git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/source/util/util_compression.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "lz4.h"
+
+namespace ams::util {
+
+    /* Compression utilities. */
+    int CompressLZ4(void *dst, size_t dst_size, const void *src, size_t src_size) {
+        /* Size checks. */
+        AMS_ASSERT(dst_size <= std::numeric_limits<int>::max());
+        AMS_ASSERT(src_size <= std::numeric_limits<int>::max());
+
+        /* This is just a thin wrapper around LZ4. */
+        return LZ4_compress_default(reinterpret_cast<const char *>(src), reinterpret_cast<char *>(dst), static_cast<int>(src_size), static_cast<int>(dst_size));
+    }
+
+    /* Decompression utilities. */
+    int DecompressLZ4(void *dst, size_t dst_size, const void *src, size_t src_size) {
+        /* Size checks. */
+        AMS_ASSERT(dst_size <= std::numeric_limits<int>::max());
+        AMS_ASSERT(src_size <= std::numeric_limits<int>::max());
+
+        /* This is just a thin wrapper around LZ4. */
+        return LZ4_decompress_safe(reinterpret_cast<const char *>(src), reinterpret_cast<char *>(dst), static_cast<int>(src_size), static_cast<int>(dst_size));
+    }
+
+}