Extract Ms-cabs while reading instead of loading all datablocks into memory

SabreTools.Serialization/Models/MicrosoftCabinet/FolderTuple.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace SabreTools.Data.Models.MicrosoftCabinet
+{
+    // TODO: Surely there's a better way to do this
+    /// <summary>
+    /// Tuple to hold what's needed to open a specific folder
+    /// </summary>
+    public sealed class FolderTuple
+    {
+        /// <summary>
+        /// Filename for one cabinet in the set, if available
+        /// </summary>
+        public string Filename { get; set; } = String.Empty;
+
+        /// <summary>
+        /// Folder containing the blocks to decompress
+        /// </summary>
+        public CFFOLDER Folder { get; set; } = new CFFOLDER();
+
+        /// <summary>
+        /// A series of one or more cabinet file (CFFILE) entries
+        /// </summary>
+        public int FolderIndex { get; set; }
+    }
+}

SabreTools.Serialization/Readers/MicrosoftCabinet.cs

@@ -172,47 +172,9 @@ private static CFFOLDER ParseFolder(Stream data, CFHEADER header)
             if (header.FolderReservedSize > 0)
                 folder.ReservedData = data.ReadBytes(header.FolderReservedSize);
 
-            if (folder.CabStartOffset > 0)
-            {
-                long currentPosition = data.Position;
-                data.SeekIfPossible(folder.CabStartOffset, SeekOrigin.Begin);
-
-                folder.DataBlocks = new CFDATA[folder.DataCount];
-                for (int i = 0; i < folder.DataCount; i++)
-                {
-                    CFDATA dataBlock = ParseDataBlock(data, header.DataReservedSize);
-                    folder.DataBlocks[i] = dataBlock;
-                }
-
-                data.SeekIfPossible(currentPosition, SeekOrigin.Begin);
-            }
-
             return folder;
         }
 
-        /// <summary>
-        /// Parse a Stream into a data block
-        /// </summary>
-        /// <param name="data">Stream to parse</param>
-        /// <param name="dataReservedSize">Reserved byte size for data blocks</param>
-        /// <returns>Filled folder on success, null on error</returns>
-        private static CFDATA ParseDataBlock(Stream data, byte dataReservedSize)
-        {
-            var dataBlock = new CFDATA();
-
-            dataBlock.Checksum = data.ReadUInt32LittleEndian();
-            dataBlock.CompressedSize = data.ReadUInt16LittleEndian();
-            dataBlock.UncompressedSize = data.ReadUInt16LittleEndian();
-
-            if (dataReservedSize > 0)
-                data.SeekIfPossible(dataReservedSize, SeekOrigin.Current);
-
-            if (dataBlock.CompressedSize > 0)
-                data.SeekIfPossible(dataBlock.CompressedSize, SeekOrigin.Current);
-
-            return dataBlock;
-        }
-
         /// <summary>
         /// Parse a Stream into a file
         /// </summary>