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// Copyright (c) 2014-2017 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAOCPP_PEGTL_INCLUDE_INTERNAL_FILE_MAPPER_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_FILE_MAPPER_HPP
#include <sys/mman.h>
#include <unistd.h>
#include "../config.hpp"
#include "file_opener.hpp"
#include "../input_error.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
class file_mapper
{
public:
explicit file_mapper( const char* filename )
: file_mapper( file_opener( filename ) )
{
}
explicit file_mapper( const file_opener& reader )
: m_size( reader.size() ),
m_data( static_cast< const char* >(::mmap( nullptr, m_size, PROT_READ, MAP_PRIVATE, reader.m_fd, 0 ) ) )
{
if( m_size && ( intptr_t( m_data ) == -1 ) ) {
TAOCPP_PEGTL_THROW_INPUT_ERROR( "unable to mmap() file " << reader.m_source << " descriptor " << reader.m_fd );
}
}
~file_mapper() noexcept
{
::munmap( const_cast< char* >( m_data ), m_size ); // Legacy C interface requires pointer-to-mutable but does not write through the pointer.
}
file_mapper( const file_mapper& ) = delete;
void operator=( const file_mapper& ) = delete;
bool empty() const noexcept
{
return m_size == 0;
}
std::size_t size() const noexcept
{
return m_size;
}
using iterator = const char*;
using const_iterator = const char*;
iterator data() const noexcept
{
return m_data;
}
iterator begin() const noexcept
{
return m_data;
}
iterator end() const noexcept
{
return m_data + m_size;
}
std::string string() const
{
return std::string( m_data, m_size );
}
private:
const std::size_t m_size;
const char* const m_data;
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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