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283 lines
6.4 KiB
283 lines
6.4 KiB
/* |
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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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#include "utf8_private.h" |
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namespace pt |
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{ |
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namespace private_namespace |
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{ |
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/*! |
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an auxiliary function for converting from UTF-8 string |
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*/ |
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bool UTF8ToInt_FirstOctet(unsigned char uz, size_t & len, int & res) |
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{ |
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for(len=0 ; (uz & 0x80) != 0 ; ++len) |
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uz <<= 1; |
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if( len == 1 || len > 4 ) |
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return false; |
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res = uz; |
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if( len > 0 ) |
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res >>= len; |
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if( len == 0 ) |
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len = 1; |
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return true; |
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} |
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/*! |
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an auxiliary function for converting from UTF-8 string |
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*/ |
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bool UTF8ToInt_AddNextOctet(unsigned char uz, int & res) |
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{ |
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if( (uz & 0xc0) != 0x80 ) |
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return false; |
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res <<= 6; |
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res |= (uz & 0x3F); |
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return true; |
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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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converting a wide character into one int |
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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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size_t WideToInt(const wchar_t * wide_string, size_t string_len, int & z, bool & correct) |
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{ |
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if( string_len == 0 ) |
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{ |
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z = 0; |
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correct = false; |
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return 0; |
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} |
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z = static_cast<int>(*wide_string); |
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correct = true; |
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if( sizeof(wchar_t) == 2 && (z>=0xD800 && z<=0xDFFF) ) |
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{ |
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if( z>=0xD800 && z<=0xDBFF && string_len>1 ) |
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{ |
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int z2 = *(wide_string+1); |
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if( z2>=0xDC00 && z2<=0xDFFF ) |
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{ |
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z = 0x10000 + (((z & 0x3FF) << 10) | (z2 & 0x3FF)); |
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return 2; |
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} |
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else |
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{ |
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correct = false; |
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return 2; |
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} |
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} |
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else |
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{ |
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correct = false; |
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return 1; |
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} |
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} |
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else |
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{ |
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correct = UTF8_CheckRange(z); |
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return 1; |
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} |
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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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converting a wide character into one int |
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returns how many wide characters were used |
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if wide_string has at least one character then the return value is always greater than zero too |
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*/ |
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size_t WideToInt(const wchar_t * wide_string, int & z, bool & correct) |
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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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{ |
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z = 0; |
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correct = false; |
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return 0; |
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} |
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if( *(wide_string+1) != 0 ) |
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min_str_len = 2; |
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return WideToInt(wide_string, min_str_len, z, correct); |
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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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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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utf8_written - how many characters were saved in the utf8 string (the string doesn't have |
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a null terminating character) |
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it can be equal to zero if the utf8 buffer is too small or there was an incorrect wide character read |
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was_utf8_buf_too_small - will be true if the utf8 buffer is too small |
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if this flag is true then utf8_written is equal to zero |
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was_error - will be true if there is an error when converting (there was an incorrect wide character) |
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(was_error will not be true if the utf8 buffer is too small) |
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*/ |
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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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{ |
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int z; |
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bool correct; |
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size_t chars; |
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utf8_written = 0; |
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was_utf8_buf_too_small = false; |
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chars = WideToInt(wide_string, string_len, z, correct); |
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if( correct ) |
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{ |
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utf8_written = IntToUTF8(z, utf8, utf8_len); |
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if( utf8_written == 0 ) |
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was_utf8_buf_too_small = true; |
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} |
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else |
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{ |
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if( mode == 1 ) |
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{ |
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utf8_written = IntToUTF8(0xFFFD, utf8, utf8_len); // U+FFFD "replacement character" |
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if( utf8_written == 0 ) |
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was_utf8_buf_too_small = true; |
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} |
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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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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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size_t WideOneToUTF8(const wchar_t * wide_string, size_t string_len, std::string & 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, false) != 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, false); // 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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returns how many wide characters were used |
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if wide_string has at least one character then the return value is always greater than zero too |
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*/ |
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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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int z; |
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bool correct; |
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size_t chars; |
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chars = WideToInt(wide_string, z, correct); |
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if( correct ) |
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correct = IntToUTF8(z, utf8, false) != 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, false); // 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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} // namespace private_namespace |
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} // namespace pt |
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