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// 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_