TFTP packet parser in Rust

Based on rfc 1350.

This is a simple library that parses tftp byte packets. See the [docs] for more information.

The tftp packet

WRQ/RRQ

| Opcode | Filename | 0 | Mode | 0 | | --------------------- | ------------------ | ----------- | ------------------- | ----------- | | 2 bytes | string | 1 byte | string | 1 byte | | 01 or 02 as u16 | "file" as [u8] | 0 as u8 | "octet" as [u8] | 0 as u8 |

DATA

| Opcode | Block # | Data | | ------------- | -------------- | -------------------- | | 2 bytes | 2 bytes | 0 - 512 bytes | | 03 as u16 | 1 - x as u16 | Data Chunk as [u8] |

• Block #: Increments with each block sent
• Data: Transmission terminates automatically if Packet length < 512

ACK

| Opcode | Block # | | ------------- | -------------- | | 2 bytes | 2 bytes | | 04 as u16 | 1 - x as u16 |

ERROR

| Opcode | Error Code | Error Message | 0 | | ------------- | ------------ | ----------------- | ---------- | | 2 bytes | 2 bytes | string | 1 byte | | 05 as u16 | x as u16 | "msg" as [u8] | 0as u8 |

Protocol

WRQ

```mermaid sequenceDiagram participant Client participant Server

Client->>Server: WRQ, TID=69

Note right of Server: Block #35;: 0
Server->>Client: ACK, TID=xyz

loop TID=xyz
    Client-->>Server: DATA
    Server-->>Client: ACK
end

```