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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 */