ROB: Decode all stream filters with short DecodeParms

pypdf/filters.py

@@ -830,9 +830,10 @@ def decode_stream_data(stream: StreamObject) -> bytes:
     # If there is no data to decode, we should not try to decode it.
     if not data:
         return data
-    for filter_name, params in zip(filters, decode_parms):
+    for i, filter_name in enumerate(filters):
+        params = decode_parms[i] if i < len(decode_parms) else DictionaryObject()
         if isinstance(params, NullObject):
-            params = {}
+            params = DictionaryObject()
         if filter_name in (FT.ASCII_HEX_DECODE, FTA.AHx):
             _deprecate_inline_image_filters(filter_name=filter_name, old_name=FTA.AHx, new_name=FT.ASCII_HEX_DECODE)
             data = ASCIIHexDecode.decode(data)

tests/test_filters.py

@@ -1095,6 +1095,28 @@ def test_runlengthdecode__decode_limit():
         assert RunLengthDecode.decode(encoded) == b"A" * uncompressed_size
 
 
+@pytest.mark.parametrize(
+    "decode_parms",
+    [
+        None,
+        ArrayObject([DictionaryObject(), DictionaryObject()]),
+        ArrayObject([DictionaryObject()]),
+        ArrayObject([]),
+    ],
+)
+def test_decode_stream_data__short_decode_parms_array(decode_parms):
+    data = b"Hello World!"
+    stream = StreamObject()
+    stream._data = zlib.compress(data).hex().encode("ascii") + b">"
+    stream[NameObject("/Filter")] = ArrayObject(
+        [NameObject("/ASCIIHexDecode"), NameObject("/FlateDecode")]
+    )
+    if decode_parms is not None:
+        stream[NameObject("/DecodeParms")] = decode_parms
+
+    assert decode_stream_data(stream) == data
+
+
 @pytest.mark.timeout(10)
 def test_asciihexdecode__speed():
     encoded = (b"41" * 1_200_000) + b">"