ddl_ar tool to work with ddls

tools/ddl_ar.cpp

@@ -0,0 +1,77 @@
+#include  "ddl_ar.h"
+#include  "ddl_ar_class.h"
+#include <iostream>
+
+
+void show_licence_header() {
+std::puts("Copyright (c) 2025 Ondrej Novak. All rights reserved.\n"
+          "This work is licensed under the terms of the MIT license.\n"
+          "For a copy, see <https://opensource.org/licenses/MIT>\n");
+}
+
+void show_short_help() {
+
+    show_licence_header();
+    std::puts("Use -h for help");
+}
+
+void show_help() {
+    show_licence_header();
+    std::puts("ddl_ar -h");
+    std::puts("ddl_ar <file.ddl> -l");
+    std::puts("ddl_ar <file.ddl> -x <files...>");
+    std::puts("");
+    std::puts("-h         this help\n"
+              "file.ddl   input ddl file\n"
+              "-l         list of files\n"
+              "-x         extract files\n");
+}
+
+int main(int argc, char **argv) {
+    if (argc <= 1) {
+        show_short_help();
+        return 1;
+    }
+
+    std::string_view ddl_file = argv[1];
+    if (ddl_file == "-h") {
+        show_help();
+        return 1;
+    }
+
+    if (argc <= 2) {
+        show_short_help();
+        return 1;
+    }
+
+    DDLArchive arch;
+    if (!arch.open(ddl_file)) {
+        std::cerr << "Failed to read ddl file: " << ddl_file;
+        return 1;
+    }
+
+
+    std::string_view swch(argv[2]);
+    if (swch == "-l") {
+        for (const auto &x: arch.get_directory()) {
+            std::puts(x.first.c_str());
+        }
+    } else if (swch == "-x") {
+        std::vector<std::string_view> fls;
+        fls.reserve(argc);
+        for (int i = 3; i < argc; ++i) fls.push_back(argv[i]);
+        arch.extract(fls.begin(), fls.end(), [](const DDLArchive::Extracted &x){
+            if (!x.found) {
+                std::cout << "Not found: " << x.name << "\n";
+            } else {
+                std::ofstream out(std::string(x.name), std::ios::out|std::ios::binary);
+                out.write(x.data.data(), x.data.size());
+                std::cout << "Extracted: " << x.name << " (" << x.data.size() << " bytes)\n";
+            }
+        });
+    } else {
+        std::cerr << "Unknown switch " << swch << std::endl;
+    }
+
+    return 0;
+}