These are functions to encode and decode data to and from the Base64 format.
The original code is from this github repository: https://github.com/AxisCommunications/arduino-websocket-server/blob/master/Base64.cpp.
There are two functions: one for encode and one for decode:
int encoded_lenght = base64_encode( char *data_out, char *data_in, int data_in_lenght );
int decoded_lenght = base64_decode( char *data_out, char *data_in, int data_in_lenght );
I've used the Sming framework for the ESP8266, but the code should be portable to other architectures and frameworks:
char b64data[256]; // Size is just an example.
String s = "Hello world!";
Serial.println(" Message: " );
Serial.println( s) ;
Serial.println(" Encoded message:");
int b64len = base64_encode(b64data, (char *)s.c_str(),s.length());
Serial.println ( String(b64data) );
Serial.println ("The lenght is: " + String(b64len) );
char decoded[256];
String ss(b64data);
base64_decode( decoded , (char *)ss.c_str() , ss.length() );
Serial.println("Decoded: " + String(decoded));
or
base64_decode( decodec, b64data, b64len);
Serial.println("Decoded: " + String(decoded));
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