Initial Commit

platform/misc.c

@@ -0,0 +1,106 @@
+#include <windows.h>
+
+#include <winuser.h>
+#include <assert.h>
+#include <stdint.h>
+
+#include "hook/table.h"
+
+#include "platform/misc.h"
+
+#include "util/dprintf.h"
+
+// BlockInput
+// ShowCursor
+static BOOL WINAPI my_BlockInput(BOOL fBlockIt);
+static int WINAPI my_ShowCursor(BOOL bShow);
+static BOOL WINAPI my_GetCursorInfo(PCURSORINFO pci);
+
+static BOOL (WINAPI *next_BlockInput)(BOOL fBlockIt);
+static int (WINAPI *next_ShowCursor)(BOOL bShow);
+static BOOL (WINAPI *next_GetCursorInfo)(PCURSORINFO pci);
+
+BOOL block_input_hook = true;
+BOOL show_cursor_hook = true;
+int real_cursor_state = 0;
+
+static const struct hook_symbol misc_hook_syms[] = {
+    {
+        .name   = "BlockInput",
+        .patch  = my_BlockInput,
+        .link   = (void **) &next_BlockInput,
+    }, {
+        .name   = "ShowCursor",
+        .patch  = my_ShowCursor,
+        .link   = (void **) &next_ShowCursor,
+    }, {
+        .name   = "GetCursorInfo",
+        .patch  = my_GetCursorInfo,
+        .link   = (void **) &next_GetCursorInfo,
+    }
+};
+
+HRESULT misc_hook_init(const struct misc_config *cfg)
+{
+    assert(cfg != NULL);
+
+    show_cursor_hook = cfg->show_cursor_hook;
+    block_input_hook = cfg->block_input_hook;
+
+    dprintf("Misc: init\n");
+
+    hook_table_apply(
+                NULL,
+                "User32.dll",
+                misc_hook_syms,
+                _countof(misc_hook_syms));
+    
+    return S_OK;
+}
+
+static BOOL WINAPI my_BlockInput(BOOL fBlockIt)
+{
+    if (!block_input_hook) {
+        return next_BlockInput(fBlockIt);
+    }
+
+    dprintf("Misc: Block BlockInput -> %d\n", fBlockIt);
+
+    return true;
+}
+
+static int WINAPI my_ShowCursor(BOOL bShow)
+{
+    if (!show_cursor_hook) {
+        return next_ShowCursor(bShow);
+    }
+
+    dprintf("Misc: Block ShowCursor -> %d\n", bShow);
+
+    // Keep track for GetCursorInfo
+    if (bShow) {
+        return ++real_cursor_state;
+    } else {
+        return --real_cursor_state;
+    }
+}
+
+static BOOL WINAPI my_GetCursorInfo(PCURSORINFO pci)
+{
+    if (!show_cursor_hook) {
+        return next_GetCursorInfo(pci);
+    }
+
+    // Game only seems to read the flags field, 
+    // so that's all we'll mess with
+
+    dprintf("Misc: my_GetCursorInfo\n");
+
+    if (real_cursor_state >= 0) {
+        pci->flags = CURSOR_SHOWING;
+    } else {
+        pci->flags = 0;
+    }
+
+    return true;
+}