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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/path.hpp>
#include <winapi/utf8.hpp>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <stdexcept>
#include <string>
namespace winapi {
namespace {
std::wstring to_system_path(const std::string& path) {
return widen(path);
}
std::wstring to_system_path(const CanonicalPath& path) {
return widen(R"(\\?\)" + path.get());
}
struct CreateFileParams {
static CreateFileParams read() {
CreateFileParams params;
params.dwDesiredAccess = GENERIC_READ;
params.dwShareMode = FILE_SHARE_READ;
params.dwCreationDisposition = OPEN_EXISTING;
return params;
}
static CreateFileParams read_attributes() {
auto params = read();
params.dwDesiredAccess = FILE_READ_ATTRIBUTES;
params.dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
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;
};
File open_file(const std::wstring& path, const CreateFileParams& params) {
SECURITY_ATTRIBUTES attributes;
std::memset(&attributes, 0, sizeof(attributes));
attributes.nLength = sizeof(attributes);
attributes.bInheritHandle = TRUE;
const auto handle = ::CreateFileW(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 File{Handle{handle}};
}
void remove_file(const std::wstring& path) {
const auto ret = ::DeleteFileW(path.c_str());
if (!ret) {
throw error::windows(GetLastError(), "DeleteFileW");
}
}
} // namespace
File File::open_r(const std::string& path) {
return open_file(to_system_path(path), CreateFileParams::read());
}
File File::open_r(const CanonicalPath& path) {
return open_file(to_system_path(path), CreateFileParams::read());
}
File File::open_read_attributes(const std::string& path) {
return open_file(to_system_path(path), CreateFileParams::read_attributes());
}
File File::open_read_attributes(const CanonicalPath& path) {
return open_file(to_system_path(path), CreateFileParams::read_attributes());
}
File File::open_w(const std::string& path) {
return open_file(to_system_path(path), CreateFileParams::write());
}
File File::open_w(const CanonicalPath& path) {
return open_file(to_system_path(path), CreateFileParams::write());
}
void File::remove(const std::string& path) {
remove_file(to_system_path(path));
}
void File::remove(const CanonicalPath& path) {
remove_file(to_system_path(path));
}
std::size_t File::get_size() const {
LARGE_INTEGER size;
if (!GetFileSizeEx(get(), &size))
throw error::windows(GetLastError(), "GetFileSizeEx");
if (size.QuadPart < 0 || size.QuadPart > SIZE_MAX)
throw std::runtime_error{"invalid file size"};
return static_cast<std::size_t>(size.QuadPart);
}
bool operator==(const FILE_ID_128& a, const FILE_ID_128& b) {
return 0 == std::memcmp(a.Identifier, b.Identifier, sizeof(a.Identifier));
}
File::ID File::query_id() const {
FILE_ID_INFO id;
if (!GetFileInformationByHandleEx(get(), FileIdInfo, &id, sizeof(id)))
throw error::windows(GetLastError(), "GetFileInformationByHandleEx");
return {id};
}
} // namespace winapi
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