CLOUD: Add Storage::uploadStreamSupported()

Box uses POST multipart/form requests for uploading. Such requests could
be sent with libcurl if we either have a file available or a buffer with
this file's contents.

SavesSyncRequest was using Storage::upload(ReadStream *), which couldn't
be implemented in BoxStorage. Thus I've added a method to test whether
such upload is supported and, if it's not, SavesSyncRequest uses the
other.

1 files changed, 4 insertions, 0 deletions

diff --git a/backends/cloud/storage.cpp b/backends/cloud/storage.cpp
index 2cf851f3ba..110c97ad9c 100644
--- a/backends/cloud/storage.cpp
+++ b/backends/cloud/storage.cpp
@@ -85,6 +85,10 @@ Networking::Request *Storage::upload(Common::String remotePath, Common::String l
 	return upload(remotePath, f, callback, errorCallback);
 }
 
+bool Storage::uploadStreamSupported() {
+	return true;
+}
+
 Networking::Request *Storage::streamFile(Common::String path, Networking::NetworkReadStreamCallback callback, Networking::ErrorCallback errorCallback) {
 	//most Storages use paths instead of ids, so this should work
 	return streamFileById(path, callback, errorCallback);