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-rw-r--r--xpcom/io/nsIInputStreamTee.idl42
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsIInputStream.idl"
+
+interface nsIOutputStream;
+interface nsIEventTarget;
+
+/**
+ * A nsIInputStreamTee is a wrapper for an input stream, that when read
+ * reads the specified amount of data from its |source| and copies that
+ * data to its |sink|. |sink| must be a blocking output stream.
+ */
+[scriptable, builtinclass, uuid(90a9d790-3bca-421e-a73b-98f68e13c917)]
+interface nsIInputStreamTee : nsIInputStream
+{
+ attribute nsIInputStream source;
+ attribute nsIOutputStream sink;
+
+ /**
+ * If |eventTarget| is set, copying to sink is done asynchronously using
+ * the event-target (e.g. a thread). If |eventTarget| is not set, copying
+ * to sink happens synchronously while reading from the source.
+ */
+ attribute nsIEventTarget eventTarget;
+};
+
+%{C++
+// factory methods
+extern nsresult
+NS_NewInputStreamTee(nsIInputStream **tee, // read from this input stream
+ nsIInputStream *source,
+ nsIOutputStream *sink);
+
+extern nsresult
+NS_NewInputStreamTeeAsync(nsIInputStream **tee, // read from this input stream
+ nsIInputStream *source,
+ nsIOutputStream *sink,
+ nsIEventTarget *eventTarget);
+%}