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// // Copyright 2010 The Go Authors. All rights reserved.
// // Use of this source code is governed by a BSD-style
// // license that can be found in the LICENSE file.
// package cipher
// import "io"
// // The Stream* objects are so simple that all their members are public. Users
// // can create them themselves.
// // StreamReader wraps a Stream into an io.Reader. It calls xor_key_stream
// // to process each slice of data which passes through.
// type StreamReader struct {
// S Stream
// R io.Reader
// }
// func (r StreamReader) Read(dst []byte) (n int, err error) {
// n, err = r.R.Read(dst)
// r.S.xor_key_stream(dst[..n], dst[..n])
// return
// }
// // StreamWriter wraps a Stream into an io.Writer. It calls xor_key_stream
// // 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
// Err error // unused
// }
// func (w StreamWriter) Write(src []byte) (n int, err error) {
// c := make([]byte, src.len())
// w.S.xor_key_stream(c, src)
// n, err = w.W.Write(c)
// if n != src.len() && err == nil { // should never happen
// err = io.ErrShortWrite
// }
// 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 {
// if c, ok := w.W.(io.Closer); ok {
// return c.Close()
// }
// return nil
// }