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/Helpers.cs
+++ b/DiscImageChef.DiscImages/HDCopy/Helpers.cs
@@ -0,0 +1,83 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Helpers.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Disk image plugins.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Contains helpers for 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;
+
+namespace DiscImageChef.DiscImages
+{
+    public partial class HdCopy
+    {
+        void ReadTrackIntoCache(Stream stream, int tracknum)
+        {
+            byte[] trackData = new byte[imageInfo.SectorSize * imageInfo.SectorsPerTrack];
+            byte[] blkHeader = new byte[3];
+
+            // check that track is present
+            if(trackOffset[tracknum] == -1)
+                throw new InvalidDataException("Tried reading a track that is not present in image");
+
+            stream.Seek(trackOffset[tracknum], SeekOrigin.Begin);
+
+            // read the compressed track data
+            stream.Read(blkHeader, 0, 3);
+            short compressedLength = (short)(BitConverter.ToInt16(blkHeader, 0) - 1);
+            byte  escapeByte       = blkHeader[2];
+
+            byte[] cBuffer = new byte[compressedLength];
+            stream.Read(cBuffer, 0, compressedLength);
+
+            // decompress the data
+            int sIndex = 0; // source buffer position
+            int dIndex = 0; // destination buffer position
+            while(sIndex < compressedLength)
+                if(cBuffer[sIndex] == escapeByte)
+                {
+                    sIndex++; // skip over escape byte
+                    byte fillByte  = cBuffer[sIndex++];
+                    byte fillCount = cBuffer[sIndex++];
+                    // fill destination buffer
+                    for(int i = 0; i < fillCount; i++) trackData[dIndex++] = fillByte;
+                }
+                else
+                    trackData[dIndex++] = cBuffer[sIndex++];
+
+            // check that the number of bytes decompressed matches a whole track
+            if(dIndex != imageInfo.SectorSize * imageInfo.SectorsPerTrack)
+                throw new InvalidDataException("Track decompression yielded incomplete data");
+
+            // store track in cache
+            trackCache[tracknum] = trackData;
+        }
+    }
+}