diff options
Diffstat (limited to 'libgo/go/crypto/cipher/io.go')
| -rw-r--r-- | libgo/go/crypto/cipher/io.go | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/libgo/go/crypto/cipher/io.go b/libgo/go/crypto/cipher/io.go index 807e8daeaf4..3938c0a4c88 100644 --- a/libgo/go/crypto/cipher/io.go +++ b/libgo/go/crypto/cipher/io.go @@ -25,6 +25,8 @@ func (r StreamReader) Read(dst []byte) (n int, err error) { // StreamWriter wraps a Stream into an io.Writer. It calls XORKeyStream // to process each slice of data which passes through. If any Write call // returns short then the StreamWriter is out of sync and must be discarded. +// A StreamWriter has no internal buffering; Close does not need +// to be called to flush write data. type StreamWriter struct { S Stream W io.Writer @@ -43,8 +45,11 @@ func (w StreamWriter) Write(src []byte) (n int, err error) { return } +// Close closes the underlying Writer and returns its Close return value, if the Writer +// is also an io.Closer. Otherwise it returns nil. func (w StreamWriter) Close() error { - // This saves us from either requiring a WriteCloser or having a - // StreamWriterCloser. - return w.W.(io.Closer).Close() + if c, ok := w.W.(io.Closer); ok { + return c.Close() + } + return nil } |