Fix deprecated Buffer constructor usage and add safeguards

lib/nodejsUtils.js

@@ -14,13 +14,16 @@ module.exports = {
      * @return {Buffer} a new Buffer.
      */
     newBufferFrom: function(data, encoding) {
-        // XXX We can't use `Buffer.from` which comes from `Uint8Array.from`
-        // in nodejs v4 (< v.4.5). It's not the expected implementation (and
-        // has a different signature).
-        // see https://github.com/nodejs/node/issues/8053
-        // A condition on nodejs' version won't solve the issue as we don't
-        // control the Buffer polyfills that may or may not be used.
-        return new Buffer(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.
@@ -31,7 +34,9 @@ module.exports = {
         if (Buffer.alloc) {
             return Buffer.alloc(size);
         } else {
-            return new Buffer(size);
+            var buf = new Buffer(size);
+            buf.fill(0);
+            return buf;
         }
     },
     /**