fix chunk readerHEADmaster

1 files changed, 21 insertions, 1 deletions

diff --git a/ioaead.go b/ioaead.go
index 63b4a74..773f641 100644
--- a/ioaead.go
+++ b/ioaead.go
@@ -144,7 +144,27 @@ func (r *streamReader) readTo(b []byte) (int, error) {
 // in such a case, you need to unread data. a simple demonstration would be to delete
 // or truncate the file if ErrAuthMsg is returned
 func (r *streamReader) Read(b []byte) (int, error) {
-	return r.readTo(b)
+	if len(b) <= 16 {
+		return r.readTo(b)
+	}
+	n := 0
+	for {
+		if n+16 > len(b) {
+			sr, err := r.readTo(b[n:])
+			n += sr
+			if err != nil {
+				return n, err
+			}
+			break
+		}
+
+		sr, err := r.readTo(b[n : n+16])
+		n += sr
+		if err != nil {
+			return n, err
+		}
+	}
+	return n, nil
 }
 
 func (r *streamReader) verify() error {