rippled/include/beast/http/streambuf_body.hpp

//
// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail 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 BEAST_HTTP_STREAMBUF_BODY_HPP
#define BEAST_HTTP_STREAMBUF_BODY_HPP

#include <beast/http/error.hpp>
#include <beast/http/message.hpp>
#include <beast/buffer_cat.hpp>
#include <beast/streambuf.hpp>
#include <memory>
#include <string>

namespace beast {
namespace http {

/** A Body represented by a Streambuf
*/
template<class Streambuf>
struct basic_streambuf_body
{
    using value_type = Streambuf;

    class reader
    {
        value_type& sb_;

    public:
        template<bool isRequest, class Allocator>
        explicit
        reader(message<isRequest,
                basic_streambuf_body, Allocator>& m) noexcept
            : sb_(m.body)
        {
        }

        void
        write(void const* data,
            std::size_t size, error_code&) noexcept
        {
            using boost::asio::buffer;
            using boost::asio::buffer_copy;
            sb_.commit(buffer_copy(
                sb_.prepare(size), buffer(data, size)));
        }
    };

    class writer
    {
        Streambuf const& body_;

    public:
        template<bool isRequest, class Allocator>
        explicit
        writer(message<isRequest, basic_streambuf_body,
                Allocator> const& m)
            : body_(m.body)
        {
        }

        void
        init(error_code& ec)
        {
        }

        std::size_t
        content_length() const
        {
            return body_.size();
        }

        template<class Write>
        boost::tribool
        operator()(resume_context&&, error_code&, Write&& write)
        {
            write(body_.data());
            return true;
        }
    };
};

using streambuf_body = basic_streambuf_body<streambuf>;

} // http
} // beast

#endif