Unity Unity3d UnityFS

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Unity3d

• Format Type : Archive
  
• Endian Order : Little Endian / Big Endian
  

Format Specifications

// Unity3d file format

// header
8 bytes (char) - signature + null // "UnityFS"
4 bytes (uint32) - version  // 6
6 bytes (char) - minimum player version + null  // e.g. "5.x.x."
12 bytes (char) - file engine version + null // e.g. "2018.4.24f1." (Shadowverse)
                                             //      "2018.4.5f1.." (Blacksad)
8 bytes (uint64) - archive size
4 bytes (uint32) - compressed "info block" data size
4 bytes (uint32) - uncompressed "info block" data size
4 bytes (uint32) - flags


// info block
// Note: this section may be compressed with LZ4
{
   // blocks info
   16 bytes - hash
   4 bytes (uint32) - number of blocks  
   num_of_blocks *
   {
      4 bytes (uint32) - uncompressed block size
      4 bytes (uint32) - compressed block size
      2 bytes (uint16) - flags
   }

   // paths info
   4 bytes (uint32) - number of paths
   num_of_paths *
   {
      8 bytes (uint64) - path location
      8 bytes (uint64) - size of the uncompressed data
      4 bytes (uint32) - flags  // 0x04 - serialized file
      37 bytes (char) - filepath  // e.g. "CAB-c0f952eacf35e09957047188fc534360"
   }
}

   
// data
num_of_files *
{
   x bytes - file data  // may be compressed with LZ4
}  

MultiEx BMS Script

Not written yet.

quickBMS Script

• unity3d_unityFS_script.bms

Notes and Comments

• UnityFS is a new asset bundle format introduced in Unity 5 Engine.
• Files inside archive may be compressed with LZ4 compression method.
• Archive may be partially or fully encrypted with XOR.

Games

List of games using this file format:

• Argonavis from BanG Dream! AAside (Android) (no extension)
• Blacksad: Under The Skin (no extension?)
• Shadowverse (Android) (*.unity3d)

Compatible Programs

• Asset Studio
• UnityPack
• UnityEx
• Unity Assets Bundle Extractor

See Also

• Analysis of Asset Bundle Format
• Deep dive into UnityFS