82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
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/*
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* Tencent is pleased to support the open source community by making
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* MMKV available.
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*
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* Copyright (C) 2018 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use
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* this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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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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*/
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#ifndef MMKV_MMKVMETAINFO_H
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#define MMKV_MMKVMETAINFO_H
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#ifdef __cplusplus
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#include "aes/AESCrypt.h"
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#include <cstdint>
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#include <cstring>
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namespace mmkv {
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enum MMKVVersion : uint32_t {
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MMKVVersionDefault = 0,
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// record full write back count
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MMKVVersionSequence = 1,
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// store random iv for encryption
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MMKVVersionRandomIV = 2,
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// store actual size together with crc checksum, try to reduce file corruption
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MMKVVersionActualSize = 3,
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};
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struct MMKVMetaInfo {
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uint32_t m_crcDigest = 0;
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uint32_t m_version = MMKVVersionSequence;
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uint32_t m_sequence = 0; // full write-back count
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uint8_t m_vector[AES_KEY_LEN] = {};
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uint32_t m_actualSize = 0;
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// confirmed info: it's been synced to file
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struct {
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uint32_t lastActualSize = 0;
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uint32_t lastCRCDigest = 0;
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uint32_t _reserved[16] = {};
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} m_lastConfirmedMetaInfo;
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void write(void *ptr) const {
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MMKV_ASSERT(ptr);
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memcpy(ptr, this, sizeof(MMKVMetaInfo));
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}
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void writeCRCAndActualSizeOnly(void *ptr) const {
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MMKV_ASSERT(ptr);
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auto other = (MMKVMetaInfo *) ptr;
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other->m_crcDigest = m_crcDigest;
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other->m_actualSize = m_actualSize;
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}
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void read(const void *ptr) {
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MMKV_ASSERT(ptr);
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memcpy(this, ptr, sizeof(MMKVMetaInfo));
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}
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};
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static_assert(sizeof(MMKVMetaInfo) <= (4 * 1024), "MMKVMetaInfo lager than one pagesize");
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} // namespace mmkv
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#endif
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#endif //MMKV_MMKVMETAINFO_H
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