#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>

int main(int argc, char* argv[]) {
    if (argc < 3) {
        std::cerr << "Usage: " << argv[0] << " <inputfile> <outputfile>\n";
        return 1;
    }

    // --- Read entire file into memory ---
    std::ifstream infile(argv[1], std::ios::binary);
    if (!infile) {
        std::cerr << "Error opening input file.\n";
        return 1;
    }

    std::vector<char> buffer((std::istreambuf_iterator<char>(infile)),
                             std::istreambuf_iterator<char>());
    infile.close();

    if (buffer.empty()) {
        std::cerr << "Input file is empty.\n";
        return 1;
    }

    // --- 1. Remove all ASCII 155 (0x9B) bytes ---
    buffer.erase(std::remove(buffer.begin(), buffer.end(), (char)155), buffer.end());

    // --- 2. Remove form feed (ASCII 12) from the last 16 bytes only ---
    if (!buffer.empty()) {
        size_t start = (buffer.size() > 16) ? buffer.size() - 16 : 0;
        buffer.erase(std::remove(buffer.begin() + start, buffer.end(), (char)12), buffer.end());
    }

    // --- 3. Remove one space (ASCII 32) at start of final line ---
    if (!buffer.empty()) {
        // Find position of last newline character ('\n' or '\r')
        size_t last_line_start = 0;
        for (size_t i = buffer.size(); i-- > 0; ) {
            if (buffer[i] == '\n') {
                last_line_start = i + 1;
                break;
            }
        }

        // If first character of last line is a space (0x20), remove one
        if (last_line_start < buffer.size() && buffer[last_line_start] == ' ') {
            buffer.erase(buffer.begin() + last_line_start);
        }
    }

    // --- Write output file ---
    std::ofstream outfile(argv[2], std::ios::binary);
    if (!outfile) {
        std::cerr << "Error opening output file.\n";
        return 1;
    }

    outfile.write(buffer.data(), buffer.size());
    outfile.close();

    return 0;
}