Core - Add 'MapReader' & refactor 'MapData'

PckStudio.Core/MapReader.cs

@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+using System.IO;
+using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
+using OMI;
+
+namespace PckStudio.Core
+{
+    public class MapReader
+    {
+        public static IDictionary<string, byte[]> OpenSave(Stream stream)
+        {
+            EndiannessAwareBinaryReader reader = new EndiannessAwareBinaryReader(stream, ByteOrder.BigEndian);
+            _ = reader.ReadInt32();
+            int bufferSize = reader.ReadInt32();
+            byte[] buffer = new byte[bufferSize];
+            using Stream decompStream = new InflaterInputStream(stream);
+            decompStream.Read(buffer, 0, bufferSize);
+            reader = new EndiannessAwareBinaryReader(new MemoryStream(buffer), System.Text.Encoding.BigEndianUnicode, ByteOrder.BigEndian);
+
+            int fileStartOffset = reader.ReadInt32();
+            int fileCount = reader.ReadInt32();
+            reader.BaseStream.Seek(fileStartOffset, SeekOrigin.Begin);
+            Dictionary<string, byte[]> res = new Dictionary<string, byte[]>();
+            for (int i = 0; i < fileCount; i++)
+            {
+                string path = reader.ReadString(64).Replace('\\', '/');
+                int size = reader.ReadInt32();
+                int offset = reader.ReadInt32();
+                long timestemp = reader.ReadInt64();
+
+                long origin = reader.BaseStream.Position;
+                reader.BaseStream.Seek(offset, SeekOrigin.Begin);
+                byte[] data = reader.ReadBytes(size);
+                reader.BaseStream.Seek(origin, SeekOrigin.Begin);
+
+                res.Add(path, data);
+            }
+            return res;
+        }
+    }
+}