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public: add functions to convert from Unicode codepoints into CP1251 or CP1252

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This commit is contained in:
Alibek Omarov 2024-05-15 05:04:13 +03:00
parent 2e0fc3e4c1
commit a084dea07c
2 changed files with 43 additions and 0 deletions
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39
public/utflib.c
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@ -205,3 +205,42 @@ size_t Q_UTF16ToUTF8( char *dst, size_t dstsize, const uint16_t *src, size_t src
return dsti;
}
static uint16_t table_cp1251[64] = {
0x0402, 0x0403, 0x201A, 0x0453, 0x201E, 0x2026, 0x2020, 0x2021,
0x20AC, 0x2030, 0x0409, 0x2039, 0x040A, 0x040C, 0x040B, 0x040F,
0x0452, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
0x007F, 0x2122, 0x0459, 0x203A, 0x045A, 0x045C, 0x045B, 0x045F,
0x00A0, 0x040E, 0x045E, 0x0408, 0x00A4, 0x0490, 0x00A6, 0x00A7,
0x0401, 0x00A9, 0x0404, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x0407,
0x00B0, 0x00B1, 0x0406, 0x0456, 0x0491, 0x00B5, 0x00B6, 0x00B7,
0x0451, 0x2116, 0x0454, 0x00BB, 0x0458, 0x0405, 0x0455, 0x0457
};
uint32_t Q_UnicodeToCP1251( uint32_t uc )
{
size_t i;
if( uc < 0x80 )
return uc;
if( uc >= 0x0410 && uc <= 0x042F )
return uc - 0x410 + 0xC0;
if( uc >= 0x0430 && uc <= 0x044F )
return uc - 0x430 + 0xE0;
for( i = 0; i < sizeof( table_cp1251 ) / sizeof( table_cp1251[0] ); i++ )
{
if( uc == (uint32_t)table_cp1251[i] )
return i + 0x80;
}
return '?';
}
uint32_t Q_UnicodeToCP1252( uint32_t uc )
{
// this is NOT valid way to convert Unicode codepoint back to CP1252!!!
return uc < 0xFF ? uc : '?';
}

4
public/utflib.h
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@ -37,4 +37,8 @@ size_t Q_UTF8Length( const char *s );
// srcsize in byte pairs
size_t Q_UTF16ToUTF8( char *dst, size_t dstsize, const uint16_t *src, size_t srcsize );
// function to convert Unicode codepoints into CP1251 or CP1252
uint32_t Q_UnicodeToCP1251( uint32_t uc );
uint32_t Q_UnicodeToCP1252( uint32_t uc );
#endif // UTFLIB_H