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RocksDB for Erlang

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rocksdb deps rocksdb db log_format.h
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deps/rocksdb/db/log_format.h 

//  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).

//

// 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.

//

// Log format information shared by reader and writer.

// See ../doc/log_format.txt for more detail.



#pragma once



#include "rocksdb/rocksdb_namespace.h"



namespace ROCKSDB_NAMESPACE {

namespace log {



enum RecordType {

  // Zero is reserved for preallocated files

  kZeroType = 0,

  kFullType = 1,



  // For fragments

  kFirstType = 2,

  kMiddleType = 3,

  kLastType = 4,



  // For recycled log files

  kRecyclableFullType = 5,

  kRecyclableFirstType = 6,

  kRecyclableMiddleType = 7,

  kRecyclableLastType = 8,



  // Compression Type

  kSetCompressionType = 9,



  // User-defined timestamp sizes

  kUserDefinedTimestampSizeType = 10,

  kRecyclableUserDefinedTimestampSizeType = 11,

};

constexpr int kMaxRecordType = kRecyclableUserDefinedTimestampSizeType;



constexpr unsigned int kBlockSize = 32768;



// Header is checksum (4 bytes), length (2 bytes), type (1 byte)

constexpr int kHeaderSize = 4 + 2 + 1;



// Recyclable header is checksum (4 bytes), length (2 bytes), type (1 byte),

// log number (4 bytes).

constexpr int kRecyclableHeaderSize = 4 + 2 + 1 + 4;



}  // namespace log

}  // namespace ROCKSDB_NAMESPACE