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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/merge_operators/bytesxor.cc | |
parent | Initial commit. (diff) | |
download | ceph-b26c4052f3542036551aa9dec9caa4226e456195.tar.xz ceph-b26c4052f3542036551aa9dec9caa4226e456195.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/utilities/merge_operators/bytesxor.cc | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/merge_operators/bytesxor.cc b/src/rocksdb/utilities/merge_operators/bytesxor.cc new file mode 100644 index 000000000..fa09c18ea --- /dev/null +++ b/src/rocksdb/utilities/merge_operators/bytesxor.cc @@ -0,0 +1,57 @@ +// Copyright (c) 2011-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). + +#include "utilities/merge_operators/bytesxor.h" + +#include <algorithm> +#include <string> + +namespace ROCKSDB_NAMESPACE { + +std::shared_ptr<MergeOperator> MergeOperators::CreateBytesXOROperator() { + return std::make_shared<BytesXOROperator>(); +} + +bool BytesXOROperator::Merge(const Slice& /*key*/, const Slice* existing_value, + const Slice& value, std::string* new_value, + Logger* /*logger*/) const { + XOR(existing_value, value, new_value); + return true; +} + +void BytesXOROperator::XOR(const Slice* existing_value, const Slice& value, + std::string* new_value) const { + if (!existing_value) { + new_value->clear(); + new_value->assign(value.data(), value.size()); + return; + } + + size_t min_size = std::min(existing_value->size(), value.size()); + size_t max_size = std::max(existing_value->size(), value.size()); + + new_value->clear(); + new_value->reserve(max_size); + + const char* existing_value_data = existing_value->data(); + const char* value_data = value.data(); + + for (size_t i = 0; i < min_size; i++) { + new_value->push_back(existing_value_data[i] ^ value_data[i]); + } + + if (existing_value->size() == max_size) { + for (size_t i = min_size; i < max_size; i++) { + new_value->push_back(existing_value_data[i]); + } + } else { + assert(value.size() == max_size); + for (size_t i = min_size; i < max_size; i++) { + new_value->push_back(value_data[i]); + } + } +} + +} // namespace ROCKSDB_NAMESPACE |