PUNYCODE_BASE_MAX;

​

    return ((PUNYCODE_BASE * delta) / (delta + PUNYCODE_SKEW)) + i;

}

​

/******************************************************************************

 *                                                                            *

 * Purpose: encodes punycode digit into ansi character [a-z0-9]               *

 *                                                                            *

 * Parameters: digit      - [IN] digit to encode                              *

 *                                                                            *

 * Return value: encoded character                                            *

 *                                                                            *

 ******************************************************************************/

static char punycode_encode_digit(int digit)

{

    if (0 <= digit && 25 >= digit)

        return digit + 'a';

    else if (25 < digit && PUNYCODE_BASE > digit)

        return digit + 22;

​

    THIS_SHOULD_NEVER_HAPPEN;