Merge commit 'a2059eea4ad3021eb6a90959eea1edddc57e249d' as 'external/parallel-rdp/parallel-rdp-standalone'

external/parallel-rdp/parallel-rdp-standalone/util/aligned_alloc.cpp

@@ -0,0 +1,83 @@
+/* Copyright (c) 2017-2023 Hans-Kristian Arntzen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "aligned_alloc.hpp"
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef _WIN32
+#include <malloc.h>
+#endif
+
+namespace Util
+{
+void *memalign_alloc(size_t boundary, size_t size)
+{
+#if defined(_WIN32)
+    return _aligned_malloc(size, boundary);
+#elif defined(_ISOC11_SOURCE)
+    return aligned_alloc(boundary, (size + boundary - 1) & ~(boundary - 1));
+#elif (_POSIX_C_SOURCE >= 200112L) || (_XOPEN_SOURCE >= 600)
+	void *ptr = nullptr;
+	if (posix_memalign(&ptr, boundary, size) < 0)
+		return nullptr;
+	return ptr;
+#else
+    // Align stuff ourselves. Kinda ugly, but will work anywhere.
+    void **place;
+    uintptr_t addr = 0;
+    void *ptr = malloc(boundary + size + sizeof(uintptr_t));
+
+    if (ptr == nullptr)
+        return nullptr;
+
+    addr = ((uintptr_t)ptr + sizeof(uintptr_t) + boundary) & ~(boundary - 1);
+    place = (void **) addr;
+    place[-1] = ptr;
+
+    return (void *) addr;
+#endif
+}
+
+void *memalign_calloc(size_t boundary, size_t size)
+{
+    void *ret = memalign_alloc(boundary, size);
+    if (ret)
+        memset(ret, 0, size);
+    return ret;
+}
+
+void memalign_free(void *ptr)
+{
+#if defined(_WIN32)
+    _aligned_free(ptr);
+#elif !defined(_ISOC11_SOURCE) && !((_POSIX_C_SOURCE >= 200112L) || (_XOPEN_SOURCE >= 600))
+    if (ptr != nullptr)
+    {
+        void **p = (void **) ptr;
+        free(p[-1]);
+    }
+#else
+    free(ptr);
+#endif
+}
+}