enhance: Add util::zstd_* functions

1 files changed, 77 insertions, 0 deletions

diff --git a/unittest/test_util_zstd.cpp b/unittest/test_util_zstd.cpp
new file mode 100644
index 00000000..96250175
--- /dev/null
+++ b/unittest/test_util_zstd.cpp
@@ -0,0 +1,77 @@
+// Copyright (C) 2019-2022 Joel Rosdahl and other contributors
+//
+// See doc/AUTHORS.adoc for a complete list of contributors.
+//
+// This program 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 3 of the License, or (at your option)
+// any later version.
+//
+// This program 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
+// this program; if not, write to the Free Software Foundation, Inc., 51
+// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include <TestUtil.hpp>
+#include <util/Bytes.hpp>
+#include <util/zstd.hpp>
+
+#include <third_party/doctest.h>
+
+#include <string>
+
+using TestUtil::TestContext;
+
+const util::Bytes compressed_ab{
+  0x28, 0xb5, 0x2f, 0xfd, 0x20, 0x02, 0x11, 0x00, 0x00, 0x61, 0x62};
+
+TEST_CASE("util::zstd_compress")
+{
+  TestContext test_context;
+
+  util::Bytes output{'x'};
+  auto result = util::zstd_compress(util::Bytes{'a', 'b'}, output, 1);
+  CHECK(result);
+  CHECK(output.size() == 12);
+  util::Bytes expected{'x'};
+  expected.insert(expected.end(), compressed_ab.begin(), compressed_ab.end());
+  CHECK(output == expected);
+}
+
+TEST_CASE("util::zstd_decompress")
+{
+  TestContext test_context;
+
+  util::Bytes input = compressed_ab;
+  util::Bytes output{'x'};
+  auto result = util::zstd_decompress(input, output, 2);
+  CHECK(result);
+  CHECK(output == util::Bytes{'x', 'a', 'b'});
+}
+
+TEST_CASE("ZSTD roundtrip")
+{
+  TestContext test_context;
+
+  const util::Bytes data{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  const size_t copies = 10000;
+  util::Bytes original_input;
+  for (size_t i = 0; i < copies; i++) {
+    original_input.insert(original_input.end(), data.begin(), data.end());
+  }
+
+  util::Bytes output;
+  auto result = util::zstd_compress(original_input, output, 1);
+  CHECK(result);
+  CHECK(output.size() < 100);
+
+  util::Bytes decompressed_input;
+  result =
+    util::zstd_decompress(output, decompressed_input, copies * data.size());
+  CHECK(result);
+  CHECK(decompressed_input == original_input);
+}