/// <summary>
/// Read a directory entry
/// </summary>
/// <param name="stream">The stream to read</param>
private DirectoryEntry ReadDirectoryEntry(CBinaryReader stream)
{
DirectoryEntry entry = null;
try
{
long position = stream.Position;
entry = new DirectoryEntry();
entry.Length = stream.ReadByte();
entry.ExtendedAttributeRecordlength = stream.ReadByte();
entry.ExtentLba = stream.ReadUInt32();
if (entry.ExtentLba != stream.ReadUInt32BE())
{
throw new FrameworkException("Error while reading DirectoryEntry : ExtentLBA is not valid");
}
entry.ExtentSize = stream.ReadUInt32();
if (entry.ExtentSize != stream.ReadUInt32BE())
{
throw new FrameworkException("Error while reading DirectoryEntry : ExtentSize is not valid");
}
byte[] buffer = stream.ReadBytes(7);
entry.Date = new DateTime(buffer[0] + 1900, buffer[1], buffer[2], buffer[3], buffer[4], buffer[5], DateTimeKind.Utc);
entry.Flags = stream.ReadByte();
entry.FileUnitSize = stream.ReadByte();
entry.Interleave = stream.ReadByte();
entry.VolumeSequenceNumber = stream.ReadUInt16();
if (entry.VolumeSequenceNumber != stream.ReadUInt16BE())
{
throw new FrameworkException("Error while reading DirectoryEntry : VolumeSequenceNumber is not valid");
}
byte nameLength = stream.ReadByte();
entry.Name = _regFileName.Match(stream.ReadAsciiString(nameLength, false)).Groups[1].Value;
if (nameLength % 2 == 0)
{
stream.Position += 1;
}
if (_isXa && (stream.Position != position + entry.Length))
{
entry.XaEntry = new XaEntry();
entry.XaEntry.GroupId = stream.ReadUInt16BE();
entry.XaEntry.UserId = stream.ReadUInt16BE();
entry.XaEntry.Attributes = stream.ReadUInt16BE();
entry.XaEntry.Signature = stream.ReadAsciiString(2);
if (entry.XaEntry.Signature != XaEntry.XA_SIGNATURE)
{
throw new FrameworkException("Error while reading DirectoryEntry : XaEntry is not valid");
}
entry.XaEntry.FileNumber = stream.ReadByte();
entry.XaEntry.Unused = stream.ReadBytes(5);
}
}
catch (FrameworkException ex)
{
throw ex;
}
catch (Exception)
{
throw new FrameworkException("Error while reading DirectoryEntry : DirectoryEntry is not valid");
}
return(entry);
}
/// <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);
}
