ValueError: Ascii85 encoded byte sequences must end with b'~>' #2996
Description
Error extracting text from document
Environment
Which environment were you using when you encountered the problem?
$ python -m platform
Windows-11-10.0.22631-SP0
$ python -c "import pypdf;print(pypdf._debug_versions)"
pypdf==5.1.0, crypt_provider=('local_crypt_fallback', '0.0.0'), PIL=11.0.0Code + PDF
This is a minimal, complete example that shows the issue:
for page_num in range_of_pages:
page = pdf_reader.pages[page_num]
page_text = page.extract_text()
page_text = page_text.strip()
if not page_text:
page_num_without_text.append(page_num + 1)
page_texts.append(page_text)Share here the PDF file(s) that cause the issue. The smaller they are, the
better. Let us know if we may add them to our tests!
1af7d56a-5c8c-4914-85b3-b2536a5525cd.pdf
Traceback
This is the complete traceback I see:
File "common\fast_pdf_util.py", line 138, in get_pdf_info
page_text = page.extract_text()
^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_page.py", line 2398, in extract_text
return self._extract_text(
^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_page.py", line 1868, in _extract_text
cmaps[f] = build_char_map(f, space_width, obj)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\git\pi-embedding\venv\Lib\site-packages\pypdf\_cmap.py", line 33, in build_char_map
font_subtype, font_halfspace, font_encoding, font_map = build_char_map_from_dict(
^^^^^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_cmap.py", line 56, in build_char_map_from_dict
encoding, map_dict = get_encoding(ft)
^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_cmap.py", line 129, in get_encoding
map_dict, int_entry = _parse_to_unicode(ft)
^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_cmap.py", line 220, in _parse_to_unicode
cm = prepare_cm(ft)
^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\_cmap.py", line 250, in prepare_cm
cm = cast(DecodedStreamObject, ft["/ToUnicode"]).get_data()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\git\pi-embedding\venv\Lib\site-packages\pypdf\generic\_data_structures.py", line 1113, in get_data
decoded.set_data(decode_stream_data(self))
^^^^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\filters.py", line 638, in decode_stream_data
data = ASCII85Decode.decode(data)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pypdf\filters.py", line 449, in decode
return a85decode(data, adobe=True, ignorechars=WHITESPACES_AS_BYTES)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "Python312\Lib\base64.py", line 388, in a85decode
raise ValueError(
ValueError: Ascii85 encoded byte sequences must end with b'~>'
Workaround to get past error
diff --git a/pypdf/filters.py b/pypdf/filters.py
index 517d6aa..5ea158d 100644
--- a/pypdf/filters.py
+++ b/pypdf/filters.py
@@ -635,7 +635,11 @@ def decode_stream_data(stream: Any) -> bytes: # utils.StreamObject
elif filter_type in (FT.LZW_DECODE, FTA.LZW):
data = LZWDecode._decodeb(data, params)
elif filter_type in (FT.ASCII_85_DECODE, FTA.A85):
- data = ASCII85Decode.decode(data)
+ try:
+ data = ASCII85Decode.decode(data)
+ except ValueError:
+ # ignore the error for now as workaround
+ pass
elif filter_type == FT.DCT_DECODE:
data = DCTDecode.decode(data)
elif filter_type == FT.JPX_DECODE: