Atmosphere/stratosphere/boot/source/updater/updater_bis_save.cpp

/*
 * Copyright (c) 2018-2019 Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <switch.h>
#include <stratosphere.hpp>

#include "updater_bis_save.hpp"

size_t BisSave::GetVerificationFlagOffset(BootModeType mode) {
    switch (mode) {
        case BootModeType_Normal:
            return 0;
        case BootModeType_Safe:
            return 1;
        default:
            return 2;
    }
}

Result BisSave::Initialize(void *work_buffer, size_t work_buffer_size) {
    if (work_buffer_size < SaveSize || reinterpret_cast<uintptr_t>(work_buffer) & 0xFFF || work_buffer_size & 0x1FF) {
        std::abort();
    }

    Result rc = this->accessor.Initialize();
    if (R_FAILED(rc)) {
        return rc;
    }
    this->save_buffer = work_buffer;
    return ResultSuccess;
}

void BisSave::Finalize() {
    this->accessor.Finalize();
}

Result BisSave::Load() {
    size_t read_size;
    return this->accessor.Read(&read_size, this->save_buffer, SaveSize, Boot0Partition::BctSave);
}

Result BisSave::Save() {
    return this->accessor.Write(this->save_buffer, SaveSize, Boot0Partition::BctSave);
}

bool BisSave::GetNeedsVerification(BootModeType mode) {
    return reinterpret_cast<const u8 *>(this->save_buffer)[GetVerificationFlagOffset(mode)] != 0;
}

void BisSave::SetNeedsVerification(BootModeType mode, bool needs_verification) {
    reinterpret_cast<u8 *>(this->save_buffer)[GetVerificationFlagOffset(mode)] = needs_verification ? 1 : 0;
}