| // 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 SRC_DEVELOPER_DEBUG_IPC_MESSAGE_WRITER_H_ |
| #define SRC_DEVELOPER_DEBUG_IPC_MESSAGE_WRITER_H_ |
| |
| #include <stdint.h> |
| |
| #include <vector> |
| |
| #include "src/developer/debug/ipc/protocol.h" |
| |
| namespace debug_ipc { |
| |
| struct MsgHeader; |
| |
| // Provides a simple means to append to a dynamic buffer different types of |
| // data. |
| // |
| // The first 4 bytes of each message is the message size. It's assumed that |
| // these bytes will be explicitly written to. Normally a message will start |
| // with a struct which contains space for this explicitly. |
| class MessageWriter { |
| public: |
| MessageWriter(); |
| // The argument is a hint for the initial size of the message. |
| explicit MessageWriter(size_t initial_size); |
| ~MessageWriter(); |
| |
| void WriteBytes(const void* data, uint32_t len); |
| void WriteInt32(int32_t i); |
| void WriteUint32(uint32_t i); |
| void WriteInt64(int64_t i); |
| void WriteUint64(uint64_t i); |
| void WriteString(const std::string& str); |
| void WriteBool(bool b); |
| |
| void WriteHeader(MsgHeader::Type type, uint32_t transaction_id); |
| |
| size_t current_length() const { return buffer_.size(); } |
| |
| // Writes the size of the current buffer to the first 4 bytes, and |
| // destructively returns the buffer. |
| std::vector<char> MessageComplete(); |
| |
| private: |
| std::vector<char> buffer_; |
| }; |
| |
| } // namespace debug_ipc |
| |
| #endif // SRC_DEVELOPER_DEBUG_IPC_MESSAGE_WRITER_H_ |