114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
#if defined(_MSC_VER)
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#include "filetime.h"
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#include <Windows.h>
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#include <stdexcept>
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namespace cpputils {
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namespace {
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FILETIME to_filetime(timespec value) {
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ULARGE_INTEGER ull;
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ull.QuadPart = (value.tv_sec * 10000000ULL) + 116444736000000000ULL + (value.tv_nsec / 100);
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FILETIME result;
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result.dwLowDateTime = ull.LowPart;
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result.dwHighDateTime = ull.HighPart;
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return result;
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}
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timespec to_timespec(FILETIME value) {
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// function taken from https://github.com/wishstudio/flinux/blob/afbb7d7509d4f1e0fdd62bf02124e7c4ce20ca6d/src/datetime.c under GPLv3
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constexpr uint64_t NANOSECONDS_PER_TICK = 100ULL;
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constexpr uint64_t NANOSECONDS_PER_SECOND = 1000000000ULL;
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constexpr uint64_t TICKS_PER_SECOND = 10000000ULL;
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constexpr uint64_t SEC_TO_UNIX_EPOCH = 11644473600ULL;
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constexpr uint64_t TICKS_TO_UNIX_EPOCH = TICKS_PER_SECOND * SEC_TO_UNIX_EPOCH;
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uint64_t ticks = ((uint64_t)value.dwHighDateTime << 32ULL) + value.dwLowDateTime;
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uint64_t nsec = 0;
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if (ticks >= TICKS_TO_UNIX_EPOCH) { // otherwise out of range
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ticks -= TICKS_TO_UNIX_EPOCH;
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nsec = ticks * NANOSECONDS_PER_TICK;
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}
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timespec result;
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result.tv_sec = nsec / NANOSECONDS_PER_SECOND;
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result.tv_nsec = nsec % NANOSECONDS_PER_SECOND;
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return result;
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}
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struct OpenFileRAII final {
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HANDLE handle;
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OpenFileRAII(const char* filepath, DWORD access)
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:handle(CreateFileA(filepath, access, 0, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr)) {
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}
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BOOL close() {
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if (INVALID_HANDLE_VALUE == handle) {
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return 1;
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}
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BOOL success = CloseHandle(handle);
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handle = INVALID_HANDLE_VALUE;
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return success;
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}
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~OpenFileRAII() {
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close();
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}
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};
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}
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int set_filetime(const char *filepath, timespec lastAccessTime, timespec lastModificationTime) {
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OpenFileRAII file(filepath, FILE_WRITE_ATTRIBUTES);
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if (INVALID_HANDLE_VALUE == file.handle) {
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return GetLastError();
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}
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FILETIME atime = to_filetime(lastAccessTime);
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FILETIME mtime = to_filetime(lastModificationTime);
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BOOL success = SetFileTime(file.handle, nullptr, &atime, &mtime);
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if (!success) {
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return GetLastError();
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}
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success = file.close();
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if (!success) {
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return GetLastError();
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}
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return 0;
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}
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int get_filetime(const char *filepath, timespec* lastAccessTime, timespec* lastModificationTime) {
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OpenFileRAII file(filepath, FILE_READ_ATTRIBUTES);
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if (INVALID_HANDLE_VALUE == file.handle) {
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return GetLastError();
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}
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FILETIME atime;
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FILETIME mtime;
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BOOL success = GetFileTime(file.handle, nullptr, &atime, &mtime);
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if (!success) {
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return GetLastError();
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}
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success = file.close();
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if (!success) {
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return GetLastError();
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}
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*lastAccessTime = to_timespec(atime);
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*lastModificationTime = to_timespec(mtime);
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return 0;
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}
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}
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#endif
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