ROB: Cope with missing Standard 14 fonts in fields (#2677)

Closes #2670
Closes #2671

pypdf/_writer.py

@@ -52,7 +52,7 @@
  cast,
 )
 
-from ._cmap import build_char_map_from_dict
+from ._cmap import _default_fonts_space_width, build_char_map_from_dict
 from ._doc_common import PdfDocCommon
 from ._encryption import EncryptAlgorithm, Encryption
 from ._page import PageObject
@@ -824,7 +824,8 @@ def _update_field_annotation(
  ).get_object(),
  )
  dr = dr.get("/Font", DictionaryObject()).get_object()
- if font_name not in dr:
+ # _default_fonts_space_width keys is the list of Standard fonts
+ if font_name not in dr and font_name not in _default_fonts_space_width:
  # ...or AcroForm dictionary
  dr = cast(
  Dict[Any, Any],

tests/test_writer.py

@@ -2253,3 +2253,19 @@ def test_selfont():
  assert (
  b"Text_2" in writer.pages[0]["/Annots"][2].get_object()["/AP"]["/N"].get_data()
  )
+
+
+@pytest.mark.enable_socket()
+def test_no_ressource_for_14_std_fonts(caplog):
+ """Cf #2670"""
+ url = "https://github.com/py-pdf/pypdf/files/15405390/f1040.pdf"
+ name = "iss2670.pdf"
+ writer = PdfWriter(BytesIO(get_data_from_url(url, name=name)))
+ p = writer.pages[0]
+ for a in p["/Annots"]:
+ a = a.get_object()
+ if a["/FT"] == "/Tx":
+ writer.update_page_form_field_values(
+ p, {a["/T"]: "Brooks"}, auto_regenerate=False
+ )
+ assert "Font dictionary for /Helvetica not found." in caplog.text