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|
/* $Id: utf-16-case.cpp $ */
/** @file
* IPRT - UTF-16, Case Sensitivity.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/utf16.h>
#include "internal/iprt.h"
#include <iprt/uni.h>
#include <iprt/alloc.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include "internal/string.h"
RTDECL(int) RTUtf16ICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2)
{
if (pwsz1 == pwsz2)
return 0;
if (!pwsz1)
return -1;
if (!pwsz2)
return 1;
PCRTUTF16 pwsz1Start = pwsz1; /* keep it around in case we have to backtrack on a surrogate pair */
for (;;)
{
RTUTF16 wc1 = *pwsz1;
RTUTF16 wc2 = *pwsz2;
int iDiff = wc1 - wc2;
if (iDiff)
{
/* unless they are *both* surrogate pairs, there is no chance they'll be identical. */
if ( wc1 < 0xd800
|| wc2 < 0xd800
|| wc1 > 0xdfff
|| wc2 > 0xdfff)
{
/* simple UCS-2 char */
iDiff = RTUniCpToUpper(wc1) - RTUniCpToUpper(wc2);
if (iDiff)
iDiff = RTUniCpToLower(wc1) - RTUniCpToLower(wc2);
}
else
{
/* a damned pair */
RTUNICP uc1;
RTUNICP uc2;
if (wc1 >= 0xdc00)
{
if (pwsz1Start == pwsz1)
return iDiff;
uc1 = pwsz1[-1];
if (uc1 < 0xd800 || uc1 >= 0xdc00)
return iDiff;
uc1 = 0x10000 + (((uc1 & 0x3ff) << 10) | (wc1 & 0x3ff));
uc2 = 0x10000 + (((pwsz2[-1] & 0x3ff) << 10) | (wc2 & 0x3ff));
}
else
{
uc1 = *++pwsz1;
if (uc1 < 0xdc00 || uc1 >= 0xe000)
return iDiff;
uc1 = 0x10000 + (((wc1 & 0x3ff) << 10) | (uc1 & 0x3ff));
uc2 = 0x10000 + (((wc2 & 0x3ff) << 10) | (*++pwsz2 & 0x3ff));
}
iDiff = RTUniCpToUpper(uc1) - RTUniCpToUpper(uc2);
if (iDiff)
iDiff = RTUniCpToLower(uc1) - RTUniCpToLower(uc2); /* serious paranoia! */
}
if (iDiff)
return iDiff;
}
if (!wc1)
return 0;
pwsz1++;
pwsz2++;
}
}
RT_EXPORT_SYMBOL(RTUtf16ICmp);
RTDECL(int) RTUtf16BigICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2)
{
if (pwsz1 == pwsz2)
return 0;
if (!pwsz1)
return -1;
if (!pwsz2)
return 1;
PCRTUTF16 pwsz1Start = pwsz1; /* keep it around in case we have to backtrack on a surrogate pair */
for (;;)
{
RTUTF16 wc1 = *pwsz1;
RTUTF16 wc2 = *pwsz2;
int iDiff = wc1 - wc2;
if (iDiff)
{
/* unless they are *both* surrogate pairs, there is no chance they'll be identical. */
wc1 = RT_BE2H_U16(wc1);
wc2 = RT_BE2H_U16(wc2);
if ( wc1 < 0xd800
|| wc2 < 0xd800
|| wc1 > 0xdfff
|| wc2 > 0xdfff)
{
/* simple UCS-2 char */
iDiff = RTUniCpToUpper(wc1) - RTUniCpToUpper(wc2);
if (iDiff)
iDiff = RTUniCpToLower(wc1) - RTUniCpToLower(wc2);
}
else
{
/* a damned pair */
RTUNICP uc1;
RTUNICP uc2;
if (wc1 >= 0xdc00)
{
if (pwsz1Start == pwsz1)
return iDiff;
uc1 = RT_BE2H_U16(pwsz1[-1]);
if (uc1 < 0xd800 || uc1 >= 0xdc00)
return iDiff;
uc1 = 0x10000 + (((uc1 & 0x3ff) << 10) | (wc1 & 0x3ff));
uc2 = 0x10000 + (((RT_BE2H_U16(pwsz2[-1]) & 0x3ff) << 10) | (wc2 & 0x3ff));
}
else
{
RTUTF16 wcTmp = *++pwsz1;
uc1 = RT_BE2H_U16(wcTmp);
if (uc1 < 0xdc00 || uc1 >= 0xe000)
return iDiff;
uc1 = 0x10000 + (((wc1 & 0x3ff) << 10) | (uc1 & 0x3ff));
wcTmp = *++pwsz2;
uc2 = 0x10000 + (((wc2 & 0x3ff) << 10) | (RT_BE2H_U16(wcTmp) & 0x3ff));
}
iDiff = RTUniCpToUpper(uc1) - RTUniCpToUpper(uc2);
if (iDiff)
iDiff = RTUniCpToLower(uc1) - RTUniCpToLower(uc2); /* serious paranoia! */
}
if (iDiff)
return iDiff;
}
if (!wc1)
return 0;
pwsz1++;
pwsz2++;
}
}
RT_EXPORT_SYMBOL(RTUtf16BigICmp);
RTDECL(int) RTUtf16ICmpUtf8(PCRTUTF16 pwsz1, const char *psz2)
{
/*
* NULL and empty strings are all the same.
*/
if (!pwsz1)
return !psz2 || !*psz2 ? 0 : -1;
if (!psz2)
return !*pwsz1 ? 0 : 1;
/*
* Compare with a UTF-8 string by enumerating them char by char.
*/
for (;;)
{
RTUNICP uc1;
int rc = RTUtf16GetCpEx(&pwsz1, &uc1);
AssertRCReturn(rc, 1);
RTUNICP uc2;
rc = RTStrGetCpEx(&psz2, &uc2);
AssertRCReturn(rc, -1);
if (uc1 == uc2)
{
if (uc1)
continue;
return 0;
}
if (RTUniCpToUpper(uc1) == RTUniCpToUpper(uc2))
continue;
if (RTUniCpToLower(uc1) == RTUniCpToLower(uc2))
continue;
return uc1 < uc2 ? -1 : 1;
}
}
RT_EXPORT_SYMBOL(RTUtf16CmpIUtf8);
RTDECL(int) RTUtf16NICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2, size_t cwcMax)
{
if (pwsz1 == pwsz2)
return 0;
if (!pwsz1)
return -1;
if (!pwsz2)
return 1;
PCRTUTF16 pwsz1Start = pwsz1; /* keep it around in case we have to backtrack on a surrogate pair */
while (cwcMax-- > 0)
{
RTUTF16 wc1 = *pwsz1;
RTUTF16 wc2 = *pwsz2;
int iDiff = wc1 - wc2;
if (iDiff)
{
/* unless they are *both* surrogate pairs, there is no chance they'll be identical. */
if ( wc1 < 0xd800
|| wc2 < 0xd800
|| wc1 > 0xdfff
|| wc2 > 0xdfff)
{
/* simple UCS-2 char */
iDiff = RTUniCpToUpper(wc1) - RTUniCpToUpper(wc2);
if (iDiff)
iDiff = RTUniCpToLower(wc1) - RTUniCpToLower(wc2);
}
else
{
/* a damned pair */
RTUNICP uc1;
RTUNICP uc2;
if (wc1 >= 0xdc00)
{
if (pwsz1Start == pwsz1)
return iDiff;
uc1 = pwsz1[-1];
if (uc1 < 0xd800 || uc1 >= 0xdc00)
return iDiff;
uc1 = 0x10000 + (((uc1 & 0x3ff) << 10) | (wc1 & 0x3ff));
uc2 = 0x10000 + (((pwsz2[-1] & 0x3ff) << 10) | (wc2 & 0x3ff));
}
else if (cwcMax-- > 0)
{
uc1 = *++pwsz1;
if (uc1 < 0xdc00 || uc1 >= 0xe000)
return iDiff;
uc1 = 0x10000 + (((wc1 & 0x3ff) << 10) | (uc1 & 0x3ff));
uc2 = 0x10000 + (((wc2 & 0x3ff) << 10) | (*++pwsz2 & 0x3ff));
}
else
{
iDiff = wc1 - wc2;
return iDiff;
}
iDiff = RTUniCpToUpper(uc1) - RTUniCpToUpper(uc2);
if (iDiff)
iDiff = RTUniCpToLower(uc1) - RTUniCpToLower(uc2); /* serious paranoia! */
}
if (iDiff)
return iDiff;
}
if (!wc1)
return 0;
pwsz1++;
pwsz2++;
}
return 0;
}
RT_EXPORT_SYMBOL(RTUtf16NICmp);
RTDECL(int) RTUtf16BigNICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2, size_t cwcMax)
{
if (pwsz1 == pwsz2)
return 0;
if (!pwsz1)
return -1;
if (!pwsz2)
return 1;
PCRTUTF16 pwsz1Start = pwsz1; /* keep it around in case we have to backtrack on a surrogate pair */
while (cwcMax-- > 0)
{
RTUTF16 wc1 = *pwsz1;
RTUTF16 wc2 = *pwsz2;
int iDiff = wc1 - wc2;
if (iDiff)
{
/* unless they are *both* surrogate pairs, there is no chance they'll be identical. */
wc1 = RT_BE2H_U16(wc1);
wc2 = RT_BE2H_U16(wc2);
if ( wc1 < 0xd800
|| wc2 < 0xd800
|| wc1 > 0xdfff
|| wc2 > 0xdfff)
{
/* simple UCS-2 char */
iDiff = RTUniCpToUpper(wc1) - RTUniCpToUpper(wc2);
if (iDiff)
iDiff = RTUniCpToLower(wc1) - RTUniCpToLower(wc2);
}
else
{
/* a damned pair */
RTUNICP uc1;
RTUNICP uc2;
if (wc1 >= 0xdc00)
{
if (pwsz1Start == pwsz1)
return iDiff;
uc1 = RT_BE2H_U16(pwsz1[-1]);
if (uc1 < 0xd800 || uc1 >= 0xdc00)
return iDiff;
uc1 = 0x10000 + (((uc1 & 0x3ff) << 10) | (wc1 & 0x3ff));
uc2 = 0x10000 + (((RT_BE2H_U16(pwsz2[-1]) & 0x3ff) << 10) | (wc2 & 0x3ff));
}
else if (cwcMax > 0)
{
RTUTF16 wcTmp = *++pwsz1;
uc1 = RT_BE2H_U16(wcTmp);
if (uc1 < 0xdc00 || uc1 >= 0xe000)
return iDiff;
uc1 = 0x10000 + (((wc1 & 0x3ff) << 10) | (uc1 & 0x3ff));
wcTmp = *++pwsz2;
uc2 = 0x10000 + (((wc2 & 0x3ff) << 10) | (RT_BE2H_U16(wcTmp) & 0x3ff));
}
else
{
iDiff = wc1 - wc2;
return iDiff;
}
iDiff = RTUniCpToUpper(uc1) - RTUniCpToUpper(uc2);
if (iDiff)
iDiff = RTUniCpToLower(uc1) - RTUniCpToLower(uc2); /* serious paranoia! */
}
if (iDiff)
return iDiff;
}
if (!wc1)
return 0;
pwsz1++;
pwsz2++;
}
return 0;
}
RT_EXPORT_SYMBOL(RTUtf16BigNICmp);
RTDECL(PRTUTF16) RTUtf16ToLower(PRTUTF16 pwsz)
{
PRTUTF16 pwc = pwsz;
for (;;)
{
RTUTF16 wc = *pwc;
if (!wc)
break;
if (wc < 0xd800 || wc >= 0xdc00)
{
RTUNICP ucFolded = RTUniCpToLower(wc);
if (ucFolded < 0x10000)
*pwc++ = RTUniCpToLower(wc);
}
else
{
/* surrogate */
RTUTF16 wc2 = pwc[1];
if (wc2 >= 0xdc00 && wc2 <= 0xdfff)
{
RTUNICP uc = 0x10000 + (((wc & 0x3ff) << 10) | (wc2 & 0x3ff));
RTUNICP ucFolded = RTUniCpToLower(uc);
if (uc != ucFolded && ucFolded >= 0x10000) /* we don't support shrinking the string */
{
uc -= 0x10000;
*pwc++ = 0xd800 | (uc >> 10);
*pwc++ = 0xdc00 | (uc & 0x3ff);
}
}
else /* invalid encoding. */
pwc++;
}
}
return pwsz;
}
RT_EXPORT_SYMBOL(RTUtf16ToLower);
RTDECL(PRTUTF16) RTUtf16ToUpper(PRTUTF16 pwsz)
{
PRTUTF16 pwc = pwsz;
for (;;)
{
RTUTF16 wc = *pwc;
if (!wc)
break;
if (wc < 0xd800 || wc >= 0xdc00)
*pwc++ = RTUniCpToUpper(wc);
else
{
/* surrogate */
RTUTF16 wc2 = pwc[1];
if (wc2 >= 0xdc00 && wc2 <= 0xdfff)
{
RTUNICP uc = 0x10000 + (((wc & 0x3ff) << 10) | (wc2 & 0x3ff));
RTUNICP ucFolded = RTUniCpToUpper(uc);
if (uc != ucFolded && ucFolded >= 0x10000) /* we don't support shrinking the string */
{
uc -= 0x10000;
*pwc++ = 0xd800 | (uc >> 10);
*pwc++ = 0xdc00 | (uc & 0x3ff);
}
}
else /* invalid encoding. */
pwc++;
}
}
return pwsz;
}
RT_EXPORT_SYMBOL(RTUtf16ToUpper);
|
