OfwoodCore is an experimental Minecraft 26.1.1 server implementation written entirely in C.

The goal of the project is to understand and control the full server stack — from networking to gameplay — without relying on the JVM or the official server codebase.

• Standalone implementation (not a fork, not a wrapper)
• Modern protocol support (26.1.1, protocol 775)
• Server-authoritative architecture (20 TPS tick loop)
• Non-blocking networking using epoll
• Chunk streaming with async generation workers
• Custom world and player persistence
• Player inventory and containers (chest, furnace, etc.)
• Crafting and cooking (MVP)
• Health, hunger, death, and respawn systems
• Item entities with basic physics
• Server-authoritative mining (timing validation)

The server is structured around three main subsystems:

• Network thread
  Handles accept, socket I/O, packet decoding, and enqueues tasks.

• Tick thread (20 TPS)
  Executes gameplay logic, world updates, protocol handling, and outgoing flush.

• World workers
  Handle chunk loading, generation, and Anvil fallback.

This model ensures that all gameplay logic remains authoritative on the server side.

Supported states:

• Handshake
• Status
• Login (offline mode)
• Configuration
• Play

The protocol is implemented manually via reverse engineering, including:

• VarInt encoding/decoding
• Custom packet framing
• Partial compression support
• Core PLAY packet handling

• In-memory chunk management
• Async chunk generation and loading
• Anvil import support
• Custom storage format (.mcc)
• Autosave and eviction

Current runtime format:

• Flat storage using block_state_id
• Full height range (-64 to 319)

A future refactor toward section-based palettes is planned.

Currently implemented:

• Player inventory
• Containers (chest, furnace, etc.)
• Crafting (2x2 and 3x3)
• Cooking systems
• Health, hunger, regeneration, death
• Item drops

• Server-side validation (START / ABORT / STOP)
• Block hardness-based breaking time
• Rejection of invalid client actions

The server includes built-in instrumentation:

MC_PERF=1 ./mc_server