/src/libidn2/lib/bidi.c

Source
/* bidi.c - IDNA right to left checking functions
   Copyright (C) 2011-2025 Simon Josefsson

   Libidn2 is free software: you can redistribute it and/or modify it
   under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at
       your option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at
       your option) any later version.

   or both in parallel, as here.

   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 General Public License for more details.

   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#include "idn2.h"

#include <sys/types.h>
#include <stdbool.h>

#include "bidi.h"

#include <unictype.h>

static bool
_isBidi (const uint32_t *label, size_t llen)
{
  for (; (ssize_t) llen > 0; llen--)
    {
      int bc = uc_bidi_category (*label++);

      if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_AN)
  return 1;
    }

  return 0;
}

/* IDNA2008 BIDI check (RFC 5893) */
int
_idn2_bidi (const uint32_t *label, size_t llen)
{
  int bc;
  int endok = 1;

  if (!_isBidi (label, llen))
    return IDN2_OK;

  // 2.1
  switch ((bc = uc_bidi_category (*label)))
    {
    case UC_BIDI_L:
      // check 2.5 & 2.6
      for (size_t it = 1; it < llen; it++)
  {
    bc = uc_bidi_category (label[it]);

    if (bc == UC_BIDI_L || bc == UC_BIDI_EN || bc == UC_BIDI_NSM)
      {
        endok = 1;
      }
    else
      {
        if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
      && bc != UC_BIDI_ON && bc != UC_BIDI_BN)
    {
      /* printf("LTR label contains invalid code point\n"); */
      return IDN2_BIDI;
    }
        endok = 0;
      }
  }
      /* printf("LTR label ends with invalid code point\n"); */
      return endok ? IDN2_OK : IDN2_BIDI;

    case UC_BIDI_R:
    case UC_BIDI_AL:
      // check 2.2, 2.3, 2.4
      /* printf("Label[0]=%04X: %s\n", label[0], uc_bidi_category_name(bc)); */
      for (size_t it = 1; it < llen; it++)
  {
    bc = uc_bidi_category (label[it]);

    /* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
    if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_EN
        || bc == UC_BIDI_AN || bc == UC_BIDI_NSM)
      {
        endok = 1;
      }
    else
      {
        if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
      && bc != UC_BIDI_ON && bc != UC_BIDI_BN)
    {
      /* printf("RTL label contains invalid code point\n"); */
      return IDN2_BIDI;
    }
        endok = 0;
      }
  }
      /* printf("RTL label ends with invalid code point\n"); */
      return endok ? IDN2_OK : IDN2_BIDI;

    default:
      /* printf("Label begins with invalid BIDI class %s\n", uc_bidi_category_name(bc)); */
      return IDN2_BIDI;
    }
}

Line	Count	Source
1		/* bidi.c - IDNA right to left checking functions
2		Copyright (C) 2011-2025 Simon Josefsson
3
4		Libidn2 is free software: you can redistribute it and/or modify it
5		under the terms of either:
6
7		* the GNU Lesser General Public License as published by the Free
8		Software Foundation; either version 3 of the License, or (at
9		your option) any later version.
10
11		or
12
13		* the GNU General Public License as published by the Free
14		Software Foundation; either version 2 of the License, or (at
15		your option) any later version.
16
17		or both in parallel, as here.
18
19		This program 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 General Public License for more details.
23
24		You should have received copies of the GNU General Public License and
25		the GNU Lesser General Public License along with this program. If
26		not, see <http://www.gnu.org/licenses/>.
27		*/
28
29		#include <config.h>
30
31		#include "idn2.h"
32
33		#include <sys/types.h>
34		#include <stdbool.h>
35
36		#include "bidi.h"
37
38		#include <unictype.h>
39
40		static bool
41		_isBidi (const uint32_t *label, size_t llen)
42	2.05k	{
43	17.7k	for (; (ssize_t) llen > 0; llen--)
44	16.2k	{
45	16.2k	int bc = uc_bidi_category (*label++);
46
47	16.2k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_AN)
48	629	return 1;
49	16.2k	}
50
51	1.42k	return 0;
52	2.05k	}
53
54		/* IDNA2008 BIDI check (RFC 5893) */
55		int
56		_idn2_bidi (const uint32_t *label, size_t llen)
57	2.05k	{
58	2.05k	int bc;
59	2.05k	int endok = 1;
60
61	2.05k	if (!_isBidi (label, llen))
62	1.42k	return IDN2_OK;
63
64		// 2.1
65	629	switch ((bc = uc_bidi_category (*label)))
66	629	{
67	65	case UC_BIDI_L:
68		// check 2.5 & 2.6
69	1.59k	for (size_t it = 1; it < llen; it++)
70	1.59k	{
71	1.59k	bc = uc_bidi_category (label[it]);
72
73	1.59k	if (bc == UC_BIDI_L \|\| bc == UC_BIDI_EN \|\| bc == UC_BIDI_NSM)
74	1.12k	{
75	1.12k	endok = 1;
76	1.12k	}
77	461	else
78	461	{
79	461	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
80	260	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
81	65	{
82		/* printf("LTR label contains invalid code point\n"); */
83	65	return IDN2_BIDI;
84	65	}
85	396	endok = 0;
86	396	}
87	1.59k	}
88		/* printf("LTR label ends with invalid code point\n"); */
89	0	return endok ? IDN2_OK : IDN2_BIDI;
90
91	203	case UC_BIDI_R:
92	486	case UC_BIDI_AL:
93		// check 2.2, 2.3, 2.4
94		/* printf("Label[0]=%04X: %s\n", label[0], uc_bidi_category_name(bc)); */
95	4.73k	for (size_t it = 1; it < llen; it++)
96	4.25k	{
97	4.25k	bc = uc_bidi_category (label[it]);
98
99		/* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
100	4.25k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_EN
101	2.18k	\|\| bc == UC_BIDI_AN \|\| bc == UC_BIDI_NSM)
102	3.71k	{
103	3.71k	endok = 1;
104	3.71k	}
105	540	else
106	540	{
107	540	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
108	328	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
109	8	{
110		/* printf("RTL label contains invalid code point\n"); */
111	8	return IDN2_BIDI;
112	8	}
113	532	endok = 0;
114	532	}
115	4.25k	}
116		/* printf("RTL label ends with invalid code point\n"); */
117	478	return endok ? IDN2_OK : IDN2_BIDI;
118
119	78	default:
120		/* printf("Label begins with invalid BIDI class %s\n", uc_bidi_category_name(bc)); */
121	78	return IDN2_BIDI;
122	629	}
123	629	}

Coverage Report

Created: 2026-08-14 07:10