10 files changed, 1198 insertions, 22 deletions

diff --git a/src/core/file_sys/archive_backend.cpp b/src/core/file_sys/archive_backend.cpp
index 1fae0ede0..87a240d7a 100644
--- a/src/core/file_sys/archive_backend.cpp
+++ b/src/core/file_sys/archive_backend.cpp
@@ -90,6 +90,8 @@ std::u16string Path::AsU16Str() const {
         LOG_ERROR(Service_FS, "LowPathType cannot be converted to u16string!");
         return {};
     }
+
+    UNREACHABLE();
 }
 
 std::vector<u8> Path::AsBinary() const {
diff --git a/src/core/file_sys/archive_ncch.cpp b/src/core/file_sys/archive_ncch.cpp
index 6d9007731..e8c5be983 100644
--- a/src/core/file_sys/archive_ncch.cpp
+++ b/src/core/file_sys/archive_ncch.cpp
@@ -13,7 +13,10 @@
 #include "core/file_sys/archive_ncch.h"
 #include "core/file_sys/errors.h"
 #include "core/file_sys/ivfc_archive.h"
+#include "core/file_sys/ncch_container.h"
+#include "core/file_sys/title_metadata.h"
 #include "core/hle/service/fs/archive.h"
+#include "core/loader/loader.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // FileSys namespace
@@ -25,8 +28,18 @@ static std::string GetNCCHContainerPath(const std::string& nand_directory) {
 }
 
 static std::string GetNCCHPath(const std::string& mount_point, u32 high, u32 low) {
-    return Common::StringFromFormat("%s%08x/%08x/content/00000000.app.romfs", mount_point.c_str(),
-                                    high, low);
+    u32 content_id = 0;
+
+    // TODO(shinyquagsire23): Title database should be doing this path lookup
+    std::string content_path =
+        Common::StringFromFormat("%s%08x/%08x/content/", mount_point.c_str(), high, low);
+    std::string tmd_path = content_path + "00000000.tmd";
+    TitleMetadata tmd(tmd_path);
+    if (tmd.Load() == Loader::ResultStatus::Success) {
+        content_id = tmd.GetBootContentID();
+    }
+
+    return Common::StringFromFormat("%s%08x.app", content_path.c_str(), content_id);
 }
 
 ArchiveFactory_NCCH::ArchiveFactory_NCCH(const std::string& nand_directory)
@@ -38,9 +51,14 @@ ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_NCCH::Open(const Path&
     u32 high = data[1];
     u32 low = data[0];
     std::string file_path = GetNCCHPath(mount_point, high, low);
-    auto file = std::make_shared<FileUtil::IOFile>(file_path, "rb");
 
-    if (!file->IsOpen()) {
+    std::shared_ptr<FileUtil::IOFile> romfs_file;
+    u64 romfs_offset = 0;
+    u64 romfs_size = 0;
+    auto ncch_container = NCCHContainer(file_path);
+
+    if (ncch_container.ReadRomFS(romfs_file, romfs_offset, romfs_size) !=
+        Loader::ResultStatus::Success) {
         // High Title ID of the archive: The category (https://3dbrew.org/wiki/Title_list).
         constexpr u32 shared_data_archive = 0x0004009B;
         constexpr u32 system_data_archive = 0x000400DB;
@@ -74,9 +92,8 @@ ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_NCCH::Open(const Path&
         }
         return ERROR_NOT_FOUND;
     }
-    auto size = file->GetSize();
 
-    auto archive = std::make_unique<IVFCArchive>(file, 0, size);
+    auto archive = std::make_unique<IVFCArchive>(romfs_file, romfs_offset, romfs_size);
     return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
 }
 
diff --git a/src/core/file_sys/archive_sdmc.cpp b/src/core/file_sys/archive_sdmc.cpp
index 679909d06..fe3dce5d4 100644
--- a/src/core/file_sys/archive_sdmc.cpp
+++ b/src/core/file_sys/archive_sdmc.cpp
@@ -121,7 +121,25 @@ ResultCode SDMCArchive::DeleteFile(const Path& path) const {
 }
 
 ResultCode SDMCArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
-    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString())) {
+    const PathParser path_parser_src(src_path);
+
+    // TODO: Verify these return codes with HW
+    if (!path_parser_src.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid src path %s", src_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const PathParser path_parser_dest(dest_path);
+
+    if (!path_parser_dest.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid dest path %s", dest_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto src_path_full = path_parser_src.BuildHostPath(mount_point);
+    const auto dest_path_full = path_parser_dest.BuildHostPath(mount_point);
+
+    if (FileUtil::Rename(src_path_full, dest_path_full)) {
         return RESULT_SUCCESS;
     }
 
@@ -260,8 +278,27 @@ ResultCode SDMCArchive::CreateDirectory(const Path& path) const {
 }
 
 ResultCode SDMCArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
-    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString()))
+    const PathParser path_parser_src(src_path);
+
+    // TODO: Verify these return codes with HW
+    if (!path_parser_src.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid src path %s", src_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const PathParser path_parser_dest(dest_path);
+
+    if (!path_parser_dest.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid dest path %s", dest_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto src_path_full = path_parser_src.BuildHostPath(mount_point);
+    const auto dest_path_full = path_parser_dest.BuildHostPath(mount_point);
+
+    if (FileUtil::Rename(src_path_full, dest_path_full)) {
         return RESULT_SUCCESS;
+    }
 
     // TODO(yuriks): This code probably isn't right, it'll return a Status even if the file didn't
     // exist or similar. Verify.
diff --git a/src/core/file_sys/archive_selfncch.cpp b/src/core/file_sys/archive_selfncch.cpp
index 298a37a44..3222000cf 100644
--- a/src/core/file_sys/archive_selfncch.cpp
+++ b/src/core/file_sys/archive_selfncch.cpp
@@ -3,12 +3,14 @@
 // Refer to the license.txt file included.
 
 #include <array>
+#include <cinttypes>
 #include "common/common_types.h"
 #include "common/logging/log.h"
 #include "common/swap.h"
 #include "core/file_sys/archive_selfncch.h"
 #include "core/file_sys/errors.h"
 #include "core/file_sys/ivfc_archive.h"
+#include "core/hle/kernel/process.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // FileSys namespace
@@ -102,8 +104,7 @@ public:
 
         switch (static_cast<SelfNCCHFilePathType>(file_path.type)) {
         case SelfNCCHFilePathType::UpdateRomFS:
-            LOG_WARNING(Service_FS, "(STUBBED) open update RomFS");
-            return OpenRomFS();
+            return OpenUpdateRomFS();
 
         case SelfNCCHFilePathType::RomFS:
             return OpenRomFS();
@@ -179,6 +180,17 @@ private:
         }
     }
 
+    ResultVal<std::unique_ptr<FileBackend>> OpenUpdateRomFS() const {
+        if (ncch_data.update_romfs_file) {
+            return MakeResult<std::unique_ptr<FileBackend>>(std::make_unique<IVFCFile>(
+                ncch_data.update_romfs_file, ncch_data.update_romfs_offset,
+                ncch_data.update_romfs_size));
+        } else {
+            LOG_INFO(Service_FS, "Unable to read update RomFS");
+            return ERROR_ROMFS_NOT_FOUND;
+        }
+    }
+
     ResultVal<std::unique_ptr<FileBackend>> OpenExeFS(const std::string& filename) const {
         if (filename == "icon") {
             if (ncch_data.icon) {
@@ -217,31 +229,59 @@ private:
     NCCHData ncch_data;
 };
 
-ArchiveFactory_SelfNCCH::ArchiveFactory_SelfNCCH(Loader::AppLoader& app_loader) {
+void ArchiveFactory_SelfNCCH::Register(Loader::AppLoader& app_loader) {
+    u64 program_id = 0;
+    if (app_loader.ReadProgramId(program_id) != Loader::ResultStatus::Success) {
+        LOG_WARNING(
+            Service_FS,
+            "Could not read program id when registering with SelfNCCH, this might be a 3dsx file");
+    }
+
+    LOG_DEBUG(Service_FS, "Registering program %016" PRIX64 " with the SelfNCCH archive factory",
+              program_id);
+
+    if (ncch_data.find(program_id) != ncch_data.end()) {
+        LOG_WARNING(Service_FS, "Registering program %016" PRIX64
+                                " with SelfNCCH will override existing mapping",
+                    program_id);
+    }
+
+    NCCHData& data = ncch_data[program_id];
+
     std::shared_ptr<FileUtil::IOFile> romfs_file_;
     if (Loader::ResultStatus::Success ==
-        app_loader.ReadRomFS(romfs_file_, ncch_data.romfs_offset, ncch_data.romfs_size)) {
+        app_loader.ReadRomFS(romfs_file_, data.romfs_offset, data.romfs_size)) {
+
+        data.romfs_file = std::move(romfs_file_);
+    }
+
+    std::shared_ptr<FileUtil::IOFile> update_romfs_file;
+    if (Loader::ResultStatus::Success ==
+        app_loader.ReadUpdateRomFS(update_romfs_file, data.update_romfs_offset,
+                                   data.update_romfs_size)) {
 
-        ncch_data.romfs_file = std::move(romfs_file_);
+        data.update_romfs_file = std::move(update_romfs_file);
     }
 
     std::vector<u8> buffer;
 
     if (Loader::ResultStatus::Success == app_loader.ReadIcon(buffer))
-        ncch_data.icon = std::make_shared<std::vector<u8>>(std::move(buffer));
+        data.icon = std::make_shared<std::vector<u8>>(std::move(buffer));
 
     buffer.clear();
     if (Loader::ResultStatus::Success == app_loader.ReadLogo(buffer))
-        ncch_data.logo = std::make_shared<std::vector<u8>>(std::move(buffer));
+        data.logo = std::make_shared<std::vector<u8>>(std::move(buffer));
 
     buffer.clear();
     if (Loader::ResultStatus::Success == app_loader.ReadBanner(buffer))
-        ncch_data.banner = std::make_shared<std::vector<u8>>(std::move(buffer));
+        data.banner = std::make_shared<std::vector<u8>>(std::move(buffer));
 }
 
 ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SelfNCCH::Open(const Path& path) {
-    auto archive = std::make_unique<SelfNCCHArchive>(ncch_data);
-    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+    //auto archive = std::make_unique<SelfNCCHArchive>(
+    //    ncch_data[Kernel::g_current_process->codeset->program_id]);
+    //return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+    return {};
 }
 
 ResultCode ArchiveFactory_SelfNCCH::Format(const Path&, const FileSys::ArchiveFormatInfo&) {
diff --git a/src/core/file_sys/archive_selfncch.h b/src/core/file_sys/archive_selfncch.h
index f1b971296..0d6d6766e 100644
--- a/src/core/file_sys/archive_selfncch.h
+++ b/src/core/file_sys/archive_selfncch.h
@@ -6,6 +6,7 @@
 
 #include <memory>
 #include <string>
+#include <unordered_map>
 #include <vector>
 #include "common/common_types.h"
 #include "core/file_sys/archive_backend.h"
@@ -24,12 +25,19 @@ struct NCCHData {
     std::shared_ptr<FileUtil::IOFile> romfs_file;
     u64 romfs_offset = 0;
     u64 romfs_size = 0;
+
+    std::shared_ptr<FileUtil::IOFile> update_romfs_file;
+    u64 update_romfs_offset = 0;
+    u64 update_romfs_size = 0;
 };
 
 /// File system interface to the SelfNCCH archive
 class ArchiveFactory_SelfNCCH final : public ArchiveFactory {
 public:
-    explicit ArchiveFactory_SelfNCCH(Loader::AppLoader& app_loader);
+    ArchiveFactory_SelfNCCH() = default;
+
+    /// Registers a loaded application so that we can open its SelfNCCH archive when requested.
+    void Register(Loader::AppLoader& app_loader);
 
     std::string GetName() const override {
         return "SelfNCCH";
@@ -39,7 +47,8 @@ public:
     ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
 
 private:
-    NCCHData ncch_data;
+    /// Mapping of ProgramId -> NCCHData
+    std::unordered_map<u64, NCCHData> ncch_data;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/ncch_container.cpp b/src/core/file_sys/ncch_container.cpp
new file mode 100644
index 000000000..b9fb940c7
--- /dev/null
+++ b/src/core/file_sys/ncch_container.cpp
@@ -0,0 +1,423 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cinttypes>
+#include <cstring>
+#include <memory>
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "core/core.h"
+#include "core/file_sys/ncch_container.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+static const int kMaxSections = 8;   ///< Maximum number of sections (files) in an ExeFs
+static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
+
+/**
+ * Get the decompressed size of an LZSS compressed ExeFS file
+ * @param buffer Buffer of compressed file
+ * @param size Size of compressed buffer
+ * @return Size of decompressed buffer
+ */
+static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
+    u32 offset_size = *(u32*)(buffer + size - 4);
+    return offset_size + size;
+}
+
+/**
+ * Decompress ExeFS file (compressed with LZSS)
+ * @param compressed Compressed buffer
+ * @param compressed_size Size of compressed buffer
+ * @param decompressed Decompressed buffer
+ * @param decompressed_size Size of decompressed buffer
+ * @return True on success, otherwise false
+ */
+static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed,
+                            u32 decompressed_size) {
+    const u8* footer = compressed + compressed_size - 8;
+    u32 buffer_top_and_bottom = *reinterpret_cast<const u32*>(footer);
+    u32 out = decompressed_size;
+    u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
+    u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
+
+    memset(decompressed, 0, decompressed_size);
+    memcpy(decompressed, compressed, compressed_size);
+
+    while (index > stop_index) {
+        u8 control = compressed[--index];
+
+        for (unsigned i = 0; i < 8; i++) {
+            if (index <= stop_index)
+                break;
+            if (index <= 0)
+                break;
+            if (out <= 0)
+                break;
+
+            if (control & 0x80) {
+                // Check if compression is out of bounds
+                if (index < 2)
+                    return false;
+                index -= 2;
+
+                u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
+                u32 segment_size = ((segment_offset >> 12) & 15) + 3;
+                segment_offset &= 0x0FFF;
+                segment_offset += 2;
+
+                // Check if compression is out of bounds
+                if (out < segment_size)
+                    return false;
+
+                for (unsigned j = 0; j < segment_size; j++) {
+                    // Check if compression is out of bounds
+                    if (out + segment_offset >= decompressed_size)
+                        return false;
+
+                    u8 data = decompressed[out + segment_offset];
+                    decompressed[--out] = data;
+                }
+            } else {
+                // Check if compression is out of bounds
+                if (out < 1)
+                    return false;
+                decompressed[--out] = compressed[--index];
+            }
+            control <<= 1;
+        }
+    }
+    return true;
+}
+
+NCCHContainer::NCCHContainer(const std::string& filepath) : filepath(filepath) {
+    file = FileUtil::IOFile(filepath, "rb");
+}
+
+Loader::ResultStatus NCCHContainer::OpenFile(const std::string& filepath) {
+    this->filepath = filepath;
+    file = FileUtil::IOFile(filepath, "rb");
+
+    if (!file.IsOpen()) {
+        LOG_WARNING(Service_FS, "Failed to open %s", filepath.c_str());
+        return Loader::ResultStatus::Error;
+    }
+
+    LOG_DEBUG(Service_FS, "Opened %s", filepath.c_str());
+    return Loader::ResultStatus::Success;
+}
+
+Loader::ResultStatus NCCHContainer::Load() {
+    if (is_loaded)
+        return Loader::ResultStatus::Success;
+
+    if (file.IsOpen()) {
+        // Reset read pointer in case this file has been read before.
+        file.Seek(0, SEEK_SET);
+
+        if (file.ReadBytes(&ncch_header, sizeof(NCCH_Header)) != sizeof(NCCH_Header))
+            return Loader::ResultStatus::Error;
+
+        // Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
+        if (Loader::MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) {
+            LOG_DEBUG(Service_FS, "Only loading the first (bootable) NCCH within the NCSD file!");
+            ncch_offset = 0x4000;
+            file.Seek(ncch_offset, SEEK_SET);
+            file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
+        }
+
+        // Verify we are loading the correct file type...
+        if (Loader::MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic)
+            return Loader::ResultStatus::ErrorInvalidFormat;
+
+        has_header = true;
+
+        // System archives and DLC don't have an extended header but have RomFS
+        if (ncch_header.extended_header_size) {
+            if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) !=
+                sizeof(ExHeader_Header))
+                return Loader::ResultStatus::Error;
+
+            is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
+            u32 entry_point = exheader_header.codeset_info.text.address;
+            u32 code_size = exheader_header.codeset_info.text.code_size;
+            u32 stack_size = exheader_header.codeset_info.stack_size;
+            u32 bss_size = exheader_header.codeset_info.bss_size;
+            u32 core_version = exheader_header.arm11_system_local_caps.core_version;
+            u8 priority = exheader_header.arm11_system_local_caps.priority;
+            u8 resource_limit_category =
+                exheader_header.arm11_system_local_caps.resource_limit_category;
+
+            LOG_DEBUG(Service_FS, "Name:                        %s",
+                      exheader_header.codeset_info.name);
+            LOG_DEBUG(Service_FS, "Program ID:                  %016" PRIX64,
+                      ncch_header.program_id);
+            LOG_DEBUG(Service_FS, "Code compressed:             %s", is_compressed ? "yes" : "no");
+            LOG_DEBUG(Service_FS, "Entry point:                 0x%08X", entry_point);
+            LOG_DEBUG(Service_FS, "Code size:                   0x%08X", code_size);
+            LOG_DEBUG(Service_FS, "Stack size:                  0x%08X", stack_size);
+            LOG_DEBUG(Service_FS, "Bss size:                    0x%08X", bss_size);
+            LOG_DEBUG(Service_FS, "Core version:                %d", core_version);
+            LOG_DEBUG(Service_FS, "Thread priority:             0x%X", priority);
+            LOG_DEBUG(Service_FS, "Resource limit category:     %d", resource_limit_category);
+            LOG_DEBUG(Service_FS, "System Mode:                 %d",
+                      static_cast<int>(exheader_header.arm11_system_local_caps.system_mode));
+
+            if (exheader_header.system_info.jump_id != ncch_header.program_id) {
+                LOG_ERROR(Service_FS,
+                          "ExHeader Program ID mismatch: the ROM is probably encrypted.");
+                return Loader::ResultStatus::ErrorEncrypted;
+            }
+
+            has_exheader = true;
+        }
+
+        // DLC can have an ExeFS and a RomFS but no extended header
+        if (ncch_header.exefs_size) {
+            exefs_offset = ncch_header.exefs_offset * kBlockSize;
+            u32 exefs_size = ncch_header.exefs_size * kBlockSize;
+
+            LOG_DEBUG(Service_FS, "ExeFS offset:                0x%08X", exefs_offset);
+            LOG_DEBUG(Service_FS, "ExeFS size:                  0x%08X", exefs_size);
+
+            file.Seek(exefs_offset + ncch_offset, SEEK_SET);
+            if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header))
+                return Loader::ResultStatus::Error;
+
+            exefs_file = FileUtil::IOFile(filepath, "rb");
+            has_exefs = true;
+        }
+
+        if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0)
+            has_romfs = true;
+    }
+
+    LoadOverrides();
+
+    // We need at least one of these or overrides, practically
+    if (!(has_exefs || has_romfs || is_tainted))
+        return Loader::ResultStatus::Error;
+
+    is_loaded = true;
+    return Loader::ResultStatus::Success;
+}
+
+Loader::ResultStatus NCCHContainer::LoadOverrides() {
+    // Check for split-off files, mark the archive as tainted if we will use them
+    std::string romfs_override = filepath + ".romfs";
+    if (FileUtil::Exists(romfs_override)) {
+        is_tainted = true;
+    }
+
+    // If we have a split-off exefs file/folder, it takes priority
+    std::string exefs_override = filepath + ".exefs";
+    std::string exefsdir_override = filepath + ".exefsdir/";
+    if (FileUtil::Exists(exefs_override)) {
+        exefs_file = FileUtil::IOFile(exefs_override, "rb");
+
+        if (exefs_file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) == sizeof(ExeFs_Header)) {
+            LOG_DEBUG(Service_FS, "Loading ExeFS section from %s", exefs_override.c_str());
+            exefs_offset = 0;
+            is_tainted = true;
+            has_exefs = true;
+        } else {
+            exefs_file = FileUtil::IOFile(filepath, "rb");
+        }
+    } else if (FileUtil::Exists(exefsdir_override) && FileUtil::IsDirectory(exefsdir_override)) {
+        is_tainted = true;
+    }
+
+    if (is_tainted)
+        LOG_WARNING(Service_FS,
+                    "Loaded NCCH %s is tainted, application behavior may not be as expected!",
+                    filepath.c_str());
+
+    return Loader::ResultStatus::Success;
+}
+
+Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return result;
+
+    // Check if we have files that can drop-in and replace
+    result = LoadOverrideExeFSSection(name, buffer);
+    if (result == Loader::ResultStatus::Success || !has_exefs)
+        return result;
+
+    // If we don't have any separate files, we'll need a full ExeFS
+    if (!exefs_file.IsOpen())
+        return Loader::ResultStatus::Error;
+
+    LOG_DEBUG(Service_FS, "%d sections:", kMaxSections);
+    // Iterate through the ExeFs archive until we find a section with the specified name...
+    for (unsigned section_number = 0; section_number < kMaxSections; section_number++) {
+        const auto& section = exefs_header.section[section_number];
+
+        // Load the specified section...
+        if (strcmp(section.name, name) == 0) {
+            LOG_DEBUG(Service_FS, "%d - offset: 0x%08X, size: 0x%08X, name: %s", section_number,
+                      section.offset, section.size, section.name);
+
+            s64 section_offset =
+                (section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset);
+            exefs_file.Seek(section_offset, SEEK_SET);
+
+            if (strcmp(section.name, ".code") == 0 && is_compressed) {
+                // Section is compressed, read compressed .code section...
+                std::unique_ptr<u8[]> temp_buffer;
+                try {
+                    temp_buffer.reset(new u8[section.size]);
+                } catch (std::bad_alloc&) {
+                    return Loader::ResultStatus::ErrorMemoryAllocationFailed;
+                }
+
+                if (exefs_file.ReadBytes(&temp_buffer[0], section.size) != section.size)
+                    return Loader::ResultStatus::Error;
+
+                // Decompress .code section...
+                u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size);
+                buffer.resize(decompressed_size);
+                if (!LZSS_Decompress(&temp_buffer[0], section.size, &buffer[0], decompressed_size))
+                    return Loader::ResultStatus::ErrorInvalidFormat;
+            } else {
+                // Section is uncompressed...
+                buffer.resize(section.size);
+                if (exefs_file.ReadBytes(&buffer[0], section.size) != section.size)
+                    return Loader::ResultStatus::Error;
+            }
+            return Loader::ResultStatus::Success;
+        }
+    }
+    return Loader::ResultStatus::ErrorNotUsed;
+}
+
+Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
+                                                             std::vector<u8>& buffer) {
+    std::string override_name;
+
+    // Map our section name to the extracted equivalent
+    if (!strcmp(name, ".code"))
+        override_name = "code.bin";
+    else if (!strcmp(name, "icon"))
+        override_name = "code.bin";
+    else if (!strcmp(name, "banner"))
+        override_name = "banner.bnr";
+    else if (!strcmp(name, "logo"))
+        override_name = "logo.bcma.lz";
+    else
+        return Loader::ResultStatus::Error;
+
+    std::string section_override = filepath + ".exefsdir/" + override_name;
+    FileUtil::IOFile section_file(section_override, "rb");
+
+    if (section_file.IsOpen()) {
+        auto section_size = section_file.GetSize();
+        buffer.resize(section_size);
+
+        section_file.Seek(0, SEEK_SET);
+        if (section_file.ReadBytes(&buffer[0], section_size) == section_size) {
+            LOG_WARNING(Service_FS, "File %s overriding built-in ExeFS file",
+                        section_override.c_str());
+            return Loader::ResultStatus::Success;
+        }
+    }
+    return Loader::ResultStatus::ErrorNotUsed;
+}
+
+Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
+                                              u64& offset, u64& size) {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return result;
+
+    if (ReadOverrideRomFS(romfs_file, offset, size) == Loader::ResultStatus::Success)
+        return Loader::ResultStatus::Success;
+
+    if (!has_romfs) {
+        LOG_DEBUG(Service_FS, "RomFS requested from NCCH which has no RomFS");
+        return Loader::ResultStatus::ErrorNotUsed;
+    }
+
+    if (!file.IsOpen())
+        return Loader::ResultStatus::Error;
+
+    u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
+    u32 romfs_size = (ncch_header.romfs_size * kBlockSize) - 0x1000;
+
+    LOG_DEBUG(Service_FS, "RomFS offset:           0x%08X", romfs_offset);
+    LOG_DEBUG(Service_FS, "RomFS size:             0x%08X", romfs_size);
+
+    if (file.GetSize() < romfs_offset + romfs_size)
+        return Loader::ResultStatus::Error;
+
+    // We reopen the file, to allow its position to be independent from file's
+    romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
+    if (!romfs_file->IsOpen())
+        return Loader::ResultStatus::Error;
+
+    offset = romfs_offset;
+    size = romfs_size;
+
+    return Loader::ResultStatus::Success;
+}
+
+Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
+                                                      u64& offset, u64& size) {
+    // Check for RomFS overrides
+    std::string split_filepath = filepath + ".romfs";
+    if (FileUtil::Exists(split_filepath)) {
+        romfs_file = std::make_shared<FileUtil::IOFile>(split_filepath, "rb");
+        if (romfs_file->IsOpen()) {
+            LOG_WARNING(Service_FS, "File %s overriding built-in RomFS", split_filepath.c_str());
+            offset = 0;
+            size = romfs_file->GetSize();
+            return Loader::ResultStatus::Success;
+        }
+    }
+
+    return Loader::ResultStatus::ErrorNotUsed;
+}
+
+Loader::ResultStatus NCCHContainer::ReadProgramId(u64_le& program_id) {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return result;
+
+    if (!has_header)
+        return Loader::ResultStatus::ErrorNotUsed;
+
+    program_id = ncch_header.program_id;
+    return Loader::ResultStatus::Success;
+}
+
+bool NCCHContainer::HasExeFS() {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return false;
+
+    return has_exefs;
+}
+
+bool NCCHContainer::HasRomFS() {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return false;
+
+    return has_romfs;
+}
+
+bool NCCHContainer::HasExHeader() {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return false;
+
+    return has_exheader;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/ncch_container.h b/src/core/file_sys/ncch_container.h
new file mode 100644
index 000000000..2cc9d13dc
--- /dev/null
+++ b/src/core/file_sys/ncch_container.h
@@ -0,0 +1,274 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <memory>
+#include <string>
+#include <vector>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "common/file_util.h"
+#include "common/swap.h"
+#include "core/core.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+/// NCCH header (Note: "NCCH" appears to be a publicly unknown acronym)
+
+struct NCCH_Header {
+    u8 signature[0x100];
+    u32_le magic;
+    u32_le content_size;
+    u8 partition_id[8];
+    u16_le maker_code;
+    u16_le version;
+    u8 reserved_0[4];
+    u64_le program_id;
+    u8 reserved_1[0x10];
+    u8 logo_region_hash[0x20];
+    u8 product_code[0x10];
+    u8 extended_header_hash[0x20];
+    u32_le extended_header_size;
+    u8 reserved_2[4];
+    u8 flags[8];
+    u32_le plain_region_offset;
+    u32_le plain_region_size;
+    u32_le logo_region_offset;
+    u32_le logo_region_size;
+    u32_le exefs_offset;
+    u32_le exefs_size;
+    u32_le exefs_hash_region_size;
+    u8 reserved_3[4];
+    u32_le romfs_offset;
+    u32_le romfs_size;
+    u32_le romfs_hash_region_size;
+    u8 reserved_4[4];
+    u8 exefs_super_block_hash[0x20];
+    u8 romfs_super_block_hash[0x20];
+};
+
+static_assert(sizeof(NCCH_Header) == 0x200, "NCCH header structure size is wrong");
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// ExeFS (executable file system) headers
+
+struct ExeFs_SectionHeader {
+    char name[8];
+    u32 offset;
+    u32 size;
+};
+
+struct ExeFs_Header {
+    ExeFs_SectionHeader section[8];
+    u8 reserved[0x80];
+    u8 hashes[8][0x20];
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// ExHeader (executable file system header) headers
+
+struct ExHeader_SystemInfoFlags {
+    u8 reserved[5];
+    u8 flag;
+    u8 remaster_version[2];
+};
+
+struct ExHeader_CodeSegmentInfo {
+    u32 address;
+    u32 num_max_pages;
+    u32 code_size;
+};
+
+struct ExHeader_CodeSetInfo {
+    u8 name[8];
+    ExHeader_SystemInfoFlags flags;
+    ExHeader_CodeSegmentInfo text;
+    u32 stack_size;
+    ExHeader_CodeSegmentInfo ro;
+    u8 reserved[4];
+    ExHeader_CodeSegmentInfo data;
+    u32 bss_size;
+};
+
+struct ExHeader_DependencyList {
+    u8 program_id[0x30][8];
+};
+
+struct ExHeader_SystemInfo {
+    u64 save_data_size;
+    u64_le jump_id;
+    u8 reserved_2[0x30];
+};
+
+struct ExHeader_StorageInfo {
+    u8 ext_save_data_id[8];
+    u8 system_save_data_id[8];
+    u8 reserved[8];
+    u8 access_info[7];
+    u8 other_attributes;
+};
+
+struct ExHeader_ARM11_SystemLocalCaps {
+    u64_le program_id;
+    u32_le core_version;
+    u8 reserved_flags[2];
+    union {
+        u8 flags0;
+        BitField<0, 2, u8> ideal_processor;
+        BitField<2, 2, u8> affinity_mask;
+        BitField<4, 4, u8> system_mode;
+    };
+    u8 priority;
+    u8 resource_limit_descriptor[0x10][2];
+    ExHeader_StorageInfo storage_info;
+    u8 service_access_control[0x20][8];
+    u8 ex_service_access_control[0x2][8];
+    u8 reserved[0xf];
+    u8 resource_limit_category;
+};
+
+struct ExHeader_ARM11_KernelCaps {
+    u32_le descriptors[28];
+    u8 reserved[0x10];
+};
+
+struct ExHeader_ARM9_AccessControl {
+    u8 descriptors[15];
+    u8 descversion;
+};
+
+struct ExHeader_Header {
+    ExHeader_CodeSetInfo codeset_info;
+    ExHeader_DependencyList dependency_list;
+    ExHeader_SystemInfo system_info;
+    ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps;
+    ExHeader_ARM11_KernelCaps arm11_kernel_caps;
+    ExHeader_ARM9_AccessControl arm9_access_control;
+    struct {
+        u8 signature[0x100];
+        u8 ncch_public_key_modulus[0x100];
+        ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps;
+        ExHeader_ARM11_KernelCaps arm11_kernel_caps;
+        ExHeader_ARM9_AccessControl arm9_access_control;
+    } access_desc;
+};
+
+static_assert(sizeof(ExHeader_Header) == 0x800, "ExHeader structure size is wrong");
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+/**
+ * Helper which implements an interface to deal with NCCH containers which can
+ * contain ExeFS archives or RomFS archives for games or other applications.
+ */
+class NCCHContainer {
+public:
+    NCCHContainer(const std::string& filepath);
+    NCCHContainer() {}
+
+    Loader::ResultStatus OpenFile(const std::string& filepath);
+
+    /**
+     * Ensure ExeFS and exheader is loaded and ready for reading sections
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus Load();
+
+    /**
+     * Attempt to find overridden sections for the NCCH and mark the container as tainted
+     * if any are found.
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus LoadOverrides();
+
+    /**
+     * Reads an application ExeFS section of an NCCH file (e.g. .code, .logo, etc.)
+     * @param name Name of section to read out of NCCH file
+     * @param buffer Vector to read data into
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus LoadSectionExeFS(const char* name, std::vector<u8>& buffer);
+
+    /**
+     * Reads an application ExeFS section from external files instead of an NCCH file,
+     * (e.g. code.bin, logo.bcma.lz, icon.icn, banner.bnr)
+     * @param name Name of section to read from external files
+     * @param buffer Vector to read data into
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus LoadOverrideExeFSSection(const char* name, std::vector<u8>& buffer);
+
+    /**
+     * Get the RomFS of the NCCH container
+     * Since the RomFS can be huge, we return a file reference instead of copying to a buffer
+     * @param romfs_file The file containing the RomFS
+     * @param offset The offset the romfs begins on
+     * @param size The size of the romfs
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
+                                   u64& size);
+
+    /**
+    * Get the override RomFS of the NCCH container
+    * Since the RomFS can be huge, we return a file reference instead of copying to a buffer
+    * @param romfs_file The file containing the RomFS
+    * @param offset The offset the romfs begins on
+    * @param size The size of the romfs
+    * @return ResultStatus result of function
+    */
+    Loader::ResultStatus ReadOverrideRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
+                                           u64& offset, u64& size);
+
+    /**
+     * Get the Program ID of the NCCH container
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus ReadProgramId(u64_le& program_id);
+
+    /**
+     * Checks whether the NCCH container contains an ExeFS
+     * @return bool check result
+     */
+    bool HasExeFS();
+
+    /**
+     * Checks whether the NCCH container contains a RomFS
+     * @return bool check result
+     */
+    bool HasRomFS();
+
+    /**
+     * Checks whether the NCCH container contains an ExHeader
+     * @return bool check result
+     */
+    bool HasExHeader();
+
+    NCCH_Header ncch_header;
+    ExeFs_Header exefs_header;
+    ExHeader_Header exheader_header;
+
+private:
+    bool has_header = false;
+    bool has_exheader = false;
+    bool has_exefs = false;
+    bool has_romfs = false;
+
+    bool is_tainted = false; // Are there parts of this container being overridden?
+    bool is_loaded = false;
+    bool is_compressed = false;
+
+    u32 ncch_offset = 0; // Offset to NCCH header, can be 0 or after NCSD header
+    u32 exefs_offset = 0;
+
+    std::string filepath;
+    FileUtil::IOFile file;
+    FileUtil::IOFile exefs_file;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/savedata_archive.cpp b/src/core/file_sys/savedata_archive.cpp
index f540c4a93..f8f811ba0 100644
--- a/src/core/file_sys/savedata_archive.cpp
+++ b/src/core/file_sys/savedata_archive.cpp
@@ -106,7 +106,25 @@ ResultCode SaveDataArchive::DeleteFile(const Path& path) const {
 }
 
 ResultCode SaveDataArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
-    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString())) {
+    const PathParser path_parser_src(src_path);
+
+    // TODO: Verify these return codes with HW
+    if (!path_parser_src.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid src path %s", src_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const PathParser path_parser_dest(dest_path);
+
+    if (!path_parser_dest.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid dest path %s", dest_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto src_path_full = path_parser_src.BuildHostPath(mount_point);
+    const auto dest_path_full = path_parser_dest.BuildHostPath(mount_point);
+
+    if (FileUtil::Rename(src_path_full, dest_path_full)) {
         return RESULT_SUCCESS;
     }
 
@@ -247,8 +265,27 @@ ResultCode SaveDataArchive::CreateDirectory(const Path& path) const {
 }
 
 ResultCode SaveDataArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
-    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString()))
+    const PathParser path_parser_src(src_path);
+
+    // TODO: Verify these return codes with HW
+    if (!path_parser_src.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid src path %s", src_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const PathParser path_parser_dest(dest_path);
+
+    if (!path_parser_dest.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid dest path %s", dest_path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto src_path_full = path_parser_src.BuildHostPath(mount_point);
+    const auto dest_path_full = path_parser_dest.BuildHostPath(mount_point);
+
+    if (FileUtil::Rename(src_path_full, dest_path_full)) {
         return RESULT_SUCCESS;
+    }
 
     // TODO(yuriks): This code probably isn't right, it'll return a Status even if the file didn't
     // exist or similar. Verify.
diff --git a/src/core/file_sys/title_metadata.cpp b/src/core/file_sys/title_metadata.cpp
new file mode 100644
index 000000000..1ef8840a0
--- /dev/null
+++ b/src/core/file_sys/title_metadata.cpp
@@ -0,0 +1,212 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cinttypes>
+#include <cryptopp/sha.h>
+#include "common/alignment.h"
+#include "common/file_util.h"
+#include "common/logging/log.h"
+#include "core/file_sys/title_metadata.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+static u32 GetSignatureSize(u32 signature_type) {
+    switch (signature_type) {
+    case Rsa4096Sha1:
+    case Rsa4096Sha256:
+        return 0x200;
+
+    case Rsa2048Sha1:
+    case Rsa2048Sha256:
+        return 0x100;
+
+    case EllipticSha1:
+    case EcdsaSha256:
+        return 0x3C;
+    }
+}
+
+Loader::ResultStatus TitleMetadata::Load() {
+    FileUtil::IOFile file(filepath, "rb");
+    if (!file.IsOpen())
+        return Loader::ResultStatus::Error;
+
+    if (!file.ReadBytes(&signature_type, sizeof(u32_be)))
+        return Loader::ResultStatus::Error;
+
+    // Signature lengths are variable, and the body follows the signature
+    u32 signature_size = GetSignatureSize(signature_type);
+
+    tmd_signature.resize(signature_size);
+    if (!file.ReadBytes(&tmd_signature[0], signature_size))
+        return Loader::ResultStatus::Error;
+
+    // The TMD body start position is rounded to the nearest 0x40 after the signature
+    size_t body_start = Common::AlignUp(signature_size + sizeof(u32), 0x40);
+    file.Seek(body_start, SEEK_SET);
+
+    // Read our TMD body, then load the amount of ContentChunks specified
+    if (file.ReadBytes(&tmd_body, sizeof(TitleMetadata::Body)) != sizeof(TitleMetadata::Body))
+        return Loader::ResultStatus::Error;
+
+    for (u16 i = 0; i < tmd_body.content_count; i++) {
+        ContentChunk chunk;
+        if (file.ReadBytes(&chunk, sizeof(ContentChunk)) == sizeof(ContentChunk)) {
+            tmd_chunks.push_back(chunk);
+        } else {
+            LOG_ERROR(Service_FS, "Malformed TMD %s, failed to load content chunk index %u!",
+                      filepath.c_str(), i);
+            return Loader::ResultStatus::ErrorInvalidFormat;
+        }
+    }
+
+    return Loader::ResultStatus::Success;
+}
+
+Loader::ResultStatus TitleMetadata::Save() {
+    FileUtil::IOFile file(filepath, "wb");
+    if (!file.IsOpen())
+        return Loader::ResultStatus::Error;
+
+    if (!file.WriteBytes(&signature_type, sizeof(u32_be)))
+        return Loader::ResultStatus::Error;
+
+    // Signature lengths are variable, and the body follows the signature
+    u32 signature_size = GetSignatureSize(signature_type);
+
+    if (!file.WriteBytes(tmd_signature.data(), signature_size))
+        return Loader::ResultStatus::Error;
+
+    // The TMD body start position is rounded to the nearest 0x40 after the signature
+    size_t body_start = Common::AlignUp(signature_size + sizeof(u32), 0x40);
+    file.Seek(body_start, SEEK_SET);
+
+    // Update our TMD body values and hashes
+    tmd_body.content_count = static_cast<u16>(tmd_chunks.size());
+
+    // TODO(shinyquagsire23): Do TMDs with more than one contentinfo exist?
+    // For now we'll just adjust the first index to hold all content chunks
+    // and ensure that no further content info data exists.
+    tmd_body.contentinfo = {};
+    tmd_body.contentinfo[0].index = 0;
+    tmd_body.contentinfo[0].command_count = static_cast<u16>(tmd_chunks.size());
+
+    CryptoPP::SHA256 chunk_hash;
+    for (u16 i = 0; i < tmd_body.content_count; i++) {
+        chunk_hash.Update(reinterpret_cast<u8*>(&tmd_chunks[i]), sizeof(ContentChunk));
+    }
+    chunk_hash.Final(tmd_body.contentinfo[0].hash.data());
+
+    CryptoPP::SHA256 contentinfo_hash;
+    for (size_t i = 0; i < tmd_body.contentinfo.size(); i++) {
+        chunk_hash.Update(reinterpret_cast<u8*>(&tmd_body.contentinfo[i]), sizeof(ContentInfo));
+    }
+    chunk_hash.Final(tmd_body.contentinfo_hash.data());
+
+    // Write our TMD body, then write each of our ContentChunks
+    if (file.WriteBytes(&tmd_body, sizeof(TitleMetadata::Body)) != sizeof(TitleMetadata::Body))
+        return Loader::ResultStatus::Error;
+
+    for (u16 i = 0; i < tmd_body.content_count; i++) {
+        ContentChunk chunk = tmd_chunks[i];
+        if (file.WriteBytes(&chunk, sizeof(ContentChunk)) != sizeof(ContentChunk))
+            return Loader::ResultStatus::Error;
+    }
+
+    return Loader::ResultStatus::Success;
+}
+
+u64 TitleMetadata::GetTitleID() const {
+    return tmd_body.title_id;
+}
+
+u32 TitleMetadata::GetTitleType() const {
+    return tmd_body.title_type;
+}
+
+u16 TitleMetadata::GetTitleVersion() const {
+    return tmd_body.title_version;
+}
+
+u64 TitleMetadata::GetSystemVersion() const {
+    return tmd_body.system_version;
+}
+
+size_t TitleMetadata::GetContentCount() const {
+    return tmd_chunks.size();
+}
+
+u32 TitleMetadata::GetBootContentID() const {
+    return tmd_chunks[TMDContentIndex::Main].id;
+}
+
+u32 TitleMetadata::GetManualContentID() const {
+    return tmd_chunks[TMDContentIndex::Manual].id;
+}
+
+u32 TitleMetadata::GetDLPContentID() const {
+    return tmd_chunks[TMDContentIndex::DLP].id;
+}
+
+void TitleMetadata::SetTitleID(u64 title_id) {
+    tmd_body.title_id = title_id;
+}
+
+void TitleMetadata::SetTitleType(u32 type) {
+    tmd_body.title_type = type;
+}
+
+void TitleMetadata::SetTitleVersion(u16 version) {
+    tmd_body.title_version = version;
+}
+
+void TitleMetadata::SetSystemVersion(u64 version) {
+    tmd_body.system_version = version;
+}
+
+void TitleMetadata::AddContentChunk(const ContentChunk& chunk) {
+    tmd_chunks.push_back(chunk);
+}
+
+void TitleMetadata::Print() const {
+    LOG_DEBUG(Service_FS, "%s - %u chunks", filepath.c_str(),
+              static_cast<u32>(tmd_body.content_count));
+
+    // Content info describes ranges of content chunks
+    LOG_DEBUG(Service_FS, "Content info:");
+    for (size_t i = 0; i < tmd_body.contentinfo.size(); i++) {
+        if (tmd_body.contentinfo[i].command_count == 0)
+            break;
+
+        LOG_DEBUG(Service_FS, "    Index %04X, Command Count %04X",
+                  static_cast<u32>(tmd_body.contentinfo[i].index),
+                  static_cast<u32>(tmd_body.contentinfo[i].command_count));
+    }
+
+    // For each content info, print their content chunk range
+    for (size_t i = 0; i < tmd_body.contentinfo.size(); i++) {
+        u16 index = static_cast<u16>(tmd_body.contentinfo[i].index);
+        u16 count = static_cast<u16>(tmd_body.contentinfo[i].command_count);
+
+        if (count == 0)
+            continue;
+
+        LOG_DEBUG(Service_FS, "Content chunks for content info index %zu:", i);
+        for (u16 j = index; j < index + count; j++) {
+            // Don't attempt to print content we don't have
+            if (j > tmd_body.content_count)
+                break;
+
+            const ContentChunk& chunk = tmd_chunks[j];
+            LOG_DEBUG(Service_FS, "    ID %08X, Index %04X, Type %04x, Size %016" PRIX64,
+                      static_cast<u32>(chunk.id), static_cast<u32>(chunk.index),
+                      static_cast<u32>(chunk.type), static_cast<u64>(chunk.size));
+        }
+    }
+}
+} // namespace FileSys
diff --git a/src/core/file_sys/title_metadata.h b/src/core/file_sys/title_metadata.h
new file mode 100644
index 000000000..1fc157bf3
--- /dev/null
+++ b/src/core/file_sys/title_metadata.h
@@ -0,0 +1,125 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include "common/common_types.h"
+#include "common/swap.h"
+
+namespace Loader {
+enum class ResultStatus;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+enum TMDSignatureType : u32 {
+    Rsa4096Sha1 = 0x10000,
+    Rsa2048Sha1 = 0x10001,
+    EllipticSha1 = 0x10002,
+    Rsa4096Sha256 = 0x10003,
+    Rsa2048Sha256 = 0x10004,
+    EcdsaSha256 = 0x10005
+};
+
+enum TMDContentTypeFlag : u16 {
+    Encrypted = 1 << 1,
+    Disc = 1 << 2,
+    CFM = 1 << 3,
+    Optional = 1 << 14,
+    Shared = 1 << 15
+};
+
+/**
+ * Helper which implements an interface to read and write Title Metadata (TMD) files.
+ * If a file path is provided and the file exists, it can be parsed and used, otherwise
+ * it must be created. The TMD file can then be interpreted, modified and/or saved.
+ */
+class TitleMetadata {
+public:
+    struct ContentChunk {
+        u32_be id;
+        u16_be index;
+        u16_be type;
+        u64_be size;
+        std::array<u8, 0x20> hash;
+    };
+
+    static_assert(sizeof(ContentChunk) == 0x30, "TMD ContentChunk structure size is wrong");
+
+    struct ContentInfo {
+        u16_be index;
+        u16_be command_count;
+        std::array<u8, 0x20> hash;
+    };
+
+    static_assert(sizeof(ContentInfo) == 0x24, "TMD ContentInfo structure size is wrong");
+
+#pragma pack(push, 1)
+
+    struct Body {
+        std::array<u8, 0x40> issuer;
+        u8 version;
+        u8 ca_crl_version;
+        u8 signer_crl_version;
+        u8 reserved;
+        u64_be system_version;
+        u64_be title_id;
+        u32_be title_type;
+        u16_be group_id;
+        u32_be savedata_size;
+        u32_be srl_private_savedata_size;
+        std::array<u8, 4> reserved_2;
+        u8 srl_flag;
+        std::array<u8, 0x31> reserved_3;
+        u32_be access_rights;
+        u16_be title_version;
+        u16_be content_count;
+        u16_be boot_content;
+        std::array<u8, 2> reserved_4;
+        std::array<u8, 0x20> contentinfo_hash;
+        std::array<ContentInfo, 64> contentinfo;
+    };
+
+    static_assert(sizeof(Body) == 0x9C4, "TMD body structure size is wrong");
+
+#pragma pack(pop)
+
+    explicit TitleMetadata(std::string& path) : filepath(std::move(path)) {}
+    Loader::ResultStatus Load();
+    Loader::ResultStatus Save();
+
+    u64 GetTitleID() const;
+    u32 GetTitleType() const;
+    u16 GetTitleVersion() const;
+    u64 GetSystemVersion() const;
+    size_t GetContentCount() const;
+    u32 GetBootContentID() const;
+    u32 GetManualContentID() const;
+    u32 GetDLPContentID() const;
+
+    void SetTitleID(u64 title_id);
+    void SetTitleType(u32 type);
+    void SetTitleVersion(u16 version);
+    void SetSystemVersion(u64 version);
+    void AddContentChunk(const ContentChunk& chunk);
+
+    void Print() const;
+
+private:
+    enum TMDContentIndex { Main = 0, Manual = 1, DLP = 2 };
+
+    Body tmd_body;
+    u32_be signature_type;
+    std::vector<u8> tmd_signature;
+    std::vector<ContentChunk> tmd_chunks;
+
+    std::string filepath;
+};
+
+} // namespace FileSys