[spice-gtk v3 4/7] Add os_is_64bit utility function

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Allow to know if the system is 64 bit or not.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 src/spice-util-priv.h |  3 +++
 src/spice-util.c      | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/src/spice-util-priv.h b/src/spice-util-priv.h
index 38b0deb..790cc06 100644
--- a/src/spice-util-priv.h
+++ b/src/spice-util-priv.h
@@ -32,6 +32,9 @@ gchar* spice_unix2dos(const gchar *str, gssize len);
 gchar* spice_dos2unix(const gchar *str, gssize len);
 void spice_mono_edge_highlight(unsigned width, unsigned hight,
                                const guint8 *and, const guint8 *xor, guint8 *dest);
+#ifdef G_OS_WIN32
+G_GNUC_INTERNAL gboolean os_is_64bit(void);
+#endif
 
 G_END_DECLS
 
diff --git a/src/spice-util.c b/src/spice-util.c
index 86377b6..7f66d51 100644
--- a/src/spice-util.c
+++ b/src/spice-util.c
@@ -23,6 +23,9 @@
 #include <string.h>
 #include <glib.h>
 #include <glib-object.h>
+#ifdef G_OS_WIN32
+#include <windows.h>
+#endif
 #include <spice/macros.h>
 #include "spice-util-priv.h"
 #include "spice-util.h"
@@ -477,3 +480,42 @@ void spice_mono_edge_highlight(unsigned width, unsigned height,
         xor += bpl;
     }
 }
+
+#ifdef G_OS_WIN32
+/*
+ * Check if current process is running in Wow64 mode
+ * (32 bit on a 64 system)
+ */
+#ifndef _WIN64
+static BOOL is_wow64(void)
+{
+    BOOL bIsWow64 = FALSE;
+
+    typedef BOOL WINAPI IsWow64Process_t(HANDLE, PBOOL);
+    IsWow64Process_t *pIsWow64Process =
+        (IsWow64Process_t *) GetProcAddress(GetModuleHandle("kernel32"), "IsWow64Process");
+
+    if (pIsWow64Process)
+        pIsWow64Process(GetCurrentProcess(), &bIsWow64);
+
+    return bIsWow64;
+}
+#else
+static inline BOOL is_wow64(void)
+{
+    return FALSE;
+}
+#endif
+
+/*
+ * Check if OS is 64 bit
+ */
+gboolean os_is_64bit(void)
+{
+#ifdef _WIN64
+    return TRUE;
+#else
+    return is_wow64() != FALSE;
+#endif
+}
+#endif
-- 
2.7.4

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