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diff --git a/3rdparty/include/SDL2/SDL_test_crc32.h b/3rdparty/include/SDL2/SDL_test_crc32.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_crc32.h
+ *
+ * Include file for SDL test framework.
+ *
+ * This code is a part of the SDL2_test library, not the main SDL library.
+ */
+
+/*
+
+ Implements CRC32 calculations (default output is Perl String::CRC32 compatible).
+
+*/
+
+#ifndef SDL_test_crc32_h_
+#define SDL_test_crc32_h_
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* ------------ Definitions --------- */
+
+/* Definition shared by all CRC routines */
+
+#ifndef CrcUint32
+ #define CrcUint32 unsigned int
+#endif
+#ifndef CrcUint8
+ #define CrcUint8 unsigned char
+#endif
+
+#ifdef ORIGINAL_METHOD
+ #define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
+#else
+ #define CRC32_POLY 0xEDB88320 /* Perl String::CRC32 compatible */
+#endif
+
+/**
+ * Data structure for CRC32 (checksum) computation
+ */
+ typedef struct {
+ CrcUint32 crc32_table[256]; /* CRC table */
+ } SDLTest_Crc32Context;
+
+/* ---------- Function Prototypes ------------- */
+
+/**
+ * \brief Initialize the CRC context
+ *
+ * Note: The function initializes the crc table required for all crc calculations.
+ *
+ * \param crcContext pointer to context variable
+ *
+ * \returns 0 for OK, -1 on error
+ *
+ */
+ int SDLTest_Crc32Init(SDLTest_Crc32Context * crcContext);
+
+
+/**
+ * \brief calculate a crc32 from a data block
+ *
+ * \param crcContext pointer to context variable
+ * \param inBuf input buffer to checksum
+ * \param inLen length of input buffer
+ * \param crc32 pointer to Uint32 to store the final CRC into
+ *
+ * \returns 0 for OK, -1 on error
+ *
+ */
+int SDLTest_Crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
+
+/* Same routine broken down into three steps */
+int SDLTest_Crc32CalcStart(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32);
+int SDLTest_Crc32CalcEnd(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32);
+int SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
+
+
+/**
+ * \brief clean up CRC context
+ *
+ * \param crcContext pointer to context variable
+ *
+ * \returns 0 for OK, -1 on error
+ *
+*/
+
+int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext);
+
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_test_crc32_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */