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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/Function.h>
28#include <AK/String.h>
29#include <AK/Types.h>
30
31#include "Parser.h"
32
33void Parser::write(const StringView& data)
34{
35 for (size_t i = 0; i < data.length(); i++) {
36 u8 ch = data[i];
37
38 switch (m_state) {
39 case State::Free:
40 switch (ch) {
41 case IAC:
42 m_state = State::ReadCommand;
43 break;
44 case '\r':
45 if (on_data)
46 on_data("\n");
47 break;
48 default:
49 if (on_data)
50 on_data(StringView(&ch, 1));
51 break;
52 }
53 break;
54 case State::ReadCommand:
55 switch (ch) {
56 case IAC: {
57 m_state = State::Free;
58 if (on_data)
59 on_data("\xff");
60 break;
61 }
62 case CMD_WILL:
63 case CMD_WONT:
64 case CMD_DO:
65 case CMD_DONT:
66 m_command = ch;
67 m_state = State::ReadSubcommand;
68 break;
69 default:
70 m_state = State::Error;
71 if (on_error)
72 on_error();
73 break;
74 }
75 break;
76 case State::ReadSubcommand: {
77 auto command = m_command;
78 m_command = 0;
79 m_state = State::Free;
80 if (on_command)
81 on_command({ command, ch });
82 break;
83 }
84 case State::Error:
85 // ignore everything
86 break;
87 }
88 }
89}