Function MachineIdToPlayerId

engine/Poseidon/Network/MultiplayerAuth.cpp:23–53

namespace Poseidon
{
uint64_t MachineIdToPlayerId(const char* rawMachineId)
{
    if (!rawMachineId)
        return 0;

    // Trim surrounding whitespace (the /etc/machine-id file carries a trailing
    // newline; the id must be identical with or without it).
    const char* begin = rawMachineId;
    while (*begin != 0 && static_cast<unsigned char>(*begin) <= ' ')
        ++begin;
    const char* end = begin + strlen(begin);
    while (end > begin && static_cast<unsigned char>(*(end - 1)) <= ' ')
        --end;
    if (end == begin)
        return 0;

    // FNV-1a 64-bit over the trimmed bytes.
    uint64_t hash = 1469598103934665603ULL;
    for (const char* p = begin; p < end; ++p)
    {
        hash ^= static_cast<unsigned char>(*p);
        hash *= 1099511628211ULL;
    }

    // Mask to 63 bits so the value is a positive signed int64 (the _atoi64 /
    // decimal ban.txt contract). Steer clear of the server's 0/999 sentinels.
    hash &= 0x7FFFFFFFFFFFFFFFULL;
    if (hash == 0 || hash == 999)
        hash = 1;
    return hash;
}

RString ReadOsMachineId()
{