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-rw-r--r-- | src/rocksdb/utilities/merge_operators/bytesxor.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/merge_operators/bytesxor.h b/src/rocksdb/utilities/merge_operators/bytesxor.h new file mode 100644 index 000000000..ab0c5aecc --- /dev/null +++ b/src/rocksdb/utilities/merge_operators/bytesxor.h @@ -0,0 +1,39 @@ +// 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). + +#pragma once + +#include <algorithm> +#include <memory> +#include <string> +#include "rocksdb/env.h" +#include "rocksdb/merge_operator.h" +#include "rocksdb/slice.h" +#include "util/coding.h" +#include "utilities/merge_operators.h" + +namespace ROCKSDB_NAMESPACE { + +// A 'model' merge operator that XORs two (same sized) array of bytes. +// Implemented as an AssociativeMergeOperator for simplicity and example. +class BytesXOROperator : public AssociativeMergeOperator { + public: + // XORs the two array of bytes one byte at a time and stores the result + // in new_value. len is the number of xored bytes, and the length of new_value + virtual bool Merge(const Slice& key, + const Slice* existing_value, + const Slice& value, + std::string* new_value, + Logger* logger) const override; + + virtual const char* Name() const override { + return "BytesXOR"; + } + + void XOR(const Slice* existing_value, const Slice& value, + std::string* new_value) const; +}; + +} // namespace ROCKSDB_NAMESPACE |