psi/psi_test.go: improved some naming

stream/mts/psi/psi_test.go

@@ -79,7 +79,7 @@ var (
 
 	// standardPmtTimeLocation is a standard PMT with time and location
 	// descriptors, but time and location fields zeroed out.
-	standardPmtTimeLocation = PSI{
+	standardPmtWithMeta = PSI{
 		Pf:  0x00,
 		Tid: 0x02,
 		Ssi: true,
@@ -124,14 +124,14 @@ const (
 // GPS string for testing
 // TODO: make these realistic
 var (
-	locationTstStr1 = [LocationDataSize]byte{
+	locationBytes1 = [LocationDataSize]byte{
 		0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
 		0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
 		0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
 		0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
 	}
 
-	locationTstStr2 = [LocationDataSize]byte{
+	locationBytes2 = [LocationDataSize]byte{
 		0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01,
 		0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01,
 		0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01,
@@ -153,7 +153,7 @@ var (
 
 // Parts to construct bytes of pmt with time and bytes
 var (
-	pmtTimeLocationBytesPart1 = []byte{
+	pmtWithMetaHead = []byte{
 		0x00, 0x02, 0xb0, 0x12, 0x00, 0x01, 0xc1, 0x00, 0x00, 0xe1, 0x00, 0xf0, 0x0a,
 		TimeDescTag,                                    // Descriptor tag for timestamp
 		TimeDataSize,                                   // Length of bytes to follow
@@ -161,7 +161,7 @@ var (
 		LocationDescTag,  // Descriptor tag for location
 		LocationDataSize, // Length of bytes to follow
 	}
-	pmtTimeLocationBytesPart2 = []byte{
+	pmtWithMetaTail = []byte{
 		0x1b, 0xe1, 0x00, 0xf0, 0x00,
 	}
 )
@@ -186,10 +186,10 @@ var (
 	}
 
 	// Bytes representing pmt with time1 and location1
-	pmtTimeLocationBytes1 = buildPmtTimeLocationBytes(locationTstStr1[:])
+	pmtWithMetaTst1 = buildPmtWithMeta(locationBytes1[:])
 
 	// bytes representing pmt with with time1 and location 2
-	pmtTimeLocationBytes2 = buildPmtTimeLocationBytes(locationTstStr2[:])
+	pmtWithMetaTst2 = buildPmtWithMeta(locationBytes2[:])
 )
 
 // bytesTests contains data for testing the Bytes() funcs for the PSI data struct
@@ -273,7 +273,7 @@ var bytesTests = []struct {
 						{
 							Dt: LocationDescTag,
 							Dl: LocationDataSize,
-							Dd: locationTstStr1[:],
+							Dd: locationBytes1[:],
 						},
 					},
 					Essd: &ESSD{
@@ -284,7 +284,7 @@ var bytesTests = []struct {
 				},
 			},
 		},
-		want: buildPmtTimeLocationBytes(locationTstStr1[:]),
+		want: buildPmtWithMeta(locationBytes1[:]),
 	},
 }
 
@@ -336,32 +336,32 @@ func TestTimeGet(t *testing.T) {
 
 // TestLocationGet checks that we can correctly get location data from a pmt table
 func TestLocationGet(t *testing.T) {
-	pb := standardPmtTimeLocation.Bytes()
-	err := UpdateLocation(pb, string(locationTstStr1[:]))
+	pb := standardPmtWithMeta.Bytes()
+	err := UpdateLocation(pb, string(locationBytes1[:]))
 	if err != nil {
-		t.Errorf("Error for TestLocationGet UpdateLocation(pb, locationTstStr1): %v", err)
+		t.Errorf("Error for TestLocationGet UpdateLocation(pb, locationBytes1): %v", err)
 	}
 	g, err := LocationFrom(pb)
 	if err != nil {
 		t.Errorf("Error for TestLocationGet LocationOf(pb): %v", err)
 	}
-	if g != string(locationTstStr1[:]) {
-		t.Errorf(errCmp, "TestLocationGet", locationTstStr1, g)
+	if g != string(locationBytes1[:]) {
+		t.Errorf(errCmp, "TestLocationGet", locationBytes1, g)
 	}
 }
 
 // TestLocationUpdate checks to see if we can update the location string in a pmt correctly
 func TestLocationUpdate(t *testing.T) {
-	cpy := make([]byte, len(pmtTimeLocationBytes1))
-	copy(cpy, pmtTimeLocationBytes1)
+	cpy := make([]byte, len(pmtWithMetaTst1))
+	copy(cpy, pmtWithMetaTst1)
 	cpy = addCrc(cpy)
-	err := UpdateLocation(cpy, string(locationTstStr2[:]))
+	err := UpdateLocation(cpy, string(locationBytes2[:]))
 	cpy = cpy[:len(cpy)-4]
 	if err != nil {
 		t.Errorf("Update time returned err: %v", err)
 	}
-	if !bytes.Equal(pmtTimeLocationBytes2, cpy) {
-		t.Errorf(errCmp, "TestLocationUpdate", pmtTimeLocationBytes2, cpy)
+	if !bytes.Equal(pmtWithMetaTst2, cpy) {
+		t.Errorf(errCmp, "TestLocationUpdate", pmtWithMetaTst2, cpy)
 	}
 }
 
@@ -377,7 +377,10 @@ func TestTrim(t *testing.T) {
 // buildPmtTimeLocationBytes is a helper function to help construct the byte slices
 // for pmts with time and location, as the location data field is 32 bytes, i.e. quite large
 // to type out
-func buildPmtTimeLocationBytes(tstStr []byte) []byte {
-	return append(append(append(make([]byte, 0), pmtTimeLocationBytesPart1...),
-		tstStr...), pmtTimeLocationBytesPart2...)
+func buildPmtWithMeta(tstStr []byte) []byte {
+	dst := make([]byte, len(pmtWithMetaHead)+32+len(pmtWithMetaTail))
+	copy(dst, pmtWithMetaHead)
+	copy(dst[len(pmtWithMetaHead):], tstStr)
+	copy(dst[len(pmtWithMetaHead)+32:], pmtWithMetaTail)
+	return dst
 }