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// Copyright 2016 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 MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_
#define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_
#include <stddef.h>
#include <stdint.h>
#include <utility>
#include "base/macros.h"
#include "mojo/public/cpp/bindings/lib/buffer.h"
#include "mojo/public/cpp/system/message.h"
namespace mojo {
namespace internal {
// A fixed-size Buffer implementation using a Mojo message object for storage.
class MessageBuffer : public Buffer {
public:
// Initializes this buffer to carry a fixed byte capacity and no handles.
MessageBuffer(size_t capacity, bool zero_initialized);
// Initializes this buffer from an existing Mojo MessageHandle.
MessageBuffer(ScopedMessageHandle message, uint32_t num_bytes);
~MessageBuffer() override;
void* data() const { return buffer_; }
uint32_t data_num_bytes() const { return data_num_bytes_; }
// Buffer:
void* Allocate(size_t delta) override;
ScopedMessageHandle TakeMessage() { return std::move(message_); }
void NotifyBadMessage(const std::string& error);
private:
uint32_t data_num_bytes_ = 0;
ScopedMessageHandle message_;
void* buffer_;
uint32_t bytes_claimed_ = 0;
DISALLOW_COPY_AND_ASSIGN(MessageBuffer);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_
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