@fnlb-project/stanza
Version:
Modern XMPP in the browser, with a JSON API
69 lines (68 loc) • 1.67 kB
JavaScript
'use strict';
var Buffer = require('../../../../buffer').Buffer;
function copyBuffer(src, target, offset) {
src.copy(target, offset);
}
exports.BufferList = class BufferList {
constructor() {
this.head = null;
this.tail = null;
this.length = 0;
}
push(v) {
var entry = { data: v, next: null };
if (this.length > 0)
this.tail.next = entry;
else
this.head = entry;
this.tail = entry;
++this.length;
}
unshift(v) {
var entry = { data: v, next: this.head };
if (this.length === 0)
this.tail = entry;
this.head = entry;
++this.length;
}
shift() {
if (this.length === 0)
return;
var ret = this.head.data;
if (this.length === 1)
this.head = this.tail = null;
else
this.head = this.head.next;
--this.length;
return ret;
}
clear() {
this.head = this.tail = null;
this.length = 0;
}
join(s) {
if (this.length === 0)
return '';
var p = this.head;
var ret = '' + p.data;
while ((p = p.next)) {
ret += s + p.data;
}
return ret;
}
concat(n) {
if (this.length === 0)
return Buffer.alloc(0);
if (this.length === 1)
return this.head.data;
var ret = Buffer.allocUnsafe(n >>> 0);
var p = this.head;
var i = 0;
while (p) {
copyBuffer(p.data, ret, i);
i += p.data.length;
p = p.next;
}
return ret;
}
};