// Methods
/// <summary>
/// Init the pvd and allocate some space for the path table and the root directory
/// </summary>
/// <param name="volumeId">The volume identifier</param>
/// <param name="pathTableSize">Size of the path table in sector (default 1)</param>
/// <param name="rootDirectorySize">Size of the root directory in sector (default 1)</param>
public void Prepare(string volumeId, int pathTableSize = 1, int rootDirectorySize = 1)
{
try
{
if (_prepared)
{
return;
}
SeekSector(16);
WriteEmptySectors(2 + pathTableSize * 4);
var root = new DirectoryEntry(_isXa);
root.IsDirectory = true;
root.ExtentSize = (uint)(rootDirectorySize * GetSectorDataSize(_defaultSectorMode));
root.ExtentLba = (uint)SectorCount;
_index = new DataTrackIndex(root);
_primaryVolumeDescriptor = new PrimaryVolumeDescriptor(1);
_primaryVolumeDescriptor.VolumeId = volumeId;
_primaryVolumeDescriptor.PathTableSize = (uint)(pathTableSize * GetSectorDataSize(_defaultSectorMode));
// The root directory included in the volume descriptor doesn't allow XA, so let's create a separated one
_primaryVolumeDescriptor.RootDirectoryEntry = new DirectoryEntry(false);
_primaryVolumeDescriptor.RootDirectoryEntry.IsDirectory = true;
_primaryVolumeDescriptor.RootDirectoryEntry.ExtentSize = root.ExtentSize;
_primaryVolumeDescriptor.RootDirectoryEntry.ExtentLba = root.ExtentLba;
WriteEmptySectors(rootDirectorySize);
_prepared = true;
}
catch (FrameworkException ex)
{
throw ex;
}
catch (Exception)
{
throw new FrameworkException("Errow while preparing track : unable to prepare data track");
}
}
/// <summary>
/// Read a primary volume descriptor
/// </summary>
/// <param name="stream">The stream to read</param>
private PrimaryVolumeDescriptor ReadPrimaryVolumeDescriptor(CBinaryReader stream)
{
PrimaryVolumeDescriptor descriptor;
try
{
byte version = stream.ReadByte();
descriptor = new PrimaryVolumeDescriptor(version);
descriptor.Unused1 = stream.ReadByte();
descriptor.SystemId = stream.ReadAsciiString(32);
descriptor.VolumeId = stream.ReadAsciiString(32);
descriptor.Unused2 = stream.ReadBytes(8);
descriptor.VolumeSpaceSize = stream.ReadUInt32();
if (descriptor.VolumeSpaceSize != stream.ReadUInt32BE())
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : VolumeSpaceSize is not valid");
}
descriptor.Unused3 = stream.ReadBytes(32);
descriptor.VolumeSetSize = stream.ReadUInt16();
if (descriptor.VolumeSetSize != stream.ReadUInt16BE())
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : VolumeSetSize is not valid");
}
descriptor.VolumeSequenceNumber = stream.ReadUInt16();
if (descriptor.VolumeSequenceNumber != stream.ReadUInt16BE())
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : VolumeSequenceNumber is not valid");
}
descriptor.LogicalBlockSize = stream.ReadUInt16();
if (descriptor.LogicalBlockSize != stream.ReadUInt16BE())
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : LogicalBlockSize is not valid");
}
descriptor.PathTableSize = stream.ReadUInt32();
if (descriptor.PathTableSize != stream.ReadUInt32BE())
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : PathTableSize is not valid");
}
descriptor.TypeLPathTableLBA = stream.ReadUInt32();
descriptor.OptTypeLPathTableLBA = stream.ReadUInt32();
descriptor.TypeMPathTableLBA = stream.ReadUInt32BE();
descriptor.OptTypeMPathTableLBA = stream.ReadUInt32BE();
if (descriptor.OptTypeLPathTableLBA != 0 || descriptor.OptTypeMPathTableLBA != 0)
{
_hasOptionalPathTable = true;
}
descriptor.RootDirectoryEntry = ReadDirectoryEntry(stream);
// TODO : cas des fichiers
descriptor.VolumeSetId = stream.ReadAsciiString(128);
descriptor.PublisherId = stream.ReadAsciiString(128);
descriptor.PreparerId = stream.ReadAsciiString(128);
descriptor.ApplicationId = stream.ReadAsciiString(128);
descriptor.CopyrightFileId = stream.ReadAsciiString(38);
descriptor.AbstractFileId = stream.ReadAsciiString(36);
descriptor.BibliographicFileId = stream.ReadAsciiString(37);
//
descriptor.CreationDate = VolumeDescriptor.ToDateTime(stream.ReadBytes(17));
descriptor.ModificationDate = VolumeDescriptor.ToDateTime(stream.ReadBytes(17));
descriptor.ExpirationDate = VolumeDescriptor.ToDateTime(stream.ReadBytes(17));
descriptor.EffectiveDate = VolumeDescriptor.ToDateTime(stream.ReadBytes(17));
descriptor.FileStructureVersion = stream.ReadByte();
descriptor.Unused4 = stream.ReadByte();
descriptor.ApplicationData = stream.ReadBytes(512);
descriptor.Reserved = stream.ReadBytes(653);
// if the disk is CDROM/XA (and then contains an XaEntry in his DirectoryEntries),
// "CD-XA001" can be read at offset 0x400 of the pvd (actually offset 0x8D of ApplicationData field)
if (CBuffer.ReadAsciiString(descriptor.ApplicationData, 0x8D, 8) == VolumeDescriptor.VOLUME_XA)
{
_isXa = true;
}
}
catch (FrameworkException ex)
{
throw ex;
}
catch (Exception)
{
throw new FrameworkException("Error while reading PrimaryVolumeDescriptor : PrimaryVolumeDescriptor is not valid");
}
return(descriptor);
}