Blind update of zip code to newest RVWorld version

SabreTools.Library/External/Compress/SevenZip/Structure/StreamsInfo.cs

@@ -0,0 +1,84 @@
+using System;
+using System.IO;
+using System.Security.Permissions;
+using System.Text;
+using Compress.Utils;
+
+namespace Compress.SevenZip.Structure
+{
+    public class StreamsInfo
+    {
+        public ulong PackPosition;
+        public PackedStreamInfo[] PackedStreams;
+        public Folder[] Folders;
+
+        public void Read(BinaryReader br)
+        {
+            for (;;)
+            {
+                HeaderProperty hp = (HeaderProperty) br.ReadByte();
+                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:
+                        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);
+        }
+
+
+        public void Report(ref StringBuilder sb)
+        {
+            sb.AppendLine("  StreamsInfo");
+            sb.AppendLine("  -----------");
+            sb.AppendLine($"  PackPosition = {PackPosition}");
+            if (PackedStreams == null)
+            {
+                sb.AppendLine($"  PackedStreams[] = null");
+            }
+            else
+            {
+                sb.AppendLine($"  PackedStreams[] = ({PackedStreams.Length})");
+                foreach (PackedStreamInfo psi in PackedStreams)
+                {
+                    psi.Report(ref sb);
+                }
+            }
+            if (Folders == null)
+            {
+                sb.AppendLine($"  Folders[] = null");
+            }
+            else
+            {
+                sb.AppendLine($"  Folders[] = ({Folders.Length})");
+                foreach (Folder f in Folders)
+                {
+                    f.Report(ref sb);
+                }
+            }
+        }
+    }
+}