/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	2.04k	{
43	17.4k	for (; (ssize_t) llen > 0; llen--)
44	16.0k	{
45	16.0k	int bc = uc_bidi_category (*label++);
46
47	16.0k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_AN)
48	607	return 1;
49	16.0k	}
50
51	1.43k	return 0;
52	2.04k	}
53
54		/* IDNA2008 BIDI check (RFC 5893) */
55		int
56		_idn2_bidi (const uint32_t *label, size_t llen)
57	2.04k	{
58	2.04k	int bc;
59	2.04k	int endok = 1;
60
61	2.04k	if (!_isBidi (label, llen))
62	1.43k	return IDN2_OK;
63
64		// 2.1
65	607	switch ((bc = uc_bidi_category (*label)))
66	607	{
67	69	case UC_BIDI_L:
68		// check 2.5 & 2.6
69	1.79k	for (size_t it = 1; it < llen; it++)
70	1.79k	{
71	1.79k	bc = uc_bidi_category (label[it]);
72
73	1.79k	if (bc == UC_BIDI_L \|\| bc == UC_BIDI_EN \|\| bc == UC_BIDI_NSM)
74	1.31k	{
75	1.31k	endok = 1;
76	1.31k	}
77	482	else
78	482	{
79	482	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
80	265	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
81	69	{
82		/* printf("LTR label contains invalid code point\n"); */
83	69	return IDN2_BIDI;
84	69	}
85	413	endok = 0;
86	413	}
87	1.79k	}
88		/* printf("LTR label ends with invalid code point\n"); */
89	0	return endok ? IDN2_OK : IDN2_BIDI;
90
91	196	case UC_BIDI_R:
92	463	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	4.28k	{
97	4.28k	bc = uc_bidi_category (label[it]);
98
99		/* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
100	4.28k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_EN
101	2.35k	\|\| bc == UC_BIDI_AN \|\| bc == UC_BIDI_NSM)
102	3.73k	{
103	3.73k	endok = 1;
104	3.73k	}
105	545	else
106	545	{
107	545	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
108	329	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
109	10	{
110		/* printf("RTL label contains invalid code point\n"); */
111	10	return IDN2_BIDI;
112	10	}
113	535	endok = 0;
114	535	}
115	4.28k	}
116		/* printf("RTL label ends with invalid code point\n"); */
117	453	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	607	}
123	607	}

Coverage Report

Created: 2026-05-16 06:52