text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef BITCOIN_WALLET_H
  #define BITCOIN_WALLET_H
  
  #include <string>
  #include <vector>
  
  #include <stdlib.h>
  
  #include "main.h"
  #include "key.h"
  #include "keystore.h"
  #include "script.h"
  #include "interface.h"
  #include "util.h"
  #include "walletdb.h"
  #include "base58.h"
  
  extern unsigned int nStakeMaxAge;
  extern bool fWalletUnlockMintOnly;
  extern bool fConfChange;
  class CAccountingEntry;
  class CWalletTx;
  class CReserveKey;
  class COutput;
  class CCoinControl;
  
  // Set of selected transactions
  typedef std::set<std::pair<const CWalletTx*,unsigned int> > CoinsSet;
  
  /** (client) version numbers for particular wallet features */
  enum WalletFeature
  {
      FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getinfo's clientversion output)
  
      FEATURE_WALLETCRYPT = 40000, // wallet encryption
      FEATURE_COMPRPUBKEY = 60000, // compressed public keys
      FEATURE_MALLKEY = 60017,
      FEATURE_LATEST = 60017
  };
  
  /** A key pool entry */
  class CKeyPool
  {
  public:
      int64_t nTime;
      CPubKey vchPubKey;
  
      CKeyPool()
      {
          nTime = GetTime();
      }
  
      CKeyPool(const CPubKey& vchPubKeyIn)
      {
          nTime = GetTime();
          vchPubKey = vchPubKeyIn;
      }
  
      IMPLEMENT_SERIALIZE
      (
          if (!(nType & SER_GETHASH))
              READWRITE(nVersion);
          READWRITE(nTime);
          READWRITE(vchPubKey);
      )
  };
  
  /** A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
   * and provides the ability to create new transactions.
   */
  class CWallet : public CCryptoKeyStore
  {
  private:
      bool SelectCoins(int64_t nTargetValue, unsigned int nSpendTime, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet, const CCoinControl *coinControl=NULL) const;
  
      CWalletDB *pwalletdbEncryption, *pwalletdbDecryption;
  
      // the current wallet version: clients below this version are not able to load the wallet
      int nWalletVersion;
  
      // the maximum wallet format version: memory-only variable that specifies to what version this wallet may be upgraded
      int nWalletMaxVersion;
  
      int64_t nNextResend;
      int64_t nLastResend;
  
      // stake mining statistics
      uint64_t nKernelsTried;
      uint64_t nCoinDaysTried;
  
  public:
      mutable CCriticalSection cs_wallet;
  
      bool fFileBacked;
      std::string strWalletFile;
  
      std::set<int64_t> setKeyPool;
      /*
      std::map<CKeyID, CKeyMetadata> mapKeyMetadata;
      std::map<CMalleableKeyView, CKeyMetadata> mapMalleableKeyMetadata;
      */
  
      std::map<CBitcoinAddress, CKeyMetadata> mapKeyMetadata;
  
      typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
      MasterKeyMap mapMasterKeys;
      unsigned int nMasterKeyMaxID;
  
      CWallet()
      {
          SetNull();
      }
      CWallet(std::string strWalletFileIn)
      {
          SetNull();
  
          strWalletFile = strWalletFileIn;
          fFileBacked = true;
      }
      void SetNull()
      {
          nWalletVersion = FEATURE_BASE;
          nWalletMaxVersion = FEATURE_BASE;
          fFileBacked = false;
          nMasterKeyMaxID = 0;
          pwalletdbEncryption = NULL;
          pwalletdbDecryption = NULL;
          nNextResend = 0;
          nLastResend = 0;
          nOrderPosNext = 0;
          nKernelsTried = 0;
          nCoinDaysTried = 0;
          nTimeFirstKey = 0;
      }
  
      std::map<uint256, CWalletTx> mapWallet;
      std::vector<uint256> vMintingWalletUpdated;
      int64_t nOrderPosNext;
      std::map<uint256, int> mapRequestCount;
  
      std::map<CBitcoinAddress, std::string> mapAddressBook;
  
      CPubKey vchDefaultKey;
      int64_t nTimeFirstKey;
  
      const CWalletTx* GetWalletTx(const uint256& hash) const;
  
      // check whether we are allowed to upgrade (or already support) to the named feature
      bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }
  
      void AvailableCoinsMinConf(std::vector<COutput>& vCoins, int nConf, int64_t nMinValue, int64_t nMaxValue) const;
      void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true, const CCoinControl *coinControl=NULL) const;
      bool SelectCoinsMinConf(int64_t nTargetValue, unsigned int nSpendTime, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const;
  
      // Simple select (without randomization)
      bool SelectCoinsSimple(int64_t nTargetValue, int64_t nMinValue, int64_t nMaxValue, unsigned int nSpendTime, int nMinConf, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const;
  
      // keystore implementation
      // Generate a new key
      CPubKey GenerateNewKey();
      CMalleableKeyView GenerateNewMalleableKey();
      // Adds a key to the store, and saves it to disk.
      bool AddKey(const CKey& key);
      bool AddKey(const CMalleableKey& mKey);
      // Adds a key to the store, without saving it to disk (used by LoadWallet)
      bool LoadKey(const CKey& key) { return CCryptoKeyStore::AddKey(key); }
      // Load metadata (used by LoadWallet)
      bool LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &metadata);
      bool LoadKeyMetadata(const CMalleableKeyView &keyView, const CKeyMetadata &metadata);
  
      // Load malleable key without saving it to disk (used by LoadWallet)
      bool LoadKey(const CMalleableKeyView &keyView, const CSecret &vchSecretH) { return CCryptoKeyStore::AddMalleableKey(keyView, vchSecretH); }
      bool LoadCryptedKey(const CMalleableKeyView &keyView, const std::vector<unsigned char> &vchCryptedSecretH) { return CCryptoKeyStore::AddCryptedMalleableKey(keyView, vchCryptedSecretH); }
  
      bool LoadMinVersion(int nVersion) { nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
  
      // Adds an encrypted key to the store, and saves it to disk.
      bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
      bool AddCryptedMalleableKey(const CMalleableKeyView& keyView, const std::vector<unsigned char> &vchCryptedSecretH);
      // Adds an encrypted key to the store, without saving it to disk (used by LoadWallet)
      bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret) { SetMinVersion(FEATURE_WALLETCRYPT); return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret); }
      bool AddCScript(const CScript& redeemScript);
      bool LoadCScript(const CScript& redeemScript);
  
      // Adds a watch-only address to the store, and saves it to disk.
      bool AddWatchOnly(const CScript &dest);
      bool RemoveWatchOnly(const CScript &dest);
      // Adds a watch-only address to the store, without saving it to disk (used by LoadWallet)
      bool LoadWatchOnly(const CScript &dest);
  
      bool Unlock(const SecureString& strWalletPassphrase);
      bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
      bool EncryptWallet(const SecureString& strWalletPassphrase);
      bool DecryptWallet(const SecureString& strWalletPassphrase);
  
      void GetAddresses(std::map<CBitcoinAddress, int64_t> &mapAddresses) const;
  
  
      /** Increment the next transaction order id
          @return next transaction order id
       */
      int64_t IncOrderPosNext(CWalletDB *pwalletdb = NULL);
  
      typedef std::pair<CWalletTx*, CAccountingEntry*> TxPair;
      typedef std::multimap<int64_t, TxPair > TxItems;
  
      /** Get the wallet's activity log
          @return multimap of ordered transactions and accounting entries
          @warning Returned pointers are *only* valid within the scope of passed acentries
       */
      TxItems OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount = "");
  
      void MarkDirty();
      bool AddToWallet(const CWalletTx& wtxIn);
      bool AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate = false);
      bool EraseFromWallet(uint256 hash);
      void ClearOrphans();
      void WalletUpdateSpent(const CTransaction& prevout, bool fBlock = false);
      int ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
      int ScanForWalletTransaction(const uint256& hashTx);
      void ReacceptWalletTransactions();
      void ResendWalletTransactions(int64_t nBestBlockTime);
      std::vector<uint256> ResendWalletTransactionsBefore(int64_t nTime);
      int64_t GetBalance() const;
      int64_t GetWatchOnlyBalance() const;
      int64_t GetUnconfirmedBalance() const;
      int64_t GetUnconfirmedWatchOnlyBalance() const;
      int64_t GetImmatureBalance() const;
      int64_t GetImmatureWatchOnlyBalance() const;
      int64_t GetStake() const;
      int64_t GetNewMint() const;
      int64_t GetWatchOnlyStake() const;
      int64_t GetWatchOnlyNewMint() const;
      bool CreateTransaction(const std::vector<std::pair<CScript, int64_t> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl *coinControl=NULL);
      bool CreateTransaction(CScript scriptPubKey, int64_t nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl *coinControl=NULL);
      bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
  
      void GetStakeWeightFromValue(const int64_t& nTime, const int64_t& nValue, uint64_t& nWeight);
      bool CreateCoinStake(uint256 &hashTx, uint32_t nOut, uint32_t nTime, uint32_t nBits, CTransaction &txNew, CKey& key);
      bool MergeCoins(const int64_t& nAmount, const int64_t& nMinValue, const int64_t& nMaxValue, std::list<uint256>& listMerged);
  
      std::string SendMoney(CScript scriptPubKey, int64_t nValue, CWalletTx& wtxNew, bool fAskFee=false);
  
      bool NewKeyPool(unsigned int nSize = 0);
      bool TopUpKeyPool(unsigned int nSize = 0);
      int64_t AddReserveKey(const CKeyPool& keypool);
      void ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool);
      void KeepKey(int64_t nIndex);
      void ReturnKey(int64_t nIndex);
      bool GetKeyFromPool(CPubKey &key, bool fAllowReuse=true);
      int64_t GetOldestKeyPoolTime();
      void GetAllReserveKeys(std::set<CKeyID>& setAddress) const;
  
      std::set< std::set<CBitcoinAddress> > GetAddressGroupings();
      std::map<CBitcoinAddress, int64_t> GetAddressBalances();
  
      isminetype IsMine(const CTxIn& txin) const;
      int64_t GetDebit(const CTxIn& txin, const isminefilter& filter) const;
      isminetype IsMine(const CTxOut& txout) const;
      int64_t GetCredit(const CTxOut& txout, const isminefilter& filter) const;
      bool IsChange(const CTxOut& txout) const;
      int64_t GetChange(const CTxOut& txout) const;
      bool IsMine(const CTransaction& tx) const;
      bool IsFromMe(const CTransaction& tx) const;
      int64_t GetDebit(const CTransaction& tx, const isminefilter& filter) const;
      int64_t GetCredit(const CTransaction& tx, const isminefilter& filter) const;
      int64_t GetChange(const CTransaction& tx) const;
      void SetBestChain(const CBlockLocator& loc);
  
      DBErrors LoadWallet(bool& fFirstRunRet);
      DBErrors ZapWalletTx();
  
      bool SetAddressBookName(const CTxDestination& address, const std::string& strName);
      bool SetAddressBookName(const CBitcoinAddress& address, const std::string& strName);
      bool DelAddressBookName(const CBitcoinAddress& address);
      void UpdatedTransaction(const uint256 &hashTx);
      void PrintWallet(const CBlock& block);
  
      void Inventory(const uint256 &hash)
      {
          {
              LOCK(cs_wallet);
              std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
              if (mi != mapRequestCount.end())
                  (*mi).second++;
          }
      }
  
      unsigned int GetKeyPoolSize()
      {
          return (unsigned int)(setKeyPool.size());
      }
  
      bool GetTransaction(const uint256 &hashTx, CWalletTx& wtx);
      bool SetDefaultKey(const CPubKey &vchPubKey);
  
      // signify that a particular wallet feature is now used. this may change nWalletVersion and nWalletMaxVersion if those are lower
      bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = NULL, bool fExplicit = false);
  
      // change which version we're allowed to upgrade to (note that this does not immediately imply upgrading to that format)
      bool SetMaxVersion(int nVersion);
  
      // get the current wallet format (the oldest client version guaranteed to understand this wallet)
      int GetVersion() { return nWalletVersion; }
  
      void FixSpentCoins(int& nMismatchSpent, int64_t& nBalanceInQuestion, bool fCheckOnly = false);
      void DisableTransaction(const CTransaction &tx);
  
      /** Address book entry changed.
       * @note called with lock cs_wallet held.
       */
      boost::signals2::signal<void (CWallet *wallet, const CBitcoinAddress &address, const std::string &label, bool isMine, ChangeType status)> NotifyAddressBookChanged;
  
      /** Wallet transaction added, removed or updated.
       * @note called with lock cs_wallet held.
       */
      boost::signals2::signal<void (CWallet *wallet, const uint256 &hashTx, ChangeType status)> NotifyTransactionChanged;
  
      /** Watch-only address added */
      boost::signals2::signal<void (bool fHaveWatchOnly)> NotifyWatchonlyChanged;
  };
  
  /** A key allocated from the key pool. */
  class CReserveKey
  {
  protected:
      CWallet* pwallet;
      int64_t nIndex;
      CPubKey vchPubKey;
  public:
      CReserveKey(CWallet* pwalletIn)
      {
          nIndex = -1;
          pwallet = pwalletIn;
      }
  
      ~CReserveKey()
      {
          if (!fShutdown)
              ReturnKey();
      }
  
      void ReturnKey();
      CPubKey GetReservedKey();
      void KeepKey();
  };
  
  
  typedef std::map<std::string, std::string> mapValue_t;
  
  
  static void ReadOrderPos(int64_t& nOrderPos, mapValue_t& mapValue)
  {
      if (!mapValue.count("n"))
      {
          nOrderPos = -1; // TODO: calculate elsewhere
          return;
      }
      nOrderPos = atoi64(mapValue["n"].c_str());
  }
  
  
  static void WriteOrderPos(const int64_t& nOrderPos, mapValue_t& mapValue)
  {
      if (nOrderPos == -1)
          return;
      mapValue["n"] = i64tostr(nOrderPos);
  }
  
  
  /** A transaction with a bunch of additional info that only the owner cares about.
   * It includes any unrecorded transactions needed to link it back to the block chain.
   */
  class CWalletTx : public CMerkleTx
  {
  private:
      const CWallet* pwallet;
  
  public:
      std::vector<CMerkleTx> vtxPrev;
      mapValue_t mapValue;
      std::vector<std::pair<std::string, std::string> > vOrderForm;
      unsigned int fTimeReceivedIsTxTime;
      unsigned int nTimeReceived;  // time received by this node
      unsigned int nTimeSmart;
      char fFromMe;
      std::string strFromAccount;
      std::vector<char> vfSpent; // which outputs are already spent
      int64_t nOrderPos;  // position in ordered transaction list
  
      // memory only
      mutable bool fDebitCached;
      mutable bool fWatchDebitCached;
      mutable bool fCreditCached;
      mutable bool fWatchCreditCached;
      mutable bool fAvailableCreditCached;
      mutable bool fImmatureCreditCached;
      mutable bool fImmatureWatchCreditCached;
      mutable bool fAvailableWatchCreditCached;
      mutable bool fChangeCached;
      mutable int64_t nDebitCached;
      mutable int64_t nWatchDebitCached;
      mutable int64_t nCreditCached;
      mutable int64_t nWatchCreditCached;
      mutable int64_t nAvailableCreditCached;
      mutable int64_t nImmatureCreditCached;
      mutable int64_t nImmatureWatchCreditCached;
      mutable int64_t nAvailableWatchCreditCached;
      mutable int64_t nChangeCached;
  
      CWalletTx()
      {
          Init(NULL);
      }
  
      CWalletTx(const CWallet* pwalletIn)
      {
          Init(pwalletIn);
      }
  
      CWalletTx(const CWallet* pwalletIn, const CMerkleTx& txIn) : CMerkleTx(txIn)
      {
          Init(pwalletIn);
      }
  
      CWalletTx(const CWallet* pwalletIn, const CTransaction& txIn) : CMerkleTx(txIn)
      {
          Init(pwalletIn);
      }
  
      void Init(const CWallet* pwalletIn)
      {
          pwallet = pwalletIn;
          vtxPrev.clear();
          mapValue.clear();
          vOrderForm.clear();
          fTimeReceivedIsTxTime = false;
          nTimeReceived = 0;
          nTimeSmart = 0;
          fFromMe = false;
          strFromAccount.clear();
          vfSpent.clear();
          fDebitCached = false;
          fWatchDebitCached = false;
          fCreditCached = false;
          fWatchCreditCached = false;
          fAvailableCreditCached = false;
          fAvailableWatchCreditCached = false;
          fImmatureCreditCached = false;
          fImmatureWatchCreditCached = false;
          fChangeCached = false;
          nDebitCached = 0;
          nWatchDebitCached = 0;
          nCreditCached = 0;
          nWatchCreditCached = 0;
          nAvailableCreditCached = 0;
          nAvailableWatchCreditCached = 0;
          nImmatureCreditCached = 0;
          nImmatureWatchCreditCached = 0;
          nChangeCached = 0;
          nOrderPos = -1;
      }
  
      IMPLEMENT_SERIALIZE
      (
          CWalletTx* pthis = const_cast<CWalletTx*>(this);
          if (fRead)
              pthis->Init(NULL);
          char fSpent = false;
  
          if (!fRead)
          {
              pthis->mapValue["fromaccount"] = pthis->strFromAccount;
  
              std::string str;
              BOOST_FOREACH(char f, vfSpent)
              {
                  str += (f ? '1' : '0');
                  if (f)
                      fSpent = true;
              }
              pthis->mapValue["spent"] = str;
  
              WriteOrderPos(pthis->nOrderPos, pthis->mapValue);
  
              if (nTimeSmart)
                  pthis->mapValue["timesmart"] = strprintf("%u", nTimeSmart);
          }
  
          nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion,ser_action);
          READWRITE(vtxPrev);
          READWRITE(mapValue);
          READWRITE(vOrderForm);
          READWRITE(fTimeReceivedIsTxTime);
          READWRITE(nTimeReceived);
          READWRITE(fFromMe);
          READWRITE(fSpent);
  
          if (fRead)
          {
              pthis->strFromAccount = pthis->mapValue["fromaccount"];
  
              if (mapValue.count("spent"))
                  BOOST_FOREACH(char c, pthis->mapValue["spent"])
                      pthis->vfSpent.push_back(c != '0');
              else
                  pthis->vfSpent.assign(vout.size(), fSpent);
  
              ReadOrderPos(pthis->nOrderPos, pthis->mapValue);
  
              pthis->nTimeSmart = mapValue.count("timesmart") ? (unsigned int)atoi64(pthis->mapValue["timesmart"]) : 0;
          }
  
          pthis->mapValue.erase("fromaccount");
          pthis->mapValue.erase("version");
          pthis->mapValue.erase("spent");
          pthis->mapValue.erase("n");
          pthis->mapValue.erase("timesmart");
      )
  
      // marks certain txout's as spent
      // returns true if any update took place
      bool UpdateSpent(const std::vector<char>& vfNewSpent);
  
      // make sure balances are recalculated
      void MarkDirty();
      void BindWallet(CWallet *pwalletIn);
      void MarkSpent(unsigned int nOut);
      void MarkUnspent(unsigned int nOut);
      bool IsSpent(unsigned int nOut) const;
  
      int64_t GetDebit(const isminefilter& filter) const;
      int64_t GetCredit(const isminefilter& filter) const;
      int64_t GetImmatureCredit(bool fUseCache=true) const;
      int64_t GetImmatureWatchOnlyCredit(bool fUseCache=true) const;
      int64_t GetAvailableCredit(bool fUseCache=true) const;
      int64_t GetAvailableWatchCredit(bool fUseCache=true) const;
      int64_t GetChange() const;
  
      void GetAmounts(int64_t& nGeneratedImmature, int64_t& nGeneratedMature, std::list<std::pair<CBitcoinAddress, int64_t> >& listReceived,
                      std::list<std::pair<CBitcoinAddress, int64_t> >& listSent, int64_t& nFee, std::string& strSentAccount, const isminefilter& filter) const;
  
      void GetAccountAmounts(const std::string& strAccount, int64_t& nGenerated, int64_t& nReceived,
                             int64_t& nSent, int64_t& nFee, const isminefilter& filter) const;
  
      bool IsFromMe(const isminefilter& filter) const
      {
          return (GetDebit(filter) > 0);
      }
  
      bool InMempool() const;
      bool IsTrusted() const;
  
      bool WriteToDisk();
  
      int64_t GetTxTime() const;
      int GetRequestCount() const;
  
      void AddSupportingTransactions(CTxDB& txdb);
  
      bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
      bool AcceptWalletTransaction();
  
      bool RelayWalletTransaction(CTxDB& txdb);
      bool RelayWalletTransaction();
  };
  
  
  
  
  class COutput
  {
  public:
      const CWalletTx *tx;
      int i;
      int nDepth;
      bool fSpendable;
  
      COutput(const CWalletTx *txIn, int iIn, int nDepthIn, bool fSpendableIn)
      {
          tx = txIn; i = iIn; nDepth = nDepthIn; fSpendable = fSpendableIn;
      }
  
      std::string ToString() const
      {
          return strprintf("COutput(%s, %d, %d, %d) [%s]", tx->GetHash().ToString().substr(0,10).c_str(), i, fSpendable, nDepth, FormatMoney(tx->vout[i].nValue).c_str());
      }
  };
  
  
  
  
  /** Private key that includes an expiration date in case it never gets used. */
  class CWalletKey
  {
  public:
      CPrivKey vchPrivKey;
      int64_t nTimeCreated;
      int64_t nTimeExpires;
      std::string strComment;
      //// todo: add something to note what created it (user, getnewaddress, change)
      ////   maybe should have a map<string, string> property map
  
      CWalletKey(int64_t nExpires=0)
      {
          nTimeCreated = (nExpires ? GetTime() : 0);
          nTimeExpires = nExpires;
      }
  
      IMPLEMENT_SERIALIZE
      (
          if (!(nType & SER_GETHASH))
              READWRITE(nVersion);
          READWRITE(vchPrivKey);
          READWRITE(nTimeCreated);
          READWRITE(nTimeExpires);
          READWRITE(strComment);
      )
  };
  
  
  
  
  
  
  /** Account information.
   * Stored in wallet with key "acc"+string account name.
   */
  class CAccount
  {
  public:
      CPubKey vchPubKey;
  
      CAccount()
      {
          SetNull();
      }
  
      void SetNull()
      {
          vchPubKey = CPubKey();
      }
  
      IMPLEMENT_SERIALIZE
      (
          if (!(nType & SER_GETHASH))
              READWRITE(nVersion);
          READWRITE(vchPubKey);
      )
  };
  
  
  
  /** Internal transfers.
   * Database key is acentry<account><counter>.
   */
  class CAccountingEntry
  {
  public:
      std::string strAccount;
      int64_t nCreditDebit;
      int64_t nTime;
      std::string strOtherAccount;
      std::string strComment;
      mapValue_t mapValue;
      int64_t nOrderPos;  // position in ordered transaction list
      uint64_t nEntryNo;
  
      CAccountingEntry()
      {
          SetNull();
      }
  
      void SetNull()
      {
          nCreditDebit = 0;
          nTime = 0;
          strAccount.clear();
          strOtherAccount.clear();
          strComment.clear();
          nOrderPos = -1;
      }
  
      IMPLEMENT_SERIALIZE
      (
          CAccountingEntry& me = *const_cast<CAccountingEntry*>(this);
          if (!(nType & SER_GETHASH))
              READWRITE(nVersion);
          // Note: strAccount is serialized as part of the key, not here.
          READWRITE(nCreditDebit);
          READWRITE(nTime);
          READWRITE(strOtherAccount);
  
          if (!fRead)
          {
              WriteOrderPos(nOrderPos, me.mapValue);
  
              if (!(mapValue.empty() && _ssExtra.empty()))
              {
                  CDataStream ss(nType, nVersion);
                  ss.insert(ss.begin(), '\0');
                  ss << mapValue;
                  ss.insert(ss.end(), _ssExtra.begin(), _ssExtra.end());
                  me.strComment.append(ss.str());
              }
          }
  
          READWRITE(strComment);
  
          size_t nSepPos = strComment.find("\0", 0, 1);
          if (fRead)
          {
              me.mapValue.clear();
              if (std::string::npos != nSepPos)
              {
                  CDataStream ss(std::vector<char>(strComment.begin() + nSepPos + 1, strComment.end()), nType, nVersion);
                  ss >> me.mapValue;
                  me._ssExtra = std::vector<char>(ss.begin(), ss.end());
              }
              ReadOrderPos(me.nOrderPos, me.mapValue);
          }
          if (std::string::npos != nSepPos)
              me.strComment.erase(nSepPos);
  
          me.mapValue.erase("n");
      )
  
  private:
      std::vector<char> _ssExtra;
  };
  
  bool GetWalletFile(CWallet* pwallet, std::string &strWalletFileOut);
  
  #endif
  