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Function to retrieve previous ledger hashes from the ledger.

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This commit is contained in:
JoelKatz
2012-12-28 20:40:30 -08:00
parent 3c9be6f549
commit 3ff4dc99ad
2 changed files with 35 additions and 8 deletions
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42
src/cpp/ripple/Ledger.cpp
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@@ -647,14 +647,6 @@ Json::Value Ledger::getJson(int options)
}
ledger["accountState"] = state;
}
if (mAccountStateMap && ((options & LEDGER_JSON_HISTORY) != 0))
{
SLE::pointer hashIndex = getSLE(getLedgerHashIndex());
if (hashIndex)
ledger["previousHashes"] = hashIndex->getJson(0);
else
ledger["previousHashes"] = "missing";
}
ledger["seqNum"] = boost::lexical_cast<std::string>(mLedgerSeq);
return ledger;
}
@@ -962,6 +954,40 @@ int Ledger::getLedgerHashOffset(uint32 desiredLedgerIndex, uint32 currentLedgerI
return currentLedgerIndex - desiredLedgerIndex - 1;
}
uint256 Ledger::getLedgerHash(uint32 ledgerIndex)
{ // return the hash of the specified ledger, 0 if not available
// easy cases
if (ledgerIndex > mLedgerSeq)
return uint256();
if (ledgerIndex == mLedgerSeq)
return getHash();
if (ledgerIndex == (mLedgerSeq - 1))
return mParentHash;
// within 255
int offset = getLedgerHashOffset(ledgerIndex, mLedgerSeq);
if (offset != -1)
{
SLE::pointer hashIndex = getSLE(getLedgerHashIndex());
if (hashIndex)
return hashIndex->getFieldV256(sfHashes).peekValue().at(offset);
else
assert(false);
}
if ((ledgerIndex & 0xff) != 0)
return uint256();
SLE::pointer hashIndex = getSLE(getLedgerHashIndex(ledgerIndex));
if (hashIndex)
return hashIndex->getFieldV256(sfHashes).peekValue().at(getLedgerHashOffset(ledgerIndex, mLedgerSeq));
else
assert(false);
return uint256();
}
uint256 Ledger::getBookBase(const uint160& uTakerPaysCurrency, const uint160& uTakerPaysIssuerID,
const uint160& uTakerGetsCurrency, const uint160& uTakerGetsIssuerID)
{