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README.md

sfn is a simple and efficient protocol for transferring files over network. It's easy to use, and a full-featured client can be implemented in half an hour. Due to this simplicity, many implementations in different languages were created. Send yours.

Protocol revisions

L1 is the most basic one, L3 has checksum support, L4 has faster checksum support. L5 supports sending directories. Revisions are backward-compatible: every new revision includes support for existing opcodes all the way back to L1. See the full spec.

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protocol protocol Public

Protocol specification for sfn, the simple and efficient protocol for sending files over network.

1
sfn-d sfn-d Public

Small and simple utility to send files over network. This is the reference implementation of sfn L4.

D 2
sfn-go-cli sfn-go-cli Public

CLI implementation of sfn L4 in Go language (L5 is in beta)

Go 1
sfn-go-gtk sfn-go-gtk Public

GUI utility to send any files via direct connection using sfn L1 protocol

Go 2 1
sfn-rust sfn-rust Public

Yet another L4 implementation, this time in Rust. Stability: beta.

Rust 1
sfn-zig sfn-zig Public

Implementation of sfn L1 in Zig language (incomplete, server only). Smallest in the world: requires just 4 Kb of RAM (+buffer).

Zig 1

Repositories

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All C D Go Java Rust Zig

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Showing 9 of 9 repositories

sfn-go-cli Public
CLI implementation of sfn L4 in Go language (L5 is in beta)

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sfn-software/sfn-go-cli's past year of commit activity

Go 1 MIT 0 2 0 Updated Aug 13, 2026
sfn-c Public
Small utility to send any files via direct connection using sfn L5 protocol

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sfn-software/sfn-c's past year of commit activity

C 5 1 0 0 Updated May 20, 2026
sfn-java Public
Utility to send any files via direct connection using sfn L4 protocol

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sfn-software/sfn-java's past year of commit activity

Java 1 MIT 0 0 0 Updated Jan 22, 2025
protocol Public
Protocol specification for sfn, the simple and efficient protocol for sending files over network.

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sfn-software/protocol's past year of commit activity

1 MIT 0 0 0 Updated Oct 28, 2024
sfn-rust Public
Yet another L4 implementation, this time in Rust. Stability: beta.

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sfn-software/sfn-rust's past year of commit activity

Rust 0 1 0 0 Updated Apr 15, 2024
sfn-go-gtk Public
GUI utility to send any files via direct connection using sfn L1 protocol

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sfn-software/sfn-go-gtk's past year of commit activity

Go 2 MIT 1 0 1 Updated Aug 30, 2023
.github Public

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sfn-software/.github's past year of commit activity

0 0 0 0 Updated Aug 31, 2022
sfn-d Public
Small and simple utility to send files over network. This is the reference implementation of sfn L4.

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sfn-software/sfn-d's past year of commit activity

D 2 MIT 0 10 0 Updated Jul 12, 2022
sfn-zig Public
Implementation of sfn L1 in Zig language (incomplete, server only). Smallest in the world: requires just 4 Kb of RAM (+buffer).

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sfn-software/sfn-zig's past year of commit activity

Zig 1 MIT 0 0 0 Updated Jul 12, 2022

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