refactor into projects

BasLib/BasLib.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Common\Common.csproj" />
+    </ItemGroup>
+
+</Project>

BasLib/BasParser.cs

@@ -0,0 +1,86 @@
+using Common;
+
+namespace BasLib;
+
+public record BasContours(InnerContour[] Inner, OuterContour[] Outer);
+public record InnerContour(Vector3[] Points, uint[] Nums1, uint[] Nums2);
+public record OuterContour(Vector3[] Points);
+
+public static class BasParser
+{
+    public static BasContours ReadFile(string path)
+    {
+        using FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
+
+        return ReadFile(fs);
+    }
+
+    public static BasContours ReadFile(Stream fs)
+    {
+        var innerContourCount = fs.ReadUInt32LittleEndian();
+
+        InnerContour[] innerContours = new InnerContour[innerContourCount];
+
+        for (var i = 0; i < innerContourCount; i++)
+        {
+            var pointCount = fs.ReadUInt32LittleEndian();
+
+            Vector3[] points = new Vector3[pointCount + 1];
+    
+            for (var j = 0; j < pointCount + 1; j++)
+            {
+                var x = fs.ReadFloatLittleEndian();
+                var y = fs.ReadFloatLittleEndian();
+                var z = fs.ReadFloatLittleEndian();
+
+                points[j] = new Vector3(x, y, z);
+            }
+
+            uint[] nums1 = new uint[pointCount];
+
+            // batch 1
+            for (var j = 0; j < pointCount; j++)
+            {
+                var num = fs.ReadUInt32LittleEndian();
+                nums1[j] = num;
+            }
+
+            uint[] nums2 = new uint[pointCount];
+
+            // batch 2
+            for (var j = 0; j < pointCount; j++)
+            {
+                var num = fs.ReadUInt32LittleEndian();
+                nums2[j] = num;
+            }
+    
+            innerContours[i] = new InnerContour(points, nums1, nums2);
+        }
+
+
+        var outerContourCount = fs.ReadUInt32LittleEndian();
+
+        OuterContour[] outerContours = new OuterContour[outerContourCount];
+
+        for (var i = 0; i < outerContourCount; i++)
+        {
+            var pointCount = fs.ReadUInt32LittleEndian();
+
+            Vector3[] points = new Vector3[pointCount + 1];
+            for (var j = 0; j < pointCount + 1; j++)
+            {
+                var x = fs.ReadFloatLittleEndian();
+                var y = fs.ReadFloatLittleEndian();
+                var z = fs.ReadFloatLittleEndian();
+        
+                points[j] = new Vector3(x, y, z);
+            }
+
+            outerContours[i] = new OuterContour(points);
+        }
+
+        BasContours contours = new BasContours(innerContours, outerContours);
+
+        return contours;
+    }
+}