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    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) 1997-2012 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 /* Generate code with 16 bit character support. */
   50 #define COMPILE_PCRE16
   51 
   52 #include "pcre_internal.h"
   53 
   54 /*************************************************
   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 automatically 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 16-bit units in the input string
   69              can be less than zero for zero terminated strings
   70   host_byte_order
   71              A non-zero value means the input is in host byte
   72              order, which can be dynamically changed by BOMs later.
   73              Initially it contains the starting byte order and returns
   74              with the last byte order so it can be used for stream
   75              processing. It can be NULL, which set the host byte
   76              order mode by default.
   77   keep_boms  for a non-zero value, the BOM (0xfeff) characters
   78              are copied as well
   79 
   80 Returns:     the number of 16-bit units placed into the output buffer,
   81              including the zero-terminator
   82 */
   83 
   84 int
   85 pcre16_utf16_to_host_byte_order(PCRE_UCHAR16 *output, PCRE_SPTR16 input,
   86   int length, int *host_byte_order, int keep_boms)
   87 {
   88 #ifdef SUPPORT_UTF
   89 /* This function converts any UTF-16 string to host byte order and optionally
   90 removes any Byte Order Marks (BOMS). Returns with the remainig length. */
   91 int host_bo = host_byte_order != NULL ? *host_byte_order : 1;
   92 pcre_uchar *optr = (pcre_uchar *)output;
   93 const pcre_uchar *iptr = (const pcre_uchar *)input;
   94 const pcre_uchar *end;
   95 /* The c variable must be unsigned. */
   96 register pcre_uchar c;
   97 
   98 if (length < 0)
   99   length = STRLEN_UC(iptr) + 1;
  100 end = iptr + length;
  101 
  102 while (iptr < end)
  103   {
  104   c = *iptr++;
  105   if (c == 0xfeff || c == 0xfffe)
  106     {
  107     /* Detecting the byte order of the machine is unnecessary, it is
  108     enough to know that the UTF-16 string has the same byte order or not. */
  109     host_bo = c == 0xfeff;
  110     if (keep_boms != 0)
  111       *optr++ = 0xfeff;
  112     else
  113       length--;
  114     }
  115   else
  116     *optr++ = host_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
  117   }
  118 if (host_byte_order != NULL)
  119   *host_byte_order = host_bo;
  120 
  121 #else /* Not SUPPORT_UTF */
  122 (void)(output);  /* Keep picky compilers happy */
  123 (void)(input);
  124 (void)(keep_boms);
  125 (void)(host_byte_order);
  126 #endif /* SUPPORT_UTF */
  127 return length;
  128 }
  129 
  130 /* End of pcre16_utf16_utils.c */