Add benchmarks for readTxOut.

This commit adds a benchmark for the readTxOut function.

bench_test.go

@@ -141,6 +141,33 @@ func BenchmarkWriteOutPoint(b *testing.B) {
 	}
 }
 
+// BenchmarkReadTxOut performs a benchmark on how long it takes to read a
+// transaction output.
+func BenchmarkReadTxOut(b *testing.B) {
+	buf := []byte{
+		0x00, 0xf2, 0x05, 0x2a, 0x01, 0x00, 0x00, 0x00, // Transaction amount
+		0x43, // Varint for length of pk script
+		0x41, // OP_DATA_65
+		0x04, 0x96, 0xb5, 0x38, 0xe8, 0x53, 0x51, 0x9c,
+		0x72, 0x6a, 0x2c, 0x91, 0xe6, 0x1e, 0xc1, 0x16,
+		0x00, 0xae, 0x13, 0x90, 0x81, 0x3a, 0x62, 0x7c,
+		0x66, 0xfb, 0x8b, 0xe7, 0x94, 0x7b, 0xe6, 0x3c,
+		0x52, 0xda, 0x75, 0x89, 0x37, 0x95, 0x15, 0xd4,
+		0xe0, 0xa6, 0x04, 0xf8, 0x14, 0x17, 0x81, 0xe6,
+		0x22, 0x94, 0x72, 0x11, 0x66, 0xbf, 0x62, 0x1e,
+		0x73, 0xa8, 0x2c, 0xbf, 0x23, 0x42, 0xc8, 0x58,
+		0xee, // 65-byte signature
+		0xac, // OP_CHECKSIG
+	}
+	var txOut btcwire.TxOut
+	for i := 0; i < b.N; i++ {
+		err := btcwire.TstReadTxOut(bytes.NewBuffer(buf), 0, 0, &txOut)
+		if err != nil {
+			b.Log(err)
+		}
+	}
+}
+
 // BenchmarkWriteTxOut performs a benchmark on how long it takes to write
 // a transaction output.
 func BenchmarkWriteTxOut(b *testing.B) {

internal_test.go

@@ -115,6 +115,12 @@ func TstWriteOutPoint(w io.Writer, pver uint32, version uint32, op *OutPoint) er
 	return writeOutPoint(w, pver, version, op)
 }
 
+// TstReadTxOut makes the internal readTxOut function available to the test
+// package.
+func TstReadTxOut(r io.Reader, pver uint32, version uint32, to *TxOut) error {
+	return readTxOut(r, pver, version, to)
+}
+
 // TstWriteTxOut makes the internal writeTxOut function available to the test
 // package.
 func TstWriteTxOut(w io.Writer, pver uint32, version uint32, to *TxOut) error {