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/* encoding.cpp
* Copyright (C) 2003-2005 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "tnt/encoding.h"
#include <cctype>
#include <cxxtools/log.h>
#include <stdexcept>
log_define("tntnet.encoding")
namespace tnt
{
void Encoding::parse(const std::string& header)
{
log_debug("encode header \"" << header << '"');
encodingMap.clear();
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;
for (std::string::const_iterator it = header.begin(); it != header.end(); ++it)
{
char ch = *it;
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 == ',')
{
log_debug("encoding=" << encoding);
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))
throw std::runtime_error("invalid encoding-string \"" + header + '"');
break;
case state_qualityeq:
if (ch == '=')
state = state_quality;
else if (!std::isspace(ch))
throw std::runtime_error("invalid encoding-string \"" + header + '"');
break;
case state_quality:
if (std::isdigit(ch))
{
quality = (ch - '0') * 10;
state = state_qualitypoint;
}
else
throw std::runtime_error("invalid encoding-string \"" + header + '"');
break;
case state_qualitypoint:
if (ch == '.')
state = state_qualitytenth;
else if (ch == ';')
{
log_debug("encoding=" << encoding << " quality " << quality);
encodingMap.insert(encodingMapType::value_type(encoding, quality));
state = state_0;
}
else
throw std::runtime_error("invalid encoding-string \"" + header + '"');
break;
case state_qualitytenth:
if (std::isdigit(ch))
{
quality += ch - '0';
log_debug("encoding=" << encoding << " quality " << quality);
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:
log_debug("encoding=" << encoding);
encodingMap.insert(encodingMapType::value_type(encoding, 1));
break;
case state_quality:
case state_qualitypoint:
case state_qualitytenth:
log_debug("encoding=" << encoding << " quality " << quality);
encodingMap.insert(encodingMapType::value_type(encoding, quality));
break;
default:
break;
}
}
unsigned Encoding::accept(const std::string& encoding) const
{
// check, if encoding is specified
log_debug("accept(\"" << encoding << "\")");
encodingMapType::const_iterator it = encodingMap.find(encoding);
if (it != encodingMap.end())
{
log_debug("accept(\"" << encoding << "\") => " << it->second);
return it->second;
}
// check, if a wildcard-rule is specified
it = encodingMap.find("*");
if (it != encodingMap.end())
{
log_debug("accept(\"" << encoding << "\") => " << it->second);
return it->second;
}
// return 10 (accept), if encoding is identity, 0 otherwise
log_debug("accept(\"" << encoding << "\") => " << (encoding == "identity" ? 10 : 0));
return encoding == "identity" ? 10 : 0;
}
}
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