agg_octet_string

[pyderasn.git] / pyderasn.py

diff --git a/pyderasn.py b/pyderasn.py
index fe1d4ab800624dfcb03307fe06b649f9ae259b3b..8d88a3b352a0fa9238718d54578cb5d742bb6043 100755 (executable)
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -816,6 +816,7 @@ except ImportError:  # pragma: no cover
 __version__ = "7.0"
 
 __all__ = (
+    "agg_octet_string",
     "Any",
     "BitString",
     "BMPString",
@@ -3554,6 +3555,29 @@ class OctetString(Obj):
             yield pp
 
 
+def agg_octet_string(evgens, decode_path, raw, writer):
+    """Aggregate constructed string (OctetString and its derivatives)
+
+    :param evgens: iterator of generated events
+    :param decode_path: points to the string we want to decode
+    :param raw: slicebable (memoryview, bytearray, etc) with
+                the data evgens are generated one
+    :param writer: buffer.write where string is going to be saved
+    """
+    decode_path_len = len(decode_path)
+    for dp, obj, _ in evgens:
+        if dp[:decode_path_len] != decode_path:
+            continue
+        if not obj.ber_encoded:
+            write_full(writer, raw[
+                obj.offset + obj.tlen + obj.llen:
+                obj.offset + obj.tlen + obj.llen + obj.vlen -
+                (EOC_LEN if obj.expl_lenindef else 0)
+            ])
+        if len(dp) == decode_path_len:
+            break
+
+
 NullState = namedtuple("NullState", BasicState._fields, **NAMEDTUPLE_KWARGS)