This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_PAC_2.

Endian Order:Little Endian
Compression:none
Encryption:None


This format is used by the following Games:
Summon Night 3 [PS2]*.pac
Black Matrix 2 [PS2]*.pac
Sacred Blaze [PS2]*.pac
Summon Night 4 [PS2]*.pac
Summon Night EX-Thesis [PS2]*.pac
Dragon Shadow Spell [PS2]*.pac
Summon Night Granthese [PS2]*.pac


This is the format specification information:
 
// ARCHIVE (TYPE 0)
// Color Palettes are PS2-Striped

// HEADER
  2 - Number of Entries
  2 - Archive Type (0)
  4 - Unknown (11)
  
  // for each entry
    2 - Offset [*2048]
    2 - Length [*2048]
    
  X - null Padding to a multiple of 2048 bytes
  
// BLOCK TYPE 1
  2 - Block Type (1)
  2 - null
  4 - Unknown (16)
  4 - Unknown (52)
  4 - Unknown (88)
  4 - Unknown (1)
  4 - Unknown (8)
  4 - Unknown (1)
  4 - null
  4 - Unknown (1)
  4 - Unknown
  4 - Image Data Offset (4096)
  4 - Unknown
  4 - null
  4 - Unknown (1)
  4 - Unknown (2)
  4 - Unknown (1)
  4 - Unknown (272)
  4 - null
  4 - Unknown
  4 - Unknown
  4 - Unknown
  1964 - null Padding to a multiple of 2048 bytes
  
// IMAGE DATA (BLOCK TYPE 0)
  2 - Block Type (0)
  2 - Number of Images
  4 - Pixel Data Offset (relative to the start of the Image Data block) (128)
  4 - Color Palette Offset (relative to the start of the Image Data block)
  
  // for each image
    4 - Image ID (incremental from 0)
    
  X - null padding to offset 128
  
  // PIXEL DATA
    4 - Number of Images
    12 - null
    
    // for each image
      4 - Image Width
      4 - Image Height
      4 - Pixel Data Offset (relative to the start of the Pixel Data block)
      4 - Unknown
      4 - Unknown
      12 - null
      4 - Unknown
      4 - Unknown
      4 - Unknown (14)
      8 - null
      4 - Unknown
      4 - Unknown (80)
      12 - null
      4 - Unknown (81)
      4 - null
      4 - Image Width
      4 - Image Height
      4 - Unknown (82)
      12 - null
      4 - Unknown (83)
      4 - null
      4 - Unknown
      4 - Unknown
      4 - Unknown (14)
      4 - null
      4 - Unknown
      4 - Unknown (6)
      4 - Unknown (6)
      4 - null
      
    // for each image
      // for each pixel
        1 - Palette Index
    
  // PALETTE DATA
    4 - Unknown (1)
    12 - null
    4 - Unknown (16)
    4 - Unknown (16)
    4 - Unknown (128)
    4 - Unknown (64)
    4 - Unknown (64)
    12 - null
    4 - Unknown
    4 - Unknown
    4 - Unknown (14)
    8 - null
    4 - Unknown
    4 - Unknown (80)
    12 - null
    4 - Unknown (81)
    4 - null
    4 - Unknown (16)
    4 - Unknown (16)
    4 - Unknown (82)
    12 - null
    4 - Unknown (83)
    4 - null
    
    // for each color
      4 - RGBA
      
  X - null Padding to a multiple of 2048 bytes
  
// OTHER DATA
  X - Other Data
  
  
  
// ARCHIVE (TYPE 1)
// Color Palettes are PS2-Striped

// HEADER
  2 - Number of Entries
  2 - Archive Type (1)
  4 - Unknown (4)
  
  // for each entry
    4 - Offset [*16]
    4 - Length [*16]
    
  X - null Padding to a multiple of 16 bytes
  
// IMAGE DATA (BLOCK TYPE 0)
  2 - Block Type (0)
  2 - Number of Images
  4 - Pixel Data Offset (relative to the start of the Image Data block) (128)
  4 - Color Palette Offset (relative to the start of the Image Data block)
  
  // for each image
    4 - Image ID (incremental from 0)
    
  X - null padding to offset 128
  
  // PIXEL DATA
    4 - Number of Images
    12 - null
    
    // for each image (144 bytes per entry)
      4 - Image Width
      4 - Image Height
      4 - Pixel Data Offset (relative to the start of the Pixel Data block)
      4 - Unknown
      4 - Unknown
      12 - null
      4 - Unknown
      4 - Unknown
      4 - Unknown (14)
      8 - null
      4 - Unknown
      4 - Unknown (80)
      12 - null
      4 - Unknown (81)
      4 - null
      4 - Image Width
      4 - Image Height
      4 - Unknown (82)
      12 - null
      4 - Unknown (83)
      4 - null
      4 - Unknown
      4 - Unknown
      4 - Unknown (14)
      4 - null
      4 - Unknown
      4 - Unknown (6)
      4 - Unknown (6)
      4 - null
      
    // for each image
      // for each pixel
        1 - Palette Index
    
  // PALETTE DATA
    4 - Unknown (1)
    12 - null
    4 - Unknown (16)
    4 - Unknown (16)
    4 - Unknown (128)
    4 - Unknown (64)
    4 - Unknown (64)
    12 - null
    4 - Unknown
    4 - Unknown
    4 - Unknown (14)
    8 - null
    4 - Unknown
    4 - Unknown (80)
    12 - null
    4 - Unknown (81)
    4 - null
    4 - Unknown (16)
    4 - Unknown (16)
    4 - Unknown (82)
    12 - null
    4 - Unknown (83)
    4 - null
    
    // for each color
      4 - RGBA
      
  X - null Padding to a multiple of 16 bytes
  
// OTHER DATA
  X - Other Data


Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.
 
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