Initial commit

Co-authored-by: neko <109633131+nekoppai@users.noreply.github.com>
Co-authored-by: Lyssa <75037904+thecatontheceiling@users.noreply.github.com>
Co-authored-by: abbodi1406 <33669284+abbodi1406@users.noreply.github.com>

LibTSforge/PhysicalStore/VariableBag.cs

@@ -0,0 +1,187 @@
+namespace LibTSforge.PhysicalStore
+{
+    using System;
+    using System.Collections.Generic;
+    using System.IO;
+
+    public enum CRCBlockType : uint
+    {
+        UINT = 1 << 0,
+        STRING = 1 << 1,
+        BINARY = 1 << 2
+    }
+
+    public class CRCBlock
+    {
+        public CRCBlockType DataType;
+        public byte[] Key;
+        public string KeyAsStr
+        {
+            get
+            {
+                return Utils.DecodeString(Key);
+            }
+            set
+            {
+                Key = Utils.EncodeString(value);
+            }
+        }
+        public byte[] Value;
+        public string ValueAsStr
+        {
+            get
+            {
+                return Utils.DecodeString(Value);
+            }
+            set
+            {
+                Value = Utils.EncodeString(value);
+            }
+        }
+        public uint ValueAsInt
+        {
+            get
+            {
+                return BitConverter.ToUInt32(Value, 0);
+            }
+            set
+            {
+                Value = BitConverter.GetBytes(value);
+            }
+        }
+
+        public void Encode(BinaryWriter writer)
+        {
+            uint crc = CRC();
+            writer.Write(crc);
+            writer.Write((uint)DataType);
+            writer.Write(Key.Length);
+            writer.Write(Value.Length);
+
+            writer.Write(Key);
+            writer.Align(8);
+
+            writer.Write(Value);
+            writer.Align(8);
+        }
+
+        public static CRCBlock Decode(BinaryReader reader)
+        {
+            uint crc = reader.ReadUInt32();
+            uint type = reader.ReadUInt32();
+            uint lenName = reader.ReadUInt32();
+            uint lenVal = reader.ReadUInt32();
+
+            byte[] key = reader.ReadBytes((int)lenName);
+            reader.Align(8);
+
+            byte[] value = reader.ReadBytes((int)lenVal);
+            reader.Align(8);
+
+            CRCBlock block = new CRCBlock
+            {
+                DataType = (CRCBlockType)type,
+                Key = key,
+                Value = value,
+            };
+
+            if (block.CRC() != crc)
+            {
+                throw new InvalidDataException("Invalid CRC in variable bag.");
+            }
+
+            return block;
+        }
+
+        public uint CRC()
+        {
+            BinaryWriter wtemp = new BinaryWriter(new MemoryStream());
+            wtemp.Write(0);
+            wtemp.Write((uint)DataType);
+            wtemp.Write(Key.Length);
+            wtemp.Write(Value.Length);
+            wtemp.Write(Key);
+            wtemp.Write(Value);
+            return Utils.CRC32(wtemp.GetBytes());
+        }
+    }
+
+    public class VariableBag
+    {
+        public List<CRCBlock> Blocks = new List<CRCBlock>();
+
+        public void Deserialize(byte[] data)
+        {
+            int len = data.Length;
+
+            BinaryReader reader = new BinaryReader(new MemoryStream(data));
+
+            while (reader.BaseStream.Position < len - 0x10)
+            {
+                Blocks.Add(CRCBlock.Decode(reader));
+            }
+        }
+
+        public byte[] Serialize()
+        {
+            BinaryWriter writer = new BinaryWriter(new MemoryStream());
+
+            foreach (CRCBlock block in Blocks)
+            {
+                block.Encode(writer);
+            }
+
+            return writer.GetBytes();
+        }
+
+        public CRCBlock GetBlock(string key)
+        {
+            foreach (CRCBlock block in Blocks)
+            {
+                if (block.KeyAsStr == key)
+                {
+                    return block;
+                }
+            }
+
+            return null;
+        }
+
+        public void SetBlock(string key, byte[] value)
+        {
+            for (int i = 0; i < Blocks.Count; i++)
+            {
+                CRCBlock block = Blocks[i];
+
+                if (block.KeyAsStr == key)
+                {
+                    block.Value = value;
+                    Blocks[i] = block;
+                    break;
+                }
+            }
+        }
+
+        public void DeleteBlock(string key)
+        {
+            foreach (CRCBlock block in Blocks)
+            {
+                if (block.KeyAsStr == key)
+                {
+                    Blocks.Remove(block);
+                    return;
+                }
+            }
+        }
+
+        public VariableBag(byte[] data)
+        {
+            Deserialize(data);
+        }
+
+        public VariableBag()
+        {
+
+        }
+    }
+}