Refactor image classes and split them to smaller files.

2025-12-16 19:24:25 +00:00 · 2018-07-23 23:25:43 +01:00
parent 55ca2d23b6
commit ed88989642
445 changed files with 50086 additions and 34342 deletions
--- a/DiscImageChef.DiscImages/HDCopy/HDCopy.cs
+++ b/DiscImageChef.DiscImages/HDCopy/HDCopy.cs
@@ -0,0 +1,123 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : HDCopy.cs
+// Author(s)      : Michael Drüing <michael@drueing.de>
+//
+// Component      : Disk image plugins.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Manages floppy disk images created with HD-Copy
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2017 Michael Drüing
+// Copyright © 2011-2018 Natalia Portillo
+// ****************************************************************************/
+
+/* Some information on the file format from Michal Necasek (www.os2museum.com):
+ * 
+ * The HD-Copy diskette image format was used by the eponymous DOS utility,
+ * written by Oliver Fromme around 1995. The HD-Copy format is relatively
+ * straightforward, supporting images with 512-byte sector size and uniform
+ * sectors per track count. A basic form of run-length compression is also
+ * supported, and empty/unused tracks aren't stored in the image. Images
+ * with up to 82 cylinders are supported.
+ *
+ * No provision appears to be made for single-sided images. The disk image
+ * is stored as a sequence of compressed tracks (where a track refers to only
+ * one side of the disk), and individual tracks may be left out.
+ *
+ * The HD-Copy RLE compression works as follows. The image is divided into a
+ * number of independent blocks, one per track. Each compressed block starts
+ * with a header which contains the size of compressed data (16-bit little
+ * endian) and the escape byte. Whenever the escape byte is encountered in the
+ * byte stream, it is followed by a data byte and a count byte.
+ *
+ * Note that HD-Copy uses RLE compression for sequences of as few as three
+ * bytes, even though that provides no benefit.
+ *
+ * It would be tempting to perform in-place decompression to save memory.
+ * Unfortunately the simplistic RLE algorithm means the encoded data may be
+ * larger than the decoded version, with unknown worst case behavior. Hence
+ * the compressed data for a sector may not fit into a buffer the size of the
+ * uncompressed sector.
+ *
+ * There is no signature, hence heuristics must be used to identify a HD-Copy
+ * diskette image. Fortunately, the HD-Copy header is highly recognizable.
+ */
+
+using System.Collections.Generic;
+using DiscImageChef.CommonTypes.Enums;
+using DiscImageChef.CommonTypes.Interfaces;
+using DiscImageChef.CommonTypes.Structs;
+
+namespace DiscImageChef.DiscImages
+{
+    public partial class HdCopy : IMediaImage
+    {
+        /// <summary>
+        ///     The HDCP file header after the image has been opened
+        /// </summary>
+        HdcpFileHeader fileHeader;
+
+        /// <summary>
+        ///     The ImageFilter we're reading from, after the file has been opened
+        /// </summary>
+        IFilter hdcpImageFilter;
+        ImageInfo imageInfo;
+
+        /// <summary>
+        ///     Every track that has been read is cached here
+        /// </summary>
+        Dictionary<int, byte[]> trackCache = new Dictionary<int, byte[]>();
+
+        /// <summary>
+        ///     The offset in the file where each track starts, or -1 if the track is not present
+        /// </summary>
+        Dictionary<int, long> trackOffset = new Dictionary<int, long>();
+
+        public HdCopy()
+        {
+            imageInfo = new ImageInfo
+            {
+                ReadableSectorTags    = new List<SectorTagType>(),
+                ReadableMediaTags     = new List<MediaTagType>(),
+                HasPartitions         = false,
+                HasSessions           = false,
+                Version               = null,
+                Application           = null,
+                ApplicationVersion    = null,
+                Creator               = null,
+                Comments              = null,
+                MediaManufacturer     = null,
+                MediaModel            = null,
+                MediaSerialNumber     = null,
+                MediaBarcode          = null,
+                MediaPartNumber       = null,
+                MediaSequence         = 0,
+                LastMediaSequence     = 0,
+                DriveManufacturer     = null,
+                DriveModel            = null,
+                DriveSerialNumber     = null,
+                DriveFirmwareRevision = null
+            };
+        }
+    }
+}