code/trunk/pcre16_utf16_utils.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 a function for converting any UTF-16 character
strings to host byte order. */


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

/* Generate code with 16 bit character support. */
#define COMPILE_PCRE16

#include "pcre_internal.h"

/*************************************************
*  Convert any UTF-16 string to host byte order  *
*************************************************/

/* This function takes an UTF-16 string and converts
it to host byte order. The length can be explicitly set,
or autmatically detected for zero terminated strings.
BOMs can be kept or discarded during the conversion.
Conversion can be done in place (output == input).

Arguments:
  output     the output buffer, its size must be greater
             or equal than the input string
  input      any UTF-16 string
  length     the number of characters in the input string
             can be less than zero for zero terminated strings
  keep_boms  for a non-zero value, the BOM (0xfeff) characters
             are copied as well

Returns:     the number of characters placed into the output buffer,
             including the zero-terminator
*/

int
pcre16_utf16_to_host_byte_order(PCRE_SCHAR16 *output, PCRE_SPTR16 input, int length, int keep_boms)
{
#ifdef SUPPORT_UTF
/* This function converts any UTF-16 string to host byte order and optionally removes
any Byte Order Marks (BOMS). Returns with the remainig length. */
BOOL same_bo = TRUE;
pcre_uchar *optr = (pcre_uchar *)output;
const pcre_uchar *iptr = (const pcre_uchar *)input;
const pcre_uchar *end;
/* The c variable must be unsigned. */
register pcre_uchar c;

if (length < 0)
  length = STRLEN_UC(iptr) + 1;
end = iptr + length;

while (iptr < end)
  {
  c = *iptr++;
  if (c == 0xfeff || c == 0xfffe)
    {
    /* Detecting the byte order of the machine is unnecessary, it is
    enough to know that the UTF-16 string has the same byte order or not. */
    same_bo = c == 0xfeff;
    if (keep_boms != 0)
      *optr++ = 0xfeff;
    else
      length--;
    }
  else
    *optr++ = same_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
  }

#else /* SUPPORT_UTF */
(void)(output);  /* Keep picky compilers happy */
(void)(input);
(void)(keep_boms);
#endif /* SUPPORT_UTF */
return length;
}

/* End of pcre16_utf16_utils.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 a function for converting any UTF-16 character
42			strings to host byte order. */
43
44
45			#ifdef HAVE_CONFIG_H
46			#include "config.h"
47			#endif
48
49	zherczeg	782	/* Generate code with 16 bit character support. */
50			#define COMPILE_PCRE16
51
52	ph10	757	#include "pcre_internal.h"
53
54	zherczeg	789	/*************************************************
55			* Convert any UTF-16 string to host byte order *
56			*************************************************/
57
58			/* This function takes an UTF-16 string and converts
59			it to host byte order. The length can be explicitly set,
60			or autmatically detected for zero terminated strings.
61			BOMs can be kept or discarded during the conversion.
62			Conversion can be done in place (output == input).
63
64			Arguments:
65			output the output buffer, its size must be greater
66			or equal than the input string
67			input any UTF-16 string
68			length the number of characters in the input string
69			can be less than zero for zero terminated strings
70			keep_boms for a non-zero value, the BOM (0xfeff) characters
71			are copied as well
72
73			Returns: the number of characters placed into the output buffer,
74			including the zero-terminator
75			*/
76
77	ph10	757	int
78			pcre16_utf16_to_host_byte_order(PCRE_SCHAR16 *output, PCRE_SPTR16 input, int length, int keep_boms)
79			{
80	zherczeg	794	#ifdef SUPPORT_UTF
81	ph10	757	/* This function converts any UTF-16 string to host byte order and optionally removes
82			any Byte Order Marks (BOMS). Returns with the remainig length. */
83			BOOL same_bo = TRUE;
84	zherczeg	789	pcre_uchar optr = (pcre_uchar )output;
85			const pcre_uchar iptr = (const pcre_uchar )input;
86			const pcre_uchar *end;
87	ph10	757	/* The c variable must be unsigned. */
88	zherczeg	781	register pcre_uchar c;
89	ph10	757
90	zherczeg	789	if (length < 0)
91			length = STRLEN_UC(iptr) + 1;
92			end = iptr + length;
93
94			while (iptr < end)
95	ph10	757	{
96	zherczeg	789	c = *iptr++;
97	ph10	757	if (c == 0xfeff \|\| c == 0xfffe)
98			{
99			/* Detecting the byte order of the machine is unnecessary, it is
100			enough to know that the UTF-16 string has the same byte order or not. */
101			same_bo = c == 0xfeff;
102			if (keep_boms != 0)
103	zherczeg	789	*optr++ = 0xfeff;
104	ph10	757	else
105			length--;
106			}
107			else
108	zherczeg	789	optr++ = same_bo ? c : ((c >> 8) \| (c << 8)); / Flip bytes if needed. */
109	ph10	757	}
110
111	zherczeg	794	#else /* SUPPORT_UTF */
112	ph10	757	(void)(output); /* Keep picky compilers happy */
113			(void)(input);
114			(void)(keep_boms);
115	zherczeg	794	#endif /* SUPPORT_UTF */
116	ph10	757	return length;
117			}
118
119	zherczeg	764	/* End of pcre16_utf16_utils.c */