1 files changed, 28 insertions, 0 deletions
diff --git a/mailnews/base/util/nsMsgCompressOStream.h b/mailnews/base/util/nsMsgCompressOStream.h
new file mode 100644
index 000000000..c706a9617
--- /dev/null
+++ b/mailnews/base/util/nsMsgCompressOStream.h
@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"
+#include "nsIOutputStream.h"
+#include "nsCOMPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "zlib.h"
+
+class NS_MSG_BASE nsMsgCompressOStream final : public nsIOutputStream
+{
+public:
+  nsMsgCompressOStream();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  NS_DECL_NSIOUTPUTSTREAM
+
+  nsresult InitOutputStream(nsIOutputStream *rawStream);
+
+protected:
+  ~nsMsgCompressOStream();
+  nsCOMPtr<nsIOutputStream> m_oStream;
+  mozilla::UniquePtr<char[]> m_zbuf;
+  z_stream m_zstream;
+};
+