1 files changed, 166 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/test/SDL_test_crc32.c b/Source/external/SDL2/src/test/SDL_test_crc32.c
new file mode 100644
index 0000000..ea6b0a8
--- /dev/null
+++ b/Source/external/SDL2/src/test/SDL_test_crc32.c
@@ -0,0 +1,166 @@
+/*
+  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.
+*/
+
+/*
+
+ Used by the test execution component.
+ Original source code contributed by A. Schiffler for GSOC project.
+
+*/
+
+#include "SDL_config.h"
+
+#include "SDL_test.h"
+
+
+int SDLTest_Crc32Init(SDLTest_Crc32Context *crcContext)
+{
+  int i,j;
+  CrcUint32 c;
+
+  /* Sanity check context pointer */
+  if (crcContext==NULL) {
+   return -1;
+  }
+
+  /*
+   * Build auxiliary table for parallel byte-at-a-time CRC-32
+   */
+#ifdef ORIGINAL_METHOD
+  for (i = 0; i < 256; ++i) {
+    for (c = i << 24, j = 8; j > 0; --j) {
+      c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c << 1);
+    }
+    crcContext->crc32_table[i] = c;
+  }
+#else
+  for (i=0; i<256; i++) {
+   c = i;
+   for (j=8; j>0; j--) {
+    if (c & 1) {
+     c = (c >> 1) ^ CRC32_POLY;
+    } else {
+     c >>= 1;
+    }
+   }
+   crcContext->crc32_table[i] = c;
+  }
+#endif
+
+  return 0;
+}
+
+/* Complete CRC32 calculation on a memory block */
+int SDLTest_Crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32)
+{
+  if (SDLTest_Crc32CalcStart(crcContext,crc32)) {
+   return -1;
+  }
+
+  if (SDLTest_Crc32CalcBuffer(crcContext, inBuf, inLen, crc32)) {
+   return -1;
+  }
+
+  if (SDLTest_Crc32CalcEnd(crcContext, crc32)) {
+   return -1;
+  }
+
+  return 0;
+}
+
+/* Start crc calculation */
+
+int SDLTest_Crc32CalcStart(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32)
+{
+  /* Sanity check pointers */
+  if (crcContext==NULL) {
+   *crc32=0;
+   return -1;
+  }
+
+  /*
+   * Preload shift register, per CRC-32 spec
+   */
+  *crc32 = 0xffffffff;
+
+  return 0;
+}
+
+/* Finish crc calculation */
+
+int SDLTest_Crc32CalcEnd(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32)
+{
+  /* Sanity check pointers */
+  if (crcContext==NULL) {
+   *crc32=0;
+   return -1;
+  }
+
+  /*
+   * Return complement, per CRC-32 spec
+   */
+  *crc32 = (~(*crc32));
+
+  return 0;
+}
+
+/* Include memory block in crc */
+
+int SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32)
+{
+  CrcUint8    *p;
+  register CrcUint32    crc;
+
+  if (crcContext==NULL) {
+   *crc32=0;
+   return -1;
+  }
+
+  if (inBuf==NULL) {
+   return -1;
+  }
+
+  /*
+   * Calculate CRC from data
+   */
+  crc = *crc32;
+  for (p = inBuf; inLen > 0; ++p, --inLen) {
+#ifdef ORIGINAL_METHOD
+    crc = (crc << 8) ^ crcContext->crc32_table[(crc >> 24) ^ *p];
+#else
+    crc = ((crc >> 8) & 0x00FFFFFF) ^ crcContext->crc32_table[ (crc ^ *p) & 0xFF ];
+#endif
+  }
+  *crc32 = crc;
+
+  return 0;
+}
+
+int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext)
+{
+  if (crcContext==NULL) {
+     return -1;
+  }
+
+  return 0;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */