• Varint for u64
• Len for String

It has two lib modules

• deserialize (convert from binary hex value to on of the supported variants, which will have contain the field-number and the value)
• serialize (convert a type that implements Proto into binary protobuf message hex-value)

For more information about the Encoding rules refer to the (official documentation)[https://protobuf.dev/programming-guides/encoding/]

For installation and usage documentation of protoscope refer the (protoscope github repo)[https://github.com/protocolbuffers/protoscope/] (As an alternative, in-browser tool see (protobufpal)[https://www.protobufpal.com/])

• write a pseudo message into file

  echo '1: 42' > msg.txt
  echo '2: {"Foo"}' >> msg.txt
  

• convert to binary

  protoscope -s msg.txt > msg.bin
  # look at hex value
  xxd msg.bin
  

• to go from bin to message

  protoscope msg.bin
  
  

• Support other wire types (other VARINTs like bool, signed numbers, repeated types, nexted types etc.)
• Implement derive-macro for Proto (at least on structs), which internally converts every field to it's WireType equivalent and calls serialize on it.