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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/utilities/cassandra/serialize.h | |
parent | Initial commit. (diff) | |
download | ceph-upstream/18.2.2.tar.xz ceph-upstream/18.2.2.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/utilities/cassandra/serialize.h')
-rw-r--r-- | src/rocksdb/utilities/cassandra/serialize.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/cassandra/serialize.h b/src/rocksdb/utilities/cassandra/serialize.h new file mode 100644 index 000000000..4bd552bfc --- /dev/null +++ b/src/rocksdb/utilities/cassandra/serialize.h @@ -0,0 +1,81 @@ +// Copyright (c) 2017-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +/** + * Helper functions which serialize and deserialize integers + * into bytes in big endian. + */ + +#pragma once + +#include <cstdint> +#include <string> + +#include "rocksdb/rocksdb_namespace.h" + +namespace ROCKSDB_NAMESPACE { +namespace cassandra { +namespace { +const int64_t kCharMask = 0xFFLL; +const int32_t kBitsPerByte = 8; +} // namespace + +template <typename T> +void Serialize(T val, std::string* dest); + +template <typename T> +T Deserialize(const char* src, std::size_t offset = 0); + +// Specializations +template <> +inline void Serialize<int8_t>(int8_t t, std::string* dest) { + dest->append(1, static_cast<char>(t & kCharMask)); +} + +template <> +inline void Serialize<int32_t>(int32_t t, std::string* dest) { + for (unsigned long i = 0; i < sizeof(int32_t); i++) { + dest->append( + 1, static_cast<char>((t >> (sizeof(int32_t) - 1 - i) * kBitsPerByte) & + kCharMask)); + } +} + +template <> +inline void Serialize<int64_t>(int64_t t, std::string* dest) { + for (unsigned long i = 0; i < sizeof(int64_t); i++) { + dest->append( + 1, static_cast<char>((t >> (sizeof(int64_t) - 1 - i) * kBitsPerByte) & + kCharMask)); + } +} + +template <> +inline int8_t Deserialize<int8_t>(const char* src, std::size_t offset) { + return static_cast<int8_t>(src[offset]); +} + +template <> +inline int32_t Deserialize<int32_t>(const char* src, std::size_t offset) { + int32_t result = 0; + for (unsigned long i = 0; i < sizeof(int32_t); i++) { + result |= static_cast<int32_t>(static_cast<unsigned char>(src[offset + i])) + << ((sizeof(int32_t) - 1 - i) * kBitsPerByte); + } + return result; +} + +template <> +inline int64_t Deserialize<int64_t>(const char* src, std::size_t offset) { + int64_t result = 0; + for (unsigned long i = 0; i < sizeof(int64_t); i++) { + result |= static_cast<int64_t>(static_cast<unsigned char>(src[offset + i])) + << ((sizeof(int64_t) - 1 - i) * kBitsPerByte); + } + return result; +} + +} // namespace cassandra +} // namespace ROCKSDB_NAMESPACE |