Expose ExplicitCoveredFields from the wallet package

wallet/wallet.go

@@ -645,6 +645,42 @@ func IsRelevantTransaction(txn types.Transaction, addr types.Address) bool {
 	return false
 }
 
+// ExplicitCoveredFields returns a CoveredFields that covers all elements
+// present in txn.
+func ExplicitCoveredFields(txn types.Transaction) (cf types.CoveredFields) {
+	for i := range txn.SiacoinInputs {
+		cf.SiacoinInputs = append(cf.SiacoinInputs, uint64(i))
+	}
+	for i := range txn.SiacoinOutputs {
+		cf.SiacoinOutputs = append(cf.SiacoinOutputs, uint64(i))
+	}
+	for i := range txn.FileContracts {
+		cf.FileContracts = append(cf.FileContracts, uint64(i))
+	}
+	for i := range txn.FileContractRevisions {
+		cf.FileContractRevisions = append(cf.FileContractRevisions, uint64(i))
+	}
+	for i := range txn.StorageProofs {
+		cf.StorageProofs = append(cf.StorageProofs, uint64(i))
+	}
+	for i := range txn.SiafundInputs {
+		cf.SiafundInputs = append(cf.SiafundInputs, uint64(i))
+	}
+	for i := range txn.SiafundOutputs {
+		cf.SiafundOutputs = append(cf.SiafundOutputs, uint64(i))
+	}
+	for i := range txn.MinerFees {
+		cf.MinerFees = append(cf.MinerFees, uint64(i))
+	}
+	for i := range txn.ArbitraryData {
+		cf.ArbitraryData = append(cf.ArbitraryData, uint64(i))
+	}
+	for i := range txn.Signatures {
+		cf.Signatures = append(cf.Signatures, uint64(i))
+	}
+	return
+}
+
 // SumOutputs returns the total value of the supplied outputs.
 func SumOutputs(outputs []types.SiacoinElement) (sum types.Currency) {
 	for _, o := range outputs {