From 14e2df56101f7c7ab87939ea7a708ab4e6fb70c6 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 17:26:09 -0400
Subject: [PATCH 01/11] vfs_static: Remove template byte parameter from
 StaticVfsFile

This converts it into a regular constructor parameter. There's no need
to make this a template parameter on the class when it functions
perfectly well as a constructor argument.

This also reduces the amount of code bloat produced by the compiler, as
it doesn't need to generate the same code for multiple different
instantiations of the same class type, but with a different fill value.
---
 src/core/file_sys/romfs.cpp      |  2 +-
 src/core/file_sys/vfs_concat.cpp | 42 +++++++++++++++++++++++++-------
 src/core/file_sys/vfs_concat.h   | 33 +++----------------------
 src/core/file_sys/vfs_static.h   |  7 +++---
 4 files changed, 42 insertions(+), 42 deletions(-)

diff --git a/src/core/file_sys/romfs.cpp b/src/core/file_sys/romfs.cpp
index 205284a4d..7804ef56d 100644
--- a/src/core/file_sys/romfs.cpp
+++ b/src/core/file_sys/romfs.cpp
@@ -134,7 +134,7 @@ VirtualFile CreateRomFS(VirtualDir dir) {
         return nullptr;
 
     RomFSBuildContext ctx{dir};
-    return ConcatenateFiles<0>(ctx.Build(), dir->GetName());
+    return ConcatenateFiles(0, ctx.Build(), dir->GetName());
 }
 
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_concat.cpp b/src/core/file_sys/vfs_concat.cpp
index d9f9911da..8a0df508e 100644
--- a/src/core/file_sys/vfs_concat.cpp
+++ b/src/core/file_sys/vfs_concat.cpp
@@ -7,6 +7,7 @@
 
 #include "common/assert.h"
 #include "core/file_sys/vfs_concat.h"
+#include "core/file_sys/vfs_static.h"
 
 namespace FileSys {
 
@@ -22,15 +23,6 @@ static bool VerifyConcatenationMapContinuity(const std::map<u64, VirtualFile>& m
     return map.begin()->first == 0;
 }
 
-VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name) {
-    if (files.empty())
-        return nullptr;
-    if (files.size() == 1)
-        return files[0];
-
-    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
-}
-
 ConcatenatedVfsFile::ConcatenatedVfsFile(std::vector<VirtualFile> files_, std::string name)
     : name(std::move(name)) {
     std::size_t next_offset = 0;
@@ -109,4 +101,36 @@ bool ConcatenatedVfsFile::Rename(std::string_view name) {
     return false;
 }
 
+VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name) {
+    if (files.empty())
+        return nullptr;
+    if (files.size() == 1)
+        return files[0];
+
+    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+}
+
+VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files, std::string name) {
+    if (files.empty())
+        return nullptr;
+    if (files.size() == 1)
+        return files.begin()->second;
+
+    const auto last_valid = --files.end();
+    for (auto iter = files.begin(); iter != last_valid;) {
+        const auto old = iter++;
+        if (old->first + old->second->GetSize() != iter->first) {
+            files.emplace(old->first + old->second->GetSize(),
+                          std::make_shared<StaticVfsFile>(filler_byte, iter->first - old->first -
+                                                                           old->second->GetSize()));
+        }
+    }
+
+    // Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
+    if (files.begin()->first != 0)
+        files.emplace(0, std::make_shared<StaticVfsFile>(filler_byte, files.begin()->first));
+
+    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+}
+
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_concat.h b/src/core/file_sys/vfs_concat.h
index 76211d38a..17fa40ade 100644
--- a/src/core/file_sys/vfs_concat.h
+++ b/src/core/file_sys/vfs_concat.h
@@ -7,9 +7,7 @@
 #include <map>
 #include <memory>
 #include <string_view>
-#include <boost/container/flat_map.hpp>
 #include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_static.h"
 
 namespace FileSys {
 
@@ -17,9 +15,8 @@ namespace FileSys {
 // read-only.
 class ConcatenatedVfsFile : public VfsFile {
     friend VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
-
-    template <u8 filler_byte>
-    friend VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name);
+    friend VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files,
+                                        std::string name);
 
     ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
     ConcatenatedVfsFile(std::map<u64, VirtualFile> files, std::string name);
@@ -47,29 +44,7 @@ private:
 VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
 
 // Convenience function that turns a map of offsets to files into a concatenated file, filling gaps
-// with template parameter.
-template <u8 filler_byte>
-VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name) {
-    if (files.empty())
-        return nullptr;
-    if (files.size() == 1)
-        return files.begin()->second;
-
-    const auto last_valid = --files.end();
-    for (auto iter = files.begin(); iter != last_valid;) {
-        const auto old = iter++;
-        if (old->first + old->second->GetSize() != iter->first) {
-            files.emplace(old->first + old->second->GetSize(),
-                          std::make_shared<StaticVfsFile<filler_byte>>(iter->first - old->first -
-                                                                       old->second->GetSize()));
-        }
-    }
-
-    // Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
-    if (files.begin()->first != 0)
-        files.emplace(0, std::make_shared<StaticVfsFile<filler_byte>>(files.begin()->first));
-
-    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
-}
+// with a given filler byte.
+VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files, std::string name);
 
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_static.h b/src/core/file_sys/vfs_static.h
index 4dd47ffcc..8ad77d300 100644
--- a/src/core/file_sys/vfs_static.h
+++ b/src/core/file_sys/vfs_static.h
@@ -12,11 +12,11 @@
 
 namespace FileSys {
 
-template <u8 value>
 class StaticVfsFile : public VfsFile {
 public:
-    explicit StaticVfsFile(size_t size = 0, std::string name = "", VirtualDir parent = nullptr)
-        : size(size), name(std::move(name)), parent(std::move(parent)) {}
+    explicit StaticVfsFile(u8 value, size_t size = 0, std::string name = "",
+                           VirtualDir parent = nullptr)
+        : value{value}, size{size}, name{std::move(name)}, parent{std::move(parent)} {}
 
     std::string GetName() const override {
         return name;
@@ -70,6 +70,7 @@ public:
     }
 
 private:
+    u8 value;
     size_t size;
     std::string name;
     VirtualDir parent;

From 28bef31ea80478fe58bc4eeaf1b245005f15b36a Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 17:38:16 -0400
Subject: [PATCH 02/11] vfs_concat/vfs_layered: Remove friend declarations from
 ConcatenatedVfsFile

Given these are only added to the class to allow those functions to
access the private constructor, it's a better approach to just make them
static functions in the interface, to make the dependency explicit.
---
 src/core/core.cpp                      |  2 +-
 src/core/file_sys/patch_manager.cpp    |  5 +-
 src/core/file_sys/registered_cache.cpp |  2 +-
 src/core/file_sys/romfs.cpp            |  2 +-
 src/core/file_sys/vfs_concat.cpp       | 67 ++++++++++++++------------
 src/core/file_sys/vfs_concat.h         | 19 +++-----
 src/core/file_sys/vfs_layered.cpp      | 15 +++---
 src/core/file_sys/vfs_layered.h        |  8 ++-
 8 files changed, 59 insertions(+), 61 deletions(-)

diff --git a/src/core/core.cpp b/src/core/core.cpp
index 50f0a42fb..7666354dc 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -64,7 +64,7 @@ FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
         if (concat.empty())
             return nullptr;
 
-        return FileSys::ConcatenateFiles(concat, dir->GetName());
+        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(concat, dir->GetName());
     }
 
     return vfs->OpenFile(path, FileSys::Mode::Read);
diff --git a/src/core/file_sys/patch_manager.cpp b/src/core/file_sys/patch_manager.cpp
index af3f9a78f..561ad67a7 100644
--- a/src/core/file_sys/patch_manager.cpp
+++ b/src/core/file_sys/patch_manager.cpp
@@ -90,10 +90,9 @@ static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType t
 
             layers.push_back(std::move(extracted));
 
-            const auto layered = LayerDirectories(layers);
-
+            auto layered = LayeredVfsDirectory::MakeLayeredDirectory(std::move(layers));
             if (layered != nullptr) {
-                auto packed = CreateRomFS(layered);
+                auto packed = CreateRomFS(std::move(layered));
 
                 if (packed != nullptr) {
                     LOG_INFO(Loader, "    RomFS: LayeredFS patches applied successfully");
diff --git a/src/core/file_sys/registered_cache.cpp b/src/core/file_sys/registered_cache.cpp
index 653ef2e7b..e9b040689 100644
--- a/src/core/file_sys/registered_cache.cpp
+++ b/src/core/file_sys/registered_cache.cpp
@@ -125,7 +125,7 @@ VirtualFile RegisteredCache::OpenFileOrDirectoryConcat(const VirtualDir& dir,
             if (concat.empty())
                 return nullptr;
 
-            file = FileSys::ConcatenateFiles(concat, concat.front()->GetName());
+            file = ConcatenatedVfsFile::MakeConcatenatedFile(concat, concat.front()->GetName());
         }
 
         return file;
diff --git a/src/core/file_sys/romfs.cpp b/src/core/file_sys/romfs.cpp
index 7804ef56d..5910f7046 100644
--- a/src/core/file_sys/romfs.cpp
+++ b/src/core/file_sys/romfs.cpp
@@ -134,7 +134,7 @@ VirtualFile CreateRomFS(VirtualDir dir) {
         return nullptr;
 
     RomFSBuildContext ctx{dir};
-    return ConcatenateFiles(0, ctx.Build(), dir->GetName());
+    return ConcatenatedVfsFile::MakeConcatenatedFile(0, ctx.Build(), dir->GetName());
 }
 
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_concat.cpp b/src/core/file_sys/vfs_concat.cpp
index 8a0df508e..16d801c0c 100644
--- a/src/core/file_sys/vfs_concat.cpp
+++ b/src/core/file_sys/vfs_concat.cpp
@@ -39,6 +39,41 @@ ConcatenatedVfsFile::ConcatenatedVfsFile(std::map<u64, VirtualFile> files_, std:
 
 ConcatenatedVfsFile::~ConcatenatedVfsFile() = default;
 
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::vector<VirtualFile> files,
+                                                      std::string name) {
+    if (files.empty())
+        return nullptr;
+    if (files.size() == 1)
+        return files[0];
+
+    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+}
+
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
+                                                      std::map<u64, VirtualFile> files,
+                                                      std::string name) {
+    if (files.empty())
+        return nullptr;
+    if (files.size() == 1)
+        return files.begin()->second;
+
+    const auto last_valid = --files.end();
+    for (auto iter = files.begin(); iter != last_valid;) {
+        const auto old = iter++;
+        if (old->first + old->second->GetSize() != iter->first) {
+            files.emplace(old->first + old->second->GetSize(),
+                          std::make_shared<StaticVfsFile>(filler_byte, iter->first - old->first -
+                                                                           old->second->GetSize()));
+        }
+    }
+
+    // Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
+    if (files.begin()->first != 0)
+        files.emplace(0, std::make_shared<StaticVfsFile>(filler_byte, files.begin()->first));
+
+    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+}
+
 std::string ConcatenatedVfsFile::GetName() const {
     if (files.empty())
         return "";
@@ -101,36 +136,4 @@ bool ConcatenatedVfsFile::Rename(std::string_view name) {
     return false;
 }
 
-VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name) {
-    if (files.empty())
-        return nullptr;
-    if (files.size() == 1)
-        return files[0];
-
-    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
-}
-
-VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files, std::string name) {
-    if (files.empty())
-        return nullptr;
-    if (files.size() == 1)
-        return files.begin()->second;
-
-    const auto last_valid = --files.end();
-    for (auto iter = files.begin(); iter != last_valid;) {
-        const auto old = iter++;
-        if (old->first + old->second->GetSize() != iter->first) {
-            files.emplace(old->first + old->second->GetSize(),
-                          std::make_shared<StaticVfsFile>(filler_byte, iter->first - old->first -
-                                                                           old->second->GetSize()));
-        }
-    }
-
-    // Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
-    if (files.begin()->first != 0)
-        files.emplace(0, std::make_shared<StaticVfsFile>(filler_byte, files.begin()->first));
-
-    return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
-}
-
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_concat.h b/src/core/file_sys/vfs_concat.h
index 17fa40ade..c90f9d5d1 100644
--- a/src/core/file_sys/vfs_concat.h
+++ b/src/core/file_sys/vfs_concat.h
@@ -14,16 +14,20 @@ namespace FileSys {
 // Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently
 // read-only.
 class ConcatenatedVfsFile : public VfsFile {
-    friend VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
-    friend VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files,
-                                        std::string name);
-
     ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
     ConcatenatedVfsFile(std::map<u64, VirtualFile> files, std::string name);
 
 public:
     ~ConcatenatedVfsFile() override;
 
+    /// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
+    static VirtualFile MakeConcatenatedFile(std::vector<VirtualFile> files, std::string name);
+
+    /// Convenience function that turns a map of offsets to files into a concatenated file, filling
+    /// gaps with a given filler byte.
+    static VirtualFile MakeConcatenatedFile(u8 filler_byte, std::map<u64, VirtualFile> files,
+                                            std::string name);
+
     std::string GetName() const override;
     std::size_t GetSize() const override;
     bool Resize(std::size_t new_size) override;
@@ -40,11 +44,4 @@ private:
     std::string name;
 };
 
-// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
-VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
-
-// Convenience function that turns a map of offsets to files into a concatenated file, filling gaps
-// with a given filler byte.
-VirtualFile ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files, std::string name);
-
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_layered.cpp b/src/core/file_sys/vfs_layered.cpp
index 45563d7ae..bfee01725 100644
--- a/src/core/file_sys/vfs_layered.cpp
+++ b/src/core/file_sys/vfs_layered.cpp
@@ -8,7 +8,13 @@
 
 namespace FileSys {
 
-VirtualDir LayerDirectories(std::vector<VirtualDir> dirs, std::string name) {
+LayeredVfsDirectory::LayeredVfsDirectory(std::vector<VirtualDir> dirs, std::string name)
+    : dirs(std::move(dirs)), name(std::move(name)) {}
+
+LayeredVfsDirectory::~LayeredVfsDirectory() = default;
+
+VirtualDir LayeredVfsDirectory::MakeLayeredDirectory(std::vector<VirtualDir> dirs,
+                                                     std::string name) {
     if (dirs.empty())
         return nullptr;
     if (dirs.size() == 1)
@@ -17,11 +23,6 @@ VirtualDir LayerDirectories(std::vector<VirtualDir> dirs, std::string name) {
     return std::shared_ptr<VfsDirectory>(new LayeredVfsDirectory(std::move(dirs), std::move(name)));
 }
 
-LayeredVfsDirectory::LayeredVfsDirectory(std::vector<VirtualDir> dirs, std::string name)
-    : dirs(std::move(dirs)), name(std::move(name)) {}
-
-LayeredVfsDirectory::~LayeredVfsDirectory() = default;
-
 std::shared_ptr<VfsFile> LayeredVfsDirectory::GetFileRelative(std::string_view path) const {
     for (const auto& layer : dirs) {
         const auto file = layer->GetFileRelative(path);
@@ -41,7 +42,7 @@ std::shared_ptr<VfsDirectory> LayeredVfsDirectory::GetDirectoryRelative(
             out.push_back(std::move(dir));
     }
 
-    return LayerDirectories(std::move(out));
+    return MakeLayeredDirectory(std::move(out));
 }
 
 std::shared_ptr<VfsFile> LayeredVfsDirectory::GetFile(std::string_view name) const {
diff --git a/src/core/file_sys/vfs_layered.h b/src/core/file_sys/vfs_layered.h
index 4f6e341ab..d85310f57 100644
--- a/src/core/file_sys/vfs_layered.h
+++ b/src/core/file_sys/vfs_layered.h
@@ -9,20 +9,18 @@
 
 namespace FileSys {
 
-// Wrapper function to allow for more efficient handling of dirs.size() == 0, 1 cases.
-VirtualDir LayerDirectories(std::vector<VirtualDir> dirs, std::string name = "");
-
 // Class that stacks multiple VfsDirectories on top of each other, attempting to read from the first
 // one and falling back to the one after. The highest priority directory (overwrites all others)
 // should be element 0 in the dirs vector.
 class LayeredVfsDirectory : public VfsDirectory {
-    friend VirtualDir LayerDirectories(std::vector<VirtualDir> dirs, std::string name);
-
     LayeredVfsDirectory(std::vector<VirtualDir> dirs, std::string name);
 
 public:
     ~LayeredVfsDirectory() override;
 
+    /// Wrapper function to allow for more efficient handling of dirs.size() == 0, 1 cases.
+    static VirtualDir MakeLayeredDirectory(std::vector<VirtualDir> dirs, std::string name = "");
+
     std::shared_ptr<VfsFile> GetFileRelative(std::string_view path) const override;
     std::shared_ptr<VfsDirectory> GetDirectoryRelative(std::string_view path) const override;
     std::shared_ptr<VfsFile> GetFile(std::string_view name) const override;

From 57616f9758a23bbb9d1f7c5797c2831926004e49 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 17:56:14 -0400
Subject: [PATCH 03/11] vfs/etc: Append std:: to size_t usages

Given we just recently had a patch backport this from citra, let's try
and keep the convention uniform.
---
 src/core/file_sys/fsmitm_romfsbuild.cpp |  2 +-
 src/core/file_sys/vfs.cpp               |  6 +++---
 src/core/file_sys/vfs.h                 |  9 +++++----
 src/core/file_sys/vfs_static.h          | 16 ++++++++--------
 src/core/file_sys/vfs_vector.cpp        |  4 ++--
 src/core/file_sys/vfs_vector.h          |  8 ++++----
 src/yuzu/main.cpp                       | 14 +++++++-------
 7 files changed, 30 insertions(+), 29 deletions(-)

diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index 21fc3d796..16172445a 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -97,7 +97,7 @@ struct RomFSBuildFileContext {
     RomFSBuildFileContext() : path(""), cur_path_ofs(0), path_len(0) {}
 };
 
-static u32 romfs_calc_path_hash(u32 parent, std::string path, u32 start, size_t path_len) {
+static u32 romfs_calc_path_hash(u32 parent, std::string path, u32 start, std::size_t path_len) {
     u32 hash = parent ^ 123456789;
     for (u32 i = 0; i < path_len; i++) {
         hash = (hash >> 5) | (hash << 27);
diff --git a/src/core/file_sys/vfs.cpp b/src/core/file_sys/vfs.cpp
index 5fbea1739..bfe50da73 100644
--- a/src/core/file_sys/vfs.cpp
+++ b/src/core/file_sys/vfs.cpp
@@ -463,14 +463,14 @@ bool DeepEquals(const VirtualFile& file1, const VirtualFile& file2, std::size_t
     return true;
 }
 
-bool VfsRawCopy(const VirtualFile& src, const VirtualFile& dest, size_t block_size) {
+bool VfsRawCopy(const VirtualFile& src, const VirtualFile& dest, std::size_t block_size) {
     if (src == nullptr || dest == nullptr || !src->IsReadable() || !dest->IsWritable())
         return false;
     if (!dest->Resize(src->GetSize()))
         return false;
 
     std::vector<u8> temp(std::min(block_size, src->GetSize()));
-    for (size_t i = 0; i < src->GetSize(); i += block_size) {
+    for (std::size_t i = 0; i < src->GetSize(); i += block_size) {
         const auto read = std::min(block_size, src->GetSize() - i);
         const auto block = src->Read(temp.data(), read, i);
 
@@ -481,7 +481,7 @@ bool VfsRawCopy(const VirtualFile& src, const VirtualFile& dest, size_t block_si
     return true;
 }
 
-bool VfsRawCopyD(const VirtualDir& src, const VirtualDir& dest, size_t block_size) {
+bool VfsRawCopyD(const VirtualDir& src, const VirtualDir& dest, std::size_t block_size) {
     if (src == nullptr || dest == nullptr || !src->IsReadable() || !dest->IsWritable())
         return false;
 
diff --git a/src/core/file_sys/vfs.h b/src/core/file_sys/vfs.h
index cea4aa8b8..270291631 100644
--- a/src/core/file_sys/vfs.h
+++ b/src/core/file_sys/vfs.h
@@ -315,18 +315,19 @@ public:
     bool Rename(std::string_view name) override;
 };
 
-// Compare the two files, byte-for-byte, in increments specificed by block_size
-bool DeepEquals(const VirtualFile& file1, const VirtualFile& file2, size_t block_size = 0x1000);
+// Compare the two files, byte-for-byte, in increments specified by block_size
+bool DeepEquals(const VirtualFile& file1, const VirtualFile& file2,
+                std::size_t block_size = 0x1000);
 
 // A method that copies the raw data between two different implementations of VirtualFile. If you
 // are using the same implementation, it is probably better to use the Copy method in the parent
 // directory of src/dest.
-bool VfsRawCopy(const VirtualFile& src, const VirtualFile& dest, size_t block_size = 0x1000);
+bool VfsRawCopy(const VirtualFile& src, const VirtualFile& dest, std::size_t block_size = 0x1000);
 
 // A method that performs a similar function to VfsRawCopy above, but instead copies entire
 // directories. It suffers the same performance penalties as above and an implementation-specific
 // Copy should always be preferred.
-bool VfsRawCopyD(const VirtualDir& src, const VirtualDir& dest, size_t block_size = 0x1000);
+bool VfsRawCopyD(const VirtualDir& src, const VirtualDir& dest, std::size_t block_size = 0x1000);
 
 // Checks if the directory at path relative to rel exists. If it does, returns that. If it does not
 // it attempts to create it and returns the new dir or nullptr on failure.
diff --git a/src/core/file_sys/vfs_static.h b/src/core/file_sys/vfs_static.h
index 8ad77d300..44fab51d1 100644
--- a/src/core/file_sys/vfs_static.h
+++ b/src/core/file_sys/vfs_static.h
@@ -14,7 +14,7 @@ namespace FileSys {
 
 class StaticVfsFile : public VfsFile {
 public:
-    explicit StaticVfsFile(u8 value, size_t size = 0, std::string name = "",
+    explicit StaticVfsFile(u8 value, std::size_t size = 0, std::string name = "",
                            VirtualDir parent = nullptr)
         : value{value}, size{size}, name{std::move(name)}, parent{std::move(parent)} {}
 
@@ -22,11 +22,11 @@ public:
         return name;
     }
 
-    size_t GetSize() const override {
+    std::size_t GetSize() const override {
         return size;
     }
 
-    bool Resize(size_t new_size) override {
+    bool Resize(std::size_t new_size) override {
         size = new_size;
         return true;
     }
@@ -43,23 +43,23 @@ public:
         return true;
     }
 
-    size_t Read(u8* data, size_t length, size_t offset) const override {
+    std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override {
         const auto read = std::min(length, size - offset);
         std::fill(data, data + read, value);
         return read;
     }
 
-    size_t Write(const u8* data, size_t length, size_t offset) override {
+    std::size_t Write(const u8* data, std::size_t length, std::size_t offset) override {
         return 0;
     }
 
-    boost::optional<u8> ReadByte(size_t offset) const override {
+    boost::optional<u8> ReadByte(std::size_t offset) const override {
         if (offset < size)
             return value;
         return boost::none;
     }
 
-    std::vector<u8> ReadBytes(size_t length, size_t offset) const override {
+    std::vector<u8> ReadBytes(std::size_t length, std::size_t offset) const override {
         const auto read = std::min(length, size - offset);
         return std::vector<u8>(read, value);
     }
@@ -71,7 +71,7 @@ public:
 
 private:
     u8 value;
-    size_t size;
+    std::size_t size;
     std::string name;
     VirtualDir parent;
 };
diff --git a/src/core/file_sys/vfs_vector.cpp b/src/core/file_sys/vfs_vector.cpp
index 7033e2c88..23cff3fb9 100644
--- a/src/core/file_sys/vfs_vector.cpp
+++ b/src/core/file_sys/vfs_vector.cpp
@@ -38,13 +38,13 @@ bool VectorVfsFile::IsReadable() const {
     return true;
 }
 
-size_t VectorVfsFile::Read(u8* data_, size_t length, size_t offset) const {
+std::size_t VectorVfsFile::Read(u8* data_, std::size_t length, std::size_t offset) const {
     const auto read = std::min(length, data.size() - offset);
     std::memcpy(data_, data.data() + offset, read);
     return read;
 }
 
-size_t VectorVfsFile::Write(const u8* data_, size_t length, size_t offset) {
+std::size_t VectorVfsFile::Write(const u8* data_, std::size_t length, std::size_t offset) {
     if (offset + length > data.size())
         data.resize(offset + length);
     const auto write = std::min(length, data.size() - offset);
diff --git a/src/core/file_sys/vfs_vector.h b/src/core/file_sys/vfs_vector.h
index 115c3ae95..48a414c98 100644
--- a/src/core/file_sys/vfs_vector.h
+++ b/src/core/file_sys/vfs_vector.h
@@ -16,13 +16,13 @@ public:
     ~VectorVfsFile() override;
 
     std::string GetName() const override;
-    size_t GetSize() const override;
-    bool Resize(size_t new_size) override;
+    std::size_t GetSize() const override;
+    bool Resize(std::size_t new_size) override;
     std::shared_ptr<VfsDirectory> GetContainingDirectory() const override;
     bool IsWritable() const override;
     bool IsReadable() const override;
-    size_t Read(u8* data, size_t length, size_t offset) const override;
-    size_t Write(const u8* data, size_t length, size_t offset) override;
+    std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
+    std::size_t Write(const u8* data, std::size_t length, std::size_t offset) override;
     bool Rename(std::string_view name) override;
 
     virtual void Assign(std::vector<u8> new_data);
diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index dc8b5407d..1455edc89 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -760,7 +760,7 @@ void GMainWindow::OnGameListDumpRomFS(u64 program_id, const std::string& game_pa
     const auto path = fmt::format("{}{:016X}/romfs",
                                   FileUtil::GetUserPath(FileUtil::UserPath::DumpDir), program_id);
 
-    auto failed = [this, &path]() {
+    const auto failed = [this, &path] {
         QMessageBox::warning(this, tr("RomFS Extraction Failed!"),
                              tr("There was an error copying the RomFS files or the user "
                                 "cancelled the operation."));
@@ -809,9 +809,9 @@ void GMainWindow::OnGameListDumpRomFS(u64 program_id, const std::string& game_pa
 
     const auto full = res == "Full";
 
-    const static std::function<size_t(const FileSys::VirtualDir&, bool)> calculate_entry_size =
+    static const std::function<std::size_t(const FileSys::VirtualDir&, bool)> calculate_entry_size =
         [](const FileSys::VirtualDir& dir, bool full) {
-            size_t out = 0;
+            std::size_t out = 0;
             for (const auto& subdir : dir->GetSubdirectories())
                 out += 1 + calculate_entry_size(subdir, full);
             return out + full ? dir->GetFiles().size() : 0;
@@ -822,10 +822,10 @@ void GMainWindow::OnGameListDumpRomFS(u64 program_id, const std::string& game_pa
     progress.setWindowModality(Qt::WindowModal);
     progress.setMinimumDuration(100);
 
-    const static std::function<bool(QProgressDialog&, const FileSys::VirtualDir&,
-                                    const FileSys::VirtualDir&, size_t, bool)>
+    static const std::function<bool(QProgressDialog&, const FileSys::VirtualDir&,
+                                    const FileSys::VirtualDir&, std::size_t, bool)>
         qt_raw_copy = [](QProgressDialog& dialog, const FileSys::VirtualDir& src,
-                         const FileSys::VirtualDir& dest, size_t block_size, bool full) {
+                         const FileSys::VirtualDir& dest, std::size_t block_size, bool full) {
             if (src == nullptr || dest == nullptr || !src->IsReadable() || !dest->IsWritable())
                 return false;
             if (dialog.wasCanceled())
@@ -931,7 +931,7 @@ void GMainWindow::OnMenuInstallToNAND() {
     }
 
     const auto qt_raw_copy = [this](const FileSys::VirtualFile& src,
-                                    const FileSys::VirtualFile& dest, size_t block_size) {
+                                    const FileSys::VirtualFile& dest, std::size_t block_size) {
         if (src == nullptr || dest == nullptr)
             return false;
         if (!dest->Resize(src->GetSize()))

From cbb146069a7b20d5687d5d163fd1400af3151485 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:04:22 -0400
Subject: [PATCH 04/11] yuzu/main: Move functions stored into static
 std::function instances out of OnGameListDumpRomFS()

This can cause warnings about static constructors, and is also not ideal
performance-wise due to the indirection through std::function. This also
keeps the behavior itself separate from the surrounding code, which can
make it nicer to read, due to the size of the code.
---
 src/yuzu/main.cpp | 84 +++++++++++++++++++++++------------------------
 1 file changed, 42 insertions(+), 42 deletions(-)

diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index 1455edc89..1b125cbd3 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -756,6 +756,46 @@ void GMainWindow::OnGameListOpenFolder(u64 program_id, GameListOpenTarget target
     QDesktopServices::openUrl(QUrl::fromLocalFile(qpath));
 }
 
+static std::size_t CalculateRomFSEntrySize(const FileSys::VirtualDir& dir, bool full) {
+    std::size_t out = 0;
+
+    for (const auto& subdir : dir->GetSubdirectories()) {
+        out += 1 + CalculateRomFSEntrySize(subdir, full);
+    }
+
+    return out + full ? dir->GetFiles().size() : 0;
+}
+
+static bool RomFSRawCopy(QProgressDialog& dialog, const FileSys::VirtualDir& src,
+                         const FileSys::VirtualDir& dest, std::size_t block_size, bool full) {
+    if (src == nullptr || dest == nullptr || !src->IsReadable() || !dest->IsWritable())
+        return false;
+    if (dialog.wasCanceled())
+        return false;
+
+    if (full) {
+        for (const auto& file : src->GetFiles()) {
+            const auto out = VfsDirectoryCreateFileWrapper(dest, file->GetName());
+            if (!FileSys::VfsRawCopy(file, out, block_size))
+                return false;
+            dialog.setValue(dialog.value() + 1);
+            if (dialog.wasCanceled())
+                return false;
+        }
+    }
+
+    for (const auto& dir : src->GetSubdirectories()) {
+        const auto out = dest->CreateSubdirectory(dir->GetName());
+        if (!RomFSRawCopy(dialog, dir, out, block_size, full))
+            return false;
+        dialog.setValue(dialog.value() + 1);
+        if (dialog.wasCanceled())
+            return false;
+    }
+
+    return true;
+}
+
 void GMainWindow::OnGameListDumpRomFS(u64 program_id, const std::string& game_path) {
     const auto path = fmt::format("{}{:016X}/romfs",
                                   FileUtil::GetUserPath(FileUtil::UserPath::DumpDir), program_id);
@@ -808,53 +848,13 @@ void GMainWindow::OnGameListDumpRomFS(u64 program_id, const std::string& game_pa
         failed();
 
     const auto full = res == "Full";
-
-    static const std::function<std::size_t(const FileSys::VirtualDir&, bool)> calculate_entry_size =
-        [](const FileSys::VirtualDir& dir, bool full) {
-            std::size_t out = 0;
-            for (const auto& subdir : dir->GetSubdirectories())
-                out += 1 + calculate_entry_size(subdir, full);
-            return out + full ? dir->GetFiles().size() : 0;
-        };
-    const auto entry_size = calculate_entry_size(extracted, full);
+    const auto entry_size = CalculateRomFSEntrySize(extracted, full);
 
     QProgressDialog progress(tr("Extracting RomFS..."), tr("Cancel"), 0, entry_size, this);
     progress.setWindowModality(Qt::WindowModal);
     progress.setMinimumDuration(100);
 
-    static const std::function<bool(QProgressDialog&, const FileSys::VirtualDir&,
-                                    const FileSys::VirtualDir&, std::size_t, bool)>
-        qt_raw_copy = [](QProgressDialog& dialog, const FileSys::VirtualDir& src,
-                         const FileSys::VirtualDir& dest, std::size_t block_size, bool full) {
-            if (src == nullptr || dest == nullptr || !src->IsReadable() || !dest->IsWritable())
-                return false;
-            if (dialog.wasCanceled())
-                return false;
-
-            if (full) {
-                for (const auto& file : src->GetFiles()) {
-                    const auto out = VfsDirectoryCreateFileWrapper(dest, file->GetName());
-                    if (!FileSys::VfsRawCopy(file, out, block_size))
-                        return false;
-                    dialog.setValue(dialog.value() + 1);
-                    if (dialog.wasCanceled())
-                        return false;
-                }
-            }
-
-            for (const auto& dir : src->GetSubdirectories()) {
-                const auto out = dest->CreateSubdirectory(dir->GetName());
-                if (!qt_raw_copy(dialog, dir, out, block_size, full))
-                    return false;
-                dialog.setValue(dialog.value() + 1);
-                if (dialog.wasCanceled())
-                    return false;
-            }
-
-            return true;
-        };
-
-    if (qt_raw_copy(progress, extracted, out, 0x400000, full)) {
+    if (RomFSRawCopy(progress, extracted, out, 0x400000, full)) {
         progress.close();
         QMessageBox::information(this, tr("RomFS Extraction Succeeded!"),
                                  tr("The operation completed successfully."));

From f646ca874d8589f4be4a7e6bcce69301e60b24f3 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:06:35 -0400
Subject: [PATCH 05/11] yuzu/main: Resolve precedence bug within
 CalculateRomFSEntrySize()

Ternary operators have a lower precedence than arithmetic operators, so
what was actually occurring here is "return (out + full) ? x : y" which most
definitely isn't intended, given we calculate out recursively above. We
were essentially doing a lot of work for nothing.
---
 src/yuzu/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index 1b125cbd3..d74489935 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -763,7 +763,7 @@ static std::size_t CalculateRomFSEntrySize(const FileSys::VirtualDir& dir, bool
         out += 1 + CalculateRomFSEntrySize(subdir, full);
     }
 
-    return out + full ? dir->GetFiles().size() : 0;
+    return out + (full ? dir->GetFiles().size() : 0);
 }
 
 static bool RomFSRawCopy(QProgressDialog& dialog, const FileSys::VirtualDir& src,

From fa9e0f9c8bf3c14e424d386ec85019e9498f7f12 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:10:47 -0400
Subject: [PATCH 06/11] fsmitm_romfsbuild: Make auto variable into a
 std::size_t variable within Build()

auto x = 0;

auto-deduces x to be an int. This is undesirable when working with
unsigned values. It also causes sign conversion warnings. Instead, we
can make it a proper unsigned value with the correct width that the
following expressions operate on.
---
 src/core/file_sys/fsmitm_romfsbuild.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index 16172445a..a8af5e14f 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -355,7 +355,7 @@ std::map<u64, VirtualFile> RomFSBuildContext::Build() {
 
     std::vector<u8> metadata(file_hash_table_size + file_table_size + dir_hash_table_size +
                              dir_table_size);
-    auto index = 0;
+    std::size_t index = 0;
     std::memcpy(metadata.data(), dir_hash_table.data(), dir_hash_table.size() * sizeof(u32));
     index += dir_hash_table.size() * sizeof(u32);
     std::memcpy(metadata.data() + index, dir_table.data(), dir_table.size());

From 1f92cbc059aaca13823c71a9279393661b050d34 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:14:29 -0400
Subject: [PATCH 07/11] fsmitm_romfsbuild: Remove unnecessary loops in Build()

The std::vector instances are already initially allocated with all
entries having these values, there's no need to loop through and fill
them with it again when they aren't modified.
---
 src/core/file_sys/fsmitm_romfsbuild.cpp | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index a8af5e14f..b8807e5ca 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -233,12 +233,6 @@ std::map<u64, VirtualFile> RomFSBuildContext::Build() {
     std::vector<u8> dir_table(dir_table_size);
     std::vector<u8> file_table(file_table_size);
 
-    // Clear out hash tables.
-    for (u32 i = 0; i < dir_hash_table_entry_count; i++)
-        dir_hash_table[i] = ROMFS_ENTRY_EMPTY;
-    for (u32 i = 0; i < file_hash_table_entry_count; i++)
-        file_hash_table[i] = ROMFS_ENTRY_EMPTY;
-
     std::shared_ptr<RomFSBuildFileContext> cur_file;
 
     // Determine file offsets.

From 91b56c49280355cf4d1d4283ce05645a85aac1fb Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:17:42 -0400
Subject: [PATCH 08/11] fsmitm_romfsbuild: Remove unnecessary constructors and
 initializers for RomFSBuildFileContext and RomFSBuildDirectoryContext

There's no need to duplicate in-class initializers with a constructor
initializer list. std::strings also initialize to empty by default.
---
 src/core/file_sys/fsmitm_romfsbuild.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index b8807e5ca..20dd69570 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -73,7 +73,7 @@ static_assert(sizeof(RomFSFileEntry) == 0x20, "RomFSFileEntry has incorrect size
 struct RomFSBuildFileContext;
 
 struct RomFSBuildDirectoryContext {
-    std::string path = "";
+    std::string path;
     u32 cur_path_ofs = 0;
     u32 path_len = 0;
     u32 entry_offset = 0;
@@ -84,7 +84,7 @@ struct RomFSBuildDirectoryContext {
 };
 
 struct RomFSBuildFileContext {
-    std::string path = "";
+    std::string path;
     u32 cur_path_ofs = 0;
     u32 path_len = 0;
     u32 entry_offset = 0;
@@ -92,9 +92,7 @@ struct RomFSBuildFileContext {
     u64 size = 0;
     std::shared_ptr<RomFSBuildDirectoryContext> parent;
     std::shared_ptr<RomFSBuildFileContext> sibling;
-    VirtualFile source = nullptr;
-
-    RomFSBuildFileContext() : path(""), cur_path_ofs(0), path_len(0) {}
+    VirtualFile source;
 };
 
 static u32 romfs_calc_path_hash(u32 parent, std::string path, u32 start, std::size_t path_len) {

From 4654f896184fa1b97df5920ef775f033c2b2fcbb Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 18:25:10 -0400
Subject: [PATCH 09/11] fsmitm_romfsbuild: Avoid type truncation warnings

Cast where explicitly necessary and in other cases we can simply modify
the algorithm to accomodate larger data.
---
 src/core/file_sys/fsmitm_romfsbuild.cpp | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index 20dd69570..07b074817 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -105,13 +105,16 @@ static u32 romfs_calc_path_hash(u32 parent, std::string path, u32 start, std::si
     return hash;
 }
 
-static u32 romfs_get_hash_table_count(u32 num_entries) {
+static u64 romfs_get_hash_table_count(u64 num_entries) {
     if (num_entries < 3) {
         return 3;
-    } else if (num_entries < 19) {
+    }
+
+    if (num_entries < 19) {
         return num_entries | 1;
     }
-    u32 count = num_entries;
+
+    u64 count = num_entries;
     while (count % 2 == 0 || count % 3 == 0 || count % 5 == 0 || count % 7 == 0 ||
            count % 11 == 0 || count % 13 == 0 || count % 17 == 0) {
         count++;
@@ -137,7 +140,7 @@ void RomFSBuildContext::VisitDirectory(VirtualDir root_romfs,
             const auto child = std::make_shared<RomFSBuildDirectoryContext>();
             // Set child's path.
             child->cur_path_ofs = parent->path_len + 1;
-            child->path_len = child->cur_path_ofs + kv.first.size();
+            child->path_len = child->cur_path_ofs + static_cast<u32>(kv.first.size());
             child->path = parent->path + "/" + kv.first;
 
             // Sanity check on path_len
@@ -150,7 +153,7 @@ void RomFSBuildContext::VisitDirectory(VirtualDir root_romfs,
             const auto child = std::make_shared<RomFSBuildFileContext>();
             // Set child's path.
             child->cur_path_ofs = parent->path_len + 1;
-            child->path_len = child->cur_path_ofs + kv.first.size();
+            child->path_len = child->cur_path_ofs + static_cast<u32>(kv.first.size());
             child->path = parent->path + "/" + kv.first;
 
             // Sanity check on path_len
@@ -217,8 +220,8 @@ RomFSBuildContext::RomFSBuildContext(VirtualDir base_) : base(std::move(base_))
 RomFSBuildContext::~RomFSBuildContext() = default;
 
 std::map<u64, VirtualFile> RomFSBuildContext::Build() {
-    const auto dir_hash_table_entry_count = romfs_get_hash_table_count(num_dirs);
-    const auto file_hash_table_entry_count = romfs_get_hash_table_count(num_files);
+    const u64 dir_hash_table_entry_count = romfs_get_hash_table_count(num_dirs);
+    const u64 file_hash_table_entry_count = romfs_get_hash_table_count(num_files);
     dir_hash_table_size = 4 * dir_hash_table_entry_count;
     file_hash_table_size = 4 * file_hash_table_entry_count;
 

From e3b2ef917076d10b7dab45023b5f15b9c0985400 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 19:56:46 -0400
Subject: [PATCH 10/11] vfs_vector: Amend initializer list order in
 VectorVfsFile's constructor initializer list

Orders the initializer list members to be in the same order that they
would be initialized in. Avoids compiler warnings.
---
 src/core/file_sys/vfs_vector.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/file_sys/vfs_vector.cpp b/src/core/file_sys/vfs_vector.cpp
index 23cff3fb9..389c7e003 100644
--- a/src/core/file_sys/vfs_vector.cpp
+++ b/src/core/file_sys/vfs_vector.cpp
@@ -9,7 +9,7 @@
 
 namespace FileSys {
 VectorVfsFile::VectorVfsFile(std::vector<u8> initial_data, std::string name, VirtualDir parent)
-    : data(std::move(initial_data)), name(std::move(name)), parent(std::move(parent)) {}
+    : data(std::move(initial_data)), parent(std::move(parent)), name(std::move(name)) {}
 
 VectorVfsFile::~VectorVfsFile() = default;
 

From 11104b48834b2f8e5c59edc46b794e6ab0bd9c4f Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 25 Sep 2018 20:09:20 -0400
Subject: [PATCH 11/11] patch_manager: Invert conditionals within
 ApplyLayeredFS()

Avoids the need to nest code quite a bit by early-exiting in error
cases.
---
 src/core/file_sys/patch_manager.cpp | 63 +++++++++++++++--------------
 1 file changed, 33 insertions(+), 30 deletions(-)

diff --git a/src/core/file_sys/patch_manager.cpp b/src/core/file_sys/patch_manager.cpp
index 561ad67a7..4b3b5e665 100644
--- a/src/core/file_sys/patch_manager.cpp
+++ b/src/core/file_sys/patch_manager.cpp
@@ -70,37 +70,40 @@ VirtualDir PatchManager::PatchExeFS(VirtualDir exefs) const {
 
 static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType type) {
     const auto load_dir = Service::FileSystem::GetModificationLoadRoot(title_id);
-    if (type == ContentRecordType::Program && load_dir != nullptr && load_dir->GetSize() > 0) {
-        auto extracted = ExtractRomFS(romfs);
-
-        if (extracted != nullptr) {
-            auto patch_dirs = load_dir->GetSubdirectories();
-            std::sort(patch_dirs.begin(), patch_dirs.end(),
-                      [](const VirtualDir& l, const VirtualDir& r) {
-                          return l->GetName() < r->GetName();
-                      });
-
-            std::vector<VirtualDir> layers;
-            layers.reserve(patch_dirs.size() + 1);
-            for (const auto& subdir : patch_dirs) {
-                auto romfs_dir = subdir->GetSubdirectory("romfs");
-                if (romfs_dir != nullptr)
-                    layers.push_back(std::move(romfs_dir));
-            }
-
-            layers.push_back(std::move(extracted));
-
-            auto layered = LayeredVfsDirectory::MakeLayeredDirectory(std::move(layers));
-            if (layered != nullptr) {
-                auto packed = CreateRomFS(std::move(layered));
-
-                if (packed != nullptr) {
-                    LOG_INFO(Loader, "    RomFS: LayeredFS patches applied successfully");
-                    romfs = std::move(packed);
-                }
-            }
-        }
+    if (type != ContentRecordType::Program || load_dir == nullptr || load_dir->GetSize() <= 0) {
+        return;
     }
+
+    auto extracted = ExtractRomFS(romfs);
+    if (extracted == nullptr) {
+        return;
+    }
+
+    auto patch_dirs = load_dir->GetSubdirectories();
+    std::sort(patch_dirs.begin(), patch_dirs.end(),
+              [](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); });
+
+    std::vector<VirtualDir> layers;
+    layers.reserve(patch_dirs.size() + 1);
+    for (const auto& subdir : patch_dirs) {
+        auto romfs_dir = subdir->GetSubdirectory("romfs");
+        if (romfs_dir != nullptr)
+            layers.push_back(std::move(romfs_dir));
+    }
+    layers.push_back(std::move(extracted));
+
+    auto layered = LayeredVfsDirectory::MakeLayeredDirectory(std::move(layers));
+    if (layered == nullptr) {
+        return;
+    }
+
+    auto packed = CreateRomFS(std::move(layered));
+    if (packed == nullptr) {
+        return;
+    }
+
+    LOG_INFO(Loader, "    RomFS: LayeredFS patches applied successfully");
+    romfs = std::move(packed);
 }
 
 VirtualFile PatchManager::PatchRomFS(VirtualFile romfs, u64 ivfc_offset,