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* Refactor command execution into commands moduleRobin Krahl2019-02-18
| | | | | | | | | | | | This patch refactors the command execution. A command is represented by a struct implementing the Command trait. The enum_cmd macro is used to generate a mapping from the CommandId enum to a Command instance and to execute the command. The request and response data is manually converted from and to raw byte slices. As we do not have a standard library, we cannot create a Box<Command> from a CommandId. Instead, we directly delegate the execute method to the corresponding Command.
* Add enum_u8 macro to simplify enum conversionRobin Krahl2019-02-18
We need several enums that map to a u8 value. This patch adds the enum_u8 macro that automatically derives the From and TryFrom macros for an enum to make these conversions easier. As TryFrom is not stable yet, we add our own TryFrom trait.