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1237 lines
48 KiB
C#
1237 lines
48 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.Text.RegularExpressions;
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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 : ImagePlugin
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{
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#region Internal structures
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struct GdiTrack
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{
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/// <summary>Track #</summary>
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public uint Sequence;
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/// <summary>Track filter</summary>
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public Filter Trackfilter;
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/// <summary>Track file</summary>
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public string Trackfile;
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/// <summary>Track byte offset in file</summary>
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public long Offset;
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/// <summary>Track flags</summary>
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public byte Flags;
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/// <summary>Track starting sector</summary>
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public ulong StartSector;
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/// <summary>Bytes per sector</summary>
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public ushort Bps;
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/// <summary>Sectors in track</summary>
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public ulong Sectors;
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/// <summary>Track type</summary>
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public TrackType Tracktype;
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/// <summary>Track session</summary>
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public bool HighDensity;
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/// <summary>Pregap sectors not stored in track file</summary>
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public ulong Pregap;
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}
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struct GdiDisc
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{
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/// <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>
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public MediaType Disktype;
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}
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#endregion Internal structures
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#region Internal variables
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StreamReader gdiStream;
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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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GdiDisc discimage;
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List<Partition> partitions;
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ulong densitySeparationSectors;
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#endregion Internal variables
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#region Parsing regexs
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const string TRACK_REGEX =
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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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;
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#endregion Parsing regexs
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#region Public methods
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public Gdi()
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{
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Name = "Dreamcast GDI image";
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PluginUuid = new Guid("281ECBF2-D2A7-414C-8497-1A33F6DCB2DD");
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ImageInfo = new ImageInfo();
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ImageInfo.ReadableSectorTags = new List<SectorTagType>();
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ImageInfo.ReadableMediaTags = new List<MediaTagType>();
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ImageInfo.ImageHasPartitions = true;
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ImageInfo.ImageHasSessions = true;
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ImageInfo.ImageVersion = null;
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ImageInfo.ImageApplicationVersion = null;
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ImageInfo.ImageName = null;
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ImageInfo.ImageCreator = null;
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ImageInfo.MediaManufacturer = null;
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ImageInfo.MediaModel = null;
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ImageInfo.MediaPartNumber = null;
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ImageInfo.MediaSequence = 0;
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ImageInfo.LastMediaSequence = 0;
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ImageInfo.DriveManufacturer = null;
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ImageInfo.DriveModel = null;
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ImageInfo.DriveSerialNumber = null;
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ImageInfo.DriveFirmwareRevision = null;
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}
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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 override bool IdentifyImage(Filter 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 line = 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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line++;
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string _line = gdiStream.ReadLine();
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if(line == 1) { if(!int.TryParse(_line, out tracks)) return false; }
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else
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{
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Regex regexTrack = new Regex(TRACK_REGEX);
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Match trackMatch = regexTrack.Match(_line);
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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 override bool OpenImage(Filter 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 line = 0;
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int tracksFound = 0;
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int tracks = 0;
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bool highDensity = false;
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// Initialize all RegExs
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Regex regexTrack = new Regex(TRACK_REGEX);
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// Initialize all RegEx matches
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Match trackMatch;
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// Initialize disc
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discimage = new GdiDisc();
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discimage.Sessions = new List<Session>();
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discimage.Tracks = new List<GdiTrack>();
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ulong currentStart = 0;
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offsetmap = new Dictionary<uint, ulong>();
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GdiTrack currentTrack;
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densitySeparationSectors = 0;
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FiltersList filtersList;
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while(gdiStream.Peek() >= 0)
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{
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line++;
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string _line = gdiStream.ReadLine();
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if(line == 1)
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{
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if(!int.TryParse(_line, out tracks))
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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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trackMatch = regexTrack.Match(_line);
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if(!trackMatch.Success)
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throw new ImageNotSupportedException(string.Format("Unknown line \"{0}\" at line {1}",
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_line, line));
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tracksFound++;
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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, line);
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filtersList = new FiltersList();
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currentTrack = new GdiTrack();
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currentTrack.Bps = ushort.Parse(trackMatch.Groups["type"].Value);
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currentTrack.Flags = (byte)(byte.Parse(trackMatch.Groups["flags"].Value) * 0x10);
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currentTrack.Offset = long.Parse(trackMatch.Groups["offset"].Value);
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currentTrack.Sequence = uint.Parse(trackMatch.Groups["track"].Value);
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currentTrack.StartSector = ulong.Parse(trackMatch.Groups["start"].Value);
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currentTrack.Trackfilter =
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filtersList.GetFilter(Path.Combine(imageFilter.GetParentFolder(),
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trackMatch.Groups["filename"].Value.Replace("\\\"", "\"")
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.Trim(new[] {'"'})));
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currentTrack.Trackfile = currentTrack.Trackfilter.GetFilename();
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if((currentTrack.StartSector - currentStart) > 0)
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{
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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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}
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if(((currentTrack.Trackfilter.GetDataForkLength() - currentTrack.Offset) % currentTrack.Bps) !=
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0) 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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if((currentTrack.Flags & 0x40) == 0x40) currentTrack.Tracktype = TrackType.CdMode1;
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else currentTrack.Tracktype = 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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{
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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)
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{
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if(!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) _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)
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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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}
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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)
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{
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if(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) _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)
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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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}
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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 & 0x80) == 0x80)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is flagged as quadraphonic");
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if((discimage.Tracks[i].Flags & 0x40) == 0x40)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is data");
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if((discimage.Tracks[i].Flags & 0x20) == 0x20)
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DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack allows digital copy");
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if((discimage.Tracks[i].Flags & 0x10) == 0x10)
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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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Partition partition = new Partition();
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// Index 01
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partition.Description = string.Format("Track {0}.", discimage.Tracks[i].Sequence);
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partition.Name = null;
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partition.Start = discimage.Tracks[i].StartSector;
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partition.Size = discimage.Tracks[i].Sectors * discimage.Tracks[i].Bps;
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partition.Length = discimage.Tracks[i].Sectors;
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partition.Sequence = discimage.Tracks[i].Sequence;
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partition.Offset = byteOffset;
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partition.Type = discimage.Tracks[i].Tracktype.ToString();
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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 track in discimage.Tracks)
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{
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if((track.Flags & 0x40) == 0x40 && 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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}
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ImageInfo.ImageCreationTime = imageFilter.GetCreationTime();
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ImageInfo.ImageLastModificationTime = 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 override bool ImageHasPartitions()
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{
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return ImageInfo.ImageHasPartitions;
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}
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public override ulong GetImageSize()
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{
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return ImageInfo.ImageSize;
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}
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public override ulong GetSectors()
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{
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return ImageInfo.Sectors;
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}
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public override uint GetSectorSize()
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{
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return ImageInfo.SectorSize;
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}
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public override 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 override 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 override 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 override byte[] ReadSector(ulong sectorAddress, uint track)
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|
{
|
|
return ReadSectors(sectorAddress, 1, track);
|
|
}
|
|
|
|
public override byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
|
|
{
|
|
return ReadSectorsTag(sectorAddress, 1, track, tag);
|
|
}
|
|
|
|
public override byte[] ReadSectors(ulong sectorAddress, uint length)
|
|
{
|
|
foreach(KeyValuePair<uint, ulong> kvp in offsetmap)
|
|
{
|
|
if(sectorAddress >= kvp.Value)
|
|
{
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == kvp.Key)
|
|
{
|
|
if((sectorAddress - kvp.Value) < gdiTrack.Sectors)
|
|
return ReadSectors((sectorAddress - kvp.Value), length, kvp.Key);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ulong transitionStart;
|
|
offsetmap.TryGetValue(0, out transitionStart);
|
|
if(sectorAddress >= transitionStart && sectorAddress < (densitySeparationSectors + transitionStart))
|
|
return ReadSectors((sectorAddress - transitionStart), length, 0);
|
|
|
|
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
|
|
}
|
|
|
|
public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
|
|
{
|
|
foreach(KeyValuePair<uint, ulong> kvp in offsetmap)
|
|
{
|
|
if(sectorAddress >= kvp.Value)
|
|
{
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == kvp.Key)
|
|
{
|
|
if((sectorAddress - kvp.Value) < gdiTrack.Sectors)
|
|
return ReadSectorsTag((sectorAddress - kvp.Value), length, kvp.Key, tag);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ulong transitionStart;
|
|
offsetmap.TryGetValue(0, out transitionStart);
|
|
if(sectorAddress >= transitionStart && sectorAddress < (densitySeparationSectors + transitionStart))
|
|
return ReadSectorsTag((sectorAddress - transitionStart), length, 0, tag);
|
|
|
|
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
|
|
}
|
|
|
|
public override 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 _track = new GdiTrack();
|
|
|
|
_track.Sequence = 0;
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == track)
|
|
{
|
|
_track = gdiTrack;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(_track.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if((sectorAddress + length) > _track.Sectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(_track.Tracktype)
|
|
{
|
|
case TrackType.Audio:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(_track.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(_track.Pregap > 0 && sectorAddress < _track.Pregap)
|
|
{
|
|
ulong remainingPregap = _track.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 = _track.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(_track.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + _track.Pregap * _track.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
{
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
byte[] sector;
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public override 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 _track = new GdiTrack();
|
|
|
|
_track.Sequence = 0;
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == track)
|
|
{
|
|
_track = gdiTrack;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(_track.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if(length > _track.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] += _track.Flags;
|
|
|
|
return flags;
|
|
}
|
|
default: throw new ArgumentException("Unsupported tag requested", nameof(tag));
|
|
}
|
|
|
|
switch(_track.Tracktype)
|
|
{
|
|
case TrackType.Audio: throw new ArgumentException("There are no tags on audio tracks", nameof(tag));
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(_track.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(_track.Pregap > 0 && sectorAddress < _track.Pregap)
|
|
{
|
|
ulong remainingPregap = _track.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 = _track.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(_track.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + _track.Pregap * _track.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
{
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
byte[] sector;
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public override byte[] ReadSectorLong(ulong sectorAddress)
|
|
{
|
|
return ReadSectorsLong(sectorAddress, 1);
|
|
}
|
|
|
|
public override byte[] ReadSectorLong(ulong sectorAddress, uint track)
|
|
{
|
|
return ReadSectorsLong(sectorAddress, 1, track);
|
|
}
|
|
|
|
public override byte[] ReadSectorsLong(ulong sectorAddress, uint length)
|
|
{
|
|
foreach(KeyValuePair<uint, ulong> kvp in offsetmap)
|
|
{
|
|
if(sectorAddress >= kvp.Value)
|
|
{
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == kvp.Key)
|
|
{
|
|
if((sectorAddress - kvp.Value) < gdiTrack.Sectors)
|
|
return ReadSectorsLong((sectorAddress - kvp.Value), length, kvp.Key);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
|
|
}
|
|
|
|
public override 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 _track = new GdiTrack();
|
|
|
|
_track.Sequence = 0;
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
if(gdiTrack.Sequence == track)
|
|
{
|
|
_track = gdiTrack;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(_track.Sequence == 0)
|
|
throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");
|
|
|
|
if((sectorAddress + length) > _track.Sectors)
|
|
throw new ArgumentOutOfRangeException(nameof(length),
|
|
"Requested more sectors than present in track, won't cross tracks");
|
|
|
|
uint sectorOffset;
|
|
uint sectorSize;
|
|
uint sectorSkip;
|
|
|
|
switch(_track.Tracktype)
|
|
{
|
|
case TrackType.Audio:
|
|
{
|
|
sectorOffset = 0;
|
|
sectorSize = 2352;
|
|
sectorSkip = 0;
|
|
break;
|
|
}
|
|
case TrackType.CdMode1:
|
|
{
|
|
if(_track.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(_track.Pregap > 0 && sectorAddress < _track.Pregap)
|
|
{
|
|
ulong remainingPregap = _track.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 = _track.Trackfilter.GetDataForkStream();
|
|
BinaryReader br = new BinaryReader(imageStream);
|
|
br.BaseStream
|
|
.Seek(_track.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip) + _track.Pregap * _track.Bps),
|
|
SeekOrigin.Begin);
|
|
if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * remainingSectors));
|
|
else
|
|
{
|
|
for(ulong i = 0; i < remainingSectors; i++)
|
|
{
|
|
byte[] sector;
|
|
br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
|
|
sector = br.ReadBytes((int)sectorSize);
|
|
br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
|
|
Array.Copy(sector, 0, buffer, (int)(i * sectorSize), sectorSize);
|
|
}
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public override string GetImageFormat()
|
|
{
|
|
return "Dreamcast GDI image";
|
|
}
|
|
|
|
public override string GetImageVersion()
|
|
{
|
|
return ImageInfo.ImageVersion;
|
|
}
|
|
|
|
public override string GetImageApplication()
|
|
{
|
|
return ImageInfo.ImageApplication;
|
|
}
|
|
|
|
public override string GetImageApplicationVersion()
|
|
{
|
|
return ImageInfo.ImageApplicationVersion;
|
|
}
|
|
|
|
public override DateTime GetImageCreationTime()
|
|
{
|
|
return ImageInfo.ImageCreationTime;
|
|
}
|
|
|
|
public override DateTime GetImageLastModificationTime()
|
|
{
|
|
return ImageInfo.ImageLastModificationTime;
|
|
}
|
|
|
|
public override string GetImageComments()
|
|
{
|
|
return ImageInfo.ImageComments;
|
|
}
|
|
|
|
public override string GetMediaSerialNumber()
|
|
{
|
|
return ImageInfo.MediaSerialNumber;
|
|
}
|
|
|
|
public override string GetMediaBarcode()
|
|
{
|
|
return ImageInfo.MediaBarcode;
|
|
}
|
|
|
|
public override MediaType GetMediaType()
|
|
{
|
|
return ImageInfo.MediaType;
|
|
}
|
|
|
|
public override List<Partition> GetPartitions()
|
|
{
|
|
return partitions;
|
|
}
|
|
|
|
public override List<Track> GetTracks()
|
|
{
|
|
List<Track> tracks = new List<Track>();
|
|
|
|
foreach(GdiTrack gdiTrack in discimage.Tracks)
|
|
{
|
|
Track _track = new Track();
|
|
|
|
_track.Indexes = new Dictionary<int, ulong>();
|
|
_track.TrackDescription = null;
|
|
_track.TrackStartSector = gdiTrack.StartSector;
|
|
_track.TrackEndSector = _track.TrackStartSector + gdiTrack.Sectors - 1;
|
|
_track.TrackPregap = gdiTrack.Pregap;
|
|
if(gdiTrack.HighDensity) _track.TrackSession = 2;
|
|
else _track.TrackSession = 1;
|
|
_track.TrackSequence = gdiTrack.Sequence;
|
|
_track.TrackType = gdiTrack.Tracktype;
|
|
_track.TrackFilter = gdiTrack.Trackfilter;
|
|
_track.TrackFile = gdiTrack.Trackfile;
|
|
_track.TrackFileOffset = (ulong)gdiTrack.Offset;
|
|
_track.TrackFileType = "BINARY";
|
|
_track.TrackRawBytesPerSector = gdiTrack.Bps;
|
|
if(gdiTrack.Tracktype == TrackType.Data) _track.TrackBytesPerSector = 2048;
|
|
else _track.TrackBytesPerSector = 2352;
|
|
_track.TrackSubchannelType = TrackSubchannelType.None;
|
|
|
|
tracks.Add(_track);
|
|
}
|
|
|
|
return tracks;
|
|
}
|
|
|
|
public override 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 override 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();
|
|
|
|
_track.Indexes = new Dictionary<int, ulong>();
|
|
_track.TrackDescription = null;
|
|
_track.TrackStartSector = gdiTrack.StartSector;
|
|
_track.TrackEndSector = _track.TrackStartSector + gdiTrack.Sectors - 1;
|
|
_track.TrackPregap = gdiTrack.Pregap;
|
|
if(gdiTrack.HighDensity) _track.TrackSession = 2;
|
|
else _track.TrackSession = 1;
|
|
_track.TrackSequence = gdiTrack.Sequence;
|
|
_track.TrackType = gdiTrack.Tracktype;
|
|
_track.TrackFilter = gdiTrack.Trackfilter;
|
|
_track.TrackFile = gdiTrack.Trackfile;
|
|
_track.TrackFileOffset = (ulong)gdiTrack.Offset;
|
|
_track.TrackFileType = "BINARY";
|
|
_track.TrackRawBytesPerSector = gdiTrack.Bps;
|
|
if(gdiTrack.Tracktype == TrackType.Data) _track.TrackBytesPerSector = 2048;
|
|
else _track.TrackBytesPerSector = 2352;
|
|
_track.TrackSubchannelType = TrackSubchannelType.None;
|
|
|
|
tracks.Add(_track);
|
|
}
|
|
}
|
|
|
|
return tracks;
|
|
}
|
|
|
|
public override List<Session> GetSessions()
|
|
{
|
|
return discimage.Sessions;
|
|
}
|
|
|
|
public override bool? VerifySector(ulong sectorAddress)
|
|
{
|
|
byte[] buffer = ReadSectorLong(sectorAddress);
|
|
return Checksums.CdChecksums.CheckCdSector(buffer);
|
|
}
|
|
|
|
public override bool? VerifySector(ulong sectorAddress, uint track)
|
|
{
|
|
byte[] buffer = ReadSectorLong(sectorAddress, track);
|
|
return Checksums.CdChecksums.CheckCdSector(buffer);
|
|
}
|
|
|
|
public override 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 = Checksums.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;
|
|
if(failingLbas.Count > 0) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
public override 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 = Checksums.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;
|
|
if(failingLbas.Count > 0) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
public override bool? VerifyMediaImage()
|
|
{
|
|
return null;
|
|
}
|
|
#endregion Public methods
|
|
|
|
#region Unsupported features
|
|
public override int GetMediaSequence()
|
|
{
|
|
return ImageInfo.MediaSequence;
|
|
}
|
|
|
|
public override int GetLastDiskSequence()
|
|
{
|
|
return ImageInfo.LastMediaSequence;
|
|
}
|
|
|
|
public override string GetDriveManufacturer()
|
|
{
|
|
return ImageInfo.DriveManufacturer;
|
|
}
|
|
|
|
public override string GetDriveModel()
|
|
{
|
|
return ImageInfo.DriveModel;
|
|
}
|
|
|
|
public override string GetDriveSerialNumber()
|
|
{
|
|
return ImageInfo.DriveSerialNumber;
|
|
}
|
|
|
|
public override string GetMediaPartNumber()
|
|
{
|
|
return ImageInfo.MediaPartNumber;
|
|
}
|
|
|
|
public override string GetMediaManufacturer()
|
|
{
|
|
return ImageInfo.MediaManufacturer;
|
|
}
|
|
|
|
public override string GetMediaModel()
|
|
{
|
|
return ImageInfo.MediaModel;
|
|
}
|
|
|
|
public override string GetImageName()
|
|
{
|
|
return ImageInfo.ImageName;
|
|
}
|
|
|
|
public override string GetImageCreator()
|
|
{
|
|
return ImageInfo.ImageCreator;
|
|
}
|
|
#endregion Unsupported features
|
|
}
|
|
} |