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String: Add fromUtf8ToEAscii. #177

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String: Add fromUtf8ToEAscii. #177

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8e3d27a
String: Add fromUtf8ToEAscii.
JunioCesarFerreira Jan 11, 2023
4b150cc
Merge tag '1.5.0' into feature/fromUtf8ToEAscii-method-in-String
JunioCesarFerreira May 13, 2024
0691812
Merge tag '1.5.1' into feature/fromUtf8ToEAscii-method-in-String
JunioCesarFerreira May 13, 2024
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34 changes: 34 additions & 0 deletions api/String.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -747,4 +747,38 @@ double String::toDouble(void) const
return 0;
}

String String::fromUtf8ToEAscii(void) const
{
/*
* references :
* https://www.ime.usp.br/~pf/algoritmos/apend/unicode.html
* https://www.utf8-chartable.de/unicode-utf8-table.pl
* https://bjoern.hoehrmann.de/utf-8/decoder/dfa/
*/
String eAsciiString;
for (uint8_t i=0; i< length(); i++)
{
uint8_t byteScope = (uint8_t)buffer[i];
if (byteScope < 0x7F)
{
eAsciiString += buffer[i];
}
else if (byteScope == 0xC3)
{
i++;
byteScope = (uint8_t)buffer[i];
if (byteScope > 0x7F)
eAsciiString += (char)(byteScope+0x40);
}
else if (byteScope == 0xC2)
{
i++;
byteScope = (uint8_t)buffer[i];
if (byteScope > 0x7F)
eAsciiString += (char)(byteScope);
}
}
return eAsciiString;
}

} // namespace arduino
1 change: 1 addition & 0 deletions api/String.h
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,7 @@ class String
long toInt(void) const;
float toFloat(void) const;
double toDouble(void) const;
String fromUtf8ToEAscii(void) const;

protected:
char *buffer; // the actual char array
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