[PATCH v15 02/10] user32: Add NtUserDispatchCallback kernel callback.

[Torge Matthies]

From: Torge Matthies

Signed-off-by: Torge Matthies 
---
 dlls/user32/user_main.c |  8 ++++++++
 dlls/wow64win/user.c    | 28 ++++++++++++++++++++++++++++
 include/ntuser.h        |  8 ++++++++
 3 files changed, 44 insertions(+)

diff --git a/dlls/user32/user_main.c b/dlls/user32/user_main.c
index 15e4796bab2..892f249d249 100644
--- a/dlls/user32/user_main.c
+++ b/dlls/user32/user_main.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */

+#include "ntstatus.h"
+#define WIN32_NO_STATUS
 #include "user_private.h"
 #include "controls.h"
 #include "imm.h"
@@ -199,6 +201,11 @@ static NTSTATUS WINAPI User32UnpackDDEMessage( const struct unpack_dde_message_p
     return TRUE;
 }

+static NTSTATUS WINAPI User32DispatchCallback( const struct user32_callback_params *params, ULONG size )
+{
+    return params->func( (void*)params, size );
+}
+
 static void WINAPI User32CallFreeIcon( ULONG *param, ULONG size )
 {
     if (wow_handlers.call_free_icon)
@@ -231,6 +238,7 @@ static const void *kernel_callback_table[NtUserCallCount] =
     User32PostDDEMessage,
     User32RenderSsynthesizedFormat,
     User32UnpackDDEMessage,
+    User32DispatchCallback,
     User32CallFreeIcon,
     User32ThunkLock,
 };
diff --git a/dlls/wow64win/user.c b/dlls/wow64win/user.c
index 256add62aab..48f34f01a40 100644
--- a/dlls/wow64win/user.c
+++ b/dlls/wow64win/user.c
@@ -328,6 +328,11 @@ struct unpack_dde_message_params32
     char data[1];
 };

+struct user32_callback_params32
+{
+    ULONG func;
+};
+
 static MSG *msg_32to64( MSG *msg, const MSG32 *msg32 )
 {
     if (!msg32) return NULL;
@@ -1008,6 +1013,28 @@ static NTSTATUS WINAPI wow64_NtUserUnpackDDEMessage( void *arg, ULONG size )
     return TRUE;
 }

+static NTSTATUS WINAPI wow64_NtUserDispatchCallback( void *arg, ULONG size )
+{
+    struct user32_callback_params *params = arg;
+    struct user32_callback_params32 *params32;
+    NTSTATUS status;
+    void *ret_ptr;
+    ULONG ret_len;
+
+    size -= sizeof(*params);
+    if (!(params32 = Wow64AllocateTemp( sizeof(*params32) + size )))
+        return 0;
+
+    params32->func = (ULONG)(ULONG_PTR)params->func;
+    if (size) memcpy( params32 + 1, params + 1, size );
+
+    status = Wow64KiUserCallbackDispatcher( NtUserDispatchCallback, params32, size + sizeof(*params32),
+                                            &ret_ptr, &ret_len );
+    params->func = (void*)(ULONG_PTR)params32->func;
+    if (size) memcpy( params + 1, params32 + 1, size );
+    return NtCallbackReturn( ret_ptr, ret_len, status );
+}
+
 static NTSTATUS WINAPI wow64_NtUserCallFreeIcon( void *arg, ULONG size )
 {
     return dispatch_callback( NtUserCallFreeIcon, arg, size );
@@ -1108,6 +1135,7 @@ user_callback user_callbacks[] =
     wow64_NtUserPostDDEMessage,
     wow64_NtUserRenderSynthesizedFormat,
     wow64_NtUserUnpackDDEMessage,
+    wow64_NtUserDispatchCallback,
     /* win16 hooks */
     wow64_NtUserCallFreeIcon,
     wow64_NtUserThunkLock,
diff --git a/include/ntuser.h b/include/ntuser.h
index 5331b3d7400..081056d6384 100644
--- a/include/ntuser.h
+++ b/include/ntuser.h
@@ -47,6 +47,7 @@ enum
     NtUserPostDDEMessage,
     NtUserRenderSynthesizedFormat,
     NtUserUnpackDDEMessage,
+    NtUserDispatchCallback,
     /* win16 hooks */
     NtUserCallFreeIcon,
     NtUserThunkLock,
@@ -270,6 +271,13 @@ struct unpack_dde_message_params
     char data[1];
 };

+typedef NTSTATUS (WINAPI *user32_callback_func)( void *args, ULONG len );
+
+struct user32_callback_params
+{
+    user32_callback_func func;
+};
+
 /* process DPI awareness contexts */
 #define NTUSER_DPI_UNAWARE                0x00006010
 #define NTUSER_DPI_SYSTEM_AWARE           0x00006011