/// <summary>
/// Parse the given stream to populate the iso information
/// </summary>
/// <param name="s">The stream which we are using to parse the image.
/// Should already be located at the start of the image.</param>
public bool Parse(Stream s, int startSector = 16)
{
this.VolumeDescriptors = new List <ISOVolumeDescriptor>();
Root = null;
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Seek through the first volume descriptor
s.Seek(startPosition + (SECTOR_SIZE * startSector), SeekOrigin.Begin);
// Read one of more volume descriptors
do
{
//zero 24-jun-2013 - improved validity checks
ISOVolumeDescriptor desc = new ISOVolumeDescriptor();
bool isValid = desc.Parse(s);
if (!isValid)
{
return(false);
}
if (desc.IsTerminator())
{
break;
}
else if (desc.Type < 4)
{
this.VolumeDescriptors.Add(desc);
}
else
{
//found a volume descriptor of incorrect type.. maybe this isnt a cdfs
//supposedly these exist.. wait for one to show up
return(false);
}
} while (true);
//zero 24-jun-2013 - well, my very first test iso had 2 volume descriptors.
// Check to make sure we only read one volume descriptor
// Finding more could be an error with the disk.
//if (this.VolumeDescriptors.Count != 1) {
// Console.WriteLine("Strange ISO format...");
// return;
//}
//zero 24-jun-2013 - if theres no volume descriptors, we're gonna call this not a cdfs
if (VolumeDescriptors.Count == 0)
{
return(false);
}
// Visit all the directories and get the offset of each directory/file
// We need to keep track of the directories and files we have visited in case there are loops.
Dictionary <long, ISONode> visitedNodes = new Dictionary <long, ISONode>();
// Create (and visit) the root node
this.Root = new ISODirectoryNode(this.VolumeDescriptors[0].RootDirectoryRecord);
visitedNodes.Add(this.Root.Offset, this.Root);
this.Root.Parse(s, visitedNodes);
return(true);
}
/// <summary>
/// Parse the children based on the data in this directory.
/// </summary>
/// <param name="s">The stream to parse from.</param>
/// <param name="visited">The set of already handled
/// files/directories.</param>
public void Parse(Stream s, Dictionary <long, ISONode> visited)
{
// Go to the beginning of the set of directories
s.Seek(this.Offset * ISOFile.SECTOR_SIZE, SeekOrigin.Begin);
List <ISONodeRecord> records = new List <ISONodeRecord>();
// Read the directory entries
while (s.Position < ((this.Offset * ISOFile.SECTOR_SIZE) + this.Length))
{
ISONode node;
ISONodeRecord record;
// Read the record
record = new ISONodeRecord();
record.Parse(s);
//zero 24-jun-2013 - improved validity checks
//theres nothing here!
if (record.Length == 0)
{
break;
}
else
{
// Check if we already have this node
if (visited.ContainsKey(record.OffsetOfData))
{
// Get the node
node = visited[record.OffsetOfData];
}
else
{
// Create the node from the record
if (record.IsFile())
{
node = new ISOFileNode(record);
}
else if (record.IsDirectory())
{
node = new ISODirectoryNode(record);
}
else
{
node = new ISONode(record);
}
// Keep track that we've now seen the node and are parsing it
visited.Add(node.Offset, node);
}
// Add the node as a child
this.Children.Add(record.Name, node);
}
}
long currentPosition = s.Position;
// Iterate over directories...
foreach (KeyValuePair <string, ISONode> child in this.Children)
{
// Parse this node
if (child.Key != ISONodeRecord.CURRENT_DIRECTORY &&
child.Key != ISONodeRecord.PARENT_DIRECTORY &&
child.Value is ISODirectoryNode)
{
((ISODirectoryNode)child.Value).Parse(s, visited);
}
}
s.Seek(currentPosition, SeekOrigin.Begin);
}