--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDL3/SDL_test_crc32.h	Mon Jan 05 02:15:46 2026 -0500
@@ -0,0 +1,121 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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.
+*/
+
+/**
+ *  CRC32 functions of SDL test framework.
+ *
+ *  This code is a part of the SDL 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 <SDL3/SDL_stdinc.h>
+
+#include <SDL3/SDL_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 SDLTest_Crc32Context {
+    CrcUint32    crc32_table[256]; /* CRC table */
+  } SDLTest_Crc32Context;
+
+/* ---------- Function Prototypes ------------- */
+
+/*
+ * Initialize the CRC context
+ *
+ * Note: The function initializes the crc table required for all crc calculations.
+ *
+ * \param crcContext        pointer to context variable
+ *
+ * \returns true on success or false on failure; call SDL_GetError()
+ *          for more information.
+ *
+ */
+bool SDLCALL SDLTest_Crc32Init(SDLTest_Crc32Context *crcContext);
+
+/*
+ * 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 true on success or false on failure; call SDL_GetError()
+ *          for more information.
+ *
+ */
+bool SDLCALL SDLTest_Crc32Calc(SDLTest_Crc32Context *crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
+
+/* Same routine broken down into three steps */
+bool SDLCALL SDLTest_Crc32CalcStart(SDLTest_Crc32Context *crcContext, CrcUint32 *crc32);
+bool SDLCALL SDLTest_Crc32CalcEnd(SDLTest_Crc32Context *crcContext, CrcUint32 *crc32);
+bool SDLCALL SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context *crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
+
+/*
+ * clean up CRC context
+ *
+ * \param crcContext        pointer to context variable
+ *
+ * \returns true on success or false on failure; call SDL_GetError()
+ *          for more information.
+ *
+*/
+
+bool SDLCALL SDLTest_Crc32Done(SDLTest_Crc32Context *crcContext);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include <SDL3/SDL_close_code.h>
+
+#endif /* SDL_test_crc32_h_ */