[PATCH] server: Grow rawinput buffer instead of allocating its maximum size.

[Rémi Bernon]

Call of Duty: WWII call GetRawInputBuffer with very large client buffer,
so the maximum buffer size may be large and it causes an unnecessary
load on wineserver when it allocates and clears the reply buffer.

Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com>
---

I sent another version for this some time ago, but this time I'm only
growing the buffer as needed instead of precomputing the exact required
length.

It is a smaller change and probably more acceptable, and should be
enough to reduce the load, as it is mainly induced by mem_alloc calling
mark_block_uninitialized calls, that is memseting the whole buffer.

 server/queue.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/server/queue.c b/server/queue.c
index ad886a3ba80..e47980a4aa8 100644
--- a/server/queue.c
+++ b/server/queue.c
@@ -3256,12 +3256,11 @@ DECL_HANDLER(get_rawinput_buffer)
     struct thread_input *input = current->queue->input;
     data_size_t size = 0, next_size = 0;
     struct list *ptr;
-    char *buf, *cur;
-    int count = 0;
+    char *buf, *cur, *tmp;
+    int count = 0, buf_size = 16 * sizeof(struct hardware_msg_data);
 
     if (!req->buffer_size) buf = NULL;
-    else if (!(buf = mem_alloc( get_reply_max_size() )))
-        return;
+    else if (!(buf = mem_alloc( buf_size ))) return;
 
     cur = buf;
     ptr = list_head( &input->msg_list );
@@ -3276,6 +3275,17 @@ DECL_HANDLER(get_rawinput_buffer)
         next_size = req->rawinput_size;
         if (size + next_size > req->buffer_size) break;
         if (cur + sizeof(*data) > buf + get_reply_max_size()) break;
+        if (cur + sizeof(*data) > buf + buf_size)
+        {
+            buf_size += buf_size / 2;
+            if (!(tmp = realloc( buf, buf_size )))
+            {
+                set_error( STATUS_NO_MEMORY );
+                return;
+            }
+            cur = tmp + (cur - buf);
+            buf = tmp;
+        }
 
         memcpy(cur, data, sizeof(*data));
         list_remove( &msg->entry );
-- 
2.30.0