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Ledger hash skip list basic support.

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This commit is contained in:
JoelKatz
2012-10-29 12:55:52 -07:00
parent 0db9fc865c
commit 7cd8be5b2b
5 changed files with 48 additions and 0 deletions
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35
src/Ledger.cpp
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@@ -885,6 +885,41 @@ uint256 Ledger::getAccountRootIndex(const uint160& uAccountID)
return s.getSHA512Half();
}
uint256 Ledger::getLedgerHashIndex()
{ // get the index of the node that holds the last 256 ledgers
Serializer s(2);
s.add16(spaceHashes);
return s.getSHA512Half();
}
uint256 Ledger::getLedgerHashIndex(uint32 desiredLedgerIndex)
{ // get the index of the node that holds the set of 256 ledgers that includes this ledger's hash
// (or the first ledger after it if it's not a multiple of 256)
Serializer s(6);
s.add16(spaceHashes);
s.add32(desiredLedgerIndex >> 16);
return s.getSHA512Half();
}
int Ledger::getLedgerHashOffset(uint32 ledgerIndex)
{ // get the offset for this ledger's hash (or the first one after it) in the every-256-ledger table
return (ledgerIndex >> 8) % 256;
}
int Ledger::getLedgerHashOffset(uint32 desiredLedgerIndex, uint32 currentLedgerIndex)
{ // get the offset for this ledger's hash in the every-ledger table, -1 if not in it
if (desiredLedgerIndex >= currentLedgerIndex)
return -1;
if (currentLedgerIndex < 256)
return desiredLedgerIndex;
if (desiredLedgerIndex < (currentLedgerIndex - 256))
return -1;
return currentLedgerIndex - desiredLedgerIndex - 1;
}
uint256 Ledger::getBookBase(const uint160& uTakerPaysCurrency, const uint160& uTakerPaysIssuerID,
const uint160& uTakerGetsCurrency, const uint160& uTakerGetsIssuerID)
{