STY: Add form feed to WHITESPACES (#3054)

Table 1—White-space characters; ISO 32000-2:2020 (PDF 2.0).

Author: j-t-1

pypdf/_utils.py

@@ -124,7 +124,7 @@ def _get_max_pdf_version_header(header1: str, header2: str) -> str:
     return versions[max(pdf_header_indices)]
 
 
-WHITESPACES = (b" ", b"\n", b"\r", b"\t", b"\x00")
+WHITESPACES = (b"\x00", b"\t", b"\n", b"\f", b"\r", b" ")
 WHITESPACES_AS_BYTES = b"".join(WHITESPACES)
 WHITESPACES_AS_REGEXP = b"[" + WHITESPACES_AS_BYTES + b"]"
 

tests/test_utils.py

@@ -43,6 +43,7 @@
         (io.BytesIO(b"  "), True),
         (io.BytesIO(b"  \n"), True),
         (io.BytesIO(b"    \n"), True),
+        (io.BytesIO(b"\f"), True),
     ],
 )
 def test_skip_over_whitespace(stream, expected):
@@ -60,6 +61,7 @@ def test_skip_over_whitespace(stream, expected):
         (b"  ", True),
         (b"  \n", True),
         (b"    \n", True),
+        (b"\f", True),
     ],
 )
 def test_check_if_whitespace_only(value, expected):