Function BuildPakFile

dev/src/compiler.cpp:199–287

template <typename T> int64_t LE(T x) { return flatbuffers::EndianScalar((int64_t)x); };

string BuildPakFile(string &pakfile, string &metadata_buffer, set<string> &files, uint64_t src_hash,
                    const string &c_codegen) {
    // All offsets in 64bit, just in-case we ever want pakfiles > 4GB :)
    // Since we're building this in memory, they can only be created by a 64bit build.
    vector<int64_t> filestarts;
    vector<int64_t> namestarts;
    vector<int64_t> uncompressed;
    vector<string> filenames;
    auto add_file = [&](string_view buf, string_view filename) {
        filestarts.push_back(LE(pakfile.size()));
        filenames.push_back(string(filename));
        LOG_INFO("adding to pakfile: ", filename);
        if (IsCompressed(filename)) {
            string out;
            WEntropyCoder<true>((uint8_t *)buf.data(), buf.length(), buf.length(), out);
            pakfile += out;
            uncompressed.push_back(buf.length());
        } else {
            pakfile += buf;
            uncompressed.push_back(-1);
        }
    };
    // Start with a magic id, just for the hell of it.
    pakfile.insert(pakfile.end(), magic, magic + magic_size);
    // Metadata always first entry.
    add_file(metadata_buffer, mdname);
    if (!c_codegen.empty()) {
        add_file(c_codegen, ccname);
    }
    // Followed by all files.
    files.insert("data/shaders/default.materials");  // If it hadn't already been added.
    string buf;
    function<string(const string &)> addrec;
    addrec = [&](const string &filename) -> string {
        auto l = LoadFile(filename, &buf);
        if (l >= 0) {
            add_file(buf, filename);
        } else {
            auto base = filename;
            auto pat = string{};
            auto pos = filename.find("#");
            if (pos != filename.npos) {
                pat = filename.substr(pos + 1);
                base = filename.substr(0, pos);
            }
            vector<DirectoryInfo> dir;
            if (!ScanDir(base, dir)) return "cannot load file/dir for pakfile: " + filename;
            for (auto &entry : dir) {
                if (!pat.empty() && entry.name.find(pat) == entry.name.npos) continue;
                auto fn = base;
                if (fn.back() != '/') fn += "/";
                fn += entry.name;
                auto err = addrec(fn);
                if (!err.empty()) return err;
            }
        }
        return "";
    };