> Is it possible to write a Unicode encoded text file with JSFL?
Yes, absolutely. Except that there's no such thing as a 'Unicode encoded
text file' - there are a number of different encodings all of which refer to
Unicode mappings in different ways, the most common of which is probably
UTF-8.
> If so how can I do it?
Well, for starters here's a function that will translate a string into an
array of UTF-8 values. To write it out as a text file, just convert each
number to a character using String.fromCharCode.
function getUTFArray(tString:String) {
var tRes:Array = new Array();
var tCode:Number;
for (var i = 0; i < tString.length; i++) {
tCode = tString.charCodeAt(i);
if (tCode < 128) {
// One-byte (ASCII) range: 7 bits
tRes.push(tCode);
} else if (tCode < 0x800) {
// Two-byte range: 11 bits
var tTop = (tCode >> 6);
// top 5 bits xxxxx
var tCode1 = tTop + 192;
// becomes 110xxxxx
var tCode2 = tCode - (tTop << 6) + 128;
// subtract off top bits to get 10yyyyyy
tRes.push(tCode1);
tRes.push(tCode2);
} else if (tCode < 0x10000) {
// Three-byte range: 16 bits
var tTop = (tCode >> 12);
// top 4 bits
var tRem = tCode - (tTop << 12);
var tMiddle = (tRem >> 6);
// middle 6 bits
var tBottom = tRem - (tMiddle << 6);
var tCode1 = tTop + 224;
// becomes 1110xxxx
var tCode2 = tMiddle + 128;
// becomes 10xxxxxx
var tCode3 = tBottom + 128;
// becomes 10xxxxxx
tRes.push(tCode1);
tRes.push(tCode2);
tRes.push(tCode3);
} else {
// Four-byte range: 21 bits (fairly unlikely! Is
this Klingon?)
var tTop = (tCode >> 18);
// top 3 bits
var tRem = tCode - (tTop << 18);
var tMiddleTop = (tRem >> 12);
// next 6 bits
tRem -= (tMiddleTop << 12);
var tMiddleBottom = (tRem >> 6);
// next 6 bits
var tBottom = tRem - (tMiddleBottom << 6);
var tCode1 = tTop + 240;
// becomes 11110xxx
var tCode2 = tMiddleTop + 128;
// becomes 10xxxxxx
var tCode3 = tMiddleBottom + 128;
// becomes 10xxxxxx
var tCode4 = tBottom + 128;
// becomes 10xxxxxx
tRes.push(tCode1);
tRes.push(tCode2);
tRes.push(tCode3);
tRes.push(tCode4);
}
}
return tRes;
}
HTH
Danny
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