Source/modules/websockets/WebSocketExtensionParser.cpp - Issue 639333003: Delete the old WebSocket implementation.

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Issue 639333003: Delete the old WebSocket implementation. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: Created 6 years, 2 months ago

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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 "modules/websockets/WebSocketExtensionParser.h"

34

35 #include "wtf/ASCIICType.h"

36 #include "wtf/text/CString.h"

37

38 namespace blink {

39

40 WebSocketExtensionParser::ParserStateBackup::~ParserStateBackup()

41 {

42 if (!m_isDisposed) {

43 m_parser->m_current = m_current;

44 }

45 }

46

47 bool WebSocketExtensionParser::finished()

48 {

49 return m_current >= m_end;

50 }

51

52 bool WebSocketExtensionParser::parsedSuccessfully()

53 {

54 return m_current == m_end;

55 }

56

57 static bool isSeparator(char character)

58 {

59 static const char* separatorCharacters = "()<>@,;:\\\"/[]?={} \t";

60 const char* p = strchr(separatorCharacters, character);

61 return p && *p;

62 }

63

64 void WebSocketExtensionParser::skipSpaces()

65 {

66 while (m_current < m_end && (m_current == ' ' \|\| m_current == '\t'))

67 ++m_current;

68 }

69

70 bool WebSocketExtensionParser::consumeToken()

71 {

72 ParserStateBackup backup(this);

73 skipSpaces();

74 const char* start = m_current;

75 while (m_current < m_end && isASCIIPrintable(m_current) && !isSeparator(m_ current))

76 ++m_current;

77 if (start < m_current) {

78 m_currentToken = String(start, m_current - start);

79 backup.dispose();

80 return true;

81 }

82 return false;

83 }

84

85 bool WebSocketExtensionParser::consumeQuotedString()

86 {

87 ParserStateBackup backup(this);

88 skipSpaces();

89 if (m_current >= m_end \|\| *m_current != '"')

90 return false;

91

92 Vector<char> buffer;

93 ++m_current;

94 while (m_current < m_end && *m_current != '"') {

95 if (*m_current == '\\' && ++m_current >= m_end)

96 return false;

97 // RFC6455 requires that the value after quoted-string unescaping

98 // MUST conform to the 'token' ABNF.

99 if (!isASCIIPrintable(m_current) \|\| isSeparator(m_current))

100 return false;

101 buffer.append(*m_current);

102 ++m_current;

103 }

104 if (m_current >= m_end \|\| *m_current != '"' \|\| buffer.isEmpty())

105 return false;

106 m_currentToken = String::fromUTF8(buffer.data(), buffer.size());

107 ++m_current;

108 backup.dispose();

109 return true;

110 }

111

112 bool WebSocketExtensionParser::consumeQuotedStringOrToken()

113 {

114 // This is ok because consumeQuotedString() restores m_current

115 // on failure.

116 return consumeQuotedString() \|\| consumeToken();

117 }

118

119 bool WebSocketExtensionParser::consumeCharacter(char character)

120 {

121 ParserStateBackup backup(this);

122 skipSpaces();

123 if (m_current < m_end && *m_current == character) {

124 ++m_current;

125 backup.dispose();

126 return true;

127 }

128 return false;

129 }

130

131 bool WebSocketExtensionParser::parseExtension(String& extensionToken, HashMap<St ring, String>& extensionParameters)

132 {

133 ParserStateBackup backup(this);

134 // Parse extension-token.

135 if (!consumeToken())

136 return false;

137

138 extensionToken = currentToken();

139

140 // Parse extension-parameters if exists.

141 while (consumeCharacter(';')) {

142 if (!consumeToken())

143 return false;

144

145 String parameterToken = currentToken();

146 if (consumeCharacter('=')) {

147 if (consumeQuotedStringOrToken())

148 extensionParameters.add(parameterToken, currentToken());

149 else

150 return false;

151 } else {

152 extensionParameters.add(parameterToken, String());

153 }

154 }

155 skipSpaces();

156 if (!finished() && !consumeCharacter(','))

157 return false;

158

159 backup.dispose();

160 return true;

161 }

162

163 } // namespace blink

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