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/*
* Copyright 2018 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_MEMORY_STREAM_H_
#define RTC_BASE_MEMORY_STREAM_H_
#include <stddef.h>
#include <cstdint>
#include "api/array_view.h"
#include "rtc_base/stream.h"
namespace webrtc {
// MemoryStream dynamically resizes to accomodate written data.
class MemoryStream final : public StreamInterface {
public:
MemoryStream();
~MemoryStream() override;
StreamState GetState() const override;
StreamResult Read(ArrayView<uint8_t> buffer,
size_t& bytes_read,
int& error) override;
StreamResult Write(ArrayView<const uint8_t> buffer,
size_t& bytes_written,
int& error) override;
void Close() override;
bool GetSize(size_t* size) const;
bool ReserveSize(size_t size);
bool SetPosition(size_t position);
bool GetPosition(size_t* position) const;
void Rewind();
char* GetBuffer() { return buffer_; }
const char* GetBuffer() const { return buffer_; }
void SetData(const void* data, size_t length);
private:
StreamResult DoReserve(size_t size, int* error);
// Invariant: 0 <= seek_position <= data_length_ <= buffer_length_
char* buffer_ = nullptr;
size_t buffer_length_ = 0;
size_t data_length_ = 0;
size_t seek_position_ = 0;
};
} // namespace webrtc
#endif // RTC_BASE_MEMORY_STREAM_H_
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