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/Identify.cs
+++ b/DiscImageChef.DiscImages/HDCopy/Identify.cs
@@ -0,0 +1,79 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Identify.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Disk image plugins.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Identifies HD-Copy disk images.
+//
+// --[ 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
+// ****************************************************************************/
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using DiscImageChef.CommonTypes.Interfaces;
+
+namespace DiscImageChef.DiscImages
+{
+    public partial class HdCopy
+    {
+        public bool Identify(IFilter imageFilter)
+        {
+            Stream stream = imageFilter.GetDataForkStream();
+            stream.Seek(0, SeekOrigin.Begin);
+
+            if(stream.Length < 2 + 2 * 82) return false;
+
+            byte[] header = new byte[2 + 2 * 82];
+            stream.Read(header, 0, 2 + 2 * 82);
+
+            IntPtr hdrPtr = Marshal.AllocHGlobal(2 + 2 * 82);
+            Marshal.Copy(header, 0, hdrPtr, 2 + 2 * 82);
+            HdcpFileHeader fheader = (HdcpFileHeader)Marshal.PtrToStructure(hdrPtr, typeof(HdcpFileHeader));
+            Marshal.FreeHGlobal(hdrPtr);
+
+            /* Some sanity checks on the values we just read.
+             * We know the image is from a DOS floppy disk, so assume
+             * some sane cylinder and sectors-per-track count.
+             */
+            if(fheader.sectorsPerTrack < 8 || fheader.sectorsPerTrack > 40) return false;
+
+            if(fheader.lastCylinder < 37 || fheader.lastCylinder >= 82) return false;
+
+            // Validate the trackmap. First two tracks need to be present
+            if(fheader.trackMap[0] != 1 || fheader.trackMap[1] != 1) return false;
+
+            // all other tracks must be either present (=1) or absent (=0)
+            for(int i = 0; i < 2 * 82; i++)
+                if(fheader.trackMap[i] > 1)
+                    return false;
+
+            // TODO: validate the tracks
+            // For now, having a valid header should be sufficient.
+            return true;
+        }
+    }
+}