GRAF:3D Sex Villa BXP

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BXP

• Format type: Archive
• Endianness: Little-endian

Format Specifications

// ARCHIVE HEADER

char {8}     - Header ("BXP" + (byte)2 + "ARCH")

uint64 {8}   - Archive Length [+32]

uint64 {8}   - Padding (88,39,255,135,206,225,196,1)

uint64 {8}   - null

// ARCHIVE INDEX

char {8}     - Header ("BXP" + (byte)2 + "INDX")

uint64 {8}   - Unknown

uint64 {8}   - Padding (88,39,255,135,206,225,196,1)

uint64 {8}   - null

byte {16}    - CRC?

byte {16}    - CRC? (same as above field)

// FOLDER TREE

char {8}     - Header ("BXP" + (byte)2 + "TREE")

uint64 {8}   - Offset to the "// FILE DATA" [+128] (ie relative to "// DIRECTORIES")

uint64 {8}   - Padding (88,39,255,135,206,225,196,1)

uint64 {8}   - null

// DIRECTORIES

// for each directory

char {8}     - Header ("BXP" + (byte)2 + "SDIR")

uint64 {8}   - Unknown Length/Offset

byte {16}    - null

uint32 {4}   - Number Of Sub-Directories in this directory

uint32 {4}   - Number Of Files in this directory

uint64 {8}   - Length Of Filename Directory Component (length of subDirName+null + fileNames+nulls)

byte {16}    - null

// for each sub-directory in this directory

uint32 {4}   - null

uint32 {4}   - Relative Offset To This Directory? (32) (relative to the start of this subDirEntry)

uint32 {4}   - Hash?

char {X}     - Sub-Directory Name

byte {1}     - null Sub-Directory Name Terminator

byte {X}     - null Padding to a multiple of 32 bytes

// for each file in this directory

uint64 {8}   - Filename Offset (relative to the start of the filename directory)

uint64 {8}   - null

byte {16}    - CRC?

uint32 {4}   - null

uint32 {4}   - Unknown (1)

uint64 {8}   - null

uint64 {8}   - File Length (not including the file header fields?)

uint64 {8}   - File Offset (relative to the start of the file data)

// repeat for each sub-directory (repeat from "// for each directory")

byte {32}    - CRC?

// FILENAME DIRECTORY

// for each file

char {X}     - Filename

byte {1}     - null Filename Terminator

byte {X}     - null Padding to a multiple of 32 bytes

// FILE DATA

char {8}     - Header ("BXP" + (byte)2 + "DATA")

uint64 {8}   - Total Length Of File Data (length of everything in "// for each file")

uint64 {8}   - Padding (88,39,255,135,206,225,196,1)

uint64 {8}   - null

// for each file

char {8}     - Header ("BXP" + (byte)2 + "FILE")

uint64 {8}   - File Length (length of "X - File Data" only) [+30]

uint64 {8}   - CRC?

uint32 {4}   - null

uint32 {4}   - Unknown (1)

byte {X}     - File Data

byte {X}     - null Padding to a multiple of 32 bytes

Notes and Comments

This was originally posted on Template:GRAFTemplate1 by 85.92.55.33 (contribs); I don't know for sure if this is the page they meant to post to (though I'm pretty sure it is) or if the information is accurate.

1. In the version 24, the file names are encrypted as XOR 0xBE.

2. "BXP" + (byte) in all headers: In the version 24, the (byte)=3.

3. // ARCHIVE INDEX

   char {8}     - Header ("BXP" + (byte)2 + "INDX")
   uint64 {8}   - Unknown   <-----   this shuld be relative offset to the first "BXP.FILE" 

I have used folloxing piece of C++ code:

 ArchiveOffset = 0x00;
 IndexOffset = 0x20;
 TreeOffset = 0x60;
 DirOffset = 0x80;
 DataOffset = DirOffset + (__int64*) &buffer[TreeOffset + 8];
 FileOffset = DirOffset + (__int64*) &buffer[IndexOffset + 8];

4. There are some directories containing both files and sub-directories. In such case, the files are listed prior to the sub-directories. I guess that the structure of directory // see 6.

5. I have successfuly extracted all files from the archive. Sound (*.ogg) files play well, however some other files (scripts) seems to be encrypted. Further I am wholly confused with CRCs, HASHs and Paddings for now, so I can not build an modified archive.

6. "uint32 {4} - Unknown (1)" is a switch: 0="file is not compressed" 1="file is compressed"; compression method is zlib (*.gz). The same switch is in the "BXP.FILE" section. I suguest that to modify the structure of "BXP.SDIR" to:

{
  char {8}     - Header ("BXP" + (byte)2 + "SDIR")
  uint64 {8}   - Unknown Length/Offset
  byte {16}    - null
  uint32 {4}   - Number Of Sub-Directories in this directory
  uint32 {4}   - Number Of Files in this directory
  uint64 {8}   - Length Of Filename Directory Component (length of subDirName+null + fileNames+nulls)
  byte {16}    - null 
  for (each file)
  {
    uint64 {8}   - Filename Offset (relative to the start of the filename directory)
    uint64 {8}   - null
    byte {16}    - CRC?
    uint32 {4}   - null
    uint32 {4}   - A switch indicating if the file is compressed. 0=no, 1=yes //compression method: zlib (*.gz)
    uint64 {8}   - null
    uint64 {8}   - File Length (not including the file header fields?)
    uint64 {8}   - File Offset (relative to the start of the file data) 
  }
  for (each sub-directory)
  {
    uint32 {4}   - null   // Filename Offset (relative to the start of the filename directory)
    uint32 {4}   - Relative Offset To This Directory? (32) (relative to the start of this subDirEntry)
  }
  for (each entry)            // entry is file or sub-directory
  {
    uint32 {4}   -   Hash?  
  } 
  for (each entry)
  {
    char {X}     - Filename                         // XOR 0xBE      in version 24
    byte {1}     - null Filename Terminator         // 0xBE          in version 24
  }
}

7. First 32 bytes of each file if "File Data" is a header of checksum, which is not necessary for file extraction.

 {
   // FILE DATA
   char {8}     - Header ("BXP" + (byte)2 + "DATA")
   uint64 {8}   - Total Length Of File Data (length of everything in "// for each file")
   uint64 {8}   - Padding (88,39,255,135,206,225,196,1)
   uint64 {8}   - null

   for (each file)
   {
       char {8}     - Header ("BXP" + (byte)2 + "FILE")
       uint64 {8}   - File Length (length of "X - File Data" only) [+30]
       uint64 {8}   - CRC?
       uint32 {4}   - null
       uint32 {4}   - A switch indicating if the file is compressed. 0=no, 1=yes //compression method: zlib (*.gz)
       byte (16)    - A header or check-sum?
       byte (16)    - For uncompressed file the same as previous byte (16), for copressed different. Maybe check-sum of decompressed file?
       byte {X}     - File Data
       byte {X}     - null Padding to a multiple of 32 bytes 
   }
 }

• • • by Gregory

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