@svta/common-media-library
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A common library for media playback in JavaScript
80 lines • 2.38 kB
JavaScript
;
// http://stackoverflow.com/questions/8936984/uint8array-to-string-in-javascript/22373197
// http://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt
/* utf.js - UTF-8 <=> UTF-16 convertion
*
* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
* Version: 1.0
* LastModified: Dec 25 1999
* This library is free. You can redistribute it and/or modify it.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.utf8ArrayToStr = utf8ArrayToStr;
/**
* Converts a UTF-8 array to a string.
*
* @param array - The UTF-8 array to convert
*
* @returns The string
*
* @group Utils
*
* @beta
*/
function utf8ArrayToStr(array, exitOnNull = false) {
if (typeof TextDecoder !== 'undefined') {
const decoder = new TextDecoder('utf-8');
const decoded = decoder.decode(array);
if (exitOnNull) {
// grab up to the first null
const idx = decoded.indexOf('\0');
return idx !== -1 ? decoded.substring(0, idx) : decoded;
}
// remove any null characters
return decoded.replace(/\0/g, '');
}
const len = array.length;
let c;
let char2;
let char3;
let out = '';
let i = 0;
while (i < len) {
c = array[i++];
if (c === 0x00 && exitOnNull) {
return out;
}
else if (c === 0x00 || c === 0x03) {
// If the character is 3 (END_OF_TEXT) or 0 (NULL) then skip it
continue;
}
switch (c >> 4) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12:
case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0));
break;
default:
}
}
return out;
}
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