]>
Commit | Line | Data |
---|---|---|
1 | // | |
2 | // chat_message.hpp | |
3 | // ~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef CHAT_MESSAGE_HPP | |
12 | #define CHAT_MESSAGE_HPP | |
13 | ||
14 | #include <cstdio> | |
15 | #include <cstdlib> | |
16 | #include <cstring> | |
17 | ||
18 | class chat_message | |
19 | { | |
20 | public: | |
21 | enum { header_length = 4 }; | |
22 | enum { max_body_length = 512 }; | |
23 | ||
24 | chat_message() | |
25 | : body_length_(0) | |
26 | { | |
27 | } | |
28 | ||
29 | const char* data() const | |
30 | { | |
31 | return data_; | |
32 | } | |
33 | ||
34 | char* data() | |
35 | { | |
36 | return data_; | |
37 | } | |
38 | ||
39 | std::size_t length() const | |
40 | { | |
41 | return header_length + body_length_; | |
42 | } | |
43 | ||
44 | const char* body() const | |
45 | { | |
46 | return data_ + header_length; | |
47 | } | |
48 | ||
49 | char* body() | |
50 | { | |
51 | return data_ + header_length; | |
52 | } | |
53 | ||
54 | std::size_t body_length() const | |
55 | { | |
56 | return body_length_; | |
57 | } | |
58 | ||
59 | void body_length(std::size_t new_length) | |
60 | { | |
61 | body_length_ = new_length; | |
62 | if (body_length_ > max_body_length) | |
63 | body_length_ = max_body_length; | |
64 | } | |
65 | ||
66 | bool decode_header() | |
67 | { | |
68 | char header[header_length + 1] = ""; | |
69 | std::strncat(header, data_, header_length); | |
70 | body_length_ = std::atoi(header); | |
71 | if (body_length_ > max_body_length) | |
72 | { | |
73 | body_length_ = 0; | |
74 | return false; | |
75 | } | |
76 | return true; | |
77 | } | |
78 | ||
79 | void encode_header() | |
80 | { | |
81 | char header[header_length + 1] = ""; | |
82 | std::sprintf(header, "%4d", static_cast<int>(body_length_)); | |
83 | std::memcpy(data_, header, header_length); | |
84 | } | |
85 | ||
86 | private: | |
87 | char data_[header_length + max_body_length]; | |
88 | std::size_t body_length_; | |
89 | }; | |
90 | ||
91 | #endif // CHAT_MESSAGE_HPP |