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/*
* Copyright (C) 2003-2005 Tommi Maekitalo
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "tnt/encoding.h"
#include "tnt/util.h"
#include <cctype>
namespace tnt
{
namespace
{
void throwInvalidHeader(const char* header)
{
throwRuntimeError(std::string("invalid encoding-string \"") + header + '"');
}
}
void Encoding::parse(const char* header)
{
encodingMap.clear();
if (header == 0)
return;
enum {
state_0,
state_encoding,
state_quality,
state_qualityq,
state_qualityeq,
state_qualitypoint,
state_qualitytenth,
state_qualityign
} state = state_0;
std::string encoding;
unsigned quality = 0;
for (const char* p = header; *p; ++p)
{
char ch = *p;
switch (state)
{
case state_0:
if (!std::isspace(ch))
{
encoding.clear();
encoding.reserve(16);
encoding += ch;
state = state_encoding;
}
break;
case state_encoding:
if (ch == ';')
state = state_qualityq;
else if (ch == ',')
{
encodingMap.insert(encodingMapType::value_type(encoding, 1));
state = state_0;
}
else
encoding += ch;
break;
case state_qualityq:
if (ch == 'q')
state = state_qualityeq;
else if (!std::isspace(ch))
throwInvalidHeader(header);
break;
case state_qualityeq:
if (ch == '=')
state = state_quality;
else if (!std::isspace(ch))
throwInvalidHeader(header);
break;
case state_quality:
if (std::isdigit(ch))
{
quality = (ch - '0') * 10;
state = state_qualitypoint;
}
else
throwInvalidHeader(header);
break;
case state_qualitypoint:
if (ch == '.')
state = state_qualitytenth;
else if (ch == ';')
{
encodingMap.insert(encodingMapType::value_type(encoding, quality));
state = state_0;
}
else
throwInvalidHeader(header);
break;
case state_qualitytenth:
if (std::isdigit(ch))
{
quality += ch - '0';
encodingMap.insert(encodingMapType::value_type(encoding, quality));
state = state_qualityign;
}
else if (ch == ';')
state = state_0;
break;
case state_qualityign:
if (ch == ';')
state = state_0;
break;
}
}
switch (state)
{
case state_encoding:
encodingMap.insert(encodingMapType::value_type(encoding, 1));
break;
case state_quality:
case state_qualitypoint:
case state_qualitytenth:
encodingMap.insert(encodingMapType::value_type(encoding, quality));
break;
default:
break;
}
}
unsigned Encoding::accept(const std::string& encoding) const
{
// check, if encoding is specified
encodingMapType::const_iterator it = encodingMap.find(encoding);
if (it != encodingMap.end())
return it->second;
// check, if a wildcard-rule is specified
it = encodingMap.find("*");
if (it != encodingMap.end())
return it->second;
// return 10 (accept), if encoding is identity, 0 otherwise
return encoding == "identity" ? 10 : 0;
}
}
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