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/* Utf8.cpp
Copyright (c) 2017, 2018 by Flavio J. Saraiva
Endless Sky 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 3 of the License, or (at your option) any later version.
Endless Sky 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, see <https://www.gnu.org/licenses/>.
*/
#include "Utf8.h"
#if defined(_WIN32)
#define STRICT
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
using namespace std;
namespace {
constexpr char32_t BOM = 0x0000FEFF;
}
namespace Utf8 {
#if defined(_WIN32)
wstring ToUTF16(const string &input, bool isPath)
{
const auto page = CP_UTF8;
wstring result;
if(input.empty())
return result;
bool endsInSlash = isPath && (input.back() == '/' || input.back() == '\\');
int size = MultiByteToWideChar(page, 0, &input[0], input.length() - endsInSlash, nullptr, 0);
result.resize(size);
MultiByteToWideChar(page, 0, &input[0], input.length() - endsInSlash, &result[0], size);
return result;
}
string ToUTF8(const wchar_t *str)
{
string result;
if(!str || !*str)
return result;
const auto page = CP_UTF8;
// The returned size will include the null character at the end.
int size = WideCharToMultiByte(page, 0, str, -1, nullptr, 0, nullptr, nullptr) - 1;
result.resize(size);
WideCharToMultiByte(page, 0, str, -1, &result[0], size, nullptr, nullptr);
return result;
}
#endif
// Check if this character is the byte order mark (BOM) sequence.
bool IsBOM(char32_t c)
{
return c == BOM;
}
size_t NextCodePoint(const string &str, size_t pos)
{
if(pos >= str.length())
return string::npos;
for(++pos; pos < str.length(); ++pos)
if((str[pos] & 0x80) == 0 || (str[pos] & 0xc0) == 0xc0)
break;
return pos;
}
// Returns the start of the unicode code point at pos in utf8.
size_t CodePointStart(const string &str, size_t pos)
{
// 0xxxxxxx and 11?????? start a code point
while(pos > 0 && (str[pos] & 0x80) != 0x00 && (str[pos] & 0xc0) != 0xc0)
--pos;
return pos;
}
// Determines the number of bytes used by the unicode code point in utf8.
int CodePointBytes(const char *str)
{
// end - 00000000
if(!str || !*str)
return 0;
// 1 byte - 0xxxxxxx
if((*str & 0x80) == 0)
return 1;
// invalid - 10?????? or 11?????? invalid
if((*str & 0x40) == 0 || (*(str + 1) & 0xc0) != 0x80)
return -1;
// 2 bytes - 110xxxxx 10xxxxxx
if((*str & 0x20) == 0)
return 2;
// invalid - 111????? 10?????? invalid
if((*(str + 2) & 0xc0) != 0x80)
return -1;
// 3 bytes - 1110xxxx 10xxxxxx 10xxxxxx
if((*str & 0x10) == 0)
return 3;
// invalid - 1111???? 10?????? 10?????? invalid
if((*(str + 3) & 0xc0) != 0x80)
return -1;
// 4 bytes - 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
if((*str & 0x8) == 0)
return 4;
// not unicode - 11111??? 10?????? 10?????? 10??????
return -1;
}
// Decodes a unicode code point in utf8.
// Invalid codepoints are converted to 0xFFFFFFFF.
char32_t DecodeCodePoint(const string &str, size_t &pos)
{
if(pos >= str.length())
{
pos = string::npos;
return 0;
}
// invalid (-1) or end (0)
int bytes = CodePointBytes(str.c_str() + pos);
if(bytes < 1)
{
++pos;
return bytes;
}
// 1 byte
if(bytes == 1)
return (str[pos++] & 0x7f);
// 2-4 bytes
char32_t c = (str[pos++] & ((1 << (7 - bytes)) - 1));
for(int i = 1; i < bytes; ++i)
c = (c << 6) + (str[pos++] & 0x3f);
return c;
}
}
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