1 /*************************************************

     2 *      Perl-Compatible Regular Expressions       *

     3 *************************************************/

     4 

     5 /* PCRE is a library of functions to support regular expressions whose syntax

     6 and semantics are as close as possible to those of the Perl 5 language.

     7 

     8                        Written by Philip Hazel

     9            Copyright (c) 1997-2008 University of Cambridge

    10 

    11 -----------------------------------------------------------------------------

    12 Redistribution and use in source and binary forms, with or without

    13 modification, are permitted provided that the following conditions are met:

    14 

    15     * Redistributions of source code must retain the above copyright notice,

    16       this list of conditions and the following disclaimer.

    17 

    18     * Redistributions in binary form must reproduce the above copyright

    19       notice, this list of conditions and the following disclaimer in the

    20       documentation and/or other materials provided with the distribution.

    21 

    22     * Neither the name of the University of Cambridge nor the names of its

    23       contributors may be used to endorse or promote products derived from

    24       this software without specific prior written permission.

    25 

    26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

    30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    36 POSSIBILITY OF SUCH DAMAGE.

    37 -----------------------------------------------------------------------------

    38 */

    39 

    40 

    41 /* This module contains an internal function that is used to match an extended

    42 class (one that contains characters whose values are > 255). It is used by both

    43 pcre_exec() and pcre_def_exec(). */

    44 

    45 

    46 #ifdef HAVE_CONFIG_H

    47 #include "config.h"

    48 #endif

    49 

    50 #include "pcre_internal.h"

    51 

    52 

    53 /*************************************************

    54 *       Match character against an XCLASS        *

    55 *************************************************/

    56 

    57 /* This function is called to match a character against an extended class that

    58 might contain values > 255.

    59 

    60 Arguments:

    61   c           the character

    62   data        points to the flag byte of the XCLASS data

    63 

    64 Returns:      TRUE if character matches, else FALSE

    65 */

    66 

    67 BOOL

    68 _pcre_xclass(int c, const uschar *data)

    69 {

    70 int t;

    71 BOOL negated = (*data & XCL_NOT) != 0;

    72 

    73 /* Character values < 256 are matched against a bitmap, if one is present. If

    74 not, we still carry on, because there may be ranges that start below 256 in the

    75 additional data. */

    76 

    77 if (c < 256)

    78   {

    79   if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)

    80     return !negated;   /* char found */

    81   }

    82 

    83 /* First skip the bit map if present. Then match against the list of Unicode

    84 properties or large chars or ranges that end with a large char. We won't ever

    85 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */

    86 

    87 if ((*data++ & XCL_MAP) != 0) data += 32;

    88 

    89 while ((t = *data++) != XCL_END)

    90   {

    91   int x, y;

    92   if (t == XCL_SINGLE)

    93     {

    94     GETCHARINC(x, data);

    95     if (c == x) return !negated;

    96     }

    97   else if (t == XCL_RANGE)

    98     {

    99     GETCHARINC(x, data);

   100     GETCHARINC(y, data);

   101     if (c >= x && c <= y) return !negated;

   102     }

   103 

   104 #ifdef SUPPORT_UCP

   105   else  /* XCL_PROP & XCL_NOTPROP */

   106     {

   107     const ucd_record * prop = GET_UCD(c);

   108 

   109     switch(*data)

   110       {

   111       case PT_ANY:

   112       if (t == XCL_PROP) return !negated;

   113       break;

   114 

   115       case PT_LAMP:

   116       if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt) ==

   117           (t == XCL_PROP)) return !negated;

   118       break;

   119 

   120       case PT_GC:

   121       if ((data[1] == _pcre_ucp_gentype[prop->chartype]) == (t == XCL_PROP)) return !negated;

   122       break;

   123 

   124       case PT_PC:

   125       if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;

   126       break;

   127 

   128       case PT_SC:

   129       if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;

   130       break;

   131 

   132       /* This should never occur, but compilers may mutter if there is no

   133       default. */

   134 

   135       default:

   136       return FALSE;

   137       }

   138 

   139     data += 2;

   140     }

   141 #endif  /* SUPPORT_UCP */

   142   }

   143 

   144 return negated;   /* char did not match */

   145 }

   146 

   147 /* End of pcre_xclass.c */