forked from boostorg/beast
Vinnie Falco
75b0571e83
fix #373 * concepts.hpp is renamed to type_traits.hpp * Body reader and writer concepts are renamed
103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
//
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// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BEAST_EXAMPLE_FILE_BODY_H_INCLUDED
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#define BEAST_EXAMPLE_FILE_BODY_H_INCLUDED
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#include <beast/core/error.hpp>
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#include <beast/http/message.hpp>
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#include <boost/asio/buffer.hpp>
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#include <boost/assert.hpp>
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#include <boost/filesystem.hpp>
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#include <boost/optional.hpp>
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#include <cstdio>
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#include <cstdint>
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namespace beast {
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namespace http {
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struct file_body
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{
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using value_type = std::string;
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class reader
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{
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std::uint64_t size_ = 0;
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std::uint64_t offset_ = 0;
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std::string const& path_;
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FILE* file_ = nullptr;
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char buf_[4096];
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std::size_t buf_len_;
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public:
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using is_deferred = std::true_type;
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using const_buffers_type =
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boost::asio::const_buffers_1;
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reader(reader&&) = default;
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reader(reader const&) = delete;
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reader& operator=(reader const&) = delete;
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template<bool isRequest, class Fields>
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reader(message<isRequest,
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file_body, Fields> const& m)
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: path_(m.body)
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{
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}
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~reader()
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{
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if(file_)
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fclose(file_);
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}
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void
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init(error_code& ec)
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{
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file_ = fopen(path_.c_str(), "rb");
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if(! file_)
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ec = error_code{errno,
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system_category()};
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else
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size_ = boost::filesystem::file_size(path_);
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}
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std::uint64_t
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content_length() const
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{
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return size_;
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}
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boost::optional<std::pair<const_buffers_type, bool>>
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get(error_code& ec)
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{
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if(size_ - offset_ < sizeof(buf_))
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buf_len_ = static_cast<std::size_t>(
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size_ - offset_);
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else
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buf_len_ = sizeof(buf_);
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auto const nread = fread(
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buf_, 1, sizeof(buf_), file_);
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if(ferror(file_))
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{
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ec = error_code(errno, system_category());
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return boost::none;
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}
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BOOST_ASSERT(nread != 0);
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offset_ += nread;
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return {{const_buffers_type{buf_, nread},
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offset_ >= size_}};
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}
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};
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};
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} // http
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} // beast
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#endif
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