From 86f6b6b7b2d930e8203114332b04a5c49a780b06 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Thu, 10 Aug 2023 21:34:43 -0400
Subject: vfs: expand support for NCA reading

---
 .../fssystem_compression_configuration.cpp         | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 src/core/file_sys/fssystem/fssystem_compression_configuration.cpp

(limited to 'src/core/file_sys/fssystem/fssystem_compression_configuration.cpp')

diff --git a/src/core/file_sys/fssystem/fssystem_compression_configuration.cpp b/src/core/file_sys/fssystem/fssystem_compression_configuration.cpp
new file mode 100644
index 000000000..8734f84ca
--- /dev/null
+++ b/src/core/file_sys/fssystem/fssystem_compression_configuration.cpp
@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/lz4_compression.h"
+#include "core/file_sys/fssystem/fssystem_compression_configuration.h"
+
+namespace FileSys {
+
+namespace {
+
+Result DecompressLz4(void* dst, size_t dst_size, const void* src, size_t src_size) {
+    auto result = Common::Compression::DecompressLZ4(dst, dst_size, src, src_size);
+    R_UNLESS(static_cast<size_t>(result) == dst_size, ResultUnexpectedInCompressedStorageC);
+    R_SUCCEED();
+}
+
+constexpr DecompressorFunction GetNcaDecompressorFunction(CompressionType type) {
+    switch (type) {
+    case CompressionType::Lz4:
+        return DecompressLz4;
+    default:
+        return nullptr;
+    }
+}
+
+constexpr NcaCompressionConfiguration g_nca_compression_configuration{
+    .get_decompressor = GetNcaDecompressorFunction,
+};
+
+} // namespace
+
+const NcaCompressionConfiguration* GetNcaCompressionConfiguration() {
+    return std::addressof(g_nca_compression_configuration);
+}
+
+} // namespace FileSys
-- 
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