refactor all common parts and games

common/util/dll-bind.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stdlib.h>
+
+struct dll_bind_sym {
+    /* Symbol name to locate in the source DLL */
+    const char *sym;
+
+    /* Offset where the symbol pointer should be written in the target
+       structure */
+    ptrdiff_t off;
+};
+
+/*
+    Bind a list of DLL symbols into a structure that contains function
+    pointers.
+
+    - dest: Pointer to destination structure.
+    - src: Handle to source DLL.
+    - syms_pos: Pointer to a (mutable) pointer which points to the start of an
+        (immutable) table of symbols and structure offsets. This mutable
+        pointer is advanced until either a symbol fails to bind, in which case
+        an error is returned, or the end of the table is reached, in which
+        case success is returned.
+   - syms_count: Number of entries in the symbol table.
+*/
+HRESULT dll_bind(
+        void *dest,
+        HINSTANCE src,
+        const struct dll_bind_sym **syms_pos,
+        size_t syms_count);