/// <summary>
/// Initializes a new instance of the VfsCDReader class.
/// </summary>
/// <param name="data">The stream to read the ISO image from.</param>
/// <param name="variantPriorities">Which possible file system variants to use, and with which priority.</param>
/// <param name="hideVersions">Hides version numbers (e.g. ";1") from the end of files.</param>
/// <remarks>
/// <para>
/// The implementation considers each of the file system variants in <c>variantProperties</c> and selects
/// the first which is determined to be present. In this example Joliet, then Rock Ridge, then vanilla
/// Iso9660 will be considered:
/// </para>
/// <code lang="cs">
/// VfsCDReader(stream, new Iso9660Variant[] {Joliet, RockRidge, Iso9660}, true);
/// </code>
/// <para>The Iso9660 variant should normally be specified as the final entry in the list. Placing it earlier
/// in the list will effectively mask later items and not including it may prevent some ISOs from being read.</para>
/// </remarks>
public VfsCDReader(Stream data, Iso9660Variant[] variantPriorities, bool hideVersions, int sectorSize)
: base(new DiscFileSystemOptions())
{
_data = data;
_sectorSize = sectorSize;
_hideVersions = hideVersions;
long vdpos = _sectorSize * 16; // Skip lead-in
byte[] buffer = new byte[_sectorSize];
long pvdPos = 0;
long svdPos = 0;
BaseVolumeDescriptor bvd;
do
{
data.Position = vdpos;
int numRead = data.Read(buffer, 0, _sectorSize);
if (numRead != _sectorSize)
{
break;
}
var offset = 24;
bvd = new BaseVolumeDescriptor(buffer, offset);
if (bvd.StandardIdentifier != BaseVolumeDescriptor.Iso9660StandardIdentifier)
{
throw new InvalidFileSystemException("Volume is not ISO-9660");
}
switch (bvd.VolumeDescriptorType)
{
case VolumeDescriptorType.Boot:
_bootVolDesc = new BootVolumeDescriptor(buffer, offset);
if (_bootVolDesc.SystemId != BootVolumeDescriptor.ElToritoSystemIdentifier)
{
_bootVolDesc = null;
}
break;
case VolumeDescriptorType.Primary: // Primary Vol Descriptor
pvdPos = vdpos;
break;
case VolumeDescriptorType.Supplementary: // Supplementary Vol Descriptor
svdPos = vdpos;
break;
case VolumeDescriptorType.Partition: // Volume Partition Descriptor
break;
case VolumeDescriptorType.SetTerminator: // Volume Descriptor Set Terminator
break;
}
vdpos += _sectorSize;
} while (bvd.VolumeDescriptorType != VolumeDescriptorType.SetTerminator);
ActiveVariant = Iso9660Variant.None;
foreach (Iso9660Variant variant in variantPriorities)
{
switch (variant)
{
case Iso9660Variant.Joliet:
if (svdPos != 0)
{
data.Position = svdPos;
data.Read(buffer, 0, _sectorSize);
SupplementaryVolumeDescriptor volDesc = new SupplementaryVolumeDescriptor(buffer, 0);
Context = new IsoContext(_sectorSize)
{
VolumeDescriptor = volDesc, DataStream = _data
};
RootDirectory = new ReaderDirectory(Context,
new ReaderDirEntry(Context, volDesc.RootDirectory));
ActiveVariant = Iso9660Variant.Iso9660;
}
break;
case Iso9660Variant.RockRidge:
case Iso9660Variant.Iso9660:
if (pvdPos != 0)
{
data.Position = pvdPos + 24;
data.Read(buffer, 0, _sectorSize);
PrimaryVolumeDescriptor volDesc = new PrimaryVolumeDescriptor(buffer, 0);
volDesc.LogicalBlockSize = 2352;
IsoContext context = new IsoContext(_sectorSize)
{
VolumeDescriptor = volDesc, DataStream = _data
};
DirectoryRecord rootSelfRecord = ReadRootSelfRecord(context);
InitializeSusp(context, rootSelfRecord);
if (variant == Iso9660Variant.Iso9660
||
(variant == Iso9660Variant.RockRidge &&
!string.IsNullOrEmpty(context.RockRidgeIdentifier)))
{
Context = context;
RootDirectory = new ReaderDirectory(context, new ReaderDirEntry(context, rootSelfRecord));
ActiveVariant = variant;
}
}
break;
}
if (ActiveVariant != Iso9660Variant.None)
{
break;
}
}
if (ActiveVariant == Iso9660Variant.None)
{
throw new IOException("None of the permitted ISO9660 file system variants was detected");
}
}
protected override List <BuilderExtent> FixExtents(out long totalLength)
{
List <BuilderExtent> fixedRegions = new List <BuilderExtent>();
DateTime buildTime = DateTime.UtcNow;
Encoding suppEncoding = _buildParams.UseJoliet ? Encoding.BigEndianUnicode : Encoding.ASCII;
Dictionary <BuildDirectoryMember, uint> primaryLocationTable = new Dictionary <BuildDirectoryMember, uint>();
Dictionary <BuildDirectoryMember, uint> supplementaryLocationTable =
new Dictionary <BuildDirectoryMember, uint>();
long focus = DiskStart + 3 * _buildParams.SectorSize; // Primary, Supplementary, End (fixed at end...)
if (_bootEntry != null)
{
focus += _buildParams.SectorSize;
}
// ####################################################################
// # 0. Fix boot image location
// ####################################################################
long bootCatalogPos = 0;
if (_bootEntry != null)
{
long bootImagePos = focus;
Stream realBootImage = PatchBootImage(_bootImage, (uint)(DiskStart / _buildParams.SectorSize),
(uint)(bootImagePos / _buildParams.SectorSize));
BuilderStreamExtent bootImageExtent = new BuilderStreamExtent(focus, realBootImage);
fixedRegions.Add(bootImageExtent);
focus += MathUtilities.RoundUp(bootImageExtent.Length, _buildParams.SectorSize);
bootCatalogPos = focus;
byte[] bootCatalog = new byte[_buildParams.SectorSize];
BootValidationEntry bve = new BootValidationEntry();
bve.WriteTo(bootCatalog, 0x00);
_bootEntry.ImageStart = (uint)MathUtilities.Ceil(bootImagePos, _buildParams.SectorSize);
_bootEntry.SectorCount = (ushort)MathUtilities.Ceil(_bootImage.Length, Sizes.Sector);
_bootEntry.WriteTo(bootCatalog, 0x20);
fixedRegions.Add(new BuilderBufferExtent(bootCatalogPos, bootCatalog));
focus += _buildParams.SectorSize;
}
// ####################################################################
// # 1. Fix file locations
// ####################################################################
// Find end of the file data, fixing the files in place as we go
foreach (BuildFileInfo fi in _files)
{
primaryLocationTable.Add(fi, (uint)(focus / _buildParams.SectorSize));
supplementaryLocationTable.Add(fi, (uint)(focus / _buildParams.SectorSize));
FileExtent extent = new FileExtent(fi, focus);
// Only remember files of non-zero length (otherwise we'll stomp on a valid file)
if (extent.Length != 0)
{
fixedRegions.Add(extent);
}
focus += MathUtilities.RoundUp(extent.Length, _buildParams.SectorSize);
}
// ####################################################################
// # 2. Fix directory locations
// ####################################################################
// There are two directory tables
// 1. Primary (std ISO9660)
// 2. Supplementary (Joliet)
// Find start of the second set of directory data, fixing ASCII directories in place.
long startOfFirstDirData = focus;
foreach (BuildDirectoryInfo di in _dirs)
{
primaryLocationTable.Add(di, (uint)(focus / _buildParams.SectorSize));
DirectoryExtent extent = new DirectoryExtent(di, primaryLocationTable, Encoding.ASCII, focus);
fixedRegions.Add(extent);
focus += MathUtilities.RoundUp(extent.Length, _buildParams.SectorSize);
}
// Find end of the second directory table, fixing supplementary directories in place.
long startOfSecondDirData = focus;
foreach (BuildDirectoryInfo di in _dirs)
{
supplementaryLocationTable.Add(di, (uint)(focus / _buildParams.SectorSize));
DirectoryExtent extent = new DirectoryExtent(di, supplementaryLocationTable, suppEncoding, focus);
fixedRegions.Add(extent);
focus += MathUtilities.RoundUp(extent.Length, _buildParams.SectorSize);
}
// ####################################################################
// # 3. Fix path tables
// ####################################################################
// There are four path tables:
// 1. LE, ASCII
// 2. BE, ASCII
// 3. LE, Supp Encoding (Joliet)
// 4. BE, Supp Encoding (Joliet)
// Find end of the path table
long startOfFirstPathTable = focus;
PathTable pathTable = new PathTable(false, Encoding.ASCII, _dirs, primaryLocationTable, focus);
fixedRegions.Add(pathTable);
focus += MathUtilities.RoundUp(pathTable.Length, _buildParams.SectorSize);
long primaryPathTableLength = pathTable.Length;
long startOfSecondPathTable = focus;
pathTable = new PathTable(true, Encoding.ASCII, _dirs, primaryLocationTable, focus);
fixedRegions.Add(pathTable);
focus += MathUtilities.RoundUp(pathTable.Length, _buildParams.SectorSize);
long startOfThirdPathTable = focus;
pathTable = new PathTable(false, suppEncoding, _dirs, supplementaryLocationTable, focus);
fixedRegions.Add(pathTable);
focus += MathUtilities.RoundUp(pathTable.Length, _buildParams.SectorSize);
long supplementaryPathTableLength = pathTable.Length;
long startOfFourthPathTable = focus;
pathTable = new PathTable(true, suppEncoding, _dirs, supplementaryLocationTable, focus);
fixedRegions.Add(pathTable);
focus += MathUtilities.RoundUp(pathTable.Length, _buildParams.SectorSize);
// Find the end of the disk
totalLength = focus;
// ####################################################################
// # 4. Prepare volume descriptors now other structures are fixed
// ####################################################################
int regionIdx = 0;
focus = DiskStart;
PrimaryVolumeDescriptor pvDesc = new PrimaryVolumeDescriptor(
(uint)(totalLength / _buildParams.SectorSize), // VolumeSpaceSize
(uint)primaryPathTableLength, // PathTableSize
(uint)(startOfFirstPathTable / _buildParams.SectorSize), // TypeLPathTableLocation
(uint)(startOfSecondPathTable / _buildParams.SectorSize), // TypeMPathTableLocation
(uint)(startOfFirstDirData / _buildParams.SectorSize), // RootDirectory.LocationOfExtent
(uint)_rootDirectory.GetDataSize(Encoding.ASCII), // RootDirectory.DataLength
buildTime,
_sectorSize);
pvDesc.VolumeIdentifier = _buildParams.VolumeIdentifier;
PrimaryVolumeDescriptorRegion pvdr = new PrimaryVolumeDescriptorRegion(pvDesc, focus, _sectorSize);
fixedRegions.Insert(regionIdx++, pvdr);
focus += _buildParams.SectorSize;
if (_bootEntry != null)
{
BootVolumeDescriptor bvDesc = new BootVolumeDescriptor(
(uint)(bootCatalogPos / _buildParams.SectorSize), _buildParams.SectorSize);
BootVolumeDescriptorRegion bvdr = new BootVolumeDescriptorRegion(bvDesc, focus, _buildParams.SectorSize);
fixedRegions.Insert(regionIdx++, bvdr);
focus += _buildParams.SectorSize;
}
SupplementaryVolumeDescriptor svDesc = new SupplementaryVolumeDescriptor(
(uint)(totalLength / _buildParams.SectorSize), // VolumeSpaceSize
(uint)supplementaryPathTableLength, // PathTableSize
(uint)(startOfThirdPathTable / _buildParams.SectorSize), // TypeLPathTableLocation
(uint)(startOfFourthPathTable / _buildParams.SectorSize), // TypeMPathTableLocation
(uint)(startOfSecondDirData / _buildParams.SectorSize), // RootDirectory.LocationOfExtent
(uint)_rootDirectory.GetDataSize(suppEncoding), // RootDirectory.DataLength
buildTime,
suppEncoding,
_sectorSize);
svDesc.VolumeIdentifier = _buildParams.VolumeIdentifier;
SupplementaryVolumeDescriptorRegion svdr = new SupplementaryVolumeDescriptorRegion(svDesc, focus, _sectorSize);
fixedRegions.Insert(regionIdx++, svdr);
focus += _buildParams.SectorSize;
VolumeDescriptorSetTerminator evDesc = new VolumeDescriptorSetTerminator(_sectorSize);
VolumeDescriptorSetTerminatorRegion evdr = new VolumeDescriptorSetTerminatorRegion(evDesc, focus, _sectorSize);
fixedRegions.Insert(regionIdx++, evdr);
return(fixedRegions);
}