Most FPGA are using these cores AFAIK, and there is both a GitHub project (already referenced in your other thread) and even a Codeproject article on a somewhat related task to have C code that can program that FPGA from the bitstream.
Reverse-engineering tools for FPGA bitstreams, Altera and Xilinx:
Quote:
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https://github.com/djn3m0/debit
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Convert Xilinx FPGA/CPLD to C Source:
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https://www.codeproject.com/Articles/177990/Convert-Xilinx-FPGA-CPLD-to-C-Source
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