58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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"use strict";
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module.exports = {
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/**
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* True if this is running in Nodejs, will be undefined in a browser.
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* In a browser, browserify won't include this file and the whole module
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* will be resolved an empty object.
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*/
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isNode : typeof Buffer !== "undefined",
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/**
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* Create a new nodejs Buffer from an existing content.
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* @param {Object} data the data to pass to the constructor.
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* @param {String} encoding the encoding to use.
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* @return {Buffer} a new Buffer.
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*/
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newBufferFrom: function(data, encoding) {
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if (Buffer.from && Buffer.from !== Uint8Array.from) {
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return Buffer.from(data, encoding);
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} else {
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if (typeof data === "number") {
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// Safeguard for old Node.js versions. On newer versions,
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// Buffer.from(number) / Buffer(number, encoding) already throw.
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throw new Error("The \"data\" argument must not be a number");
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}
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return new Buffer(data, encoding);
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}
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},
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/**
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* Create a new nodejs Buffer with the specified size.
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* @param {Integer} size the size of the buffer.
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* @return {Buffer} a new Buffer.
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*/
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allocBuffer: function (size) {
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if (Buffer.alloc) {
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return Buffer.alloc(size);
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} else {
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var buf = new Buffer(size);
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buf.fill(0);
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return buf;
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}
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},
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/**
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* Find out if an object is a Buffer.
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* @param {Object} b the object to test.
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* @return {Boolean} true if the object is a Buffer, false otherwise.
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*/
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isBuffer : function(b){
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return Buffer.isBuffer(b);
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},
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isStream : function (obj) {
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return obj &&
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typeof obj.on === "function" &&
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typeof obj.pause === "function" &&
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typeof obj.resume === "function";
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}
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};
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