functions for binary strings

binstr.js

/* little endian parser */
function lit2int(str){
	var ret=0;
	for(var i=str.length-1;i>=0;i--){
		ret=ret*256+(str.charCodeAt(i)&0xff);
	}
	return ret;
}

/* big endian parser */

function bin2int(str){
	var ret=0;
	for(var i=0;i<str.length;i++){
		ret=ret*256 + (str.charCodeAt(i)&0xff);
	}
	return ret;
}

function js_enconv(e){
	return bin2utf8(e)||cp12512utf8(e);
}

/**
*
*  UTF-8 data decode
*  http://www.webtoolkit.info/
*
**/

function bin2utf8(utftext) {
	var string = "";
	var i = 0;
	var c = c1 = c2 = 0;

	while ( i < utftext.length ) {

		c = utftext.charCodeAt(i);
	
		if (c < 128) {
			string += String.fromCharCode(c);
			i++;
		}else if((c > 191) && (c < 224)) {
			c2 = utftext.charCodeAt(i+1);
			if(c2>0xDF){//this is exeption!
				console.log("illegal character sequence at "+i);
				return null;
			}
			string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
			i += 2;
		}else {
			c2 = utftext.charCodeAt(i+1);
			c3 = utftext.charCodeAt(i+2);
			if(c2>0xBF||c3>0xBF){
				console.log("illegal character sequence at "+i);
				return null;
			}
			string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
			i += 3;
		}
	}

	return string;
}

function cp12512utf8 (cp12) {
	var alphabet="ЂЃ‚ѓ„…†‡€‰Љ‹ЊЌЋЏђ‘’“”•–—˜™љ›њќћџ ЎўЈ¤Ґ¦§Ё©Є«¬­®Ї°±Ііґµ¶·ё№є»јЅѕї"
            +"АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя"
	var ret="";
	var c;
	for(var i=0;i<cp12.length;i++){
		c=cp12.charCodeAt(i)&255;
		if(c<0x80){
			ret+=String.fromCharCode(c);
		}else{
			ret+=alphabet.charAt(c-0x80);
		}
	}
	return ret;
}

function cp8662utf(cp8){
	var alphabet="АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмноп░▒▓│┤╡╢╖╕╣║╗╝╜╛┐"
		+"└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀рстуфхцчшщъыьэюяЁёЄєЇїЎў°∙·√№¤■ ";
	var ret="";
	var c;
	for(var i=0;i<cp8.length;i++){
		c=cp8.charCodeAt(i)&255;
		if(c<0x80){
			ret+=String.fromCharCode(c);
		}else{
			ret+=alphabet.charAt(c-0x80);
		}
	}
	return ret;
}