text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2013  The Ocoin developer
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef H_BOUNTYCOIN_SCRIPT
  #define H_BOUNTYCOIN_SCRIPT
  
  #include <string>
  #include <vector>
  
  #include <boost/foreach.hpp>
  #include <boost/variant.hpp>
  
  #include "keystore.h"
  #include "bignum.h"
  
  typedef std::vector<unsigned char> valtype;
  
  class CTransaction;
  
  /** Signature hash types/flags */
  enum
  {
      SIGHASH_ALL = 1,
      SIGHASH_NONE = 2,
      SIGHASH_SINGLE = 3,
      SIGHASH_ANYONECANPAY = 0x80,
  };
  
  
  enum txnouttype
  {
      TX_NONSTANDARD,
      // 'standard' transaction types:
      TX_PUBKEY,
      TX_PUBKEYHASH,
      TX_SCRIPTHASH,
      TX_MULTISIG,
  };
  
  class CNoDestination {
  public:
      friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
      friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
  };
  
  /** A txout script template with a specific destination. It is either:
   *  * CNoDestination: no destination set
   *  * CKeyID: TX_PUBKEYHASH destination
   *  * CScriptID: TX_SCRIPTHASH destination
   *  A CTxDestination is the internal data type encoded in a COcoinAddress
   */
  typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
  
  const char* GetTxnOutputType(txnouttype t);
  
  /** Script opcodes */
  enum opcodetype
  {
      // push value
      OP_0 = 0x00,
      OP_FALSE = OP_0,
      OP_PUSHDATA1 = 0x4c,
      OP_PUSHDATA2 = 0x4d,
      OP_PUSHDATA4 = 0x4e,
      OP_1NEGATE = 0x4f,
      OP_RESERVED = 0x50,
      OP_1 = 0x51,
      OP_TRUE=OP_1,
      OP_2 = 0x52,
      OP_3 = 0x53,
      OP_4 = 0x54,
      OP_5 = 0x55,
      OP_6 = 0x56,
      OP_7 = 0x57,
      OP_8 = 0x58,
      OP_9 = 0x59,
      OP_10 = 0x5a,
      OP_11 = 0x5b,
      OP_12 = 0x5c,
      OP_13 = 0x5d,
      OP_14 = 0x5e,
      OP_15 = 0x5f,
      OP_16 = 0x60,
  
      // control
      OP_NOP = 0x61,
      OP_VER = 0x62,
      OP_IF = 0x63,
      OP_NOTIF = 0x64,
      OP_VERIF = 0x65,
      OP_VERNOTIF = 0x66,
      OP_ELSE = 0x67,
      OP_ENDIF = 0x68,
      OP_VERIFY = 0x69,
      OP_RETURN = 0x6a,
  
      // stack ops
      OP_TOALTSTACK = 0x6b,
      OP_FROMALTSTACK = 0x6c,
      OP_2DROP = 0x6d,
      OP_2DUP = 0x6e,
      OP_3DUP = 0x6f,
      OP_2OVER = 0x70,
      OP_2ROT = 0x71,
      OP_2SWAP = 0x72,
      OP_IFDUP = 0x73,
      OP_DEPTH = 0x74,
      OP_DROP = 0x75,
      OP_DUP = 0x76,
      OP_NIP = 0x77,
      OP_OVER = 0x78,
      OP_PICK = 0x79,
      OP_ROLL = 0x7a,
      OP_ROT = 0x7b,
      OP_SWAP = 0x7c,
      OP_TUCK = 0x7d,
  
      // splice ops
      OP_CAT = 0x7e,
      OP_SUBSTR = 0x7f,
      OP_LEFT = 0x80,
      OP_RIGHT = 0x81,
      OP_SIZE = 0x82,
  
      // bit logic
      OP_INVERT = 0x83,
      OP_AND = 0x84,
      OP_OR = 0x85,
      OP_XOR = 0x86,
      OP_EQUAL = 0x87,
      OP_EQUALVERIFY = 0x88,
      OP_RESERVED1 = 0x89,
      OP_RESERVED2 = 0x8a,
  
      // numeric
      OP_1ADD = 0x8b,
      OP_1SUB = 0x8c,
      OP_2MUL = 0x8d,
      OP_2DIV = 0x8e,
      OP_NEGATE = 0x8f,
      OP_ABS = 0x90,
      OP_NOT = 0x91,
      OP_0NOTEQUAL = 0x92,
  
      OP_ADD = 0x93,
      OP_SUB = 0x94,
      OP_MUL = 0x95,
      OP_DIV = 0x96,
      OP_MOD = 0x97,
      OP_LSHIFT = 0x98,
      OP_RSHIFT = 0x99,
  
      OP_BOOLAND = 0x9a,
      OP_BOOLOR = 0x9b,
      OP_NUMEQUAL = 0x9c,
      OP_NUMEQUALVERIFY = 0x9d,
      OP_NUMNOTEQUAL = 0x9e,
      OP_LESSTHAN = 0x9f,
      OP_GREATERTHAN = 0xa0,
      OP_LESSTHANOREQUAL = 0xa1,
      OP_GREATERTHANOREQUAL = 0xa2,
      OP_MIN = 0xa3,
      OP_MAX = 0xa4,
  
      OP_WITHIN = 0xa5,
  
      // crypto
      OP_RIPEMD160 = 0xa6,
      OP_SHA1 = 0xa7,
      OP_SHA256 = 0xa8,
      OP_HASH160 = 0xa9,
      OP_HASH256 = 0xaa,
      OP_CODESEPARATOR = 0xab,
      OP_CHECKSIG = 0xac,
      OP_CHECKSIGVERIFY = 0xad,
      OP_CHECKMULTISIG = 0xae,
      OP_CHECKMULTISIGVERIFY = 0xaf,
  
      // expansion
      OP_NOP1 = 0xb0,
      OP_NOP2 = 0xb1,
      OP_NOP3 = 0xb2,
      OP_NOP4 = 0xb3,
      OP_NOP5 = 0xb4,
      OP_NOP6 = 0xb5,
      OP_NOP7 = 0xb6,
      OP_NOP8 = 0xb7,
      OP_NOP9 = 0xb8,
      OP_NOP10 = 0xb9,
  
  
  
      // template matching params
      OP_SMALLINTEGER = 0xfa,
      OP_PUBKEYS = 0xfb,
      OP_PUBKEYHASH = 0xfd,
      OP_PUBKEY = 0xfe,
  
      OP_INVALIDOPCODE = 0xff,
  };
  
  const char* GetOpName(opcodetype opcode);
  
  
  
  inline std::string ValueString(const std::vector<unsigned char>& vch)
  {
      if (vch.size() <= 4)
          return strprintf("%d", CBigNum(vch).getint());
      else
          return HexStr(vch);
  }
  
  inline std::string StackString(const std::vector<std::vector<unsigned char> >& vStack)
  {
      std::string str;
      BOOST_FOREACH(const std::vector<unsigned char>& vch, vStack)
      {
          if (!str.empty())
              str += " ";
          str += ValueString(vch);
      }
      return str;
  }
  
  
  
  
  
  
  
  
  /** Serialized script, used inside transaction inputs and outputs */
  class CScript : public std::vector<unsigned char>
  {
  protected:
      CScript& push_int64(int64 n)
      {
          if (n == -1 || (n >= 1 && n <= 16))
          {
              push_back(n + (OP_1 - 1));
          }
          else
          {
              CBigNum bn(n);
              *this << bn.getvch();
          }
          return *this;
      }
  
      CScript& push_uint64(uint64 n)
      {
          if (n >= 1 && n <= 16)
          {
              push_back(n + (OP_1 - 1));
          }
          else
          {
              CBigNum bn(n);
              *this << bn.getvch();
          }
          return *this;
      }
  
  public:
      CScript() { }
      CScript(const CScript& b) : std::vector<unsigned char>(b.begin(), b.end()) { }
      CScript(const_iterator pbegin, const_iterator pend) : std::vector<unsigned char>(pbegin, pend) { }
  #ifndef _MSC_VER
      CScript(const unsigned char* pbegin, const unsigned char* pend) : std::vector<unsigned char>(pbegin, pend) { }
  #endif
  
      CScript& operator+=(const CScript& b)
      {
          insert(end(), b.begin(), b.end());
          return *this;
      }
  
      friend CScript operator+(const CScript& a, const CScript& b)
      {
          CScript ret = a;
          ret += b;
          return ret;
      }
  
  
      //explicit CScript(char b) is not portable.  Use 'signed char' or 'unsigned char'.
      explicit CScript(signed char b)    { operator<<(b); }
      explicit CScript(short b)          { operator<<(b); }
      explicit CScript(int b)            { operator<<(b); }
      explicit CScript(long b)           { operator<<(b); }
      explicit CScript(int64 b)          { operator<<(b); }
      explicit CScript(unsigned char b)  { operator<<(b); }
      explicit CScript(unsigned int b)   { operator<<(b); }
      explicit CScript(unsigned short b) { operator<<(b); }
      explicit CScript(unsigned long b)  { operator<<(b); }
      explicit CScript(uint64 b)         { operator<<(b); }
  
      explicit CScript(opcodetype b)     { operator<<(b); }
      explicit CScript(const uint256& b) { operator<<(b); }
      explicit CScript(const CBigNum& b) { operator<<(b); }
      explicit CScript(const std::vector<unsigned char>& b) { operator<<(b); }
  
  
      //CScript& operator<<(char b) is not portable.  Use 'signed char' or 'unsigned char'.
      CScript& operator<<(signed char b)    { return push_int64(b); }
      CScript& operator<<(short b)          { return push_int64(b); }
      CScript& operator<<(int b)            { return push_int64(b); }
      CScript& operator<<(long b)           { return push_int64(b); }
      CScript& operator<<(int64 b)          { return push_int64(b); }
      CScript& operator<<(unsigned char b)  { return push_uint64(b); }
      CScript& operator<<(unsigned int b)   { return push_uint64(b); }
      CScript& operator<<(unsigned short b) { return push_uint64(b); }
      CScript& operator<<(unsigned long b)  { return push_uint64(b); }
      CScript& operator<<(uint64 b)         { return push_uint64(b); }
  
      CScript& operator<<(opcodetype opcode)
      {
          if (opcode < 0 || opcode > 0xff)
              throw std::runtime_error("CScript::operator<<() : invalid opcode");
          insert(end(), (unsigned char)opcode);
          return *this;
      }
  
      CScript& operator<<(const uint160& b)
      {
          insert(end(), sizeof(b));
          insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
          return *this;
      }
  
      CScript& operator<<(const uint256& b)
      {
          insert(end(), sizeof(b));
          insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
          return *this;
      }
  
      CScript& operator<<(const CPubKey& key)
      {
          std::vector<unsigned char> vchKey = key.Raw();
          return (*this) << vchKey;
      }
  
      CScript& operator<<(const CBigNum& b)
      {
          *this << b.getvch();
          return *this;
      }
  
      CScript& operator<<(const std::vector<unsigned char>& b)
      {
          if (b.size() < OP_PUSHDATA1)
          {
              insert(end(), (unsigned char)b.size());
          }
          else if (b.size() <= 0xff)
          {
              insert(end(), OP_PUSHDATA1);
              insert(end(), (unsigned char)b.size());
          }
          else if (b.size() <= 0xffff)
          {
              insert(end(), OP_PUSHDATA2);
              unsigned short nSize = b.size();
              insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
          }
          else
          {
              insert(end(), OP_PUSHDATA4);
              unsigned int nSize = b.size();
              insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
          }
          insert(end(), b.begin(), b.end());
          return *this;
      }
  
      CScript& operator<<(const CScript& b)
      {
          // I'm not sure if this should push the script or concatenate scripts.
          // If there's ever a use for pushing a script onto a script, delete this member fn
          assert(!"Warning: Pushing a CScript onto a CScript with << is probably not intended, use + to concatenate!");
          return *this;
      }
  
  
      bool GetOp(iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet)
      {
           // Wrapper so it can be called with either iterator or const_iterator
           const_iterator pc2 = pc;
           bool fRet = GetOp2(pc2, opcodeRet, &vchRet);
           pc = begin() + (pc2 - begin());
           return fRet;
      }
  
      bool GetOp(iterator& pc, opcodetype& opcodeRet)
      {
           const_iterator pc2 = pc;
           bool fRet = GetOp2(pc2, opcodeRet, NULL);
           pc = begin() + (pc2 - begin());
           return fRet;
      }
  
      bool GetOp(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet) const
      {
          return GetOp2(pc, opcodeRet, &vchRet);
      }
  
      bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
      {
          return GetOp2(pc, opcodeRet, NULL);
      }
  
      bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
      {
          opcodeRet = OP_INVALIDOPCODE;
          if (pvchRet)
              pvchRet->clear();
          if (pc >= end())
              return false;
  
          // Read instruction
          if (end() - pc < 1)
              return false;
          unsigned int opcode = *pc++;
  
          // Immediate operand
          if (opcode <= OP_PUSHDATA4)
          {
              unsigned int nSize;
              if (opcode < OP_PUSHDATA1)
              {
                  nSize = opcode;
              }
              else if (opcode == OP_PUSHDATA1)
              {
                  if (end() - pc < 1)
                      return false;
                  nSize = *pc++;
              }
              else if (opcode == OP_PUSHDATA2)
              {
                  if (end() - pc < 2)
                      return false;
                  nSize = 0;
                  memcpy(&nSize, &pc[0], 2);
                  pc += 2;
              }
              else if (opcode == OP_PUSHDATA4)
              {
                  if (end() - pc < 4)
                      return false;
                  memcpy(&nSize, &pc[0], 4);
                  pc += 4;
              }
              if (end() - pc < 0 || (unsigned int)(end() - pc) < nSize)
                  return false;
              if (pvchRet)
                  pvchRet->assign(pc, pc + nSize);
              pc += nSize;
          }
  
          opcodeRet = (opcodetype)opcode;
          return true;
      }
  
      // Encode/decode small integers:
      static int DecodeOP_N(opcodetype opcode)
      {
          if (opcode == OP_0)
              return 0;
          assert(opcode >= OP_1 && opcode <= OP_16);
          return (int)opcode - (int)(OP_1 - 1);
      }
      static opcodetype EncodeOP_N(int n)
      {
          assert(n >= 0 && n <= 16);
          if (n == 0)
              return OP_0;
          return (opcodetype)(OP_1+n-1);
      }
  
      int FindAndDelete(const CScript& b)
      {
          int nFound = 0;
          if (b.empty())
              return nFound;
          iterator pc = begin();
          opcodetype opcode;
          do
          {
              while (end() - pc >= (long)b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
              {
                  erase(pc, pc + b.size());
                  ++nFound;
              }
          }
          while (GetOp(pc, opcode));
          return nFound;
      }
      int Find(opcodetype op) const
      {
          int nFound = 0;
          opcodetype opcode;
          for (const_iterator pc = begin(); pc != end() && GetOp(pc, opcode);)
              if (opcode == op)
                  ++nFound;
          return nFound;
      }
  
      // Pre-version-0.6, Ocoin always counted CHECKMULTISIGs
      // as 20 sigops. With pay-to-script-hash, that changed:
      // CHECKMULTISIGs serialized in scriptSigs are
      // counted more accurately, assuming they are of the form
      //  ... OP_N CHECKMULTISIG ...
      unsigned int GetSigOpCount(bool fAccurate) const;
  
      // Accurately count sigOps, including sigOps in
      // pay-to-script-hash transactions:
      unsigned int GetSigOpCount(const CScript& scriptSig) const;
  
      bool IsPayToScriptHash() const;
  
      // Called by CTransaction::IsStandard
      bool IsPushOnly() const
      {
          const_iterator pc = begin();
          while (pc < end())
          {
              opcodetype opcode;
              if (!GetOp(pc, opcode))
                  return false;
              if (opcode > OP_16)
                  return false;
          }
          return true;
      }
  
  
      void SetDestination(const CTxDestination& address);
      void SetMultisig(int nRequired, const std::vector<CKey>& keys);
  
  
      void PrintHex() const
      {
          printf("CScript(%s)\n", HexStr(begin(), end(), true).c_str());
      }
  
      std::string ToString(bool fShort=false) const
      {
          std::string str;
          opcodetype opcode;
          std::vector<unsigned char> vch;
          const_iterator pc = begin();
          while (pc < end())
          {
              if (!str.empty())
                  str += " ";
              if (!GetOp(pc, opcode, vch))
              {
                  str += "[error]";
                  return str;
              }
              if (0 <= opcode && opcode <= OP_PUSHDATA4)
                  str += fShort? ValueString(vch).substr(0, 10) : ValueString(vch);
              else
                  str += GetOpName(opcode);
          }
          return str;
      }
  
      void print() const
      {
          printf("%s\n", ToString().c_str());
      }
  
      CScriptID GetID() const
      {
          return CScriptID(Hash160(*this));
      }
  };
  
  
  
  
  
  bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType);
  bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
  int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
  bool IsStandard(const CScript& scriptPubKey);
  bool IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
  bool IsMine(const CKeyStore& keystore, const CTxDestination &dest);
  bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
  bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
  bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
  bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
  bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
                    bool fValidatePayToScriptHash, int nHashType);
  bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType);
  
  // Given two sets of signatures for scriptPubKey, possibly with OP_0 placeholders,
  // combine them intelligently and return the result.
  CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn, const CScript& scriptSig1, const CScript& scriptSig2);
  
  #endif
  