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113 lines
4.0 KiB
C#
113 lines
4.0 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 CDRWin cuesheets (cue/bin).
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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 System.Text.RegularExpressions;
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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 CdrWin
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{
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#region IWritableOpticalImage Members
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// Due to .cue format, this method must parse whole file, ignoring errors (those will be returned by OpenImage()).
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/// <inheritdoc />
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public bool Identify(IFilter imageFilter)
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{
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_cdrwinFilter = imageFilter;
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try
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{
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imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
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var testArray = new byte[512];
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imageFilter.GetDataForkStream().EnsureRead(testArray, 0, 512);
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imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
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// Check for unexpected control characters that shouldn't be present in a text file and can crash this plugin
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var twoConsecutiveNulls = false;
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for(var i = 0; i < 512; i++)
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{
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if(i >= imageFilter.GetDataForkStream().Length) break;
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if(testArray[i] == 0)
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{
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if(twoConsecutiveNulls) return false;
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twoConsecutiveNulls = true;
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}
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else
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twoConsecutiveNulls = false;
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if(testArray[i] < 0x20 && testArray[i] != 0x0A && testArray[i] != 0x0D && testArray[i] != 0x00)
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return false;
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}
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_cueStream = new StreamReader(_cdrwinFilter.GetDataForkStream());
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while(_cueStream.Peek() >= 0)
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{
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string line = _cueStream.ReadLine();
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Regex sr = SessionRegex();
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Regex rr = CommentRegex();
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Regex cr = McnRegex();
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Regex fr = FileRegex();
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Regex tr = CdtextRegex();
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// First line must be SESSION, REM, CATALOG, FILE or CDTEXTFILE.
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Match sm = sr.Match(line ?? "");
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Match rm = rr.Match(line ?? "");
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Match cm = cr.Match(line ?? "");
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Match fm = fr.Match(line ?? "");
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Match tm = tr.Match(line ?? "");
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return sm.Success || rm.Success || cm.Success || fm.Success || tm.Success;
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}
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return false;
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}
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catch(Exception ex)
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{
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AaruLogging.Error(Localization.Exception_trying_to_identify_image_file_0, _cdrwinFilter);
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AaruLogging.Exception(ex, Localization.Exception_trying_to_identify_image_file_0, _cdrwinFilter);
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return false;
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}
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}
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#endregion
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} |