Function _load_map_index

crawl-ref/source/maps.cc:1319–1387

}

static bool _load_map_index(const string& cache, const string &base,
                            time_t mtime)
{
    // If there's a global prelude, load that first.
    if (FILE *fp = fopen_u((base + ".lux").c_str(), "rb"))
    {
        reader inf(fp, TAG_MINOR_VERSION);
        const auto version = get_save_version(inf);
        const auto major = version.major, minor = version.minor;
        int8_t word = unmarshallByte(inf);
        int64_t t = unmarshallSigned(inf);
        if (major != TAG_MAJOR_VERSION || minor > TAG_MINOR_VERSION
            || word != WORD_LEN || t != mtime)
        {
            return false;
        }

#if TAG_MAJOR_VERSION == 34
        // Throw out des cache with bytecode generated under Lua 5.1.
        if (minor < TAG_MINOR_LUA_5_4)
            return false;

#endif
        lc_global_prelude.read(inf);
        fclose(fp);

        global_preludes.push_back(lc_global_prelude);
    }

    FILE* fp = fopen_u((base + ".idx").c_str(), "rb");
    if (!fp)
        end(1, true, "Unable to read %s", (base + ".idx").c_str());

    reader inf(fp, TAG_MINOR_VERSION);
    // Re-check version, might have been modified in the meantime.
    const auto version = get_save_version(inf);
    const auto major = version.major, minor = version.minor;
    int8_t word = unmarshallByte(inf);
    int64_t t = unmarshallSigned(inf);
    if (major != TAG_MAJOR_VERSION || minor > TAG_MINOR_VERSION
        || word != WORD_LEN || t != mtime)
    {
        return false;
    }

#if TAG_MAJOR_VERSION == 34
    // Throw out des cache with bytecode generated under Lua 5.1.
    if (minor < TAG_MINOR_LUA_5_4)
        return false;

#endif
    const int nmaps = unmarshallShort(inf);
    const int nexist = vdefs.size();
    vdefs.resize(nexist + nmaps, map_def());
    for (int i = 0; i < nmaps; ++i)
    {
        map_def &vdef(vdefs[nexist + i]);
        vdef.read_index(inf);