Created
January 16, 2014 17:42
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utf8 decoder
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function jutf8_decode (str_data) { | |
// http://kevin.vanzonneveld.net | |
// + original by: Webtoolkit.info (http://www.webtoolkit.info/) | |
// + input by: Aman Gupta | |
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) | |
// + improved by: Norman "zEh" Fuchs | |
// + bugfixed by: hitwork | |
// + bugfixed by: Onno Marsman | |
// + input by: Brett Zamir (http://brett-zamir.me) | |
// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) | |
// + bugfixed by: kirilloid | |
// * example 1: utf8_decode('Kevin van Zonneveld'); | |
// * returns 1: 'Kevin van Zonneveld' | |
var tmp_arr = [], | |
i = 0, | |
ac = 0, | |
c1 = 0, | |
c2 = 0, | |
c3 = 0, | |
c4 = 0; | |
str_data += ''; | |
while (i < str_data.length) { | |
c1 = str_data.charCodeAt(i); | |
if (c1 <= 191) { | |
tmp_arr[ac++] = String.fromCharCode(c1); | |
i++; | |
} else if (c1 <= 223) { | |
c2 = str_data.charCodeAt(i + 1); | |
tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63)); | |
i += 2; | |
} else if (c1 <= 239) { | |
// http://en.wikipedia.org/wiki/UTF-8#Codepage_layout | |
c2 = str_data.charCodeAt(i + 1); | |
c3 = str_data.charCodeAt(i + 2); | |
tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); | |
i += 3; | |
} else { | |
c2 = str_data.charCodeAt(i + 1); | |
c3 = str_data.charCodeAt(i + 2); | |
c4 = str_data.charCodeAt(i + 3); | |
c1 = ((c1 & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63); | |
c1 -= 0x10000; | |
tmp_arr[ac++] = String.fromCharCode(0xD800 | ((c1>>10) & 0x3FF)); | |
tmp_arr[ac++] = String.fromCharCode(0xDC00 | (c1 & 0x3FF)); | |
i += 4; | |
} | |
} | |
return tmp_arr.join(''); | |
} |
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