5a27a63541
This change removes the earlier limitation of 1984 bytes for storing data-blobs. Blobs larger than the sector size are split and stored on multiple sectors. For this purpose, two new datatypes (multi-page index and multi-page data) are added for entries stored in the sectors. The underlying read, write, erase and find operations are modified to support these large blobs. The change is transparent to users of the library and no special APIs need to be used to store these large blobs.
76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef nvs_pagemanager_hpp
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#define nvs_pagemanager_hpp
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#include <memory>
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#include <list>
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#include "nvs_types.hpp"
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#include "nvs_page.hpp"
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#include "nvs_pagemanager.hpp"
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#include "intrusive_list.h"
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namespace nvs
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{
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class PageManager
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{
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using TPageList = intrusive_list<Page>;
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using TPageListIterator = TPageList::iterator;
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public:
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PageManager() {}
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esp_err_t load(uint32_t baseSector, uint32_t sectorCount);
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TPageListIterator begin()
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{
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return mPageList.begin();
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}
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TPageListIterator end()
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{
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return mPageList.end();
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}
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Page& back()
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{
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return mPageList.back();
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}
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uint32_t getPageCount() {
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return mPageCount;
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}
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esp_err_t requestNewPage();
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esp_err_t fillStats(nvs_stats_t& nvsStats);
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protected:
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friend class Iterator;
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esp_err_t activatePage();
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TPageList mPageList;
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TPageList mFreePageList;
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std::unique_ptr<Page[]> mPages;
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uint32_t mBaseSector;
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uint32_t mPageCount;
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uint32_t mSeqNumber;
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}; // class PageManager
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} // namespace nvs
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#endif /* nvs_pagemanager_hpp */
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