From f2632ff58354b1dc00f618a5476f1a082d543c0f Mon Sep 17 00:00:00 2001
From: bird_egop <sampletext32@bk.ru>
Date: Sun, 17 Nov 2024 15:54:59 +0300
Subject: [PATCH] NL unpacker

---
 NLUnpacker/NLUnpacker.csproj |   1 +
 NLUnpacker/Program.cs        | 107 +++++++----------------------------
 2 files changed, 22 insertions(+), 86 deletions(-)

diff --git a/NLUnpacker/NLUnpacker.csproj b/NLUnpacker/NLUnpacker.csproj
index 2f4fc77..1994ce8 100644
--- a/NLUnpacker/NLUnpacker.csproj
+++ b/NLUnpacker/NLUnpacker.csproj
@@ -5,6 +5,7 @@
         <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     </PropertyGroup>
 
 </Project>
diff --git a/NLUnpacker/Program.cs b/NLUnpacker/Program.cs
index b54b3c3..a1f6171 100644
--- a/NLUnpacker/Program.cs
+++ b/NLUnpacker/Program.cs
@@ -1,93 +1,28 @@
 using System.Buffers.Binary;
-using System.Runtime.CompilerServices;
 
-// ПОКА НЕ ПОНЯТНО КАК ОНО КОДИРУЕТСЯ
+var fileBytes = File.ReadAllBytes("C:\\Program Files (x86)\\Nikita\\Iron Strategy\\gamefont.rlb");
 
-// using var fs = new FileStream("gamefont.rlb", FileMode.Open, FileAccess.ReadWrite);
-//
-// int fileCount, c, i;
-// byte b, n;
-//
-// fs.Seek(4, SeekOrigin.Current);
-//
-// Span<byte> buf2 = stackalloc byte[2];
-// Span<byte> buf4 = stackalloc byte[4];
-//
-// fs.ReadExactly(buf2);
-//
-// fileCount = BinaryPrimitives.ReadInt16LittleEndian(buf2);
-//
-// fs.Seek(16 - 2, SeekOrigin.Current);
-//
-// b = (byte) fs.ReadByte();
-// c = (byte) fs.ReadByte();
-//
-// fs.Seek(12 - 2, SeekOrigin.Current);
-//
-// Span<byte> buf1 = stackalloc byte[1];
-//
-// if (32 * fileCount > 0)
-// {
-//     for (i = 0; i < 32 * fileCount; ++i)
-//     {
-//         b = (byte) ((b * 2) ^ c);
-//         n = (byte) c;
-//         c = (int) ((n >> 1) ^ b);
-//
-//         // Read, modify, and write the byte at the current position
-//         byte originalByte = (byte) fs.ReadByte();
-//         fs.Seek(-1, SeekOrigin.Current); // Move back one byte to overwrite it
-//         buf1[0] = (byte) (originalByte ^ b);
-//         fs.Write(buf1);
-//     }
-// }
+var fileCount = BinaryPrimitives.ReadInt16LittleEndian(fileBytes.AsSpan().Slice(4, 2));
 
-int v40 = 0;
-var flags = 0;
-var file_bytes = File.ReadAllBytes("gamefont.rlb");
-var FileSize = file_bytes.Length;
-var file_bytes_copy = file_bytes;
-var v8 = flags;
-if ((flags & 2) != 0)
+var decodedHeader = new byte[fileCount * 32];
+
+byte key1 = fileBytes[20];
+byte key2 = fileBytes[21];
+var decodeIndex = 0;
+
+Console.WriteLine($"Keys: {key1} {key2}");
+
+Console.WriteLine("Iteration " + decodeIndex.ToString("00") + "| " + string.Join(" ", decodedHeader.Take(20).Select(x => x.ToString("X2"))));
+
+do
 {
-    if (file_bytes[FileSize - 6] != 'A' && file_bytes[FileSize - 5] != 'O')
-        throw new Exception("4");
-    v40 = BinaryPrimitives.ReadInt32LittleEndian(
-        file_bytes.Skip(FileSize - 4)
-            .Take(4)
-            .ToArray()
-    );
-}
 
-if (file_bytes[0] != (byte)'N' || file_bytes[1] != (byte)'L' || file_bytes[2] != 0 || file_bytes[3] != 1)
-    throw new Exception("4");
-var file_count = BinaryPrimitives.ReadInt16LittleEndian(
-    file_bytes.Skip(4)
-        .Take(2)
-        .ToArray()
-);
-var file_count_copy = file_count;
-var section_mem_ptr = new byte[32 * file_count];
+    key1 = (byte) (key2 ^ (key1 << 1));
+    key2 = (byte) (key1 ^ (key2 >> 1));
+    decodedHeader[decodeIndex] = (byte) (key1 ^ fileBytes[decodeIndex + 32]);
+    Console.WriteLine($"Keys: {key1} {key2}");
+    Console.WriteLine("Iteration " + decodeIndex.ToString("00") + "| " + string.Join(" ", decodedHeader.Take(20).Select(x => x.ToString("X2"))));
+    decodeIndex++;
+} while (decodeIndex < fileCount * 32);
 
-var section_count = 0;
-var sixth_byte = file_bytes_copy[5];
-var sixth_byte_shifted_by_1_byte = file_bytes_copy[5] >> 8;
-if (32 * file_count > 0)
-{
-    do
-    {
-        sixth_byte = (byte) (sixth_byte_shifted_by_1_byte ^ (2 * sixth_byte));
-        sixth_byte_shifted_by_1_byte = sixth_byte ^ (sixth_byte_shifted_by_1_byte >> 1);
-        section_mem_ptr[section_count] = (byte) (sixth_byte ^ file_bytes_copy[section_count + 32]);
-        ++section_count;
-    } while (section_count < 32 * file_count);
-
-    v8 = flags;
-}
-
-for (var i = 0; i < section_mem_ptr.Length; i++)
-{
-    
-}
-
-File.WriteAllBytes("gamefont-dump.rlb", file_bytes);
\ No newline at end of file
+File.WriteAllBytes("encoding_table.bin", decodedHeader);
\ No newline at end of file