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Format Specifications

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Notes and Comments

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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