Font Pack Extractor

A tool for extracting and repacking PNG font files from .fnt format in DOKAPON! Sword of Fury.

Table of contents

  1. Overview
  2. Requirements
  3. Installation
  4. Usage
    1. Extracting PNG from FNT
    2. Importing PNG to FNT
  5. Output Format
  6. Troubleshooting
    1. Common Issues
    2. Size Warnings
  7. Technical Details
    1. FNT File Structure
      1. Data Section (0x000 - EOF)
    2. Extraction Process
    3. Memory Considerations
  8. Contributing
  9. License

Overview

Font Pack Extractor is a Python script that allows you to:

  • Extract PNG files from the game’s proprietary .fnt format
  • Repack modified PNG files back into .fnt format
  • Analyze font file structure for modding purposes

Requirements

  • Python 3.6 or higher
  • DOKAPON! Sword of Fury (PC Version) installed
  • Basic knowledge of using command line tools

Installation

  1. Download the font_extract_repack.py script
  2. Place it in the same directory as your .fnt files (usually in the game’s installation directory)

Usage

Extracting PNG from FNT

python font_extract_repack.py extract input.fnt output.png

Importing PNG to FNT

python font_extract_repack.py import original.fnt modified.png output.fnt

The script will:

  1. Validate the input FNT file
  2. Extract/Import PNG data
  3. Maintain original file format integrity

Output Format

The extracted files will be:

  • Format: PNG
  • Original quality preserved
  • Original image parameters maintained

You can edit the extracted PNG files using any image editing software.

Troubleshooting

Common Issues

  1. File Not Found Error
    Error: Could not find file at [path]/file.fnt
    • Make sure the script is in the same directory as your .fnt files
    • Verify the file name is exact
  2. Invalid Format Error
    No embedded PNG data found in the .fnt file
    • Ensure you’re using a valid .fnt file from the game
    • Check if the file isn’t corrupted

Size Warnings

When importing a modified PNG:

  • If the new file is smaller, padding will be added
  • If larger, it will be truncated to match the original size

Technical Details

FNT File Structure

The .fnt file format is a proprietary format used in DOKAPON! Sword of Fury to store font data:

Data Section (0x000 - EOF)

  • Embedded PNG data
  • Standard PNG signature
  • Standard PNG ending

Extraction Process

  1. File Validation
    if start_index != -1 and end_index != -1:
    png_data = fnt_data[start_index:end_index]
  2. PNG Processing
    # Extract PNG data
with open(output_png_path, 'wb') as png_file:
    png_file.write(png_data)

Memory Considerations

  • Files are processed in streams
  • Direct PNG extraction without conversion
  • Efficient handling of large files

Contributing

Found a bug or want to improve the tool?

  • Report issues on GitHub
  • Submit pull requests with improvements
  • Share your findings on our Discord

License

This tool is licensed under The Unlicense. This means:

  • ✅ Use freely for any purpose
  • ✅ Modify and distribute without restrictions
  • ✅ No attribution required
  • ✅ Dedicated to public domain
  • ✅ No warranty provided

See the LICENSE file for full details.