Simplified approach: Store mode in pax extended header, apply best effort on Windows (ignore group/other bits, map owner read/write to deny/allow ACL entries). Detect sparse files on Windows via FSCTL_QUERY_ALLOCATED_RANGES :
if (hdr.typeflag == '0' Use streaming architecture to avoid loading entire archive into memory: tar utility for windows
On extraction, recreate ADS via CreateFile with filename:streamname . POSIX mode → NTFS conversion: Simplified approach: Store mode in pax extended header,
return true;
void TarWriter::addADS(const std::wstring& path) std::wstring streamPath = path + L":Zone.Identifier"; HANDLE h = CreateFileW(streamPath.c_str(), GENERIC_READ, ...); if (h != INVALID_HANDLE_VALUE) // Store as separate entry with name "path:Zone.Identifier" addFile(streamPath, ToUtf8(path) + ":Zone.Identifier"); HANDLE h = CreateFileW(streamPath.c_str()