Introduction

This project aims to use the generated binary file to reverse the packing and generate a C++ array of hexadecimal numbers.

make_dafsa.py in conjunction with prepare_tlds.py is used to generate a C++ hex array when running in firefox build system and a binary file when running with remote-settings-lambdas server.

How to run

Clone this repository.

Compile

$ g++ convert.cpp -o convert

Execute

$ ./convert input.bin output.inc

Files

.
├── convert        // The compiled binary of convert.cpp
├── convert.cpp    // The C++ file to be that is compiled
├── data.py        // I used this while writing the code to reference logic and check that the integers being generated were identical.
├── input.bin      // The input binary file, as created by use of --bin flag in prepare_tlds.py
├── output.inc     // The output file generated with convert.cpp, to compared agaims sample.inc
└── sample.inc     // The output of words_to_cxx when running prepare_tlds.py with no flag, used as reference for judging the correctness of output.inc

Overview of the code

• The binary is read to be stored inside a vector of length set to the the number of packed elements inside the binary.
• The vector is converted into another vector of unsigned integers that has data identical to what is seen before conversion in make_dafsa.py
• This vector is finally converted to hexadecimal numbers(with at least two digits) and formatted to follow correct syntax and incorporate so information.

Conclusion

The convert.cpp produces the correct output as can be verified by by comaparing output.inc with etld_data.inc, they are nearly identical.