[DHTML] ActiveX Simplified

**djr33** · 07-17-2007, 04:57 AM

Haha.

I'll be wondering what's keeping him busy til he arrives

**Trinithis** · 07-17-2007, 09:05 PM

Here are better versions of your text converters:

Code:

function $ToBinary(text) {
	var binText = "", ch = "", bin;
	for(var i=0, n=text.length; i<n; ++i) {
		ch = text.charAt(i);
		bin = ch.charCodeAt(0).toString(2);
		while(bin.length<8) bin = "0" + bin;
		binText += bin;
		}
	return binText;
	}

function $ToAscii(binText) {
	var text = "", bin, dec;
	if (binText.length&#37;8!=0) return false;
	for(var i=0, n=binText.length/8; i<n; ++i) {
		bin = binText.substr(8*i, 8);
		dec = 0;
		for(var j=0; j<8; ++j) dec += Math.pow(2, j) * bin.charAt(7-j);
		text += String.fromCharCode(dec);
		}
	return text;
	}

You could also support full unicode if you wanted:

Code:

function $ToBinary(text) {
	var binText = "", ch = "", bin;
	for(var i=0, n=text.length; i<n; ++i) {
		ch = text.charAt(i);
		bin = ch.charCodeAt(0).toString(2);
		while(bin.length<16) bin = "0" + bin;
		binText += bin;
		}
	return binText;
	}

function $ToUnicode(binText) {
	var text = "", bin, dec;
	if (binText.length%16!=0) return false;
	for(var i=0, n=binText.length/16; i<n; ++i) {
		bin = binText.substr(16*i, 16);
		dec = 0;
		for(var j=0; j<16; ++j) dec += Math.pow(2, j) * bin.charAt(15-j);
		text += String.fromCharCode(dec);
		}
	return text;
	}

I'm not sure why your version converts "\n" to "00000000" instead of "00001010", so I took it out. But if you really need it to be like that, add the following to $ToBinary's for loop right after you assign (ch):

Code:

if(ch=="\n") {
	binText += "00000000";
	continue;
	}

and this to $ToAscii's outer for loop right after you assign (bin):

Code:

if(bin=="00000000") {
	text += "\n";
	continue;
	}

**Twey** · 07-17-2007, 11:12 PM

By "full Unicode" I presume you mean UTF-16. Remember, UTF-8 and UTF-32 exist as well.

**Trinithis** · 07-17-2007, 11:31 PM

Yep, that's what I mean, but if I'm not mistaken, JS uses UTF-16 anyway

**Twey** · 07-17-2007, 11:49 PM

Code:

js> for(var x in "あ") print("あ".charCodeAt(x).toString(2));
11100011
10000001
10000010

I believe it uses whatever encoding it's fed. Here we see it using UTF-8, but my console was in UTF-8.

**Trinithis** · 07-18-2007, 05:11 AM

Could you explain how your code works?

The js> is unfamiliar. (Perhaps a link if need be.)

As is using the for-in like that. Shouldn't there only be 1 charCodeAt(i) because the string is only 1 character long?

**djr33** · 07-18-2007, 05:13 AM

I think that is simply the line of javascript, with 'js>' just showing you that that line is js, and that the output of that line is written below. I don't think that's a command. If so, I'm just as lost as you are

**Twey** · 07-18-2007, 11:50 AM

The js> is unfamiliar.

It's just the Spidermonkey command-line interpreter. You type code, it gives results. No great mystery.

As is using the for-in like that.

Don't do this normally, it's not at all portable. Javascript allows (but JScript doesn't allow) us to treat strings as arrays and loop through or access individual characters as we would elements of an array.

Shouldn't there only be 1 charCodeAt(i) because the string is only 1 character long?

It's looping through all three bytes of the character. In UTF-16, that character is only two bytes long; in UTF-8, it's three (thus, UTF-16 is preferred for content with lots of multibyte characters).

**magicgavin** · 07-18-2007, 12:12 PM

I didn't know the binary code for \n so I just use one that was open.

**Twey** · 07-18-2007, 12:20 PM

Dear gods! You do realise that you can convert a single-byte character to binary by doing:

Code:

this.let.charAt(0).toString(2);

... didn't you? And what's with the this.x, this.y? this in this case is window, since the functions weren't called as properties of anything. Those are unnecessarily globals, and the this. bit is redundant.

Code:

function frontPad(s, len, chr) {
  for(var r = s.toString(); r.length < len; r = (chr || "0") + r);
  return r;
}

function group(arr, len) {
  for(var i = 0, r = [], n = arr.length; i < n; ++i) {
    if(i % len === 0)
      r.push([]);
    r[r.length - 1].push(arr[i]);
  }
  return r;
}

function StrToBin(str, charsiz) { // I refuse to use $.
  for(var i = -1, r = "", n = str.length - 1; i < n; r += frontPad(str.charCodeAt(++i).toString(2), charsiz || 8));
  return r;
}

function BinToStr(bin, charsiz) {
  for(var i = 0, cs = group(bin.split(""), charsiz || 8), n = cs.length; i < n; cs[i] = String.fromCharCode(parseInt(cs[i++].join(""), 2)));
  return cs.join("");
}

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