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core_write.cpp
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// 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 <core_io.h>
#include <config.h>
#include <key_io.h>
#include <primitives/transaction.h>
#include <script/script.h>
#include <script/sigencoding.h>
#include <script/standard.h>
#include <serialize.h>
#include <streams.h>
#include <util/strencodings.h>
#include <util/system.h>
#include <univalue.h>
std::string FormatScript(const CScript &script) {
std::string ret;
CScript::const_iterator it = script.begin();
opcodetype op;
while (it != script.end()) {
CScript::const_iterator it2 = it;
std::vector<uint8_t> vch;
if (script.GetOp(it, op, vch)) {
if (op == OP_0) {
ret += "0 ";
continue;
}
if ((op >= OP_1 && op <= OP_16) || op == OP_1NEGATE) {
ret += strprintf("%i ", op - OP_1NEGATE - 1);
continue;
}
if (op >= OP_NOP && op < FIRST_UNDEFINED_OP_VALUE) {
std::string str(GetOpName(op));
if (str.substr(0, 3) == std::string("OP_")) {
ret += str.substr(3, std::string::npos) + " ";
continue;
}
}
if (vch.size() > 0) {
ret += strprintf(
"0x%x 0x%x ",
HexStr(std::vector<uint8_t>(it2, it - vch.size())),
HexStr(std::vector<uint8_t>(it - vch.size(), it)));
} else {
ret +=
strprintf("0x%x ", HexStr(std::vector<uint8_t>(it2, it)));
}
continue;
}
ret +=
strprintf("0x%x ", HexStr(std::vector<uint8_t>(it2, script.end())));
break;
}
return ret.substr(0, ret.size() - 1);
}
const std::map<uint8_t, std::string> mapSigHashTypes = {
{SIGHASH_ALL, "ALL"},
{SIGHASH_ALL | SIGHASH_ANYONECANPAY, "ALL|ANYONECANPAY"},
{SIGHASH_ALL | SIGHASH_FORKID, "ALL|FORKID"},
{SIGHASH_ALL | SIGHASH_FORKID | SIGHASH_ANYONECANPAY,
"ALL|FORKID|ANYONECANPAY"},
{SIGHASH_NONE, "NONE"},
{SIGHASH_NONE | SIGHASH_ANYONECANPAY, "NONE|ANYONECANPAY"},
{SIGHASH_NONE | SIGHASH_FORKID, "NONE|FORKID"},
{SIGHASH_NONE | SIGHASH_FORKID | SIGHASH_ANYONECANPAY,
"NONE|FORKID|ANYONECANPAY"},
{SIGHASH_SINGLE, "SINGLE"},
{SIGHASH_SINGLE | SIGHASH_ANYONECANPAY, "SINGLE|ANYONECANPAY"},
{SIGHASH_SINGLE | SIGHASH_FORKID, "SINGLE|FORKID"},
{SIGHASH_SINGLE | SIGHASH_FORKID | SIGHASH_ANYONECANPAY,
"SINGLE|FORKID|ANYONECANPAY"},
};
std::string SighashToStr(uint8_t sighash_type) {
const auto &it = mapSigHashTypes.find(sighash_type);
if (it == mapSigHashTypes.end()) {
return "";
}
return it->second;
}
/**
* Create the assembly string representation of a CScript object.
* @param[in] script CScript object to convert into the asm string
* representation.
* @param[in] fAttemptSighashDecode Whether to attempt to decode sighash
* types on data within the script that matches the format of a signature. Only
* pass true for scripts you believe could contain signatures. For example, pass
* false, or omit the this argument (defaults to false), for scriptPubKeys.
*/
std::string ScriptToAsmStr(const CScript &script,
const bool fAttemptSighashDecode) {
std::string str;
opcodetype opcode;
std::vector<uint8_t> vch;
CScript::const_iterator pc = script.begin();
while (pc < script.end()) {
if (!str.empty()) {
str += " ";
}
if (!script.GetOp(pc, opcode, vch)) {
str += "[error]";
return str;
}
if (0 <= opcode && opcode <= OP_PUSHDATA4) {
if (vch.size() <= static_cast<std::vector<uint8_t>::size_type>(4)) {
str += strprintf("%d", CScriptNum(vch, false).getint());
} else {
// the IsUnspendable check makes sure not to try to decode
// OP_RETURN data that may match the format of a signature
if (fAttemptSighashDecode && !script.IsUnspendable()) {
std::string strSigHashDecode;
// goal: only attempt to decode a defined sighash type from
// data that looks like a signature within a scriptSig. This
// won't decode correctly formatted public keys in Pubkey or
// Multisig scripts due to the restrictions on the pubkey
// formats (see IsCompressedOrUncompressedPubKey) being
// incongruous with the checks in
// CheckTransactionSignatureEncoding.
uint32_t flags = SCRIPT_VERIFY_STRICTENC;
if (vch.back() & SIGHASH_FORKID) {
// If the transaction is using SIGHASH_FORKID, we need
// to set the appropriate flag.
// TODO: Remove after the Hard Fork.
flags |= SCRIPT_ENABLE_SIGHASH_FORKID;
}
if (CheckTransactionSignatureEncoding(vch, flags,
nullptr)) {
const uint8_t chSigHashType = vch.back();
if (mapSigHashTypes.count(chSigHashType)) {
strSigHashDecode =
"[" +
mapSigHashTypes.find(chSigHashType)->second +
"]";
// remove the sighash type byte. it will be replaced
// by the decode.
vch.pop_back();
}
}
str += HexStr(vch) + strSigHashDecode;
} else {
str += HexStr(vch);
}
}
} else {
str += GetOpName(opcode);
}
}
return str;
}
std::string EncodeHexTx(const CTransaction &tx, const int serializeFlags) {
CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION | serializeFlags);
ssTx << tx;
return HexStr(ssTx);
}
void ScriptToUniv(const CScript &script, UniValue &out, bool include_address) {
out.pushKV("asm", ScriptToAsmStr(script));
out.pushKV("hex", HexStr(script));
std::vector<std::vector<uint8_t>> solns;
TxoutType type = Solver(script, solns);
out.pushKV("type", GetTxnOutputType(type));
CTxDestination address;
if (include_address && ExtractDestination(script, address) &&
type != TxoutType::PUBKEY) {
out.pushKV("address", EncodeDestination(address, GetConfig()));
}
}
void ScriptPubKeyToUniv(const CScript &scriptPubKey, UniValue &out,
bool fIncludeHex) {
TxoutType type;
std::vector<CTxDestination> addresses;
int nRequired;
out.pushKV("asm", ScriptToAsmStr(scriptPubKey));
if (fIncludeHex) {
out.pushKV("hex", HexStr(scriptPubKey));
}
if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired) ||
type == TxoutType::PUBKEY) {
out.pushKV("type", GetTxnOutputType(type));
return;
}
out.pushKV("reqSigs", nRequired);
out.pushKV("type", GetTxnOutputType(type));
UniValue a(UniValue::VARR);
for (const CTxDestination &addr : addresses) {
a.push_back(EncodeDestination(addr, GetConfig()));
}
out.pushKV("addresses", a);
}
void TxToUniv(const CTransaction &tx, const uint256 &hashBlock, UniValue &entry,
bool include_hex, int serialize_flags) {
entry.pushKV("txid", tx.GetId().GetHex());
entry.pushKV("hash", tx.GetHash().GetHex());
entry.pushKV("version", tx.nVersion);
entry.pushKV("size", (int)::GetSerializeSize(tx, PROTOCOL_VERSION));
entry.pushKV("locktime", (int64_t)tx.nLockTime);
UniValue vin(UniValue::VARR);
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const CTxIn &txin = tx.vin[i];
UniValue in(UniValue::VOBJ);
if (tx.IsCoinBase()) {
in.pushKV("coinbase", HexStr(txin.scriptSig));
} else {
in.pushKV("txid", txin.prevout.GetTxId().GetHex());
in.pushKV("vout", int64_t(txin.prevout.GetN()));
UniValue o(UniValue::VOBJ);
o.pushKV("asm", ScriptToAsmStr(txin.scriptSig, true));
o.pushKV("hex", HexStr(txin.scriptSig));
in.pushKV("scriptSig", o);
}
in.pushKV("sequence", (int64_t)txin.nSequence);
vin.push_back(in);
}
entry.pushKV("vin", vin);
UniValue vout(UniValue::VARR);
for (unsigned int i = 0; i < tx.vout.size(); i++) {
const CTxOut &txout = tx.vout[i];
UniValue out(UniValue::VOBJ);
out.pushKV("value", txout.nValue);
out.pushKV("n", int64_t(i));
UniValue o(UniValue::VOBJ);
ScriptPubKeyToUniv(txout.scriptPubKey, o, true);
out.pushKV("scriptPubKey", o);
vout.push_back(out);
}
entry.pushKV("vout", vout);
if (!hashBlock.IsNull()) {
entry.pushKV("blockhash", hashBlock.GetHex());
}
if (include_hex) {
// The hex-encoded transaction. Used the name "hex" to be consistent
// with the verbose output of "getrawtransaction".
entry.pushKV("hex", EncodeHexTx(tx, serialize_flags));
}
}

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