text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2016 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "primitives/transaction.h"
  
  #include "hash.h"
  #include "tinyformat.h"
  #include "utilstrencodings.h"
  
  std::string COutPoint::ToString() const
  {
      return strprintf("COutPoint(%s, %u)", hash.ToHexString().substr(0,10), n);
  }
  
  CTxIn::CTxIn(COutPoint prevoutIn, CScript scriptSigIn, uint32_t nSequenceIn)
  {
      prevout = prevoutIn;
      scriptSig = scriptSigIn;
      nSequence = nSequenceIn;
  }
  
  CTxIn::CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn, uint32_t nSequenceIn)
  {
      prevout = COutPoint(hashPrevTx, nOut);
      scriptSig = scriptSigIn;
      nSequence = nSequenceIn;
  }
  
  std::string CTxIn::ToString() const
  {
      std::string str;
      str += "CTxIn(";
      str += prevout.ToString();
      if (prevout.IsNull())
          str += strprintf(", coinbase %s", HexStr(scriptSig));
      else
          str += strprintf(", scriptSig=%s", HexStr(scriptSig).substr(0, 24));
      if (nSequence != SEQUENCE_FINAL)
          str += strprintf(", nSequence=%u", nSequence);
      str += ")";
      return str;
  }
  
  CTxOut::CTxOut(const CAmount& nValueIn, CScript scriptPubKeyIn)
  {
      nValue = nValueIn;
      scriptPubKey = scriptPubKeyIn;
  }
  
  std::string CTxOut::ToString() const
  {
      return strprintf("CTxOut(nValue=%d.%08d, scriptPubKey=%s)", nValue / COIN, nValue % COIN, HexStr(scriptPubKey).substr(0, 30));
  }
  
  CMutableTransaction::CMutableTransaction() : nVersion(CTransaction::CURRENT_VERSION), nLockTime(0) {}
  CMutableTransaction::CMutableTransaction(const CTransaction& tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime) {}
  
  uint256 CMutableTransaction::GetHash() const
  {
      return SerializeHash(*this, SER_GETHASH, SERIALIZE_TRANSACTION_NO_WITNESS);
  }
  
  uint256 CTransaction::ComputeHash() const
  {
      return SerializeHash(*this, SER_GETHASH, SERIALIZE_TRANSACTION_NO_WITNESS);
  }
  
  uint256 CTransaction::GetWitnessHash() const
  {
      return SerializeHash(*this, SER_GETHASH, 0);
  }
  
  /* For backward compatibility, the hash is initialized to 0. TODO: remove the need for this default constructor entirely. */
  CTransaction::CTransaction() : nVersion(CTransaction::CURRENT_VERSION), vin(), vout(), nLockTime(0), hash() {}
  CTransaction::CTransaction(const CMutableTransaction &tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
  CTransaction::CTransaction(CMutableTransaction &&tx) : nVersion(tx.nVersion), vin(std::move(tx.vin)), vout(std::move(tx.vout)), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
  
  CAmount CTransaction::GetValueOut() const
  {
      CAmount nValueOut = 0;
      for (std::vector<CTxOut>::const_iterator it(vout.begin()); it != vout.end(); ++it)
      {
          nValueOut += it->nValue;
          if (!MoneyRange(it->nValue) || !MoneyRange(nValueOut))
              throw std::runtime_error(std::string(__func__) + ": value out of range");
      }
      return nValueOut;
  }
  
  double CTransaction::ComputePriority(double dPriorityInputs, unsigned int nTxSize) const
  {
      nTxSize = CalculateModifiedSize(nTxSize);
      if (nTxSize == 0) return 0.0;
  
      return dPriorityInputs / nTxSize;
  }
  
  unsigned int CTransaction::CalculateModifiedSize(unsigned int nTxSize) const
  {
      // In order to avoid disincentivizing cleaning up the UTXO set we don't count
      // the constant overhead for each txin and up to 110 bytes of scriptSig (which
      // is enough to cover a compressed pubkey p2sh redemption) for priority.
      // Providing any more cleanup incentive than making additional inputs free would
      // risk encouraging people to create junk outputs to redeem later.
      if (nTxSize == 0)
          nTxSize = (GetTransactionWeight(*this) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
      for (std::vector<CTxIn>::const_iterator it(vin.begin()); it != vin.end(); ++it)
      {
          unsigned int offset = 41U + std::min(110U, (unsigned int)it->scriptSig.size());
          if (nTxSize > offset)
              nTxSize -= offset;
      }
      return nTxSize;
  }
  
  unsigned int CTransaction::GetTotalSize() const
  {
      return ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
  }
  
  std::string CTransaction::ToString() const
  {
      std::string str;
      str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%u, vout.size=%u, nLockTime=%u)\n",
          GetHash().ToHexString().substr(0,10),
          nVersion,
          vin.size(),
          vout.size(),
          nLockTime);
      for (unsigned int i = 0; i < vin.size(); i++)
          str += "    " + vin[i].ToString() + "\n";
      for (unsigned int i = 0; i < vin.size(); i++)
          str += "    " + vin[i].scriptWitness.ToString() + "\n";
      for (unsigned int i = 0; i < vout.size(); i++)
          str += "    " + vout[i].ToString() + "\n";
      return str;
  }
  
  int64_t GetTransactionWeight(const CTransaction& tx)
  {
      return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR -1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
  }
  