added RndPoral func to create Random Portal code

nmslib_test.go

@@ -5,6 +5,11 @@ import (
 	"testing"
 )
 
+func TestRndPortal(t *testing.T) {
+	fmt.Printf("\nRandom Portal Code: ")
+	fmt.Println(RndPortal())
+}
+
 func TestPortal2Galactic(t *testing.T) {
 	want, err := P2gc("006afa556c30")
 	if err != nil {
@@ -51,7 +56,7 @@ func TestGalactic2portal(t *testing.T) {
 
 func TestCreateBanner(t *testing.T) {
 	fmt.Printf("\nTesting CreateBanner: ")
-	CreateBanner("006afa556c30", "/tmp/Test.png", 0)
+	CreateBanner(RndPortal(), "/tmp/Test.png", 0)
 }
 
 func TestTranslate(t *testing.T) {

rpcg.go

@@ -0,0 +1,41 @@
+package nmslib
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+/*
+	[P][SSS][YY][ZZZ][XXX] – (P = Planet Index / S = Star System Index / Y = Height / Z = Width / X = Length)
+
+	`Solar System Index
+		A Solar System Index is assigned to each star system in a region. It always begins at SolarSystemIndex=001
+		and counts up by one for every star system. The number of star systems in a region is variable so the
+		maximum value of the Solar System Index is also variable, though the two correspond directly. To date there
+		is no discovered value that is higher than SolarSystemIndex=243 (Mamundi-Kate in the Baadossm Anomaly of
+		Euclid galaxy), meaning that 579 is the maximum number of star systems yet discovered in a region. Based
+		on the evidence that every region has a SolarSystemIndex=079 and SolarSystemIndex=07A (with the former
+		always having a Black Hole and the latter always having an Atlas Station), it is known that every region has
+		at least 122 star systems. SolarSystemIndex=000 always leads to the region's first system, just like
+		PlanetIndex=0 always leads to the first portal of a system due to the error proximity mechanic.`
+	Source https://nomanssky.fandom.com/wiki/Portal_address#Solar_System_Index
+
+*/
+
+func RndPortal() (final string) {
+	rand.Seed(time.Now().UnixNano())
+	min := 0x1
+	ymax := 0xFF
+	xzmax := 0xFFF
+	ssimax := 0x242 // set this low to lower chances of an invalid address
+
+	x := rand.Intn(xzmax-min+1) + min
+	z := rand.Intn(xzmax-min+1) + min
+	y := rand.Intn(ymax-min+1) + min
+	ssi := rand.Intn(ssimax-min+1) + min
+
+	final = fmt.Sprintf("%00X%03X%02X%03X%03X", 1, ssi, y, z, x)
+
+	return
+}