Technical Reference

Detailed documentation of DOKAPON! Sword of Fury’s file formats and compression systems.

Overview

This section contains reverse-engineered documentation of the game’s proprietary file formats. These technical details are essential for creating modding tools and understanding how game assets work.

File Formats

LZ77 Compression

The compression system used across multiple file formats in the game.

Nintendo-style LZ77 variant
10-bit sliding window (1-1024 bytes)
Block-based compression with markers

MDL Model Format

3D model format used for characters, enemies, and objects.

LZ77 compressed container
PS2-style VIF commands for geometry
Vertex, normal, and index data blocks
Animation and transform sequences

SPRANM Sprite Animation Format

Sprite animation format for 2D graphics and effects.

Animation control files (compressed)
Sprite resource files (with embedded PNG)
Transform matrices and keyframe data
State-based animation system

MPD Map/Cell Format

Map and cell data format for game environments.

Cell-based organization
Index and data sections
Dimension and alignment data

Architecture Overview

Game Asset Pipeline
├── Raw Assets
│   ├── 3D Models (.mdl)
│   ├── 2D Sprites (.spranm)
│   ├── Map Data (.mpd)
│   └── Textures (.tex)
│
├── Compression Layer
│   └── LZ77 Compression
│       ├── 16-byte header
│       ├── Compressed stream
│       └── Block markers
│
└── Runtime Processing
    ├── Decompression
    ├── Block parsing
    └── GPU upload

Common Patterns

Block Markers

Marker	Type	Description
`0xAAAAAAAA`	Alignment	Block boundary/padding
`0x55555555`	Structure	Section structure marker
`0x0000C000`	Geometry	Vertex data block
`0x000040C1`	Normal	Normal vector data
`0x00004000`	Index	Triangle index data
`0x000080B9`	Animation	Animation frame data
`0xFFFFFFFF`	Data	Raw data block
`0x0000803F`	Float	Float value (1.0)

Data Alignment

Most data in these formats follows specific alignment rules:

4-byte alignment: Standard for most integer and float data
12-byte stride: Vertex and normal vectors (3× float32)
16-byte alignment: Matrices and quaternions
2048-byte boundaries: Major section divisions

Tools Reference

The following tools work with these formats:

Tool	Formats	Purpose
Dokapon Extract	.tex, .mpd, .spranm, .fnt	Extract and repack assets
Image Extractor	.fnt, .spranm	Extract embedded PNG images
Text Extractor	.exe	Extract and modify game text

Research Notes

This documentation is based on community reverse-engineering efforts. Some details may be incomplete or subject to revision as research continues.

Contributing

Help improve this documentation:

Submit corrections via pull request
Share additional research findings
Report inaccuracies in the format documentation
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