This repository provides safe, idiomatic Rust bindings to the MuPDF C library (Artifex Software), enabling programmatic reading, rendering, creation, and editing of PDF and other document formats. It is a library crate organized as a Cargo workspace with three sub-crates: `mupdf` (high-level API), `mupdf-sys` (FFI layer that compiles MuPDF from source), and optional font crates (`mupdf-fonts-droid`, `mupdf-fonts-noto`, `mupdf-fonts-sil`). The architecture is a classic FFI wrapper: `mupdf-sys` exposes raw C functions via `bindgen`, while `mupdf` provides safe Rust types (`Document`, `Page`, `Pixmap`, `PdfDocument`, `Shape`, etc.) with automatic resource management, error handling, and thread-safety checks. Key entry points include `Document::open()` for loading files, `Page::to_pixmap()` for rasterization, `Shape` for programmatic drawing, and `PdfDocument` for PDF-specific operations like annotation manipulation, form filling, and incremental saving. The library supports extensive feature flags (e.g., `js`, `xps`, `svg`, `tesseract`, `docx-output`) that control which MuPDF subsystems are compiled. The codebase demonstrates high craftsmanship through its safe wrapper patterns, builder-style APIs (e.g., `Shape`), extensible trait design (`FontLoader`, `NativeDevice`), and comprehensive test coverage including snapshot-based rendering tests and link extraction round-trip tests. It is not a data research project; it is a software library for document processing.
LibreraReader is a full-featured, multi-format e-book reader for Android (with an experimental iOS/desktop port via Kotlin Multiplatform). It supports PDF, EPUB, MOBI, DjVu, FB2, CBR/CBZ, DOC/DOCX, ODT, RTF, and many other formats through a combination of native C/C++ libraries (MuPDF, DjVuLibre, libmobi, libantiword, libwebp, liblame) and Java-based document translators (ODF/SVM/WMF to HTML/SVG). The app provides a rich reading experience with customizable themes, text-to-speech, OPDS catalog browsing, cloud sync (Google Drive, Dropbox), annotations, bookmarks, and a smart reflow feature for scanned documents. The codebase is large and monolithic, with significant third-party code vendored into the source tree. Development has been frozen (as noted in the README), so the project is in a maintenance-only state. Despite its age and complexity, it contains several well-crafted, reusable utility libraries (e.g., LWXML streaming XML framework, SVM-to-SVG translator, and general-purpose Android utilities) that could be extracted for other projects.