221 lines
5.8 KiB
C++
221 lines
5.8 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the (new) 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, 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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* * 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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* * 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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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 OWNER 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
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef headerfile_picotools_utf8_utf8_private
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#define headerfile_picotools_utf8_utf8_private
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#include "textstream/textstream.h"
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namespace PT
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{
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bool UTF8_CheckRange(int c);
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size_t IntToUTF8(int z, char * utf8, size_t utf8_max_len);
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size_t IntToUTF8(int z, std::string & utf8, bool clear);
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size_t UTF8ToInt(const char * utf8, size_t utf8_len, int & res, bool & correct);
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namespace private_namespace
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{
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bool UTF8ToInt_FirstOctet(unsigned char uz, size_t & len, int & res);
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bool UTF8ToInt_AddNextOctet(unsigned char uz, int & res);
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size_t WideToInt(const wchar_t * wide_string, size_t string_len, int & z, bool & correct);
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size_t WideToInt(const wchar_t * wide_string, int & z, bool & correct);
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size_t WideOneToUTF8(const wchar_t * wide_string, size_t string_len, char * utf8, size_t utf8_len,
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size_t & utf8_written, bool & was_utf8_buf_too_small, bool & was_error, int mode);
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size_t WideOneToUTF8(const wchar_t * wide_string, size_t string_len, std::string & utf8, bool & was_error, int mode);
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size_t WideOneToUTF8(const wchar_t * wide_string, std::string & utf8, bool & was_error, int mode);
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/*!
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an auxiliary function for converting from wide characters to UTF-8
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returns how many wide characters were used
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if string_len is greater than 0 then the return value is always greater than zero too
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*/
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template<typename StreamType>
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static size_t WideOneToUTF8(const wchar_t * wide_string, size_t string_len, StreamType & utf8, bool & was_error, int mode)
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{
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int z;
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bool correct;
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size_t chars;
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chars = WideToInt(wide_string, string_len, z, correct);
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if( correct )
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correct = IntToUTF8(z, utf8) != 0;
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if( !correct )
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{
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if( mode == 1 )
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IntToUTF8(0xFFFD, utf8); // U+FFFD "replacement character"
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was_error = true;
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}
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return chars;
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}
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/*!
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an auxiliary function for converting from wide characters to UTF-8
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*/
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template<typename StreamType>
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static size_t WideOneToUTF8(const wchar_t * wide_string, StreamType & utf8, bool & was_error, int mode)
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{
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size_t min_str_len = 1;
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if( *wide_string == 0 )
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return 0;
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if( *(wide_string+1) != 0 )
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min_str_len = 2;
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return WideOneToUTF8(wide_string, min_str_len, utf8, was_error, mode);
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}
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// declared in utf8.h, defined in utf8.cpp
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size_t UTF8ToInt(const char * utf8, size_t utf8_len, int & res, bool & correct);
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template<typename function_type>
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bool UTF8ToWideGeneric(const char * utf8, size_t utf8_len, int mode, function_type convert_function)
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{
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int z;
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size_t len;
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bool correct, was_error = false;
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while( utf8_len > 0 )
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{
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if( (unsigned char)*utf8 <= 0x7f )
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{
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// small optimization
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len = 1;
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correct = true;
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z = static_cast<unsigned char>(*utf8);
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}
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else
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{
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len = PT::UTF8ToInt(utf8, utf8_len, z, correct); // the len will be different from zero
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}
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if( !correct )
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{
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if( mode == 1 )
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convert_function(0xFFFD); // U+FFFD "replacement character"
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was_error = true;
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}
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else
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{
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convert_function(z);
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}
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utf8 += len;
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utf8_len -= len;
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}
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return !was_error;
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}
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template<typename StreamType>
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void IntToWide(int c, StreamType & res)
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{
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if( sizeof(wchar_t)==2 && c>0xffff )
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{
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// UTF16 surrogate pairs
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c -= 0x10000;
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res << static_cast<wchar_t>(((c >> 10) & 0x3FF) + 0xD800);
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res << static_cast<wchar_t>((c & 0x3FF) + 0xDC00);
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}
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else
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{
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res << static_cast<wchar_t>(c);
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}
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}
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// not tested
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// FIX ME it is not using surrogate pairs from input stream
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// and mode parameter
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template<typename char_type, size_t stack_size, size_t heap_block_size, typename function_type>
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void WideToUTF8Generic(TextStreamBase<char_type, stack_size, heap_block_size> & buffer, int mode, function_type write_function)
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{
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char utf8_buffer[256];
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std::size_t buffer_len = sizeof(utf8_buffer) / sizeof(char);
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std::size_t utf8_sequence_max_length = 10;
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std::size_t index = 0;
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typename TextStreamBase<char_type, stack_size, heap_block_size>::const_iterator i = buffer.begin();
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while( i != buffer.end() )
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{
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if( index + utf8_sequence_max_length > buffer_len )
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{
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write_function(utf8_buffer, index);
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index = 0;
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}
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index += IntToUTF8(*i, utf8_buffer + index, buffer_len - index);
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++i;
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}
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if( index > 0 )
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{
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write_function(utf8_buffer, index);
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}
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}
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} // namespace private_namespace
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} // namespace PT
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#endif
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