read_until.hpp

这是国外的resip协议栈

//
// read_until.hpp
// ~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2007 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 ASIO_READ_UNTIL_HPP
#define ASIO_READ_UNTIL_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/push_options.hpp"

#include "asio/detail/push_options.hpp"
#include <cstddef>
#include <boost/config.hpp>
#include <boost/regex.hpp>
#include <string>
#include "asio/detail/pop_options.hpp"

#include "asio/basic_streambuf.hpp"
#include "asio/error.hpp"

namespace asio {

/**
 * @defgroup read_until asio::read_until
 */
/*@{*/

/// Read data into a streambuf until a delimiter is encountered.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains the specified delimiter. The call will block
 * until one of the following conditions is true:
 *
 * @li The get area of the streambuf contains the specified delimiter.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains the
 * delimiter, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support
 * the SyncReadStream concept.
 *
 * @param b A streambuf object into which the data will be read.
 *
 * @param delim The delimiter character.
 *
 * @returns The number of bytes in the streambuf's get area up to and including
 * the delimiter.
 *
 * @throws asio::system_error Thrown on failure.
 *
 * @par Example
 * To read data into a streambuf until a newline is encountered:
 * @code asio::streambuf b;
 * asio::read_until(s, b, '\n');
 * std::istream is(&b);
 * std::string line;
 * std::getline(is, line); @endcode
 */
template <typename SyncReadStream, typename Allocator>
std::size_t read_until(SyncReadStream& s,
    asio::basic_streambuf<Allocator>& b, char delim);

/// Read data into a streambuf until a delimiter is encountered.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains the specified delimiter. The call will block
 * until one of the following conditions is true:
 *
 * @li The get area of the streambuf contains the specified delimiter.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains the
 * delimiter, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support
 * the SyncReadStream concept.
 *
 * @param b A streambuf object into which the data will be read.
 *
 * @param delim The delimiter character.
 *
 * @param ec Set to indicate what error occurred, if any.
 *
 * @returns The number of bytes in the streambuf's get area up to and including
 * the delimiter. Returns 0 if an error occurred.
 */
template <typename SyncReadStream, typename Allocator>
std::size_t read_until(SyncReadStream& s,
    asio::basic_streambuf<Allocator>& b, char delim,
    asio::error_code& ec);

/// Read data into a streambuf until a delimiter is encountered.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains the specified delimiter. The call will block
 * until one of the following conditions is true:
 *
 * @li The get area of the streambuf contains the specified delimiter.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains the
 * delimiter, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support
 * the SyncReadStream concept.
 *
 * @param b A streambuf object into which the data will be read.
 *
 * @param delim The delimiter string.
 *
 * @returns The number of bytes in the streambuf's get area up to and including
 * the delimiter.
 *
 * @throws asio::system_error Thrown on failure.
 *
 * @par Example
 * To read data into a streambuf until a newline is encountered:
 * @code asio::streambuf b;
 * asio::read_until(s, b, "\r\n");
 * std::istream is(&b);
 * std::string line;
 * std::getline(is, line); @endcode
 */
template <typename SyncReadStream, typename Allocator>
std::size_t read_until(SyncReadStream& s,
    asio::basic_streambuf<Allocator>& b, const std::string& delim);

/// Read data into a streambuf until a delimiter is encountered.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains the specified delimiter. The call will block
 * until one of the following conditions is true:
 *
 * @li The get area of the streambuf contains the specified delimiter.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains the
 * delimiter, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support
 * the SyncReadStream concept.
 *
 * @param b A streambuf object into which the data will be read.
 *
 * @param delim The delimiter string.
 *
 * @param ec Set to indicate what error occurred, if any.
 *
 * @returns The number of bytes in the streambuf's get area up to and including
 * the delimiter. Returns 0 if an error occurred.
 */
template <typename SyncReadStream, typename Allocator>
std::size_t read_until(SyncReadStream& s,
    asio::basic_streambuf<Allocator>& b, const std::string& delim,
    asio::error_code& ec);

/// Read data into a streambuf until a regular expression is located.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains some data that matches a regular expression.
 * The call will block until one of the following conditions is true:
 *
 * @li A substring of the streambuf's get area matches the regular expression.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains data that
 * matches the regular expression, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support
 * the SyncReadStream concept.
 *
 * @param b A streambuf object into which the data will be read.
 *
 * @param expr The regular expression.
 *
 * @returns The number of bytes in the streambuf's get area up to and including
 * the substring that matches the regular expression.
 *
 * @throws asio::system_error Thrown on failure.
 *
 * @par Example
 * To read data into a streambuf until a CR-LF sequence is encountered:
 * @code asio::streambuf b;
 * asio::read_until(s, b, boost::regex("\r\n"));
 * std::istream is(&b);
 * std::string line;
 * std::getline(is, line); @endcode
 */
template <typename SyncReadStream, typename Allocator>
std::size_t read_until(SyncReadStream& s,
    asio::basic_streambuf<Allocator>& b, const boost::regex& expr);

/// Read data into a streambuf until a regular expression is located.
/**
 * This function is used to read data into the specified streambuf until the
 * streambuf's get area contains some data that matches a regular expression.
 * The call will block until one of the following conditions is true:
 *
 * @li A substring of the streambuf's get area matches the regular expression.
 *
 * @li An error occurred.
 *
 * This operation is implemented in terms of zero or more calls to the stream's
 * read_some function. If the streambuf's get area already contains data that
 * matches the regular expression, the function returns immediately.
 *
 * @param s The stream from which the data is to be read. The type must support