/// <summary>
/// Reads a primary volume descriptor from a stream.
/// </summary>
/// <param name="stream">Stream to read the primary volume descriptor from.</param>
/// <returns>Primary volume descriptor read from the stream.</returns>
public static PrimaryVolumeDescriptor Read(Stream stream)
{
var reader = new BinaryReader(stream);
if (reader.ReadByte() != 0x01)
{
return(null);
}
if (ReadAsciiString(reader, 5) != "CD001")
{
throw new InvalidDataException("Not a primary volume descriptor.");
}
reader.ReadByte(); // Version: 0x01
reader.ReadByte(); // Unused
var pvd = new PrimaryVolumeDescriptor();
pvd.SystemIdentifier = ReadAsciiString(reader, 32);
pvd.VolumeIdentifier = ReadAsciiString(reader, 32);
stream.Seek(8, SeekOrigin.Current);
pvd.VolumeSpaceSize = reader.ReadUInt32();
stream.Seek(36, SeekOrigin.Current);
pvd.VolumeSetSize = reader.ReadUInt16();
stream.Seek(2, SeekOrigin.Current);
pvd.VolumeSequenceNumber = reader.ReadUInt16();
stream.Seek(2, SeekOrigin.Current);
pvd.LogicalBlockSize = reader.ReadUInt16();
stream.Seek(2, SeekOrigin.Current);
pvd.PathTableSize = reader.ReadUInt32();
stream.Seek(4, SeekOrigin.Current);
pvd.PathTableLocation = reader.ReadUInt32();
pvd.OptionalPathTableLocation = reader.ReadUInt32();
stream.Seek(8, SeekOrigin.Current);
pvd.RootDirectoryEntry = DirectoryEntry.Read(reader);
pvd.VolumeSetIdentifier = ReadAsciiString(reader, 128);
pvd.PublisherIdentifier = ReadAsciiString(reader, 128);
pvd.DataPreparerIdentifier = ReadAsciiString(reader, 128);
pvd.ApplicationIdentifier = ReadAsciiString(reader, 128);
pvd.CopyrightFileIdentifier = ReadAsciiString(reader, 38);
pvd.AbstractFileIdentifier = ReadAsciiString(reader, 36);
pvd.BibliographicFileIdentifier = ReadAsciiString(reader, 37);
pvd.VolumeCreationDate = ReadDate(reader);
pvd.VolumeModificationDate = ReadDate(reader);
pvd.VolumeExpirationDate = ReadDate(reader);
pvd.VolumeEffectiveDate = ReadDate(reader);
return(pvd);
}
/// <summary>
/// Initializes a new instance of the <see cref="Iso9660Disc"/> class.
/// </summary>
/// <param name="rawDisc">A stream backed by the raw disc.</param>
/// <param name="sectorSize">The size of a sector on the disc.</param>
public Iso9660Disc(Stream rawDisc, int sectorSize)
{
if (rawDisc == null)
{
throw new ArgumentNullException("rawDisc");
}
this.rawDisc = rawDisc;
rawDisc.Position = 16 * sectorSize;
this.pvd = PrimaryVolumeDescriptor.Read(rawDisc);
this.initializeTask = Task.Factory.StartNew(Initialize);
}