mirror of
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1047 lines
45 KiB
C#
1047 lines
45 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : GDI.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disc image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages Dreamcast GDI disc 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 © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using DiscImageChef.Checksums;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.Console;
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using DiscImageChef.Filters;
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namespace DiscImageChef.DiscImages
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{
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// TODO: There seems no be no clear definition on how to treat pregaps that are not included in the file, so this is just appending it to start of track
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// TODO: This format doesn't support to specify pregaps that are included in the file (like Redump ones)
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public class Gdi : IMediaImage
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{
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const string REGEX_TRACK =
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@"\s?(?<track>\d+)\s+(?<start>\d+)\s(?<flags>\d)\s(?<type>2352|2048)\s(?<filename>.+)\s(?<offset>\d+)$";
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ulong densitySeparationSectors;
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GdiDisc discimage;
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StreamReader gdiStream;
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ImageInfo imageInfo;
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Stream imageStream;
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/// <summary>Dictionary, index is track #, value is track number, or 0 if a TOC</summary>
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Dictionary<uint, ulong> offsetmap;
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public Gdi()
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{
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imageInfo = new ImageInfo
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{
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ReadableSectorTags = new List<SectorTagType>(),
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ReadableMediaTags = new List<MediaTagType>(),
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HasPartitions = true,
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HasSessions = true,
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Version = null,
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ApplicationVersion = null,
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MediaTitle = null,
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Creator = null,
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MediaManufacturer = null,
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MediaModel = null,
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MediaPartNumber = null,
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MediaSequence = 0,
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LastMediaSequence = 0,
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DriveManufacturer = null,
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DriveModel = null,
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DriveSerialNumber = null,
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DriveFirmwareRevision = null
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};
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}
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public string Name => "Dreamcast GDI image";
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public Guid Id => new Guid("281ECBF2-D2A7-414C-8497-1A33F6DCB2DD");
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public ImageInfo Info => imageInfo;
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public string Format => "Dreamcast GDI image";
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public List<Partition> Partitions { get; set; }
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public List<Track> Tracks
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{
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get
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{
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List<Track> tracks = new List<Track>();
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foreach(GdiTrack gdiTrack in discimage.Tracks)
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{
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Track track = new Track
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{
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Indexes = new Dictionary<int, ulong>(),
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TrackDescription = null,
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TrackStartSector = gdiTrack.StartSector,
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TrackPregap = gdiTrack.Pregap,
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TrackSession = (ushort)(gdiTrack.HighDensity ? 2 : 1),
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TrackSequence = gdiTrack.Sequence,
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TrackType = gdiTrack.Tracktype,
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TrackFilter = gdiTrack.Trackfilter,
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TrackFile = gdiTrack.Trackfile,
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TrackFileOffset = (ulong)gdiTrack.Offset,
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TrackFileType = "BINARY",
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TrackRawBytesPerSector = gdiTrack.Bps,
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TrackBytesPerSector = gdiTrack.Tracktype == TrackType.Data ? 2048 : 2352,
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TrackSubchannelType = TrackSubchannelType.None
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};
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track.TrackEndSector = track.TrackStartSector + gdiTrack.Sectors - 1;
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tracks.Add(track);
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}
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return tracks;
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}
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}
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public List<Session> Sessions => discimage.Sessions;
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// Due to .gdi format, this method must parse whole file, ignoring errors (those will be thrown by OpenImage()).
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public bool Identify(IFilter imageFilter)
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{
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try
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{
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imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
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byte[] testArray = new byte[512];
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imageFilter.GetDataForkStream().Read(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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bool twoConsecutiveNulls = false;
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for(int 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 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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gdiStream = new StreamReader(imageFilter.GetDataForkStream());
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int lineNumber = 0;
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int tracksFound = 0;
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int tracks = 0;
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while(gdiStream.Peek() >= 0)
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{
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lineNumber++;
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string line = gdiStream.ReadLine();
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if(lineNumber == 1)
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{
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if(!int.TryParse(line, out tracks)) return false;
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}
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else
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{
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Regex regexTrack = new Regex(REGEX_TRACK);
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Match trackMatch = regexTrack.Match(line ?? throw new InvalidOperationException());
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if(!trackMatch.Success) return false;
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tracksFound++;
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}
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}
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if(tracks == 0) return false;
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return tracks == tracksFound;
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}
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catch(Exception ex)
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{
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DicConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter.GetBasePath());
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DicConsole.ErrorWriteLine("Exception: {0}", ex.Message);
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DicConsole.ErrorWriteLine("Stack trace: {0}", ex.StackTrace);
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return false;
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}
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}
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public bool Open(IFilter imageFilter)
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{
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if(imageFilter == null) return false;
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try
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{
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imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
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gdiStream = new StreamReader(imageFilter.GetDataForkStream());
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int lineNumber = 0;
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bool highDensity = false;
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// Initialize all RegExs
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Regex regexTrack = new Regex(REGEX_TRACK);
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// Initialize all RegEx matches
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// Initialize disc
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discimage = new GdiDisc {Sessions = new List<Session>(), Tracks = new List<GdiTrack>()};
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ulong currentStart = 0;
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offsetmap = new Dictionary<uint, ulong>();
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densitySeparationSectors = 0;
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while(gdiStream.Peek() >= 0)
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{
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lineNumber++;
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string line = gdiStream.ReadLine();
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if(lineNumber == 1)
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{
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if(!int.TryParse(line, out _))
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throw new ImageNotSupportedException("Not a correct Dreamcast GDI image");
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}
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else
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{
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Match trackMatch = regexTrack.Match(line ?? throw new InvalidOperationException());
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if(!trackMatch.Success)
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throw new ImageNotSupportedException($"Unknown line \"{line}\" at line {lineNumber}");
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DicConsole.DebugWriteLine("GDI plugin",
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"Found track {0} starts at {1} flags {2} type {3} file {4} offset {5} at line {6}",
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trackMatch.Groups["track"].Value, trackMatch.Groups["start"].Value,
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trackMatch.Groups["flags"].Value, trackMatch.Groups["type"].Value,
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trackMatch.Groups["filename"].Value,
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trackMatch.Groups["offset"].Value, lineNumber);
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FiltersList filtersList = new FiltersList();
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GdiTrack currentTrack = new GdiTrack
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{
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Bps = ushort.Parse(trackMatch.Groups["type"].Value),
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Flags = byte.Parse(trackMatch.Groups["flags"].Value),
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Offset = long.Parse(trackMatch.Groups["offset"].Value),
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Sequence = uint.Parse(trackMatch.Groups["track"].Value),
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StartSector = ulong.Parse(trackMatch.Groups["start"].Value),
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Trackfilter =
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filtersList.GetFilter(Path.Combine(imageFilter.GetParentFolder(),
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trackMatch.Groups["filename"].Value
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.Replace("\\\"", "\"").Trim('"')))
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};
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currentTrack.Trackfile = currentTrack.Trackfilter.GetFilename();
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if(currentTrack.StartSector - currentStart > 0)
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if(currentTrack.StartSector == 45000)
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{
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highDensity = true;
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offsetmap.Add(0, currentStart);
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densitySeparationSectors = currentTrack.StartSector - currentStart;
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currentStart = currentTrack.StartSector;
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}
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else
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{
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currentTrack.Pregap = currentTrack.StartSector - currentStart;
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currentTrack.StartSector -= currentTrack.StartSector - currentStart;
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}
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if((currentTrack.Trackfilter.GetDataForkLength() - currentTrack.Offset) % currentTrack.Bps != 0)
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throw new ImageNotSupportedException("Track size not a multiple of sector size");
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currentTrack.Sectors =
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(ulong)((currentTrack.Trackfilter.GetDataForkLength() - currentTrack.Offset) /
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currentTrack.Bps);
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currentTrack.Sectors += currentTrack.Pregap;
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currentStart += currentTrack.Sectors;
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currentTrack.HighDensity = highDensity;
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currentTrack.Tracktype =
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(currentTrack.Flags & 0x4) == 0x4 ? TrackType.CdMode1 : TrackType.Audio;
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discimage.Tracks.Add(currentTrack);
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}
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}
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Session[] sessions = new Session[2];
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for(int s = 0; s < sessions.Length; s++)
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if(s == 0)
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{
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sessions[s].SessionSequence = 1;
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foreach(GdiTrack trk in discimage.Tracks.Where(trk => !trk.HighDensity))
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{
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if(sessions[s].StartTrack == 0) sessions[s].StartTrack = trk.Sequence;
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else if(sessions[s].StartTrack > trk.Sequence)
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sessions[s].StartTrack = trk.Sequence;
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if(sessions[s].EndTrack < trk.Sequence) sessions[s].EndTrack = trk.Sequence;
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if(sessions[s].StartSector > trk.StartSector) sessions[s].StartSector = trk.StartSector;
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if(sessions[s].EndSector < trk.Sectors + trk.StartSector - 1)
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sessions[s].EndSector = trk.Sectors + trk.StartSector - 1;
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}
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}
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else
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{
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sessions[s].SessionSequence = 2;
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foreach(GdiTrack trk in discimage.Tracks.Where(trk => trk.HighDensity))
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{
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if(sessions[s].StartTrack == 0) sessions[s].StartTrack = trk.Sequence;
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else if(sessions[s].StartTrack > trk.Sequence)
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sessions[s].StartTrack = trk.Sequence;
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if(sessions[s].EndTrack < trk.Sequence) sessions[s].EndTrack = trk.Sequence;
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if(sessions[s].StartSector > trk.StartSector) sessions[s].StartSector = trk.StartSector;
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if(sessions[s].EndSector < trk.Sectors + trk.StartSector - 1)
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sessions[s].EndSector = trk.Sectors + trk.StartSector - 1;
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}
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}
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discimage.Sessions.Add(sessions[0]);
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discimage.Sessions.Add(sessions[1]);
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discimage.Disktype = MediaType.GDROM;
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// DEBUG information
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DicConsole.DebugWriteLine("GDI plugin", "Disc image parsing results");
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DicConsole.DebugWriteLine("GDI plugin", "Session information:");
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DicConsole.DebugWriteLine("GDI plugin", "\tDisc contains {0} sessions", discimage.Sessions.Count);
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for(int i = 0; i < discimage.Sessions.Count; i++)
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{
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DicConsole.DebugWriteLine("GDI plugin", "\tSession {0} information:", i + 1);
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DicConsole.DebugWriteLine("GDI plugin", "\t\tStarting track: {0}",
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discimage.Sessions[i].StartTrack);
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DicConsole.DebugWriteLine("GDI plugin", "\t\tStarting sector: {0}",
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discimage.Sessions[i].StartSector);
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DicConsole.DebugWriteLine("GDI plugin", "\t\tEnding track: {0}", discimage.Sessions[i].EndTrack);
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DicConsole.DebugWriteLine("GDI plugin", "\t\tEnding sector: {0}", discimage.Sessions[i].EndSector);
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}
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DicConsole.DebugWriteLine("GDI plugin", "Track information:");
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DicConsole.DebugWriteLine("GDI plugin", "\tDisc contains {0} tracks", discimage.Tracks.Count);
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for(int i = 0; i < discimage.Tracks.Count; i++)
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{
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DicConsole.DebugWriteLine("GDI plugin", "\tTrack {0} information:", discimage.Tracks[i].Sequence);
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DicConsole.DebugWriteLine("GDI plugin", "\t\t{0} bytes per sector", discimage.Tracks[i].Bps);
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DicConsole.DebugWriteLine("GDI plugin", "\t\tPregap: {0} sectors", discimage.Tracks[i].Pregap);
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if((discimage.Tracks[i].Flags & 0x8) == 0x8)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is flagged as quadraphonic");
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if((discimage.Tracks[i].Flags & 0x4) == 0x4)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is data");
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if((discimage.Tracks[i].Flags & 0x2) == 0x2)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack allows digital copy");
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if((discimage.Tracks[i].Flags & 0x1) == 0x1)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack has pre-emphasis applied");
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DicConsole.DebugWriteLine("GDI plugin",
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"\t\tTrack resides in file {0}, type defined as {1}, starting at byte {2}",
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discimage.Tracks[i].Trackfilter, discimage.Tracks[i].Tracktype,
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discimage.Tracks[i].Offset);
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}
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DicConsole.DebugWriteLine("GDI plugin", "Building offset map");
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Partitions = new List<Partition>();
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ulong byteOffset = 0;
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for(int i = 0; i < discimage.Tracks.Count; i++)
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{
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if(discimage.Tracks[i].Sequence == 1 && i != 0)
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throw new ImageNotSupportedException("Unordered tracks");
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// Index 01
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Partition partition = new Partition
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{
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Description = $"Track {discimage.Tracks[i].Sequence}.",
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Name = null,
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Start = discimage.Tracks[i].StartSector,
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Size = discimage.Tracks[i].Sectors * discimage.Tracks[i].Bps,
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Length = discimage.Tracks[i].Sectors,
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Sequence = discimage.Tracks[i].Sequence,
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Offset = byteOffset,
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Type = discimage.Tracks[i].Tracktype.ToString()
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};
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byteOffset += partition.Size;
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offsetmap.Add(discimage.Tracks[i].Sequence, partition.Start);
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Partitions.Add(partition);
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}
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foreach(GdiTrack track in discimage.Tracks) imageInfo.ImageSize += track.Bps * track.Sectors;
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foreach(GdiTrack track in discimage.Tracks) imageInfo.Sectors += track.Sectors;
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imageInfo.Sectors += densitySeparationSectors;
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imageInfo.SectorSize = 2352; // All others
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foreach(GdiTrack unused in discimage.Tracks.Where(track => (track.Flags & 0x4) == 0x4 &&
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track.Bps == 2352))
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{
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEcc);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccP);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccQ);
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);
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}
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imageInfo.CreationTime = imageFilter.GetCreationTime();
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imageInfo.LastModificationTime = imageFilter.GetLastWriteTime();
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imageInfo.MediaType = discimage.Disktype;
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imageInfo.ReadableSectorTags.Add(SectorTagType.CdTrackFlags);
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imageInfo.XmlMediaType = XmlMediaType.OpticalDisc;
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DicConsole.VerboseWriteLine("GDI image describes a disc of type {0}", imageInfo.MediaType);
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return true;
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}
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catch(Exception ex)
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{
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DicConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter.GetBasePath());
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DicConsole.ErrorWriteLine("Exception: {0}", ex.Message);
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DicConsole.ErrorWriteLine("Stack trace: {0}", ex.StackTrace);
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return false;
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}
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}
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public byte[] ReadDiskTag(MediaTagType tag)
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{
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throw new FeatureSupportedButNotImplementedImageException("Feature not supported by image format");
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}
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public byte[] ReadSector(ulong sectorAddress)
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{
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return ReadSectors(sectorAddress, 1);
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}
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public byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
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{
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return ReadSectorsTag(sectorAddress, 1, tag);
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}
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public byte[] ReadSector(ulong sectorAddress, uint track)
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{
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return ReadSectors(sectorAddress, 1, track);
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}
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public byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
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{
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return ReadSectorsTag(sectorAddress, 1, track, tag);
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}
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public byte[] ReadSectors(ulong sectorAddress, uint length)
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{
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foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
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where sectorAddress >= kvp.Value
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from gdiTrack in discimage.Tracks
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where gdiTrack.Sequence == kvp.Key
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where sectorAddress - kvp.Value < gdiTrack.Sectors
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select kvp)
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return ReadSectors(sectorAddress - kvp.Value, length, kvp.Key);
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offsetmap.TryGetValue(0, out ulong transitionStart);
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if(sectorAddress >= transitionStart && sectorAddress < densitySeparationSectors + transitionStart)
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return ReadSectors(sectorAddress - transitionStart, length,
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0);
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throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
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}
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public byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
|
|
{
|
|
foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
|
|
where sectorAddress >= kvp.Value
|
|
from gdiTrack in discimage.Tracks
|
|
where gdiTrack.Sequence == kvp.Key
|
|
where sectorAddress - kvp.Value < gdiTrack.Sectors
|
|
select kvp)
|
|
return ReadSectorsTag(sectorAddress - kvp.Value, length, kvp.Key, tag);
|
|
|
|
offsetmap.TryGetValue(0, out ulong transitionStart);
|
|
if(sectorAddress >= transitionStart && sectorAddress < densitySeparationSectors + transitionStart)
|
|
return ReadSectorsTag(sectorAddress - transitionStart, length,
|
|
0, tag);
|
|
|
|
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
|
|
}
|
|
|
|
public byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
|
|
{
|
|
if(track == 0)
|
|
{
|
|
if(sectorAddress + length > densitySeparationSectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
return new byte[length * 2352];
|
|
}
|
|
|
|
GdiTrack dicTrack = new GdiTrack {Sequence = 0};
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
|
|
{
|
|
dicTrack = gdiTrack;
|
|
break;
|
|
}
|
|
|
|
if(dicTrack.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if(sectorAddress + length > dicTrack.Sectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(dicTrack.Tracktype)
|
|
{
|
|
case TrackType.Audio:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(dicTrack.Bps == 2352)
|
|
{
|
|
sectorOffset = 16;
|
|
sectorSize = 2048;
|
|
sectorSkip = 288;
|
|
}
|
|
else
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2048;
|
|
sectorSkip = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
|
|
}
|
|
|
|
byte[] buffer = new byte[sectorSize * length];
|
|
|
|
ulong remainingSectors = length;
|
|
|
|
if(dicTrack.Pregap > 0 && sectorAddress < dicTrack.Pregap)
|
|
{
|
|
ulong remainingPregap = dicTrack.Pregap - sectorAddress;
|
|
byte[] zero;
|
|
if(length > remainingPregap)
|
|
{
|
|
zero = new byte[remainingPregap * sectorSize];
|
|
remainingSectors -= remainingPregap;
|
|
}
|
|
else
|
|
{
|
|
zero = new byte[length * sectorSize];
|
|
remainingSectors -= length;
|
|
}
|
|
|
|
Array.Copy(zero, 0, buffer, 0, zero.Length);
|
|
}
|
|
|
|
if(remainingSectors == 0) return buffer;
|
|
|
|
imageStream = dicTrack.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(dicTrack.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + dicTrack.Pregap * dicTrack.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
byte[] sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
|
|
{
|
|
if(track == 0)
|
|
{
|
|
if(sectorAddress + length > densitySeparationSectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
if(tag == SectorTagType.CdTrackFlags) return new byte[] {0x00};
|
|
|
|
throw new ArgumentException("Unsupported tag requested for this track", nameof(tag));
|
|
}
|
|
|
|
GdiTrack dicTrack = new GdiTrack {Sequence = 0};
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
|
|
{
|
|
dicTrack = gdiTrack;
|
|
break;
|
|
}
|
|
|
|
if(dicTrack.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if(length > dicTrack.Sectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(tag)
|
|
{
|
|
case SectorTagType.CdSectorEcc:
|
|
case SectorTagType.CdSectorEccP:
|
|
case SectorTagType.CdSectorEccQ:
|
|
case SectorTagType.CdSectorEdc:
|
|
case SectorTagType.CdSectorHeader:
|
|
case SectorTagType.CdSectorSync: break;
|
|
case SectorTagType.CdTrackFlags:
|
|
{
|
|
byte[] flags = new byte[1];
|
|
|
|
flags[0] += dicTrack.Flags;
|
|
|
|
return flags;
|
|
}
|
|
default: throw new ArgumentException("Unsupported tag requested", nameof(tag));
|
|
}
|
|
|
|
switch(dicTrack.Tracktype)
|
|
{
|
|
case TrackType.Audio: throw new ArgumentException("There are no tags on audio tracks", nameof(tag));
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(dicTrack.Bps != 2352)
|
|
throw new FeatureNotPresentImageException("Image does not include tags for mode 1 sectors");
|
|
|
|
switch(tag)
|
|
{
|
|
case SectorTagType.CdSectorSync:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 12;
|
|
sectorSkip = 2340;
|
|
break;
|
|
}
|
|
case SectorTagType.CdSectorHeader:
|
|
{
|
|
sectorOffset = 12;
|
|
sectorSize = 4;
|
|
sectorSkip = 2336;
|
|
break;
|
|
}
|
|
case SectorTagType.CdSectorSubchannel:
|
|
case SectorTagType.CdSectorSubHeader:
|
|
throw new ArgumentException("Unsupported tag requested for this track", nameof(tag));
|
|
case SectorTagType.CdSectorEcc:
|
|
{
|
|
sectorOffset = 2076;
|
|
sectorSize = 276;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case SectorTagType.CdSectorEccP:
|
|
{
|
|
sectorOffset = 2076;
|
|
sectorSize = 172;
|
|
sectorSkip = 104;
|
|
break;
|
|
}
|
|
case SectorTagType.CdSectorEccQ:
|
|
{
|
|
sectorOffset = 2248;
|
|
sectorSize = 104;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case SectorTagType.CdSectorEdc:
|
|
{
|
|
sectorOffset = 2064;
|
|
sectorSize = 4;
|
|
sectorSkip = 284;
|
|
break;
|
|
}
|
|
default: throw new ArgumentException("Unsupported tag requested", nameof(tag));
|
|
}
|
|
|
|
break;
|
|
}
|
|
default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
|
|
}
|
|
|
|
byte[] buffer = new byte[sectorSize * length];
|
|
|
|
ulong remainingSectors = length;
|
|
|
|
if(dicTrack.Pregap > 0 && sectorAddress < dicTrack.Pregap)
|
|
{
|
|
ulong remainingPregap = dicTrack.Pregap - sectorAddress;
|
|
byte[] zero;
|
|
if(length > remainingPregap)
|
|
{
|
|
zero = new byte[remainingPregap * sectorSize];
|
|
remainingSectors -= remainingPregap;
|
|
}
|
|
else
|
|
{
|
|
zero = new byte[length * sectorSize];
|
|
remainingSectors -= length;
|
|
}
|
|
|
|
Array.Copy(zero, 0, buffer, 0, zero.Length);
|
|
}
|
|
|
|
if(remainingSectors == 0) return buffer;
|
|
|
|
imageStream = dicTrack.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(dicTrack.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + dicTrack.Pregap * dicTrack.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
byte[] sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public byte[] ReadSectorLong(ulong sectorAddress)
|
|
{
|
|
return ReadSectorsLong(sectorAddress, 1);
|
|
}
|
|
|
|
public byte[] ReadSectorLong(ulong sectorAddress, uint track)
|
|
{
|
|
return ReadSectorsLong(sectorAddress, 1, track);
|
|
}
|
|
|
|
public byte[] ReadSectorsLong(ulong sectorAddress, uint length)
|
|
{
|
|
foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
|
|
where sectorAddress >= kvp.Value
|
|
from gdiTrack in discimage.Tracks
|
|
where gdiTrack.Sequence == kvp.Key
|
|
where sectorAddress - kvp.Value < gdiTrack.Sectors
|
|
select kvp)
|
|
return ReadSectorsLong(sectorAddress - kvp.Value, length, kvp.Key);
|
|
|
|
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
|
|
}
|
|
|
|
public byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
|
|
{
|
|
if(track == 0)
|
|
{
|
|
if(sectorAddress + length > densitySeparationSectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
return new byte[length * 2352];
|
|
}
|
|
|
|
GdiTrack dicTrack = new GdiTrack {Sequence = 0};
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
|
|
{
|
|
dicTrack = gdiTrack;
|
|
break;
|
|
}
|
|
|
|
if(dicTrack.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if(sectorAddress + length > dicTrack.Sectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(dicTrack.Tracktype)
|
|
{
|
|
case TrackType.Audio:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(dicTrack.Bps == 2352)
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
}
|
|
else
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2048;
|
|
sectorSkip = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
|
|
}
|
|
|
|
byte[] buffer = new byte[sectorSize * length];
|
|
|
|
ulong remainingSectors = length;
|
|
|
|
if(dicTrack.Pregap > 0 && sectorAddress < dicTrack.Pregap)
|
|
{
|
|
ulong remainingPregap = dicTrack.Pregap - sectorAddress;
|
|
byte[] zero;
|
|
if(length > remainingPregap)
|
|
{
|
|
zero = new byte[remainingPregap * sectorSize];
|
|
remainingSectors -= remainingPregap;
|
|
}
|
|
else
|
|
{
|
|
zero = new byte[length * sectorSize];
|
|
remainingSectors -= length;
|
|
}
|
|
|
|
Array.Copy(zero, 0, buffer, 0, zero.Length);
|
|
}
|
|
|
|
if(remainingSectors == 0) return buffer;
|
|
|
|
imageStream = dicTrack.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(dicTrack.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + dicTrack.Pregap * dicTrack.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
byte[] sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public List<Track> GetSessionTracks(Session session)
|
|
{
|
|
if(discimage.Sessions.Contains(session)) return GetSessionTracks(session.SessionSequence);
|
|
|
|
throw new ImageNotSupportedException("Session does not exist in disc image");
|
|
}
|
|
|
|
public List<Track> GetSessionTracks(ushort session)
|
|
{
|
|
List<Track> tracks = new List<Track>();
|
|
bool expectedDensity;
|
|
|
|
switch(session)
|
|
{
|
|
case 1:
|
|
expectedDensity = false;
|
|
break;
|
|
case 2:
|
|
expectedDensity = true;
|
|
break;
|
|
default: throw new ImageNotSupportedException("Session does not exist in disc image");
|
|
}
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
if(gdiTrack.HighDensity == expectedDensity)
|
|
{
|
|
Track track = new Track
|
|
{
|
|
Indexes = new Dictionary<int, ulong>(),
|
|
TrackDescription = null,
|
|
TrackStartSector = gdiTrack.StartSector,
|
|
TrackPregap = gdiTrack.Pregap,
|
|
TrackSession = (ushort)(gdiTrack.HighDensity ? 2 : 1),
|
|
TrackSequence = gdiTrack.Sequence,
|
|
TrackType = gdiTrack.Tracktype,
|
|
TrackFilter = gdiTrack.Trackfilter,
|
|
TrackFile = gdiTrack.Trackfile,
|
|
TrackFileOffset = (ulong)gdiTrack.Offset,
|
|
TrackFileType = "BINARY",
|
|
TrackRawBytesPerSector = gdiTrack.Bps,
|
|
TrackBytesPerSector = gdiTrack.Tracktype == TrackType.Data ? 2048 : 2352,
|
|
TrackSubchannelType = TrackSubchannelType.None
|
|
};
|
|
|
|
track.TrackEndSector = track.TrackStartSector + gdiTrack.Sectors - 1;
|
|
|
|
tracks.Add(track);
|
|
}
|
|
|
|
return tracks;
|
|
}
|
|
|
|
public bool? VerifySector(ulong sectorAddress)
|
|
{
|
|
byte[] buffer = ReadSectorLong(sectorAddress);
|
|
return CdChecksums.CheckCdSector(buffer);
|
|
}
|
|
|
|
public bool? VerifySector(ulong sectorAddress, uint track)
|
|
{
|
|
byte[] buffer = ReadSectorLong(sectorAddress, track);
|
|
return CdChecksums.CheckCdSector(buffer);
|
|
}
|
|
|
|
public bool? VerifySectors(ulong sectorAddress, uint length, out List<ulong> failingLbas,
|
|
out List<ulong> unknownLbas)
|
|
{
|
|
byte[] buffer = ReadSectorsLong(sectorAddress, length);
|
|
int bps = (int)(buffer.Length / length);
|
|
byte[] sector = new byte[bps];
|
|
failingLbas = new List<ulong>();
|
|
unknownLbas = new List<ulong>();
|
|
|
|
for(int i = 0; i < length; i++)
|
|
{
|
|
Array.Copy(buffer, i * bps, sector, 0, bps);
|
|
bool? sectorStatus = CdChecksums.CheckCdSector(sector);
|
|
|
|
switch(sectorStatus)
|
|
{
|
|
case null:
|
|
unknownLbas.Add((ulong)i + sectorAddress);
|
|
break;
|
|
case false:
|
|
failingLbas.Add((ulong)i + sectorAddress);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(unknownLbas.Count > 0) return null;
|
|
|
|
return failingLbas.Count <= 0;
|
|
}
|
|
|
|
public bool? VerifySectors(ulong sectorAddress, uint length, uint track, out List<ulong> failingLbas,
|
|
out List<ulong> unknownLbas)
|
|
{
|
|
byte[] buffer = ReadSectorsLong(sectorAddress, length, track);
|
|
int bps = (int)(buffer.Length / length);
|
|
byte[] sector = new byte[bps];
|
|
failingLbas = new List<ulong>();
|
|
unknownLbas = new List<ulong>();
|
|
|
|
for(int i = 0; i < length; i++)
|
|
{
|
|
Array.Copy(buffer, i * bps, sector, 0, bps);
|
|
bool? sectorStatus = CdChecksums.CheckCdSector(sector);
|
|
|
|
switch(sectorStatus)
|
|
{
|
|
case null:
|
|
unknownLbas.Add((ulong)i + sectorAddress);
|
|
break;
|
|
case false:
|
|
failingLbas.Add((ulong)i + sectorAddress);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(unknownLbas.Count > 0) return null;
|
|
|
|
return failingLbas.Count <= 0;
|
|
}
|
|
|
|
public bool? VerifyMediaImage()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
struct GdiTrack
|
|
{
|
|
/// <summary>Track #</summary>
|
|
public uint Sequence;
|
|
/// <summary>Track filter</summary>
|
|
public IFilter Trackfilter;
|
|
/// <summary>Track file</summary>
|
|
public string Trackfile;
|
|
/// <summary>Track byte offset in file</summary>
|
|
public long Offset;
|
|
/// <summary>Track flags</summary>
|
|
public byte Flags;
|
|
/// <summary>Track starting sector</summary>
|
|
public ulong StartSector;
|
|
/// <summary>Bytes per sector</summary>
|
|
public ushort Bps;
|
|
/// <summary>Sectors in track</summary>
|
|
public ulong Sectors;
|
|
/// <summary>Track type</summary>
|
|
public TrackType Tracktype;
|
|
/// <summary>Track session</summary>
|
|
public bool HighDensity;
|
|
/// <summary>Pregap sectors not stored in track file</summary>
|
|
public ulong Pregap;
|
|
}
|
|
|
|
struct GdiDisc
|
|
{
|
|
/// <summary>Sessions</summary>
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public List<Session> Sessions;
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|
/// <summary>Tracks</summary>
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|
public List<GdiTrack> Tracks;
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|
/// <summary>Disk type</summary>
|
|
public MediaType Disktype;
|
|
}
|
|
}
|
|
} |