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109 lines
4.5 KiB
C#
109 lines
4.5 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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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 Sydex TeleDisk 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 © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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using Aaru.Logging;
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namespace Aaru.Images;
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public sealed partial class TeleDisk
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{
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#region IMediaImage Members
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/// <inheritdoc />
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public bool Identify(IFilter imageFilter)
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{
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_header = new Header();
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var headerBytes = new byte[12];
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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stream.EnsureRead(headerBytes, 0, 12);
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_header.Signature = BitConverter.ToUInt16(headerBytes, 0);
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if(_header.Signature != TD_MAGIC && _header.Signature != TD_ADV_COMP_MAGIC) return false;
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_header.Sequence = headerBytes[2];
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_header.DiskSet = headerBytes[3];
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_header.Version = headerBytes[4];
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_header.DataRate = headerBytes[5];
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_header.DriveType = headerBytes[6];
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_header.Stepping = headerBytes[7];
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_header.DosAllocation = headerBytes[8];
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_header.Sides = headerBytes[9];
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_header.Crc = BitConverter.ToUInt16(headerBytes, 10);
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var headerBytesForCrc = new byte[10];
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Array.Copy(headerBytes, headerBytesForCrc, 10);
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ushort calculatedHeaderCrc = TeleDiskCrc(0x0000, headerBytesForCrc);
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AaruLogging.Debug(MODULE_NAME, "header.signature = 0x{0:X4}", _header.Signature);
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AaruLogging.Debug(MODULE_NAME, "header.sequence = 0x{0:X2}", _header.Sequence);
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AaruLogging.Debug(MODULE_NAME, "header.diskSet = 0x{0:X2}", _header.DiskSet);
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AaruLogging.Debug(MODULE_NAME, "header.version = 0x{0:X2}", _header.Version);
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AaruLogging.Debug(MODULE_NAME, "header.dataRate = 0x{0:X2}", _header.DataRate);
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AaruLogging.Debug(MODULE_NAME, "header.driveType = 0x{0:X2}", _header.DriveType);
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AaruLogging.Debug(MODULE_NAME, "header.stepping = 0x{0:X2}", _header.Stepping);
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AaruLogging.Debug(MODULE_NAME, "header.dosAllocation = 0x{0:X2}", _header.DosAllocation);
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AaruLogging.Debug(MODULE_NAME, "header.sides = 0x{0:X2}", _header.Sides);
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AaruLogging.Debug(MODULE_NAME, "header.crc = 0x{0:X4}", _header.Crc);
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AaruLogging.Debug(MODULE_NAME, Localization.calculated_header_crc_equals_0_X4, calculatedHeaderCrc);
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// We need more checks as the magic is too simply.
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// This may deny legal images
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// That would be much of a coincidence
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if(_header.Crc == calculatedHeaderCrc) return true;
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if(_header.Sequence != 0x00) return false;
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if(_header.DataRate != DATA_RATE_250_KBPS &&
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_header.DataRate != DATA_RATE_300_KBPS &&
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_header.DataRate != DATA_RATE_500_KBPS)
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return false;
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return _header.DriveType is DRIVE_TYPE_35_DD
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or DRIVE_TYPE_35_ED
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or DRIVE_TYPE_35_HD
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or DRIVE_TYPE_525_DD
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or DRIVE_TYPE_525_HD
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or DRIVE_TYPE_525_HD_DD_DISK
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or DRIVE_TYPE_8_INCH;
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}
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#endregion
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} |