Cosmetic: move CTransaction::GetMinFee out of header file

1 files changed, 49 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 302292ee29..70ffe7343a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -477,6 +477,55 @@ bool CTransaction::CheckTransaction() const
     return true;
 }
 
+int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree,
+                              enum GetMinFee_mode mode) const
+{
+    // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
+    int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
+
+    unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
+    unsigned int nNewBlockSize = nBlockSize + nBytes;
+    int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee;
+
+    if (fAllowFree)
+    {
+        if (nBlockSize == 1)
+        {
+            // Transactions under 10K are free
+            // (about 4500 BTC if made of 50 BTC inputs)
+            if (nBytes < 10000)
+                nMinFee = 0;
+        }
+        else
+        {
+            // Free transaction area
+            if (nNewBlockSize < 27000)
+                nMinFee = 0;
+        }
+    }
+
+    // To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
+    if (nMinFee < nBaseFee)
+    {
+        BOOST_FOREACH(const CTxOut& txout, vout)
+            if (txout.nValue < CENT)
+                nMinFee = nBaseFee;
+    }
+
+    // Raise the price as the block approaches full
+    if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2)
+    {
+        if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN)
+            return MAX_MONEY;
+        nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize);
+    }
+
+    if (!MoneyRange(nMinFee))
+        nMinFee = MAX_MONEY;
+    return nMinFee;
+}
+
+
 bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
                         bool* pfMissingInputs)
 {