Merge pull request #182 from jsnajdr/speedup-entry-buffer

BufferStream: improve performance by running concat only once at the end

lib/BufferStream.js

@@ -8,18 +8,18 @@ if (!Stream.Writable || !Stream.Writable.prototype.destroy)
 
 module.exports = function(entry) {
   return new Promise(function(resolve,reject) {
-    var buffer = Buffer.from(''),
-        bufferStream = Stream.Transform()
-          .on('finish',function() {
-            resolve(buffer);
-          })
-          .on('error',reject);
+    var chunks = [];
+    var bufferStream = Stream.Transform()
+      .on('finish',function() {
+        resolve(Buffer.concat(chunks));
+      })
+      .on('error',reject);
 
     bufferStream._transform = function(d,e,cb) {
-      buffer = Buffer.concat([buffer,d]);
+      chunks.push(d);
       cb();
     };
     entry.on('error',reject)
       .pipe(bufferStream);
   });
-};
+};