DiskStorage/src/include/Storage/Disk/Buffer.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * Buffer.h
 *
 ****/
#pragma once

#include <Storage/Device.h>
#include <map>

namespace Storage::Disk
{
struct Buffer : public std::unique_ptr<uint8_t[]> {
    static constexpr uint32_t invalid{uint32_t(-1)};
    uint32_t sector{invalid};
    bool dirty{false};

    void invalidate()
    {
        sector = invalid;
        dirty = false;
    }
};

class BufferList
{
public:
    BufferList(uint16_t sectorSize, size_t count) : mSize(1 << getSizeBits(count))
    {
        list.reset(new Buffer[mSize]);
        if(!list) {
            mSize = 0;
        }
        for(unsigned i = 0; i < mSize; ++i) {
            list[i].reset(new uint8_t[sectorSize]);
        }
    }

    Buffer& get(storage_size_t sector)
    {
        return list[sector & (mSize - 1)];
    }

    Buffer* begin() const
    {
        return &list[0];
    }

    Buffer* end() const
    {
        return &list[mSize];
    }

    size_t size() const
    {
        return mSize;
    }

private:
    std::unique_ptr<Buffer[]> list;
    size_t mSize;
};

} // namespace Storage::Disk