bytespider · June 4, 2011 11:46 · bytespider · Jun 4, 2011 · mikesherov · Jun 5, 2011
diff --git a/annotated.js b/annotated.js
 // http://en.wikipedia.org/wiki/UTF-8

 function stringToByteArray(a,b,c,d,e,f,g,h,i){
    for(
        b = [
            e = 
            d = 0
        ]                                        // initialise variables
        ;
        c = a.charCodeAt(d++)                    // get the character code from the string
        ;
    ){
        g = 128;
        c < g                                    // under 128 is UTF-8 (ASCII range), 1 byte
            ?
            b[e] = c                             // add to byte array
            :
            c < 2048                              // under 2048 2bytes
                ?
                    f = 1                        // number of bytes left to process
                :
                c < 65536                        // under 65536 is 3bytes
                    ?
                        f = 2                    // number of bytes left to process
                    :
                    c < 2<<20 ?                  // finally, under 2097152 is 4bytes
                        f = 3                    // 3bytes left to process
                    :
                    0
                    ;

        for(                                     // process the remaining bytes indicated by `f`
            h = e++,
            i = f
            ;
            f-- > 0                              // -1 and check if greater than 0 still
            ;
            b[h] = g + (2<<(6-i)) + (c >> i*6)   // move onto the next slot in the byte array
        )
            b[e++] = g + (c >> f*6 & 63)         // shift f * 6 bits, mask 1byte and add 128
    }
    return b                                     // return the byte array
 }
diff --git a/index.js b/index.js
 function(a,b,c,d,e,f,g,h,i){for(b=[e=d=0];c=a.charCodeAt(d++);){g=128;c<g?b[e]=c:c<2048?f=1:c<65536?f=2:c<2<<20?f=3:0;for(h=e++,i=f;f-- >0;b[h]=g+(2<<6-i)+(c>>i*6))b[e++]=g+(c>>f*6&63)}return b}
diff --git a/LICENSE.txt b/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.
diff --git a/package.json b/package.json
 {
  "name": "stringToByteArray",

  "description": "Convert a string of characters to an array of UTF-8 bytes",

  "keywords": [
    "cryptography",
    "utf8"
  ]
 }
diff --git a/stringToByteArray.js b/stringToByteArray.js
 function stringToByteArray(str) {
    var bytes = [], code, i;
    
    for(i = 0; i < str.length; i++) {
        code = str.charCodeAt(i);
        
        if (code < 128) {
            bytes.push(code);
        } else if (code < 2048) {
            bytes.push(192+(code>>6), 128+(code&63));
        } else if (code < 65536) {
            bytes.push(224+(code>>12), 128+((code>>6)&63), 128+(code&63));
        } else if (code < 2097152) {
            bytes.push(240+(code>>18), 128+((code>>12)&63), 128+((code>>6)&63), 128+(code&63));
        }
    }
    
    return bytes;
 }
diff --git a/test.html b/test.html
 <!DOCTYPE html> 
 <title>stringToByteArray</title>
 <div>Expected value: <b id="ret"></b></div>
 <div>Actual value: &nbsp;&nbsp;&nbsp;&nbsp;<b id="ret2"></b></div>
 <script>
  // write a small example that shows off the API for your example
  // and tests it in one fell swoop.

  function stringToByteArrayOld(str) {
    var bytes = [], code, i;
    
    for(i = 0; i < str.length; i++) {
        code = str.charCodeAt(i);
        
        if (code < 128) {
            bytes.push(code);
        } else if (code < 2048) {
            bytes.push(192+(code>>6), 128+(code&63));
        } else if (code < 65536) {
            bytes.push(224+(code>>12), 128+((code>>6)&63), 128+(code&63));
        } else if (code < 2097152) {
            bytes.push(240+(code>>18), 128+((code>>12)&63), 128+((code>>6)&63), 128+(code&63));
        }
    }
    
    return bytes;
 }

  function stringToByteArray(a,b,c,d,e,f,g,h,i){for(b=[e=d=0];c=a.charCodeAt(d++);){g=128;c<g?b[e]=c:c<2048?f=1:c<65536?f=2:c<2<<20?f=3:0;for(h=e++,i=f;f-- >0;b[h]=g+(2<<6-i)+(c>>i*6))b[e++]=g+(c>>f*6&63)}return b};

  document.getElementById( "ret" ).innerHTML = stringToByteArrayOld("hello☺䭢 it works")
  document.getElementById( "ret2" ).innerHTML = stringToByteArray("hello☺䭢 it works")
 </script>
	// http://en.wikipedia.org/wiki/UTF-8

	function stringToByteArray(a,b,c,d,e,f,g,h,i){
	for(
	b = [
	e =
	d = 0
	] // initialise variables
	;
	c = a.charCodeAt(d++) // get the character code from the string
	;
	){
	g = 128;
	c < g // under 128 is UTF-8 (ASCII range), 1 byte
	?
	b[e] = c // add to byte array
	:
	c < 2048 // under 2048 2bytes
	?
	f = 1 // number of bytes left to process
	:
	c < 65536 // under 65536 is 3bytes
	?
	f = 2 // number of bytes left to process
	:
	c < 2<<20 ? // finally, under 2097152 is 4bytes
	f = 3 // 3bytes left to process
	:
	0
	;

	for( // process the remaining bytes indicated by `f`
	h = e++,
	i = f
	;
	f-- > 0 // -1 and check if greater than 0 still
	;
	b[h] = g + (2<<(6-i)) + (c >> i*6) // move onto the next slot in the byte array
	)
	b[e++] = g + (c >> f6 & 63) // shift f 6 bits, mask 1byte and add 128
	}
	return b // return the byte array
	}
	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.
	{
	"name": "stringToByteArray",

	"description": "Convert a string of characters to an array of UTF-8 bytes",

	"keywords": [
	"cryptography",
	"utf8"
	]
	}
	function stringToByteArray(str) {
	var bytes = [], code, i;

	for(i = 0; i < str.length; i++) {
	code = str.charCodeAt(i);

	if (code < 128) {
	bytes.push(code);
	} else if (code < 2048) {
	bytes.push(192+(code>>6), 128+(code&63));
	} else if (code < 65536) {
	bytes.push(224+(code>>12), 128+((code>>6)&63), 128+(code&63));
	} else if (code < 2097152) {
	bytes.push(240+(code>>18), 128+((code>>12)&63), 128+((code>>6)&63), 128+(code&63));
	}
	}

	return bytes;
	}
	<!DOCTYPE html>
	<title>stringToByteArray</title>
	<div>Expected value: <b id="ret"></b></div>
	<div>Actual value:     <b id="ret2"></b></div>
	<script>
	// write a small example that shows off the API for your example
	// and tests it in one fell swoop.

	function stringToByteArrayOld(str) {
	var bytes = [], code, i;

	for(i = 0; i < str.length; i++) {
	code = str.charCodeAt(i);

	if (code < 128) {
	bytes.push(code);
	} else if (code < 2048) {
	bytes.push(192+(code>>6), 128+(code&63));
	} else if (code < 65536) {
	bytes.push(224+(code>>12), 128+((code>>6)&63), 128+(code&63));
	} else if (code < 2097152) {
	bytes.push(240+(code>>18), 128+((code>>12)&63), 128+((code>>6)&63), 128+(code&63));
	}
	}

	return bytes;
	}

	function stringToByteArray(a,b,c,d,e,f,g,h,i){for(b=[e=d=0];c=a.charCodeAt(d++);){g=128;c<g?b[e]=c:c<2048?f=1:c<65536?f=2:c<2<<20?f=3:0;for(h=e++,i=f;f-- >0;b[h]=g+(2<<6-i)+(c>>i6))b[e++]=g+(c>>f6&63)}return b};

	document.getElementById( "ret" ).innerHTML = stringToByteArrayOld("hello☺䭢 it works")
	document.getElementById( "ret2" ).innerHTML = stringToByteArray("hello☺䭢 it works")
	</script>