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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_SOCKETS)
#include "WebSocketExtensionParser.h"
#include <wtf/ASCIICType.h>
#include <wtf/text/CString.h>
namespace WebCore {
bool WebSocketExtensionParser::finished()
{
return m_current >= m_end;
}
bool WebSocketExtensionParser::parsedSuccessfully()
{
return m_current == m_end;
}
static bool isSeparator(char character)
{
static const char* separatorCharacters = "()<>@,;:\\\"/[]?={} \t";
const char* p = strchr(separatorCharacters, character);
return p && *p;
}
void WebSocketExtensionParser::skipSpaces()
{
while (m_current < m_end && (*m_current == ' ' || *m_current == '\t'))
++m_current;
}
bool WebSocketExtensionParser::consumeToken()
{
skipSpaces();
const char* start = m_current;
while (m_current < m_end && isASCIIPrintable(*m_current) && !isSeparator(*m_current))
++m_current;
if (start < m_current) {
m_currentToken = String(start, m_current - start);
return true;
}
return false;
}
bool WebSocketExtensionParser::consumeQuotedString()
{
skipSpaces();
if (m_current >= m_end || *m_current != '"')
return false;
Vector<char> buffer;
++m_current;
while (m_current < m_end && *m_current != '"') {
if (*m_current == '\\' && ++m_current >= m_end)
return false;
buffer.append(*m_current);
++m_current;
}
if (m_current >= m_end || *m_current != '"')
return false;
m_currentToken = String::fromUTF8(buffer.data(), buffer.size());
if (m_currentToken.isNull())
return false;
++m_current;
return true;
}
bool WebSocketExtensionParser::consumeQuotedStringOrToken()
{
// This is ok because consumeQuotedString() doesn't update m_current or
// makes it same as m_end on failure.
return consumeQuotedString() || consumeToken();
}
bool WebSocketExtensionParser::consumeCharacter(char character)
{
skipSpaces();
if (m_current < m_end && *m_current == character) {
++m_current;
return true;
}
return false;
}
bool WebSocketExtensionParser::parseExtension(String& extensionToken, HashMap<String, String>& extensionParameters)
{
// Parse extension-token.
if (!consumeToken())
return false;
extensionToken = currentToken();
// Parse extension-parameters if exists.
while (consumeCharacter(';')) {
if (!consumeToken())
return false;
String parameterToken = currentToken();
if (consumeCharacter('=')) {
if (consumeQuotedStringOrToken())
extensionParameters.add(parameterToken, currentToken());
else
return false;
} else
extensionParameters.add(parameterToken, String());
}
if (!finished() && !consumeCharacter(','))
return false;
return true;
}
} // namespace WebCore
#endif // ENABLE(WEB_SOCKETS)
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