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'use strict';
const Buffer = require('buffer').Buffer;
function copyBuffer(src, target, offset) {
Buffer.prototype.copy.call(src, target, offset);
}
module.exports = class BufferList {
constructor() {
this.head = null;
this.tail = null;
this.length = 0;
}
push(v) {
const entry = { data: v, next: null };
if (this.length > 0)
this.tail.next = entry;
else
this.head = entry;
this.tail = entry;
++this.length;
}
unshift(v) {
const entry = { data: v, next: this.head };
if (this.length === 0)
this.tail = entry;
this.head = entry;
++this.length;
}
shift() {
if (this.length === 0)
return;
const 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;
const 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;
}
};
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