[PATCH v4 2/5] user32: Inform rawinput_from_hardware_message of available buffer size.

[Rémi Bernon]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50506
Signed-off-by: Rémi Bernon 
---
 dlls/user32/message.c  | 1 +
 dlls/user32/rawinput.c | 7 +++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/user32/message.c b/dlls/user32/message.c
index 9af33c3291e..be178072e6f 100644
--- a/dlls/user32/message.c
+++ b/dlls/user32/message.c
@@ -2292,6 +2292,7 @@ static BOOL process_rawinput_message( MSG *msg, UINT hw_id, const struct hardwar

if (msg->message == WM_INPUT)
     {
+        thread_data->buffer->header.dwSize = RAWINPUT_BUFFER_SIZE;
         if (!rawinput_from_hardware_message( thread_data->buffer, msg_data )) return FALSE;
         thread_data->hw_id = hw_id;
         msg->lParam = (LPARAM)hw_id;
diff --git a/dlls/user32/rawinput.c b/dlls/user32/rawinput.c
index 115513ea144..efc736625d5 100644
--- a/dlls/user32/rawinput.c
+++ b/dlls/user32/rawinput.c
@@ -564,7 +564,7 @@ UINT WINAPI DECLSPEC_HOTPATCH GetRawInputBuffer(RAWINPUT *data, UINT *data_size,
     struct hardware_msg_data *msg_data;
     struct rawinput_thread_data *thread_data;
     RAWINPUT *rawinput;
-    UINT count = 0, rawinput_size, next_size, overhead;
+    UINT count = 0, remaining, rawinput_size, next_size, overhead;
     BOOL is_wow64;
     int i;

@@ -617,12 +617,15 @@ UINT WINAPI DECLSPEC_HOTPATCH GetRawInputBuffer(RAWINPUT *data, UINT *data_size,
     }
     SERVER_END_REQ;

+    remaining = *data_size;
     for (i = 0; i < count; ++i)
     {
-        rawinput_from_hardware_message(data, msg_data);
+        data->header.dwSize = remaining;
+        if (!rawinput_from_hardware_message(data, msg_data)) break;
         if (overhead) memmove((char *)&data->data + overhead, &data->data,
                               data->header.dwSize - sizeof(RAWINPUTHEADER));
         data->header.dwSize += overhead;
+        remaining -= data->header.dwSize;
         data = NEXTRAWINPUTBLOCK(data);
         msg_data = (struct hardware_msg_data *)((char *)msg_data + msg_data->size);
     }