143 lines
3.3 KiB
C++
143 lines
3.3 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 2010-2014 Danny Robson <danny@nerdcruft.net>
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*/
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#include "io.hpp"
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#include "cast.hpp"
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#include "debug.hpp"
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#include "posix/fd.hpp"
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#include "posix/except.hpp"
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#include <sys/stat.h>
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using util::detail::posix::mapped_file;
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//////////////////////////////////////////////////////////////////////////////
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mapped_file::mapped_file (const std::experimental::filesystem::path &path,
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int fflags,
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int mflags):
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mapped_file (util::posix::fd (path, fflags), mflags)
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{ ; }
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//-----------------------------------------------------------------------------
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mapped_file::mapped_file (const ::util::posix::fd &src, int mflags)
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{
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struct stat meta;
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::util::posix::error::try_value (fstat (src, &meta));
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m_size = util::cast::sign<size_t> (meta.st_size);
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m_data = static_cast<uint8_t*> (mmap (nullptr, m_size, mflags, MAP_SHARED, src, 0));
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if (m_data == MAP_FAILED)
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::util::posix::error::throw_code ();
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}
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//----------------------------------------------------------------------------
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mapped_file::~mapped_file ()
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{
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CHECK (m_data != NULL);
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munmap (m_data, m_size);
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}
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//----------------------------------------------------------------------------
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size_t
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mapped_file::size (void) const
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{
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return m_size;
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}
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//-----------------------------------------------------------------------------
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bool
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mapped_file::empty (void) const
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{
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return size () == 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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uint8_t*
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mapped_file::data (void) &
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{
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CHECK (m_size > 0);
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CHECK (m_data != NULL);
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return m_data;
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::data (void) const &
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{
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CHECK (m_size > 0);
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CHECK (m_data != NULL);
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return m_data;
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}
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//----------------------------------------------------------------------------
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uint8_t*
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mapped_file::begin (void) &
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{
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return data ();
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}
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//----------------------------------------------------------------------------
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uint8_t*
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mapped_file::end (void) &
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{
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return data () + size ();
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}
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//-----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::begin (void) const &
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{
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return data ();
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}
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//-----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::end (void) const &
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{
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return data () + size ();
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::cbegin (void) const &
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{
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return data ();
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::cend (void) const &
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{
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return data () + size ();
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}
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