Minecraft Server To Client protocol - 18 byte packet on login request

I'm working with the Minecraft Server To Client protocol documentation for a server I am making.

It says the packet is 18+ byt开发者_开发技巧es, but I can't seem to figure out what each byte is for.

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Entity ID = int = 4 bytes Map Seed = long = 8 bytes Dimension = byte = 1 byte ?

strings are variables sizes, hence why it says "Total Size: 18 bytes + length of strings"

Sorry I can't be more specific, more detail is needed

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It also says that strings are a short (2 byte) length followed by the string.

Understanding what values go in each of those fields is a much more complicated issue, and i doubt anyone here can help with that.