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diff --git a/source/3rd-party/SDL2/src/SDL_dataqueue.h b/source/3rd-party/SDL2/src/SDL_dataqueue.h
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+++ b/source/3rd-party/SDL2/src/SDL_dataqueue.h
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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#ifndef SDL_dataqueue_h_
+#define SDL_dataqueue_h_
+
+/* this is not (currently) a public API. But maybe it should be! */
+
+struct SDL_DataQueue;
+typedef struct SDL_DataQueue SDL_DataQueue;
+
+SDL_DataQueue *SDL_NewDataQueue(const size_t packetlen, const size_t initialslack);
+void SDL_FreeDataQueue(SDL_DataQueue *queue);
+void SDL_ClearDataQueue(SDL_DataQueue *queue, const size_t slack);
+int SDL_WriteToDataQueue(SDL_DataQueue *queue, const void *data, const size_t len);
+size_t SDL_ReadFromDataQueue(SDL_DataQueue *queue, void *buf, const size_t len);
+size_t SDL_PeekIntoDataQueue(SDL_DataQueue *queue, void *buf, const size_t len);
+size_t SDL_CountDataQueue(SDL_DataQueue *queue);
+
+/* this sets a section of the data queue aside (possibly allocating memory for it)
+   as if it's been written to, but returns a pointer to that space. You may write
+   to this space until a read would consume it. Writes (and other calls to this
+   function) will safely append their data after this reserved space and can
+   be in flight at the same time. There is no thread safety.
+   If there isn't an existing block of memory that can contain the reserved
+   space, one will be allocated for it. You can not (currently) allocate
+   a space larger than the packetlen requested in SDL_NewDataQueue.
+   Returned buffer is uninitialized.
+   This lets you avoid an extra copy in some cases, but it's safer to use
+   SDL_WriteToDataQueue() unless you know what you're doing.
+   Returns pointer to buffer of at least (len) bytes, NULL on error.
+*/
+void *SDL_ReserveSpaceInDataQueue(SDL_DataQueue *queue, const size_t len);
+
+#endif /* SDL_dataqueue_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
+