lnreader/modules/nitro-epub

Nitro EPUB

Cross-platform C++ EPUB support for LNReader, exposed through React Native Nitro Modules.

Capabilities

• Parse an extracted EPUB into novel metadata and chapter paths.
• Export downloaded chapter files as an EPUB 3 archive.
• Copy local chapter images into the archive and remove missing images.
• Generate EPUB navigation, NCX compatibility navigation, metadata, CSS, and optional JavaScript.
• Write the required mimetype entry first and without compression.
• Build exports on a Nitro worker thread and atomically publish the completed archive.
• Report completed chapter counts while an export is running.

The exporter accepts chapter file paths rather than chapter bodies so large novels do not need to be retained in the JavaScript heap.

Import the shared runtime object from the package:

import { epub } from 'nitro-epub'

const novel = await epub.parseNovelAndChapters(extractedDirectory)

Run pnpm specs in this directory after changing src/specs/Epub.nitro.ts. Generated Nitrogen sources are committed.