mirror of
https://github.com/Tencent/MMKV.git
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guoling
73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
/*
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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 CHECKSUM_H
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#define CHECKSUM_H
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#ifdef __cplusplus
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#include "../MMKVPredef.h"
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#if MMKV_EMBED_ZLIB
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# include "zlib/zconf.h"
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namespace zlib {
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uLong crc32(uLong crc, const Bytef *buf, z_size_t len);
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} // namespace zlib
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# define ZLIB_CRC32(crc, buf, len) zlib::crc32(crc, buf, len)
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#else // MMKV_EMBED_ZLIB
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# include <zlib.h>
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# define ZLIB_CRC32(crc, buf, len) ::crc32(crc, buf, static_cast<uInt>(len))
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#endif // MMKV_EMBED_ZLIB
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#if defined(__aarch64__) && defined(__linux__)
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# define MMKV_USE_ARMV8_CRC32
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namespace mmkv {
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uint32_t armv8_crc32(uint32_t crc, const uint8_t *buf, size_t len);
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}
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# ifdef MMKV_OHOS
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// getauxval(AT_HWCAP) in OHOS returns wrong value, we just assume all OHOS device have crc32 instr
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# define CRC32 mmkv::armv8_crc32
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# else
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// have to check CPU's instruction set dynamically
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typedef uint32_t (*CRC32_Func_t)(uint32_t crc, const uint8_t *buf, size_t len);
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extern CRC32_Func_t CRC32;
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# endif
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#else // defined(__aarch64__) && defined(__linux__)
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# define CRC32(crc, buf, len) ZLIB_CRC32(crc, buf, len)
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#endif // defined(__aarch64__) && defined(__linux__)
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#endif // __cplusplus
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#endif // CHECKSUM_H
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