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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