95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_IO_POSIX_HPP
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#define __UTIL_IO_POSIX_HPP
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#include "posix/fd.hpp"
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#include "view.hpp"
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#include <type_traits>
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#include <experimental/filesystem>
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#include <sys/mman.h>
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#include <fcntl.h>
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namespace util {
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namespace detail::posix {
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// represents a memory mapped file.
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//
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// the data pointer may be null in the case of a zero length file. it
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// is expected that the user will take measures to avoid dereferencing
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// such a pointer.
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class mapped_file {
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public:
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using value_type = uint8_t;
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using reference = value_type&;
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using const_reference = const value_type&;
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using iterator = value_type*;
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using const_iterator = const value_type*;
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using difference_type = std::iterator_traits<iterator>::difference_type;
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using size_type = size_t;
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mapped_file (const std::experimental::filesystem::path&,
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int fflags = O_RDONLY | O_BINARY,
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int mflags = PROT_READ);
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mapped_file (const util::posix::fd&,
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int mflags = PROT_READ);
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mapped_file (const mapped_file&) = delete;
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mapped_file& operator= (const mapped_file&) = delete;
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mapped_file (const mapped_file&&) noexcept;
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mapped_file& operator= (mapped_file&&) noexcept;
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~mapped_file ();
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bool empty (void) const;
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/// returns the total allocated mapped region in bytes.
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///
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/// result is typed size_t (rather than the native signed type)
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/// because we often use this in conjunction with sizeof and
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/// packed structure.
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///
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/// it is greatly simpler to cast to signed where it's actually
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/// required rather than the other way around.
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size_type size (void) const;
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const_iterator data (void) const &;
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iterator data (void) &;
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iterator begin (void) &;
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iterator end (void) &;
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const_iterator begin (void) const &;
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const_iterator end (void) const &;
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const_iterator cbegin (void) const &;
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const_iterator cend (void) const &;
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private:
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uint8_t *m_data;
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size_t m_size;
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};
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}
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typedef detail::posix::mapped_file mapped_file;
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}
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#endif
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