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

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