Add project files.

PDTools.Algorithms/PDTools.Algorithms.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

PDTools.Algorithms/QuickmatchAlgorithms.cs

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+using System;
+
+namespace PDTools.Algorithms
+{
+    public class QuickMatchAlgorithms
+    {
+        // From race_online_event.ad:getReward
+
+        // game:qmatch.prize_entries_num_table
+        public static int[] sEntriesNumTable = new int[] { 100, 100, 100, 100, 100, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150 }; // %
+
+        // game:qmatch.prize_base
+        public static int sPrizeBase = 100; // %
+
+        /// <summary>
+        /// Original implementation (Provide prizeTable & race limit laps)
+        /// </summary>
+        /// <param name="laps"></param>
+        /// <param name="finishOrder">0 indexed finish order of the player</param>
+        /// <param name="racerCount">Count of players that finished</param>
+        /// <param name="prizeTable"></param>
+        /// <param name="sRaceLimitLaps"></param>
+        /// <returns></returns>
+        public int GetQuickMatchReward(int laps, int finishOrder, int finishRacerCount, int[] prizeTable, int sRaceLimitLaps = 1)
+        {
+            // If prize table does not cover the player's position, its default to 0
+            if (prizeTable.Length <= finishOrder)
+                return 0;
+
+            int value = prizeTable[finishOrder];
+            float prize = (float)value;
+
+            // No money if outside valid count ranges (1 alone player can still get a prize)
+            if (finishRacerCount < 1 || finishRacerCount > 16)
+                return 0;
+
+            // More entries = extra credits
+            float ratio = sEntriesNumTable[finishRacerCount - 1] / 100f;
+            prize *= ratio;
+
+            if (sRaceLimitLaps < 1)
+                return 0;
+
+            // laps will be equal to sRaceLimitLaps so no changes are made there
+            ratio = laps / sRaceLimitLaps;
+            prize *= ratio;
+
+            // If we have a server option (in %) to give more or less money than usual
+            ratio = sPrizeBase / 100f;
+            prize *= ratio;
+
+            // Daily login event bonus is included after this function
+
+            return (int)prize;
+        }
+    }
+}

PDTools.Compression/Deflater.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.IO;
+using System.IO.Compression;
+
+using Syroot.BinaryData;
+
+using ICSharpCodeDeflater = ICSharpCode.SharpZipLib.Zip.Compression.Deflater;
+
+namespace PDTools.Compression
+{
+    public class Deflater
+    {
+        public const uint CompressMagic = 0xFF_F7_EE_C5;
+
+        /// <summary>
+        /// Safely decompress a file in a stream and saves it to the provided path.
+        /// </summary>
+        public static bool TryDeflate(Stream input, Stream output, int maxDecompressedSize = -1, bool closeStream = true)
+        {
+            if (input.Length <= 8)
+                return false;
+
+            var bs = new BinaryStream(input);
+
+            if (bs.ReadUInt32() != CompressMagic)
+                return false;
+
+            int sizeComplement = -bs.ReadInt32();
+            if (maxDecompressedSize != -1 && sizeComplement > maxDecompressedSize)
+                return false;
+
+            try
+            {
+                var ds = new DeflateStream(bs, CompressionMode.Decompress);
+                ds.CopyTo(output);
+            }
+            catch
+            {
+                return false;
+            }
+
+            if (output.Length != sizeComplement)
+                return false;
+
+            return true;
+        }
+
+        /// <summary>
+        /// Safely decompress a file in a stream and saves it to the provided path asynchronously.
+        /// </summary>
+        public static async Task<bool> TryDeflateAsync(Stream input, Stream output, int maxDecompressedSize = -1, bool closeStream = true)
+        {
+            if (input.Length <= 8)
+                return false;
+
+            var bs = new BinaryStream(input);
+
+            if (await bs.ReadUInt32Async() != CompressMagic)
+                return false;
+
+            int sizeComplement = -(await bs.ReadInt32Async());
+            if (maxDecompressedSize != -1 && sizeComplement > maxDecompressedSize)
+                return false;
+
+            try
+            {
+                var ds = new DeflateStream(bs, CompressionMode.Decompress);
+                await ds.CopyToAsync(output);
+            }
+            catch
+            {
+                return false;
+            }
+
+            if (output.Length != sizeComplement)
+                return false;
+
+            return true;
+        }
+
+        public static byte[] ZlibCompress(byte[] input)
+        {
+            using (var ms = new MemoryStream(input.Length))
+            using (var bs = new BinaryStream(ms))
+            {
+                bs.WriteUInt32(0xFFF7EEC5);
+                bs.WriteInt32(-input.Length);
+
+                var d = new ICSharpCodeDeflater(ICSharpCodeDeflater.DEFAULT_COMPRESSION, true);
+                d.SetInput(input);
+                d.Finish();
+
+                byte[] output = new byte[input.Length];
+                int count = d.Deflate(output);
+                bs.Write(output, 0, count);
+                return ms.ToArray();
+            }
+        }
+
+        public static byte[] Deflate(byte[] data)
+        {
+            using (var ms = new MemoryStream(data))
+            using (var bs = new BinaryStream(ms))
+            {
+                bs.ReadUInt32(); // Magic
+                int outSize = -bs.ReadInt32();
+
+                byte[] deflatedData = new byte[outSize];
+                using (var ds = new DeflateStream(bs, CompressionMode.Decompress))
+                    ds.Read(deflatedData, 0, deflatedData.Length);
+
+                return deflatedData;
+            }
+        }
+    }
+}

PDTools.Compression/PDTools.Compression.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SharpZipLib" Version="1.3.2" />
+    <PackageReference Include="Syroot.BinaryData" Version="5.2.2" />
+    <PackageReference Include="Syroot.BinaryData.Memory" Version="5.2.2" />
+  </ItemGroup>
+
+</Project>

PDTools.Crypto/CRC32.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PDTools.Crypto
+{
+    public static class CRC32
+    {
+        public static uint crc32(Span<byte> data, int length)
+        {
+            uint checksum = 0xFFFFFFFF;
+            if (length > 0)
+            {
+                for (int i = 0; i < data.Length; i++)
+                    checksum = crc[(byte)(checksum ^ data[i])] ^ (checksum >> 8);
+            }
+
+            return ~checksum;
+        }
+
+        public static uint[] crc =
+        {
+            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
+            0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
+            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
+            0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
+            0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
+            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
+            0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
+            0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
+            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
+            0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
+            0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
+            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
+            0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
+            0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
+            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
+            0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
+            0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
+            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
+            0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
+            0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
+            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
+            0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
+            0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
+            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
+            0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
+            0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
+            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
+            0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
+            0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
+            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
+            0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
+            0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
+            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
+        };
+    }
+}

PDTools.Crypto/MCipher.cs

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+using System;
+
+namespace PDTools.Crypto
+{
+    public class MCipherGT5
+    {
+        public static byte[] Decrypt(Span<byte> buffer)
+        {
+            byte[] outBuf = new byte[buffer.Length - 8];
+            if (DecryptImpl(buffer, outBuf, buffer.Length, 0x3039))
+                return outBuf;
+            return null;
+        }
+
+        private static bool DecryptImpl(Span<byte> buffer, Span<byte> outBuffer, int length, uint crcSeed)
+        {
+            int size = SharedCrypto.EncryptUnit_Decrypt(buffer, length, crcSeed, 0.327032387256622, 0.858476877212524, false);
+            if (size > -1)
+                buffer[8..].CopyTo(outBuffer);
+            return size > -1;
+        }
+
+        public static void Encrypt()
+        {
+
+        }
+    }
+
+    public class MCipherGT6
+    {
+        public static byte[] Decrypt(Span<byte> buffer)
+        {
+            byte[] outBuf = new byte[buffer.Length];
+            if (DecryptImpl(buffer, outBuf, buffer.Length, 0x3039))
+                return outBuf;
+            return null;
+        }
+
+        private static bool DecryptImpl(Span<byte> buffer, Span<byte> outBuffer, int length, uint crcSeed)
+        {
+            int size = SharedCrypto.EncryptUnit_Decrypt(buffer, length, crcSeed, 0.262591, 0.753459f, false);
+            if (size > -1)
+                buffer[8..].CopyTo(outBuffer);
+            return size > -1;
+        }
+
+        public static void Encrypt()
+        {
+
+        }
+    }
+}