/* This is JavaScriptCore's variant of the PCRE library. While this library

started out as a copy of PCRE, many of the features of PCRE have been

removed. This library now supports only the regular expression features

required by the JavaScript language specification, and has only the functions

needed by JavaScriptCore and the rest of WebKit.

                 Originally written by Philip Hazel

           Copyright (c) 1997-2006 University of Cambridge

    Copyright (C) 2002, 2004, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.

-----------------------------------------------------------------------------

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 that is used to match an extended

class (one that contains characters whose values are > 255). */

#include "config.h"

#include "pcre_internal.h"

/*************************************************

*       Match character against an XCLASS        *

*************************************************/

/* This function is called to match a character against an extended class that

might contain values > 255.

Arguments:

  c           the character

  data        points to the flag byte of the XCLASS data

Returns:      true if character matches, else false

*/

/* Get the next UTF-8 character, advancing the pointer. This is called when we

 know we are in UTF-8 mode. */

static inline void getUTF8CharAndAdvancePointer(int& c, const unsigned char*& subjectPtr)

{

    c = *subjectPtr++;

    if ((c & 0xc0) == 0xc0) {

        int gcaa = jsc_pcre_utf8_table4[c & 0x3f];  /* Number of additional bytes */

        int gcss = 6 * gcaa;

        c = (c & jsc_pcre_utf8_table3[gcaa]) << gcss;

        while (gcaa-- > 0) {

            gcss -= 6;

            c |= (*subjectPtr++ & 0x3f) << gcss;

        }

    }

}

bool jsc_pcre_xclass(int c, const unsigned char* data)

{

    bool negated = (*data & XCL_NOT);

    /* Character values < 256 are matched against a bitmap, if one is present. If

     not, we still carry on, because there may be ranges that start below 256 in the

     additional data. */

    if (c < 256) {

        if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)

            return !negated;   /* char found */

    }

    /* First skip the bit map if present. Then match against the list of Unicode

     properties or large chars or ranges that end with a large char. We won't ever

     encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */

    if ((*data++ & XCL_MAP) != 0)

        data += 32;

    int t;

    while ((t = *data++) != XCL_END) {

        if (t == XCL_SINGLE) {

            int x;

            getUTF8CharAndAdvancePointer(x, data);

            if (c == x)

                return !negated;

        }

        else if (t == XCL_RANGE) {

            int x, y;

            getUTF8CharAndAdvancePointer(x, data);

            getUTF8CharAndAdvancePointer(y, data);

            if (c >= x && c <= y)

                return !negated;

        }

    }

    return negated;   /* char did not match */

}