Created
August 11, 2012 06:30
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C++: convert between utf8 and unicode
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wstring UTF8toUnicode(const string& s) | |
{ | |
wstring ws; | |
wchar_t wc; | |
for( int i = 0;i < s.length(); ) | |
{ | |
char c = s[i]; | |
if ( (c & 0x80) == 0 ) | |
{ | |
wc = c; | |
++i; | |
} | |
else if ( (c & 0xE0) == 0xC0 ) | |
{ | |
wc = (s[i] & 0x1F) << 6; | |
wc |= (s[i+1] & 0x3F); | |
i += 2; | |
} | |
else if ( (c & 0xF0) == 0xE0 ) | |
{ | |
wc = (s[i] & 0xF) << 12; | |
wc |= (s[i+1] & 0x3F) << 6; | |
wc |= (s[i+2] & 0x3F); | |
i += 3; | |
} | |
else if ( (c & 0xF8) == 0xF0 ) | |
{ | |
wc = (s[i] & 0x7) << 18; | |
wc |= (s[i+1] & 0x3F) << 12; | |
wc |= (s[i+2] & 0x3F) << 6; | |
wc |= (s[i+3] & 0x3F); | |
i += 4; | |
} | |
else if ( (c & 0xFC) == 0xF8 ) | |
{ | |
wc = (s[i] & 0x3) << 24; | |
wc |= (s[i] & 0x3F) << 18; | |
wc |= (s[i] & 0x3F) << 12; | |
wc |= (s[i] & 0x3F) << 6; | |
wc |= (s[i] & 0x3F); | |
i += 5; | |
} | |
else if ( (c & 0xFE) == 0xFC ) | |
{ | |
wc = (s[i] & 0x1) << 30; | |
wc |= (s[i] & 0x3F) << 24; | |
wc |= (s[i] & 0x3F) << 18; | |
wc |= (s[i] & 0x3F) << 12; | |
wc |= (s[i] & 0x3F) << 6; | |
wc |= (s[i] & 0x3F); | |
i += 6; | |
} | |
ws += wc; | |
} | |
return ws; | |
} | |
string UnicodeToUTF8( const wstring& ws ) | |
{ | |
string s; | |
for( int i = 0;i < ws.size(); ++i ) | |
{ | |
wchar_t wc = ws[i]; | |
if ( 0 <= wc && wc <= 0x7f ) | |
{ | |
s += (char)wc; | |
} | |
else if ( 0x80 <= wc && wc <= 0x7ff ) | |
{ | |
s += ( 0xc0 | (wc >> 6) ); | |
s += ( 0x80 | (wc & 0x3f) ); | |
} | |
else if ( 0x800 <= wc && wc <= 0xffff ) | |
{ | |
s += ( 0xe0 | (wc >> 12) ); | |
s += ( 0x80 | ((wc >> 6) & 0x3f) ); | |
s += ( 0x80 | (wc & 0x3f) ); | |
} | |
else if ( 0x10000 <= wc && wc <= 0x1fffff ) | |
{ | |
s += ( 0xf0 | (wc >> 18) ); | |
s += ( 0x80 | ((wc >> 12) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 6) & 0x3f) ); | |
s += ( 0x80 | (wc & 0x3f) ); | |
} | |
else if ( 0x200000 <= wc && wc <= 0x3ffffff ) | |
{ | |
s += ( 0xf8 | (wc >> 24) ); | |
s += ( 0x80 | ((wc >> 18) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 12) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 6) & 0x3f) ); | |
s += ( 0x80 | (wc & 0x3f) ); | |
} | |
else if ( 0x4000000 <= wc && wc <= 0x7fffffff ) | |
{ | |
s += ( 0xfc | (wc >> 30) ); | |
s += ( 0x80 | ((wc >> 24) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 18) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 12) & 0x3f) ); | |
s += ( 0x80 | ((wc >> 6) & 0x3f) ); | |
s += ( 0x80 | (wc & 0x3f) ); | |
} | |
} | |
return s; | |
} |
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in layer 5 and 6 the index was not incremented accessing the chars of the UTF8