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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.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; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "CaseFold.hxx"
#include "config.h"
#ifdef HAVE_ICU_CASE_FOLD
#include "util/AllocatedString.hxx"
#ifdef HAVE_ICU
#include "Util.hxx"
#include "util/AllocatedArray.hxx"
#include <unicode/ucol.h>
#include <unicode/ustring.h>
#else
#include <algorithm>
#endif
#include <memory>
#include <string.h>
AllocatedString
IcuCaseFold(std::string_view src) noexcept
try {
#ifdef HAVE_ICU
const auto u = UCharFromUTF8(src);
if (u.IsNull())
return AllocatedString::Duplicate(src);
AllocatedArray<UChar> folded(u.size() * 2U);
UErrorCode error_code = U_ZERO_ERROR;
size_t folded_length = u_strFoldCase(folded.begin(), folded.size(),
u.begin(), u.size(),
U_FOLD_CASE_DEFAULT,
&error_code);
if (folded_length == 0 || error_code != U_ZERO_ERROR)
return AllocatedString::Duplicate(src);
folded.SetSize(folded_length);
return UCharToUTF8({folded.begin(), folded.size()});
#else
#error not implemented
#endif
} catch (...) {
return AllocatedString::Duplicate(src);
}
#endif /* HAVE_ICU_CASE_FOLD */
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