本文整理汇总了C++中Blob::clear方法的典型用法代码示例。如果您正苦于以下问题：C++ Blob::clear方法的具体用法？C++ Blob::clear怎么用？C++ Blob::clear使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Blob的用法示例。
在下文中一共展示了Blob::clear方法的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: bignum_error
bool Base58::decode (const char* psz, Blob& vchRet, Alphabet const& alphabet)
{
CAutoBN_CTX pctx;
vchRet.clear ();
CBigNum bn58 = 58;
CBigNum bn = 0;
CBigNum bnChar;
while (isspace (*psz))
psz++;
// Convert big endian string to bignum
for (const char* p = psz; *p; p++)
{
// VFALCO TODO Make this use the inverse table!
// Or better yet ditch this and call raw_decode
//
const char* p1 = strchr (alphabet.chars(), *p);
if (p1 == nullptr)
{
while (isspace (*p))
p++;
if (*p != '\0')
return false;
break;
}
bnChar.setuint (p1 - alphabet.chars());
if (!BN_mul (&bn, &bn, &bn58, pctx))
throw bignum_error ("DecodeBase58 : BN_mul failed");
bn += bnChar;
}
// Get bignum as little endian data
Blob vchTmp = bn.getvch ();
// Trim off sign byte if present
if (vchTmp.size () >= 2 && vchTmp.end ()[-1] == 0 && vchTmp.end ()[-2] >= 0x80)
vchTmp.erase (vchTmp.end () - 1);
// Restore leading zeros
int nLeadingZeros = 0;
for (const char* p = psz; *p == alphabet.chars()[0]; p++)
nLeadingZeros++;
vchRet.assign (nLeadingZeros + vchTmp.size (), 0);
// Convert little endian data to big endian
std::reverse_copy (vchTmp.begin (), vchTmp.end (), vchRet.end () - vchTmp.size ());
return true;
}示例2: doTxHistory
// {
// start: <index>
// }
Json::Value doTxHistory (RPC::Context& context)
{
context.loadType = Resource::feeMediumBurdenRPC;
if (!context.params.isMember (jss::start))
return rpcError (rpcINVALID_PARAMS);
unsigned int startIndex = context.params[jss::start].asUInt ();
if ((startIndex > 10000) && (! isUnlimited (context.role)))
return rpcError (rpcNO_PERMISSION);
Json::Value obj;
Json::Value txs;
obj[jss::index] = startIndex;
std::string sql =
boost::str (boost::format (
"SELECT LedgerSeq, Status, RawTxn "
"FROM Transactions ORDER BY LedgerSeq desc LIMIT %u,20;")
% startIndex);
{
auto db = context.app.getTxnDB ().checkoutDb ();
boost::optional<std::uint64_t> ledgerSeq;
boost::optional<std::string> status;
soci::blob sociRawTxnBlob (*db);
soci::indicator rti;
Blob rawTxn;
soci::statement st = (db->prepare << sql,
soci::into (ledgerSeq),
soci::into (status),
soci::into (sociRawTxnBlob, rti));
st.execute ();
while (st.fetch ())
{
if (soci::i_ok == rti)
convert(sociRawTxnBlob, rawTxn);
else
rawTxn.clear ();
if (auto trans = Transaction::transactionFromSQL (
ledgerSeq, status, rawTxn, context.app))
txs.append (trans->getJson (0));
}
}
obj[jss::txs] = txs;
return obj;
}示例3:
bool Base58::decodeWithCheck (const char* psz, Blob& vchRet, Alphabet const& alphabet)
{
if (!decode (psz, vchRet, alphabet))
return false;
if (vchRet.size () < 4)
{
vchRet.clear ();
return false;
}
uint256 hash = SHA256Hash (vchRet.begin (), vchRet.end () - 4);
if (memcmp (&hash, &vchRet.end ()[-4], 4) != 0)
{
vchRet.clear ();
return false;
}
vchRet.resize (vchRet.size () - 4);
return true;
}示例4: encode
WriteMethod OrfParser::encode(
Blob& blob,
const byte* pData,
uint32_t size,
const ExifData& exifData,
const IptcData& iptcData,
const XmpData& xmpData
)
{
/* Todo: Implement me!
return TiffParserWorker::encode(blob,
pData,
size,
exifData,
iptcData,
xmpData,
TiffCreator::create,
TiffMapping::findEncoder);
*/
blob.clear();
return wmIntrusive;
}示例5:
WriteMethod Cr2Parser::encode(
Blob& blob,
const byte* /*pData*/,
uint32_t /*size*/,
const ExifData& /*exifData*/,
const IptcData& /*iptcData*/,
const XmpData& /*xmpData*/
)
{
/* Todo: Implement me!
TiffParserWorker::encode(blob,
pData,
size,
exifData,
iptcData,
xmpData,
TiffCreator::create,
TiffMapping::findEncoder);
*/
blob.clear();
return wmIntrusive;
}示例6: if
//.........这里部分代码省略.........
}
else if (!forward && (findLedger != 0))
{
auto b58acct = idCache.toBase58(account);
sql = boost::str (boost::format(
(R"(SELECT AccountTransactions.LedgerSeq,AccountTransactions.TxnSeq,
Status,RawTxn,TxnMeta
FROM AccountTransactions, Transactions WHERE
(AccountTransactions.TransID = Transactions.TransID AND
AccountTransactions.Account = '%s' AND
AccountTransactions.LedgerSeq BETWEEN '%u' AND '%u')
OR
(AccountTransactions.TransID = Transactions.TransID AND
AccountTransactions.Account = '%s' AND
AccountTransactions.LedgerSeq = '%u' AND
AccountTransactions.TxnSeq <= '%u')
ORDER BY AccountTransactions.LedgerSeq DESC,
AccountTransactions.TxnSeq DESC
LIMIT %u;
)"))
% b58acct
% minLedger
% (findLedger - 1)
% b58acct
% findLedger
% findSeq
% queryLimit);
}
else
{
assert (false);
// sql is empty
return;
}
{
auto db (connection.checkoutDb());
Blob rawData;
Blob rawMeta;
boost::optional<std::uint64_t> ledgerSeq;
boost::optional<std::uint32_t> txnSeq;
boost::optional<std::string> status;
soci::blob txnData (*db);
soci::blob txnMeta (*db);
soci::indicator dataPresent, metaPresent;
soci::statement st = (db->prepare << sql,
soci::into (ledgerSeq),
soci::into (txnSeq),
soci::into (status),
soci::into (txnData, dataPresent),
soci::into (txnMeta, metaPresent));
st.execute ();
while (st.fetch ())
{
if (lookingForMarker)
{
if (findLedger == ledgerSeq.value_or (0) &&
findSeq == txnSeq.value_or (0))
{
lookingForMarker = false;
}
}
else if (numberOfResults == 0)
{
token = Json::objectValue;
token[jss::ledger] = rangeCheckedCast<std::uint32_t>(ledgerSeq.value_or (0));
token[jss::seq] = txnSeq.value_or (0);
break;
}
if (!lookingForMarker)
{
if (dataPresent == soci::i_ok)
convert (txnData, rawData);
else
rawData.clear ();
if (metaPresent == soci::i_ok)
convert (txnMeta, rawMeta);
else
rawMeta.clear ();
// Work around a bug that could leave the metadata missing
if (rawMeta.size() == 0)
onUnsavedLedger(ledgerSeq.value_or (0));
onTransaction(rangeCheckedCast<std::uint32_t>(ledgerSeq.value_or (0)),
*status, rawData, rawMeta);
--numberOfResults;
}
}
}
return;
}