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- //
- // chat_message.hpp
- // ~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #ifndef CHAT_MESSAGE_HPP
- #define CHAT_MESSAGE_HPP
- #include <cstdio>
- #include <cstdlib>
- #include <cstring>
- class chat_message
- {
- public:
- enum { header_length = 4 };
- enum { max_body_length = 512 };
- chat_message()
- : body_length_(0)
- {
- }
- const char* data() const
- {
- return data_;
- }
- char* data()
- {
- return data_;
- }
- size_t length() const
- {
- return header_length + body_length_;
- }
- const char* body() const
- {
- return data_ + header_length;
- }
- char* body()
- {
- return data_ + header_length;
- }
- size_t body_length() const
- {
- return body_length_;
- }
- void body_length(size_t new_length)
- {
- body_length_ = new_length;
- if (body_length_ > max_body_length)
- body_length_ = max_body_length;
- }
- bool decode_header()
- {
- using namespace std; // For strncat and atoi.
- char header[header_length + 1] = "";
- strncat(header, data_, header_length);
- body_length_ = atoi(header);
- if (body_length_ > max_body_length)
- {
- body_length_ = 0;
- return false;
- }
- return true;
- }
- void encode_header()
- {
- using namespace std; // For sprintf and memcpy.
- char header[header_length + 1] = "";
- sprintf(header, "%4d", static_cast<int>(body_length_));
- memcpy(data_, header, header_length);
- }
- private:
- char data_[header_length + max_body_length];
- size_t body_length_;
- };
- #endif // CHAT_MESSAGE_HPP
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