64 lines
1.4 KiB
JavaScript
64 lines
1.4 KiB
JavaScript
'use strict';
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var Buffer = require('buffer').Buffer;
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/*<replacement>*/
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var bufferShim = require('buffer-shims');
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/*</replacement>*/
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module.exports = BufferList;
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function 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 (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 (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 () {
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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 () {
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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 (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 (n) {
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if (this.length === 0) return bufferShim.alloc(0);
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if (this.length === 1) return this.head.data;
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var ret = bufferShim.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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p.data.copy(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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}; |