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// 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 <cstdint>
#include "rocksdb/rocksdb_namespace.h"
namespace ROCKSDB_NAMESPACE {
namespace log {
enum RecordType : uint8_t {
// 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,
// For all the values >= 10, the 1 bit indicates whether it's recyclable
// User-defined timestamp sizes
kUserDefinedTimestampSizeType = 10,
kRecyclableUserDefinedTimestampSizeType = 11,
// For WAL verification
kPredecessorWALInfoType = 130,
kRecyclePredecessorWALInfoType = 131,
};
// Unknown type of value with the 8-th bit set will be ignored
constexpr uint8_t kRecordTypeSafeIgnoreMask = 1 << 7;
constexpr uint8_t kMaxRecordType = kRecyclePredecessorWALInfoType;
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