5 files changed, 318 insertions, 0 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index b178914dd..a4aa90477 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -24,6 +24,7 @@ set(SRCS
             file_sys/archive_savedata.cpp
             file_sys/archive_sdmc.cpp
             file_sys/archive_sdmcwriteonly.cpp
+            file_sys/archive_selfncch.cpp
             file_sys/archive_source_sd_savedata.cpp
             file_sys/archive_systemsavedata.cpp
             file_sys/disk_archive.cpp
@@ -201,6 +202,7 @@ set(HEADERS
             file_sys/archive_savedata.h
             file_sys/archive_sdmc.h
             file_sys/archive_sdmcwriteonly.h
+            file_sys/archive_selfncch.h
             file_sys/archive_source_sd_savedata.h
             file_sys/archive_systemsavedata.h
             file_sys/directory_backend.h
diff --git a/src/core/file_sys/archive_selfncch.cpp b/src/core/file_sys/archive_selfncch.cpp
new file mode 100644
index 000000000..298a37a44
--- /dev/null
+++ b/src/core/file_sys/archive_selfncch.cpp
@@ -0,0 +1,257 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <array>
+#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"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+enum class SelfNCCHFilePathType : u32 {
+    RomFS = 0,
+    Code = 1, // This is not supported by SelfNCCHArchive but by archive 0x2345678E
+    ExeFS = 2,
+    UpdateRomFS = 5, // This is presumably for accessing the RomFS of the update patch.
+};
+
+struct SelfNCCHFilePath {
+    u32_le type;
+    std::array<char, 8> exefs_filename;
+};
+static_assert(sizeof(SelfNCCHFilePath) == 12, "NCCHFilePath has wrong size!");
+
+// A read-only file created from a block of data. It only allows you to read the entire file at
+// once, in a single read operation.
+class ExeFSSectionFile final : public FileBackend {
+public:
+    explicit ExeFSSectionFile(std::shared_ptr<std::vector<u8>> data_) : data(std::move(data_)) {}
+
+    ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override {
+        if (offset != 0) {
+            LOG_ERROR(Service_FS, "offset must be zero!");
+            return ERROR_UNSUPPORTED_OPEN_FLAGS;
+        }
+
+        if (length != data->size()) {
+            LOG_ERROR(Service_FS, "size must match the file size!");
+            return ERROR_INCORRECT_EXEFS_READ_SIZE;
+        }
+
+        std::memcpy(buffer, data->data(), data->size());
+        return MakeResult<size_t>(data->size());
+    }
+
+    ResultVal<size_t> Write(u64 offset, size_t length, bool flush,
+                            const u8* buffer) const override {
+        LOG_ERROR(Service_FS, "The file is read-only!");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    u64 GetSize() const override {
+        return data->size();
+    }
+
+    bool SetSize(u64 size) const override {
+        return false;
+    }
+
+    bool Close() const override {
+        return true;
+    }
+
+    void Flush() const override {}
+
+private:
+    std::shared_ptr<std::vector<u8>> data;
+};
+
+// SelfNCCHArchive represents the running application itself. From this archive the application can
+// open RomFS and ExeFS, excluding the .code section.
+class SelfNCCHArchive final : public ArchiveBackend {
+public:
+    explicit SelfNCCHArchive(const NCCHData& ncch_data_) : ncch_data(ncch_data_) {}
+
+    std::string GetName() const override {
+        return "SelfNCCHArchive";
+    }
+
+    ResultVal<std::unique_ptr<FileBackend>> OpenFile(const Path& path, const Mode&) const override {
+        // Note: SelfNCCHArchive doesn't check the open mode.
+
+        if (path.GetType() != LowPathType::Binary) {
+            LOG_ERROR(Service_FS, "Path need to be Binary");
+            return ERROR_INVALID_PATH;
+        }
+
+        std::vector<u8> binary = path.AsBinary();
+        if (binary.size() != sizeof(SelfNCCHFilePath)) {
+            LOG_ERROR(Service_FS, "Wrong path size %zu", binary.size());
+            return ERROR_INVALID_PATH;
+        }
+
+        SelfNCCHFilePath file_path;
+        std::memcpy(&file_path, binary.data(), sizeof(SelfNCCHFilePath));
+
+        switch (static_cast<SelfNCCHFilePathType>(file_path.type)) {
+        case SelfNCCHFilePathType::UpdateRomFS:
+            LOG_WARNING(Service_FS, "(STUBBED) open update RomFS");
+            return OpenRomFS();
+
+        case SelfNCCHFilePathType::RomFS:
+            return OpenRomFS();
+
+        case SelfNCCHFilePathType::Code:
+            LOG_ERROR(Service_FS, "Reading the code section is not supported!");
+            return ERROR_COMMAND_NOT_ALLOWED;
+
+        case SelfNCCHFilePathType::ExeFS: {
+            const auto& raw = file_path.exefs_filename;
+            auto end = std::find(raw.begin(), raw.end(), '\0');
+            std::string filename(raw.begin(), end);
+            return OpenExeFS(filename);
+        }
+        default:
+            LOG_ERROR(Service_FS, "Unknown file type %u!", static_cast<u32>(file_path.type));
+            return ERROR_INVALID_PATH;
+        }
+    }
+
+    ResultCode DeleteFile(const Path& path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode RenameFile(const Path& src_path, const Path& dest_path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode DeleteDirectory(const Path& path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode DeleteDirectoryRecursively(const Path& path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode CreateFile(const Path& path, u64 size) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode CreateDirectory(const Path& path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultCode RenameDirectory(const Path& src_path, const Path& dest_path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    ResultVal<std::unique_ptr<DirectoryBackend>> OpenDirectory(const Path& path) const override {
+        LOG_ERROR(Service_FS, "Unsupported");
+        return ERROR_UNSUPPORTED_OPEN_FLAGS;
+    }
+
+    u64 GetFreeBytes() const override {
+        return 0;
+    }
+
+private:
+    ResultVal<std::unique_ptr<FileBackend>> OpenRomFS() const {
+        if (ncch_data.romfs_file) {
+            return MakeResult<std::unique_ptr<FileBackend>>(std::make_unique<IVFCFile>(
+                ncch_data.romfs_file, ncch_data.romfs_offset, ncch_data.romfs_size));
+        } else {
+            LOG_INFO(Service_FS, "Unable to read RomFS");
+            return ERROR_ROMFS_NOT_FOUND;
+        }
+    }
+
+    ResultVal<std::unique_ptr<FileBackend>> OpenExeFS(const std::string& filename) const {
+        if (filename == "icon") {
+            if (ncch_data.icon) {
+                return MakeResult<std::unique_ptr<FileBackend>>(
+                    std::make_unique<ExeFSSectionFile>(ncch_data.icon));
+            }
+
+            LOG_WARNING(Service_FS, "Unable to read icon");
+            return ERROR_EXEFS_SECTION_NOT_FOUND;
+        }
+
+        if (filename == "logo") {
+            if (ncch_data.logo) {
+                return MakeResult<std::unique_ptr<FileBackend>>(
+                    std::make_unique<ExeFSSectionFile>(ncch_data.logo));
+            }
+
+            LOG_WARNING(Service_FS, "Unable to read logo");
+            return ERROR_EXEFS_SECTION_NOT_FOUND;
+        }
+
+        if (filename == "banner") {
+            if (ncch_data.banner) {
+                return MakeResult<std::unique_ptr<FileBackend>>(
+                    std::make_unique<ExeFSSectionFile>(ncch_data.banner));
+            }
+
+            LOG_WARNING(Service_FS, "Unable to read banner");
+            return ERROR_EXEFS_SECTION_NOT_FOUND;
+        }
+
+        LOG_ERROR(Service_FS, "Unknown ExeFS section %s!", filename.c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    NCCHData ncch_data;
+};
+
+ArchiveFactory_SelfNCCH::ArchiveFactory_SelfNCCH(Loader::AppLoader& app_loader) {
+    std::shared_ptr<FileUtil::IOFile> romfs_file_;
+    if (Loader::ResultStatus::Success ==
+        app_loader.ReadRomFS(romfs_file_, ncch_data.romfs_offset, ncch_data.romfs_size)) {
+
+        ncch_data.romfs_file = std::move(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));
+
+    buffer.clear();
+    if (Loader::ResultStatus::Success == app_loader.ReadLogo(buffer))
+        ncch_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));
+}
+
+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));
+}
+
+ResultCode ArchiveFactory_SelfNCCH::Format(const Path&, const FileSys::ArchiveFormatInfo&) {
+    LOG_ERROR(Service_FS, "Attempted to format a SelfNCCH archive.");
+    return ERROR_INVALID_PATH;
+}
+
+ResultVal<ArchiveFormatInfo> ArchiveFactory_SelfNCCH::GetFormatInfo(const Path&) const {
+    LOG_ERROR(Service_FS, "Attempted to get format info of a SelfNCCH archive");
+    return ERROR_INVALID_PATH;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/archive_selfncch.h b/src/core/file_sys/archive_selfncch.h
new file mode 100644
index 000000000..f1b971296
--- /dev/null
+++ b/src/core/file_sys/archive_selfncch.h
@@ -0,0 +1,45 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <vector>
+#include "common/common_types.h"
+#include "core/file_sys/archive_backend.h"
+#include "core/hle/result.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+struct NCCHData {
+    std::shared_ptr<std::vector<u8>> icon;
+    std::shared_ptr<std::vector<u8>> logo;
+    std::shared_ptr<std::vector<u8>> banner;
+    std::shared_ptr<FileUtil::IOFile> romfs_file;
+    u64 romfs_offset = 0;
+    u64 romfs_size = 0;
+};
+
+/// File system interface to the SelfNCCH archive
+class ArchiveFactory_SelfNCCH final : public ArchiveFactory {
+public:
+    explicit ArchiveFactory_SelfNCCH(Loader::AppLoader& app_loader);
+
+    std::string GetName() const override {
+        return "SelfNCCH";
+    }
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path, const FileSys::ArchiveFormatInfo& format_info) override;
+    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+
+private:
+    NCCHData ncch_data;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/errors.h b/src/core/file_sys/errors.h
index 4d5f62b08..9fc8d753b 100644
--- a/src/core/file_sys/errors.h
+++ b/src/core/file_sys/errors.h
@@ -39,5 +39,15 @@ const ResultCode ERROR_DIRECTORY_NOT_EMPTY(ErrorDescription::FS_DirectoryNotEmpt
 const ResultCode ERROR_GAMECARD_NOT_INSERTED(ErrorDescription::FS_GameCardNotInserted,
                                              ErrorModule::FS, ErrorSummary::NotFound,
                                              ErrorLevel::Status);
+const ResultCode ERROR_INCORRECT_EXEFS_READ_SIZE(ErrorDescription::FS_IncorrectExeFSReadSize,
+                                                 ErrorModule::FS, ErrorSummary::NotSupported,
+                                                 ErrorLevel::Usage);
+const ResultCode ERROR_ROMFS_NOT_FOUND(ErrorDescription::FS_RomFSNotFound, ErrorModule::FS,
+                                       ErrorSummary::NotFound, ErrorLevel::Status);
+const ResultCode ERROR_COMMAND_NOT_ALLOWED(ErrorDescription::FS_CommandNotAllowed, ErrorModule::FS,
+                                           ErrorSummary::WrongArgument, ErrorLevel::Permanent);
+const ResultCode ERROR_EXEFS_SECTION_NOT_FOUND(ErrorDescription::FS_ExeFSSectionNotFound,
+                                               ErrorModule::FS, ErrorSummary::NotFound,
+                                               ErrorLevel::Status);
 
 } // namespace FileSys
diff --git a/src/core/hle/result.h b/src/core/hle/result.h
index 53864a3a7..cfefbbc64 100644
--- a/src/core/hle/result.h
+++ b/src/core/hle/result.h
@@ -20,6 +20,7 @@ enum class ErrorDescription : u32 {
     OS_InvalidBufferDescriptor = 48,
     MaxConnectionsReached = 52,
     WrongAddress = 53,
+    FS_RomFSNotFound = 100,
     FS_ArchiveNotMounted = 101,
     FS_FileNotFound = 112,
     FS_PathNotFound = 113,
@@ -35,10 +36,13 @@ enum class ErrorDescription : u32 {
     OutofRangeOrMisalignedAddress =
         513, // TODO(purpasmart): Check if this name fits its actual usage
     GPU_FirstInitialization = 519,
+    FS_ExeFSSectionNotFound = 567,
+    FS_CommandNotAllowed = 630,
     FS_InvalidReadFlag = 700,
     FS_InvalidPath = 702,
     FS_WriteBeyondEnd = 705,
     FS_UnsupportedOpenFlags = 760,
+    FS_IncorrectExeFSReadSize = 761,
     FS_UnexpectedFileOrDirectory = 770,
     InvalidSection = 1000,
     TooLarge = 1001,