public Record CloneViaReserialise()
{
// Do it via a re-serialization
// It's a cheat, but it works...
byte[] b = Serialize();
using (MemoryStream ms = new MemoryStream(b))
{
RecordInputStream rinp = new RecordInputStream(ms);
rinp.NextRecord();
Record[] r = RecordFactory.CreateRecord(rinp);
if (r.Length != 1)
{
throw new InvalidOperationException("Re-serialised a record to clone it, but got " + r.Length + " records back!");
}
return(r[0]);
}
}
public StreamEncryptionInfo(RecordInputStream rs, List <Record> outputRecs)
{
Record rec;
rs.NextRecord();
int recSize = 4 + rs.Remaining;
rec = RecordFactory.CreateSingleRecord(rs);
outputRecs.Add(rec);
FilePassRecord fpr = null;
if (rec is BOFRecord)
{
_hasBOFRecord = true;
// Fetch the next record, and see if it indicates whether
// the document is encrypted or not
if (rs.HasNextRecord)
{
rs.NextRecord();
rec = RecordFactory.CreateSingleRecord(rs);
recSize += rec.RecordSize;
outputRecs.Add(rec);
// Encrypted is normally BOF then FILEPASS
// May sometimes be BOF, WRITEPROTECT, FILEPASS
if (rec is WriteProtectRecord && rs.HasNextRecord)
{
rs.NextRecord();
rec = RecordFactory.CreateSingleRecord(rs);
recSize += rec.RecordSize;
outputRecs.Add(rec);
}
// If it's a FILEPASS, track it specifically but
// don't include it in the main stream
if (rec is FilePassRecord)
{
fpr = (FilePassRecord)rec;
outputRecs.RemoveAt(outputRecs.Count - 1);
// TODO - add fpr not Added to outPutRecs
rec = outputRecs[0];
}
else
{
// workbook not encrypted (typical case)
if (rec is EOFRecord)
{
// A workbook stream is never empty, so crash instead
// of trying to keep track of nesting level
throw new InvalidOperationException("Nothing between BOF and EOF");
}
}
}
}
else
{
// Invalid in a normal workbook stream.
// However, some test cases work on sub-sections of
// the workbook stream that do not begin with BOF
_hasBOFRecord = false;
}
_InitialRecordsSize = recSize;
_filePassRec = fpr;
_lastRecord = rec;
}
/**
* @return the next available record, or <code>null</code> if
* this pass didn't return a record that's
* suitable for returning (eg was a continue record).
*/
private Record ReadNextRecord()
{
Record record = RecordFactory.CreateSingleRecord(_recStream);
_lastRecordWasEOFLevelZero = false;
if (record is BOFRecord)
{
_bofDepth++;
return(record);
}
if (record is EOFRecord)
{
_bofDepth--;
if (_bofDepth < 1)
{
_lastRecordWasEOFLevelZero = true;
}
return(record);
}
if (record is DBCellRecord)
{
// Not needed by POI. Regenerated from scratch by POI when spreadsheet is written
return(null);
}
if (record is RKRecord)
{
return(RecordFactory.ConvertToNumberRecord((RKRecord)record));
}
if (record is MulRKRecord)
{
Record[] records = RecordFactory.ConvertRKRecords((MulRKRecord)record);
_unreadRecordBuffer = records;
_unreadRecordIndex = 1;
return(records[0]);
}
if (record.Sid == DrawingGroupRecord.sid &&
_lastRecord is DrawingGroupRecord)
{
DrawingGroupRecord lastDGRecord = (DrawingGroupRecord)_lastRecord;
lastDGRecord.Join((AbstractEscherHolderRecord)record);
return(null);
}
if (record.Sid == ContinueRecord.sid)
{
ContinueRecord contRec = (ContinueRecord)record;
if (_lastRecord is ObjRecord || _lastRecord is TextObjectRecord)
{
// Drawing records have a very strange continue behaviour.
//There can actually be OBJ records mixed between the continues.
_lastDrawingRecord.ProcessContinueRecord(contRec.Data);
//we must remember the position of the continue record.
//in the serialization procedure the original structure of records must be preserved
if (_shouldIncludeContinueRecords)
{
return(record);
}
return(null);
}
if (_lastRecord is DrawingGroupRecord)
{
((DrawingGroupRecord)_lastRecord).ProcessContinueRecord(contRec.Data);
return(null);
}
if (_lastRecord is DrawingRecord)
{
//((DrawingRecord)_lastRecord).ProcessContinueRecord(contRec.Data);
return(contRec);
}
if (_lastRecord is CrtMlFrtRecord)
{
return(record);
}
if (_lastRecord is UnknownRecord)
{
//Gracefully handle records that we don't know about,
//that happen to be continued
return(record);
}
if (_lastRecord is EOFRecord)
{
// This is really odd, but excel still sometimes
// outPuts a file like this all the same
return(record);
}
//if (_lastRecord is StringRecord)
//{
// ((StringRecord)_lastRecord).ProcessContinueRecord(contRec.Data);
// return null;
//}
throw new RecordFormatException("Unhandled Continue Record");
}
_lastRecord = record;
if (record is DrawingRecord)
{
_lastDrawingRecord = (DrawingRecord)record;
}
return(record);
}
