artuuro / go-sro-fileutils

go-sro-fileutils

Provides utilities to read and parse files of the game Silkroad Online, written in Golang. This repository is mainly used by go-sro-agent-server

Features

• PK2 Reader
• Navmesh Parser

Acknowledgement

As the development was not a single person's effort, I want to thank DaxterSoul for sharing his wide knowledge on the game and its peculiarities.

Without his packet and file structure documentation this would not have been possible.

Additional Projects

As this is just a framework, there are also projects taking this framework into use:

• go-sro-framework
• go-sro-gateway-server
• go-sro-agent-server

Contribution

If you want to engage in the development, you are free to so. Simply fork this project and submit your changes via Pull Requests.

Providing a usable documentation is still a big item on my TODO list for this project. Any help on this is highly appreciated.

If you have any more questions, feel free to contact me.

Licensing

go-sro-fileutils is licensed under the DON'T BE A DICK PUBLIC LICENSE. See LICENSE for the full license text

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Backup / Old Stuff

Item Stats Abbreviations

Abbreviation	Description
ER	Evasion Rate / Parry Rate
PAR	Physical Absorbtion Rate
MAR	Magical Absorbtion Rate
PD	Physical Defense
MD	Magical Defense
Dur	Durability

Degree and Tier

public int DegreeOffset => ItemClass - (3 * ((ItemClass - 1) / 3)) - 1; //sro_client.sub_8BA6E0
public int Degree => ((ItemClass - 1) / 3) + 1;

Navigation mesh

The navigation mesh (navmesh) contains information about which regions are walkable and which are not. First of all let's look at which files exists and how they are related to each other.

The navmesh data is contained inside the Data.pk2/navmesh folder. It includes different file types:

• mapinfo.mfo which includes map information. Especially which regions exist / are used
• nv_XXYY.nvm which are the navmesh files. One nav mesh file describes one region
• .dat which are nav data for the AI
• .ifo which include some more information regarding objects on the map

A region is a field with a size of 1920 x 1920 units. Usually a region has a regular grid, that consists of squares with a minimum size of 20 x 20 units per square. So in total there can be 96 * 96 squares inside a region.

There can also be just 16:

╔════════════╦════════════╦════════════╦════════════╗
║            ║            ║            ║            ║
║    0,0     ║    1,0     ║    2,0     ║    3,0     ║
║            ║            ║            ║            ║
║            ║            ║            ║            ║
╠════════════╬════════════╬════════════╬════════════╣
║            ║            ║            ║            ║
║    0,1     ║    1,1     ║    2,1     ║    3,1     ║
║            ║            ║            ║            ║
║            ║            ║            ║            ║
╠════════════╬════════════╬════════════╬════════════╣
║            ║            ║            ║            ║
║    0,2     ║    1,2     ║    2,2     ║    3,2     ║
║            ║            ║            ║            ║
║            ║            ║            ║            ║
╠════════════╬════════════╬════════════╬════════════╣
║            ║            ║            ║            ║
║    0,3     ║    1,3     ║    2,3     ║    3,3     ║
║            ║            ║            ║            ║
║            ║            ║            ║            ║
╚════════════╩════════════╩════════════╩════════════╝

However, the fields inside of a region do not have to be squares. Usually they are just rectangles.

Each field inside of a region is called cell. Each cell is connected to other cells inside the region. This connection is called edge. This applies to regions as well. So the edges inside a region are called internal edge s. Edges that connect regions are called global edges.

Each region is identified by its coordinate on the world map. As you probably have seen in the nv_XXYY.nvm pattern, the size of the world map is limited to 2 bytes. 1 byte for the x coordinate and 1 byte for the y or z coordinate. So its theoretical max size is 256 * 256. However, this is not 100% true, since 1 bit is used for the dungeon flag. So the real size is 2⁸ x 2⁷ or 256 * 128. So theoretically there can be 32,768 regions on the world map, but not all are used. The vanilla SRO files have ~3300 regions.