Block diagram
This page hosts a formal specification of .pak file format of Games based on Haxe Game Framework "Heaps" (e.g. Dead Cells) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
meta:
id: heaps_pak
application: Games based on Haxe Game Framework "Heaps" (e.g. Dead Cells)
file-extension: pak
license: MIT
encoding: UTF-8
endian: le
doc-ref: 'https://github.com/HeapsIO/heaps/blob/2bbc2b386952dfd8856c04a854bb706a52cb4b58/hxd/fmt/pak/Reader.hx'
seq:
- id: header
type: header
types:
header:
seq:
- id: magic1
contents: 'PAK'
- id: version
type: u1
- id: len_header
type: u4
- id: len_data
type: u4
- id: root_entry
type: entry
size: len_header - 16
- id: magic2
contents: 'DATA'
types:
entry:
doc-ref: 'https://github.com/HeapsIO/heaps/blob/2bbc2b386952dfd8856c04a854bb706a52cb4b58/hxd/fmt/pak/Data.hx'
seq:
- id: len_name
type: u1
- id: name
type: str
size: len_name
- id: flags
type: flags
- id: body
type:
switch-on: flags.is_dir
cases:
true : dir
false : file
types:
flags:
seq:
- id: unused
type: b7
- id: is_dir
type: b1
file:
seq:
- id: ofs_data
type: u4
- id: len_data
type: u4
# Adler32 checksum
- id: checksum
size: 4
instances:
data:
io: _root._io
pos: _root.header.len_header + ofs_data
size: len_data
dir:
seq:
- id: num_entries
type: u4
- id: entries
type: entry
repeat: expr
repeat-expr: num_entries