Files
Aaru/DiscImageChef.DiscImages/GDI.cs

1237 lines
48 KiB
C#

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename : GDI.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disc image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Manages Dreamcast GDI disc images.
//
// --[ License ] --------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2018 Natalia Portillo
// ****************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using DiscImageChef.CommonTypes;
using DiscImageChef.Console;
using DiscImageChef.Filters;
namespace DiscImageChef.DiscImages
{
// 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
// TODO: This format doesn't support to specify pregaps that are included in the file (like Redump ones)
public class Gdi : ImagePlugin
{
#region Internal structures
struct GdiTrack
{
/// <summary>Track #</summary>
public uint Sequence;
/// <summary>Track filter</summary>
public Filter Trackfilter;
/// <summary>Track file</summary>
public string Trackfile;
/// <summary>Track byte offset in file</summary>
public long Offset;
/// <summary>Track flags</summary>
public byte Flags;
/// <summary>Track starting sector</summary>
public ulong StartSector;
/// <summary>Bytes per sector</summary>
public ushort Bps;
/// <summary>Sectors in track</summary>
public ulong Sectors;
/// <summary>Track type</summary>
public TrackType Tracktype;
/// <summary>Track session</summary>
public bool HighDensity;
/// <summary>Pregap sectors not stored in track file</summary>
public ulong Pregap;
}
struct GdiDisc
{
/// <summary>Sessions</summary>
public List<Session> Sessions;
/// <summary>Tracks</summary>
public List<GdiTrack> Tracks;
/// <summary>Disk type</summary>
public MediaType Disktype;
}
#endregion Internal structures
#region Internal variables
StreamReader gdiStream;
Stream imageStream;
/// <summary>Dictionary, index is track #, value is track number, or 0 if a TOC</summary>
Dictionary<uint, ulong> offsetmap;
GdiDisc discimage;
List<Partition> partitions;
ulong densitySeparationSectors;
#endregion Internal variables
#region Parsing regexs
const string TRACK_REGEX =
"\\s?(?<track>\\d+)\\s+(?<start>\\d+)\\s(?<flags>\\d)\\s(?<type>2352|2048)\\s(?<filename>.+)\\s(?<offset>\\d+)$"
;
#endregion Parsing regexs
#region Public methods
public Gdi()
{
Name = "Dreamcast GDI image";
PluginUuid = new Guid("281ECBF2-D2A7-414C-8497-1A33F6DCB2DD");
ImageInfo = new ImageInfo();
ImageInfo.ReadableSectorTags = new List<SectorTagType>();
ImageInfo.ReadableMediaTags = new List<MediaTagType>();
ImageInfo.ImageHasPartitions = true;
ImageInfo.ImageHasSessions = true;
ImageInfo.ImageVersion = null;
ImageInfo.ImageApplicationVersion = null;
ImageInfo.ImageName = null;
ImageInfo.ImageCreator = null;
ImageInfo.MediaManufacturer = null;
ImageInfo.MediaModel = null;
ImageInfo.MediaPartNumber = null;
ImageInfo.MediaSequence = 0;
ImageInfo.LastMediaSequence = 0;
ImageInfo.DriveManufacturer = null;
ImageInfo.DriveModel = null;
ImageInfo.DriveSerialNumber = null;
ImageInfo.DriveFirmwareRevision = null;
}
// Due to .gdi format, this method must parse whole file, ignoring errors (those will be thrown by OpenImage()).
public override bool IdentifyImage(Filter imageFilter)
{
try
{
imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
byte[] testArray = new byte[512];
imageFilter.GetDataForkStream().Read(testArray, 0, 512);
imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
// Check for unexpected control characters that shouldn't be present in a text file and can crash this plugin
bool twoConsecutiveNulls = false;
for(int i = 0; i < 512; i++)
{
if(i >= imageFilter.GetDataForkStream().Length) break;
if(testArray[i] == 0)
{
if(twoConsecutiveNulls) return false;
twoConsecutiveNulls = true;
}
else twoConsecutiveNulls = false;
if(testArray[i] < 0x20 && testArray[i] != 0x0A && testArray[i] != 0x0D && testArray[i] != 0x00)
return false;
}
gdiStream = new StreamReader(imageFilter.GetDataForkStream());
int line = 0;
int tracksFound = 0;
int tracks = 0;
while(gdiStream.Peek() >= 0)
{
line++;
string _line = gdiStream.ReadLine();
if(line == 1) { if(!int.TryParse(_line, out tracks)) return false; }
else
{
Regex regexTrack = new Regex(TRACK_REGEX);
Match trackMatch = regexTrack.Match(_line);
if(!trackMatch.Success) return false;
tracksFound++;
}
}
if(tracks == 0) return false;
return tracks == tracksFound;
}
catch(Exception ex)
{
DicConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter.GetBasePath());
DicConsole.ErrorWriteLine("Exception: {0}", ex.Message);
DicConsole.ErrorWriteLine("Stack trace: {0}", ex.StackTrace);
return false;
}
}
public override bool OpenImage(Filter imageFilter)
{
if(imageFilter == null) return false;
try
{
imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
gdiStream = new StreamReader(imageFilter.GetDataForkStream());
int line = 0;
int tracksFound = 0;
int tracks = 0;
bool highDensity = false;
// Initialize all RegExs
Regex regexTrack = new Regex(TRACK_REGEX);
// Initialize all RegEx matches
Match trackMatch;
// Initialize disc
discimage = new GdiDisc();
discimage.Sessions = new List<Session>();
discimage.Tracks = new List<GdiTrack>();
ulong currentStart = 0;
offsetmap = new Dictionary<uint, ulong>();
GdiTrack currentTrack;
densitySeparationSectors = 0;
FiltersList filtersList;
while(gdiStream.Peek() >= 0)
{
line++;
string _line = gdiStream.ReadLine();
if(line == 1)
{
if(!int.TryParse(_line, out tracks))
throw new ImageNotSupportedException("Not a correct Dreamcast GDI image");
}
else
{
trackMatch = regexTrack.Match(_line);
if(!trackMatch.Success)
throw new ImageNotSupportedException(string.Format("Unknown line \"{0}\" at line {1}",
_line, line));
tracksFound++;
DicConsole.DebugWriteLine("GDI plugin",
"Found track {0} starts at {1} flags {2} type {3} file {4} offset {5} at line {6}",
trackMatch.Groups["track"].Value, trackMatch.Groups["start"].Value,
trackMatch.Groups["flags"].Value, trackMatch.Groups["type"].Value,
trackMatch.Groups["filename"].Value,
trackMatch.Groups["offset"].Value, line);
filtersList = new FiltersList();
currentTrack = new GdiTrack();
currentTrack.Bps = ushort.Parse(trackMatch.Groups["type"].Value);
currentTrack.Flags = (byte)(byte.Parse(trackMatch.Groups["flags"].Value) * 0x10);
currentTrack.Offset = long.Parse(trackMatch.Groups["offset"].Value);
currentTrack.Sequence = uint.Parse(trackMatch.Groups["track"].Value);
currentTrack.StartSector = ulong.Parse(trackMatch.Groups["start"].Value);
currentTrack.Trackfilter =
filtersList.GetFilter(Path.Combine(imageFilter.GetParentFolder(),
trackMatch.Groups["filename"].Value.Replace("\\\"", "\"")
.Trim(new[] {'"'})));
currentTrack.Trackfile = currentTrack.Trackfilter.GetFilename();
if((currentTrack.StartSector - currentStart) > 0)
{
if(currentTrack.StartSector == 45000)
{
highDensity = true;
offsetmap.Add(0, currentStart);
densitySeparationSectors = (currentTrack.StartSector - currentStart);
currentStart = currentTrack.StartSector;
}
else
{
currentTrack.Pregap = (currentTrack.StartSector - currentStart);
currentTrack.StartSector -= (currentTrack.StartSector - currentStart);
}
}
if(((currentTrack.Trackfilter.GetDataForkLength() - currentTrack.Offset) % currentTrack.Bps) !=
0) throw new ImageNotSupportedException("Track size not a multiple of sector size");
currentTrack.Sectors =
(ulong)((currentTrack.Trackfilter.GetDataForkLength() - currentTrack.Offset) /
currentTrack.Bps);
currentTrack.Sectors += currentTrack.Pregap;
currentStart += currentTrack.Sectors;
currentTrack.HighDensity = highDensity;
if((currentTrack.Flags & 0x40) == 0x40) currentTrack.Tracktype = TrackType.CdMode1;
else currentTrack.Tracktype = TrackType.Audio;
discimage.Tracks.Add(currentTrack);
}
}
Session[] _sessions = new Session[2];
for(int s = 0; s < _sessions.Length; s++)
{
if(s == 0)
{
_sessions[s].SessionSequence = 1;
foreach(GdiTrack trk in discimage.Tracks)
{
if(!trk.HighDensity)
{
if(_sessions[s].StartTrack == 0) _sessions[s].StartTrack = trk.Sequence;
else if(_sessions[s].StartTrack > trk.Sequence) _sessions[s].StartTrack = trk.Sequence;
if(_sessions[s].EndTrack < trk.Sequence) _sessions[s].EndTrack = trk.Sequence;
if(_sessions[s].StartSector > trk.StartSector)
_sessions[s].StartSector = trk.StartSector;
if(_sessions[s].EndSector < (trk.Sectors + trk.StartSector - 1))
_sessions[s].EndSector = trk.Sectors + trk.StartSector - 1;
}
}
}
else
{
_sessions[s].SessionSequence = 2;
foreach(GdiTrack trk in discimage.Tracks)
{
if(trk.HighDensity)
{
if(_sessions[s].StartTrack == 0) _sessions[s].StartTrack = trk.Sequence;
else if(_sessions[s].StartTrack > trk.Sequence) _sessions[s].StartTrack = trk.Sequence;
if(_sessions[s].EndTrack < trk.Sequence) _sessions[s].EndTrack = trk.Sequence;
if(_sessions[s].StartSector > trk.StartSector)
_sessions[s].StartSector = trk.StartSector;
if(_sessions[s].EndSector < (trk.Sectors + trk.StartSector - 1))
_sessions[s].EndSector = trk.Sectors + trk.StartSector - 1;
}
}
}
}
discimage.Sessions.Add(_sessions[0]);
discimage.Sessions.Add(_sessions[1]);
discimage.Disktype = MediaType.GDROM;
// DEBUG information
DicConsole.DebugWriteLine("GDI plugin", "Disc image parsing results");
DicConsole.DebugWriteLine("GDI plugin", "Session information:");
DicConsole.DebugWriteLine("GDI plugin", "\tDisc contains {0} sessions", discimage.Sessions.Count);
for(int i = 0; i < discimage.Sessions.Count; i++)
{
DicConsole.DebugWriteLine("GDI plugin", "\tSession {0} information:", i + 1);
DicConsole.DebugWriteLine("GDI plugin", "\t\tStarting track: {0}",
discimage.Sessions[i].StartTrack);
DicConsole.DebugWriteLine("GDI plugin", "\t\tStarting sector: {0}",
discimage.Sessions[i].StartSector);
DicConsole.DebugWriteLine("GDI plugin", "\t\tEnding track: {0}", discimage.Sessions[i].EndTrack);
DicConsole.DebugWriteLine("GDI plugin", "\t\tEnding sector: {0}", discimage.Sessions[i].EndSector);
}
DicConsole.DebugWriteLine("GDI plugin", "Track information:");
DicConsole.DebugWriteLine("GDI plugin", "\tDisc contains {0} tracks", discimage.Tracks.Count);
for(int i = 0; i < discimage.Tracks.Count; i++)
{
DicConsole.DebugWriteLine("GDI plugin", "\tTrack {0} information:", discimage.Tracks[i].Sequence);
DicConsole.DebugWriteLine("GDI plugin", "\t\t{0} bytes per sector", discimage.Tracks[i].Bps);
DicConsole.DebugWriteLine("GDI plugin", "\t\tPregap: {0} sectors", discimage.Tracks[i].Pregap);
if((discimage.Tracks[i].Flags & 0x80) == 0x80)
DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is flagged as quadraphonic");
if((discimage.Tracks[i].Flags & 0x40) == 0x40)
DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack is data");
if((discimage.Tracks[i].Flags & 0x20) == 0x20)
DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack allows digital copy");
if((discimage.Tracks[i].Flags & 0x10) == 0x10)
DicConsole.DebugWriteLine("GDI plugin", "\t\tTrack has pre-emphasis applied");
DicConsole.DebugWriteLine("GDI plugin",
"\t\tTrack resides in file {0}, type defined as {1}, starting at byte {2}",
discimage.Tracks[i].Trackfilter, discimage.Tracks[i].Tracktype,
discimage.Tracks[i].Offset);
}
DicConsole.DebugWriteLine("GDI plugin", "Building offset map");
partitions = new List<Partition>();
ulong byteOffset = 0;
for(int i = 0; i < discimage.Tracks.Count; i++)
{
if(discimage.Tracks[i].Sequence == 1 && i != 0)
throw new ImageNotSupportedException("Unordered tracks");
Partition partition = new Partition();
// Index 01
partition.Description = string.Format("Track {0}.", discimage.Tracks[i].Sequence);
partition.Name = null;
partition.Start = discimage.Tracks[i].StartSector;
partition.Size = discimage.Tracks[i].Sectors * discimage.Tracks[i].Bps;
partition.Length = discimage.Tracks[i].Sectors;
partition.Sequence = discimage.Tracks[i].Sequence;
partition.Offset = byteOffset;
partition.Type = discimage.Tracks[i].Tracktype.ToString();
byteOffset += partition.Size;
offsetmap.Add(discimage.Tracks[i].Sequence, partition.Start);
partitions.Add(partition);
}
foreach(GdiTrack track in discimage.Tracks) ImageInfo.ImageSize += track.Bps * track.Sectors;
foreach(GdiTrack track in discimage.Tracks) ImageInfo.Sectors += track.Sectors;
ImageInfo.Sectors += densitySeparationSectors;
ImageInfo.SectorSize = 2352; // All others
foreach(GdiTrack track in discimage.Tracks)
{
if((track.Flags & 0x40) == 0x40 && track.Bps == 2352)
{
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEcc);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccP);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccQ);
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);
}
}
ImageInfo.ImageCreationTime = imageFilter.GetCreationTime();
ImageInfo.ImageLastModificationTime = imageFilter.GetLastWriteTime();
ImageInfo.MediaType = discimage.Disktype;
ImageInfo.ReadableSectorTags.Add(SectorTagType.CdTrackFlags);
ImageInfo.XmlMediaType = XmlMediaType.OpticalDisc;
DicConsole.VerboseWriteLine("GDI image describes a disc of type {0}", ImageInfo.MediaType);
return true;
}
catch(Exception ex)
{
DicConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter.GetBasePath());
DicConsole.ErrorWriteLine("Exception: {0}", ex.Message);
DicConsole.ErrorWriteLine("Stack trace: {0}", ex.StackTrace);
return false;
}
}
public override bool ImageHasPartitions()
{
return ImageInfo.ImageHasPartitions;
}
public override ulong GetImageSize()
{
return ImageInfo.ImageSize;
}
public override ulong GetSectors()
{
return ImageInfo.Sectors;
}
public override uint GetSectorSize()
{
return ImageInfo.SectorSize;
}
public override byte[] ReadDiskTag(MediaTagType tag)
{
throw new FeatureSupportedButNotImplementedImageException("Feature not supported by image format");
}
public override byte[] ReadSector(ulong sectorAddress)
{
return ReadSectors(sectorAddress, 1);
}
public override byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
{
return ReadSectorsTag(sectorAddress, 1, tag);
}
public override byte[] ReadSector(ulong sectorAddress, uint track)
{
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
}
}