{"id":7570,"library":"pyimg4","title":"PyIMG4","description":"PyIMG4 is a Python library and CLI tool designed for parsing, manipulating, and creating Apple's proprietary Image4 format, including IMG4, IM4M (manifest), and IM4P (payload) files. It is currently at version 0.8.8 and maintains a relatively active release cadence, with updates addressing bugs, adding features, and refining internal logic.","status":"active","version":"0.8.8","language":"en","source_language":"en","source_url":"https://github.com/m1stadev/PyIMG4","tags":["Apple","Image4","IMG4","IM4M","IM4P","firmware","security","parsing","iOS"],"install":[{"cmd":"pip install pyimg4","lang":"bash","label":"Standard Installation"}],"dependencies":[{"reason":"Core dependency for ASN.1 parsing within Image4 format.","package":"asn1","optional":false},{"reason":"Core dependency for packet manipulation and ASN.1 handling.","package":"scapy","optional":false},{"reason":"Required for LZFSE compression/decompression on macOS (*OS) systems. Automatically installed by pip if on macOS.","package":"apple-compress","optional":false},{"reason":"Required for LZFSE compression/decompression on non-macOS systems. Automatically installed by pip if not on macOS.","package":"lzfse","optional":false}],"imports":[{"note":"Classes like IMG4, IM4M, IM4P are directly imported from the pyimg4 package.","wrong":"import IMG4","symbol":"IMG4","correct":"from pyimg4 import IMG4"},{"symbol":"IM4M","correct":"from pyimg4 import IM4M"},{"symbol":"IM4P","correct":"from pyimg4 import IM4P"}],"quickstart":{"code":"from pyimg4 import IMG4\n\n# Example: Extracting IM4P payload from an IMG4 file\ntry:\n    # Simulate reading an IMG4 file (replace 'path/to/myfile.img4' with actual path)\n    # For demonstration, we create a dummy file. In a real scenario, this would be `open('myfile.img4', 'rb')`\n    dummy_img4_data = b'IMG4\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x00IM4P\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x00ABCD\\x00\\x00\\x00\\x08\\x00\\x00\\x00\\x00IM4M\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x00MNFT\\x00\\x00\\x00\\x04DATA'\n    \n    # Open the IMG4 file (or use dummy data as shown)\n    i = IMG4(dummy_img4_data)\n\n    print(\"IMG4 file content:\")\n    i.show() # Display the structure of the IMG4 object\n\n    # Extract and print the IM4P payload data\n    if i.IM4P and i.IM4P.DATA:\n        print(\"\\nExtracted IM4P Payload Data (first 100 bytes):\")\n        print(i.IM4P.DATA[:100])\n    else:\n        print(\"No IM4P payload data found.\")\n\nexcept Exception as e:\n    print(f\"An error occurred: {e}\")","lang":"python","description":"This quickstart demonstrates how to parse an Image4 file, display its contents, and extract the IM4P payload data using PyIMG4. It simulates reading a dummy Image4 file for immediate execution."},"warnings":[{"fix":"Upgrade Python to 3.9 or higher: `pyenv install 3.9` / `conda install python=3.9`.","message":"Python 3.8 support was dropped in PyIMG4 v0.8.7. Users on Python 3.8 or older will need to upgrade their Python environment or use an older PyIMG4 version.","severity":"breaking","affected_versions":">=0.8.7"},{"fix":"Ensure a clean reinstall to pick up new dependencies: `pip install --no-cache-dir --upgrade pyimg4`. If issues persist, manually install: `pip install apple-compress` (macOS) or `pip install lzfse` (other OS).","message":"Compression libraries (apple-compress/lzfse) are no longer optional since v0.8.4. Previous installations that relied on the `[compression]` extra might encounter `RuntimeError` if these dependencies are missing, though `pip` should automatically handle platform-specific installations now.","severity":"breaking","affected_versions":">=0.8.4"},{"fix":"Update imports and code to use the new class names for manifest properties and image data.","message":"Class names were refactored in v0.7. `pyimg4.ManifestProperty` was renamed to `pyimg4._Property`, and `pyimg4.ManifestImageData` was renamed to `pyimg4._PropertyGroup`. New classes (`pyimg4.ManifestProperty` and `pyimg4.ManifestImageProperties`) now subclass these internal names.","severity":"breaking","affected_versions":">=0.7"},{"fix":"Downgrade `asn1`: `pip install 'asn1<3.0.0'`. Consider using a virtual environment to manage dependencies.","message":"The `asn1` dependency was pinned to `<3.0.0` in v0.8.8. If you have `asn1` version 3.0.0 or higher installed, it might cause dependency conflicts or `PyIMG4` to fail installation/operation.","severity":"gotcha","affected_versions":">=0.8.8"}],"env_vars":null,"last_verified":"2026-04-16T00:00:00.000Z","next_check":"2026-07-15T00:00:00.000Z","problems":[{"fix":"Ensure PyIMG4 is installed in your current environment: `python3 -m pip install pyimg4`. If using a virtual environment, activate it first. For system-wide issues on Linux, ensure `python3-pip` is installed and the 'universe' repository is enabled (`sudo add-apt-repository universe && sudo apt update`).","cause":"PyIMG4 is not installed in the active Python environment, or the environment's `PATH` variable does not correctly point to the installed packages.","error":"ModuleNotFoundError: No module named 'pyimg4' (or 'pyimg4 is not installed')"},{"fix":"Ensure development headers and compilers are installed (e.g., `sudo apt install build-essential python3-dev` on Debian/Ubuntu, or Xcode Command Line Tools on macOS). Reinstall `pyimg4` with caching disabled: `pip install --no-cache-dir --upgrade pyimg4`.","cause":"This usually indicates missing build tools (e.g., C compiler) required by binary dependencies or conflicts with platform-specific compression libraries.","error":"Error: Command 'setup.py install' failed with error code 1 (or similar errors related to `pylzss`, `apple-compress`, `lzfse` during installation)."},{"fix":"Upgrade PyIMG4 to the latest version: `pip install --upgrade pyimg4`. This issue was addressed in v0.8.7.","cause":"This error occurs in older versions of PyIMG4 (prior to v0.8.7) when attempting to display information for IM4M files where some values might be null or malformed, leading to unexpected `None` objects.","error":"CLI: `Error: 'NoneType' object has no attribute 'get_data'` when using `pyimg4 [im4m/img4] info`"}]}