Added gzip helper option.

lib/modules/tar/index.js

@@ -7,14 +7,16 @@
  */
 var inherits = require('util').inherits;
 var Transform = require('stream').Transform || require('readable-stream').Transform;
+var zlib = require('zlib');
 
 var headers = require('./headers');
 var util = require('../../util');
 
 var Tar = module.exports = function(options) {
   options = this.options = util.defaults(options, {
     recordSize: 512,
-    recordsPerBlock: 20
+    recordsPerBlock: 20,
+    gzip: false
   });
 
   Transform.call(this, options);
@@ -24,6 +26,11 @@ var Tar = module.exports = function(options) {
 
   this.recordSize = options.recordSize;
   this.blockSize = options.recordsPerBlock * options.recordSize;
+  this.gzip = options.gzip;
+
+  if (this.gzip) {
+    this.gzipper = zlib.createGzip();
+  }
 };
 
 inherits(Tar, Transform);
@@ -95,4 +102,14 @@ Tar.prototype.write = function(chunk, cb) {
   }
 
   return Transform.prototype.write.call(this, chunk, cb);
+};
+
+Tar.prototype.pipe = function(destination, options) {
+  if (this.gzip && this.gzipper) {
+    // Pipe to gzip stream before piping to destination
+    return Transform.prototype.pipe.call(this, this.gzipper, options).pipe(destination);
+  } else {
+    // Pipe to the destination like normal
+    return Transform.prototype.pipe.call(this, destination, options)
+  }
 };