'use strict';
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var Buffer = require('safe-buffer').Buffer;
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var util = require('util');
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function copyBuffer(src, target, offset) {
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src.copy(target, offset);
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}
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module.exports = function () {
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function BufferList() {
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_classCallCheck(this, BufferList);
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this.head = null;
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this.tail = null;
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this.length = 0;
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}
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BufferList.prototype.push = function push(v) {
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var entry = { data: v, next: null };
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if (this.length > 0) this.tail.next = entry;else this.head = entry;
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this.tail = entry;
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++this.length;
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};
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BufferList.prototype.unshift = function unshift(v) {
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var entry = { data: v, next: this.head };
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if (this.length === 0) this.tail = entry;
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this.head = entry;
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++this.length;
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};
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BufferList.prototype.shift = function shift() {
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if (this.length === 0) return;
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var ret = this.head.data;
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if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
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--this.length;
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return ret;
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};
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BufferList.prototype.clear = function clear() {
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this.head = this.tail = null;
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this.length = 0;
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};
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BufferList.prototype.join = function join(s) {
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if (this.length === 0) return '';
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var p = this.head;
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var ret = '' + p.data;
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while (p = p.next) {
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ret += s + p.data;
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}return ret;
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};
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BufferList.prototype.concat = function concat(n) {
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if (this.length === 0) return Buffer.alloc(0);
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if (this.length === 1) return this.head.data;
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var ret = Buffer.allocUnsafe(n >>> 0);
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var p = this.head;
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var i = 0;
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while (p) {
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copyBuffer(p.data, ret, i);
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i += p.data.length;
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p = p.next;
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}
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return ret;
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};
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return BufferList;
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}();
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if (util && util.inspect && util.inspect.custom) {
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module.exports.prototype[util.inspect.custom] = function () {
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var obj = util.inspect({ length: this.length });
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return this.constructor.name + ' ' + obj;
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};
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}
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