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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#if defined(_WIN32) && defined(_MSC_VER)
#include <fstream>
#include "mongo/base/string_data.h"
namespace mongo {
// Helper class to open a FILE* with shared access. Used by the stream classes below.
class Win32SharedAccessFileDescriptor {
protected:
Win32SharedAccessFileDescriptor(const wchar_t* filename,
std::ios_base::openmode mode,
bool sharedWriteAccess);
Win32SharedAccessFileDescriptor(const char* filename,
std::ios_base::openmode mode,
bool sharedWriteAccess);
Win32SharedAccessFileDescriptor(const std::string& filename,
std::ios_base::openmode mode,
bool sharedWriteAccess);
Win32SharedAccessFileDescriptor(const std::filesystem::path& filename,
std::ios_base::openmode mode,
bool sharedWriteAccess);
static FILE* _open(const wchar_t* filename,
std::ios_base::openmode mode,
bool sharedWriteAccess);
static FILE* _open(StringData filename, std::ios_base::openmode mode, bool sharedWriteAccess);
FILE* _file = nullptr;
};
// File stream classes that extends the regular file streams with two capabilities:
// (1) Opens files with shared delete and read access with optional shared write access.
// (2) Uses UTF-8 as the encoding for the filename parameter
class Win32SharedAccessOfstream : private Win32SharedAccessFileDescriptor, public std::ofstream {
public:
explicit Win32SharedAccessOfstream(const char* filename,
ios_base::openmode mode = ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessOfstream(const wchar_t* filename,
ios_base::openmode mode = ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessOfstream(const std::string& filename,
ios_base::openmode mode = ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessOfstream(const std::filesystem::path& filename,
ios_base::openmode mode = ios_base::out,
bool sharedWriteAccess = false);
// The Visual Studio extension that operates on FILE* does not have an open overload. Needs to
// open with constructor.
void open(const char* filename, ios_base::openmode mode) = delete;
void open(const wchar_t* filename, ios_base::openmode mode) = delete;
void open(const std::string& filename, ios_base::openmode mode) = delete;
void open(const std::filesystem::path& filename, ios_base::openmode mode) = delete;
};
class Win32SharedAccessIfstream : private Win32SharedAccessFileDescriptor, public std::ifstream {
public:
explicit Win32SharedAccessIfstream(const char* filename,
ios_base::openmode mode = ios_base::in,
bool sharedWriteAccess = false);
explicit Win32SharedAccessIfstream(const wchar_t* filename,
ios_base::openmode mode = ios_base::in,
bool sharedWriteAccess = false);
explicit Win32SharedAccessIfstream(const std::string& filename,
ios_base::openmode mode = ios_base::in,
bool sharedWriteAccess = false);
explicit Win32SharedAccessIfstream(const std::filesystem::path& filename,
ios_base::openmode mode = ios_base::in,
bool sharedWriteAccess = false);
// The Visual Studio extension that operates on FILE* does not have an open overload. Needs to
// open with constructor.
void open(const char* filename, ios_base::openmode mode) = delete;
void open(const wchar_t* filename, ios_base::openmode mode) = delete;
void open(const std::string& filename, ios_base::openmode mode) = delete;
void open(const std::filesystem::path& filename, ios_base::openmode mode) = delete;
};
class Win32SharedAccessFstream : private Win32SharedAccessFileDescriptor, public std::fstream {
public:
explicit Win32SharedAccessFstream(const char* filename,
ios_base::openmode mode = ios_base::in | ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessFstream(const wchar_t* filename,
ios_base::openmode mode = ios_base::in | ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessFstream(const std::string& filename,
ios_base::openmode mode = ios_base::in | ios_base::out,
bool sharedWriteAccess = false);
explicit Win32SharedAccessFstream(const std::filesystem::path& filename,
ios_base::openmode mode = ios_base::in | ios_base::out,
bool sharedWriteAccess = false);
// The Visual Studio extension that operates on FILE* does not have an open overload. Needs to
// open with constructor.
void open(const char* filename, ios_base::openmode mode) = delete;
void open(const wchar_t* filename, ios_base::openmode mode) = delete;
void open(const std::string& filename, ios_base::openmode mode) = delete;
void open(const std::filesystem::path& filename, ios_base::openmode mode) = delete;
};
} // namespace mongo
#endif // _WIN32
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