Very early SevenZip WIP version

ROMVault2/SupportedFiles/SevenZip/Structure/StreamsInfo.cs

@@ -0,0 +1,52 @@
+using System;
+using System.IO;
+
+namespace ROMVault2.SupportedFiles.SevenZip.Structure
+{
+    public class StreamsInfo
+    {
+        public ulong PackPosition;
+        public PackedStreamInfo[] PackedStreams;
+        public Folder[] Folders;
+
+        public void Read(BinaryReader br)
+        {
+            Util.log("Begin : ReadStreamsInfo", 1);
+            for (; ; )
+            {
+                HeaderProperty hp = (HeaderProperty)br.ReadByte();
+                Util.log("HeaderProperty = " + hp);
+                switch (hp)
+                {
+                    case HeaderProperty.kPackInfo:
+                        PackedStreamInfo.Read(br, out PackPosition, out PackedStreams);
+                        continue;
+
+                    case HeaderProperty.kUnPackInfo:
+                        Folder.ReadUnPackInfo(br, out Folders);
+                        continue;
+
+                    case HeaderProperty.kSubStreamsInfo:
+                        Folder.ReadSubStreamsInfo(br, ref Folders);
+                        continue;
+
+                    case HeaderProperty.kEnd:
+                        Util.log("End : ReadStreamInfo", -1);
+                        return;
+
+                    default:
+                        throw new Exception(hp.ToString());
+                }
+            }
+        }
+
+        public void Write(BinaryWriter bw)
+        {
+            bw.Write((byte)HeaderProperty.kMainStreamsInfo);
+            PackedStreamInfo.Write(bw, PackPosition, PackedStreams);
+            Folder.WriteUnPackInfo(bw, Folders);
+            Folder.WriteSubStreamsInfo(bw, Folders);
+            bw.Write((byte)HeaderProperty.kEnd);
+        }
+    }
+}