25 lines
983 B
Markdown
25 lines
983 B
Markdown
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---
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title: "Packets"
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---
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Communication between the [client]({{< ref "ffxiv" >}}) and Servers happen with custom, binary packet structures sent over [TCP](https://en.wikipedia.org/wiki/Transmission_Control_Protocol).
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# Packets
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Each packet begins with a header, that is always the same size and is never encrypted or compressed:
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```rust
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struct PacketHeader {
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unk1: u64, /// Unknown value
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unk2: u64, /// Another unknown value
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timestamp: u64, /// Milliseconds since UNIX epoch
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size: u32, /// Total size of the packet *INCLUDING* this header
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connection_type: ConnectionType, /// The connection this happened on
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segment_count: u16, /// How many segments follow this header
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unk3: u8, /// Yet another unknown value
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compression_type: CompressionType, /// The type of compression used for segment data
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unk4: u16, /// Whoop, more unknowns
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uncompressed_size: u32, /// If compressed, the size of the data when uncompressed. Otherwise, always 0.
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}
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```
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