feat: add WKB to EWKB conversion with SRID handling and integrate into MSSQL transformation

scripts/wkb-to-ewkb/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+const sridFlag = 0x20000000
+
+func wkbToEwkbWithSrid(geometry []byte, srid int) []byte {
+	if len(geometry) < 5 {
+		return geometry
+	}
+
+	var byteOrder binary.ByteOrder
+	if geometry[0] == 0 {
+		byteOrder = binary.BigEndian
+	} else {
+		byteOrder = binary.LittleEndian
+	}
+
+	wkbType := byteOrder.Uint32(geometry[1:5])
+	if wkbType&sridFlag != 0 {
+		return geometry
+	}
+
+	ewkbType := wkbType | sridFlag
+
+	result := make([]byte, len(geometry)+4)
+
+	result[0] = geometry[0]
+
+	byteOrder.PutUint32(result[1:5], ewkbType)
+
+	byteOrder.PutUint32(result[5:9], uint32(srid))
+
+	copy(result[9:], geometry[5:])
+
+	return result
+}
+
+func main() {
+	shape := []byte{
+		1, 3, 0, 0, 0, 1, 0, 0, 0, 5, 0, 0, 0, 217, 61, 121, 88, 168, 57, 83, 192,
+		60, 78, 209, 145, 92, 222, 39, 192, 232, 106, 43, 246, 151, 57, 83, 192,
+		60, 78, 209, 145, 92, 222, 39, 192, 232, 106, 43, 246, 151, 57, 83, 192,
+		174, 182, 98, 127, 217, 221, 39, 192, 217, 61, 121, 88, 168, 57, 83, 192,
+		174, 182, 98, 127, 217, 221, 39, 192, 217, 61, 121, 88, 168, 57, 83, 192,
+		60, 78, 209, 145, 92, 222, 39, 192,
+	}
+
+	srid := 4326
+	result := wkbToEwkbWithSrid(shape, srid)
+
+	fmt.Printf("WKB Original (len): %d\n", len(shape))
+	fmt.Printf("EWKB Result   (len): %d\n", len(result))
+	fmt.Printf("Primeros bytes (original): %v\n", shape[:10])
+	fmt.Printf("Primeros bytes (resultado): %v\n", result[:10])
+}