/**
 * Copyright (c) 2011-2022 Bill Greiman
 * This file is part of the SdFat library for SD memory cards.
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
#define DBG_FILE "FsCache.cpp"
#include "FsCache.h"

#include "DebugMacros.h"
//------------------------------------------------------------------------------
uint8_t *FsCache::prepare(uint32_t sector, uint8_t option)
{
    if (!m_blockDev)
    {
        DBG_FAIL_MACRO;
        goto fail;
    }
    if (m_sector != sector)
    {
        if (!sync())
        {
            DBG_FAIL_MACRO;
            goto fail;
        }
        if (!(option & CACHE_OPTION_NO_READ))
        {
            if (!m_blockDev->readSector(sector, m_buffer))
            {
                DBG_FAIL_MACRO;
                goto fail;
            }
        }
        m_status = 0;
        m_sector = sector;
    }
    m_status |= option & CACHE_STATUS_MASK;
    return m_buffer;

fail:
    return nullptr;
}
//------------------------------------------------------------------------------
bool FsCache::sync()
{
    if (m_status & CACHE_STATUS_DIRTY)
    {
        if (!m_blockDev->writeSector(m_sector, m_buffer))
        {
            DBG_FAIL_MACRO;
            goto fail;
        }
        // mirror second FAT
        if (m_status & CACHE_STATUS_MIRROR_FAT)
        {
            if (!m_blockDev->writeSector(m_sector + m_mirrorOffset, m_buffer))
            {
                DBG_FAIL_MACRO;
                goto fail;
            }
        }
        m_status &= ~CACHE_STATUS_DIRTY;
    }
    return true;

fail:
    return false;
}
