📦 SDAT2IMG Brotli

Original Project

PyPI

MIT

This Python script extracts and converts Android OTA update files—specifically .dat.br (Brotli compressed) and .transfer.list—into a usable .img disk image. This is especially useful for unpacking system, vendor, or product partitions from A/B OTA packages.

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Changelog / Release Notes

v1.0.3 (2025-05-31)

• Bug Fixes:
  • Add requirements.txt.

v1.0.2 (2025-05-31)

• Bug Fixes:
  • Fixed an issue where the sdat2img-brotli command-line tool failed to correctly parse file paths (e.g., -d, -t arguments) provided by the user. This occurred because the argument parsing logic was not executed when the tool was invoked via its console entry point. The argparse logic has been moved directly into the main conversion function (convert_rom_files_function) to ensure robust argument handling across all execution methods.

v1.0.1 (2025-05-31)

• Improved: Simplified library import. Users can now directly from sdat2img_brotli import convert_rom_files_function.

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✨ Features

• ✔️ Supports .dat.br files (Brotli compressed).
• ✔️ Converts .dat + .transfer.list into a flashable .img.
• ✔️ Automatic decompression of .dat.br and cleanup of temporary .dat files.
• ✔️ Flexible input/output paths via command-line arguments (CLI).
• ✔️ Defaults to current directory files if no arguments are provided for ease of use.
• ✔️ User-friendly logs and error messages.

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🚀 Installation

You can easily install sdat2img-brotli using pip:

pip install sdat2img-brotli

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🔧 Requirements

• Python 3.6 or higher.
• The brotli Python module (automatically installed via pip).

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📖 Usage

This script offers two convenient ways to run it:

1. Simple Run (Using Default Files)

If your system.new.dat.br and system.transfer.list files are in the same directory where you run the command, simply execute:

sdat2img-brotli

The tool will automatically:

1. Decompress system.new.dat.br into system.new.dat.
2. Convert system.new.dat and system.transfer.list into system.img.

2. Advanced Run (Using Command-Line Arguments)

For more flexibility, you can specify the paths for input files and the output filename using command-line arguments. This is ideal for processing files not in the current directory or for renaming the output.

sdat2img-brotli -d <path_to_dat_br_file> -t <path_to_transfer_list_file> -o <output_img_name>

Arguments:

• -d or --datbr: Specifies the path to the .dat.br input file.
  • Example: -d "C:\roms\my_system.new.dat.br"
  • Default: system.new.dat.br
• -t or --transferlist: Specifies the path to the .transfer.list input file.
  • Example: -t "C:\roms\my_system.transfer.list"
  • Default: system.transfer.list
• -o or --outputimg: Specifies the name and path for the output .img file.
  • Example: -o "extracted_system.img"
  • Default: system.img

Practical Examples:

• Convert a vendor partition located in a specific folder:

  sdat2img-brotli -d "D:\OTA\vendor.new.dat.br" -t "D:\OTA\vendor.transfer.list" -o "vendor.img"

• Generate an img with a custom name in the current directory:

  sdat2img-brotli -o "my_custom_system.img"

• Get help and see all available options:

  sdat2img-brotli --help

3. Usage as a Python Library

You can also import and use the core conversion function in your own Python projects:

from sdat2img_brotli.main import convert_rom_files_function

# Example 1: Use default files (system.new.dat.br, system.transfer.list, system.img)
print("--- Starting conversion with default files ---")
success_default = convert_rom_files_function()
if success_default:
    print("Default conversion successful! 🎉")
else:
    print("Default conversion failed! ❌")

print("\n" + "="*50 + "\n")

# Example 2: Specify custom file paths
print("--- Starting conversion with custom files ---")
my_datbr_path = "path/to/your/custom_rom.new.dat.br" # Replace with your actual path
my_transfer_list_path = "path/to/your/custom_rom.transfer.list" # Replace with your actual path
my_output_image_name = "custom_extracted_image.img"

success_custom = convert_rom_files_function(
    datbr_path=my_datbr_path,
    transferlist_path=my_transfer_list_path,
    output_img_name=my_output_image_name
)

if success_custom:
    print(f"Custom conversion successful! Output: {my_output_image_name} 🎉")
else:
    print("Custom conversion failed! ❌")

Note: When using as a library, ensure the input files (.dat.br and .transfer.list) exist at the specified paths.

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📁 Output

Upon successful conversion, a .img file (e.g., system.img, vendor.img) will be generated. This is a raw disk image that can be opened and explored with various tools, such as:

• 7-Zip
• DiskGenius
• Linux Reader (for Windows)
• mount command (on Linux)
• Other ext4 filesystem tools on Linux

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🙏 Credits

• Based on xpirt’s sdat2img (MIT License)
• Includes Google Brotli library (MIT License)

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📄 License

This script is open-source and released under the MIT License. Use it freely and feel free to contribute!

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