move stb zlib compressor to extensions folder

openVulkanoCpp/Extensions/STBZlibCompressor.hpp

@@ -0,0 +1,33 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <zlib.h>
+#include <cstdlib>
+
+namespace Extensions
+{
+	static unsigned char* STBZlibCompressor(unsigned char* data, int data_len, int* out_len, int quality)
+	{
+		uLong maxCompressedSize = compressBound(data_len);
+		void* outData = malloc(maxCompressedSize);
+		if (!outData)
+		{
+			*out_len = 0;
+			return nullptr;
+		}
+		int result = compress2(static_cast<Bytef*>(outData), &maxCompressedSize, data, data_len, Z_BEST_COMPRESSION);
+		if (result != Z_OK)
+		{
+			free(outData);
+			*out_len = 0;
+			return nullptr;
+		}
+		*out_len = static_cast<int>(maxCompressedSize);
+		return static_cast<unsigned char*>(outData);
+	}
+}