text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_TXDB_H
  #define BITCOIN_TXDB_H
  
  #include "coins.h"
  #include "leveldbwrapper.h"
  
  #include <map>
  #include <string>
  #include <utility>
  #include <vector>
  
  class CBlockFileInfo;
  class CBlockIndex;
  struct CDiskTxPos;
  struct CAddressUnspentKey;
  struct CAddressUnspentValue;
  struct CAddressIndexKey;
  struct CAddressIndexIteratorKey;
  struct CAddressIndexIteratorHeightKey;
  struct CTimestampIndexKey;
  struct CTimestampIndexIteratorKey;
  struct CTimestampBlockIndexKey;
  struct CTimestampBlockIndexValue;
  struct CSpentIndexKey;
  struct CSpentIndexValue;
  class uint256;
  
  //! -dbcache default (MiB)
  static const int64_t nDefaultDbCache = 100;
  //! max. -dbcache in (MiB)
  static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
  //! min. -dbcache in (MiB)
  static const int64_t nMinDbCache = 4;
  
  /** CCoinsView backed by the LevelDB coin database (chainstate/) */
  class CCoinsViewDB : public CCoinsView
  {
  protected:
      CLevelDBWrapper db;
  public:
      CCoinsViewDB(size_t nCacheSize, bool &isObfuscated, bool fMemory = false, bool fWipe = false);
  
      bool GetCoins(const uint256 &txid, CCoins &coins) const;
      bool HaveCoins(const uint256 &txid) const;
      uint256 GetBestBlock() const;
      bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
      bool GetStats(CCoinsStats &stats) const;
  };
  
  /** Access to the block database (blocks/index/) */
  class CBlockTreeDB : public CLevelDBWrapper
  {
  public:
      CBlockTreeDB(size_t nCacheSize, bool &isObfuscated, bool fMemory = false, bool fWipe = false, bool compression = true, int maxOpenFiles = 1000);
  private:
      CBlockTreeDB(const CBlockTreeDB&);
      void operator=(const CBlockTreeDB&);
  public:
      bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
      bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
      bool ReadLastBlockFile(int &nFile);
      bool WriteReindexing(bool fReindex);
      bool ReadReindexing(bool &fReindex);
      bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
      bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
      bool ReadSpentIndex(CSpentIndexKey &key, CSpentIndexValue &value);
      bool UpdateSpentIndex(const std::vector<std::pair<CSpentIndexKey, CSpentIndexValue> >&vect);
      bool UpdateAddressUnspentIndex(const std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue > >&vect);
      bool ReadAddressUnspentIndex(uint160 addressHash, int type,
                                   std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue> > &vect);
      bool WriteAddressIndex(const std::vector<std::pair<CAddressIndexKey, CAmount> > &vect);
      bool EraseAddressIndex(const std::vector<std::pair<CAddressIndexKey, CAmount> > &vect);
      bool ReadAddressIndex(uint160 addressHash, int type,
                            std::vector<std::pair<CAddressIndexKey, CAmount> > &addressIndex,
                            int start = 0, int end = 0);
      bool WriteTimestampIndex(const CTimestampIndexKey &timestampIndex);
      bool ReadTimestampIndex(const unsigned int &high, const unsigned int &low, const bool fActiveOnly, std::vector<std::pair<uint256, unsigned int> > &vect);
      bool WriteTimestampBlockIndex(const CTimestampBlockIndexKey &blockhashIndex, const CTimestampBlockIndexValue &logicalts);
      bool ReadTimestampBlockIndex(const uint256 &hash, unsigned int &logicalTS);
      bool WriteFlag(const std::string &name, bool fValue);
      bool ReadFlag(const std::string &name, bool &fValue);
      bool LoadBlockIndexGuts();
      bool blockOnchainActive(const uint256 &hash);
  };
  
  #endif // BITCOIN_TXDB_H
  