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export class Utils {
static createKey(keyLength: number){
let keyspace: String = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
let text = '';
let index;
for (let i = 0; i < keyLength; i++)
{
index = Math.floor(Math.random() * keyspace.length);
text += keyspace.charAt(index);
}
return text;
}
static toUTF8Array(str) {
let utf8 = [];
for (var i=0; i < str.length; i++) {
let 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++;
charcode = ((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;
}
}
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