Fucntion to convert to UTF8 byte array:
function toUTF8Array(str) { | |
var utf8 = []; | |
for (var i=0; i < str.length; i++) { | |
var charcode = str.charCodeAt(i); | |
if (charcode < 0x80) utf8.push(charcode); | |
else if (charcode < 0x800) { | |
utf8.push(0xc0 | (charcode >> 6), | |
0x80 | (charcode & 0x3f)); | |
} | |
else if (charcode < 0xd800 || charcode >= 0xe000) { | |
utf8.push(0xe0 | (charcode >> 12), | |
0x80 | ((charcode>>6) & 0x3f), | |
0x80 | (charcode & 0x3f)); | |
} | |
// surrogate pair | |
else { | |
i++; | |
// UTF-16 encodes 0x10000-0x10FFFF by | |
// subtracting 0x10000 and splitting the | |
// 20 bits of 0x0-0xFFFFF into two halves | |
charcode = 0x10000 + (((charcode & 0x3ff)<<10) | |
| (str.charCodeAt(i) & 0x3ff)) | |
utf8.push(0xf0 | (charcode >>18), | |
0x80 | ((charcode>>12) & 0x3f), | |
0x80 | ((charcode>>6) & 0x3f), | |
0x80 | (charcode & 0x3f)); | |
} | |
} | |
return utf8; | |
} |
Function to convert from UTF8 byte array to String:
JavaScript: Correctly Converting a Byte Array to a UTF-8 String
For base64:
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