BUG: catch the case where w[0] is an IndirectObject instead of an int (…

…#2154)

Closes #2137

pypdf/_cmap.py

@@ -410,7 +410,7 @@ def compute_space_width(
  else:
  w = []
  while len(w) > 0:
- st = w[0]
+ st = w[0] if isinstance(w[0], int) else w[0].get_object()
  second = w[1].get_object()
  if isinstance(second, int):
  for x in range(st, second):

tests/test_cmap.py

@@ -191,6 +191,18 @@ def test_unixxx_glyphs():
  assert pat in txt
 
 
+@pytest.mark.enable_socket()
+def test_cmap_compute_space_width():
+ # issue 2137
+ # original file URL:
+ url = "https://arxiv.org/pdf/2005.05909.pdf"
+ # URL from github issue is too long to pass code stype check, use original arxiv URL instead
+ # url = "https://github.com/py-pdf/pypdf/files/12489914/Morris.et.al.-.2020.-.TextAttack.A.Framework.for.Adversarial.Attacks.Data.Augmentation.and.Adversarial.Training.in.NLP.pdf"
+ name = "TextAttack_paper.pdf"
+ reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+ reader.pages[0].extract_text() # no error
+
+
 @pytest.mark.enable_socket()
 def test_tabs_in_cmap():
  """Issue #2173"""