src/policy/feerate.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include <policy/feerate.h>
   7
   8 #include <tinyformat.h>
   9
  10 const std::string CURRENCY_UNIT = "BTC";
  11
  12 CFeeRate::CFeeRate(const CAmount& nFeePaid, size_t nBytes_)
  13 {
  14     assert(nBytes_ <= uint64_t(std::numeric_limits<int64_t>::max()));
  15     int64_t nSize = int64_t(nBytes_);
  16
  17     if (nSize > 0)
  18         nSatoshisPerK = nFeePaid * 1000 / nSize;
  19     else
  20         nSatoshisPerK = 0;
  21 }
  22
  23 CAmount CFeeRate::GetFee(size_t nBytes_) const
  24 {
  25     assert(nBytes_ <= uint64_t(std::numeric_limits<int64_t>::max()));
  26     int64_t nSize = int64_t(nBytes_);
  27
  28     CAmount nFee = nSatoshisPerK * nSize / 1000;
  29
  30     if (nFee == 0 && nSize != 0) {
  31         if (nSatoshisPerK > 0)
  32             nFee = CAmount(1);
  33         if (nSatoshisPerK < 0)
  34             nFee = CAmount(-1);
  35     }
  36
  37     return nFee;
  38 }
  39
  40 std::string CFeeRate::ToString() const
  41 {
  42     return strprintf("%d.%08d %s/kB", nSatoshisPerK / COIN, nSatoshisPerK % COIN, CURRENCY_UNIT);
  43 }