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diff --git a/3rdparty/include/SDL2/SDL_test_md5.h b/3rdparty/include/SDL2/SDL_test_md5.h
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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 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.
+*/
+
+/**
+ *  \file SDL_test_md5.h
+ *
+ *  Include file for SDL test framework.
+ *
+ *  This code is a part of the SDL2_test library, not the main SDL library.
+ */
+
+/*
+ ***********************************************************************
+ ** Header file for implementation of MD5                             **
+ ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
+ ** Created: 2/17/90 RLR                                              **
+ ** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version               **
+ ** Revised (for MD5): RLR 4/27/91                                    **
+ **   -- G modified to have y&~z instead of y&z                       **
+ **   -- FF, GG, HH modified to add in last register done             **
+ **   -- Access pattern: round 2 works mod 5, round 3 works mod 3     **
+ **   -- distinct additive constant for each step                     **
+ **   -- round 4 added, working mod 7                                 **
+ ***********************************************************************
+*/
+
+/*
+ ***********************************************************************
+ **  Message-digest routines:                                         **
+ **  To form the message digest for a message M                       **
+ **    (1) Initialize a context buffer mdContext using MD5Init        **
+ **    (2) Call MD5Update on mdContext and M                          **
+ **    (3) Call MD5Final on mdContext                                 **
+ **  The message digest is now in mdContext->digest[0...15]           **
+ ***********************************************************************
+*/
+
+#ifndef SDL_test_md5_h_
+#define SDL_test_md5_h_
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ------------ Definitions --------- */
+
+/* typedef a 32-bit type */
+  typedef unsigned long int MD5UINT4;
+
+/* Data structure for MD5 (Message-Digest) computation */
+  typedef struct {
+    MD5UINT4  i[2];     /* number of _bits_ handled mod 2^64 */
+    MD5UINT4  buf[4];       /* scratch buffer */
+    unsigned char in[64];   /* input buffer */
+    unsigned char digest[16];   /* actual digest after Md5Final call */
+  } SDLTest_Md5Context;
+
+/* ---------- Function Prototypes ------------- */
+
+/**
+ * \brief initialize the context
+ *
+ * \param  mdContext        pointer to context variable
+ *
+ * Note: The function initializes the message-digest context
+ *       mdContext. Call before each new use of the context -
+ *       all fields are set to zero.
+ */
+ void SDLTest_Md5Init(SDLTest_Md5Context * mdContext);
+
+
+/**
+ * \brief update digest from variable length data
+ *
+ * \param  mdContext       pointer to context variable
+ * \param  inBuf           pointer to data array/string
+ * \param  inLen           length of data array/string
+ *
+ * Note: The function updates the message-digest context to account
+ *       for the presence of each of the characters inBuf[0..inLen-1]
+ *       in the message whose digest is being computed.
+*/
+
+ void SDLTest_Md5Update(SDLTest_Md5Context * mdContext, unsigned char *inBuf,
+                 unsigned int inLen);
+
+
+/**
+ * \brief complete digest computation
+ *
+ * \param mdContext     pointer to context variable
+ *
+ * Note: The function terminates the message-digest computation and
+ *       ends with the desired message digest in mdContext.digest[0..15].
+ *       Always call before using the digest[] variable.
+*/
+
+ void SDLTest_Md5Final(SDLTest_Md5Context * mdContext);
+
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_test_md5_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */