Imported existing code

libraries/include/boost/asio/impl/read_until.ipp

@@ -0,0 +1,989 @@
+//
+// read_until.ipp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 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_READ_UNTIL_IPP
+#define BOOST_ASIO_READ_UNTIL_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <algorithm>
+#include <limits>
+#include <string>
+#include <utility>
+#include <boost/asio/detail/pop_options.hpp>
+
+#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_invoke_helpers.hpp>
+#include <boost/asio/detail/throw_error.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);
+  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 next_search_start = 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 = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    iterator iter = std::find(start, 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.
+      next_search_start = 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_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), 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);
+  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 next_search_start = 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 = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = boost::asio::detail::partial_search(
+        start, 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.
+        next_search_start = result.first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = 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_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), 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 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);
+  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 next_search_start = 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 = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    boost::match_results<iterator> match_results;
+    if (boost::regex_search(start, 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.
+        next_search_start = match_results[0].first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = 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_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+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 boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  std::size_t next_search_start = 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 = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = match_condition(start, 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.
+      next_search_start = result.first - begin;
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = 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_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), 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 boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  boost::system::error_code ec;
+  std::size_t bytes_transferred = read_until(s, b, match_condition, ec);
+  boost::asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  class read_until_delim_handler
+  {
+  public:
+    read_until_delim_handler(AsyncReadStream& stream,
+        boost::asio::basic_streambuf<Allocator>& streambuf, char delim,
+        std::size_t next_search_start, ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        delim_(delim),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const boost::system::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 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 = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      iterator iter = std::find(start, end, delim_);
+      if (iter != end)
+      {
+        // Found a match. We're done.
+        std::size_t bytes = iter - begin + 1;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // No match. Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        boost::system::error_code ec(error::not_found);
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Next search can start with the new data.
+      next_search_start_ = end - begin;
+
+      // 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_;
+    boost::asio::basic_streambuf<Allocator>& streambuf_;
+    char delim_;
+    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_delim_handler<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_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    boost_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_delim_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    boost_asio_handler_invoke_helpers::invoke(
+        function, &this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    boost::asio::basic_streambuf<Allocator>& b, char delim, ReadHandler handler)
+{
+  // 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 end = iterator::end(buffers);
+
+  // Look for a match.
+  iterator iter = std::find(begin, end, delim);
+  if (iter != end)
+  {
+    // Found a match. We're done.
+    boost::system::error_code ec;
+    std::size_t bytes = iter - begin + 1;
+    s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+    return;
+  }
+
+  // No match. Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    boost::system::error_code ec(error::not_found);
+    s.get_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_handler<AsyncReadStream, Allocator, ReadHandler>(
+        s, b, delim, end - begin, handler));
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  class read_until_delim_string_handler
+  {
+  public:
+    read_until_delim_string_handler(AsyncReadStream& stream,
+        boost::asio::basic_streambuf<Allocator>& streambuf,
+        const std::string& delim, std::size_t next_search_start,
+        ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        delim_(delim),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const boost::system::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 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 = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      std::pair<iterator, bool> result = boost::asio::detail::partial_search(
+          start, end, delim_.begin(), delim_.end());
+      if (result.first != end)
+      {
+        if (result.second)
+        {
+          // Full match. We're done.
+          std::size_t bytes = result.first - begin + delim_.length();
+          handler_(ec, bytes);
+          return;
+        }
+        else
+        {
+          // Partial match. Next search needs to start from beginning of match.
+          next_search_start_ = result.first - begin;
+        }
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        boost::system::error_code ec2(error::not_found);
+        handler_(ec2, 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_;
+    boost::asio::basic_streambuf<Allocator>& streambuf_;
+    std::string delim_;
+    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_delim_string_handler<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_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    boost_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_delim_string_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    boost_asio_handler_invoke_helpers::invoke(
+        function, &this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    boost::asio::basic_streambuf<Allocator>& b, const std::string& delim,
+    ReadHandler handler)
+{
+  // 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 end = iterator::end(buffers);
+
+  // Look for a match.
+  std::size_t next_search_start;
+  std::pair<iterator, bool> result = boost::asio::detail::partial_search(
+      begin, end, delim.begin(), delim.end());
+  if (result.first != end)
+  {
+    if (result.second)
+    {
+      // Full match. We're done.
+      boost::system::error_code ec;
+      std::size_t bytes = result.first - begin + delim.length();
+      s.get_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 - begin;
+    }
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    boost::system::error_code ec(error::not_found);
+    s.get_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,
+        boost::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 boost::system::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 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 = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      boost::match_results<iterator> match_results;
+      if (boost::regex_search(start, 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 - begin;
+          handler_(ec, bytes);
+          return;
+        }
+        else
+        {
+          // Partial match. Next search needs to start from beginning of match.
+          next_search_start_ = match_results[0].first - begin;
+        }
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        boost::system::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_;
+    boost::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 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_expr_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    boost_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)
+  {
+    boost_asio_handler_invoke_helpers::invoke(
+        function, &this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    boost::asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    ReadHandler handler)
+{
+  // 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 end = iterator::end(buffers);
+
+  // 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.
+      boost::system::error_code ec;
+      std::size_t bytes = match_results[0].second - begin;
+      s.get_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 - begin;
+    }
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    boost::system::error_code ec(error::not_found);
+    s.get_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 detail
+{
+  template <typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  class read_until_match_handler
+  {
+  public:
+    read_until_match_handler(AsyncReadStream& stream,
+        boost::asio::basic_streambuf<Allocator>& streambuf,
+        MatchCondition match_condition, std::size_t next_search_start,
+        ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        match_condition_(match_condition),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const boost::system::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 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 = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      std::pair<iterator, bool> result = match_condition_(start, end);
+      if (result.second)
+      {
+        // Full match. We're done.
+        std::size_t bytes = result.first - begin;
+        handler_(ec, bytes);
+        return;
+      }
+      else if (result.first != end)
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        next_search_start_ = result.first - begin;
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        boost::system::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_;
+    boost::asio::basic_streambuf<Allocator>& streambuf_;
+    MatchCondition match_condition_;
+    std::size_t next_search_start_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_match_handler<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_handler<AsyncReadStream,
+        Allocator, MatchCondition, ReadHandler>* this_handler)
+  {
+    boost_asio_handler_alloc_helpers::deallocate(
+        pointer, size, &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_handler<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>
+void async_read_until(AsyncReadStream& s,
+    boost::asio::basic_streambuf<Allocator>& b,
+    MatchCondition match_condition, ReadHandler handler,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  // 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 end = iterator::end(buffers);
+
+  // Look for a match.
+  std::size_t next_search_start;
+  std::pair<iterator, bool> result = match_condition(begin, end);
+  if (result.second)
+  {
+    // Full match. We're done.
+    boost::system::error_code ec;
+    std::size_t bytes = result.first - begin;
+    s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+    return;
+  }
+  else if (result.first != end)
+  {
+    // Partial match. Next search needs to start from beginning of match.
+    next_search_start = result.first - begin;
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    boost::system::error_code ec(error::not_found);
+    s.get_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_match_handler<
+        AsyncReadStream, Allocator, MatchCondition, ReadHandler>(
+          s, b, match_condition, next_search_start, handler));
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_READ_UNTIL_IPP