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BTCP-Rebase
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Remove unused CCoins methods

This commit is contained in:
Pieter Wuille 2017-04-25 11:29:41 -07:00
parent ce23efaa5c
commit 97072d6685
2 changed files with 0 additions and 199 deletions
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32
src/coins.cpp
View File

@ -10,38 +10,6 @@
#include <assert.h>
/**
* 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 CCoins::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 CCoins::Spend(uint32_t nPos)
{
if (nPos >= vout.size() || vout[nPos].IsNull())
return false;
vout[nPos].SetNull();
Cleanup();
return true;
}
bool CCoinsView::GetCoins(const COutPoint &outpoint, Coin &coin) const { return false; }
bool CCoinsView::HaveCoins(const COutPoint &outpoint) const { return false; }
uint256 CCoinsView::GetBestBlock() const { return uint256(); }

167
src/coins.h
View File

@ -82,58 +82,6 @@ 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 0: IsCoinBase()
* - bit 1: vout[0] is not spent
* - bit 2: vout[1] is not spent
* - The higher bits encode N, the number of non-zero bytes in the following bitvector.
* - In case both bit 1 and bit 2 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 1 and bit 2 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:
@ -146,98 +94,9 @@ public:
//! at which height this transaction was included in the active block chain
int nHeight;
void FromTx(const CTransaction &tx, int nHeightIn) {
fCoinBase = tx.IsCoinBase();
vout = tx.vout;
nHeight = nHeightIn;
ClearUnspendable();
}
//! construct a CCoins from a CTransaction, at a given height
CCoins(const CTransaction &tx, int nHeightIn) {
FromTx(tx, nHeightIn);
}
void Clear() {
fCoinBase = false;
std::vector<CTxOut>().swap(vout);
nHeight = 0;
}
//! empty constructor
CCoins() : fCoinBase(false), vout(0), nHeight(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 ClearUnspendable() {
BOOST_FOREACH(CTxOut &txout, vout) {
if (txout.scriptPubKey.IsUnspendable())
txout.SetNull();
}
Cleanup();
}
void swap(CCoins &to) {
std::swap(to.fCoinBase, fCoinBase);
to.vout.swap(vout);
std::swap(to.nHeight, nHeight);
}
//! equality test
friend bool operator==(const CCoins &a, const CCoins &b) {
// Empty CCoins objects are always equal.
if (a.IsPruned() && b.IsPruned())
return true;
return a.fCoinBase == b.fCoinBase &&
a.nHeight == b.nHeight &&
a.vout == b.vout;
}
friend bool operator!=(const CCoins &a, const CCoins &b) {
return !(a == b);
}
void CalcMaskSize(unsigned int &nBytes, unsigned int &nNonzeroBytes) const;
bool IsCoinBase() const {
return fCoinBase;
}
template<typename Stream>
void Serialize(Stream &s) 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
int nVersionDummy = 0;
::Serialize(s, VARINT(nVersionDummy));
// header code
::Serialize(s, VARINT(nCode));
// 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);
}
// txouts themself
for (unsigned int i = 0; i < vout.size(); i++) {
if (!vout[i].IsNull())
::Serialize(s, CTxOutCompressor(REF(vout[i])));
}
// coinbase height
::Serialize(s, VARINT(nHeight));
}
template<typename Stream>
void Unserialize(Stream &s) {
unsigned int nCode = 0;
@ -270,32 +129,6 @@ public:
}
// coinbase height
::Unserialize(s, VARINT(nHeight));
Cleanup();
}
//! mark a vout spent
bool Spend(uint32_t 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;
}
size_t DynamicMemoryUsage() const {
size_t ret = memusage::DynamicUsage(vout);
BOOST_FOREACH(const CTxOut &out, vout) {
ret += RecursiveDynamicUsage(out.scriptPubKey);
}
return ret;
}
};