CRC.cxx

#include "Packing/Utility/CRC.h"
 
#include <algorithm>
#include <boost/crc.hpp>
#include <boost/endian/conversion.hpp>  // IWYU pragma: keep
#include <vector>
 
namespace packing::utility {
 
uint32_t crc32(std::span<const uint32_t> data) {
  std::vector<uint32_t> words{data.begin(), data.end()};
  std::transform(words.begin(), words.end(), words.begin(),
                 [](uint32_t w) { return boost::endian::endian_reverse(w); });
  auto input_ptr = reinterpret_cast<const unsigned char*>(words.data());
  return boost::crc<32, 0x04c11db7, 0x0, 0x0, false, false>(input_ptr,
                                                            words.size() * 4);
}
 
uint8_t econdCrc8(uint64_t data) {
  uint64_t w = boost::endian::endian_reverse(data);
  auto input_ptr = reinterpret_cast<const unsigned char*>(&w);
  /*
   * for future reference:
   * boost::crc<Bits, Poly, Init, XorOut, RefIn, RefOut>
   */
  return boost::crc<8, 0xa7, 0x00, 0x00, false, false>(input_ptr, 8);
}
 
}  // namespace packing::utility