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From:
r := GetRouter(d.Options)
To:
r := d.Router()
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From:
r := d.GetOneOption(OptionRouter).(*OptRouter).Routers
d.UpdateOption(&OptRouter{Routers: []net.IP{net.IP{192, 168, 0, 1}}})
To:
r := GetRouter(d.Options)
d.UpdateOption(OptRouter(net.IP{192, 168, 0, 1}, ...))
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- Consolidate writing the option code and length to Options.Marshal
rather than doing it in each individual option.
- Use uio in marshaling code.
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option's codes and lengths were being parsed twice: once in ParseOption
and once in each option type's Parse implementation. Consolidate such
that it only happens once.
Additionally, only pass data to options that they should parse -- we
know the length before the Parse function is called, so the option only
gets to see the data it needs to see.
Also, use uio.Lexer to simplify parsing code in general. Easier to read
and reason about.
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Add support for parsing option 124 which is Vendor-Identifying Vendor
Class which is defined in https://tools.ietf.org/html/rfc3925.
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