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/*
* Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights
* reserved.
* Copyright (C) 2008 Holger Hans Peter Freyther
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/fonts/utf16_text_iterator.h"
namespace blink {
bool UTF16TextIterator::IsValidSurrogatePair(UChar32& character) {
// If we have a surrogate pair, make sure it starts with the high part.
if (!U16_IS_SURROGATE_LEAD(character))
return false;
// Do we have a surrogate pair? If so, determine the full Unicode (32 bit)
// code point before glyph lookup.
// Make sure we have another character and it's a low surrogate.
if (characters_ + 1 >= characters_end_)
return false;
UChar low = characters_[1];
if (!U16_IS_TRAIL(low))
return false;
return true;
}
bool UTF16TextIterator::ConsumeSurrogatePair(UChar32& character) {
DCHECK(U16_IS_SURROGATE(character));
if (!IsValidSurrogatePair(character)) {
character = WTF::unicode::kReplacementCharacter;
return true;
}
UChar low = characters_[1];
character = U16_GET_SUPPLEMENTARY(character, low);
current_glyph_length_ = 2;
return true;
}
} // namespace blink
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