core: check for parent in calc TD. TD = (N != 0 == parent.TD) || (== D)

e4dba368 · obscuren · 28b39267 · e4dba368
Commit e4dba368 authored Apr 30, 2015 by obscuren
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chain_manager.go core/chain_manager.go +4 -0

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--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -49,6 +49,10 @@ func CalcDifficulty(block, parent *types.Header) *big.Int {
 }

 func CalculateTD(block, parent *types.Block) *big.Int {
+	if parent == nil {
+		return block.Difficulty()
+	}
+
 	td := new(big.Int).Add(parent.Td, block.Header().Difficulty)

 	return td