The Genius of Sappheiros: Weekend PAK

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PAK

• Format Type : Archive
  
• Endian Order : Little Endian
  
• Signature : None
  

Format Specifications

// The Genius of Sappheiros: Weekend PAK file format

4 bytes (uint32) - TOC length

// whole TOC is encrypted
4 bytes (uint32) - CRC check value (for TOC data)
num_of_files *
{
   x bytes (char) - file path + null   // path may contain japaneese characters
   4 bytes (uint32) - file compressed size
   4 bytes (uint32) - file decompressed size 
   4 bytes (uint32) - file relative offset
   1 byte (bool) - flag?
   4 bytes (uint32) - seed?
} 

num_of_files *
{
   x bytes - file data   // encrypted
}

QuickBMS Script

• PAK script

Notes and Comments

• TOC is encrypted with Mersenne Twister algorithm.
• File data is encrypted with XOR (64 bytes key).
• Some files may be compressed with ZLIB.

Games

List of games using this file format:

• Monsters Card
• The Genius of Sappheiros: Weekend (*.PAK)

Compatible Programs

• TH.PAK.Tool