init

ParkanPlayground/ListMetadataItem.cs

@@ -0,0 +1,3 @@
+namespace ParkanPlayground;
+
+public record ListMetadataItem(string ItemType, int ItemLength, string FileName, int OffsetInFile);

ParkanPlayground/ParkanPlayground.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

ParkanPlayground/Program.cs

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+using System.Buffers.Binary;
+using System.Text;using ParkanPlayground;
+
+var libFile = "C:\\Program Files (x86)\\Nikita\\Iron Strategy\\ui\\ui_back.lib";
+
+using FileStream nResFs = new FileStream(libFile, FileMode.Open);
+
+Span<byte> buffer = stackalloc byte[4];
+
+nResFs.ReadExactly(buffer);
+
+var nResHeader = BinaryPrimitives.ReadInt32LittleEndian(buffer);
+
+var str = Encoding.ASCII.GetString(buffer);
+
+Console.WriteLine($"NRES Header: {nResHeader:X} - {str}");
+
+// ----
+nResFs.ReadExactly(buffer);
+
+var version = BinaryPrimitives.ReadInt32LittleEndian(buffer);
+
+Console.WriteLine($"VERSION: {version:X}");
+
+// ----
+nResFs.ReadExactly(buffer);
+
+var elementCount = BinaryPrimitives.ReadInt32LittleEndian(buffer);
+
+Console.WriteLine($"ElementCount: {elementCount}");
+
+// ----
+nResFs.ReadExactly(buffer);
+
+var totalLength = BinaryPrimitives.ReadInt32LittleEndian(buffer);
+
+Console.WriteLine($"TOTAL_LENGTH: {totalLength}");
+
+// ----
+
+nResFs.Seek(-elementCount * 64, SeekOrigin.End);
+
+_ = 5;
+
+var elements = new List<ListMetadataItem>(elementCount);
+
+Span<byte> metaDataBuffer = stackalloc byte[64];
+for (int i = 0; i < elementCount; i++)
+{
+    nResFs.ReadExactly(metaDataBuffer);
+
+    var itemType = Encoding.ASCII.GetString(metaDataBuffer.Slice(0, 8));
+
+    var itemLength = BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer.Slice(12, 4));
+
+    var fileNameBlock = metaDataBuffer.Slice(20, 20);
+    var len = fileNameBlock.IndexOf((byte)'\0');
+    if (len == -1) len = 20; // whole 20 bytes is a filename
+    var fileName = Encoding.ASCII.GetString(fileNameBlock.Slice(0, len));
+
+    var offsetInFile = BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer.Slice(56, 4));
+
+    var lastMagicNumber = BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer.Slice(60, 4));
+
+    Console.WriteLine(
+        $"File {i+1}: \n" +
+        $"\tType: {itemType}\n" +
+        $"\tItemLength: {itemLength}\n" +
+        $"\tFileName: {fileName}\n" +
+        $"\tOffsetInFile: {offsetInFile}\n" +
+        $"\tLastMagicNumber: {lastMagicNumber}"
+    );
+    
+    elements.Add(new ListMetadataItem(itemType, itemLength, fileName, offsetInFile));
+    
+    metaDataBuffer.Clear();
+}
+
+var libFileName = new FileInfo(libFile).Name;
+
+if (Directory.Exists(libFileName))
+{
+    Directory.Delete(libFileName, true);
+}
+
+var dir = Directory.CreateDirectory(libFileName);
+
+byte[] copyBuffer = new byte[8192];
+
+foreach (var element in elements)
+{
+    nResFs.Seek(element.OffsetInFile, SeekOrigin.Begin);
+    using var destFs = new FileStream(Path.Combine(libFileName, element.FileName), FileMode.CreateNew);
+
+    var totalCopiedBytes = 0;
+    while (totalCopiedBytes < element.ItemLength)
+    {
+        var needReadBytes = Math.Min(element.ItemLength - totalCopiedBytes, copyBuffer.Length);
+        var readBytes = nResFs.Read(copyBuffer, 0, needReadBytes);
+        
+        destFs.Write(copyBuffer, 0, readBytes);
+
+        totalCopiedBytes += readBytes;
+    }
+}