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Offer index and base functions.

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This commit is contained in:
JoelKatz
2012-05-19 06:25:08 -07:00
parent 353e598ad1
commit c0513e6129
2 changed files with 63 additions and 2 deletions
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9
src/Ledger.h
View File

@@ -161,12 +161,21 @@ public:
//
static uint256 getRippleIndex(const uint160& account, const uint160& extendTo, const uint160& currency);
static uint256 getRippleIndex(const uint160& account, const uint160& extendTo)
{ return getRippleIndex(account, extendTo, uint160()); }
static uint256 getRippleIndex(const NewcoinAddress& account, const NewcoinAddress& extendTo,
const uint160& currency)
{ return getRippleIndex(account.getAccountID(), extendTo.getAccountID(), currency); }
static uint160 getOfferBase(const uint160& currencyIn, const uint160& accountIn,
const uint160& currencyOut, const uint160& accountOut);
static uint256 getOfferIndex(const uint160& offerBase, uint64 rate, int skip = 0);
static int getOfferSkip(const uint256& offerId);
bool isCompatible(boost::shared_ptr<Ledger> other);
bool signLedger(std::vector<unsigned char> &signature, const LocalHanko &hanko);

56
src/LedgerIndex.cpp
View File

@@ -3,8 +3,60 @@
uint256 Ledger::getRippleIndex(const uint160& accountID, const uint160& extendTo, const uint160& currency)
{ // Index is 160-bit account credit extended to, 96-bit XOR of extending account and currency
uint256 base=getAccountRootIndex(extendTo);
memcpy(base.begin() + (160/8), (accountID^currency).begin(), (256/8)-(160/8));
uint256 base = getAccountRootIndex(extendTo);
memcpy(base.begin() + (160 / 8), (accountID ^ currency).begin(), (256 / 8) - (160 / 8));
return base;
}
uint160 Ledger::getOfferBase(const uint160& currencyIn, const uint160& accountIn,
const uint160& currencyOut, const uint160& accountOut)
{
bool inNative = !!currencyIn;
bool outNative = !!currencyOut;
if (inNative && outNative)
throw std::runtime_error("native to native offer");
Serializer s(80);
if (inNative)
{
if (!currencyIn) throw std::runtime_error("native currencies are untied");
s.add32(0); // prevent collisions by ensuring different lengths
}
else
{
if (!!currencyIn) throw std::runtime_error("national currencies must be tied");
s.add160(currencyIn);
s.add160(accountIn);
}
if (outNative)
{
if (!currencyOut) throw std::runtime_error("native currencies are untied");
}
else
{
if (!!currencyOut) throw std::runtime_error("national currencies must be tied");
s.add160(currencyOut);
s.add160(accountOut);
}
return s.getRIPEMD160();
}
uint256 Ledger::getOfferIndex(const uint160& offerBase, uint64 rate, int skip)
{ // the node for an offer index
Serializer s;
s.add160(offerBase);
s.add64(rate);
s.add32(skip);
return s.get256(0);
}
int Ledger::getOfferSkip(const uint256& offerId)
{ // how far ahead we skip if an index node is full
return *offerId.begin();
}
// vim:ts=4