Кодирование сверточным кодом

#include <fstream>
//------------------------------------------------------------------------------
unsigned char encode(const unsigned char c)
{
    return c ^ 0x13;
}
//------------------------------------------------------------------------------
unsigned char decode(const unsigned char c)
{
    return c ^ 0x13;
}
//------------------------------------------------------------------------------
bool encode
(
    std::istream &is, std::ostream &os
)
{
    while (true)
    {
        int c = is.peek();
        if (c == EOF) break;
        is.ignore();
 
        os.put(encode(c));
    }
    return !is.fail() && !os.fail();
}
//------------------------------------------------------------------------------
bool decode
(
    std::istream &is, std::ostream &os
)
{
    while (true)
    {
        int c = is.peek();
        if (c == EOF) break;
        is.ignore();
        
        os.put(decode(c));
    }
    return !is.fail() && !os.fail();
}
//------------------------------------------------------------------------------
void main(void)
{
    std::ifstream src("src.txt", std::ios::binary);
    std::ofstream enc_os("enc.txt", std::ios::binary);
    encode(src, enc_os);
    src.close();
    enc_os.close();
 
    std::ifstream enc_is("enc.txt", std::ios::binary);
    std::ofstream dec("dec.txt", std::ios::binary);
    decode(enc_is, dec);
    enc_is.close();
    dec.close();
}