1/*************************************************
2*      Perl-Compatible Regular Expressions       *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8                       Written by Philip Hazel
9           Copyright (c) 1997-2009 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, 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
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This module contains an internal function that is used to match an extended
42class. It is used by both pcre_exec() and pcre_def_exec(). */
43
44
45#ifdef HAVE_CONFIG_H
46#include "config.h"
47#endif
48
49#include "pcre_internal.h"
50
51
52/*************************************************
53*       Match character against an XCLASS        *
54*************************************************/
55
56/* This function is called to match a character against an extended class that
57might contain values > 255 and/or Unicode properties.
58
59Arguments:
60  c           the character
61  data        points to the flag byte of the XCLASS data
62
63Returns:      TRUE if character matches, else FALSE
64*/
65
66BOOL
67_pcre_xclass(int c, const uschar *data)
68{
69int t;
70BOOL negated = (*data & XCL_NOT) != 0;
71
72/* Character values < 256 are matched against a bitmap, if one is present. If
73not, we still carry on, because there may be ranges that start below 256 in the
74additional data. */
75
76if (c < 256)
77  {
78  if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
79    return !negated;   /* char found */
80  }
81
82/* First skip the bit map if present. Then match against the list of Unicode
83properties or large chars or ranges that end with a large char. We won't ever
84encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
85
86if ((*data++ & XCL_MAP) != 0) data += 32;
87
88while ((t = *data++) != XCL_END)
89  {
90  int x, y;
91  if (t == XCL_SINGLE)
92    {
93    GETCHARINC(x, data);
94    if (c == x) return !negated;
95    }
96  else if (t == XCL_RANGE)
97    {
98    GETCHARINC(x, data);
99    GETCHARINC(y, data);
100    if (c >= x && c <= y) return !negated;
101    }
102
103#ifdef SUPPORT_UCP
104  else  /* XCL_PROP & XCL_NOTPROP */
105    {
106    const ucd_record *prop = GET_UCD(c);
107
108    switch(*data)
109      {
110      case PT_ANY:
111      if (t == XCL_PROP) return !negated;
112      break;
113
114      case PT_LAMP:
115      if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt) ==
116          (t == XCL_PROP)) return !negated;
117      break;
118
119      case PT_GC:
120      if ((data[1] == _pcre_ucp_gentype[prop->chartype]) == (t == XCL_PROP)) return !negated;
121      break;
122
123      case PT_PC:
124      if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
125      break;
126
127      case PT_SC:
128      if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
129      break;
130
131      /* This should never occur, but compilers may mutter if there is no
132      default. */
133
134      default:
135      return FALSE;
136      }
137
138    data += 2;
139    }
140#endif  /* SUPPORT_UCP */
141  }
142
143return negated;   /* char did not match */
144}
145
146/* End of pcre_xclass.c */
147