2018-07-23 23:25:43 +01:00
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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 XGS emulator 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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2018-12-29 17:34:38 +00:00
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// Copyright © 2011-2019 Natalia Portillo
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2018-07-23 23:25:43 +01:00
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// ****************************************************************************/
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using System;
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using System.IO;
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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 Apple2Mg
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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 < 65) return false;
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byte[] header = new byte[64];
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stream.Read(header, 0, 64);
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uint magic = BitConverter.ToUInt32(header, 0x00);
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if(magic != MAGIC) return false;
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uint dataoff = BitConverter.ToUInt32(header, 0x18);
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if(dataoff > stream.Length) return false;
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uint datasize = BitConverter.ToUInt32(header, 0x1C);
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// There seems to be incorrect endian in some images on the wild
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if(datasize == 0x00800C00) datasize = 0x000C8000;
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if(dataoff + datasize > stream.Length) return false;
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uint commentoff = BitConverter.ToUInt32(header, 0x20);
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if(commentoff > stream.Length) return false;
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uint commentsize = BitConverter.ToUInt32(header, 0x24);
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if(commentoff + commentsize > stream.Length) return false;
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uint creatoroff = BitConverter.ToUInt32(header, 0x28);
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if(creatoroff > stream.Length) return false;
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uint creatorsize = BitConverter.ToUInt32(header, 0x2C);
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return creatoroff + creatorsize <= stream.Length;
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}
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}
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}
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