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77 lines
2.9 KiB
C#
77 lines
2.9 KiB
C#
// /***************************************************************************
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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) : Michael Drüing <michael@drueing.de>
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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 d2f/WC DISK IMAGE 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 © 2018-2019 Michael Drüing
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// Copyright © 2011-2019 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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using System.Text;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Helpers;
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namespace DiscImageChef.DiscImages
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{
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public partial class WCDiskImage
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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 < 32) return false;
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byte[] header = new byte[32];
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stream.Read(header, 0, 32);
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WCDiskImageFileHeader fheader = Marshal.ByteArrayToStructureLittleEndian<WCDiskImageFileHeader>(header);
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/* check the signature */
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if(Encoding.ASCII.GetString(fheader.signature).TrimEnd('\x00') != fileSignature) return false;
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/* Some sanity checks on the values we just read. */
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if(fheader.version > 1) return false;
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if(fheader.heads < 1 || fheader.heads > 2) return false;
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if(fheader.sectorsPerTrack < 8 || fheader.sectorsPerTrack > 18) return false;
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if(fheader.cylinders < 1 || fheader.cylinders > 80) return false;
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if(fheader.extraTracks[0] > 1 || fheader.extraTracks[1] > 1 || fheader.extraTracks[2] > 1 ||
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fheader.extraTracks[3] > 1) return false;
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if(((byte)fheader.extraFlags & ~0x03) != 0) return false;
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// TODO: validate all sectors
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// For now, having a valid header will suffice.
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return true;
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}
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}
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} |