mirror of
https://github.com/TerryCavanagh/VVVVVV.git
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91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
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// Copyright 2006 Nemanja Trifunovic
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/*
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#define UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#include "core.h"
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namespace utf8
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{
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namespace unchecked
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{
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template <typename octet_iterator>
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uint32_t next(octet_iterator& it)
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{
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uint32_t cp = utf8::internal::mask8(*it);
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typename std::iterator_traits<octet_iterator>::difference_type length = utf8::internal::sequence_length(it);
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switch (length) {
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case 1:
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break;
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case 2:
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it++;
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cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
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break;
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case 3:
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++it;
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cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
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++it;
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cp += (*it) & 0x3f;
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break;
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case 4:
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++it;
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cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
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++it;
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cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
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++it;
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cp += (*it) & 0x3f;
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break;
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}
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++it;
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return cp;
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}
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template <typename octet_iterator>
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uint32_t prior(octet_iterator& it)
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{
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while (utf8::internal::is_trail(*(--it))) ;
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octet_iterator temp = it;
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return utf8::unchecked::next(temp);
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}
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template <typename octet_iterator>
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typename std::iterator_traits<octet_iterator>::difference_type
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distance (octet_iterator first, octet_iterator last)
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{
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typename std::iterator_traits<octet_iterator>::difference_type dist;
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for (dist = 0; first < last; ++dist)
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utf8::unchecked::next(first);
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return dist;
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}
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} // namespace utf8::unchecked
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} // namespace utf8
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#endif // header guard
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