Tar Utility For Windows _top_ -

bool IsSparseFile(HANDLE h) DWORD bytes; FILE_ATTRIBUTE_TAG_INFO tag = 0; DeviceIoControl(h, FSCTL_GET_NTFS_FILE_RECORD, ...); return (tag.FileAttributes & FILE_ATTRIBUTE_SPARSE_FILE) != 0;

class FilterStream virtual size_t read(BYTE* buf, size_t len) = 0; virtual size_t write(BYTE* buf, size_t len) = 0; ; class GzipFilter : public FilterStream z_stream zs; // inflate/deflate with Z_SYNC_FLUSH ; tar utility for windows

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"); bool IsSparseFile(HANDLE h) DWORD bytes

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 : FILE_ATTRIBUTE_TAG_INFO tag = 0

On extraction, recreate ADS via CreateFile with filename:streamname . POSIX mode → NTFS conversion:

// Write file content if (!info.isDirectory) HANDLE h = CreateFileW(path.c_str(), GENERIC_READ, ...); WriteFileContent(h, info.size);