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/**
* \file utf8conv.c.
*
* UTF-8 conversion functions
*/
/* XTrkCad - Model Railroad CAD
* Copyright (C) 2020 Martin Fischer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdbool.h>
#include <string.h>
#include <Windows.h>
#include <wlib.h>
/**
* Convert system codepage to UTF 8
*
* \param inString The input string.
* \param [in,out] outString The output string buffer.
* \param outStringLength Length of the output buffer
*
* \returns FALSE if it fails.
*/
bool
wSystemToUTF8(const char *inString, char *outString, unsigned outStringLength)
{
unsigned int cnt = 2 * (unsigned int)(strlen(inString) + 1);
char *tempBuffer = malloc(cnt);
// convert to wide character (UTF16)
MultiByteToWideChar(CP_ACP,
0,
inString,
-1,
(LPWSTR)tempBuffer,
cnt);
// convert from wide char to UTF-8
WideCharToMultiByte(CP_UTF8,
0,
(LPCWCH)tempBuffer,
-1,
(LPSTR)outString,
outStringLength,
NULL,
NULL);
free(tempBuffer);
return true;
}
/**
* Convert from UTF-8 to system codepage
*
* \param inString The input string.
* \param [in,out] outString the output string.
* \param outStringLength Length of the output buffer.
*
* \returns True if it succeeds, false if it fails.
*/
bool
wUTF8ToSystem(const char *inString, char *outString, unsigned outStringLength)
{
unsigned int cnt = 2 * (int)(strlen(inString) + 1);
char *tempBuffer = malloc(cnt);
// convert to wide character (UTF16)
MultiByteToWideChar(CP_UTF8,
0,
inString,
-1,
(LPWSTR)tempBuffer,
cnt);
cnt = WideCharToMultiByte(CP_ACP,
0,
(LPCWCH)tempBuffer,
-1,
(LPSTR)outString,
0L,
NULL,
NULL);
if (outStringLength <= cnt) {
return (false);
}
// convert from wide char to system codepage
WideCharToMultiByte(CP_ACP,
0,
(LPCWCH)tempBuffer,
-1,
(LPSTR)outString,
outStringLength,
NULL,
NULL);
free(tempBuffer);
return true;
}
/**
* Is passed string in correct UTF-8 format?
* Taken from https://stackoverflow.com/questions/1031645/how-to-detect-utf-8-in-plain-c
*
* \param string The string to check.
*
* \returns True if UTF 8, false if not.
*/
bool wIsUTF8(const char * string)
{
if (!string) {
return 0;
}
const unsigned char * bytes = (const unsigned char *)string;
while (*bytes) {
if ((// ASCII
// use bytes[0] <= 0x7F to allow ASCII control characters
bytes[0] == 0x09 ||
bytes[0] == 0x0A ||
bytes[0] == 0x0D ||
(0x20 <= bytes[0] && bytes[0] <= 0x7E)
)
) {
bytes += 1;
continue;
}
if ((// non-overlong 2-byte
(0xC2 <= bytes[0] && bytes[0] <= 0xDF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF)
)
) {
bytes += 2;
continue;
}
if ((// excluding overlongs
bytes[0] == 0xE0 &&
(0xA0 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// straight 3-byte
((0xE1 <= bytes[0] && bytes[0] <= 0xEC) ||
bytes[0] == 0xEE ||
bytes[0] == 0xEF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// excluding surrogates
bytes[0] == 0xED &&
(0x80 <= bytes[1] && bytes[1] <= 0x9F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
)
) {
bytes += 3;
continue;
}
if ((// planes 1-3
bytes[0] == 0xF0 &&
(0x90 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// planes 4-15
(0xF1 <= bytes[0] && bytes[0] <= 0xF3) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// plane 16
bytes[0] == 0xF4 &&
(0x80 <= bytes[1] && bytes[1] <= 0x8F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
)
) {
bytes += 4;
continue;
}
return false;
}
return true;
}
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