code/trunk/pcre16_valid_utf16.c

/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
           Copyright (c) 1997-2009 University of Cambridge

-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/


/* This module contains an internal function for validating UTF-16 character
strings. */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "pcre_internal.h"


/*************************************************
*         Validate a UTF-16 string                *
*************************************************/

/* This function is called (optionally) at the start of compile or match, to
check that a supposed UTF-16 string is actually valid. The early check means
that subsequent code can assume it is dealing with a valid string. The check
can be turned off for maximum performance, but the consequences of supplying an
invalid string are then undefined.

From release 8.21 more information about the details of the error are passed
back in the returned value:

PCRE_UTF16_ERR0  No error
PCRE_UTF16_ERR1  Missing low surrogate at the end of the string
PCRE_UTF16_ERR2  Invalid low surrogate
PCRE_UTF16_ERR3  Isolated low surrogate
PCRE_UTF16_ERR4  Not allowed character

Arguments:
  string       points to the string
  length       length of string, or -1 if the string is zero-terminated
  errp         pointer to an error position offset variable

Returns:       = 0    if the string is a valid UTF-16 string
               > 0    otherwise, setting the offset of the bad character
*/

int
PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
{
#ifdef SUPPORT_UTF16
register PCRE_PUCHAR p;
register pcre_uchar c;

if (length < 0)
  {
  for (p = string; *p != 0; p++);
  length = p - string;
  }

for (p = string; length-- > 0; p++)
  {
  c = *p;

  if ((c & 0xf800) != 0xd800)
    {
    /* Normal UTF-16 code point. Neither high nor low surrogate. */

    /* This is probably a BOM from a different byte-order.
    Regardless, the string is rejected. */
    if (c == 0xfffe)
      {
      *erroroffset = p - string;
      return PCRE_UTF16_ERR4;
      }
    }
  else if ((c & 0x0400) == 0)
    {
    /* High surrogate. */

    /* Must be a followed by a low surrogate. */
    if (length == 0)
      {
      *erroroffset = p - string;
      return PCRE_UTF16_ERR1;
      }
    p++;
    length--;
    if ((*p & 0xfc00) != 0xdc00)
      {
      *erroroffset = p - string;
      return PCRE_UTF16_ERR2;
      }
    }
  else
    {
    /* Isolated low surrogate. Always an error. */
    *erroroffset = p - string;
    return PCRE_UTF16_ERR3;
    }
  }

#else  /* SUPPORT_UTF16 */
(void)(string);  /* Keep picky compilers happy */
(void)(length);
#endif

return PCRE_UTF16_ERR0;   /* This indicates success */
}

/* End of pcre16_valid_utf16.c */
1	ph10	757	/*************************************************
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) 1997-2009 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 for validating UTF-16 character
42			strings. */
43
44
45			#ifdef HAVE_CONFIG_H
46			#include "config.h"
47			#endif
48
49			#include "pcre_internal.h"
50
51
52			/*************************************************
53			* Validate a UTF-16 string *
54			*************************************************/
55
56			/* This function is called (optionally) at the start of compile or match, to
57			check that a supposed UTF-16 string is actually valid. The early check means
58			that subsequent code can assume it is dealing with a valid string. The check
59			can be turned off for maximum performance, but the consequences of supplying an
60			invalid string are then undefined.
61
62			From release 8.21 more information about the details of the error are passed
63			back in the returned value:
64
65			PCRE_UTF16_ERR0 No error
66			PCRE_UTF16_ERR1 Missing low surrogate at the end of the string
67			PCRE_UTF16_ERR2 Invalid low surrogate
68			PCRE_UTF16_ERR3 Isolated low surrogate
69	zherczeg	764	PCRE_UTF16_ERR4 Not allowed character
70	ph10	757
71			Arguments:
72			string points to the string
73			length length of string, or -1 if the string is zero-terminated
74			errp pointer to an error position offset variable
75
76			Returns: = 0 if the string is a valid UTF-16 string
77			> 0 otherwise, setting the offset of the bad character
78			*/
79
80			int
81	zherczeg	781	PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
82	ph10	757	{
83			#ifdef SUPPORT_UTF16
84	zherczeg	763	register PCRE_PUCHAR p;
85	zherczeg	781	register pcre_uchar c;
86	ph10	757
87			if (length < 0)
88			{
89			for (p = string; *p != 0; p++);
90			length = p - string;
91			}
92
93			for (p = string; length-- > 0; p++)
94			{
95			c = *p;
96
97			if ((c & 0xf800) != 0xd800)
98			{
99			/* Normal UTF-16 code point. Neither high nor low surrogate. */
100
101			/* This is probably a BOM from a different byte-order.
102			Regardless, the string is rejected. */
103			if (c == 0xfffe)
104			{
105			*erroroffset = p - string;
106			return PCRE_UTF16_ERR4;
107			}
108			}
109			else if ((c & 0x0400) == 0)
110			{
111			/* High surrogate. */
112
113			/* Must be a followed by a low surrogate. */
114			if (length == 0)
115			{
116			*erroroffset = p - string;
117			return PCRE_UTF16_ERR1;
118			}
119			p++;
120			length--;
121			if ((*p & 0xfc00) != 0xdc00)
122			{
123			*erroroffset = p - string;
124			return PCRE_UTF16_ERR2;
125			}
126			}
127			else
128			{
129			/* Isolated low surrogate. Always an error. */
130			*erroroffset = p - string;
131			return PCRE_UTF16_ERR3;
132			}
133			}
134
135			#else /* SUPPORT_UTF16 */
136			(void)(string); /* Keep picky compilers happy */
137			(void)(length);
138			#endif
139
140			return PCRE_UTF16_ERR0; /* This indicates success */
141			}
142
143			/* End of pcre16_valid_utf16.c */