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tsaniel/LICENSE.txt

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Created July 16, 2011 14:07
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UTF8 encoder
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README.md

UTF8 encoder

A simple UTF8 encoder.

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annotated.js
function(
a, // the text
b, // String.fromCharCode
c, // placeholder
d, // placeholder
e // placeholder
){
for (c=e=''; d=a.charCodeAt(c++); ) // get the Unicode value of the current character
e += d < 128 ? // U+0000-U+007F
b(d) : // 0xxxxxxx
(d < 2048 ? // U+0080-U+07FF
b(d >> 6 | 192) : // 110xxxxx
b(d >> 12 | 224, d >> 6 & 63 | 128) // U+0800-U+FFFF 1110xxxx 10xxxxxx
) + b(d & 63 | 128); // 10xxxxxx
return e;
}
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index.js
function(a,b,c,d,e){for(c=0,e="";d=a.charCodeAt(c++);)e+=d<128?b(d):(d<2048?b(d>>6|192):b(d>>12|224,d>>6&63|128))+b(d&63|128);return e}
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LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
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package.json
{
"name": "utf8encoder",
"description": "A simple UTF8 encoder.",
"keywords": [
"utf8",
"utf-8",
"encode",
"encoder",
"unicode"
]
}
Raw
test.html
<!DOCTYPE html>
<title>UTF8 encode</title>
<div>Expected value: <b>Normal text</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
var myFunction = function(a,b,c,d,e){for(c=0,e="";d=a.charCodeAt(c++);)e+=d<128?b(d):(d<2048?b(d>>6|192):b(d>>12|224)+b(d>>6&63|128))+b(d&63|128);return e};
document.getElementById( "ret" ).innerHTML = myFunction('Normal text', String.fromCharCode);
</script>
@jed
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jed commented Jul 19, 2011

also, can you exploit the fact that String.fromCharCode(a,null) === String.fromCharCode(a) ?

@tsaniel
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tsaniel commented Jul 19, 2011

Thanks for your tips, @jed! I think eval is good, but it seems couldn't save bytes with d>>6.
Anyways, that fact is really awesome. I'm still thinking how to exploit it...

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