Unpacking and packaging for Qualcomm splash images

Related tags

Build Tools android php tool splash splashscreen qualcomm
Overview

Magic Splash Wand

Version: 1.1

Magic Splash!! Wand

Unpacking and packaging for Qualcomm splash images.

How to use

  1. Download and install PHP for your system from the official website.
  2. Enable GD extension in php.ini.
  3. Open the terminal and use PHP interpreter to execute the script with the usage.
  4. Wait for the script to run.

Workaround

While cracking the BootLoader of OPPO Watch 2 eSIM Series, I got interested in its Splash. It's format is not quite the same as the script provided by Qualcomm.

After analysis, it contains multiple logos and store information with the structure below:

Splash
│
├── Header
│   │
│   ├──(header structure)
│   │   │
│   │   │      *** Splash Identity ***
│   │   │
│   │   ├── char[8] magic;      <--- magic header, "SPLASH!!"
│   │   │
│   │   │      *** Content Identity ***
│   │   │
│   │   └── unsigned number;    <--- number of logos, little endian
│   │
│   ├──(logo structure)
│   │   │
│   │   │      *** Content 1 Information ***
│   │   │
│   │   ├── unsigned width;     <--- logo's width, little endian
│   │   ├── unsigned height;    <--- logo's height, little endian
│   │   ├── unsigned type;      <--- 0, Raw Image; 1, RLE24 Compressed Image
│   │   ├── unsigned blocks;    <--- block number, real size / 512
│   │   └── unsigned offset;    <--- offset of logo's content, little endian
│   │
│   ├──(logo structure)
│   │   │
│   │   │      *** Content 2 Information ***
│   │   │
│   │   ├── unsigned width;
│   │   ├── unsigned height;
│   │   ├── unsigned type;
│   │   ├── unsigned blocks;
│   │   └── unsigned offset;
│   │
│   ├──(logo structure)
│   │   │
│   │   │      *** Content N Information ***
│   │   ├── ...
│   │   └── ...
│   │
│   └── ...
│
└── Payload data
    │
    │      *** Content 1 data ***
    │
    ├── (data)     <--- logo's content
    │
    │      *** Content 1 data ***
    │
    ├── (data)
    │
    │      *** Content N data ***
    │
    ├── ...
    └── ...

The original script was so old that it didn't even support Python 3.x. It's a pain to retrofit on top of it.

Out of distaste for Python syntax, I rewrote the script in PHP and added unpacking support.

Have fun :)

TO-DOs

  • Package method: Raw
  • Image format support: GD, GD2, WBMP, WEBP, XBM, XPM

Changelog

  • v1.1:
    • Implement repack
  • v1.0:
    • First ver

License

No license, you are only allowed to use this project. All rights are reserved by MeowCat Studio, Meow Mobile and MlgmXyysd.

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