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/Virtual98/Read.cs
+++ b/DiscImageChef.DiscImages/Virtual98/Read.cs
@@ -0,0 +1,113 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Read.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Disk image plugins.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Reads Virtual98 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 © 2011-2018 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+using DiscImageChef.CommonTypes;
+using DiscImageChef.CommonTypes.Enums;
+using DiscImageChef.CommonTypes.Interfaces;
+
+namespace DiscImageChef.DiscImages
+{
+    public partial class Virtual98
+    {
+        public bool Open(IFilter imageFilter)
+        {
+            Stream stream = imageFilter.GetDataForkStream();
+            stream.Seek(0, SeekOrigin.Begin);
+            // Even if comment is supposedly ASCII, I'm pretty sure most emulators allow Shift-JIS to be used :p
+            Encoding shiftjis = Encoding.GetEncoding("shift_jis");
+
+            v98Hdr = new Virtual98Header();
+
+            if(stream.Length < Marshal.SizeOf(v98Hdr)) return false;
+
+            byte[] hdrB = new byte[Marshal.SizeOf(v98Hdr)];
+            stream.Read(hdrB, 0, hdrB.Length);
+
+            GCHandle handle = GCHandle.Alloc(hdrB, GCHandleType.Pinned);
+            v98Hdr = (Virtual98Header)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(Virtual98Header));
+            handle.Free();
+
+            imageInfo.MediaType = MediaType.GENERIC_HDD;
+
+            imageInfo.ImageSize            = (ulong)(stream.Length - 0xDC);
+            imageInfo.CreationTime         = imageFilter.GetCreationTime();
+            imageInfo.LastModificationTime = imageFilter.GetLastWriteTime();
+            imageInfo.MediaTitle           = Path.GetFileNameWithoutExtension(imageFilter.GetFilename());
+            imageInfo.Sectors              = v98Hdr.totals;
+            imageInfo.XmlMediaType         = XmlMediaType.BlockMedia;
+            imageInfo.SectorSize           = v98Hdr.sectorsize;
+            imageInfo.Cylinders            = v98Hdr.cylinders;
+            imageInfo.Heads                = v98Hdr.surfaces;
+            imageInfo.SectorsPerTrack      = v98Hdr.sectors;
+            imageInfo.Comments             = StringHandlers.CToString(v98Hdr.comment, shiftjis);
+
+            nhdImageFilter = imageFilter;
+
+            return true;
+        }
+
+        public byte[] ReadSector(ulong sectorAddress)
+        {
+            return ReadSectors(sectorAddress, 1);
+        }
+
+        public byte[] ReadSectors(ulong sectorAddress, uint length)
+        {
+            if(sectorAddress > imageInfo.Sectors - 1)
+                throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
+
+            if(sectorAddress + length > imageInfo.Sectors)
+                throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
+
+            byte[] buffer = new byte[length * imageInfo.SectorSize];
+
+            Stream stream = nhdImageFilter.GetDataForkStream();
+
+            // V98 are lazy allocated
+            if((long)(0xDC + sectorAddress * imageInfo.SectorSize) >= stream.Length) return buffer;
+
+            stream.Seek((long)(0xDC + sectorAddress * imageInfo.SectorSize), SeekOrigin.Begin);
+
+            int toRead = (int)(length * imageInfo.SectorSize);
+
+            if(toRead + stream.Position > stream.Length) toRead = (int)(stream.Length - stream.Position);
+
+            stream.Read(buffer, 0, toRead);
+
+            return buffer;
+        }
+    }
+}