add convenience function skip()

README.md

@@ -96,6 +96,11 @@ omitted, a null terminated string is assumed.
 
 Returns the next `bytes` as a buffer.
 
+### reader.skip([bytes])
+
+Skips `bytes` bytes of the buffer.
+
+
 ## Writer API
 
 The Writer has not been implemented yet.

lib/Reader.js

@@ -172,3 +172,10 @@ Reader.prototype.buffer = function(bytes) {
   this._buffer.copy(ret, 0, this._offset -  bytes, this._offset);
   return ret;
 };
+
+Reader.prototype.skip = function(bytes) {
+    if (bytes > this.bytesAhead()) {
+        this.emit('error', new Error('tried to skip outsite of the buffer'));
+    }
+    this._offset += bytes;
+};

test/unit/test-Reader.js

@@ -247,6 +247,13 @@ test('Read Methods', {
     var origResult = reader.buffer(1);
     reader.write(new Buffer([2]));
     assert.deepEqual(origResult, new Buffer([1]));
+  },
+
+  'skip' : function() {
+    var reader = new Reader(new Buffer([1, 2, 3, 4, 5]));
+    reader.skip(2);
+    assert.deepEqual(reader.buffer(3), new Buffer([3, 4, 5]));
+    assert.throws(function() { reader.skip(1); });
   }
 });