boost/asio/impl/read_until.ipp
//
// 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