Kotlin UDP File Transfer

A robust Client-Server system for local network file transfers using the UDP protocol. This project implements block sending (chunking), end-to-end integrity verification, and a command-line interface with real-time visual feedback.

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Next steps:

• Implement packet order verification with a waiting queue

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✨ Features

• UDP Transfer: Fast communication using DatagramSocket and DatagramPacket.
• Data Integrity (SHA-1): Since UDP does not guarantee perfect delivery, each 1024-byte packet carries a 20-byte SHA-1 signature. The server recalculates the hash upon arrival and discards corrupted packets.
• Dynamic Progress Bar: Visual feedback in the terminal (|====> | 50%) calculated based on the file size and the number of packets sent/received.
• File Selection (GUI): The client uses Java Swing's JFileChooser with the operating system's native theme to facilitate file selection.
• Logging System: The server records start, success, and error events with timestamps using KotlinLogging.

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📂 Structure

📦 kotlin-udp-file-transfer
 ┣ 📂 client
 ┃ ┗ 📂 src/main/kotlin/bonfim/jordan
 ┃ ┃ ┗ 📜 Client.kt
 ┣ 📂 server
 ┃ ┣ 📂 files (Received files are saved here)
 ┃ ┗ 📂 src/main/kotlin/bonfim/jordan
 ┃ ┃ ┗ 📜 Server.kt
 ┗ 📜 README.md