// | |
// impl/read_until.hpp | |
// ~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 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/limits.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> | |
#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); | |
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 = begin + search_position; | |
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. | |
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); | |
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 = begin + search_position; | |
iterator end = iterator::end(buffers); | |
// Look for a match. | |
std::pair<iterator, bool> result = 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. | |
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> | |
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 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 = 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, 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; | |
} | |
} | |
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 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 = begin + search_position; | |
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. | |
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 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_op | |
{ | |
public: | |
read_until_delim_op(AsyncReadStream& stream, | |
boost::asio::basic_streambuf<Allocator>& streambuf, | |
char delim, ReadHandler handler) | |
: stream_(stream), | |
streambuf_(streambuf), | |
delim_(delim), | |
search_position_(0), | |
handler_(handler) | |
{ | |
} | |
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) | |
{ | |
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 = begin + search_position_; | |
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. | |
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), *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_; | |
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 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> | |
void async_read_until(AsyncReadStream& s, | |
boost::asio::basic_streambuf<Allocator>& b, char delim, ReadHandler handler) | |
{ | |
detail::read_until_delim_op< | |
AsyncReadStream, Allocator, ReadHandler>( | |
s, b, delim, handler)( | |
boost::system::error_code(), 0, 1); | |
} | |
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), | |
search_position_(0), | |
handler_(handler) | |
{ | |
} | |
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) | |
{ | |
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 = begin + search_position_; | |
iterator end = iterator::end(buffers); | |
// Look for a match. | |
std::pair<iterator, bool> result = detail::partial_search( | |
start, 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), *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_; | |
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 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> | |
void async_read_until(AsyncReadStream& s, | |
boost::asio::basic_streambuf<Allocator>& b, const std::string& delim, | |
ReadHandler handler) | |
{ | |
detail::read_until_delim_string_op< | |
AsyncReadStream, Allocator, ReadHandler>( | |
s, b, delim, handler)( | |
boost::system::error_code(), 0, 1); | |
} | |
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), | |
search_position_(0), | |
handler_(handler) | |
{ | |
} | |
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) | |
{ | |
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 = 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, 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), *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_; | |
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 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> | |
void async_read_until(AsyncReadStream& s, | |
boost::asio::basic_streambuf<Allocator>& b, const boost::regex& expr, | |
ReadHandler handler) | |
{ | |
detail::read_until_expr_op<AsyncReadStream, | |
Allocator, boost::regex, ReadHandler>( | |
s, b, expr, handler)( | |
boost::system::error_code(), 0, 1); | |
} | |
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), | |
search_position_(0), | |
handler_(handler) | |
{ | |
} | |
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) | |
{ | |
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 = begin + search_position_; | |
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. | |
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), *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_; | |
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 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> | |
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*) | |
{ | |
detail::read_until_match_op< | |
AsyncReadStream, Allocator, MatchCondition, ReadHandler>( | |
s, b, match_condition, handler)( | |
boost::system::error_code(), 0, 1); | |
} | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // BOOST_ASIO_IMPL_READ_UNTIL_HPP |