1 // Copyright 2017 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_ 6 #define QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_ 7 8 #include <cstdint> 9 10 #include "quiche/common/platform/api/quiche_export.h" 11 12 namespace spdy { 13 14 class QUICHE_EXPORT ZeroCopyOutputBuffer { 15 public: ~ZeroCopyOutputBuffer()16 virtual ~ZeroCopyOutputBuffer() {} 17 18 // Returns the next available segment of memory to write. Will always return 19 // the same segment until AdvanceWritePtr is called. 20 virtual void Next(char** data, int* size) = 0; 21 22 // After writing to a buffer returned from Next(), the caller should call 23 // this method to indicate how many bytes were written. 24 virtual void AdvanceWritePtr(int64_t count) = 0; 25 26 // Returns the available capacity of the buffer. 27 virtual uint64_t BytesFree() const = 0; 28 }; 29 30 } // namespace spdy 31 32 #endif // QUICHE_SPDY_CORE_ZERO_COPY_OUTPUT_BUFFER_H_ 33