decode the protobuf field value without the proto file.
input:
the proto data file
output:
key: pb_${field_num}_${sub_field_num}, when field type is array or assambled, the key same as parent field number.
value: decoded value
cmake .
make
./decoder intput_file
test deps: pip install protobuf
sh make.sh : generating protobuf python code by test.proto
python gen.py : generating the name of test_data_pb test proto data
sh cish.sh : run '../decoder test_data_pb' and output decoded fields value