814 lines
19 KiB
C++
814 lines
19 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) 2010-2021, 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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#include "utf8.h"
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#include "utf8_private.h"
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namespace pt
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{
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/*!
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returns true if 'c' is a correct unicode character
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*/
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bool utf8_check_range(int c)
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{
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return c>=0 && c<=0x10FFFF && !(c>=0xD800 && c<=0xDFFF);
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}
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/*!
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returns true if 'c' is a correct unicode character
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this method is used when reading from an utf8 string
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how_many_bytes - means how many bytes from the utf8 string were read
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*/
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bool utf8_check_range(int c, int how_many_bytes)
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{
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if( c >= 0x0000 && c <= 0x007f && how_many_bytes == 1 )
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{
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return true;
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}
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if( c >= 0x0080 && c <= 0x07ff && how_many_bytes == 2 )
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{
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return true;
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}
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if( c >= 0x0800 && c < 0xD800 && how_many_bytes == 3)
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{
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return true;
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}
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if( c > 0xDFFF && c <= 0xffff && how_many_bytes == 3)
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{
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return true;
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}
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if( c >= 0x10000 && c <= 0x10FFFF && how_many_bytes == 4 )
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{
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return true;
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}
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return false;
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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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utf8 - an input UTF-8 string
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utf8_len - size of the input string,
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the string should be at least 4 bytes length for correctly
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recognized the utf-8 sequence
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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 string
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(returns zero only if utf8_len is zero)
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even if there are errors the functions returns a different from zero value
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*/
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size_t utf8_to_int(const char * utf8, size_t utf8_len, int & res, bool & correct)
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{
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size_t i, len;
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res = 0;
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correct = false;
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if( utf8_len == 0 )
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return 0;
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if( !private_namespace::utf8_to_int_first_octet(utf8[0], len, res) )
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return 1;
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if( utf8_len < len )
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return utf8_len;
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for(i=1 ; i<len ; ++i)
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{
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if( !private_namespace::utf8_to_int_add_next_octet(utf8[i], 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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this function converts one UTF-8 character into one wide-character
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input:
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utf8 - an input UTF-8 string (null terminated)
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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 string
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(returns zero only if the string has '\0' at the first character)
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even if there are errors the functions returns a different from zero value
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*/
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size_t utf8_to_int(const char * utf8, int & res, bool & correct)
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{
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size_t i, len;
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res = 0;
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correct = false;
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if( *utf8 == 0 )
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return 0;
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if( !private_namespace::utf8_to_int_first_octet(utf8[0], 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( utf8[i] == 0 )
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return i;
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if( !private_namespace::utf8_to_int_add_next_octet(utf8[i], 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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this function converts one UTF-8 character into one wide-character
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input:
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utf8 - an input UTF-8 string
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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 string
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(returns zero only if utf8 is empty)
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even if there are errors the functions returns a different from zero value
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*/
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size_t utf8_to_int(const std::string & utf8, int & res, bool & correct)
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{
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return utf8_to_int(utf8.c_str(), utf8.size(), res, correct);
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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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utf8 - an input UTF-8 stream
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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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size_t utf8_to_int(std::istream & utf8, int & res, 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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uz = utf8.get();
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if( !utf8 )
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return 0;
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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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uz = utf8.get();
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if( !utf8 )
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return i;
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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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*/
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static void int_to_wide(int c, std::wstring & 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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/*!
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this function converts an utf8 string into wide string (std::wstring)
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input:
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utf8 - an input utf8 string
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utf8_len - size of the input string
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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res - an output wide string
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the function returns false if there were some errors when converting
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*/
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bool utf8_to_wide(const char * utf8, size_t utf8_len, std::wstring & res, bool clear, int mode)
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{
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if( clear )
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res.clear();
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bool status = private_namespace::utf8_to_wide_generic(utf8, utf8_len, mode, [&res](int c) {
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int_to_wide(c, res);
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});
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return status;
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}
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/*!
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this function converts an utf8 string into wide string (std::wstring)
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input:
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utf8 - an input utf8 null terminated string
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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res - an output wide string
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the function returns false if there were some errors when converting
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*/
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bool utf8_to_wide(const char * utf8, std::wstring & res, bool clear, int mode)
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{
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size_t utf8_len = 0;
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while( utf8[utf8_len] != 0 )
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utf8_len += 1;
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return utf8_to_wide(utf8, utf8_len, res, clear, mode);
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}
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/*!
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this function converts an utf8 string into wide string (std::wstring)
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input:
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utf8 - an input utf8 string
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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res - an output wide string
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the function returns false if there were some errors when converting
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*/
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bool utf8_to_wide(const std::string & utf8, std::wstring & res, bool clear, int mode)
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{
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return utf8_to_wide(utf8.c_str(), utf8.size(), res, clear, mode);
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}
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/*!
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this function converts an utf8 stream into wide string (std::wstring)
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input:
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utf8 - an input utf8 stream
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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res - an output wide string
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the function returns false if there were some errors when converting
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*/
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bool utf8_to_wide(std::istream & utf8, std::wstring & res, bool clear, int mode)
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{
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int z;
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bool correct, was_error = false;
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if( clear )
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res.clear();
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while( utf8_to_int(utf8, z, correct) > 0 )
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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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res += 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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int_to_wide(z, res);
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}
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}
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return !was_error;
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}
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/*!
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this function converts one wide character into UTF-8 sequence
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input:
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z - wide character
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output:
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utf8 - a buffer for the output sequence
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utf8_len - the size of the buffer
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the function returns how many characters have been written to the utf8,
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zero means the utf8 buffer is too small or 'z' is an incorrect unicode character
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*/
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size_t int_to_utf8(int z, char * utf8, size_t utf8_max_len)
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{
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char buf[10];
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int i = 0;
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int mask = 0x3f; // 6 first bits set
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if( utf8_max_len==0 || !utf8_check_range(z) )
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return 0;
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if( z <= 0x7f )
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{
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utf8[0] = static_cast<char>(z);
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return 1;
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}
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do
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{
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buf[i] = 0x80 | (z & 0x3f);
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i += 1;
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z >>= 6;
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mask >>= 1;
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}
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while( (z & (~mask)) != 0 );
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unsigned int first = -1;
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first <<= (7 - i);
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first |= (z & mask);
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if( size_t(i+1) > utf8_max_len )
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return 0;
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utf8[0] = static_cast<char>(first);
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int a = 1;
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for(--i; i>=0 ; --i, ++a)
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utf8[a] = buf[i];
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return a;
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}
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/*!
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this function converts one wide character into UTF-8 string
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input:
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z - wide character
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output:
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utf8 - a UTF-8 string for the output sequence (the string is not cleared)
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the function returns how many characters have been written to the utf8 string,
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zero means that 'z' is an incorrect unicode character
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*/
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size_t int_to_utf8(int z, std::string & utf8, bool clear)
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{
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char buf[10];
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if( clear )
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utf8.clear();
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size_t len = int_to_utf8(z, buf, sizeof(buf)/sizeof(char));
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size_t i;
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for(i=0 ; i<len ; ++i)
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utf8 += buf[i];
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return len;
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}
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/*!
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this function converts a wide string into UTF-8 string
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input:
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wide_string - a wide string for converting
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string_len - the size of the string
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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utf8 - a UTF-8 string for the output sequence (the string is not cleared)
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this function returns false if there were some errors when converting
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*/
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bool wide_to_utf8(const wchar_t * wide_string, size_t string_len, std::string & utf8, bool clear, int mode)
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{
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bool was_error = false;
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size_t chars;
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if( clear )
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utf8.clear();
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while( string_len > 0 )
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{
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chars = private_namespace::wide_one_to_utf8(wide_string, string_len, utf8, was_error, mode);
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wide_string += chars;
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string_len -= chars;
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}
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return !was_error;
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}
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/*!
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this function converts a wide string into UTF-8 string
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input:
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wide_string - a null terminated wide string for converting
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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utf8 - a UTF-8 string for the output sequence (the string is not cleared)
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this function returns false if there were some errors when converting
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*/
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bool wide_to_utf8(const wchar_t * wide_string, std::string & utf8, bool clear, int mode)
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{
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bool was_error = false;
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if( clear )
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utf8.clear();
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while( *wide_string )
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wide_string += private_namespace::wide_one_to_utf8(wide_string, utf8, was_error, mode);
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return !was_error;
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}
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/*!
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this function converts a wide string (std::wstring) into UTF-8 string
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input:
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wide_string - a wide string for converting
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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utf8 - a UTF-8 string for the output sequence (the string is not cleared)
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this function returns false if there were some errors when converting
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*/
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bool wide_to_utf8(const std::wstring & wide_string, std::string & utf8, bool clear, int mode)
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{
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return wide_to_utf8(wide_string.c_str(), wide_string.size(), utf8, clear, mode);
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}
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/*!
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this function converts a wide string into UTF-8 stream
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input:
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wide_string - a wide string for converting
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string_len - lenght of the wide string
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mode - what to do with errors when converting
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0: skip an invalid character
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1: put U+FFFD "replacement character" istead of the invalid character (default)
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output:
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utf8 - a buffer for the UTF-8 stream
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utf8_len - the size of the buffer
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utf8_written - how many bytes have been written to the buffer
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this function returns false if there were some errors when converting or the output buffer was too small,
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the output string is not null terminated
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if there is an error when converting (there is an incorrect character in the wide string) the function
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will continue converting but if the buffer is too small the function breaks immediately
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*/
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bool wide_to_utf8(const wchar_t * wide_string, size_t string_len, char * utf8, size_t utf8_len, size_t & utf8_written, int mode)
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{
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bool was_error = false;
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bool was_buffer_to_small;
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size_t chars, utf8_saved;
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utf8_written = 0;
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while( string_len > 0 )
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{
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chars = private_namespace::wide_one_to_utf8(wide_string, string_len, utf8, utf8_len, utf8_saved, was_buffer_to_small, was_error, mode);
|
|
|
|
if( was_buffer_to_small )
|
|
{
|
|
/*
|
|
* if the buffer was too small break immediately
|
|
* and set the was_error flag
|
|
*/
|
|
was_error = true;
|
|
break;
|
|
}
|
|
|
|
wide_string += chars;
|
|
string_len -= chars;
|
|
utf8 += utf8_saved;
|
|
utf8_len -= utf8_saved;
|
|
utf8_written += utf8_saved;
|
|
}
|
|
|
|
return !was_error;
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
this function converts a wide string (std::wstring) into UTF-8 stream
|
|
|
|
input:
|
|
wide_string - a wide string for converting
|
|
mode - what to do with errors when converting
|
|
0: skip an invalid character
|
|
1: put U+FFFD "replacement character" istead of the invalid character (default)
|
|
|
|
output:
|
|
utf8 - a buffer for the UTF-8 stream
|
|
utf8_len - the size of the buffer
|
|
utf8_written - how many bytes have been written to the buffer
|
|
|
|
this function returns false if there were some errors when converting or the output buffer was too small,
|
|
the output string is not null terminated
|
|
|
|
if there is an error when converting (there is an incorrect character in the wide string) the function
|
|
will continue converting but if the buffer is too small the function breaks immediately
|
|
*/
|
|
bool wide_to_utf8(const std::wstring & wide_string, char * utf8, size_t utf8_len, size_t & utf8_written, int mode)
|
|
{
|
|
return wide_to_utf8(wide_string.c_str(), wide_string.size(), utf8, utf8_len, utf8_written, mode);
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
this function converts a wide string into UTF-8 stream
|
|
|
|
input:
|
|
wide_string - a wide string for converting
|
|
string_len - lenght of the wide string
|
|
mode - what to do with errors when converting
|
|
0: skip an invalid character
|
|
1: put U+FFFD "replacement character" istead of the invalid character (default)
|
|
|
|
output:
|
|
utf8 - a buffer for the UTF-8 stream
|
|
utf8_len - the size of the buffer
|
|
|
|
this function returns false if there were some errors when converting or the output buffer was too small,
|
|
the output string is null terminated (even if there were errors during converting)
|
|
|
|
if there is an error when converting (there is an incorrect character in the wide string) the function
|
|
will continue converting but if the buffer is too small the function breaks immediately
|
|
(in both cases the utf8 buffer is null terminated)
|
|
*/
|
|
bool wide_to_utf8(const wchar_t * wide_string, size_t string_len, char * utf8, size_t utf8_len, int mode)
|
|
{
|
|
size_t utf8_saved;
|
|
bool res;
|
|
|
|
if( utf8_len == 0 )
|
|
return false;
|
|
|
|
res = wide_to_utf8(wide_string, string_len, utf8, utf8_len - 1, utf8_saved, mode);
|
|
utf8[utf8_saved] = 0;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
this function converts a wide string (std::wstring) into UTF-8 stream
|
|
|
|
input:
|
|
wide_string - a wide string for converting
|
|
mode - what to do with errors when converting
|
|
0: skip an invalid character
|
|
1: put U+FFFD "replacement character" istead of the invalid character (default)
|
|
|
|
output:
|
|
utf8 - a buffer for the UTF-8 stream
|
|
utf8_len - the size of the buffer
|
|
|
|
this function returns false if there were some errors when converting or the output buffer was too small,
|
|
the output string is null terminated (even if there were errors during converting)
|
|
|
|
if there is an error when converting (there is an incorrect character in the wide string) the function
|
|
will continue converting but if the buffer is too small the function breaks immediately
|
|
(in both cases the utf8 buffer is null terminated)
|
|
*/
|
|
bool wide_to_utf8(const std::wstring & wide_string, char * utf8, size_t utf8_len, int mode)
|
|
{
|
|
return wide_to_utf8(wide_string.c_str(), wide_string.size(), utf8, utf8_len, mode);
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
this function converts a wide string into UTF-8 stream
|
|
|
|
input:
|
|
wide_string - a null terminated wide string for converting
|
|
mode - what to do with errors when converting
|
|
0: skip an invalid character
|
|
1: put U+FFFD "replacement character" istead of the invalid character (default)
|
|
|
|
output:
|
|
utf8 - a buffer for the UTF-8 stream
|
|
utf8_len - the size of the buffer
|
|
utf8_written - how many bytes have been written to the buffer
|
|
|
|
this function returns false if there were some errors when converting or the output buffer was too small,
|
|
the output string is not null terminated
|
|
|
|
if there is an error when converting (there is an incorrect character in the wide string) the function
|
|
will continue converting but if the buffer is too small the function breaks immediately
|
|
*/
|
|
bool wide_to_utf8(const wchar_t * wide_string, char * utf8, size_t utf8_len, size_t & utf8_written, int mode)
|
|
{
|
|
bool was_error = false;
|
|
bool was_buffer_to_small;
|
|
size_t chars, utf8_saved;
|
|
size_t len;
|
|
|
|
utf8_written = 0;
|
|
|
|
while( *wide_string )
|
|
{
|
|
len = (*(wide_string+1) == 0) ? 1 : 2;
|
|
chars = private_namespace::wide_one_to_utf8(wide_string, len, utf8, utf8_len, utf8_saved, was_buffer_to_small, was_error, mode);
|
|
|
|
if( was_buffer_to_small )
|
|
{
|
|
/*
|
|
* if the buffer was too small break immediately
|
|
* and set the was_error flag
|
|
*/
|
|
was_error = true;
|
|
break;
|
|
}
|
|
|
|
wide_string += chars;
|
|
utf8 += utf8_saved;
|
|
utf8_len -= utf8_saved;
|
|
utf8_written += utf8_saved;
|
|
}
|
|
|
|
return !was_error;
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
this function converts a wide string into UTF-8 stream
|
|
|
|
input:
|
|
wide_string - a wide string for converting
|
|
mode - what to do with errors when converting
|
|
0: skip an invalid character
|
|
1: put U+FFFD "replacement character" istead of the invalid character (default)
|
|
|
|
output:
|
|
utf8 - a buffer for the UTF-8 stream
|
|
utf8_len - the size of the buffer
|
|
|
|
this function returns false if there were some errors when converting or the output buffer was too small,
|
|
the output string is null terminated (even if there were errors during converting)
|
|
|
|
if there is an error when converting (there is an incorrect character in the wide string) the function
|
|
will continue converting but if the buffer is too small the function breaks immediately
|
|
(in both cases the utf8 buffer is null terminated)
|
|
*/
|
|
bool wide_to_utf8(const wchar_t * wide_string, char * utf8, size_t utf8_len, int mode)
|
|
{
|
|
size_t utf8_saved;
|
|
bool res;
|
|
|
|
if( utf8_len == 0 )
|
|
return false;
|
|
|
|
res = wide_to_utf8(wide_string, utf8, utf8_len - 1, utf8_saved, mode);
|
|
utf8[utf8_saved] = 0;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
} // namespace
|
|
|