3 files changed, 48 insertions, 12 deletions
diff --git a/storage/filesystem/dotgit/dotgit.go b/storage/filesystem/dotgit/dotgit.go
index dc12f23..af07eb5 100644
--- a/storage/filesystem/dotgit/dotgit.go
+++ b/storage/filesystem/dotgit/dotgit.go
@@ -784,6 +784,11 @@ func (d *DotGit) Alternates() ([]*DotGit, error) {
 	return alternates, nil
 }
 
+// Fs returns the underlying filesystem of the DotGit folder.
+func (d *DotGit) Fs() billy.Filesystem {
+	return d.fs
+}
+
 func isHex(s string) bool {
 	for _, b := range []byte(s) {
 		if isNum(b) {
diff --git a/storage/filesystem/object.go b/storage/filesystem/object.go
index 86d0da9..6958e32 100644
--- a/storage/filesystem/object.go
+++ b/storage/filesystem/object.go
@@ -295,12 +295,7 @@ func (s *ObjectStorage) decodeObjectAt(
 		return nil, err
 	}
 
-	obj, err := packfile.NewPackfile(idx, f).GetByOffset(offset)
-	if err != nil {
-		return nil, err
-	}
-
-	return packfile.MemoryObjectFromDisk(obj)
+	return packfile.NewPackfile(idx, s.dir.Fs(), f).GetByOffset(offset)
 }
 
 func (s *ObjectStorage) decodeDeltaObjectAt(
@@ -404,7 +399,7 @@ func (s *ObjectStorage) buildPackfileIters(t plumbing.ObjectType, seen map[plumb
 			if err != nil {
 				return nil, err
 			}
-			return newPackfileIter(pack, t, seen, s.index[h], s.deltaBaseCache)
+			return newPackfileIter(s.dir.Fs(), pack, t, seen, s.index[h], s.deltaBaseCache)
 		},
 	}, nil
 }
@@ -466,6 +461,7 @@ type packfileIter struct {
 // and object type. Packfile and index file will be closed after they're
 // used.
 func NewPackfileIter(
+	fs billy.Filesystem,
 	f billy.File,
 	idxFile billy.File,
 	t plumbing.ObjectType,
@@ -479,17 +475,18 @@ func NewPackfileIter(
 		return nil, err
 	}
 
-	return newPackfileIter(f, t, make(map[plumbing.Hash]struct{}), idx, nil)
+	return newPackfileIter(fs, f, t, make(map[plumbing.Hash]struct{}), idx, nil)
 }
 
 func newPackfileIter(
+	fs billy.Filesystem,
 	f billy.File,
 	t plumbing.ObjectType,
 	seen map[plumbing.Hash]struct{},
 	index idxfile.Index,
 	cache cache.Object,
 ) (storer.EncodedObjectIter, error) {
-	iter, err := packfile.NewPackfile(index, f).GetByType(t)
+	iter, err := packfile.NewPackfile(index, fs, f).GetByType(t)
 	if err != nil {
 		return nil, err
 	}
diff --git a/storage/filesystem/object_test.go b/storage/filesystem/object_test.go
index 88f22bf..b1408b7 100644
--- a/storage/filesystem/object_test.go
+++ b/storage/filesystem/object_test.go
@@ -121,7 +121,7 @@ func (s *FsSuite) TestPackfileIter(c *C) {
 				idxf, err := dg.ObjectPackIdx(h)
 				c.Assert(err, IsNil)
 
-				iter, err := NewPackfileIter(f, idxf, t)
+				iter, err := NewPackfileIter(fs, f, idxf, t)
 				c.Assert(err, IsNil)
 				err = iter.ForEach(func(o plumbing.EncodedObject) error {
 					c.Assert(o.Type(), Equals, t)
@@ -169,7 +169,7 @@ func BenchmarkPackfileIter(b *testing.B) {
 							b.Fatal(err)
 						}
 
-						iter, err := NewPackfileIter(f, idxf, t)
+						iter, err := NewPackfileIter(fs, f, idxf, t)
 						if err != nil {
 							b.Fatal(err)
 						}
@@ -225,7 +225,7 @@ func BenchmarkPackfileIterReadContent(b *testing.B) {
 							b.Fatal(err)
 						}
 
-						iter, err := NewPackfileIter(f, idxf, t)
+						iter, err := NewPackfileIter(fs, f, idxf, t)
 						if err != nil {
 							b.Fatal(err)
 						}
@@ -256,3 +256,37 @@ func BenchmarkPackfileIterReadContent(b *testing.B) {
 		})
 	}
 }
+
+func BenchmarkGetObjectFromPackfile(b *testing.B) {
+	if err := fixtures.Init(); err != nil {
+		b.Fatal(err)
+	}
+
+	defer func() {
+		if err := fixtures.Clean(); err != nil {
+			b.Fatal(err)
+		}
+	}()
+
+	for _, f := range fixtures.Basic() {
+		b.Run(f.URL, func(b *testing.B) {
+			fs := f.DotGit()
+			o, err := NewObjectStorage(dotgit.New(fs))
+			if err != nil {
+				b.Fatal(err)
+			}
+
+			for i := 0; i < b.N; i++ {
+				expected := plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5")
+				obj, err := o.EncodedObject(plumbing.AnyObject, expected)
+				if err != nil {
+					b.Fatal(err)
+				}
+
+				if obj.Hash() != expected {
+					b.Errorf("expecting %s, got %s", expected, obj.Hash())
+				}
+			}
+		})
+	}
+}