How to convert large UTF-8 strings into ASCII?

Question

I need to convert large UTF-8 strings into ASCII. It should be reversible, and ideally a quick/lightweight algorithm.

How can I do this? I need the source

Answer 1

Here is a function to convert UTF8 accents to ASCII Accents (àéèî etc) If there is an accent in the string it's converted to %239 for exemple Then on the other side, I parse the string and I know when there is an accent and what is the ASCII char.

I used it in a javascript software to send data to a microcontroller that works in ASCII.

convertUtf8ToAscii = function (str) {
    var asciiStr = "";
    var refTable = { // Reference table Unicode vs ASCII
        199: 128, 252: 129, 233: 130, 226: 131, 228: 132, 224: 133, 231: 135, 234: 136, 235: 137, 232: 138,
        239: 139, 238: 140, 236: 141, 196: 142, 201: 144, 244: 147, 246: 148, 242: 149, 251: 150, 249: 151
    };
    for(var i = 0; i < str.length; i++){
        var ascii = refTable[str.charCodeAt(i)];
        if (ascii != undefined)
            asciiStr += "%" +ascii;
        else
            asciiStr += str[i];
    }
    return asciiStr;
}