boost/asio/impl/read_until.hpp
// // impl/read_until.hpp // ~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_ASIO_IMPL_READ_UNTIL_HPP #define BOOST_ASIO_IMPL_READ_UNTIL_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <algorithm> #include <string> #include <vector> #include <utility> #include <boost/asio/buffer.hpp> #include <boost/asio/buffers_iterator.hpp> #include <boost/asio/detail/bind_handler.hpp> #include <boost/asio/detail/handler_alloc_helpers.hpp> #include <boost/asio/detail/handler_cont_helpers.hpp> #include <boost/asio/detail/handler_invoke_helpers.hpp> #include <boost/asio/detail/handler_type_requirements.hpp> #include <boost/asio/detail/limits.hpp> #include <boost/asio/detail/throw_error.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { template <typename SyncReadStream, typename Allocator> inline std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, char delim) { boost::system::error_code ec; std::size_t bytes_transferred = read_until(s, b, delim, ec); boost::asio::detail::throw_error(ec, "read_until"); return bytes_transferred; } template <typename SyncReadStream, typename Allocator> std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, char delim, boost::system::error_code& ec) { std::size_t search_position = 0; for (;;) { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = b.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position; iterator end = iterator::end(buffers); // Look for a match. iterator iter = std::find(start_pos, end, delim); if (iter != end) { // Found a match. We're done. ec = boost::system::error_code(); return iter - begin + 1; } else { // No match. Next search can start with the new data. search_position = end - begin; } // Check if buffer is full. if (b.size() == b.max_size()) { ec = error::not_found; return 0; } // Need more data. std::size_t bytes_to_read = read_size_helper(b, 65536); b.commit(s.read_some(b.prepare(bytes_to_read), ec)); if (ec) return 0; } } template <typename SyncReadStream, typename Allocator> inline std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const std::string& delim) { boost::system::error_code ec; std::size_t bytes_transferred = read_until(s, b, delim, ec); boost::asio::detail::throw_error(ec, "read_until"); return bytes_transferred; } namespace detail { // Algorithm that finds a subsequence of equal values in a sequence. Returns // (iterator,true) if a full match was found, in which case the iterator // points to the beginning of the match. Returns (iterator,false) if a // partial match was found at the end of the first sequence, in which case // the iterator points to the beginning of the partial match. Returns // (last1,false) if no full or partial match was found. template <typename Iterator1, typename Iterator2> std::pair<Iterator1, bool> partial_search( Iterator1 first1, Iterator1 last1, Iterator2 first2, Iterator2 last2) { for (Iterator1 iter1 = first1; iter1 != last1; ++iter1) { Iterator1 test_iter1 = iter1; Iterator2 test_iter2 = first2; for (;; ++test_iter1, ++test_iter2) { if (test_iter2 == last2) return std::make_pair(iter1, true); if (test_iter1 == last1) { if (test_iter2 != first2) return std::make_pair(iter1, false); else break; } if (*test_iter1 != *test_iter2) break; } } return std::make_pair(last1, false); } } // namespace detail template <typename SyncReadStream, typename Allocator> std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const std::string& delim, boost::system::error_code& ec) { std::size_t search_position = 0; for (;;) { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = b.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position; iterator end = iterator::end(buffers); // Look for a match. std::pair<iterator, bool> result = detail::partial_search( start_pos, end, delim.begin(), delim.end()); if (result.first != end) { if (result.second) { // Full match. We're done. ec = boost::system::error_code(); return result.first - begin + delim.length(); } else { // Partial match. Next search needs to start from beginning of match. search_position = result.first - begin; } } else { // No match. Next search can start with the new data. search_position = end - begin; } // Check if buffer is full. if (b.size() == b.max_size()) { ec = error::not_found; return 0; } // Need more data. std::size_t bytes_to_read = read_size_helper(b, 65536); b.commit(s.read_some(b.prepare(bytes_to_read), ec)); if (ec) return 0; } } #if defined(BOOST_ASIO_HAS_BOOST_REGEX) template <typename SyncReadStream, typename Allocator> inline std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const boost::regex& expr) { boost::system::error_code ec; std::size_t bytes_transferred = read_until(s, b, expr, ec); boost::asio::detail::throw_error(ec, "read_until"); return bytes_transferred; } template <typename SyncReadStream, typename Allocator> std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const boost::regex& expr, boost::system::error_code& ec) { std::size_t search_position = 0; for (;;) { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = b.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position; iterator end = iterator::end(buffers); // Look for a match. boost::match_results<iterator, typename std::vector<boost::sub_match<iterator> >::allocator_type> match_results; if (regex_search(start_pos, end, match_results, expr, boost::match_default | boost::match_partial)) { if (match_results[0].matched) { // Full match. We're done. ec = boost::system::error_code(); return match_results[0].second - begin; } else { // Partial match. Next search needs to start from beginning of match. search_position = match_results[0].first - begin; } } else { // No match. Next search can start with the new data. search_position = end - begin; } // Check if buffer is full. if (b.size() == b.max_size()) { ec = error::not_found; return 0; } // Need more data. std::size_t bytes_to_read = read_size_helper(b, 65536); b.commit(s.read_some(b.prepare(bytes_to_read), ec)); if (ec) return 0; } } #endif // defined(BOOST_ASIO_HAS_BOOST_REGEX) template <typename SyncReadStream, typename Allocator, typename MatchCondition> std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, MatchCondition match_condition, boost::system::error_code& ec, typename enable_if<is_match_condition<MatchCondition>::value>::type*) { std::size_t search_position = 0; for (;;) { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = b.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position; iterator end = iterator::end(buffers); // Look for a match. std::pair<iterator, bool> result = match_condition(start_pos, end); if (result.second) { // Full match. We're done. ec = boost::system::error_code(); return result.first - begin; } else if (result.first != end) { // Partial match. Next search needs to start from beginning of match. search_position = result.first - begin; } else { // No match. Next search can start with the new data. search_position = end - begin; } // Check if buffer is full. if (b.size() == b.max_size()) { ec = error::not_found; return 0; } // Need more data. std::size_t bytes_to_read = read_size_helper(b, 65536); b.commit(s.read_some(b.prepare(bytes_to_read), ec)); if (ec) return 0; } } template <typename SyncReadStream, typename Allocator, typename MatchCondition> inline std::size_t read_until(SyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, MatchCondition match_condition, typename enable_if<is_match_condition<MatchCondition>::value>::type*) { boost::system::error_code ec; std::size_t bytes_transferred = read_until(s, b, match_condition, ec); boost::asio::detail::throw_error(ec, "read_until"); return bytes_transferred; } namespace detail { template <typename AsyncReadStream, typename Allocator, typename ReadHandler> class read_until_delim_op { public: read_until_delim_op(AsyncReadStream& stream, boost::asio::basic_streambuf<Allocator>& streambuf, char delim, ReadHandler& handler) : stream_(stream), streambuf_(streambuf), delim_(delim), start_(0), search_position_(0), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) { } #if defined(BOOST_ASIO_HAS_MOVE) read_until_delim_op(const read_until_delim_op& other) : stream_(other.stream_), streambuf_(other.streambuf_), delim_(other.delim_), start_(other.start_), search_position_(other.search_position_), handler_(other.handler_) { } read_until_delim_op(read_until_delim_op&& other) : stream_(other.stream_), streambuf_(other.streambuf_), delim_(other.delim_), start_(other.start_), search_position_(other.search_position_), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) { } #endif // defined(BOOST_ASIO_HAS_MOVE) void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { const std::size_t not_found = (std::numeric_limits<std::size_t>::max)(); std::size_t bytes_to_read; switch (start_ = start) { case 1: for (;;) { { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = streambuf_.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position_; iterator end = iterator::end(buffers); // Look for a match. iterator iter = std::find(start_pos, end, delim_); if (iter != end) { // Found a match. We're done. search_position_ = iter - begin + 1; bytes_to_read = 0; } // No match yet. Check if buffer is full. else if (streambuf_.size() == streambuf_.max_size()) { search_position_ = not_found; bytes_to_read = 0; } // Need to read some more data. else { // Next search can start with the new data. search_position_ = end - begin; bytes_to_read = read_size_helper(streambuf_, 65536); } } // Check if we're done. if (!start && bytes_to_read == 0) break; // Start a new asynchronous read operation to obtain more data. stream_.async_read_some(streambuf_.prepare(bytes_to_read), BOOST_ASIO_MOVE_CAST(read_until_delim_op)(*this)); return; default: streambuf_.commit(bytes_transferred); if (ec || bytes_transferred == 0) break; } const boost::system::error_code result_ec = (search_position_ == not_found) ? error::not_found : ec; const std::size_t result_n = (ec || search_position_ == not_found) ? 0 : search_position_; handler_(result_ec, result_n); } } //private: AsyncReadStream& stream_; boost::asio::basic_streambuf<Allocator>& streambuf_; char delim_; int start_; std::size_t search_position_; ReadHandler handler_; }; template <typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void* asio_handler_allocate(std::size_t size, read_until_delim_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { return boost_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_delim_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename ReadHandler> inline bool asio_handler_is_continuation( read_until_delim_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { return this_handler->start_ == 0 ? true : boost_asio_handler_cont_helpers::is_continuation( this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void asio_handler_invoke(Function& function, read_until_delim_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void asio_handler_invoke(const Function& function, read_until_delim_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncReadStream, typename Allocator, typename ReadHandler> BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler, void (boost::system::error_code, std::size_t)) async_read_until(AsyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, char delim, BOOST_ASIO_MOVE_ARG(ReadHandler) handler) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a ReadHandler. BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; detail::async_result_init< ReadHandler, void (boost::system::error_code, std::size_t)> init( BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)); detail::read_until_delim_op<AsyncReadStream, Allocator, BOOST_ASIO_HANDLER_TYPE(ReadHandler, void (boost::system::error_code, std::size_t))>( s, b, delim, init.handler)( boost::system::error_code(), 0, 1); return init.result.get(); } namespace detail { template <typename AsyncReadStream, typename Allocator, typename ReadHandler> class read_until_delim_string_op { public: read_until_delim_string_op(AsyncReadStream& stream, boost::asio::basic_streambuf<Allocator>& streambuf, const std::string& delim, ReadHandler& handler) : stream_(stream), streambuf_(streambuf), delim_(delim), start_(0), search_position_(0), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) { } #if defined(BOOST_ASIO_HAS_MOVE) read_until_delim_string_op(const read_until_delim_string_op& other) : stream_(other.stream_), streambuf_(other.streambuf_), delim_(other.delim_), start_(other.start_), search_position_(other.search_position_), handler_(other.handler_) { } read_until_delim_string_op(read_until_delim_string_op&& other) : stream_(other.stream_), streambuf_(other.streambuf_), delim_(BOOST_ASIO_MOVE_CAST(std::string)(other.delim_)), start_(other.start_), search_position_(other.search_position_), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) { } #endif // defined(BOOST_ASIO_HAS_MOVE) void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { const std::size_t not_found = (std::numeric_limits<std::size_t>::max)(); std::size_t bytes_to_read; switch (start_ = start) { case 1: for (;;) { { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = streambuf_.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position_; iterator end = iterator::end(buffers); // Look for a match. std::pair<iterator, bool> result = detail::partial_search( start_pos, end, delim_.begin(), delim_.end()); if (result.first != end && result.second) { // Full match. We're done. search_position_ = result.first - begin + delim_.length(); bytes_to_read = 0; } // No match yet. Check if buffer is full. else if (streambuf_.size() == streambuf_.max_size()) { search_position_ = not_found; bytes_to_read = 0; } // Need to read some more data. else { if (result.first != end) { // Partial match. Next search needs to start from beginning of // match. search_position_ = result.first - begin; } else { // Next search can start with the new data. search_position_ = end - begin; } bytes_to_read = read_size_helper(streambuf_, 65536); } } // Check if we're done. if (!start && bytes_to_read == 0) break; // Start a new asynchronous read operation to obtain more data. stream_.async_read_some(streambuf_.prepare(bytes_to_read), BOOST_ASIO_MOVE_CAST(read_until_delim_string_op)(*this)); return; default: streambuf_.commit(bytes_transferred); if (ec || bytes_transferred == 0) break; } const boost::system::error_code result_ec = (search_position_ == not_found) ? error::not_found : ec; const std::size_t result_n = (ec || search_position_ == not_found) ? 0 : search_position_; handler_(result_ec, result_n); } } //private: AsyncReadStream& stream_; boost::asio::basic_streambuf<Allocator>& streambuf_; std::string delim_; int start_; std::size_t search_position_; ReadHandler handler_; }; template <typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void* asio_handler_allocate(std::size_t size, read_until_delim_string_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { return boost_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_delim_string_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename ReadHandler> inline bool asio_handler_is_continuation( read_until_delim_string_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { return this_handler->start_ == 0 ? true : boost_asio_handler_cont_helpers::is_continuation( this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void asio_handler_invoke(Function& function, read_until_delim_string_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename ReadHandler> inline void asio_handler_invoke(const Function& function, read_until_delim_string_op<AsyncReadStream, Allocator, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncReadStream, typename Allocator, typename ReadHandler> BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler, void (boost::system::error_code, std::size_t)) async_read_until(AsyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const std::string& delim, BOOST_ASIO_MOVE_ARG(ReadHandler) handler) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a ReadHandler. BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; detail::async_result_init< ReadHandler, void (boost::system::error_code, std::size_t)> init( BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)); detail::read_until_delim_string_op<AsyncReadStream, Allocator, BOOST_ASIO_HANDLER_TYPE(ReadHandler, void (boost::system::error_code, std::size_t))>( s, b, delim, init.handler)( boost::system::error_code(), 0, 1); return init.result.get(); } #if defined(BOOST_ASIO_HAS_BOOST_REGEX) namespace detail { template <typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> class read_until_expr_op { public: read_until_expr_op(AsyncReadStream& stream, boost::asio::basic_streambuf<Allocator>& streambuf, const boost::regex& expr, ReadHandler& handler) : stream_(stream), streambuf_(streambuf), expr_(expr), start_(0), search_position_(0), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) { } #if defined(BOOST_ASIO_HAS_MOVE) read_until_expr_op(const read_until_expr_op& other) : stream_(other.stream_), streambuf_(other.streambuf_), expr_(other.expr_), start_(other.start_), search_position_(other.search_position_), handler_(other.handler_) { } read_until_expr_op(read_until_expr_op&& other) : stream_(other.stream_), streambuf_(other.streambuf_), expr_(other.expr_), start_(other.start_), search_position_(other.search_position_), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) { } #endif // defined(BOOST_ASIO_HAS_MOVE) void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { const std::size_t not_found = (std::numeric_limits<std::size_t>::max)(); std::size_t bytes_to_read; switch (start_ = start) { case 1: for (;;) { { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = streambuf_.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position_; iterator end = iterator::end(buffers); // Look for a match. boost::match_results<iterator, typename std::vector<boost::sub_match<iterator> >::allocator_type> match_results; bool match = regex_search(start_pos, end, match_results, expr_, boost::match_default | boost::match_partial); if (match && match_results[0].matched) { // Full match. We're done. search_position_ = match_results[0].second - begin; bytes_to_read = 0; } // No match yet. Check if buffer is full. else if (streambuf_.size() == streambuf_.max_size()) { search_position_ = not_found; bytes_to_read = 0; } // Need to read some more data. else { if (match) { // Partial match. Next search needs to start from beginning of // match. search_position_ = match_results[0].first - begin; } else { // Next search can start with the new data. search_position_ = end - begin; } bytes_to_read = read_size_helper(streambuf_, 65536); } } // Check if we're done. if (!start && bytes_to_read == 0) break; // Start a new asynchronous read operation to obtain more data. stream_.async_read_some(streambuf_.prepare(bytes_to_read), BOOST_ASIO_MOVE_CAST(read_until_expr_op)(*this)); return; default: streambuf_.commit(bytes_transferred); if (ec || bytes_transferred == 0) break; } const boost::system::error_code result_ec = (search_position_ == not_found) ? error::not_found : ec; const std::size_t result_n = (ec || search_position_ == not_found) ? 0 : search_position_; handler_(result_ec, result_n); } } //private: AsyncReadStream& stream_; boost::asio::basic_streambuf<Allocator>& streambuf_; RegEx expr_; int start_; std::size_t search_position_; ReadHandler handler_; }; template <typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> inline void* asio_handler_allocate(std::size_t size, read_until_expr_op<AsyncReadStream, Allocator, RegEx, ReadHandler>* this_handler) { return boost_asio_handler_alloc_helpers::allocate( size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> inline void asio_handler_deallocate(void* pointer, std::size_t size, read_until_expr_op<AsyncReadStream, Allocator, RegEx, ReadHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> inline bool asio_handler_is_continuation( read_until_expr_op<AsyncReadStream, Allocator, RegEx, ReadHandler>* this_handler) { return this_handler->start_ == 0 ? true : boost_asio_handler_cont_helpers::is_continuation( this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> inline void asio_handler_invoke(Function& function, read_until_expr_op<AsyncReadStream, Allocator, RegEx, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename RegEx, typename ReadHandler> inline void asio_handler_invoke(const Function& function, read_until_expr_op<AsyncReadStream, Allocator, RegEx, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncReadStream, typename Allocator, typename ReadHandler> BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler, void (boost::system::error_code, std::size_t)) async_read_until(AsyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, const boost::regex& expr, BOOST_ASIO_MOVE_ARG(ReadHandler) handler) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a ReadHandler. BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; detail::async_result_init< ReadHandler, void (boost::system::error_code, std::size_t)> init( BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)); detail::read_until_expr_op<AsyncReadStream, Allocator, boost::regex, BOOST_ASIO_HANDLER_TYPE(ReadHandler, void (boost::system::error_code, std::size_t))>( s, b, expr, init.handler)( boost::system::error_code(), 0, 1); return init.result.get(); } #endif // defined(BOOST_ASIO_HAS_BOOST_REGEX) namespace detail { template <typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> class read_until_match_op { public: read_until_match_op(AsyncReadStream& stream, boost::asio::basic_streambuf<Allocator>& streambuf, MatchCondition match_condition, ReadHandler& handler) : stream_(stream), streambuf_(streambuf), match_condition_(match_condition), start_(0), search_position_(0), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) { } #if defined(BOOST_ASIO_HAS_MOVE) read_until_match_op(const read_until_match_op& other) : stream_(other.stream_), streambuf_(other.streambuf_), match_condition_(other.match_condition_), start_(other.start_), search_position_(other.search_position_), handler_(other.handler_) { } read_until_match_op(read_until_match_op&& other) : stream_(other.stream_), streambuf_(other.streambuf_), match_condition_(other.match_condition_), start_(other.start_), search_position_(other.search_position_), handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) { } #endif // defined(BOOST_ASIO_HAS_MOVE) void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { const std::size_t not_found = (std::numeric_limits<std::size_t>::max)(); std::size_t bytes_to_read; switch (start_ = start) { case 1: for (;;) { { // Determine the range of the data to be searched. typedef typename boost::asio::basic_streambuf< Allocator>::const_buffers_type const_buffers_type; typedef boost::asio::buffers_iterator<const_buffers_type> iterator; const_buffers_type buffers = streambuf_.data(); iterator begin = iterator::begin(buffers); iterator start_pos = begin + search_position_; iterator end = iterator::end(buffers); // Look for a match. std::pair<iterator, bool> result = match_condition_(start_pos, end); if (result.second) { // Full match. We're done. search_position_ = result.first - begin; bytes_to_read = 0; } // No match yet. Check if buffer is full. else if (streambuf_.size() == streambuf_.max_size()) { search_position_ = not_found; bytes_to_read = 0; } // Need to read some more data. else { if (result.first != end) { // Partial match. Next search needs to start from beginning of // match. search_position_ = result.first - begin; } else { // Next search can start with the new data. search_position_ = end - begin; } bytes_to_read = read_size_helper(streambuf_, 65536); } } // Check if we're done. if (!start && bytes_to_read == 0) break; // Start a new asynchronous read operation to obtain more data. stream_.async_read_some(streambuf_.prepare(bytes_to_read), BOOST_ASIO_MOVE_CAST(read_until_match_op)(*this)); return; default: streambuf_.commit(bytes_transferred); if (ec || bytes_transferred == 0) break; } const boost::system::error_code result_ec = (search_position_ == not_found) ? error::not_found : ec; const std::size_t result_n = (ec || search_position_ == not_found) ? 0 : search_position_; handler_(result_ec, result_n); } } //private: AsyncReadStream& stream_; boost::asio::basic_streambuf<Allocator>& streambuf_; MatchCondition match_condition_; int start_; std::size_t search_position_; ReadHandler handler_; }; template <typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> inline void* asio_handler_allocate(std::size_t size, read_until_match_op<AsyncReadStream, Allocator, MatchCondition, ReadHandler>* this_handler) { return boost_asio_handler_alloc_helpers::allocate( size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> inline void asio_handler_deallocate(void* pointer, std::size_t size, read_until_match_op<AsyncReadStream, Allocator, MatchCondition, ReadHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> inline bool asio_handler_is_continuation( read_until_match_op<AsyncReadStream, Allocator, MatchCondition, ReadHandler>* this_handler) { return this_handler->start_ == 0 ? true : boost_asio_handler_cont_helpers::is_continuation( this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> inline void asio_handler_invoke(Function& function, read_until_match_op<AsyncReadStream, Allocator, MatchCondition, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } template <typename Function, typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> inline void asio_handler_invoke(const Function& function, read_until_match_op<AsyncReadStream, Allocator, MatchCondition, ReadHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncReadStream, typename Allocator, typename MatchCondition, typename ReadHandler> BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler, void (boost::system::error_code, std::size_t)) async_read_until(AsyncReadStream& s, boost::asio::basic_streambuf<Allocator>& b, MatchCondition match_condition, BOOST_ASIO_MOVE_ARG(ReadHandler) handler, typename enable_if<is_match_condition<MatchCondition>::value>::type*) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a ReadHandler. BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; detail::async_result_init< ReadHandler, void (boost::system::error_code, std::size_t)> init( BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)); detail::read_until_match_op<AsyncReadStream, Allocator, MatchCondition, BOOST_ASIO_HANDLER_TYPE(ReadHandler, void (boost::system::error_code, std::size_t))>( s, b, match_condition, init.handler)( boost::system::error_code(), 0, 1); return init.result.get(); } } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_IMPL_READ_UNTIL_HPP