text: // Copyright (c) 2009-2018 The Bitcoin Core developers
  // Copyright (c) 2021 The MogCoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <core_io.h>
  
  #include <primitives/block.h>
  #include <primitives/transaction.h>
  #include <script/script.h>
  #include <script/sign.h>
  #include <serialize.h>
  #include <streams.h>
  #include <univalue.h>
  #include <util.h>
  #include <utilstrencodings.h>
  #include <version.h>
  
  #include <boost/algorithm/string/classification.hpp>
  #include <boost/algorithm/string/replace.hpp>
  #include <boost/algorithm/string/split.hpp>
  
  #include <algorithm>
  
  CScript ParseScript(const std::string& s)
  {
      CScript result;
  
      static std::map<std::string, opcodetype> mapOpNames;
  
      if (mapOpNames.empty())
      {
          for (unsigned int op = 0; op <= MAX_OPCODE; op++)
          {
              // Allow OP_RESERVED to get into mapOpNames
              if (op < OP_NOP && op != OP_RESERVED)
                  continue;
  
              const char* name = GetOpName(static_cast<opcodetype>(op));
              if (strcmp(name, "OP_UNKNOWN") == 0)
                  continue;
              std::string strName(name);
              mapOpNames[strName] = static_cast<opcodetype>(op);
              // Convenience: OP_ADD and just ADD are both recognized:
              boost::algorithm::replace_first(strName, "OP_", "");
              mapOpNames[strName] = static_cast<opcodetype>(op);
          }
      }
  
      std::vector<std::string> words;
      boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);
  
      for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
      {
          if (w->empty())
          {
              // Empty string, ignore. (boost::split given '' will return one word)
          }
          else if (std::all_of(w->begin(), w->end(), ::IsDigit) ||
              (w->front() == '-' && w->size() > 1 && std::all_of(w->begin()+1, w->end(), ::IsDigit)))
          {
              // Number
              int64_t n = atoi64(*w);
              result << n;
          }
          else if (w->substr(0,2) == "0x" && w->size() > 2 && IsHex(std::string(w->begin()+2, w->end())))
          {
              // Raw hex data, inserted NOT pushed onto stack:
              std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
              result.insert(result.end(), raw.begin(), raw.end());
          }
          else if (w->size() >= 2 && w->front() == '\'' && w->back() == '\'')
          {
              // Single-quoted string, pushed as data. NOTE: this is poor-man's
              // parsing, spaces/tabs/newlines in single-quoted strings won't work.
              std::vector<unsigned char> value(w->begin()+1, w->end()-1);
              result << value;
          }
          else if (mapOpNames.count(*w))
          {
              // opcode, e.g. OP_ADD or ADD:
              result << mapOpNames[*w];
          }
          else
          {
              throw std::runtime_error("script parse error");
          }
      }
  
      return result;
  }
  
  // Check that all of the input and output scripts of a transaction contains valid opcodes
  static bool CheckTxScriptsSanity(const CMutableTransaction& tx)
  {
      // Check input scripts for non-coinbase txs
      if (!CTransaction(tx).IsCoinBase()) {
          for (unsigned int i = 0; i < tx.vin.size(); i++) {
              if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
                  return false;
              }
          }
      }
      // Check output scripts
      for (unsigned int i = 0; i < tx.vout.size(); i++) {
          if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
              return false;
          }
      }
  
      return true;
  }
  
  bool DecodeHexTx(CMutableTransaction& tx, const std::string& hex_tx, bool try_no_witness, bool try_witness)
  {
      if (!IsHex(hex_tx)) {
          return false;
      }
  
      std::vector<unsigned char> txData(ParseHex(hex_tx));
  
      if (try_no_witness) {
          CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS);
          try {
              ssData >> tx;
              if (ssData.eof() && (!try_witness || CheckTxScriptsSanity(tx))) {
                  return true;
              }
          } catch (const std::exception&) {
              // Fall through.
          }
      }
  
      if (try_witness) {
          CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
          try {
              ssData >> tx;
              if (ssData.empty()) {
                  return true;
              }
          } catch (const std::exception&) {
              // Fall through.
          }
      }
  
      return false;
  }
  
  bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
  {
      if (!IsHex(strHexBlk))
          return false;
  
      std::vector<unsigned char> blockData(ParseHex(strHexBlk));
      CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
      try {
          ssBlock >> block;
      }
      catch (const std::exception&) {
          return false;
      }
  
      return true;
  }
  
  bool DecodePSBT(PartiallySignedTransaction& psbt, const std::string& base64_tx, std::string& error)
  {
      std::vector<unsigned char> tx_data = DecodeBase64(base64_tx.c_str());
      CDataStream ss_data(tx_data, SER_NETWORK, PROTOCOL_VERSION);
      try {
          ss_data >> psbt;
          if (!ss_data.empty()) {
              error = "extra data after PSBT";
              return false;
          }
      } catch (const std::exception& e) {
          error = e.what();
          return false;
      }
      return true;
  }
  
  uint256 ParseHashStr(const std::string& strHex, const std::string& strName)
  {
      if (!IsHex(strHex)) // Note: IsHex("") is false
          throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
  
      uint256 result;
      result.SetHex(strHex);
      return result;
  }
  
  std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
  {
      std::string strHex;
      if (v.isStr())
          strHex = v.getValStr();
      if (!IsHex(strHex))
          throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
      return ParseHex(strHex);
  }
  
  int ParseSighashString(const UniValue& sighash)
  {
      int hash_type = SIGHASH_ALL;
      if (!sighash.isNull()) {
          static std::map<std::string, int> map_sighash_values = {
              {std::string("ALL"), int(SIGHASH_ALL)},
              {std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
              {std::string("NONE"), int(SIGHASH_NONE)},
              {std::string("NONE|ANYONECANPAY"), int(SIGHASH_NONE|SIGHASH_ANYONECANPAY)},
              {std::string("SINGLE"), int(SIGHASH_SINGLE)},
              {std::string("SINGLE|ANYONECANPAY"), int(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY)},
          };
          std::string strHashType = sighash.get_str();
          const auto& it = map_sighash_values.find(strHashType);
          if (it != map_sighash_values.end()) {
              hash_type = it->second;
          } else {
              throw std::runtime_error(strHashType + " is not a valid sighash parameter.");
          }
      }
      return hash_type;
  }
  