Template:Groningen/eightbit js

var EightBit = {};

(function(){ // source: http://ecmanaut.blogspot.nl/2006/07/encoding-decoding-utf8-in-javascript.html var encodeUtf8 = function(s){ return unescape(encodeURIComponent(s)); }; var decodeUtf8 = function(s){ return decodeURIComponent(escape(s)); };

var encChr = function(chr){ var code = chr.charCodeAt(0); if(code < 0 || code > 255){ // beyond 8 bit return null; }

return DNA.padUInt(DNA.encodeUInt(code), 4); };

var encodeChar = function(str){ return encodeStr(str); };

var decodeChar = function(dna){ return String.fromCharCode(DNA.decodeUInt(dna)); };

var encodeStr = function(str){ str = encodeUtf8(str); var ret = ;

for(var i = 0; i < str.length; i++){ var chr = encChr(str[i]); if(chr === null){ return null; } ret += chr; }

return ret; };

var decodeStr = function(dna){ var ret = ;

for(var i = 0; i < dna.length; i += 4){ var chr = decodeChar(dna.substr(i, 4)); if(chr === null){ return null; } ret += chr; }

return decodeUtf8(ret); };

EightBit = { 'encodeChar': encodeChar, 'decodeChar': decodeChar, 'encodeStr': encodeStr, 'decodeStr': decodeStr }; })();