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);
}
private void StoreEntry(SuspExtension extension, SystemUseEntry entry)
{
string extensionId = extension == null ? string.Empty : extension.Identifier;
Dictionary <string, List <SystemUseEntry> > extensionEntries;
if (!_records.TryGetValue(extensionId, out extensionEntries))
{
extensionEntries = new Dictionary <string, List <SystemUseEntry> >();
_records.Add(extensionId, extensionEntries);
}
List <SystemUseEntry> entries;
if (!extensionEntries.TryGetValue(entry.Name, out entries))
{
entries = new List <SystemUseEntry>();
extensionEntries.Add(entry.Name, entries);
}
entries.Add(entry);
}