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#include <windows.h>
#include <iostream>
void usage(int argc, wchar_t** argv) {
std::wcout << L"Usage:\n"
<< L" " << argv[0] << L" filename age\n\n"
<< L" filename\n"
<< L" The path of the file to change.\n"
<< L" age\n"
<< L" The number of seconds in the past to set the file's \n"
<< L" modification time to.\n\n";
}
static const ULONGLONG FILETIME_TICKS_PER_SECOND = 10'000'000;
static ULARGE_INTEGER secondsAgoTimestamp(ULONGLONG secondsAgo) {
FILETIME now{};
GetSystemTimeAsFileTime(&now);
ULARGE_INTEGER systemTime;
systemTime.LowPart = now.dwLowDateTime;
systemTime.HighPart = now.dwHighDateTime;
systemTime.QuadPart -= secondsAgo * FILETIME_TICKS_PER_SECOND;
return systemTime;
}
int wmain(int argc, wchar_t** argv) {
HANDLE handle;
FILE_BASIC_INFO fileBasicInfo{};
long ageInSeconds;
if (argc != 3) {
usage(argc, argv);
return 1;
}
if (!swscanf(argv[2], L"%lu", &ageInSeconds)) {
std::wcout << "Invalid seconds: " << argv[2] << std::endl;
return 2;
}
if ((handle = CreateFileW(argv[1], GENERIC_WRITE, 0, nullptr, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL, nullptr)) ==
INVALID_HANDLE_VALUE) {
std::wcout << "Error opening file: " << argv[1] << ", " << GetLastError()
<< std::endl;
return 3;
}
if (!GetFileInformationByHandleEx(handle, FileBasicInfo, &fileBasicInfo,
sizeof(fileBasicInfo))) {
std::wcout << "Error getting file info: " << GetLastError() << std::endl;
return 4;
}
ULARGE_INTEGER desiredTimestamp = secondsAgoTimestamp(ageInSeconds);
fileBasicInfo.LastWriteTime.QuadPart = desiredTimestamp.QuadPart;
if (!SetFileInformationByHandle(handle, FileBasicInfo, &fileBasicInfo,
sizeof(fileBasicInfo))) {
std::wcout << "Error setting file mtime: " << GetLastError() << std::endl;
return 5;
}
if (!CloseHandle(handle)) {
std::wcout << "Error closing handle: " << GetLastError() << std::endl;
return 6;
}
return 0;
}
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