Wiithon

A Python library for reading, extracting, and rebuilding Nintendo Wii ISO files.

Features

• Parse and extract files from standard Wii ISOs.
• Read the Wii File System Table (FST) and reconstruct the directory tree.
• On-the-fly decryption and encryption of Wii data clusters.
• Rebuild and master new Wii ISOs from extracted or modified files.
• Hash calculation and Merkle tree generation for partition integrity. (doesn't work great atm)

Documentation

For comprehensive guides, internal architecture details, and references, please refer to the docs/ directory.

Examples

For some examples, you can refer to the examples/ directory.

Overview

The library is divided into two main components: reading existing ISOs and building new ones.

Reading and Extracting

To read an ISO, initialize the WiiIsoReader with a binary stream. You can iterate through the partitions and access the decrypted file data using the FST offsets. (currently just copied/paste the examples in the above directory)

from wiithon.disc.WiiIsoReader import WiiIsoReader

# Opening the ISO
with WiiIsoReader("your_iso_file.iso") as reader:
    print(f"Game: {reader.disc_header.game_title}")

    data = reader.get_data_partition()
    partition = reader.open_partition(data)

    for path in partition.list_files():
        print(path)

    print(f"Number of files: {len(partition.list_files())}")

Building

To build an ISO, you can use some interfaces. Each interface has their specificities like copying an ISO, patching an ISO or building from a folder from your explorer. Currently, only the copy one exists.

from wiithon.builder.CopyBuilder import CopyBuilder
from wiithon.disc.WiiIsoReader import WiiIsoReader
from wiithon.builder.WiiDiscBuilder import WiiDiscBuilder

SOURCE_PATH = "your_iso_file.iso"
DEST_PATH = "output_iso.iso"

print(f"Source : {SOURCE_PATH}")
print(f"Dest   : {DEST_PATH}")

# Open the original ISO
with WiiIsoReader(SOURCE_PATH) as reader:
    print(f"Game   : {reader.disc_header.game_title.strip()}")
    print(f"ID     : {reader.disc_header.game_id.decode()}")

    # The main builder
    builder = WiiDiscBuilder(reader.disc_header, reader.region)

    with open(DEST_PATH, 'w+b') as dest:
        # For each partition from the original ISO
        for entry in reader.partitions:
            # Copying and build into the new one
            copy_builder = CopyBuilder(reader, entry, None)
            builder.add_partition(dest, copy_builder, None)

        # To write the header and partitions datas 
        builder.finish(dest)

TODO

Done

• Fixing the H3 table (Dolphin says that is not correct :( )
• Fixing a thing that dolphin says: some block are incorrect but unused
• Adding more WiiPartitionInterface from dir
• Some docs about building and so on
• Adding some tools like Yaz0, RARC
• Writing asm easily
• Patching DOL
• Adding, modifying, removing files
• Wrapper for modifying rarc file

---

Next to do

• Searching empty addresses in dol to add instructions and adding text/data sections
• Refactor/adding constants to avoid magic numbers
• Comment all functions (and inside of it)
• BCSV editor
• BMD - BDL editor

---

Next after next (not ordered)

• Patcher !! (will be available with tools maybe ?)
• Some refactorization (like big break big function into smaller ones)
• Add more unit tests (and change some)
• Improve exception handling for invalid or corrupted ISO headers
• Add a CLI for standard extraction and building
• Adding everything we need to proper have a PyPi page