Coverage Report

Created: 2025-07-23 07:18

/src/libidn2/lib/bidi.c
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Source (jump to first uncovered line)
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/* bidi.c - IDNA right to left checking functions
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   Copyright (C) 2011-2025 Simon Josefsson
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   Libidn2 is free software: you can redistribute it and/or modify it
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   under the terms of either:
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     * the GNU Lesser General Public License as published by the Free
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       Software Foundation; either version 3 of the License, or (at
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       your option) any later version.
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   or
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     * the GNU General Public License as published by the Free
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       Software Foundation; either version 2 of the License, or (at
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       your option) any later version.
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   or both in parallel, as here.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received copies of the GNU General Public License and
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   the GNU Lesser General Public License along with this program.  If
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   not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "idn2.h"
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#include <sys/types.h>
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#include <stdbool.h>
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#include "bidi.h"
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#include <unictype.h>
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static bool
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_isBidi (const uint32_t *label, size_t llen)
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26.2k
{
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156k
  for (; (ssize_t) llen > 0; llen--)
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139k
    {
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139k
      int bc = uc_bidi_category (*label++);
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      if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_AN)
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9.24k
  return 1;
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    }
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16.9k
  return 0;
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}
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/* IDNA2008 BIDI check (RFC 5893) */
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int
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_idn2_bidi (const uint32_t *label, size_t llen)
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26.2k
{
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26.2k
  int bc;
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26.2k
  int endok = 1;
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26.2k
  if (!_isBidi (label, llen))
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16.9k
    return IDN2_OK;
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  // 2.1
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9.24k
  switch ((bc = uc_bidi_category (*label)))
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9.24k
    {
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1.22k
    case UC_BIDI_L:
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      // check 2.5 & 2.6
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10.1k
      for (size_t it = 1; it < llen; it++)
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10.1k
  {
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10.1k
    bc = uc_bidi_category (label[it]);
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10.1k
    if (bc == UC_BIDI_L || bc == UC_BIDI_EN || bc == UC_BIDI_NSM)
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7.54k
      {
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7.54k
        endok = 1;
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7.54k
      }
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2.61k
    else
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2.61k
      {
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2.61k
        if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
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2.61k
      && bc != UC_BIDI_ON && bc != UC_BIDI_BN)
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1.22k
    {
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      /* printf("LTR label contains invalid code point\n"); */
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1.22k
      return IDN2_BIDI;
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1.22k
    }
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        endok = 0;
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      }
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10.1k
  }
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      /* printf("LTR label ends with invalid code point\n"); */
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      return endok ? IDN2_OK : IDN2_BIDI;
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    case UC_BIDI_R:
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    case UC_BIDI_AL:
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      // check 2.2, 2.3, 2.4
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      /* printf("Label[0]=%04X: %s\n", label[0], uc_bidi_category_name(bc)); */
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      for (size_t it = 1; it < llen; it++)
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14.5k
  {
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14.5k
    bc = uc_bidi_category (label[it]);
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    /* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */
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    if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_EN
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        || bc == UC_BIDI_AN || bc == UC_BIDI_NSM)
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      {
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        endok = 1;
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      }
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    else
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2.77k
      {
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        if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET
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      && bc != UC_BIDI_ON && bc != UC_BIDI_BN)
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    {
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      /* printf("RTL label contains invalid code point\n"); */
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      return IDN2_BIDI;
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    }
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        endok = 0;
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      }
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  }
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      /* printf("RTL label ends with invalid code point\n"); */
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      return endok ? IDN2_OK : IDN2_BIDI;
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    default:
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      /* printf("Label begins with invalid BIDI class %s\n", uc_bidi_category_name(bc)); */
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      return IDN2_BIDI;
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    }
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}