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120 lines
2.6 KiB
C++
120 lines
2.6 KiB
C++
/*
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* Copyright (c) 2008 Andrew Garrett.
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* Copyright (c) 2008 River Tarnell <river@wikimedia.org>
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* Derived from public domain code contributed by Victor Vasiliev.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely. This software is provided 'as-is', without any express or
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* implied warranty.
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*/
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#include <string>
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#include <istream>
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#include <boost/optional.hpp>
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#include "request.h"
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#include "fray.h"
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namespace afp {
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/* Perhaps, these should be configurable */
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static const int MAX_FILTER_LEN = 1024 * 10; /* 10 KB */
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static const int MAX_VARNAME_LEN = 255;
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static const int MAX_VALUE_LEN = 1024 * 256; /* 256 KB */
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// Protocol:
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// code NULL <key> NULL <value> NULL ... <value> NULL NULL
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template<typename charT, typename Traits>
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struct basic_nul_terminated_string_reader {
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typedef std::istream_iterator<charT> iterator_t;
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typedef std::basic_istream<charT, Traits> stream_t;
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typedef basic_fray<charT, Traits> string_t;
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basic_nul_terminated_string_reader(stream_t &stream)
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: stream_(stream)
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, it_(stream)
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, first_(true)
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{
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}
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boost::optional<string_t> read(std::size_t max_len = 0) {
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std::vector<char, boost::pool_allocator<char> > ret;
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ret.reserve(1024); /* probably enough for most inputs */
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if (first_)
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first_ = false;
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else
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++it_;
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for (; it_ != end_; ++it_) {
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if (*it_ == stream_.widen('\0')) {
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return basic_fray<charT>(&ret[0], ret.size());
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}
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if (max_len && (ret.size() > max_len))
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return boost::optional<string_t>();
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ret.push_back(*it_);
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}
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return boost::optional<string_t>();
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}
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private:
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stream_t &stream_;
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iterator_t it_, end_;
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bool first_;
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};
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typedef basic_nul_terminated_string_reader<char, std::char_traits<char> >
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nul_terminated_string_reader;
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bool
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request::load(std::istream &inp) {
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f.clear_variables();
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inp.unsetf(std::ios_base::skipws);
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nul_terminated_string_reader reader(inp);
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boost::optional<fray> str;
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if (!(str = reader.read(MAX_FILTER_LEN)))
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return false;
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filter = make_u32fray(*str);
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for (;;) {
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fray key, value;
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/* read the key */
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if (!(str = reader.read(MAX_VARNAME_LEN)))
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return false;
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key = *str;
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if (key.empty())
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/* empty string means end of input */
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return true;
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/* read the value */
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if (!(str = reader.read(MAX_VALUE_LEN)))
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return false;
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value = *str;
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f.add_variable( make_u32fray(key),
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u32datum::from_string_convert(
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make_u32fray(value)));
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}
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return true;
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}
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bool
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request::evaluate()
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{
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return f.evaluate(filter);
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}
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} // namespace afp
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