blockchain: export CheckBlockHeaderSanity as a library function

blockchain/validate.go

@@ -421,13 +421,15 @@ func CountP2SHSigOps(tx *btcutil.Tx, isCoinBaseTx bool, utxoView *UtxoViewpoint)
 	return totalSigOps, nil
 }
 
-// checkBlockHeaderSanity performs some preliminary checks on a block header to
+// CheckBlockHeaderSanity performs some preliminary checks on a block header to
 // ensure it is sane before continuing with processing.  These checks are
 // context free.
 //
 // The flags do not modify the behavior of this function directly, however they
 // are needed to pass along to checkProofOfWork.
-func checkBlockHeaderSanity(header *wire.BlockHeader, powLimit *big.Int, timeSource MedianTimeSource, flags BehaviorFlags) error {
+func CheckBlockHeaderSanity(header *wire.BlockHeader, powLimit *big.Int,
+	timeSource MedianTimeSource, flags BehaviorFlags) error {
+
 	// Ensure the proof of work bits in the block header is in min/max range
 	// and the block hash is less than the target value described by the
 	// bits.
@@ -467,7 +469,7 @@ func checkBlockHeaderSanity(header *wire.BlockHeader, powLimit *big.Int, timeSou
 func checkBlockSanity(block *btcutil.Block, powLimit *big.Int, timeSource MedianTimeSource, flags BehaviorFlags) error {
 	msgBlock := block.MsgBlock()
 	header := &msgBlock.Header
-	err := checkBlockHeaderSanity(header, powLimit, timeSource, flags)
+	err := CheckBlockHeaderSanity(header, powLimit, timeSource, flags)
 	if err != nil {
 		return err
 	}