From 2e69836e7795b1ed8c5772fe9bcf248f9b9e0671 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Fri, 27 Sep 2024 19:19:41 +0200
Subject: [PATCH] BUG: Cope with unbalanced delimiters in dictionary object
 (#2878)

Closes #2877.
---
 pypdf/generic/_data_structures.py | 2 ++
 tests/test_reader.py              | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/pypdf/generic/_data_structures.py b/pypdf/generic/_data_structures.py
index 2a004c15b..58a3477fa 100644
--- a/pypdf/generic/_data_structures.py
+++ b/pypdf/generic/_data_structures.py
@@ -570,6 +570,8 @@ def read_unsized_from_stream(
             try:
                 try:
                     key = read_object(stream, pdf)
+                    if isinstance(key, NullObject):
+                        break
                     if not isinstance(key, NameObject):
                         raise PdfReadError(
                             f"Expecting a NameObject for key but found {key!r}"
diff --git a/tests/test_reader.py b/tests/test_reader.py
index 9fb898ab0..30da20adb 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -1703,3 +1703,12 @@ def test_space_in_names_to_continue_processing(caplog):
     reader = PdfReader(BytesIO(b), strict=True)
     with pytest.raises(PdfReadError):
         obj = reader.get_object(70)
+
+
+@pytest.mark.enable_socket()
+def test_unbalanced_brackets_in_dictionary_object(caplog):
+    """Cf #2877"""
+    url = "https://github.com/user-attachments/files/17162634/7f40cb209fb97d1782bffcefc5e7be40.pdf"
+    name = "iss2877.pdf"  # reused
+    reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+    assert len(reader.pages) == 43  # note:  /Count = 46 but 3 kids are None