refactor into projects

MshLib/Msh0x0A.cs

@@ -0,0 +1,66 @@
+using System.Buffers.Binary;
+using System.Text;
+using NResLib;
+
+namespace MshLib;
+
+/// <summary>
+/// MSH-компонент 0x0A: строки узлов.
+/// У FParkan: Res10 / Node strings. Старое локальное имя: ExternalRefs.
+/// </summary>
+public class Msh0x0A
+{
+    public static List<string> ReadComponent(FileStream mshFs, NResArchive archive)
+    {
+        var aFileEntry = archive.Files.FirstOrDefault(x => x.FileType == "0A 00 00 00");
+
+        if (aFileEntry is null)
+        {
+            throw new Exception("Archive doesn't contain 0A component");
+        }
+
+        var data = new byte[aFileEntry.FileLength];
+        mshFs.Seek(aFileEntry.OffsetInFile, SeekOrigin.Begin);
+        mshFs.ReadExactly(data, 0, data.Length);
+
+        int pos = 0;
+        var strings = new List<string>();
+        while (pos < data.Length)
+        {
+            if (pos + 4 > data.Length)
+            {
+                throw new Exception("Node strings component (0x0A) has truncated length prefix");
+            }
+
+            var len = BinaryPrimitives.ReadInt32LittleEndian(data.AsSpan(pos));
+            if (len < 0 || pos + 4 + len > data.Length)
+            {
+                throw new Exception("Node strings component (0x0A) has invalid string length");
+            }
+
+            if (len == 0)
+            {
+                pos += 4;
+                strings.Add("");
+            }
+            else
+            {
+                var strBytes = data.AsSpan(pos + 4, len);
+                var str = Encoding.ASCII.GetString(strBytes);
+                strings.Add(str);
+                pos += len + 4;
+                if (pos < data.Length && data[pos] == 0)
+                {
+                    pos++;
+                }
+            }
+        }
+
+        if (strings.Count != aFileEntry.ElementCount)
+        {
+            throw new Exception("String count mismatch in 0A component");
+        }
+
+        return strings;
+    }
+}