1/*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32
33#include "WebSocketExtensionParser.h"
34
35#include <wtf/ASCIICType.h>
36#include <wtf/text/CString.h>
37
38namespace WebCore {
39
40bool WebSocketExtensionParser::finished()
41{
42 return m_current >= m_end;
43}
44
45bool WebSocketExtensionParser::parsedSuccessfully()
46{
47 return m_current == m_end;
48}
49
50static bool isSeparator(char character)
51{
52 static const char* separatorCharacters = "()<>@,;:\\\"/[]?={} \t";
53 const char* p = strchr(separatorCharacters, character);
54 return p && *p;
55}
56
57void WebSocketExtensionParser::skipSpaces()
58{
59 while (m_current < m_end && (*m_current == ' ' || *m_current == '\t'))
60 ++m_current;
61}
62
63bool WebSocketExtensionParser::consumeToken()
64{
65 skipSpaces();
66 const char* start = m_current;
67 while (m_current < m_end && isASCIIPrintable(*m_current) && !isSeparator(*m_current))
68 ++m_current;
69 if (start < m_current) {
70 m_currentToken = String(start, m_current - start);
71 return true;
72 }
73 return false;
74}
75
76bool WebSocketExtensionParser::consumeQuotedString()
77{
78 skipSpaces();
79 if (m_current >= m_end || *m_current != '"')
80 return false;
81
82 Vector<char> buffer;
83 ++m_current;
84 while (m_current < m_end && *m_current != '"') {
85 if (*m_current == '\\' && ++m_current >= m_end)
86 return false;
87 buffer.append(*m_current);
88 ++m_current;
89 }
90 if (m_current >= m_end || *m_current != '"')
91 return false;
92 m_currentToken = String::fromUTF8(buffer.data(), buffer.size());
93 if (m_currentToken.isNull())
94 return false;
95 ++m_current;
96 return true;
97}
98
99bool WebSocketExtensionParser::consumeQuotedStringOrToken()
100{
101 // This is ok because consumeQuotedString() doesn't update m_current or
102 // makes it same as m_end on failure.
103 return consumeQuotedString() || consumeToken();
104}
105
106bool WebSocketExtensionParser::consumeCharacter(char character)
107{
108 skipSpaces();
109 if (m_current < m_end && *m_current == character) {
110 ++m_current;
111 return true;
112 }
113 return false;
114}
115
116bool WebSocketExtensionParser::parseExtension(String& extensionToken, HashMap<String, String>& extensionParameters)
117{
118 // Parse extension-token.
119 if (!consumeToken())
120 return false;
121
122 extensionToken = currentToken();
123
124 // Parse extension-parameters if exists.
125 while (consumeCharacter(';')) {
126 if (!consumeToken())
127 return false;
128
129 String parameterToken = currentToken();
130 if (consumeCharacter('=')) {
131 if (consumeQuotedStringOrToken())
132 extensionParameters.add(parameterToken, currentToken());
133 else
134 return false;
135 } else
136 extensionParameters.add(parameterToken, String());
137 }
138 if (!finished() && !consumeCharacter(','))
139 return false;
140
141 return true;
142}
143
144} // namespace WebCore
145