/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	2.12k	{
43	17.0k	for (; (ssize_t) llen > 0; llen--)
44	15.6k	{
45	15.6k	int bc = uc_bidi_category (*label++);
46
47	15.6k	if (bc == UC_BIDI_R \|\| bc == UC_BIDI_AL \|\| bc == UC_BIDI_AN)
48	653	return 1;
49	15.6k	}
50
51	1.47k	return 0;
52	2.12k	}
53
54		/* IDNA2008 BIDI check (RFC 5893) */
55		int
56		_idn2_bidi (const uint32_t *label, size_t llen)
57	2.12k	{
58	2.12k	int bc;
59	2.12k	int endok = 1;
60
61	2.12k	if (!_isBidi (label, llen))
62	1.47k	return IDN2_OK;
63
64		// 2.1
65	653	switch ((bc = uc_bidi_category (*label)))
66	653	{
67	72	case UC_BIDI_L:
68		// check 2.5 & 2.6
69	2.07k	for (size_t it = 1; it < llen; it++)
70	2.07k	{
71	2.07k	bc = uc_bidi_category (label[it]);
72
73	2.07k	if (bc == UC_BIDI_L \|\| bc == UC_BIDI_EN \|\| bc == UC_BIDI_NSM)
74	1.45k	{
75	1.45k	endok = 1;
76	1.45k	}
77	615	else
78	615	{
79	615	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
80	267	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
81	72	{
82		/* printf("LTR label contains invalid code point\n"); */
83	72	return IDN2_BIDI;
84	72	}
85	543	endok = 0;
86	543	}
87	2.07k	}
88		/* printf("LTR label ends with invalid code point\n"); */
89	0	return endok ? IDN2_OK : IDN2_BIDI;
90
91	175	case UC_BIDI_R:
92	506	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	4.51k	for (size_t it = 1; it < llen; it++)
96	4.01k	{
97	4.01k	bc = uc_bidi_category (label[it]);
98
99		/* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
100	4.01k	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	3.45k	{
103	3.45k	endok = 1;
104	3.45k	}
105	561	else
106	561	{
107	561	if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
108	325	&& bc != UC_BIDI_ON && bc != UC_BIDI_BN)
109	6	{
110		/* printf("RTL label contains invalid code point\n"); */
111	6	return IDN2_BIDI;
112	6	}
113	555	endok = 0;
114	555	}
115	4.01k	}
116		/* printf("RTL label ends with invalid code point\n"); */
117	500	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	653	}
123	653	}

Coverage Report

Created: 2026-03-31 06:37