102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2021-2022, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef headerfile_pikotools_src_utf8_utf8_stream
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#define headerfile_pikotools_src_utf8_utf8_stream
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#include "textstream/textstream.h"
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namespace pt
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{
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/*!
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this function converts one UTF-8 character into one wide-character
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input:
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iterator_in - an TextStream iterator for reading from
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iterator_end - an end iterator (can be returned by end() method from TextStream)
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output:
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res - an output character
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correct - true if it is a correct character
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the function returns how many characters have been used from the input stream
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*/
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template<typename StreamIteratorType>
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size_t utf8_to_int(
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StreamIteratorType & iterator_in,
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const StreamIteratorType & iterator_end,
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int & res,
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bool & correct)
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{
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size_t i, len;
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unsigned char uz;
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res = 0;
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correct = false;
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if( iterator_in == iterator_end )
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return 0;
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uz = *iterator_in;
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++iterator_in;
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if( !private_namespace::utf8_to_int_first_octet(uz, len, res) )
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return 1;
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for(i=1 ; i<len ; ++i)
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{
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if( iterator_in == iterator_end )
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return i;
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uz = *iterator_in;
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++iterator_in;
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if( !private_namespace::utf8_to_int_add_next_octet(uz, res) )
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return i;
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}
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if( utf8_check_range(res, len) )
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correct = true;
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return len;
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}
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}
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#endif
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