XeNTaX

Code: Select all

Header:
0x00 String - "2KPR"
Skip 9 bytes
0x0d UInt - File count
0x11 UInt - File table 1 size
0x15 UInt - File table 2 size

File table 1 immediately follows, loop "File count" times, each entry has:
0x00 UInt64 - Hash (Needs hash to filename mapping)
0x08 UInt - File offset
Skip 4 bytes
0x10 UInt - File size (Bit 31 determines if encrypted, if Bit 31 is set, exclude it, eg. using bitshifting with & 0x3fffffff)

Assert current offset position is total header size + file table 1 size

File table 2 immediately follows, loop "File count" times, each entry has:
0x00 String - Filetype (in reverse, eg. NOSJ is JSON)
0x04 UInt - Additional number of bytes for entry (total size is 0x18 + this value)
Skip 4 bytes
0x0C UInt - Decompressed size
Skip x bytes - Where x = 0x18 + (Additional bytes) - 0x10 (current offset into entry)

Assert current offset position is total header size + file table 1 size + file table 2 size

Extraction:
Loop through all entries, use File offset and File size (adjusted if encrypted!) from File table 1, use File type for file-extension and decompressed size from File table 2.

Compression:
If file is encrypted, XOR the bytes with key [0xDC, 0x45, 0xA6, 0x9C, 0xD3, 0x72, 0x4C, 0xAB], then decompress with LZ4.