diff options
Diffstat (limited to 'src/main.h')
| -rw-r--r-- | src/main.h | 868 |
1 files changed, 76 insertions, 792 deletions
diff --git a/src/main.h b/src/main.h index fae37ea512..f20fad98a4 100644 --- a/src/main.h +++ b/src/main.h @@ -5,6 +5,7 @@ #ifndef BITCOIN_MAIN_H #define BITCOIN_MAIN_H +#include "core.h" #include "bignum.h" #include "sync.h" #include "net.h" @@ -34,8 +35,6 @@ static const unsigned int MAX_STANDARD_TX_SIZE = MAX_BLOCK_SIZE_GEN/5; static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50; /** The maximum number of orphan transactions kept in memory */ static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100; -/** The maximum number of entries in an 'inv' protocol message */ -static const unsigned int MAX_INV_SZ = 50000; /** The maximum size of a blk?????.dat file (since 0.8) */ static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB /** The pre-allocation chunk size for blk?????.dat files (since 0.8) */ @@ -122,6 +121,14 @@ void RegisterWallet(CWallet* pwalletIn); void UnregisterWallet(CWallet* pwalletIn); /** Push an updated transaction to all registered wallets */ void SyncWithWallets(const uint256 &hash, const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false); + +/** Register with a network node to receive its signals */ +void RegisterNodeSignals(CNodeSignals& nodeSignals); +/** Unregister a network node */ +void UnregisterNodeSignals(CNodeSignals& nodeSignals); + +void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd); + /** Process an incoming block */ bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp = NULL); /** Check whether enough disk space is available for an incoming block */ @@ -176,6 +183,9 @@ bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock, b bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew); /** Find the best known block, and make it the tip of the block chain */ bool ConnectBestBlock(CValidationState &state); + +void UpdateTime(CBlockHeader& block, const CBlockIndex* pindexPrev); + /** Create a new block index entry for a given block hash */ CBlockIndex * InsertBlockIndex(uint256 hash); /** Verify a signature */ @@ -249,210 +259,6 @@ struct CDiskTxPos : public CDiskBlockPos }; -/** An inpoint - a combination of a transaction and an index n into its vin */ -class CInPoint -{ -public: - CTransaction* ptx; - unsigned int n; - - CInPoint() { SetNull(); } - CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; } - void SetNull() { ptx = NULL; n = (unsigned int) -1; } - bool IsNull() const { return (ptx == NULL && n == (unsigned int) -1); } -}; - - - -/** An outpoint - a combination of a transaction hash and an index n into its vout */ -class COutPoint -{ -public: - uint256 hash; - unsigned int n; - - COutPoint() { SetNull(); } - COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; } - IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); ) - void SetNull() { hash = 0; n = (unsigned int) -1; } - bool IsNull() const { return (hash == 0 && n == (unsigned int) -1); } - - friend bool operator<(const COutPoint& a, const COutPoint& b) - { - return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n)); - } - - friend bool operator==(const COutPoint& a, const COutPoint& b) - { - return (a.hash == b.hash && a.n == b.n); - } - - friend bool operator!=(const COutPoint& a, const COutPoint& b) - { - return !(a == b); - } - - std::string ToString() const - { - return strprintf("COutPoint(%s, %u)", hash.ToString().c_str(), n); - } - - void print() const - { - printf("%s\n", ToString().c_str()); - } -}; - - - - -/** An input of a transaction. It contains the location of the previous - * transaction's output that it claims and a signature that matches the - * output's public key. - */ -class CTxIn -{ -public: - COutPoint prevout; - CScript scriptSig; - unsigned int nSequence; - - CTxIn() - { - nSequence = std::numeric_limits<unsigned int>::max(); - } - - explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max()) - { - prevout = prevoutIn; - scriptSig = scriptSigIn; - nSequence = nSequenceIn; - } - - CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max()) - { - prevout = COutPoint(hashPrevTx, nOut); - scriptSig = scriptSigIn; - nSequence = nSequenceIn; - } - - IMPLEMENT_SERIALIZE - ( - READWRITE(prevout); - READWRITE(scriptSig); - READWRITE(nSequence); - ) - - bool IsFinal() const - { - return (nSequence == std::numeric_limits<unsigned int>::max()); - } - - friend bool operator==(const CTxIn& a, const CTxIn& b) - { - return (a.prevout == b.prevout && - a.scriptSig == b.scriptSig && - a.nSequence == b.nSequence); - } - - friend bool operator!=(const CTxIn& a, const CTxIn& b) - { - return !(a == b); - } - - std::string ToString() const - { - std::string str; - str += "CTxIn("; - str += prevout.ToString(); - if (prevout.IsNull()) - str += strprintf(", coinbase %s", HexStr(scriptSig).c_str()); - else - str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str()); - if (nSequence != std::numeric_limits<unsigned int>::max()) - str += strprintf(", nSequence=%u", nSequence); - str += ")"; - return str; - } - - void print() const - { - printf("%s\n", ToString().c_str()); - } -}; - - - - -/** An output of a transaction. It contains the public key that the next input - * must be able to sign with to claim it. - */ -class CTxOut -{ -public: - int64 nValue; - CScript scriptPubKey; - - CTxOut() - { - SetNull(); - } - - CTxOut(int64 nValueIn, CScript scriptPubKeyIn) - { - nValue = nValueIn; - scriptPubKey = scriptPubKeyIn; - } - - IMPLEMENT_SERIALIZE - ( - READWRITE(nValue); - READWRITE(scriptPubKey); - ) - - void SetNull() - { - nValue = -1; - scriptPubKey.clear(); - } - - bool IsNull() const - { - return (nValue == -1); - } - - uint256 GetHash() const - { - return SerializeHash(*this); - } - - friend bool operator==(const CTxOut& a, const CTxOut& b) - { - return (a.nValue == b.nValue && - a.scriptPubKey == b.scriptPubKey); - } - - friend bool operator!=(const CTxOut& a, const CTxOut& b) - { - return !(a == b); - } - - bool IsDust() const; - - std::string ToString() const - { - if (scriptPubKey.size() < 6) - return "CTxOut(error)"; - return strprintf("CTxOut(nValue=%"PRI64d".%08"PRI64d", scriptPubKey=%s)", nValue / COIN, nValue % COIN, scriptPubKey.ToString().substr(0,30).c_str()); - } - - void print() const - { - printf("%s\n", ToString().c_str()); - } -}; - - enum GetMinFee_mode { @@ -461,298 +267,72 @@ enum GetMinFee_mode GMF_SEND, }; -/** The basic transaction that is broadcasted on the network and contained in - * blocks. A transaction can contain multiple inputs and outputs. - */ -class CTransaction -{ -public: - static int64 nMinTxFee; - static int64 nMinRelayTxFee; - static const int CURRENT_VERSION=1; - int nVersion; - std::vector<CTxIn> vin; - std::vector<CTxOut> vout; - unsigned int nLockTime; - - CTransaction() - { - SetNull(); - } - - IMPLEMENT_SERIALIZE - ( - READWRITE(this->nVersion); - nVersion = this->nVersion; - READWRITE(vin); - READWRITE(vout); - READWRITE(nLockTime); - ) - - void SetNull() - { - nVersion = CTransaction::CURRENT_VERSION; - vin.clear(); - vout.clear(); - nLockTime = 0; - } - - bool IsNull() const - { - return (vin.empty() && vout.empty()); - } - - uint256 GetHash() const - { - return SerializeHash(*this); - } - - bool IsFinal(int nBlockHeight=0, int64 nBlockTime=0) const - { - // Time based nLockTime implemented in 0.1.6 - if (nLockTime == 0) - return true; - if (nBlockHeight == 0) - nBlockHeight = nBestHeight; - if (nBlockTime == 0) - nBlockTime = GetAdjustedTime(); - if ((int64)nLockTime < ((int64)nLockTime < LOCKTIME_THRESHOLD ? (int64)nBlockHeight : nBlockTime)) - return true; - BOOST_FOREACH(const CTxIn& txin, vin) - if (!txin.IsFinal()) - return false; - return true; - } - - bool IsNewerThan(const CTransaction& old) const - { - if (vin.size() != old.vin.size()) - return false; - for (unsigned int i = 0; i < vin.size(); i++) - if (vin[i].prevout != old.vin[i].prevout) - return false; - - bool fNewer = false; - unsigned int nLowest = std::numeric_limits<unsigned int>::max(); - for (unsigned int i = 0; i < vin.size(); i++) - { - if (vin[i].nSequence != old.vin[i].nSequence) - { - if (vin[i].nSequence <= nLowest) - { - fNewer = false; - nLowest = vin[i].nSequence; - } - if (old.vin[i].nSequence < nLowest) - { - fNewer = true; - nLowest = old.vin[i].nSequence; - } - } - } - return fNewer; - } - - bool IsCoinBase() const - { - return (vin.size() == 1 && vin[0].prevout.IsNull()); - } +int64 GetMinFee(const CTransaction& tx, unsigned int nBlockSize = 1, bool fAllowFree = true, enum GetMinFee_mode mode = GMF_BLOCK); - /** Check for standard transaction types - @return True if all outputs (scriptPubKeys) use only standard transaction forms - */ - bool IsStandard() const; +// +// Check transaction inputs, and make sure any +// pay-to-script-hash transactions are evaluating IsStandard scripts +// +// Why bother? To avoid denial-of-service attacks; an attacker +// can submit a standard HASH... OP_EQUAL transaction, +// which will get accepted into blocks. The redemption +// script can be anything; an attacker could use a very +// expensive-to-check-upon-redemption script like: +// DUP CHECKSIG DROP ... repeated 100 times... OP_1 +// /** Check for standard transaction types - @param[in] mapInputs Map of previous transactions that have outputs we're spending + @param[in] mapInputs Map of previous transactions that have outputs we're spending @return True if all inputs (scriptSigs) use only standard transaction forms */ - bool AreInputsStandard(CCoinsViewCache& mapInputs) const; +bool AreInputsStandard(const CTransaction& tx, CCoinsViewCache& mapInputs); - /** Count ECDSA signature operations the old-fashioned (pre-0.6) way - @return number of sigops this transaction's outputs will produce when spent - */ - unsigned int GetLegacySigOpCount() const; +/** Count ECDSA signature operations the old-fashioned (pre-0.6) way + @return number of sigops this transaction's outputs will produce when spent + @see CTransaction::FetchInputs +*/ +unsigned int GetLegacySigOpCount(const CTransaction& tx); - /** Count ECDSA signature operations in pay-to-script-hash inputs. +/** Count ECDSA signature operations in pay-to-script-hash inputs. - @param[in] mapInputs Map of previous transactions that have outputs we're spending - @return maximum number of sigops required to validate this transaction's inputs - */ - unsigned int GetP2SHSigOpCount(CCoinsViewCache& mapInputs) const; - - /** Amount of bitcoins spent by this transaction. - @return sum of all outputs (note: does not include fees) - */ - int64 GetValueOut() const - { - int64 nValueOut = 0; - BOOST_FOREACH(const CTxOut& txout, vout) - { - nValueOut += txout.nValue; - if (!MoneyRange(txout.nValue) || !MoneyRange(nValueOut)) - throw std::runtime_error("CTransaction::GetValueOut() : value out of range"); - } - return nValueOut; - } - - /** Amount of bitcoins coming in to this transaction - Note that lightweight clients may not know anything besides the hash of previous transactions, - so may not be able to calculate this. - - @param[in] mapInputs Map of previous transactions that have outputs we're spending - @return Sum of value of all inputs (scriptSigs) - */ - int64 GetValueIn(CCoinsViewCache& mapInputs) const; - - static bool AllowFree(double dPriority) - { - // Large (in bytes) low-priority (new, small-coin) transactions - // need a fee. - return dPriority > COIN * 144 / 250; - } - - int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true, enum GetMinFee_mode mode=GMF_BLOCK) const; - - friend bool operator==(const CTransaction& a, const CTransaction& b) - { - return (a.nVersion == b.nVersion && - a.vin == b.vin && - a.vout == b.vout && - a.nLockTime == b.nLockTime); - } - - friend bool operator!=(const CTransaction& a, const CTransaction& b) - { - return !(a == b); - } - - - std::string ToString() const - { - std::string str; - str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%"PRIszu", vout.size=%"PRIszu", nLockTime=%u)\n", - GetHash().ToString().c_str(), - 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 < vout.size(); i++) - str += " " + vout[i].ToString() + "\n"; - return str; - } - - void print() const - { - printf("%s", ToString().c_str()); - } - - - // Check whether all prevouts of this transaction are present in the UTXO set represented by view - bool HaveInputs(CCoinsViewCache &view) const; - - // Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts) - // This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it - // instead of being performed inline. - bool CheckInputs(CValidationState &state, CCoinsViewCache &view, bool fScriptChecks = true, - unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, - std::vector<CScriptCheck> *pvChecks = NULL) const; - - // Apply the effects of this transaction on the UTXO set represented by view - void UpdateCoins(CValidationState &state, CCoinsViewCache &view, CTxUndo &txundo, int nHeight, const uint256 &txhash) const; - - // Context-independent validity checks - bool CheckTransaction(CValidationState &state) const; - - // Try to accept this transaction into the memory pool - bool AcceptToMemoryPool(CValidationState &state, bool fCheckInputs=true, bool fLimitFree = true, bool* pfMissingInputs=NULL); + @param[in] mapInputs Map of previous transactions that have outputs we're spending + @return maximum number of sigops required to validate this transaction's inputs + @see CTransaction::FetchInputs + */ +unsigned int GetP2SHSigOpCount(const CTransaction& tx, CCoinsViewCache& mapInputs); -protected: - static const CTxOut &GetOutputFor(const CTxIn& input, CCoinsViewCache& mapInputs); -}; -/** wrapper for CTxOut that provides a more compact serialization */ -class CTxOutCompressor +inline bool AllowFree(double dPriority) { -private: - CTxOut &txout; + // Large (in bytes) low-priority (new, small-coin) transactions + // need a fee. + return dPriority > COIN * 144 / 250; +} -public: - static uint64 CompressAmount(uint64 nAmount); - static uint64 DecompressAmount(uint64 nAmount); +// Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts) +// This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it +// instead of being performed inline. +bool CheckInputs(const CTransaction& tx, CValidationState &state, CCoinsViewCache &view, bool fScriptChecks = true, + unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, + std::vector<CScriptCheck> *pvChecks = NULL); - CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { } +// Apply the effects of this transaction on the UTXO set represented by view +bool UpdateCoins(const CTransaction& tx, CCoinsViewCache &view, CTxUndo &txundo, int nHeight, const uint256 &txhash); - IMPLEMENT_SERIALIZE(({ - if (!fRead) { - uint64 nVal = CompressAmount(txout.nValue); - READWRITE(VARINT(nVal)); - } else { - uint64 nVal = 0; - READWRITE(VARINT(nVal)); - txout.nValue = DecompressAmount(nVal); - } - CScriptCompressor cscript(REF(txout.scriptPubKey)); - READWRITE(cscript); - });) -}; +// Context-independent validity checks +bool CheckTransaction(const CTransaction& tx, CValidationState& state); -/** Undo information for a CTxIn - * - * Contains the prevout's CTxOut being spent, and if this was the - * last output of the affected transaction, its metadata as well - * (coinbase or not, height, transaction version) - */ -class CTxInUndo -{ -public: - CTxOut txout; // the txout data before being spent - bool fCoinBase; // if the outpoint was the last unspent: whether it belonged to a coinbase - unsigned int nHeight; // if the outpoint was the last unspent: its height - int nVersion; // if the outpoint was the last unspent: its version - - CTxInUndo() : txout(), fCoinBase(false), nHeight(0), nVersion(0) {} - CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { } - - unsigned int GetSerializeSize(int nType, int nVersion) const { - return ::GetSerializeSize(VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion) + - (nHeight > 0 ? ::GetSerializeSize(VARINT(this->nVersion), nType, nVersion) : 0) + - ::GetSerializeSize(CTxOutCompressor(REF(txout)), nType, nVersion); - } - - template<typename Stream> - void Serialize(Stream &s, int nType, int nVersion) const { - ::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion); - if (nHeight > 0) - ::Serialize(s, VARINT(this->nVersion), nType, nVersion); - ::Serialize(s, CTxOutCompressor(REF(txout)), nType, nVersion); - } - - template<typename Stream> - void Unserialize(Stream &s, int nType, int nVersion) { - unsigned int nCode = 0; - ::Unserialize(s, VARINT(nCode), nType, nVersion); - nHeight = nCode / 2; - fCoinBase = nCode & 1; - if (nHeight > 0) - ::Unserialize(s, VARINT(this->nVersion), nType, nVersion); - ::Unserialize(s, REF(CTxOutCompressor(REF(txout))), nType, nVersion); - } -}; +/** Check for standard transaction types + @return True if all outputs (scriptPubKeys) use only standard transaction forms +*/ +bool IsStandardTx(const CTransaction& tx); -/** Undo information for a CTransaction */ -class CTxUndo -{ -public: - // undo information for all txins - std::vector<CTxInUndo> vprevout; +bool IsFinalTx(const CTransaction &tx, int nBlockHeight = 0, int64 nBlockTime = 0); - IMPLEMENT_SERIALIZE( - READWRITE(vprevout); - ) -}; +/** Amount of bitcoins spent by the transaction. + @return sum of all outputs (note: does not include fees) + */ +int64 GetValueOut(const CTransaction& tx); /** Undo information for a CBlock */ class CBlockUndo @@ -824,254 +404,6 @@ public: } }; -/** pruned version of CTransaction: only retains metadata and unspent transaction outputs - * - * Serialized format: - * - VARINT(nVersion) - * - VARINT(nCode) - * - unspentness bitvector, for vout[2] and further; least significant byte first - * - the non-spent CTxOuts (via CTxOutCompressor) - * - VARINT(nHeight) - * - * The nCode value consists of: - * - bit 1: IsCoinBase() - * - bit 2: vout[0] is not spent - * - bit 4: vout[1] is not spent - * - The higher bits encode N, the number of non-zero bytes in the following bitvector. - * - In case both bit 2 and bit 4 are unset, they encode N-1, as there must be at - * least one non-spent output). - * - * Example: 0104835800816115944e077fe7c803cfa57f29b36bf87c1d358bb85e - * <><><--------------------------------------------><----> - * | \ | / - * version code vout[1] height - * - * - version = 1 - * - code = 4 (vout[1] is not spent, and 0 non-zero bytes of bitvector follow) - * - unspentness bitvector: as 0 non-zero bytes follow, it has length 0 - * - vout[1]: 835800816115944e077fe7c803cfa57f29b36bf87c1d35 - * * 8358: compact amount representation for 60000000000 (600 BTC) - * * 00: special txout type pay-to-pubkey-hash - * * 816115944e077fe7c803cfa57f29b36bf87c1d35: address uint160 - * - height = 203998 - * - * - * Example: 0109044086ef97d5790061b01caab50f1b8e9c50a5057eb43c2d9563a4eebbd123008c988f1a4a4de2161e0f50aac7f17e7f9555caa486af3b - * <><><--><--------------------------------------------------><----------------------------------------------><----> - * / \ \ | | / - * version code unspentness vout[4] vout[16] height - * - * - version = 1 - * - code = 9 (coinbase, neither vout[0] or vout[1] are unspent, - * 2 (1, +1 because both bit 2 and bit 4 are unset) non-zero bitvector bytes follow) - * - unspentness bitvector: bits 2 (0x04) and 14 (0x4000) are set, so vout[2+2] and vout[14+2] are unspent - * - vout[4]: 86ef97d5790061b01caab50f1b8e9c50a5057eb43c2d9563a4ee - * * 86ef97d579: compact amount representation for 234925952 (2.35 BTC) - * * 00: special txout type pay-to-pubkey-hash - * * 61b01caab50f1b8e9c50a5057eb43c2d9563a4ee: address uint160 - * - vout[16]: bbd123008c988f1a4a4de2161e0f50aac7f17e7f9555caa4 - * * bbd123: compact amount representation for 110397 (0.001 BTC) - * * 00: special txout type pay-to-pubkey-hash - * * 8c988f1a4a4de2161e0f50aac7f17e7f9555caa4: address uint160 - * - height = 120891 - */ -class CCoins -{ -public: - // whether transaction is a coinbase - bool fCoinBase; - - // unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped - std::vector<CTxOut> vout; - - // at which height this transaction was included in the active block chain - int nHeight; - - // version of the CTransaction; accesses to this value should probably check for nHeight as well, - // as new tx version will probably only be introduced at certain heights - int nVersion; - - // construct a CCoins from a CTransaction, at a given height - CCoins(const CTransaction &tx, int nHeightIn) : fCoinBase(tx.IsCoinBase()), vout(tx.vout), nHeight(nHeightIn), nVersion(tx.nVersion) { } - - // empty constructor - CCoins() : fCoinBase(false), vout(0), nHeight(0), nVersion(0) { } - - // remove spent outputs at the end of vout - void Cleanup() { - while (vout.size() > 0 && vout.back().IsNull()) - vout.pop_back(); - if (vout.empty()) - std::vector<CTxOut>().swap(vout); - } - - void swap(CCoins &to) { - std::swap(to.fCoinBase, fCoinBase); - to.vout.swap(vout); - std::swap(to.nHeight, nHeight); - std::swap(to.nVersion, nVersion); - } - - // equality test - friend bool operator==(const CCoins &a, const CCoins &b) { - return a.fCoinBase == b.fCoinBase && - a.nHeight == b.nHeight && - a.nVersion == b.nVersion && - a.vout == b.vout; - } - friend bool operator!=(const CCoins &a, const CCoins &b) { - return !(a == b); - } - - // calculate number of bytes for the bitmask, and its number of non-zero bytes - // each bit in the bitmask represents the availability of one output, but the - // availabilities of the first two outputs are encoded separately - void CalcMaskSize(unsigned int &nBytes, unsigned int &nNonzeroBytes) const { - unsigned int nLastUsedByte = 0; - for (unsigned int b = 0; 2+b*8 < vout.size(); b++) { - bool fZero = true; - for (unsigned int i = 0; i < 8 && 2+b*8+i < vout.size(); i++) { - if (!vout[2+b*8+i].IsNull()) { - fZero = false; - continue; - } - } - if (!fZero) { - nLastUsedByte = b + 1; - nNonzeroBytes++; - } - } - nBytes += nLastUsedByte; - } - - bool IsCoinBase() const { - return fCoinBase; - } - - unsigned int GetSerializeSize(int nType, int nVersion) const { - unsigned int nSize = 0; - unsigned int nMaskSize = 0, nMaskCode = 0; - CalcMaskSize(nMaskSize, nMaskCode); - bool fFirst = vout.size() > 0 && !vout[0].IsNull(); - bool fSecond = vout.size() > 1 && !vout[1].IsNull(); - assert(fFirst || fSecond || nMaskCode); - unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0); - // version - nSize += ::GetSerializeSize(VARINT(this->nVersion), nType, nVersion); - // size of header code - nSize += ::GetSerializeSize(VARINT(nCode), nType, nVersion); - // spentness bitmask - nSize += nMaskSize; - // txouts themself - for (unsigned int i = 0; i < vout.size(); i++) - if (!vout[i].IsNull()) - nSize += ::GetSerializeSize(CTxOutCompressor(REF(vout[i])), nType, nVersion); - // height - nSize += ::GetSerializeSize(VARINT(nHeight), nType, nVersion); - return nSize; - } - - template<typename Stream> - void Serialize(Stream &s, int nType, int nVersion) const { - unsigned int nMaskSize = 0, nMaskCode = 0; - CalcMaskSize(nMaskSize, nMaskCode); - bool fFirst = vout.size() > 0 && !vout[0].IsNull(); - bool fSecond = vout.size() > 1 && !vout[1].IsNull(); - assert(fFirst || fSecond || nMaskCode); - unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0); - // version - ::Serialize(s, VARINT(this->nVersion), nType, nVersion); - // header code - ::Serialize(s, VARINT(nCode), nType, nVersion); - // spentness bitmask - for (unsigned int b = 0; b<nMaskSize; b++) { - unsigned char chAvail = 0; - for (unsigned int i = 0; i < 8 && 2+b*8+i < vout.size(); i++) - if (!vout[2+b*8+i].IsNull()) - chAvail |= (1 << i); - ::Serialize(s, chAvail, nType, nVersion); - } - // 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) { - if (out.n >= vout.size()) - return false; - if (vout[out.n].IsNull()) - return false; - undo = CTxInUndo(vout[out.n]); - vout[out.n].SetNull(); - Cleanup(); - if (vout.size() == 0) { - undo.nHeight = nHeight; - undo.fCoinBase = fCoinBase; - undo.nVersion = this->nVersion; - } - return true; - } - - // mark a vout spent - bool Spend(int nPos) { - CTxInUndo undo; - COutPoint out(0, nPos); - return Spend(out, undo); - } - - // 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; - } -}; /** Closure representing one script verification * Note that this stores references to the spending transaction */ @@ -1250,69 +582,6 @@ public: }; -/** 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 - { - return Hash(BEGIN(nVersion), END(nNonce)); - } - - int64 GetBlockTime() const - { - return (int64)nTime; - } - - void UpdateTime(const CBlockIndex* pindexPrev); -}; - class CBlock : public CBlockHeader { public: @@ -2183,6 +1452,21 @@ public: // Calculate the size of the cache (in number of transactions) unsigned int GetCacheSize(); + /** Amount of bitcoins coming in to a transaction + Note that lightweight clients may not know anything besides the hash of previous transactions, + so may not be able to calculate this. + + @param[in] tx transaction for which we are checking input total + @return Sum of value of all inputs (scriptSigs) + @see CTransaction::FetchInputs + */ + int64 GetValueIn(const CTransaction& tx); + + // Check whether all prevouts of the transaction are present in the UTXO set represented by this view + bool HaveInputs(const CTransaction& tx); + + const CTxOut &GetOutputFor(const CTxIn& input); + private: std::map<uint256,CCoins>::iterator FetchCoins(const uint256 &txid); }; |