#include "processes.hpp"

Rabin_fingerprint_process::Rabin_fingerprint_process(uint32_t irr_poly, size_t window_size_in_bits)
    : window_size_in_bits(window_size_in_bits),
      phi(irr_poly, window_size_in_bits)
{}

void Rabin_fingerprint_process::stream_char (char c) {
    std::bitset<8> b(c);
    for (char i = 7; i >= 0; i--) {
        stream_bit((bool)b[i]);
    }
}

void Rabin_fingerprint_process::stream_bit (bool b) {
    if (window.size() == window_size_in_bits) {
        window.push(b);
        bool b_out = window.front();
        window.pop();
        phi.slide_bit(b, b_out);
    } else {
        window.push(b);
        phi.push_bit(b);
    }
}

uint32_t Rabin_fingerprint_process::get_fingerprint () {
    return phi.get_fingerprint();
}