问使用Boost计算ECMA-128 64位CRC

EN

BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) );

// from https://www.boost.org/doc/libs/1_67_0/libs/crc/crc.html#usage
#include <boost/crc.hpp>      // for boost::crc_basic, boost::crc_optimal
#include <boost/cstdint.hpp>  // for boost::uint16_t
#include <algorithm>  // for std::for_each
#include <cassert>    // for assert
#include <cstddef>    // for std::size_t
#include <iostream>   // for std::cout
#include <ostream>    // for std::endl

//#define SHOW_ERROR

#if defined( SHOW_ERROR )
#define CRC ecma_crc // expected
#else 
#define CRC other_crc // actually received
#endif

int main()
{
    // This is "123456789" in ASCII
    unsigned char const  data[] = {0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39};
    std::size_t const    data_len = sizeof(data) / sizeof(data[0]);

    // The expected CRC for the given data
    boost::uint16_t const  expected = 0x29B1;
    // Expected CRCs for "123456789" as per https://www.nitrxgen.net/hashgen/
    long long const  other_crc = 0x9D13A61C0E5B0FF5; // Wolfgang Ehrhardt http://www.wolfgang-ehrhardt.de/crchash_en.html
    long long const  ecma_crc = 0x62EC59E3F1A4F00A; // CRC-64-ECMA-128 https://en.wikipedia.org/wiki/Cyclic_redundancy_check

    // Simulate CRC-CCITT
    boost::crc_basic<16>  crc_ccitt1(0x1021, 0xFFFF, 0, false, false);
    crc_ccitt1.process_bytes(data, data_len);
    assert(crc_ccitt1.checksum() == expected);

    // Repeat with the optimal version (assuming a 16-bit type exists)
    boost::crc_optimal<16, 0x1021, 0xFFFF, 0, false, false>  crc_ccitt2;
    crc_ccitt2 = std::for_each(data, data + data_len, crc_ccitt2);
    assert(crc_ccitt2() == expected);

    // Attempt 64 bit CRC
    boost::crc_basic<64>  crc_64_ecma1(0x42F0E1EBA9EA3693, 0xFFFFFFFFFFFFFFFF, 0, false, false);
    crc_64_ecma1.process_bytes(data, data_len);
    assert(crc_64_ecma1.checksum() == CRC);

    boost::crc_optimal<64, 0x42F0E1EBA9EA3693, 0xFFFFFFFFFFFFFFFF, 0, false, false>  crc_64_ecma2;
    crc_64_ecma2 = std::for_each(data, data + data_len, crc_64_ecma2);
    assert(crc_64_ecma2() == CRC);

    std::cout << "All tests passed." << std::endl;
    return 0;
}