| // Copyright 2018 The Fuchsia 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 LIB_FIDL_CPP_MESSAGE_BUFFER_H_ |
| #define LIB_FIDL_CPP_MESSAGE_BUFFER_H_ |
| |
| #include <lib/fidl/cpp/builder.h> |
| #include <lib/fidl/cpp/message.h> |
| #include <stdint.h> |
| #include <zircon/fidl.h> |
| #include <zircon/types.h> |
| |
| namespace fidl { |
| |
| class MessageBuffer { |
| public: |
| // Creates a |MessageBuffer| that allocates buffers for message of the |
| // given capacities. |
| // |
| // The buffers are freed when the |MessageBuffer| is destructed. |
| explicit MessageBuffer(uint32_t bytes_capacity = ZX_CHANNEL_MAX_MSG_BYTES, |
| uint32_t handles_capacity = ZX_CHANNEL_MAX_MSG_HANDLES); |
| |
| // The memory that backs the message is freed by this destructor. |
| ~MessageBuffer(); |
| |
| // The memory in which bytes can be stored in this buffer. |
| uint8_t* bytes() const { return buffer_; } |
| |
| // The total number of bytes that can be stored in this buffer. |
| uint32_t bytes_capacity() const { return bytes_capacity_; } |
| |
| // The memory in which handles can be stored in this buffer. |
| zx_handle_t* handles() const; |
| |
| // The total number of handles that can be stored in this buffer. |
| uint32_t handles_capacity() const { return handles_capacity_; } |
| |
| // Creates a |Message| that is backed by the memory in this buffer. |
| // |
| // The returned |Message| contains no bytes or handles. |
| Message CreateEmptyMessage(); |
| |
| // Creates a |Builder| that is backed by the memory in this buffer. |
| Builder CreateBuilder(); |
| |
| private: |
| uint8_t* const buffer_; |
| const uint32_t bytes_capacity_; |
| const uint32_t handles_capacity_; |
| }; |
| |
| } // namespace fidl |
| |
| #endif // LIB_FIDL_CPP_MESSAGE_BUFFER_H_ |