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704 lines
21 KiB
704 lines
21 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2013 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_CORE_H
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#define BITCOIN_CORE_H
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#include "script.h"
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#include "serialize.h"
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#include "uint256.h"
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#include <stdint.h>
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#include <boost/foreach.hpp>
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class CTransaction;
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/** An outpoint - a combination of a transaction hash and an index n into its vout */
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class COutPoint
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{
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public:
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uint256 hash;
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unsigned int n;
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COutPoint() { SetNull(); }
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COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
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IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
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void SetNull() { hash = 0; n = (unsigned int) -1; }
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bool IsNull() const { return (hash == 0 && n == (unsigned int) -1); }
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friend bool operator<(const COutPoint& a, const COutPoint& b)
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{
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return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
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}
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friend bool operator==(const COutPoint& a, const COutPoint& b)
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{
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return (a.hash == b.hash && a.n == b.n);
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}
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friend bool operator!=(const COutPoint& a, const COutPoint& b)
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{
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return !(a == b);
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}
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std::string ToString() const;
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void print() const;
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};
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/** An inpoint - a combination of a transaction and an index n into its vin */
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class CInPoint
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{
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public:
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CTransaction* ptx;
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unsigned int n;
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CInPoint() { SetNull(); }
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CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
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void SetNull() { ptx = NULL; n = (unsigned int) -1; }
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bool IsNull() const { return (ptx == NULL && n == (unsigned int) -1); }
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};
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/** An input of a transaction. It contains the location of the previous
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* transaction's output that it claims and a signature that matches the
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* output's public key.
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*/
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class CTxIn
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{
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public:
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COutPoint prevout;
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CScript scriptSig;
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unsigned int nSequence;
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CTxIn()
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{
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nSequence = std::numeric_limits<unsigned int>::max();
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}
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explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max());
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CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max());
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IMPLEMENT_SERIALIZE
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(
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READWRITE(prevout);
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READWRITE(scriptSig);
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READWRITE(nSequence);
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)
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bool IsFinal() const
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{
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return (nSequence == std::numeric_limits<unsigned int>::max());
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}
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friend bool operator==(const CTxIn& a, const CTxIn& b)
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{
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return (a.prevout == b.prevout &&
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a.scriptSig == b.scriptSig &&
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a.nSequence == b.nSequence);
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}
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friend bool operator!=(const CTxIn& a, const CTxIn& b)
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{
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return !(a == b);
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}
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std::string ToString() const;
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void print() const;
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};
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/** An output of a transaction. It contains the public key that the next input
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* must be able to sign with to claim it.
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*/
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class CTxOut
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{
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public:
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int64_t nValue;
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CScript scriptPubKey;
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CTxOut()
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{
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SetNull();
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}
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CTxOut(int64_t nValueIn, CScript scriptPubKeyIn);
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IMPLEMENT_SERIALIZE
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(
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READWRITE(nValue);
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READWRITE(scriptPubKey);
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)
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void SetNull()
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{
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nValue = -1;
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scriptPubKey.clear();
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}
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bool IsNull() const
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{
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return (nValue == -1);
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}
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uint256 GetHash() const;
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bool IsDust(int64_t nMinRelayTxFee) const
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{
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// "Dust" is defined in terms of CTransaction::nMinRelayTxFee,
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// which has units satoshis-per-kilobyte.
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// If you'd pay more than 1/3 in fees
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// to spend something, then we consider it dust.
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// A typical txout is 34 bytes big, and will
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// need a CTxIn of at least 148 bytes to spend,
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// so dust is a txout less than 54 uBTC
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// (5460 satoshis) with default nMinRelayTxFee
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return ((nValue*1000)/(3*((int)GetSerializeSize(SER_DISK,0)+148)) < nMinRelayTxFee);
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}
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friend bool operator==(const CTxOut& a, const CTxOut& b)
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{
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return (a.nValue == b.nValue &&
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a.scriptPubKey == b.scriptPubKey);
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}
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friend bool operator!=(const CTxOut& a, const CTxOut& b)
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{
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return !(a == b);
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}
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std::string ToString() const;
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void print() const;
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};
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/** The basic transaction that is broadcasted on the network and contained in
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* blocks. A transaction can contain multiple inputs and outputs.
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*/
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class CTransaction
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{
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public:
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static int64_t nMinTxFee;
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static int64_t nMinRelayTxFee;
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static const int CURRENT_VERSION=1;
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int nVersion;
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std::vector<CTxIn> vin;
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std::vector<CTxOut> vout;
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unsigned int nLockTime;
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CTransaction()
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{
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SetNull();
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}
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IMPLEMENT_SERIALIZE
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(
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READWRITE(this->nVersion);
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nVersion = this->nVersion;
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READWRITE(vin);
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READWRITE(vout);
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READWRITE(nLockTime);
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)
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void SetNull()
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{
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nVersion = CTransaction::CURRENT_VERSION;
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vin.clear();
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vout.clear();
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nLockTime = 0;
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}
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bool IsNull() const
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{
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return (vin.empty() && vout.empty());
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}
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uint256 GetHash() const;
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bool IsNewerThan(const CTransaction& old) const;
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bool IsCoinBase() const
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{
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return (vin.size() == 1 && vin[0].prevout.IsNull());
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}
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friend bool operator==(const CTransaction& a, const CTransaction& b)
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{
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return (a.nVersion == b.nVersion &&
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a.vin == b.vin &&
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a.vout == b.vout &&
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a.nLockTime == b.nLockTime);
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}
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friend bool operator!=(const CTransaction& a, const CTransaction& b)
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{
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return !(a == b);
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}
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std::string ToString() const;
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void print() const;
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};
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/** wrapper for CTxOut that provides a more compact serialization */
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class CTxOutCompressor
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{
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private:
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CTxOut &txout;
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public:
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static uint64_t CompressAmount(uint64_t nAmount);
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static uint64_t DecompressAmount(uint64_t nAmount);
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CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
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IMPLEMENT_SERIALIZE(({
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if (!fRead) {
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uint64_t nVal = CompressAmount(txout.nValue);
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READWRITE(VARINT(nVal));
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} else {
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uint64_t nVal = 0;
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READWRITE(VARINT(nVal));
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txout.nValue = DecompressAmount(nVal);
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}
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CScriptCompressor cscript(REF(txout.scriptPubKey));
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READWRITE(cscript);
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});)
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};
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/** Undo information for a CTxIn
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*
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* Contains the prevout's CTxOut being spent, and if this was the
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* last output of the affected transaction, its metadata as well
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* (coinbase or not, height, transaction version)
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*/
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class CTxInUndo
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{
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public:
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CTxOut txout; // the txout data before being spent
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bool fCoinBase; // if the outpoint was the last unspent: whether it belonged to a coinbase
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unsigned int nHeight; // if the outpoint was the last unspent: its height
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int nVersion; // if the outpoint was the last unspent: its version
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CTxInUndo() : txout(), fCoinBase(false), nHeight(0), nVersion(0) {}
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CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { }
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unsigned int GetSerializeSize(int nType, int nVersion) const {
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return ::GetSerializeSize(VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion) +
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(nHeight > 0 ? ::GetSerializeSize(VARINT(this->nVersion), nType, nVersion) : 0) +
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::GetSerializeSize(CTxOutCompressor(REF(txout)), nType, nVersion);
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}
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template<typename Stream>
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void Serialize(Stream &s, int nType, int nVersion) const {
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::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion);
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if (nHeight > 0)
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::Serialize(s, VARINT(this->nVersion), nType, nVersion);
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::Serialize(s, CTxOutCompressor(REF(txout)), nType, nVersion);
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}
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template<typename Stream>
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void Unserialize(Stream &s, int nType, int nVersion) {
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unsigned int nCode = 0;
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::Unserialize(s, VARINT(nCode), nType, nVersion);
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nHeight = nCode / 2;
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fCoinBase = nCode & 1;
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if (nHeight > 0)
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::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
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::Unserialize(s, REF(CTxOutCompressor(REF(txout))), nType, nVersion);
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}
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};
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/** Undo information for a CTransaction */
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class CTxUndo
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{
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public:
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// undo information for all txins
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std::vector<CTxInUndo> vprevout;
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IMPLEMENT_SERIALIZE(
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READWRITE(vprevout);
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)
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};
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/** pruned version of CTransaction: only retains metadata and unspent transaction outputs
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*
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* Serialized format:
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* - VARINT(nVersion)
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* - VARINT(nCode)
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* - unspentness bitvector, for vout[2] and further; least significant byte first
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* - the non-spent CTxOuts (via CTxOutCompressor)
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* - VARINT(nHeight)
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*
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* The nCode value consists of:
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* - bit 1: IsCoinBase()
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* - bit 2: vout[0] is not spent
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* - bit 4: vout[1] is not spent
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* - The higher bits encode N, the number of non-zero bytes in the following bitvector.
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* - In case both bit 2 and bit 4 are unset, they encode N-1, as there must be at
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* least one non-spent output).
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*
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* Example: 0104835800816115944e077fe7c803cfa57f29b36bf87c1d358bb85e
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* <><><--------------------------------------------><---->
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* | \ | /
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* version code vout[1] height
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*
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* - version = 1
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* - code = 4 (vout[1] is not spent, and 0 non-zero bytes of bitvector follow)
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* - unspentness bitvector: as 0 non-zero bytes follow, it has length 0
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* - vout[1]: 835800816115944e077fe7c803cfa57f29b36bf87c1d35
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* * 8358: compact amount representation for 60000000000 (600 BTC)
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* * 00: special txout type pay-to-pubkey-hash
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* * 816115944e077fe7c803cfa57f29b36bf87c1d35: address uint160
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* - height = 203998
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*
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*
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* Example: 0109044086ef97d5790061b01caab50f1b8e9c50a5057eb43c2d9563a4eebbd123008c988f1a4a4de2161e0f50aac7f17e7f9555caa486af3b
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* <><><--><--------------------------------------------------><----------------------------------------------><---->
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* / \ \ | | /
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* version code unspentness vout[4] vout[16] height
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*
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* - version = 1
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* - code = 9 (coinbase, neither vout[0] or vout[1] are unspent,
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* 2 (1, +1 because both bit 2 and bit 4 are unset) non-zero bitvector bytes follow)
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* - unspentness bitvector: bits 2 (0x04) and 14 (0x4000) are set, so vout[2+2] and vout[14+2] are unspent
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* - vout[4]: 86ef97d5790061b01caab50f1b8e9c50a5057eb43c2d9563a4ee
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* * 86ef97d579: compact amount representation for 234925952 (2.35 BTC)
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* * 00: special txout type pay-to-pubkey-hash
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* * 61b01caab50f1b8e9c50a5057eb43c2d9563a4ee: address uint160
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* - vout[16]: bbd123008c988f1a4a4de2161e0f50aac7f17e7f9555caa4
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* * bbd123: compact amount representation for 110397 (0.001 BTC)
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* * 00: special txout type pay-to-pubkey-hash
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* * 8c988f1a4a4de2161e0f50aac7f17e7f9555caa4: address uint160
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* - height = 120891
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*/
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class CCoins
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{
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public:
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// whether transaction is a coinbase
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bool fCoinBase;
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// unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped
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std::vector<CTxOut> vout;
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// at which height this transaction was included in the active block chain
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int nHeight;
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// version of the CTransaction; accesses to this value should probably check for nHeight as well,
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// as new tx version will probably only be introduced at certain heights
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int nVersion;
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// construct a CCoins from a CTransaction, at a given height
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CCoins(const CTransaction &tx, int nHeightIn) : fCoinBase(tx.IsCoinBase()), vout(tx.vout), nHeight(nHeightIn), nVersion(tx.nVersion) {
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ClearUnspendable();
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}
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// empty constructor
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CCoins() : fCoinBase(false), vout(0), nHeight(0), nVersion(0) { }
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// remove spent outputs at the end of vout
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void Cleanup() {
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while (vout.size() > 0 && vout.back().IsNull())
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vout.pop_back();
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if (vout.empty())
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std::vector<CTxOut>().swap(vout);
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}
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void ClearUnspendable() {
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BOOST_FOREACH(CTxOut &txout, vout) {
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if (txout.scriptPubKey.IsUnspendable())
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txout.SetNull();
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}
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Cleanup();
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}
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void swap(CCoins &to) {
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std::swap(to.fCoinBase, fCoinBase);
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to.vout.swap(vout);
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std::swap(to.nHeight, nHeight);
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std::swap(to.nVersion, nVersion);
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}
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// equality test
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friend bool operator==(const CCoins &a, const CCoins &b) {
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// Empty CCoins objects are always equal.
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if (a.IsPruned() && b.IsPruned())
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return true;
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return a.fCoinBase == b.fCoinBase &&
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a.nHeight == b.nHeight &&
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a.nVersion == b.nVersion &&
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a.vout == b.vout;
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}
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friend bool operator!=(const CCoins &a, const CCoins &b) {
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return !(a == b);
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}
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void CalcMaskSize(unsigned int &nBytes, unsigned int &nNonzeroBytes) const;
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bool IsCoinBase() const {
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return fCoinBase;
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}
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unsigned int GetSerializeSize(int nType, int nVersion) const {
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unsigned int nSize = 0;
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unsigned int nMaskSize = 0, nMaskCode = 0;
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CalcMaskSize(nMaskSize, nMaskCode);
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bool fFirst = vout.size() > 0 && !vout[0].IsNull();
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bool fSecond = vout.size() > 1 && !vout[1].IsNull();
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assert(fFirst || fSecond || nMaskCode);
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unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0);
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// version
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nSize += ::GetSerializeSize(VARINT(this->nVersion), nType, nVersion);
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// size of header code
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nSize += ::GetSerializeSize(VARINT(nCode), nType, nVersion);
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// spentness bitmask
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nSize += nMaskSize;
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// txouts themself
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for (unsigned int i = 0; i < vout.size(); i++)
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if (!vout[i].IsNull())
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nSize += ::GetSerializeSize(CTxOutCompressor(REF(vout[i])), nType, nVersion);
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// height
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nSize += ::GetSerializeSize(VARINT(nHeight), nType, nVersion);
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return nSize;
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}
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template<typename Stream>
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void Serialize(Stream &s, int nType, int nVersion) const {
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unsigned int nMaskSize = 0, nMaskCode = 0;
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CalcMaskSize(nMaskSize, nMaskCode);
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bool fFirst = vout.size() > 0 && !vout[0].IsNull();
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bool fSecond = vout.size() > 1 && !vout[1].IsNull();
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assert(fFirst || fSecond || nMaskCode);
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unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0);
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// version
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::Serialize(s, VARINT(this->nVersion), nType, nVersion);
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// header code
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::Serialize(s, VARINT(nCode), nType, nVersion);
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// spentness bitmask
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for (unsigned int b = 0; b<nMaskSize; b++) {
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unsigned char chAvail = 0;
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for (unsigned int i = 0; i < 8 && 2+b*8+i < vout.size(); i++)
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if (!vout[2+b*8+i].IsNull())
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chAvail |= (1 << i);
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::Serialize(s, chAvail, nType, nVersion);
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}
|
|
// txouts themself
|
|
for (unsigned int i = 0; i < vout.size(); i++) {
|
|
if (!vout[i].IsNull())
|
|
::Serialize(s, CTxOutCompressor(REF(vout[i])), nType, nVersion);
|
|
}
|
|
// coinbase height
|
|
::Serialize(s, VARINT(nHeight), nType, nVersion);
|
|
}
|
|
|
|
template<typename Stream>
|
|
void Unserialize(Stream &s, int nType, int nVersion) {
|
|
unsigned int nCode = 0;
|
|
// version
|
|
::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
|
|
// header code
|
|
::Unserialize(s, VARINT(nCode), nType, nVersion);
|
|
fCoinBase = nCode & 1;
|
|
std::vector<bool> vAvail(2, false);
|
|
vAvail[0] = nCode & 2;
|
|
vAvail[1] = nCode & 4;
|
|
unsigned int nMaskCode = (nCode / 8) + ((nCode & 6) != 0 ? 0 : 1);
|
|
// spentness bitmask
|
|
while (nMaskCode > 0) {
|
|
unsigned char chAvail = 0;
|
|
::Unserialize(s, chAvail, nType, nVersion);
|
|
for (unsigned int p = 0; p < 8; p++) {
|
|
bool f = (chAvail & (1 << p)) != 0;
|
|
vAvail.push_back(f);
|
|
}
|
|
if (chAvail != 0)
|
|
nMaskCode--;
|
|
}
|
|
// txouts themself
|
|
vout.assign(vAvail.size(), CTxOut());
|
|
for (unsigned int i = 0; i < vAvail.size(); i++) {
|
|
if (vAvail[i])
|
|
::Unserialize(s, REF(CTxOutCompressor(vout[i])), nType, nVersion);
|
|
}
|
|
// coinbase height
|
|
::Unserialize(s, VARINT(nHeight), nType, nVersion);
|
|
Cleanup();
|
|
}
|
|
|
|
// mark an outpoint spent, and construct undo information
|
|
bool Spend(const COutPoint &out, CTxInUndo &undo);
|
|
|
|
// mark a vout spent
|
|
bool Spend(int nPos);
|
|
|
|
// check whether a particular output is still available
|
|
bool IsAvailable(unsigned int nPos) const {
|
|
return (nPos < vout.size() && !vout[nPos].IsNull());
|
|
}
|
|
|
|
// check whether the entire CCoins is spent
|
|
// note that only !IsPruned() CCoins can be serialized
|
|
bool IsPruned() const {
|
|
BOOST_FOREACH(const CTxOut &out, vout)
|
|
if (!out.IsNull())
|
|
return false;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
|
|
/** Nodes collect new transactions into a block, hash them into a hash tree,
|
|
* and scan through nonce values to make the block's hash satisfy proof-of-work
|
|
* requirements. When they solve the proof-of-work, they broadcast the block
|
|
* to everyone and the block is added to the block chain. The first transaction
|
|
* in the block is a special one that creates a new coin owned by the creator
|
|
* of the block.
|
|
*/
|
|
class CBlockHeader
|
|
{
|
|
public:
|
|
// header
|
|
static const int CURRENT_VERSION=2;
|
|
int nVersion;
|
|
uint256 hashPrevBlock;
|
|
uint256 hashMerkleRoot;
|
|
unsigned int nTime;
|
|
unsigned int nBits;
|
|
unsigned int nNonce;
|
|
|
|
CBlockHeader()
|
|
{
|
|
SetNull();
|
|
}
|
|
|
|
IMPLEMENT_SERIALIZE
|
|
(
|
|
READWRITE(this->nVersion);
|
|
nVersion = this->nVersion;
|
|
READWRITE(hashPrevBlock);
|
|
READWRITE(hashMerkleRoot);
|
|
READWRITE(nTime);
|
|
READWRITE(nBits);
|
|
READWRITE(nNonce);
|
|
)
|
|
|
|
void SetNull()
|
|
{
|
|
nVersion = CBlockHeader::CURRENT_VERSION;
|
|
hashPrevBlock = 0;
|
|
hashMerkleRoot = 0;
|
|
nTime = 0;
|
|
nBits = 0;
|
|
nNonce = 0;
|
|
}
|
|
|
|
bool IsNull() const
|
|
{
|
|
return (nBits == 0);
|
|
}
|
|
|
|
uint256 GetHash() const;
|
|
|
|
int64_t GetBlockTime() const
|
|
{
|
|
return (int64_t)nTime;
|
|
}
|
|
};
|
|
|
|
|
|
class CBlock : public CBlockHeader
|
|
{
|
|
public:
|
|
// network and disk
|
|
std::vector<CTransaction> vtx;
|
|
|
|
// memory only
|
|
mutable std::vector<uint256> vMerkleTree;
|
|
|
|
CBlock()
|
|
{
|
|
SetNull();
|
|
}
|
|
|
|
CBlock(const CBlockHeader &header)
|
|
{
|
|
SetNull();
|
|
*((CBlockHeader*)this) = header;
|
|
}
|
|
|
|
IMPLEMENT_SERIALIZE
|
|
(
|
|
READWRITE(*(CBlockHeader*)this);
|
|
READWRITE(vtx);
|
|
)
|
|
|
|
void SetNull()
|
|
{
|
|
CBlockHeader::SetNull();
|
|
vtx.clear();
|
|
vMerkleTree.clear();
|
|
}
|
|
|
|
CBlockHeader GetBlockHeader() const
|
|
{
|
|
CBlockHeader block;
|
|
block.nVersion = nVersion;
|
|
block.hashPrevBlock = hashPrevBlock;
|
|
block.hashMerkleRoot = hashMerkleRoot;
|
|
block.nTime = nTime;
|
|
block.nBits = nBits;
|
|
block.nNonce = nNonce;
|
|
return block;
|
|
}
|
|
|
|
uint256 BuildMerkleTree() const;
|
|
|
|
const uint256 &GetTxHash(unsigned int nIndex) const {
|
|
assert(vMerkleTree.size() > 0); // BuildMerkleTree must have been called first
|
|
assert(nIndex < vtx.size());
|
|
return vMerkleTree[nIndex];
|
|
}
|
|
|
|
std::vector<uint256> GetMerkleBranch(int nIndex) const;
|
|
static uint256 CheckMerkleBranch(uint256 hash, const std::vector<uint256>& vMerkleBranch, int nIndex);
|
|
void print() const;
|
|
};
|
|
|
|
|
|
/** Describes a place in the block chain to another node such that if the
|
|
* other node doesn't have the same branch, it can find a recent common trunk.
|
|
* The further back it is, the further before the fork it may be.
|
|
*/
|
|
struct CBlockLocator
|
|
{
|
|
std::vector<uint256> vHave;
|
|
|
|
CBlockLocator() {}
|
|
|
|
CBlockLocator(const std::vector<uint256>& vHaveIn)
|
|
{
|
|
vHave = vHaveIn;
|
|
}
|
|
|
|
IMPLEMENT_SERIALIZE
|
|
(
|
|
if (!(nType & SER_GETHASH))
|
|
READWRITE(nVersion);
|
|
READWRITE(vHave);
|
|
)
|
|
|
|
void SetNull()
|
|
{
|
|
vHave.clear();
|
|
}
|
|
|
|
bool IsNull()
|
|
{
|
|
return vHave.empty();
|
|
}
|
|
};
|
|
|
|
#endif
|
|
|