libcruft-util/io_posix.cpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2010-2014 Danny Robson <danny@nerdcruft.net>
*/
#include "io.hpp"
#include "cast.hpp"
#include "debug.hpp"
#include "posix/fd.hpp"
#include "posix/except.hpp"
#include <sys/stat.h>
using util::detail::posix::mapped_file;
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//////////////////////////////////////////////////////////////////////////////
mapped_file::mapped_file (const std::experimental::filesystem::path &path,
int fflags,
int mflags):
mapped_file (util::posix::fd (path, fflags), mflags)
{ ; }
//-----------------------------------------------------------------------------
mapped_file::mapped_file (const ::util::posix::fd &src, int mflags)
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{
struct stat meta;
::util::posix::error::try_value (fstat (src, &meta));
m_size = util::cast::sign<size_t> (meta.st_size);
if (!m_size) {
m_data = nullptr;
return;
}
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m_data = static_cast<uint8_t*> (mmap (nullptr, m_size, mflags, MAP_SHARED, src, 0));
if (m_data == MAP_FAILED)
::util::posix::error::throw_code ();
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}
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//----------------------------------------------------------------------------
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mapped_file::~mapped_file ()
{
if (!m_data)
return;
munmap (m_data, m_size);
}
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//----------------------------------------------------------------------------
size_t
mapped_file::size (void) const
{
return m_size;
}
//-----------------------------------------------------------------------------
bool
mapped_file::empty (void) const
{
return size () == 0;
}
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//////////////////////////////////////////////////////////////////////////////
uint8_t*
mapped_file::data (void) &
{
return m_data;
}
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//----------------------------------------------------------------------------
const uint8_t*
mapped_file::data (void) const &
{
return m_data;
}
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//----------------------------------------------------------------------------
uint8_t*
mapped_file::begin (void) &
{
return data ();
}
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//----------------------------------------------------------------------------
uint8_t*
mapped_file::end (void) &
{
return data () + size ();
}
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//-----------------------------------------------------------------------------
const uint8_t*
mapped_file::begin (void) const &
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{
return data ();
}
//-----------------------------------------------------------------------------
const uint8_t*
mapped_file::end (void) const &
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{
return data () + size ();
}
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//----------------------------------------------------------------------------
const uint8_t*
mapped_file::cbegin (void) const &
{
return data ();
}
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//----------------------------------------------------------------------------
const uint8_t*
mapped_file::cend (void) const &
{
return data () + size ();
}