View source for PAK (File Format)/Evolution Worlds

'''PAK''' is a container file format used in ''[https://en.wikipedia.org/wiki/Evolution_Worlds Evolution Worlds]''. PAK files may contain [[NEO (File Format)|NEO]], [[HSD (File Format)|HSD]], or other nested PAK files. The filenames of internal sub-files is not stored.

= File Format =
The file byte order is always big endian.

== Header ==
The file starts with the following header:

{| class="wikitable"
! Offset !! Type !! Description
|-
| 0x00 || UInt32 || '''Number of entry table slots''' ('''S'''). The number of sub-files is '''S''' - 1, the last slot being a [[#Terminator Slot|terminator]].
|-
| 0x04 || UInt32['''S'''] || '''Sub-file offsets'''.
|-
| 0x04 + '''S''' * 4 || UInt32['''S'''] || '''Sub-file sizes''' in bytes, not including padding.
|}

The header is padded with zeroes up to the next 0x20 byte boundary, so the first sub-file always starts at <code>align(4 + 8 * '''S''', 0x20)</code>, which is also the value of the first offset.

== Terminator Slot ==
The last slot of both arrays does not describe a sub-file. It seems to repeat the first offset and has a size of 0 and none of the loader functions seem to read it, instead, the game derives the sub-file count by subtracting 1 from the slot count.

== Sub-file Data ==
Sub-files are stored back to back in table order, each padded with zeroes to a multiple of 0x20 bytes, so that <code>offset[i] = offset[i - 1] + align(size[i - 1], 0x20)</code>. The size of the whole PAK is therefore <code>offset[n] + align(size[n], 0x20)</code>, where ''n'' is the last sub-file (and not the terminator slot).

= Tools =
The following tools can handle PAK files:
* (none)

[[Category:Evolution Worlds File Formats]]