Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 40 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..3c7baacce
--- /dev/null
+++ b/src/rocksdb/utilities/merge_operators/bytesxor.h
@@ -0,0 +1,40 @@
+//  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;
+
+  static const char* kClassName() { return "BytesXOR"; }
+  static const char* kNickName() { return "bytesxor"; }
+
+  const char* NickName() const override { return kNickName(); }
+  const char* Name() const override { return kClassName(); }
+
+  void XOR(const Slice* existing_value, const Slice& value,
+           std::string* new_value) const;
+};
+
+}  // namespace ROCKSDB_NAMESPACE