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Aryan 8f52549c19
Txt file fix (#35) 
* Fixed virtualization data indexing and improved text file to EPUB conversion logic.

- Corrected array indexing for `chunksData` and `chunkHeights` in `epub_reader.js` to prevent overwriting entire arrays.
- Refined virtualization intersection observer to properly restore and unload chunk content using index-based caching.
- Updated `SingleFileImporter.kt` to convert plain text into structured HTML paragraphs instead of a single `pre` tag.
- Enhanced CSS styles for imported single-file documents and added HTML entity escaping.

* Adjusted text layout and enhanced pagination mismatch logging

*   Configured `PlatformTextStyle` and `LineHeightStyle` to improve text measurement consistency.
*   Updated `checkLayoutMismatch` to include text snippets and handle zero expected height.
*   Refined `Modifier` application order in the reader view.
*   Ensured `maxHeight` is set to `Infinity` during text measurement in `Paginator`.
2026-03-06 14:06:29 +05:30
.github Update GitHub sponsor button with a username (#8) 2026-02-26 18:44:11 +05:30
app Txt file fix (#35) 2026-03-06 14:06:29 +05:30
docs docs: Revamp README and add APK naming convention (#2) 2026-02-25 19:54:43 +05:30
fastlane/metadata/android/en-US use HTML for fastlane full description (#15) 2026-02-27 21:59:10 +05:30
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.gitignore docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
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CLA.md docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
CONTRIBUTING.md Added stylus-only mode for PDF drawing and annotations. (#27) 2026-03-04 13:18:26 +05:30
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README.md

Episteme Reader Icon  Episteme Reader

A native Android document reader application built with Kotlin and Jetpack Compose.

Get it on Google Play

Episteme Reader Preview

Overview

Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.

Note: This is the Open Source (OSS) edition of Episteme Reader. The version available on the Google Play Store is built from this core but includes additional proprietary features.

Features

Supported Formats

  • Documents: PDF
  • E-books: EPUB, MOBI, AZW3
  • Text: MD, TXT, HTML

PDF Features

  • Viewing Modes: Vertical Scroll and Paginated view.
  • Ink Annotations: Draw directly on pages using Pen, Highlighter, and Eraser tools.
  • Text Annotations: Add text notes anywhere on the page using system or custom fonts.

E-Book Features

  • Parsing: Native parsing for MOBI/AZW3 via libmobi and EPUB via Jsoup.
  • Customization: Adjust font size, line spacing, and margins.
  • Custom Fonts: Support for importing user-provided font files (.ttf, .otf).

General

  • Text-to-Speech (TTS): Read documents aloud using the system TTS engine.
  • File Management: Built-in library organization.

Architecture

  • UI: 100% Jetpack Compose (Material3).
  • Architecture: MVVM with Unidirectional Data Flow.
  • Database: Room (SQLite) for metadata and annotations.
  • PDF Engine: pdfium-android (Native PDFium bindings).
  • EPUB Engine: Utilizes standard WebView for vertical scrolling mode, and a custom rendering engine for paginated mode.
  • Mobi Engine: Custom JNI bindings to libmobi.

Building from Source

  1. Clone the repository:

    git clone https://github.com/Aryan-Raj3112/episteme.git
cd episteme

  2. Build: Open in Android Studio and run the ossDebug variant.

    ./gradlew assembleOssDebug

Open Source Libraries

This project is made possible by the Android open-source ecosystem:

  • Core & UI: AndroidX, Jetpack Compose, Kotlinx Serialization
  • Document Engines: PdfiumAndroidKt (PDF), libmobi (MOBI/AZW3), Google WOFF2 (Fonts)
  • Parsers: Jsoup (HTML/EPUB), Flexmark (Markdown)
  • Media & Image Loading: Coil, Media3 (ExoPlayer)
  • Utilities: Room (Database), Timber (Logging)

License

This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). See the LICENSE file for details.