nodejsUtils.js•1.89 kB
"use strict";
module.exports = {
/**
* True if this is running in Nodejs, will be undefined in a browser.
* In a browser, browserify won't include this file and the whole module
* will be resolved an empty object.
*/
isNode : typeof Buffer !== "undefined",
/**
* Create a new nodejs Buffer from an existing content.
* @param {Object} data the data to pass to the constructor.
* @param {String} encoding the encoding to use.
* @return {Buffer} a new Buffer.
*/
newBufferFrom: function(data, encoding) {
if (Buffer.from && Buffer.from !== Uint8Array.from) {
return Buffer.from(data, encoding);
} else {
if (typeof data === "number") {
// Safeguard for old Node.js versions. On newer versions,
// Buffer.from(number) / Buffer(number, encoding) already throw.
throw new Error("The \"data\" argument must not be a number");
}
return new Buffer(data, encoding);
}
},
/**
* Create a new nodejs Buffer with the specified size.
* @param {Integer} size the size of the buffer.
* @return {Buffer} a new Buffer.
*/
allocBuffer: function (size) {
if (Buffer.alloc) {
return Buffer.alloc(size);
} else {
var buf = new Buffer(size);
buf.fill(0);
return buf;
}
},
/**
* Find out if an object is a Buffer.
* @param {Object} b the object to test.
* @return {Boolean} true if the object is a Buffer, false otherwise.
*/
isBuffer : function(b){
return Buffer.isBuffer(b);
},
isStream : function (obj) {
return obj &&
typeof obj.on === "function" &&
typeof obj.pause === "function" &&
typeof obj.resume === "function";
}
};