htc: fixes for WriteFileLarge/sending over data channel

libraries/libstratosphere/source/htclow/mux/htclow_mux_channel_impl.cpp

@@ -465,6 +465,9 @@ namespace ams::htclow::mux {
 
         /* Set max packet size. */
         m_send_buffer.SetMaxPacketSize(max_packet_size);
+
+        /* Set our total send size. */
+        m_total_send_size = buf_size;
     }
 
 }

libraries/libstratosphere/source/htclow/mux/htclow_mux_send_buffer.cpp

@@ -93,7 +93,7 @@ namespace ams::htclow::mux {
 
         /* Determine the sendable size. */
         const auto offset = total_send_size - ring_buffer_data_size;
-        const auto sendable_size = std::min(share - offset, ring_buffer_data_size);
+        const auto sendable_size = m_flow_control_enabled ? std::min(share - offset, ring_buffer_data_size) : ring_buffer_data_size;
         if (sendable_size == 0) {
             return false;
         }