private static RecordInputStream ConvertToInputStream(DrawingRecord r)
{
byte[] data = r.Serialize();
using (MemoryStream ms = new MemoryStream(data))
{
RecordInputStream rinp = new RecordInputStream(ms);
rinp.NextRecord();
return rinp;
}
}
/// <summary>
/// Returns the next available record, or null if
/// this pass didn't return a record that's
/// suitable for returning (eg was a continue record).
/// </summary>
/// <returns></returns>
private Record GetNextRecord()
{
Record toReturn = null;
if (in1.HasNextRecord)
{
// Grab our next record
in1.NextRecord();
short sid = in1.Sid;
//
// for some reasons we have to make the workbook to be at least 4096 bytes
// but if we have such workbook we Fill the end of it with zeros (many zeros)
//
// it Is not good:
// if the Length( all zero records ) % 4 = 1
// e.g.: any zero record would be Readed as 4 bytes at once ( 2 - id and 2 - size ).
// And the last 1 byte will be Readed WRONG ( the id must be 2 bytes )
//
// So we should better to Check if the sid Is zero and not to Read more data
// The zero sid shows us that rest of the stream data Is a fake to make workbook
// certain size
//
if (sid == 0)
return null;
// If we had a last record, and this one
// Isn't a continue record, then pass
// it on to the listener
if ((rec != null) && (sid != ContinueRecord.sid))
{
// This last record ought to be returned
toReturn = rec;
}
// If this record Isn't a continue record,
// then build it up
if (sid != ContinueRecord.sid)
{
//Console.WriteLine("creating "+sid);
Record[] recs = RecordFactory.CreateRecord(in1);
// We know that the multiple record situations
// don't contain continue records, so just
// pass those on to the listener now
if (recs.Length > 1)
{
bonusRecords = new ArrayList(recs.Length - 1);
for (int k = 0; k < (recs.Length - 1); k++)
{
bonusRecords.Add(recs[k]);
}
}
// Regardless of the number we Created, always hold
// onto the last record to be Processed on the next
// loop, in case it has any continue records
rec = recs[recs.Length - 1];
// Don't return it just yet though, as we probably have
// a record from the last round to return
}
else
{
// Normally, ContinueRecords are handled internally
// However, in a few cases, there Is a gap between a record at
// its Continue, so we have to handle them specially
// This logic Is much like in RecordFactory.CreateRecords()
Record[] recs = RecordFactory.CreateRecord(in1);
ContinueRecord crec = (ContinueRecord)recs[0];
if ((lastRec is ObjRecord) || (lastRec is TextObjectRecord))
{
// You can have Obj records between a DrawingRecord
// and its continue!
lastDrawingRecord.ProcessContinueRecord(crec.Data);
// Trigger them on the drawing record, now it's complete
rec = lastDrawingRecord;
}
else if ((lastRec is DrawingGroupRecord))
{
((DrawingGroupRecord)lastRec).ProcessContinueRecord(crec.Data);
// Trigger them on the drawing record, now it's complete
rec = lastRec;
}
else
{
if (rec is UnknownRecord)
{
;//silently skip records we don't know about
}
else
{
throw new RecordFormatException("Records should handle ContinueRecord internally. Should not see this exception");
}
}
}
// Update our tracking of the last record
lastRec = rec;
if (rec is DrawingRecord)
{
lastDrawingRecord = (DrawingRecord)rec;
}
}
else
{
// No more records
hitEOS = true;
}
// If we've hit the end-of-stream, then
// finish off the last record and be done
if (hitEOS)
{
complete = true;
// Return the last record if there was
// one, otherwise null
if (rec != null)
{
toReturn = rec;
rec = null;
}
}
return toReturn;
}
/**
* Serializes this aggregate to a byte array. Since this Is an aggregate
* record it will effectively Serialize the aggregated records.
*
* @param offset The offset into the start of the array.
* @param data The byte array to Serialize to.
* @return The number of bytes Serialized.
*/
public override int Serialize(int offset, byte [] data)
{
ConvertUserModelToRecords();
// Determine buffer size
IList records = EscherRecords;
int size = GetEscherRecordSize(records);
byte[] buffer = new byte[size];
// Serialize escher records into one big data structure and keep note of ending offsets.
spEndingOffsets = new ArrayList();
shapes = new ArrayList();
int pos = 0;
for (IEnumerator iterator = records.GetEnumerator(); iterator.MoveNext(); )
{
EscherRecord e = (EscherRecord)iterator.Current;
pos += e.Serialize(pos, buffer, new SerializationListener(ref spEndingOffsets,ref shapes));
}
// todo: fix this
shapes.Insert(0, null);
spEndingOffsets.Insert(0, null);
// Split escher records into Separate MSODRAWING and OBJ, TXO records. (We don't break on
// the first one because it's the patriach).
pos = offset;
for (int i = 1; i < shapes.Count; i++)
{
int endOffset = (int)spEndingOffsets[i] - 1;
int startOffset;
if (i == 1)
startOffset = 0;
else
startOffset = (int)spEndingOffsets[i - 1];
// Create and Write a new MSODRAWING record
DrawingRecord drawing = new DrawingRecord();
byte[] drawingData = new byte[endOffset - startOffset + 1];
Array.Copy(buffer, startOffset, drawingData, 0, drawingData.Length);
drawing.Data=drawingData;
int temp = drawing.Serialize(pos, data);
pos += temp;
// Write the matching OBJ record
Record obj = (Record)shapeToObj[shapes[i]];
temp = obj.Serialize(pos, data);
pos += temp;
}
// Write records that need to be Serialized after all drawing Group records
for (int i = 0; i < tailRec.Count; i++)
{
Record rec = (Record)tailRec[i];
pos += rec.Serialize(pos, data);
}
int bytesWritten = pos - offset;
if (bytesWritten != RecordSize)
throw new RecordFormatException(bytesWritten + " bytes written but RecordSize reports " + RecordSize);
return bytesWritten;
}
public override Object Clone()
{
DrawingRecord rec = new DrawingRecord();
rec.recordData = (byte[])recordData.Clone();// new byte[recordData.Length];
if (contd != null)
{
rec.contd = (byte[])contd.Clone();
}
return rec;
}
public DrawingRecordForBiffViewer(DrawingRecord r)
: base(ConvertToInputStream(r))
{
ConvertRawBytesToEscherRecords();
}