From 9907b61c574baf0747747f1c512f7cdd88ebed25 Mon Sep 17 00:00:00 2001
From: KunoiSayami <i@leanhe.dev>
Date: Tue, 9 Nov 2021 22:00:01 +0800
Subject: init

---
 table/block_builder.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 table/block_builder.h

(limited to 'table/block_builder.h')

diff --git a/table/block_builder.h b/table/block_builder.h
new file mode 100644
index 0000000..7a481cd
--- /dev/null
+++ b/table/block_builder.h
@@ -0,0 +1,54 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
+#define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "leveldb/slice.h"
+
+namespace leveldb {
+
+struct Options;
+
+class BlockBuilder {
+ public:
+  explicit BlockBuilder(const Options* options);
+
+  BlockBuilder(const BlockBuilder&) = delete;
+  BlockBuilder& operator=(const BlockBuilder&) = delete;
+
+  // Reset the contents as if the BlockBuilder was just constructed.
+  void Reset();
+
+  // REQUIRES: Finish() has not been called since the last call to Reset().
+  // REQUIRES: key is larger than any previously added key
+  void Add(const Slice& key, const Slice& value);
+
+  // Finish building the block and return a slice that refers to the
+  // block contents.  The returned slice will remain valid for the
+  // lifetime of this builder or until Reset() is called.
+  Slice Finish();
+
+  // Returns an estimate of the current (uncompressed) size of the block
+  // we are building.
+  size_t CurrentSizeEstimate() const;
+
+  // Return true iff no entries have been added since the last Reset()
+  bool empty() const { return buffer_.empty(); }
+
+ private:
+  const Options* options_;
+  std::string buffer_;              // Destination buffer
+  std::vector<uint32_t> restarts_;  // Restart points
+  int counter_;                     // Number of entries emitted since restart
+  bool finished_;                   // Has Finish() been called?
+  std::string last_key_;
+};
+
+}  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
-- 
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