Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 34 insertions, 0 deletions

diff --git a/pkg/secio/full_reader.go b/pkg/secio/full_reader.go
new file mode 100644
index 000000000..b2dbb8615
--- /dev/null
+++ b/pkg/secio/full_reader.go
@@ -0,0 +1,34 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package secio
+
+import (
+	"io"
+)
+
+// FullReader adapts an io.Reader to never return partial reads with a nil
+// error.
+type FullReader struct {
+	Reader io.Reader
+}
+
+// Read implements io.Reader.Read.
+func (r FullReader) Read(dst []byte) (int, error) {
+	n, err := io.ReadFull(r.Reader, dst)
+	if err == io.ErrUnexpectedEOF {
+		return n, io.EOF
+	}
+	return n, err
+}