757 lines
23 KiB
C++
757 lines
23 KiB
C++
//
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// read_until.ipp
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// ~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_READ_UNTIL_IPP
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#define ASIO_READ_UNTIL_IPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <algorithm>
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#include <limits>
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#include <string>
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#include <utility>
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#include "asio/detail/pop_options.hpp"
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#include "asio/buffer.hpp"
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/const_buffers_iterator.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/handler_invoke_helpers.hpp"
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#include "asio/detail/throw_error.hpp"
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namespace asio {
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template <typename SyncReadStream, typename Allocator>
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inline std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, char delim)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_until(s, b, delim, ec);
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asio::detail::throw_error(ec);
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return bytes_transferred;
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}
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template <typename SyncReadStream, typename Allocator>
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std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, char delim,
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asio::error_code& ec)
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{
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std::size_t next_search_start = 0;
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for (;;)
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{
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = b.data();
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iterator begin(buffers, next_search_start);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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iterator iter = std::find(begin, end, delim);
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if (iter != end)
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{
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// Found a match. We're done.
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ec = asio::error_code();
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return iter.position() + 1;
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}
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else
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{
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// No match. Next search can start with the new data.
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next_search_start = end.position();
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}
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// Check if buffer is full.
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if (b.size() == b.max_size())
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{
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ec = error::not_found;
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return 0;
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}
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// Need more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, b.max_size() - b.size());
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b.commit(s.read_some(b.prepare(bytes_available), ec));
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if (ec)
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return 0;
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}
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}
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template <typename SyncReadStream, typename Allocator>
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inline std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, const std::string& delim)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_until(s, b, delim, ec);
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asio::detail::throw_error(ec);
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return bytes_transferred;
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}
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namespace detail
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{
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// Algorithm that finds a subsequence of equal values in a sequence. Returns
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// (iterator,true) if a full match was found, in which case the iterator
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// points to the beginning of the match. Returns (iterator,false) if a
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// partial match was found at the end of the first sequence, in which case
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// the iterator points to the beginning of the partial match. Returns
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// (last1,false) if no full or partial match was found.
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template <typename Iterator1, typename Iterator2>
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std::pair<Iterator1, bool> partial_search(
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Iterator1 first1, Iterator1 last1, Iterator2 first2, Iterator2 last2)
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{
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for (Iterator1 iter1 = first1; iter1 != last1; ++iter1)
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{
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Iterator1 test_iter1 = iter1;
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Iterator2 test_iter2 = first2;
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for (;; ++test_iter1, ++test_iter2)
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{
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if (test_iter2 == last2)
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return std::make_pair(iter1, true);
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if (test_iter1 == last1)
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{
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if (test_iter2 != first2)
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return std::make_pair(iter1, false);
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else
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break;
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}
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if (*test_iter1 != *test_iter2)
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break;
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}
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}
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return std::make_pair(last1, false);
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}
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} // namespace detail
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template <typename SyncReadStream, typename Allocator>
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std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, const std::string& delim,
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asio::error_code& ec)
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{
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std::size_t next_search_start = 0;
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for (;;)
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{
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = b.data();
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iterator begin(buffers, next_search_start);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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std::pair<iterator, bool> result = asio::detail::partial_search(
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begin, end, delim.begin(), delim.end());
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if (result.first != end)
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{
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if (result.second)
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{
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// Full match. We're done.
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ec = asio::error_code();
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return result.first.position() + delim.length();
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}
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else
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{
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// Partial match. Next search needs to start from beginning of match.
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next_search_start = result.first.position();
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}
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}
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else
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{
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// No match. Next search can start with the new data.
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next_search_start = end.position();
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}
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// Check if buffer is full.
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if (b.size() == b.max_size())
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{
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ec = error::not_found;
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return 0;
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}
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// Need more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, b.max_size() - b.size());
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b.commit(s.read_some(b.prepare(bytes_available), ec));
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if (ec)
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return 0;
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}
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}
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template <typename SyncReadStream, typename Allocator>
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inline std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, const boost::regex& expr)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_until(s, b, expr, ec);
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asio::detail::throw_error(ec);
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return bytes_transferred;
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}
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template <typename SyncReadStream, typename Allocator>
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std::size_t read_until(SyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
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asio::error_code& ec)
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{
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std::size_t next_search_start = 0;
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for (;;)
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{
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = b.data();
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iterator begin(buffers, next_search_start);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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boost::match_results<iterator> match_results;
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if (boost::regex_search(begin, end, match_results, expr,
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boost::match_default | boost::match_partial))
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{
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if (match_results[0].matched)
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{
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// Full match. We're done.
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ec = asio::error_code();
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return match_results[0].second.position();
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}
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else
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{
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// Partial match. Next search needs to start from beginning of match.
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next_search_start = match_results[0].first.position();
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}
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}
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else
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{
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// No match. Next search can start with the new data.
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next_search_start = end.position();
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}
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// Check if buffer is full.
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if (b.size() == b.max_size())
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{
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ec = error::not_found;
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return 0;
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}
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// Need more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, b.max_size() - b.size());
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b.commit(s.read_some(b.prepare(bytes_available), ec));
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if (ec)
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return 0;
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}
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}
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namespace detail
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{
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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class read_until_delim_handler
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{
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public:
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read_until_delim_handler(AsyncReadStream& stream,
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asio::basic_streambuf<Allocator>& streambuf, char delim,
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std::size_t next_search_start, ReadHandler handler)
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: stream_(stream),
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streambuf_(streambuf),
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delim_(delim),
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next_search_start_(next_search_start),
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handler_(handler)
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{
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}
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void operator()(const asio::error_code& ec,
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std::size_t bytes_transferred)
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{
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// Check for errors.
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if (ec)
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{
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std::size_t bytes = 0;
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handler_(ec, bytes);
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return;
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}
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// Commit received data to streambuf's get area.
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streambuf_.commit(bytes_transferred);
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = streambuf_.data();
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iterator begin(buffers, next_search_start_);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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iterator iter = std::find(begin, end, delim_);
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if (iter != end)
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{
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// Found a match. We're done.
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std::size_t bytes = iter.position() + 1;
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handler_(ec, bytes);
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return;
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}
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// No match. Check if buffer is full.
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if (streambuf_.size() == streambuf_.max_size())
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{
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std::size_t bytes = 0;
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asio::error_code ec(error::not_found);
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handler_(ec, bytes);
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return;
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}
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// Next search can start with the new data.
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next_search_start_ = end.position();
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// Start a new asynchronous read operation to obtain more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
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stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
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}
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//private:
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AsyncReadStream& stream_;
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asio::basic_streambuf<Allocator>& streambuf_;
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char delim_;
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std::size_t next_search_start_;
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ReadHandler handler_;
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};
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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inline void* asio_handler_allocate(std::size_t size,
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read_until_delim_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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return asio_handler_alloc_helpers::allocate(
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size, &this_handler->handler_);
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}
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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inline void asio_handler_deallocate(void* pointer, std::size_t size,
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read_until_delim_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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asio_handler_alloc_helpers::deallocate(
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pointer, size, &this_handler->handler_);
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}
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template <typename Function, typename AsyncReadStream, typename Allocator,
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typename ReadHandler>
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inline void asio_handler_invoke(const Function& function,
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read_until_delim_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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asio_handler_invoke_helpers::invoke(
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function, &this_handler->handler_);
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}
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} // namespace detail
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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void async_read_until(AsyncReadStream& s,
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asio::basic_streambuf<Allocator>& b, char delim, ReadHandler handler)
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{
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = b.data();
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iterator begin(buffers, 0);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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iterator iter = std::find(begin, end, delim);
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if (iter != end)
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{
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// Found a match. We're done.
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asio::error_code ec;
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std::size_t bytes = iter.position() + 1;
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s.io_service().post(detail::bind_handler(handler, ec, bytes));
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return;
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}
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// No match. Check if buffer is full.
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if (b.size() == b.max_size())
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{
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asio::error_code ec(error::not_found);
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s.io_service().post(detail::bind_handler(handler, ec, 0));
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return;
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}
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// Start a new asynchronous read operation to obtain more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, b.max_size() - b.size());
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s.async_read_some(b.prepare(bytes_available),
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detail::read_until_delim_handler<AsyncReadStream, Allocator, ReadHandler>(
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s, b, delim, end.position(), handler));
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}
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namespace detail
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{
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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class read_until_delim_string_handler
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{
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public:
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read_until_delim_string_handler(AsyncReadStream& stream,
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asio::basic_streambuf<Allocator>& streambuf,
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const std::string& delim, std::size_t next_search_start,
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ReadHandler handler)
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: stream_(stream),
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streambuf_(streambuf),
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delim_(delim),
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next_search_start_(next_search_start),
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handler_(handler)
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{
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}
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void operator()(const asio::error_code& ec,
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std::size_t bytes_transferred)
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{
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// Check for errors.
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if (ec)
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{
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std::size_t bytes = 0;
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handler_(ec, bytes);
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return;
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}
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// Commit received data to streambuf's get area.
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streambuf_.commit(bytes_transferred);
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// Determine the range of the data to be searched.
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typedef typename asio::basic_streambuf<
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Allocator>::const_buffers_type const_buffers_type;
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typedef asio::detail::const_buffers_iterator<
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const_buffers_type> iterator;
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const_buffers_type buffers = streambuf_.data();
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iterator begin(buffers, next_search_start_);
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iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
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// Look for a match.
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std::pair<iterator, bool> result = asio::detail::partial_search(
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begin, end, delim_.begin(), delim_.end());
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if (result.first != end)
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{
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if (result.second)
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{
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// Full match. We're done.
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std::size_t bytes = result.first.position() + delim_.length();
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handler_(ec, bytes);
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return;
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}
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else
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{
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// Partial match. Next search needs to start from beginning of match.
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next_search_start_ = result.first.position();
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}
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}
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else
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{
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// No match. Next search can start with the new data.
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next_search_start_ = end.position();
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}
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// Check if buffer is full.
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if (streambuf_.size() == streambuf_.max_size())
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{
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std::size_t bytes = 0;
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asio::error_code ec(error::not_found);
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handler_(ec, bytes);
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return;
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}
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// Start a new asynchronous read operation to obtain more data.
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std::size_t bytes_available =
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std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
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stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
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}
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//private:
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AsyncReadStream& stream_;
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asio::basic_streambuf<Allocator>& streambuf_;
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std::string delim_;
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std::size_t next_search_start_;
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ReadHandler handler_;
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};
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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inline void* asio_handler_allocate(std::size_t size,
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read_until_delim_string_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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return asio_handler_alloc_helpers::allocate(
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size, &this_handler->handler_);
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}
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template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
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inline void asio_handler_deallocate(void* pointer, std::size_t size,
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read_until_delim_string_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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asio_handler_alloc_helpers::deallocate(
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pointer, size, &this_handler->handler_);
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}
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template <typename Function, typename AsyncReadStream,
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typename Allocator, typename ReadHandler>
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inline void asio_handler_invoke(const Function& function,
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read_until_delim_string_handler<AsyncReadStream,
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Allocator, ReadHandler>* this_handler)
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{
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asio_handler_invoke_helpers::invoke(
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function, &this_handler->handler_);
|
|
}
|
|
} // namespace detail
|
|
|
|
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
|
|
void async_read_until(AsyncReadStream& s,
|
|
asio::basic_streambuf<Allocator>& b, const std::string& delim,
|
|
ReadHandler handler)
|
|
{
|
|
// Determine the range of the data to be searched.
|
|
typedef typename asio::basic_streambuf<
|
|
Allocator>::const_buffers_type const_buffers_type;
|
|
typedef asio::detail::const_buffers_iterator<
|
|
const_buffers_type> iterator;
|
|
const_buffers_type buffers = b.data();
|
|
iterator begin(buffers, 0);
|
|
iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
|
|
|
|
// Look for a match.
|
|
std::size_t next_search_start;
|
|
std::pair<iterator, bool> result = asio::detail::partial_search(
|
|
begin, end, delim.begin(), delim.end());
|
|
if (result.first != end)
|
|
{
|
|
if (result.second)
|
|
{
|
|
// Full match. We're done.
|
|
asio::error_code ec;
|
|
std::size_t bytes = result.first.position() + delim.length();
|
|
s.io_service().post(detail::bind_handler(handler, ec, bytes));
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
// Partial match. Next search needs to start from beginning of match.
|
|
next_search_start = result.first.position();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// No match. Next search can start with the new data.
|
|
next_search_start = end.position();
|
|
}
|
|
|
|
// Check if buffer is full.
|
|
if (b.size() == b.max_size())
|
|
{
|
|
asio::error_code ec(error::not_found);
|
|
s.io_service().post(detail::bind_handler(handler, ec, 0));
|
|
return;
|
|
}
|
|
|
|
// Start a new asynchronous read operation to obtain more data.
|
|
std::size_t bytes_available =
|
|
std::min<std::size_t>(512, b.max_size() - b.size());
|
|
s.async_read_some(b.prepare(bytes_available),
|
|
detail::read_until_delim_string_handler<
|
|
AsyncReadStream, Allocator, ReadHandler>(
|
|
s, b, delim, next_search_start, handler));
|
|
}
|
|
|
|
namespace detail
|
|
{
|
|
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
|
|
class read_until_expr_handler
|
|
{
|
|
public:
|
|
read_until_expr_handler(AsyncReadStream& stream,
|
|
asio::basic_streambuf<Allocator>& streambuf,
|
|
const boost::regex& expr, std::size_t next_search_start,
|
|
ReadHandler handler)
|
|
: stream_(stream),
|
|
streambuf_(streambuf),
|
|
expr_(expr),
|
|
next_search_start_(next_search_start),
|
|
handler_(handler)
|
|
{
|
|
}
|
|
|
|
void operator()(const asio::error_code& ec,
|
|
std::size_t bytes_transferred)
|
|
{
|
|
// Check for errors.
|
|
if (ec)
|
|
{
|
|
std::size_t bytes = 0;
|
|
handler_(ec, bytes);
|
|
return;
|
|
}
|
|
|
|
// Commit received data to streambuf's get area.
|
|
streambuf_.commit(bytes_transferred);
|
|
|
|
// Determine the range of the data to be searched.
|
|
typedef typename asio::basic_streambuf<
|
|
Allocator>::const_buffers_type const_buffers_type;
|
|
typedef asio::detail::const_buffers_iterator<
|
|
const_buffers_type> iterator;
|
|
const_buffers_type buffers = streambuf_.data();
|
|
iterator begin(buffers, next_search_start_);
|
|
iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
|
|
|
|
// Look for a match.
|
|
boost::match_results<iterator> match_results;
|
|
if (boost::regex_search(begin, end, match_results, expr_,
|
|
boost::match_default | boost::match_partial))
|
|
{
|
|
if (match_results[0].matched)
|
|
{
|
|
// Full match. We're done.
|
|
std::size_t bytes = match_results[0].second.position();
|
|
handler_(ec, bytes);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
// Partial match. Next search needs to start from beginning of match.
|
|
next_search_start_ = match_results[0].first.position();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// No match. Next search can start with the new data.
|
|
next_search_start_ = end.position();
|
|
}
|
|
|
|
// Check if buffer is full.
|
|
if (streambuf_.size() == streambuf_.max_size())
|
|
{
|
|
std::size_t bytes = 0;
|
|
asio::error_code ec(error::not_found);
|
|
handler_(ec, bytes);
|
|
return;
|
|
}
|
|
|
|
// Start a new asynchronous read operation to obtain more data.
|
|
std::size_t bytes_available =
|
|
std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
|
|
stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
|
|
}
|
|
|
|
//private:
|
|
AsyncReadStream& stream_;
|
|
asio::basic_streambuf<Allocator>& streambuf_;
|
|
boost::regex expr_;
|
|
std::size_t next_search_start_;
|
|
ReadHandler handler_;
|
|
};
|
|
|
|
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
|
|
inline void* asio_handler_allocate(std::size_t size,
|
|
read_until_expr_handler<AsyncReadStream,
|
|
Allocator, ReadHandler>* this_handler)
|
|
{
|
|
return asio_handler_alloc_helpers::allocate(
|
|
size, &this_handler->handler_);
|
|
}
|
|
|
|
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
|
|
inline void asio_handler_deallocate(void* pointer, std::size_t size,
|
|
read_until_expr_handler<AsyncReadStream,
|
|
Allocator, ReadHandler>* this_handler)
|
|
{
|
|
asio_handler_alloc_helpers::deallocate(
|
|
pointer, size, &this_handler->handler_);
|
|
}
|
|
|
|
template <typename Function, typename AsyncReadStream, typename Allocator,
|
|
typename ReadHandler>
|
|
inline void asio_handler_invoke(const Function& function,
|
|
read_until_expr_handler<AsyncReadStream,
|
|
Allocator, ReadHandler>* this_handler)
|
|
{
|
|
asio_handler_invoke_helpers::invoke(
|
|
function, &this_handler->handler_);
|
|
}
|
|
} // namespace detail
|
|
|
|
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
|
|
void async_read_until(AsyncReadStream& s,
|
|
asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
|
|
ReadHandler handler)
|
|
{
|
|
// Determine the range of the data to be searched.
|
|
typedef typename asio::basic_streambuf<
|
|
Allocator>::const_buffers_type const_buffers_type;
|
|
typedef asio::detail::const_buffers_iterator<
|
|
const_buffers_type> iterator;
|
|
const_buffers_type buffers = b.data();
|
|
iterator begin(buffers, 0);
|
|
iterator end(buffers, (std::numeric_limits<std::size_t>::max)());
|
|
|
|
// Look for a match.
|
|
std::size_t next_search_start;
|
|
boost::match_results<iterator> match_results;
|
|
if (boost::regex_search(begin, end, match_results, expr,
|
|
boost::match_default | boost::match_partial))
|
|
{
|
|
if (match_results[0].matched)
|
|
{
|
|
// Full match. We're done.
|
|
asio::error_code ec;
|
|
std::size_t bytes = match_results[0].second.position();
|
|
s.io_service().post(detail::bind_handler(handler, ec, bytes));
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
// Partial match. Next search needs to start from beginning of match.
|
|
next_search_start = match_results[0].first.position();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// No match. Next search can start with the new data.
|
|
next_search_start = end.position();
|
|
}
|
|
|
|
// Check if buffer is full.
|
|
if (b.size() == b.max_size())
|
|
{
|
|
asio::error_code ec(error::not_found);
|
|
s.io_service().post(detail::bind_handler(handler, ec, 0));
|
|
return;
|
|
}
|
|
|
|
// Start a new asynchronous read operation to obtain more data.
|
|
std::size_t bytes_available =
|
|
std::min<std::size_t>(512, b.max_size() - b.size());
|
|
s.async_read_some(b.prepare(bytes_available),
|
|
detail::read_until_expr_handler<AsyncReadStream, Allocator, ReadHandler>(
|
|
s, b, expr, next_search_start, handler));
|
|
}
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_READ_UNTIL_IPP
|