3 files changed, 28 insertions, 12 deletions
diff --git a/plumbing/format/gitignore/dir.go b/plumbing/format/gitignore/dir.go
index aca5d0d..92df5a3 100644
--- a/plumbing/format/gitignore/dir.go
+++ b/plumbing/format/gitignore/dir.go
@@ -64,6 +64,10 @@ func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error)
 
 	for _, fi := range fis {
 		if fi.IsDir() && fi.Name() != gitDir {
+			if NewMatcher(ps).Match(append(path, fi.Name()), true) {
+				continue
+			}
+
 			var subps []Pattern
 			subps, err = ReadPatterns(fs, append(path, fi.Name()))
 			if err != nil {
diff --git a/plumbing/format/gitignore/dir_test.go b/plumbing/format/gitignore/dir_test.go
index 465c571..ba8ad80 100644
--- a/plumbing/format/gitignore/dir_test.go
+++ b/plumbing/format/gitignore/dir_test.go
@@ -44,6 +44,8 @@ func (s *MatcherSuite) SetUpTest(c *C) {
 	c.Assert(err, IsNil)
 	_, err = f.Write([]byte("ignore.crlf\r\n"))
 	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("ignore_dir\n"))
+	c.Assert(err, IsNil)
 	err = f.Close()
 	c.Assert(err, IsNil)
 
@@ -56,6 +58,17 @@ func (s *MatcherSuite) SetUpTest(c *C) {
 	err = f.Close()
 	c.Assert(err, IsNil)
 
+	err = fs.MkdirAll("ignore_dir", os.ModePerm)
+	c.Assert(err, IsNil)
+	f, err = fs.Create("ignore_dir/.gitignore")
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("!file\n"))
+	c.Assert(err, IsNil)
+	_, err = fs.Create("ignore_dir/file")
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
 	err = fs.MkdirAll("another", os.ModePerm)
 	c.Assert(err, IsNil)
 	err = fs.MkdirAll("exclude.crlf", os.ModePerm)
@@ -267,12 +280,13 @@ func (s *MatcherSuite) SetUpTest(c *C) {
 
 func (s *MatcherSuite) TestDir_ReadPatterns(c *C) {
 	checkPatterns := func(ps []Pattern) {
-		c.Assert(ps, HasLen, 6)
+		c.Assert(ps, HasLen, 7)
 		m := NewMatcher(ps)
 
 		c.Assert(m.Match([]string{"exclude.crlf"}, true), Equals, true)
 		c.Assert(m.Match([]string{"ignore.crlf"}, true), Equals, true)
 		c.Assert(m.Match([]string{"vendor", "gopkg.in"}, true), Equals, true)
+		c.Assert(m.Match([]string{"ignore_dir", "file"}, false), Equals, true)
 		c.Assert(m.Match([]string{"vendor", "github.com"}, true), Equals, false)
 		c.Assert(m.Match([]string{"multiple", "sub", "ignores", "first", "ignore_dir"}, true), Equals, true)
 		c.Assert(m.Match([]string{"multiple", "sub", "ignores", "second", "ignore_dir"}, true), Equals, true)
diff --git a/plumbing/format/packfile/delta_index.go b/plumbing/format/packfile/delta_index.go
index 07a6112..a60ec0b 100644
--- a/plumbing/format/packfile/delta_index.go
+++ b/plumbing/format/packfile/delta_index.go
@@ -32,19 +32,17 @@ func (idx *deltaIndex) findMatch(src, tgt []byte, tgtOffset int) (srcOffset, l i
 		return 0, -1
 	}
 
-	if len(tgt) >= tgtOffset+s && len(src) >= blksz {
-		h := hashBlock(tgt, tgtOffset)
-		tIdx := h & idx.mask
-		eIdx := idx.table[tIdx]
-		if eIdx != 0 {
-			srcOffset = idx.entries[eIdx]
-		} else {
-			return
-		}
-
-		l = matchLength(src, tgt, tgtOffset, srcOffset)
+	h := hashBlock(tgt, tgtOffset)
+	tIdx := h & idx.mask
+	eIdx := idx.table[tIdx]
+	if eIdx == 0 {
+		return
 	}
 
+	srcOffset = idx.entries[eIdx]
+
+	l = matchLength(src, tgt, tgtOffset, srcOffset)
+
 	return
 }