/// <summary>
/// Fetch all directory entries to build the internal index
/// </summary>
public void BuildIndex()
{
if (_indexBuilt)
{
return;
}
if (!_descriptorsRead)
{
throw new FrameworkException("Error : You must read the descriptors first");
}
try
{
long rootLba = _primaryVolumeDescriptor.RootDirectoryEntry.ExtentLba;
var stream = new CBinaryReader(ReadSector(rootLba, _defaultSectorMode));
var rootEntry = ReadDirectoryEntry(stream);
_index = new DataTrackIndex(rootEntry);
AddDirectoryToIndex(_index.Root);
_indexBuilt = true;
}
catch (FrameworkException ex)
{
throw ex;
}
catch (Exception)
{
throw new FrameworkException("Error while building the index : unable to read data to build the internal index cache");
}
}
// 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");
}
}