libcruft-util/io_win32.cpp

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/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2014 Danny Robson <danny@nerdcruft.net>
*/
#include "io_win32.hpp"
#include "debug.hpp"
#include "except.hpp"
#include <windows.h>
using util::detail::win32::mapped_file;
//-----------------------------------------------------------------------------
static DWORD
access_to_flags (util::access_t a) {
switch (a) {
case util::ACCESS_READ:
return GENERIC_READ;
case util::ACCESS_WRITE:
return GENERIC_WRITE;
default:
unreachable ();
}
}
//-----------------------------------------------------------------------------
mapped_file::mapped_file (const boost::filesystem::path &path,
access_t access):
m_data (nullptr, UnmapViewOfFile)
{
std::cerr << "mapped_file\n";
m_file.reset (CreateFile (path.string ().c_str (),
access_to_flags (access),
access == ACCESS_READ ? FILE_SHARE_READ : 0,
nullptr,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,
0));
if (m_file == INVALID_HANDLE_VALUE)
win32_error::throw_code ();
std::cerr << "mapped_file: file\n";
m_mapping.reset (CreateFileMapping (m_file,
nullptr,
access == ACCESS_READ ? PAGE_READONLY : PAGE_READWRITE,
0, 0,
nullptr));
if (m_mapping == INVALID_HANDLE_VALUE)
win32_error::throw_code ();
std::cerr << "mapped_file: mapping\n";
auto view = MapViewOfFile (m_mapping,
access == ACCESS_READ ? FILE_MAP_READ : FILE_MAP_WRITE,
0, 0,
0);
if (view == nullptr)
win32_error::throw_code ();
std::cerr << "mapped_file: view\n";
m_data.reset (
static_cast<unsigned char*> (view)
);
m_size = GetFileSize (m_file, nullptr);
std::cout << "size: " << m_size << '\n';
}
//-----------------------------------------------------------------------------
const uint8_t*
mapped_file::data (void) const
{
return m_data.get ();
}
uint8_t*
mapped_file::data (void)
{
return m_data.get ();
}
size_t
mapped_file::size (void) const
{
return m_size;
}
uint8_t*
mapped_file::begin (void)
{
return data ();
}
uint8_t*
mapped_file::end (void)
{
return data () + size ();
}
const uint8_t*
mapped_file::cbegin (void) const
{
return data ();
}
const uint8_t*
mapped_file::cend (void) const
{
return data () + size ();
}
//-----------------------------------------------------------------------------
util::handle_ref::handle_ref ():
handle (INVALID_HANDLE_VALUE)
{ ; }
util::handle_ref::~handle_ref ()
{
reset (INVALID_HANDLE_VALUE);
}
void
util::handle_ref::reset (HANDLE _handle)
{
if (handle != INVALID_HANDLE_VALUE)
if (!CloseHandle (handle))
win32_error::throw_code ();
handle = _handle;
}
util::handle_ref::operator HANDLE (void) const
{
return handle;
}