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https://github.com/aaru-dps/Aaru.git
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Natalia Portillo
828c1e3da0
Introduces constant fields for respective debug module names, replacing the hardcoded ones. This is done to standardize the naming convention, reduce redundancy and potentially avoid any typos or name mismatches across the project. This change makes the code more maintainable and easier to update in case module names need to be changed.
91 lines
3.4 KiB
C#
91 lines
3.4 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Helpers.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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// Contains helpers for DiskDupe DDI 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 © 2021-2023 Michael Drüing
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// Copyright © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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using System.Linq;
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using Aaru.Console;
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using Aaru.Helpers;
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namespace Aaru.DiscImages;
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public sealed partial class DiskDupe
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{
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bool TryReadHeader(Stream stream, ref FileHeader fhdr, ref TrackInfo[] tmap, ref long[] toffsets)
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{
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byte[] buffer = new byte[6];
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FileHeader fHeader;
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 256)
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return false;
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// read and check signature
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fHeader.signature = new byte[10];
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stream.EnsureRead(fHeader.signature, 0, 10);
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if(!fHeader.signature.SequenceEqual(_headerMagic))
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return false;
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// read and check disk type byte
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fHeader.diskType = (byte)stream.ReadByte();
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if(fHeader.diskType is < 1 or > 4)
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return false;
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// seek to start of the trackmap
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stream.Seek(TRACKMAP_OFFSET, SeekOrigin.Begin);
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int numTracks = _diskTypes[fHeader.diskType].cyl * _diskTypes[fHeader.diskType].hd;
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int trackLen = 512 * _diskTypes[fHeader.diskType].spt; // the length of a single track, in bytes
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TrackInfo[] trackMap = new TrackInfo[numTracks];
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long[] trackOffsets = new long[numTracks];
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Identified_image_with_CHS_equals_0_1_2,
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_diskTypes[fHeader.diskType].cyl, _diskTypes[fHeader.diskType].hd,
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_diskTypes[fHeader.diskType].spt);
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// read the trackmap and store the track offsets
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for(int i = 0; i < numTracks; i++)
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{
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stream.EnsureRead(buffer, 0, 6);
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trackMap[i] = Marshal.ByteArrayToStructureBigEndian<TrackInfo>(buffer);
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trackOffsets[i] = trackLen * trackMap[i].trackNumber;
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}
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fhdr = fHeader;
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tmap = trackMap;
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toffsets = trackOffsets;
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return true;
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}
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} |