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79 lines
3.1 KiB
C#
79 lines
3.1 KiB
C#
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// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Identify.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies HD-Copy disk images.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2017 Michael Drüing
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// Copyright © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using DiscImageChef.CommonTypes.Interfaces;
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namespace DiscImageChef.DiscImages
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{
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public partial class HdCopy
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{
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public bool Identify(IFilter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 2 + 2 * 82) return false;
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byte[] header = new byte[2 + 2 * 82];
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stream.Read(header, 0, 2 + 2 * 82);
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IntPtr hdrPtr = Marshal.AllocHGlobal(2 + 2 * 82);
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Marshal.Copy(header, 0, hdrPtr, 2 + 2 * 82);
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HdcpFileHeader fheader = (HdcpFileHeader)Marshal.PtrToStructure(hdrPtr, typeof(HdcpFileHeader));
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Marshal.FreeHGlobal(hdrPtr);
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/* Some sanity checks on the values we just read.
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* We know the image is from a DOS floppy disk, so assume
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* some sane cylinder and sectors-per-track count.
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*/
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if(fheader.sectorsPerTrack < 8 || fheader.sectorsPerTrack > 40) return false;
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if(fheader.lastCylinder < 37 || fheader.lastCylinder >= 82) return false;
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// Validate the trackmap. First two tracks need to be present
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if(fheader.trackMap[0] != 1 || fheader.trackMap[1] != 1) return false;
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// all other tracks must be either present (=1) or absent (=0)
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for(int i = 0; i < 2 * 82; i++)
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if(fheader.trackMap[i] > 1)
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return false;
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// TODO: validate the tracks
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// For now, having a valid header should be sufficient.
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return true;
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}
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}
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}
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