diff --git a/api/String.cpp b/api/String.cpp
index 4f176374..2423584c 100644
--- a/api/String.cpp
+++ b/api/String.cpp
@@ -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
diff --git a/api/String.h b/api/String.h
index 0bafd35a..11a83b4a 100644
--- a/api/String.h
+++ b/api/String.h
@@ -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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