/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	17.6k	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	668	return 1;
49	16.2k	}
50
51	1.38k	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	1.38k	return IDN2_OK;
63
64		// 2.1
65	668	switch ((bc = uc_bidi_category (*label)))
66	668	{
67	71	case UC_BIDI_L:
68		// check 2.5 & 2.6
69	1.61k	for (size_t it = 1; it < llen; it++)
70	1.61k	{
71	1.61k	bc = uc_bidi_category (label[it]);
72
73	1.61k	if (bc == UC_BIDI_L \|\| bc == UC_BIDI_EN \|\| bc == UC_BIDI_NSM)
74	1.14k	{
75	1.14k	endok = 1;
76	1.14k	}
77	467	else
78	467	{
79	467	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
80	266	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
81	71	{
82		/* printf("LTR label contains invalid code point\n"); */
83	71	return IDN2_BIDI;
84	71	}
85	396	endok = 0;
86	396	}
87	1.61k	}
88		/* printf("LTR label ends with invalid code point\n"); */
89	0	return endok ? IDN2_OK : IDN2_BIDI;
90
91	171	case UC_BIDI_R:
92	522	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	4.92k	for (size_t it = 1; it < llen; it++)
96	4.41k	{
97	4.41k	bc = uc_bidi_category (label[it]);
98
99		/* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
100	4.41k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_EN
101	2.13k	\|\| bc == UC_BIDI_AN \|\| bc == UC_BIDI_NSM)
102	3.87k	{
103	3.87k	endok = 1;
104	3.87k	}
105	545	else
106	545	{
107	545	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
108	332	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
109	12	{
110		/* printf("RTL label contains invalid code point\n"); */
111	12	return IDN2_BIDI;
112	12	}
113	533	endok = 0;
114	533	}
115	4.41k	}
116		/* printf("RTL label ends with invalid code point\n"); */
117	510	return endok ? IDN2_OK : IDN2_BIDI;
118
119	75	default:
120		/* printf("Label begins with invalid BIDI class %s\n", uc_bidi_category_name(bc)); */
121	75	return IDN2_BIDI;
122	668	}
123	668	}

Coverage Report

Created: 2026-09-28 06:58