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https://github.com/boostorg/beast.git
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Vinnie Falco
cf43f516d2
fix #139, fix #140 * Writer uses write instead of operator() * Refactor traits to use void_t * Remove is_ReadableBody, is_WritableBody * Add has_reader, has_writer, is_Reader, is_Writer * More friendly compile errors on failed concept checks
89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
//
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// Copyright (c) 2013-2016 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/http/body_type.hpp>
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#include <boost/asio/buffer.hpp>
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#include <boost/filesystem.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 writer
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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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writer(writer const&) = delete;
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writer& operator=(writer const&) = delete;
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template<bool isRequest, class Headers>
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writer(message<isRequest, file_body, Headers> const& m) noexcept
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: path_(m.body)
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{
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}
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~writer()
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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) noexcept
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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 = boost::system::errc::make_error_code(
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static_cast<boost::system::errc::errc_t>(errno));
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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 noexcept
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{
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return size_;
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}
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template<class WriteFunction>
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boost::tribool
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write(resume_context&&, error_code&,
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WriteFunction&& wf) noexcept
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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(buf_, 1, sizeof(buf_), file_);
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(void)nread;
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offset_ += buf_len_;
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wf(boost::asio::buffer(buf_, buf_len_));
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return 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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