io: correctly handle seek offset with io.SeekEnd

ipfs · Jan 29, 2019 · cdb64d5 · cdb64d5
1 parent 9dacd09
commit cdb64d5
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/io/dagreader.go b/io/dagreader.go
@@ -472,7 +472,7 @@ func (dr *dagReader) Seek(offset int64, whence int) (int64, error) {
 		// searches in the `Walker` (see `Walker.Seek`).
 
 	case io.SeekEnd:
-		return dr.Seek(int64(dr.Size())-offset, io.SeekStart)
+		return dr.Seek(int64(dr.Size())+offset, io.SeekStart)
 
 	default:
 		return 0, errors.New("invalid whence")

diff --git a/io/dagreader_test.go b/io/dagreader_test.go
@@ -107,7 +107,7 @@ func TestRelativeSeek(t *testing.T) {
 		}
 	}
 
-	_, err = reader.Seek(4, io.SeekEnd)
+	_, err = reader.Seek(-4, io.SeekEnd)
 	if err != nil {
 		t.Fatal(err)
 	}