fix(handler): improve tar handler to support sparse archives.

unblob/handlers/archive/_safe_tarfile.py

@@ -1,6 +1,14 @@
 import os
 import tarfile
 from pathlib import Path
+from tarfile import (
+    GNUTYPE_LONGLINK,
+    GNUTYPE_LONGNAME,
+    GNUTYPE_SPARSE,
+    SOLARIS_XHDTYPE,
+    XGLTYPE,
+    XHDTYPE,
+)
 
 from structlog import get_logger
 
@@ -143,3 +151,19 @@ def record_problem(self, tarinfo, problem, resolution):
                 resolution=resolution,
             )
         )
+
+
+def _proc_member(self, tarfile):
+    if self.type in (GNUTYPE_LONGNAME, GNUTYPE_LONGLINK):
+        return self._proc_gnulong(tarfile)
+    if self.type == GNUTYPE_SPARSE:
+        orig_size = self.size
+        self = self._proc_sparse(tarfile)
+        self.size = orig_size
+        return self
+    if self.type in (XHDTYPE, XGLTYPE, SOLARIS_XHDTYPE):
+        return self._proc_pax(tarfile)
+    return self._proc_builtin(tarfile)
+
+
+tarfile.TarInfo._proc_member = _proc_member  # type: ignore # noqa: SLF001