nissl-lab/npoi

This system is a comprehensive .NET library for reading, writing, and manipulating Microsoft Office file formats, including Excel (HSSF/XSSF), Word (HWPF/XWPF), and PowerPoint (HSLF). It provides low-level binary and XML parsing capabilities for legacy and modern Office documents, alongside high-level user models for creating and modifying spreadsheets, documents, and presentations. The library also supports advanced features such as formula evaluation, chart generation, encryption/decryption, and text extraction.

This period focused on significantly expanding the library's capabilities for handling complex binary formats and spreadsheet formulas. The team added support for encrypted OLE2 and HSSF files, implemented extensive HPSF and DDF parsing, and introduced a robust formula evaluation engine with numerous built-in functions. Additionally, the codebase was modernized to support newer .NET versions and included comprehensive test coverage for these new features.

98 changes

This period focused on significantly expanding support for OOXML (XSSF) and Word (XWPF) formats, introducing new model classes, extractors, and styling capabilities. The team also standardized the development environment and added comprehensive test coverage for these new features alongside legacy HSSF and POIFS components.

57 changes

This period focused on significantly expanding OpenXML format support by adding comprehensive classes for drawing, charts, and spreadsheet elements, alongside implementing the Open Packaging Convention layer. It also introduced robust encryption capabilities, including Agile and Standard schemes, and added VBA macro extraction features.

59 changes

nissl-lab/npoi was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.