Question

I want to use boost::crc so that it works exactly like PHP’s crc32() function. I tried reading the horrible documentation and many headaches later I haven’t made any progress.

Apparently I have to do something like:

int GetCrc32(const string& my_string) {
    return crc_32 = boost::crc<bits, TruncPoly, InitRem, FinalXor,
                   ReflectIn, ReflectRem>(my_string.c_str(), my_string.length());
}

bits should be 32.. What the other things are is a mystery. A little help? 😉

Answer 1

Dan Story and ergosys provided good answers (apparently I was looking in the wrong place, that’s why the headaches) but while I’m at it I wanted to provide a copy&paste solution for the function in my question for future googlers:

#include <boost/crc.hpp>

uint32_t GetCrc32(const string& my_string) {
    boost::crc_32_type result;
    result.process_bytes(my_string.data(), my_string.length());
    return result.checksum();
}