| 'use strict'; |
| |
| var Buffer = require('buffer').Buffer; |
| /*<replacement>*/ |
| var bufferShim = require('buffer-shims'); |
| /*</replacement>*/ |
| |
| module.exports = BufferList; |
| |
| function BufferList() { |
| this.head = null; |
| this.tail = null; |
| this.length = 0; |
| } |
| |
| BufferList.prototype.push = function (v) { |
| var entry = { data: v, next: null }; |
| if (this.length > 0) this.tail.next = entry;else this.head = entry; |
| this.tail = entry; |
| ++this.length; |
| }; |
| |
| BufferList.prototype.unshift = function (v) { |
| var entry = { data: v, next: this.head }; |
| if (this.length === 0) this.tail = entry; |
| this.head = entry; |
| ++this.length; |
| }; |
| |
| BufferList.prototype.shift = function () { |
| 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; |
| }; |
| |
| BufferList.prototype.clear = function () { |
| this.head = this.tail = null; |
| this.length = 0; |
| }; |
| |
| BufferList.prototype.join = function (s) { |
| if (this.length === 0) return ''; |
| var p = this.head; |
| var ret = '' + p.data; |
| while (p = p.next) { |
| ret += s + p.data; |
| }return ret; |
| }; |
| |
| BufferList.prototype.concat = function (n) { |
| if (this.length === 0) return bufferShim.alloc(0); |
| if (this.length === 1) return this.head.data; |
| var ret = bufferShim.allocUnsafe(n >>> 0); |
| var p = this.head; |
| var i = 0; |
| while (p) { |
| p.data.copy(ret, i); |
| i += p.data.length; |
| p = p.next; |
| } |
| return ret; |
| }; |