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Moved CCoins, CTxOutCompressor, CTxInUndo, and CTxUndo to core.

pull/1/head
Eric Lombrozo 10 years ago
parent
commit
65e7bbef74
  1. 332
      src/core.h
  2. 330
      src/main.h

332
src/core.h

@ -340,4 +340,336 @@ public: @@ -340,4 +340,336 @@ public:
}
};
/** wrapper for CTxOut that provides a more compact serialization */
class CTxOutCompressor
{
private:
CTxOut &txout;
public:
static uint64 CompressAmount(uint64 nAmount);
static uint64 DecompressAmount(uint64 nAmount);
CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
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);
});)
};
/** 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);
}
};
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
std::vector<CTxInUndo> vprevout;
IMPLEMENT_SERIALIZE(
READWRITE(vprevout);
)
};
/** 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;
}
};
#endif

330
src/main.h

@ -328,88 +328,6 @@ bool IsFinalTx(const CTransaction &tx, int nBlockHeight = 0, int64 nBlockTime = @@ -328,88 +328,6 @@ bool IsFinalTx(const CTransaction &tx, int nBlockHeight = 0, int64 nBlockTime =
*/
int64 GetValueOut(const CTransaction& tx);
/** wrapper for CTxOut that provides a more compact serialization */
class CTxOutCompressor
{
private:
CTxOut &txout;
public:
static uint64 CompressAmount(uint64 nAmount);
static uint64 DecompressAmount(uint64 nAmount);
CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
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);
});)
};
/** 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);
}
};
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
std::vector<CTxInUndo> vprevout;
IMPLEMENT_SERIALIZE(
READWRITE(vprevout);
)
};
/** Undo information for a CBlock */
class CBlockUndo
{
@ -480,254 +398,6 @@ public: @@ -480,254 +398,6 @@ 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 */

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