mp3 support for playing background music

tools/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_executable(ddl_ar ddl_ar.cpp ddl_ar_class.cpp)
 add_executable(pcx_diff_tool pcx_diff_tool.c)
+add_executable(deenc deenc.c)
 
 set_property(TARGET ddl_ar PROPERTY CXX_STANDARD 20)

tools/deenc.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <file.ENC>\n", argv[0]);
+        return 1;
+    }
+
+    FILE *f = fopen(argv[1], "rb");
+    if (!f) {
+        perror("Can't open file");
+        return 1;
+    }
+
+    // Získání velikosti souboru
+    fseek(f, 0, SEEK_END);
+    long size = ftell(f);
+    rewind(f);
+
+    // Alokace bufferu
+    unsigned char *data = malloc(size);
+    if (!data) {
+        perror("Memory alloc error");
+        fclose(f);
+        return 1;
+    }
+
+    fread(data, 1, size, f);
+    fclose(f);
+
+    int last=0;
+    for (int i = 0; i < size; ++i) {
+        last = (last + data[i]) & 0xFF;
+        data[i] = last;
+    }
+
+    // Výstup na stdout
+    fwrite(data, 1, size, stdout);
+    free(data);
+
+    return 0;
+}