1 files changed, 72 insertions, 0 deletions
diff --git a/test/memory_util_test.cc b/test/memory_util_test.cc
new file mode 100644
index 000000000..43dedb5ce
--- /dev/null
+++ b/test/memory_util_test.cc
@@ -0,0 +1,72 @@
+/*
+    Copyright (C) 2026 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "lib/memory_util.h"
+#include <boost/test/unit_test.hpp>
+
+
+void check(void* p, int size, uint64_t value)
+{
+	uint8_t* up = reinterpret_cast<uint8_t*>(p);
+	for (int i = 0; i < size; ++i) {
+		BOOST_CHECK_EQUAL(*up++, (value >> (i * 8)) & 0xff);
+	}
+}
+
+
+/** Aligned, multiple of 64 size */
+BOOST_AUTO_TEST_CASE(fill_memory_test1)
+{
+	int constexpr size = 256;
+	auto memory = wrapped_av_malloc(size);
+	BOOST_REQUIRE_EQUAL(reinterpret_cast<uintptr_t>(memory) % 8, 0);
+
+	fill_memory(memory, size, 0x1928374654abdfea);
+	check(memory, size, 0x1928374654abdfea);
+}
+
+
+/** Aligned, extra bytes at the end */
+BOOST_AUTO_TEST_CASE(fill_memory_test2)
+{
+	int constexpr size = 259;
+
+	auto memory = wrapped_av_malloc(size);
+	BOOST_REQUIRE_EQUAL(reinterpret_cast<uintptr_t>(memory) % 8, 0);
+
+	fill_memory(memory, size, 0x1928374654abdfea);
+	check(memory, size, 0x1928374654abdfea);
+}
+
+
+/** Non-aligned, extra bytes at start and end */
+BOOST_AUTO_TEST_CASE(fill_memory_test3)
+{
+	int constexpr size = 265;
+
+	auto memory = wrapped_av_malloc(size + 512);
+	BOOST_REQUIRE_EQUAL(reinterpret_cast<uintptr_t>(memory) % 8, 0);
+	memory = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(memory) + 3);
+
+	fill_memory(memory, size, 0x1928374654abdfea);
+	check(memory, size, 0x1928374654abdfea);
+}
+