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feerate.cpp
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feerate.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Copyright (c) 2017-2018 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "feerate.h"
#include "amount.h"
#include "tinyformat.h"
CFeeRate::CFeeRate(const Amount nFeePaid, size_t nBytes_) {
assert(nBytes_ <= uint64_t(std::numeric_limits<int64_t>::max()));
int64_t nSize = int64_t(nBytes_);
if (nSize > 0) {
nSatoshisPerK = 1000 * nFeePaid / nSize;
} else {
nSatoshisPerK = Amount::zero();
}
}
template <bool ceil>
static Amount GetFee(size_t nBytes_, Amount nSatoshisPerK) {
assert(nBytes_ <= uint64_t(std::numeric_limits<int64_t>::max()));
int64_t nSize = int64_t(nBytes_);
// Ensure fee is rounded up when truncated if ceil is true.
Amount nFee = Amount::zero();
if (ceil) {
nFee = Amount(nSize * nSatoshisPerK % 1000 > Amount::zero()
? nSize * nSatoshisPerK / 1000 + SATOSHI
: nSize * nSatoshisPerK / 1000);
} else {
nFee = nSize * nSatoshisPerK / 1000;
}
if (nFee == Amount::zero() && nSize != 0) {
if (nSatoshisPerK > Amount::zero()) {
nFee = SATOSHI;
}
if (nSatoshisPerK < Amount::zero()) {
nFee = -SATOSHI;
}
}
return nFee;
}
Amount CFeeRate::GetFee(size_t nBytes) const {
return ::GetFee<false>(nBytes, nSatoshisPerK);
}
Amount CFeeRate::GetFeeCeiling(size_t nBytes) const {
return ::GetFee<true>(nBytes, nSatoshisPerK);
}
std::string CFeeRate::ToString() const {
return strprintf("%d.%08d %s/kB", nSatoshisPerK / COIN,
(nSatoshisPerK % COIN) / SATOSHI, CURRENCY_UNIT);
}

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