page.widgets() crashes on XFA forms

[yurivict]

Description of the bug

Testcase: f1040.pdf.

script:

import pymupdf

# Open the PDF file
doc = pymupdf.open("f1040.pdf")

for page in doc:
    print(f"--- Page {page.number} ---")
    # Iterate over all form fields (widgets) on the page
    for field in page.widgets():
        # Access field properties
        name = field.field_name       # The internal name of the field
        value = field.field_value     # The data currently in the field
        f_type = field.field_type      # Integer representing the field type
        
        print(f"Field Name: {name}")
        print(f"Field Value: {value}")
        print(f"Field Type: {f_type}")
        print("-" * 20)

doc.close()

How to reproduce the bug

see above

PyMuPDF version

1.27.2.2

Operating system

Other

Python version

3.11

[julian-smith-artifex-com]

Thanks for reporting the bug and for providing the reproducer, which i've converted into a test in my tree.

However for me the new test passes fine with no crash on linux-x64-python3.13 and macos-arm64-python3.11+3.14, all with current release pymupdf-1.27.2.2 from pypi.org.

[As a check, the test shows 128 widgets on page 0 and 71 widgets on page 1.]

[yurivict]

For me it crashes with the assertion: assert(__n < v.size()) when both __n and v.size() are 0.
Can it be the case that assertions are not present in your build?
Did you try the debug build with assertions?

[julian-smith-artifex-com]

You'll need to provide more information.

There are no occurrences of the word __n in pymupdf or mupdf, so i do not know what assertion you mean.

This original report say it happens with 1.27.2.2, which i assumed was a wheel from the current release on pypi.org.

If you're instead building mupdf and pymupdf yourself, please give full details about your OS and also give the exact build command(s) that were used.