private ContinuationSystemUseEntry Parse(IsoContext context, byte[] data, int offset)
{
ContinuationSystemUseEntry contEntry = null;
SuspExtension extension = null;
if (context.SuspExtensions != null && context.SuspExtensions.Count > 0)
{
extension = context.SuspExtensions[0];
}
int pos = offset;
while (data.Length - pos > 4)
{
int len;
SystemUseEntry entry = SystemUseEntry.Parse(data, pos, context.VolumeDescriptor.CharacterEncoding, extension, out len);
pos += len;
if (entry == null)
{
// Skip if unknown
continue;
}
switch (entry.Name)
{
case "ST":
// Abort
return(contEntry);
case "CE":
contEntry = (ContinuationSystemUseEntry)entry;
break;
case "ES":
ExtensionSelectSystemUseEntry esEntry = (ExtensionSelectSystemUseEntry)entry;
extension = context.SuspExtensions[esEntry.SelectedExtension];
break;
case "PD":
break;
case "SP":
case "ER":
StoreEntry(null, entry);
break;
default:
StoreEntry(extension, entry);
break;
}
}
return(contEntry);
}
private ContinuationSystemUseEntry Parse(IsoContext context, byte[] data, int offset)
{
ContinuationSystemUseEntry contEntry = null;
SuspExtension extension = null;
if (context.SuspExtensions != null && context.SuspExtensions.Count > 0)
{
extension = context.SuspExtensions[0];
}
int pos = offset;
while (data.Length - pos > 4)
{
byte len;
SystemUseEntry entry = SystemUseEntry.Parse(data, pos, context.VolumeDescriptor.CharacterEncoding,
extension, out len);
pos += len;
if (entry == null)
{
// A null entry indicates SUSP parsing must terminate.
// This will occur if a termination record is found,
// or if there is a problem with the SUSP data.
return(contEntry);
}
switch (entry.Name)
{
case "CE":
contEntry = (ContinuationSystemUseEntry)entry;
break;
case "ES":
ExtensionSelectSystemUseEntry esEntry = (ExtensionSelectSystemUseEntry)entry;
extension = context.SuspExtensions[esEntry.SelectedExtension];
break;
case "PD":
break;
case "SP":
case "ER":
StoreEntry(null, entry);
break;
default:
StoreEntry(extension, entry);
break;
}
}
return(contEntry);
}
public SuspRecords(IsoContext context, byte[] data, int offset)
{
_records = new Dictionary <string, Dictionary <string, List <SystemUseEntry> > >();
ContinuationSystemUseEntry contEntry = Parse(context, data, offset + context.SuspSkipBytes);
while (contEntry != null)
{
context.DataStream.Position = (contEntry.Block * (long)context.VolumeDescriptor.LogicalBlockSize) + contEntry.BlockOffset;
byte[] contData = Utilities.ReadFully(context.DataStream, (int)contEntry.Length);
contEntry = Parse(context, contData, 0);
}
}
