citra/src/core/file_sys/archive_ncch.cpp

// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <memory>
#include <vector>
#include "common/common_types.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/file_sys/archive_ncch.h"
#include "core/file_sys/ivfc_archive.h"
#include "core/hle/service/fs/archive.h"

////////////////////////////////////////////////////////////////////////////////////////////////////
// FileSys namespace

namespace FileSys {

static std::string GetNCCHContainerPath(const std::string& nand_directory) {
    return Common::StringFromFormat("%s%s/title/", nand_directory.c_str(), SYSTEM_ID);
}

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);
}

ArchiveFactory_NCCH::ArchiveFactory_NCCH(const std::string& nand_directory)
    : mount_point(GetNCCHContainerPath(nand_directory)) {}

ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_NCCH::Open(const Path& path) {
    auto vec = path.AsBinary();
    const u32* data = reinterpret_cast<u32*>(vec.data());
    std::string file_path = GetNCCHPath(mount_point, data[1], data[0]);
    auto file = std::make_shared<FileUtil::IOFile>(file_path, "rb");

    if (!file->IsOpen()) {
        return ResultCode(ErrorDescription::FS_NotFound, ErrorModule::FS, ErrorSummary::NotFound,
                          ErrorLevel::Status);
    }
    auto size = file->GetSize();

    auto archive = std::make_unique<IVFCArchive>(file, 0, size);
    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
}

ResultCode ArchiveFactory_NCCH::Format(const Path& path,
                                       const FileSys::ArchiveFormatInfo& format_info) {
    LOG_ERROR(Service_FS, "Attempted to format a NCCH archive.");
    // TODO: Verify error code
    return ResultCode(ErrorDescription::NotAuthorized, ErrorModule::FS, ErrorSummary::NotSupported,
                      ErrorLevel::Permanent);
}

ResultVal<ArchiveFormatInfo> ArchiveFactory_NCCH::GetFormatInfo(const Path& path) const {
    // TODO(Subv): Implement
    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive %s", GetName().c_str());
    return ResultCode(-1);
}

} // namespace FileSys