BUG : incomplete Graphic State save/restore(py-pdf#1142)

Graphic state shall store also the font, font size,....

PyPDF2/_page.py

@@ -1133,8 +1133,10 @@ def _extract_text(
  if "/Font" in resources_dict:
  for f in cast(DictionaryObject, resources_dict["/Font"]):
  cmaps[f] = build_char_map(f, space_width, obj)
- cmap: Tuple[
- Union[str, Dict[int, str]], Dict[str, str], str
+ cmap: Tuple[Union[str, Dict[int, str]], Dict[str, str], str] = [
+ "charmap",
+ {},
+ "NotInitialized",
  ] # (encoding,CMAP,font_name)
  try:
  content = (
@@ -1211,10 +1213,28 @@ def process_operation(operator: bytes, operands: List) -> None:
  # table 4.7, page 219
  # cm_matrix calculation is a reserved for the moment
  elif operator == b"q":
- cm_stack.append(cm_matrix)
+ cm_stack.append(
+ (
+ cm_matrix,
+ cmap,
+ font_size,
+ char_scale,
+ space_scale,
+ _space_width,
+ TL,
+ )
+ )
  elif operator == b"Q":
  try:
- cm_matrix = cm_stack.pop()
+ (
+ cm_matrix,
+ cmap,
+ font_size,
+ char_scale,
+ space_scale,
+ _space_width,
+ TL,
+ ) = cm_stack.pop()
  except Exception:
  cm_matrix = [1.0, 0.0, 0.0, 1.0, 0.0, 0.0]
  elif operator == b"cm":

tests/test_page.py

@@ -238,6 +238,15 @@ def test_extract_text_single_quote_op():
  page.extract_text()
 
 
+def test_iss_1142():
+ # check fix for problem of context save/restore (q/Q)
+ url = "https://github.com/py-pdf/PyPDF2/files/9150656/ST.2019.PDF"
+ name = "st2019.pdf"
+ reader = PdfReader(BytesIO(get_pdf_from_url(url, name=name)))
+ txt = reader.pages[3].extract_text()
+ assert txt.find("有限公司郑州分公司") > 0
+
+
 @pytest.mark.parametrize(
  ("url", "name"),
  [