libxrdp: send, get, and use multi fragment max caps

common/xrdp_client_info.h

@@ -121,6 +121,8 @@ struct xrdp_client_info
   int mcs_connection_type;
   int mcs_early_capability_flags;
 
+  int max_fastpath_frag_bytes;
+
 };
 
 #endif

libxrdp/xrdp_caps.c

@@ -455,6 +455,10 @@ static int APP_CC
 xrdp_caps_process_multifragmetupdate(struct xrdp_rdp *self, struct stream *s,
                                      int len)
 {
+    int MaxRequestSize;
+
+    in_uint32_le(s, MaxRequestSize);
+    self->client_info.max_fastpath_frag_bytes = MaxRequestSize;
     return 0;
 }
 
@@ -821,6 +825,14 @@ xrdp_caps_send_demand_active(struct xrdp_rdp *self)
     out_uint16_le(s, 5);
     out_uint8(s, 0); /* client sets */
 
+    if (self->client_info.use_fast_path & 1) /* fastpath output on */
+    {
+        caps_count++;
+        out_uint16_le(s, 0x001A); /* 26 CAPSETTYPE_MULTIFRAGMENTUPDATE */
+        out_uint16_le(s, 8);
+        out_uint32_le(s, 3 * 1024 * 1024); /* 3MB */
+    }
+
     out_uint8s(s, 4); /* pad */
 
     s_mark_end(s);

libxrdp/xrdp_fastpath.c

@@ -101,7 +101,14 @@ xrdp_fastpath_recv(struct xrdp_fastpath *self, struct stream *s)
 int APP_CC
 xrdp_fastpath_init(struct xrdp_fastpath *self, struct stream *s)
 {
-    init_stream(s, 32 * 1024);
+    int bytes;
+
+    bytes = self->session->client_info->max_fastpath_frag_bytes;
+    if (bytes < 32 * 1024)
+    {
+        bytes = 32 * 1024;
+    }
+    init_stream(s, bytes);
     return 0;
 }