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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
#include <winapi/error.hpp>
#include <winapi/file.hpp>
#include <winapi/handle.hpp>
#include <winapi/utf8.hpp>
#include <cstring>
#include <string>
namespace winapi {
namespace {
struct CreateFileParams {
static CreateFileParams read() {
CreateFileParams params;
params.dwDesiredAccess = GENERIC_READ;
params.dwShareMode = FILE_SHARE_READ;
params.dwCreationDisposition = OPEN_EXISTING;
return params;
}
static CreateFileParams write() {
CreateFileParams params;
params.dwDesiredAccess = GENERIC_WRITE;
params.dwShareMode = FILE_SHARE_READ;
params.dwCreationDisposition = OPEN_ALWAYS;
return params;
}
DWORD dwDesiredAccess = 0;
DWORD dwShareMode = 0;
DWORD dwCreationDisposition = 0;
private:
CreateFileParams() = default;
};
Handle open_file(const std::string& path, const CreateFileParams& params) {
const auto unicode_path = LR"(\\?\)" + widen(path);
SECURITY_ATTRIBUTES attributes;
std::memset(&attributes, 0, sizeof(attributes));
attributes.nLength = sizeof(attributes);
attributes.bInheritHandle = TRUE;
const auto handle = ::CreateFileW(unicode_path.c_str(),
params.dwDesiredAccess,
params.dwShareMode,
&attributes,
params.dwCreationDisposition,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (handle == INVALID_HANDLE_VALUE) {
throw error::windows(GetLastError(), "CreateFileW");
}
return Handle{handle};
}
} // namespace
Handle File::open_for_reading(const std::string& path) {
return open_file(path, CreateFileParams::read());
}
Handle File::open_for_writing(const std::string& path) {
return open_file(path, CreateFileParams::write());
}
} // namespace winapi
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