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924 lines
36 KiB
C#
924 lines
36 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Read.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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// Reads 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 © 2011-2021 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 Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.CommonTypes.Structs;
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using Aaru.Console;
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using Aaru.Decoders.CD;
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using Session = Aaru.CommonTypes.Structs.Session;
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namespace Aaru.DiscImages
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{
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public sealed partial class Gdi
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{
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/// <inheritdoc />
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public ErrorNumber Open(IFilter imageFilter)
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{
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if(imageFilter == null)
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return ErrorNumber.NoSuchFile;
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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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var 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
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{
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Sessions = new List<Session>(),
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Tracks = new List<GdiTrack>()
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};
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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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{
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AaruConsole.ErrorWriteLine("Not a correct Dreamcast GDI image");
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return ErrorNumber.InvalidArgument;
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}
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}
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else
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{
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Match trackMatch = regexTrack.Match(line ?? "");
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if(!trackMatch.Success)
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{
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AaruConsole.ErrorWriteLine($"Unknown line \"{line}\" at line {lineNumber}");
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return ErrorNumber.InvalidArgument;
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}
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AaruConsole.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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var filtersList = new FiltersList();
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var 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 = filtersList.GetFilter(Path.Combine(imageFilter.ParentFolder,
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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.Filename;
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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.DataForkLength - currentTrack.Offset) % currentTrack.Bps != 0)
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{
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AaruConsole.ErrorWriteLine("Track size not a multiple of sector size");
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return ErrorNumber.InvalidArgument;
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}
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currentTrack.Sectors = (ulong)((currentTrack.TrackFilter.DataForkLength - 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].Sequence = 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)
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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)
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sessions[s].EndTrack = trk.Sequence;
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if(sessions[s].StartSector > trk.StartSector)
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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].Sequence = 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)
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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)
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sessions[s].EndTrack = trk.Sequence;
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if(sessions[s].StartSector > trk.StartSector)
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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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AaruConsole.DebugWriteLine("GDI plugin", "Disc image parsing results");
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AaruConsole.DebugWriteLine("GDI plugin", "Session information:");
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AaruConsole.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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AaruConsole.DebugWriteLine("GDI plugin", "\tSession {0} information:", i + 1);
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tStarting track: {0}",
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_discImage.Sessions[i].StartTrack);
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tStarting sector: {0}",
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_discImage.Sessions[i].StartSector);
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tEnding track: {0}", _discImage.Sessions[i].EndTrack);
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tEnding sector: {0}",
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_discImage.Sessions[i].EndSector);
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}
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AaruConsole.DebugWriteLine("GDI plugin", "Track information:");
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AaruConsole.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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AaruConsole.DebugWriteLine("GDI plugin", "\tTrack {0} information:", _discImage.Tracks[i].Sequence);
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AaruConsole.DebugWriteLine("GDI plugin", "\t\t{0} bytes per sector", _discImage.Tracks[i].Bps);
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AaruConsole.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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AaruConsole.DebugWriteLine("GDI plugin", "\t\tTrack is flagged as quadraphonic");
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if((_discImage.Tracks[i].Flags & 0x4) == 0x4)
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tTrack is data");
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if((_discImage.Tracks[i].Flags & 0x2) == 0x2)
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tTrack allows digital copy");
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if((_discImage.Tracks[i].Flags & 0x1) == 0x1)
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AaruConsole.DebugWriteLine("GDI plugin", "\t\tTrack has pre-emphasis applied");
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AaruConsole.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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AaruConsole.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 &&
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i != 0)
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{
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AaruConsole.ErrorWriteLine("Unordered tracks");
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return ErrorNumber.InvalidArgument;
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}
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// Index 01
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var 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)
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_imageInfo.ImageSize += track.Bps * track.Sectors;
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foreach(GdiTrack track in _discImage.Tracks)
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_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.CreationTime;
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_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
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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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AaruConsole.VerboseWriteLine("GDI image describes a disc of type {0}", _imageInfo.MediaType);
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_sectorBuilder = new SectorBuilder();
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return ErrorNumber.NoError;
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}
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catch(Exception ex)
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{
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AaruConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter.BasePath);
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AaruConsole.ErrorWriteLine("Exception: {0}", ex);
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return ErrorNumber.UnexpectedException;
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}
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}
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/// <inheritdoc />
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public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer) =>
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ReadSectors(sectorAddress, 1, out buffer);
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/// <inheritdoc />
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public ErrorNumber ReadSectorTag(ulong sectorAddress, SectorTagType tag, out byte[] buffer) =>
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ReadSectorsTag(sectorAddress, 1, tag, out buffer);
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/// <inheritdoc />
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public ErrorNumber ReadSector(ulong sectorAddress, uint track, out byte[] buffer) =>
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ReadSectors(sectorAddress, 1, track, out buffer);
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/// <inheritdoc />
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public ErrorNumber ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag, out byte[] buffer) =>
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ReadSectorsTag(sectorAddress, 1, track, tag, out buffer);
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/// <inheritdoc />
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public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
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{
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buffer = null;
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foreach(KeyValuePair<uint, ulong> kvp in from kvp in _offsetMap 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 select kvp)
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return ReadSectors(sectorAddress - kvp.Value, length, kvp.Key, out buffer);
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_offsetMap.TryGetValue(0, out ulong transitionStart);
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if(sectorAddress < transitionStart ||
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sectorAddress >= _densitySeparationSectors + transitionStart)
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return ErrorNumber.SectorNotFound;
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return ReadSectors(sectorAddress - transitionStart, length, 0, out buffer);
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag, out byte[] buffer)
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{
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buffer = null;
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foreach(KeyValuePair<uint, ulong> kvp in from kvp in _offsetMap 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 select kvp)
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return ReadSectorsTag(sectorAddress - kvp.Value, length, kvp.Key, tag, out buffer);
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_offsetMap.TryGetValue(0, out ulong transitionStart);
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if(sectorAddress < transitionStart ||
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sectorAddress >= _densitySeparationSectors + transitionStart)
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return ErrorNumber.SectorNotFound;
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return ReadSectorsTag(sectorAddress - transitionStart, length, 0, tag, out buffer);
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectors(ulong sectorAddress, uint length, uint track, out byte[] buffer)
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{
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buffer = null;
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if(track == 0)
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{
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if(sectorAddress + length > _densitySeparationSectors)
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return ErrorNumber.OutOfRange;
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buffer = new byte[length * 2352];
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return ErrorNumber.NoError;
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}
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var aaruTrack = new GdiTrack
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{
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Sequence = 0
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};
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foreach(GdiTrack gdiTrack in _discImage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
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{
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aaruTrack = gdiTrack;
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break;
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}
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if(aaruTrack.Sequence == 0)
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return ErrorNumber.SectorNotFound;
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if(sectorAddress + length > aaruTrack.Sectors)
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return ErrorNumber.OutOfRange;
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uint sectorOffset;
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uint sectorSize;
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uint sectorSkip;
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switch(aaruTrack.TrackType)
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{
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case TrackType.Audio:
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{
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sectorOffset = 0;
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sectorSize = 2352;
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sectorSkip = 0;
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break;
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}
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case TrackType.CdMode1:
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{
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if(aaruTrack.Bps == 2352)
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{
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sectorOffset = 16;
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sectorSize = 2048;
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sectorSkip = 288;
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}
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else
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{
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sectorOffset = 0;
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sectorSize = 2048;
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sectorSkip = 0;
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}
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break;
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}
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default: return ErrorNumber.NotSupported;
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}
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buffer = new byte[sectorSize * length];
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ulong remainingSectors = length;
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if(aaruTrack.Pregap > 0 &&
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sectorAddress < aaruTrack.Pregap)
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{
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ulong remainingPregap = aaruTrack.Pregap - sectorAddress;
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remainingSectors -= length > remainingPregap ? remainingPregap : length;
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}
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if(remainingSectors == 0)
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return ErrorNumber.NoError;
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_imageStream = aaruTrack.TrackFilter.GetDataForkStream();
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var br = new BinaryReader(_imageStream);
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long pos = aaruTrack.Offset + (long)((sectorAddress * (sectorOffset + sectorSize + sectorSkip)) -
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(aaruTrack.Pregap * aaruTrack.Bps));
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if(pos < 0)
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pos = 0;
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br.BaseStream.Seek(pos, SeekOrigin.Begin);
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if(sectorOffset == 0 &&
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sectorSkip == 0 &&
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remainingSectors == length)
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buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
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else if(sectorOffset == 0 &&
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sectorSkip == 0)
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{
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byte[] tmp = br.ReadBytes((int)(sectorSize * remainingSectors));
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Array.Copy(tmp, 0, buffer, (int)((length - remainingSectors) * sectorSize), tmp.Length);
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}
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else
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{
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int bufferPos = (int)((length - remainingSectors) * sectorSize);
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for(ulong i = 0; i < remainingSectors; i++)
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{
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br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
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byte[] sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, bufferPos, sectorSize);
|
|
bufferPos += (int)sectorSize;
|
|
}
|
|
}
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag,
|
|
out byte[] buffer)
|
|
{
|
|
buffer = null;
|
|
|
|
if(tag == SectorTagType.CdTrackFlags)
|
|
track = (uint)sectorAddress;
|
|
|
|
if(track == 0)
|
|
{
|
|
if(sectorAddress + length > _densitySeparationSectors)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
if(tag != SectorTagType.CdTrackFlags)
|
|
return ErrorNumber.NotSupported;
|
|
|
|
buffer = new byte[]
|
|
{
|
|
0x00
|
|
};
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
var aaruTrack = new GdiTrack
|
|
{
|
|
Sequence = 0
|
|
};
|
|
|
|
foreach(GdiTrack gdiTrack in _discImage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
|
|
{
|
|
aaruTrack = gdiTrack;
|
|
|
|
break;
|
|
}
|
|
|
|
if(aaruTrack.Sequence == 0)
|
|
return ErrorNumber.SectorNotFound;
|
|
|
|
if(length > aaruTrack.Sectors)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
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:
|
|
{
|
|
buffer = new byte[1];
|
|
|
|
buffer[0] += aaruTrack.Flags;
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
default: return ErrorNumber.NotSupported;
|
|
}
|
|
|
|
switch(aaruTrack.TrackType)
|
|
{
|
|
case TrackType.Audio: return ErrorNumber.NoData;
|
|
case TrackType.CdMode1:
|
|
{
|
|
// TODO: Build
|
|
if(aaruTrack.Bps != 2352)
|
|
return ErrorNumber.NoData;
|
|
|
|
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: return ErrorNumber.NotSupported;
|
|
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: return ErrorNumber.NotSupported;
|
|
}
|
|
|
|
break;
|
|
}
|
|
default: return ErrorNumber.NotSupported;
|
|
}
|
|
|
|
buffer = new byte[sectorSize * length];
|
|
|
|
ulong remainingSectors = length;
|
|
|
|
if(aaruTrack.Pregap > 0 &&
|
|
sectorAddress < aaruTrack.Pregap)
|
|
{
|
|
ulong remainingPregap = aaruTrack.Pregap - sectorAddress;
|
|
|
|
remainingSectors -= length > remainingPregap ? remainingPregap : length;
|
|
}
|
|
|
|
if(remainingSectors == 0)
|
|
return ErrorNumber.NoError;
|
|
|
|
_imageStream = aaruTrack.TrackFilter.GetDataForkStream();
|
|
var br = new BinaryReader(_imageStream);
|
|
|
|
long pos = aaruTrack.Offset + (long)((sectorAddress * (sectorOffset + sectorSize + sectorSkip)) -
|
|
(aaruTrack.Pregap * aaruTrack.Bps));
|
|
|
|
if(pos < 0)
|
|
pos = 0;
|
|
|
|
br.BaseStream.Seek(pos, SeekOrigin.Begin);
|
|
|
|
if(sectorOffset == 0 &&
|
|
sectorSkip == 0 &&
|
|
remainingSectors == length)
|
|
buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else if(sectorOffset == 0 &&
|
|
sectorSkip == 0)
|
|
{
|
|
byte[] tmp = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
Array.Copy(tmp, 0, buffer, (int)((length - remainingSectors) * sectorSize), tmp.Length);
|
|
}
|
|
else
|
|
{
|
|
int bufferPos = (int)((length - remainingSectors) * sectorSize);
|
|
|
|
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, bufferPos, sectorSize);
|
|
bufferPos += (int)sectorSize;
|
|
}
|
|
}
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectorLong(ulong sectorAddress, out byte[] buffer) =>
|
|
ReadSectorsLong(sectorAddress, 1, out buffer);
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectorLong(ulong sectorAddress, uint track, out byte[] buffer) =>
|
|
ReadSectorsLong(sectorAddress, 1, track, out buffer);
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectorsLong(ulong sectorAddress, uint length, out byte[] buffer)
|
|
{
|
|
buffer = null;
|
|
|
|
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, out buffer);
|
|
|
|
return ErrorNumber.SectorNotFound;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectorsLong(ulong sectorAddress, uint length, uint track, out byte[] buffer)
|
|
{
|
|
buffer = null;
|
|
|
|
if(track == 0)
|
|
{
|
|
if(sectorAddress + length > _densitySeparationSectors)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
buffer = new byte[length * 2352];
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
var aaruTrack = new GdiTrack
|
|
{
|
|
Sequence = 0
|
|
};
|
|
|
|
foreach(GdiTrack gdiTrack in _discImage.Tracks.Where(gdiTrack => gdiTrack.Sequence == track))
|
|
{
|
|
aaruTrack = gdiTrack;
|
|
|
|
break;
|
|
}
|
|
|
|
if(aaruTrack.Sequence == 0)
|
|
return ErrorNumber.SectorNotFound;
|
|
|
|
if(sectorAddress + length > aaruTrack.Sectors)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(aaruTrack.TrackType)
|
|
{
|
|
case TrackType.Audio:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
|
|
break;
|
|
}
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(aaruTrack.Bps == 2352)
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
}
|
|
else
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2048;
|
|
sectorSkip = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
default: return ErrorNumber.NotSupported;
|
|
}
|
|
|
|
buffer = new byte[sectorSize * length];
|
|
|
|
ulong remainingSectors = length;
|
|
|
|
if(aaruTrack.Pregap > 0 &&
|
|
sectorAddress < aaruTrack.Pregap)
|
|
{
|
|
ulong remainingPregap = aaruTrack.Pregap - sectorAddress;
|
|
|
|
remainingSectors -= length > remainingPregap ? remainingPregap : length;
|
|
}
|
|
|
|
if(remainingSectors == 0)
|
|
return ErrorNumber.NoError;
|
|
|
|
_imageStream = aaruTrack.TrackFilter.GetDataForkStream();
|
|
var br = new BinaryReader(_imageStream);
|
|
|
|
long pos = aaruTrack.Offset + (long)((sectorAddress * (sectorOffset + sectorSize + sectorSkip)) -
|
|
(aaruTrack.Pregap * aaruTrack.Bps));
|
|
|
|
if(pos < 0)
|
|
pos = 0;
|
|
|
|
br.BaseStream.Seek(pos, SeekOrigin.Begin);
|
|
|
|
if(sectorOffset == 0 &&
|
|
sectorSkip == 0 &&
|
|
remainingSectors == length)
|
|
buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else if(sectorOffset == 0 &&
|
|
sectorSkip == 0)
|
|
{
|
|
byte[] tmp = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
Array.Copy(tmp, 0, buffer, (int)((length - remainingSectors) * sectorSize), tmp.Length);
|
|
}
|
|
else
|
|
{
|
|
int bufferPos = (int)((length - remainingSectors) * sectorSize);
|
|
|
|
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, bufferPos, sectorSize);
|
|
bufferPos += (int)sectorSize;
|
|
}
|
|
}
|
|
|
|
switch(aaruTrack.TrackType)
|
|
{
|
|
case TrackType.CdMode1 when aaruTrack.Bps == 2048:
|
|
{
|
|
byte[] fullSector = new byte[2352];
|
|
byte[] fullBuffer = new byte[2352 * length];
|
|
|
|
for(uint i = 0; i < length; i++)
|
|
{
|
|
Array.Copy(buffer, i * 2048, fullSector, 16, 2048);
|
|
_sectorBuilder.ReconstructPrefix(ref fullSector, TrackType.CdMode1, (long)(sectorAddress + i));
|
|
_sectorBuilder.ReconstructEcc(ref fullSector, TrackType.CdMode1);
|
|
Array.Copy(fullSector, 0, fullBuffer, i * 2352, 2352);
|
|
}
|
|
|
|
buffer = fullBuffer;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public List<Track> GetSessionTracks(Session session)
|
|
{
|
|
if(_discImage.Sessions.Contains(session))
|
|
return GetSessionTracks(session.Sequence);
|
|
|
|
return null;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public List<Track> GetSessionTracks(ushort session)
|
|
{
|
|
List<Track> tracks = new();
|
|
bool expectedDensity;
|
|
|
|
switch(session)
|
|
{
|
|
case 1:
|
|
expectedDensity = false;
|
|
|
|
break;
|
|
case 2:
|
|
expectedDensity = true;
|
|
|
|
break;
|
|
default: return null;
|
|
}
|
|
|
|
foreach(GdiTrack gdiTrack in _discImage.Tracks)
|
|
if(gdiTrack.HighDensity == expectedDensity)
|
|
{
|
|
var track = new Track
|
|
{
|
|
Description = null,
|
|
StartSector = gdiTrack.StartSector,
|
|
Pregap = gdiTrack.Pregap,
|
|
Session = (ushort)(gdiTrack.HighDensity ? 2 : 1),
|
|
Sequence = gdiTrack.Sequence,
|
|
Type = gdiTrack.TrackType,
|
|
Filter = gdiTrack.TrackFilter,
|
|
File = gdiTrack.TrackFile,
|
|
FileOffset = (ulong)gdiTrack.Offset,
|
|
FileType = "BINARY",
|
|
RawBytesPerSector = gdiTrack.Bps,
|
|
BytesPerSector = gdiTrack.TrackType == TrackType.Data ? 2048 : 2352,
|
|
SubchannelType = TrackSubchannelType.None
|
|
};
|
|
|
|
track.EndSector = track.StartSector + gdiTrack.Sectors - 1;
|
|
|
|
tracks.Add(track);
|
|
}
|
|
|
|
return tracks;
|
|
}
|
|
}
|
|
} |