What is FastProto?

FastProto is a lightweight Java library that makes binary protocols effortless. Simply annotate your data structure and let FastProto deal with the byte‑level work.

Key Features

Annotation‑Driven

Quickly map binary data to Java fields.

Broad Type Support

Primitives, unsigned numbers, strings, time types, arrays and collections.

Flexible Addressing

Reverse addressing for variable‑length packets.

Configurable Byte & Bit Order

Big‑endian or little‑endian; MSB/LSB bit ordering.

Custom Formulas

Use lambdas or classes to transform values during encode/decode.

Checksum/CRC

Single‑annotation @Checksum with CRC8/16/32/64, LRC, XOR.

Easy APIs

Multiple APIs tuned for efficiency and reliability.

Basic Usage

import org.indunet.fastproto.FastProto;
import org.indunet.fastproto.annotation.UInt8Type;

public class Packet {
  @UInt8Type(offset = 0) int id;
}

byte[] bytes = new byte[]{1};
Packet p = FastProto.decode(bytes, Packet.class);
byte[] out = FastProto.encode(p, 1);

Get Started

Read the Quick Start and core guides to begin:

Install

Maven

<dependency>
  <groupId>org.indunet</groupId>
  <artifactId>fastproto</artifactId>
  <version>3.12.1</version>
</dependency>

Gradle

implementation "org.indunet:fastproto:3.12.1"

License

FastProto is released under the Apache License 2.0. Commercial‑friendly and widely adopted.

Source code on GitHub. Artifacts on Maven Central.