src/leveldb/db/log_format.h

   1 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file. See the AUTHORS file for names of contributors.
   4 //
   5 // Log format information shared by reader and writer.
   6 // See ../doc/log_format.md for more detail.
   7
   8 #ifndef STORAGE_LEVELDB_DB_LOG_FORMAT_H_
   9 #define STORAGE_LEVELDB_DB_LOG_FORMAT_H_
  10
  11 namespace leveldb {
  12 namespace log {
  13
  14 enum RecordType {
  15   // Zero is reserved for preallocated files
  16   kZeroType = 0,
  17
  18   kFullType = 1,
  19
  20   // For fragments
  21   kFirstType = 2,
  22   kMiddleType = 3,
  23   kLastType = 4
  24 };
  25 static const int kMaxRecordType = kLastType;
  26
  27 static const int kBlockSize = 32768;
  28
  29 // Header is checksum (4 bytes), length (2 bytes), type (1 byte).
  30 static const int kHeaderSize = 4 + 2 + 1;
  31
  32 }  // namespace log
  33 }  // namespace leveldb
  34
  35 #endif  // STORAGE_LEVELDB_DB_LOG_FORMAT_H_