libbbf-python: Bound Book Format (BBF) Tools & Python Bindings

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Project Overview

libbbf-python provides Python bindings and command-line tools for the Bound Book Format (BBF). The Bound Book Format is an archive format designed for digital books and comics. This package allows Python developers to programmatically create and read .bbf files, and provides convenient command-line utilities to convert between common archive formats (like CBZ/CBX) and BBF.

The core of libbbf-python is a pybind11 wrapper around the high-performance C++ libbbf library, ensuring speed and native integration.

Features

• libbbf Python Bindings: Access the full BBFBuilder (for creating BBF files) and BBFReader (for reading and extracting BBF files) functionality directly in Python.
• cbx2bbf Command-Line Tool: Convert one or more CBZ/CBX archives (or directories of images) into a single .bbf file. Supports advanced features like custom page ordering, section markers (chapters, volumes), and metadata.
• bbf2cbx Command-Line Tool: Extract the contents of a .bbf file back into a .cbz archive or an image directory. Supports integrity verification, section-specific extraction, and range extraction using keywords.
• High Performance: Leverages C++ for core operations (file I/O, hashing, memory mapping) for optimal speed.
• Integrity Checks: Built-in XXH3 hashing for robust data verification during creation and extraction.

Installation

You can install libbbf-python directly from PyPI:

pip install libbbf

Note on C++ Compiler: For platforms where pre-built binary wheels are not available (e.g., specific Linux distributions or older Python versions), pip will attempt to build the package from source. This requires a C++ compiler (like GCC/Clang on Linux/macOS or MSVC on Windows) to be installed on your system.

Command-Line Tools Usage

Once installed, two command-line tools will be available globally: cbx2bbf and bbf2cbx.

cbx2bbf: Create BBF Files from CBZ/Images

Usage:

cbx2bbf <inputs...> [options] --output <output.bbf>

Inputs: Can be individual image files (.png, .avif, .jpg), directories containing images, or .cbz/.cbx archives.

Options:

• --output <output.bbf>, -o <output.bbf>: Required. Specifies the output BBF filename.
• --order <path.txt>: Use a text file to define page order. Format: filename:index (e.g., cover.png:1, credits.png:-1 for last page).
• --sections <path.txt>: Use a text file to define multiple sections. Format: Name:Target[:Parent].
• --section "Name:Target[:Parent]": Add a single section marker. Target can be a 1-based page index or a filename. Example: --section "Chapter 1:001.png" or --section "Volume 1:my_comic.cbx:Series".
• --meta "Key:Value": Add archival metadata (e.g., --meta "Title:Akira").

Examples:

1. Basic Conversion:

   cbx2bbf my_comic.cbz -o output.bbf
   

2. Converting Multiple CBZs with Sections and Metadata:

   cbx2bbf vol1.cbz vol2.cbz \
       --section "Volume 1:vol1.cbz" \
       --section "Volume 2:vol2.cbz" \
       --meta "Title:My Awesome Series" \
       --meta "Author:Me" \
       -o series.bbf
   

   (Note: vol1.cbz and vol2.cbz as targets will automatically map to the first page of those archives after sorting)

3. Converting a Directory of Images with a Custom Order File:

   # pages.txt content:
   # cover.png:1
   # page001.png:2
   # ...
   # credits.png:-1
   
   cbx2bbf ./my_pages_folder/ --order pages.txt -o my_book.bbf
   

bbf2cbx: Extract BBF Files

Usage:

bbf2cbx <input.bbf> [options] --output <output.cbz_or_dir>

Options:

• --output <output_path>, -o <output_path>: Required. Output .cbz file or directory name.
• --dir: Extract to a directory instead of a .cbz archive.
• --section "Name": Extract only a specific section defined in the BBF.
• --rangekey "String": When extracting a section, find the end of extraction by matching this string against the next section's title. Useful for extracting "Vol 1" until "Vol 2" begins.
• --verify: Perform a full XXH3 integrity check on all assets and the directory hash before extraction.
• --info: Display book structure and metadata without extracting.

Examples:

1. Extract entire BBF to CBZ with Verification:

   bbf2cbx my_book.bbf -o my_book_extracted.cbz --verify
   

2. Extract a specific section to a folder:

   bbf2cbx series.bbf --section "Volume 1" --dir -o ./output/vol1/
   

3. Extract a range using rangekey:

   bbf2cbx series.bbf --section "Volume 1" --rangekey "Volume 2" -o vol1_only.cbz
   

4. Display BBF Information:

   bbf2cbx series.bbf --info
   

Using libbbf

You can also interface libbbf directly from python.

Example 1: Creating a .bbf file

from libbbf import BBFBuilder
import os

# Create a new Bound Book
builder = BBFBuilder("my_comic.bbf")

# Add Metadata
builder.add_metadata("Title", "Solo Leveling")
builder.add_metadata("Author", "Chugong")

# Add Pages (Assets are automatically deduplicated by hash!)
page_files = sorted(os.listdir("./chapter_images"))
for i, filename in enumerate(page_files):
    full_path = os.path.join("./chapter_images", filename)
    
    # Flags: 0 = Standard
    builder.add_page(full_path, type=1, flags=0) 

    # Define a Chapter every 20 pages
    if i % 20 == 0:
        builder.add_section(f"Chapter {i // 20 + 1}", start_page=i)

# Finalize writes the footer and optimized tables
builder.finalize()
print("BBF created successfully.")

Example 2: Verifying a .bbf file

import libbbf
import time

reader = libbbf.BBFReader("massive_archive.bbf")

print("Verifying file integrity...")
start = time.time()

# This releases the GIL, so it's thread-safe and incredibly fast
is_valid = reader.verify()

end = time.time()

if is_valid:
    print(f"SUCCESS: Integrity verified in {end - start:.4f}s")
else:
    print("ERROR: Corruption detected!")

Contributing

Contributions, issues, and feature requests are welcome! For libbbf, free to check the issues page (or create one if it doesn't exist yet).

License

This project is licensed under the MIT License - see the LICENSE file for details.