From 2b1f6f9ccf36f1e0a2c9d99154e1642f796d7c2b Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sun, 3 Jan 2016 18:54:50 +0100
Subject: BIP141: Other consensus critical limits, and BIP145

Includes changes by Suhas Daftuar, Luke-jr, and mruddy.
---
 src/primitives/block.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/primitives/block.cpp')

diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index 6fb33230a5..df900388f2 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -31,3 +31,12 @@ std::string CBlock::ToString() const
     }
     return s.str();
 }
+
+int64_t GetBlockCost(const CBlock& block)
+{
+    // This implements the cost = (stripped_size * 4) + witness_size formula,
+    // using only serialization with and without witness data. As witness_size
+    // is equal to total_size - stripped_size, this formula is identical to:
+    // cost = (stripped_size * 3) + total_size.
+    return ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
+}
-- 
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