Question

I cannot use strstr, memchr because array can contains any number of \0 chars, is there are any efficient ways to do that? I have to find all positions (indexes) or pointers.

Answer 1

Piece of cake in C++:

#include <string>

const std::string needle = get_byte_sequence();
const std::string haystack = get_data();


std::size_t pos = haystack.find(needle);

// found if pos != std::string::npos

Another option is to use a generic algorithm:

#include <algorithm>

std::string::const_iterator it = std::search(data.begin(), data.end(), needle.begin(), needle.end());

if (it != data.end())
{
  // needle found at position std::distance(data.begin(), it);
}
else
{
  // needle not found
}

Bear in mind that C++ string objects can contain arbitrary data. To create a string from a byte buffer, pass its size to the constructor:

char buf[200];   // fill with your data; possibly full of zeros!

std::string s(buf, 200); // no problem