Project import generated by Copybara.
PiperOrigin-RevId: 229942388
Change-Id: Ib5a23c152c95ed4294cece9f902227c21ce531ef
diff --git a/spdy/core/zero_copy_output_buffer.h b/spdy/core/zero_copy_output_buffer.h
new file mode 100644
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--- /dev/null
+++ b/spdy/core/zero_copy_output_buffer.h
@@ -0,0 +1,30 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_
+#define QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_
+
+#include <cstdint>
+
+namespace spdy {
+
+class ZeroCopyOutputBuffer {
+ public:
+ virtual ~ZeroCopyOutputBuffer() {}
+
+ // Returns the next available segment of memory to write. Will always return
+ // the same segment until AdvanceWritePtr is called.
+ virtual void Next(char** data, int* size) = 0;
+
+ // After writing to a buffer returned from Next(), the caller should call
+ // this method to indicate how many bytes were written.
+ virtual void AdvanceWritePtr(int64_t count) = 0;
+
+ // Returns the available capacity of the buffer.
+ virtual uint64_t BytesFree() const = 0;
+};
+
+} // namespace spdy
+
+#endif // QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_
