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80 lines
2.6 KiB
C#
80 lines
2.6 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 CopyTape 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 © 2011-2021 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 System.Text.RegularExpressions;
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using Aaru.CommonTypes.Interfaces;
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namespace Aaru.DiscImages
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{
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public sealed partial class CopyTape
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{
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public bool Identify(IFilter imageFilter)
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{
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if(imageFilter.GetDataForkLength() <= 16)
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return false;
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byte[] header = new byte[16];
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Stream strm = imageFilter.GetDataForkStream();
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strm.Position = 0;
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strm.Read(header, 0, 16);
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string mark = Encoding.ASCII.GetString(header);
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var blockRx = new Regex(_blockRegex);
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Match blockMt = blockRx.Match(mark);
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if(!blockMt.Success)
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return false;
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string blkSize = blockMt.Groups["blockSize"].Value;
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if(string.IsNullOrWhiteSpace(blkSize))
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return false;
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if(!uint.TryParse(blkSize, out uint blockSize))
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return false;
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if(blockSize == 0 ||
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blockSize + 17 >= imageFilter.GetDataForkLength())
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return false;
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strm.Position += blockSize;
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int newLine = strm.ReadByte();
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return newLine == 0x0A;
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}
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}
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} |