private int findFirstDataCellOffset(int startOffset)
{
//seek to the first dbcell record
var record = m_stream.ReadAt(startOffset);
while (!(record is XlsBiffDbCell))
{
if (m_stream.Position >= m_stream.Size)
{
return(-1);
}
if (record is XlsBiffEOF)
{
return(-1);
}
record = m_stream.Read();
}
XlsBiffDbCell startCell = (XlsBiffDbCell)record;
XlsBiffRow row = null;
int offs = startCell.RowAddress;
do
{
row = m_stream.ReadAt(offs) as XlsBiffRow;
if (row == null)
{
break;
}
offs += row.Size;
} while (null != row);
return(offs);
}
private bool moveToNextRecordNoIndex()
{
//seek from current row record to start of cell data where that cell relates to the next row record
XlsBiffRow rowRecord = m_currentRowRecord;
if (rowRecord == null)
{
return(false);
}
if (rowRecord.RowIndex < m_depth)
{
m_stream.Seek(rowRecord.Offset + rowRecord.Size, SeekOrigin.Begin);
do
{
if (m_stream.Position >= m_stream.Size)
{
return(false);
}
var record = m_stream.Read();
if (record is XlsBiffEOF)
{
return(false);
}
rowRecord = record as XlsBiffRow;
} while (rowRecord == null || rowRecord.RowIndex < m_depth);
}
m_currentRowRecord = rowRecord;
//m_depth = m_currentRowRecord.RowIndex;
//we have now found the row record for the new row, the we need to seek forward to the first cell record
XlsBiffBlankCell cell = null;
do
{
if (m_stream.Position >= m_stream.Size)
{
return(false);
}
var record = m_stream.Read();
if (record is XlsBiffEOF)
{
return(false);
}
if (record.IsCell)
{
var candidateCell = record as XlsBiffBlankCell;
if (candidateCell != null)
{
if (candidateCell.RowIndex == m_currentRowRecord.RowIndex)
{
cell = candidateCell;
}
}
}
} while (cell == null);
m_cellOffset = cell.Offset;
m_canRead = readWorkSheetRow();
//read last row
//if (!m_canRead && m_depth > 0) m_canRead = true;
//if (!m_canRead && m_dbCellAddrsIndex < (m_dbCellAddrs.Length - 1))
//{
// m_dbCellAddrsIndex++;
// m_cellOffset = findFirstDataCellOffset((int)m_dbCellAddrs[m_dbCellAddrsIndex]);
// m_canRead = readWorkSheetRow();
//}
return(m_canRead);
}
private bool readWorkSheetGlobals(XlsWorksheet sheet, out XlsBiffIndex idx, out XlsBiffRow row)
{
idx = null;
row = null;
m_stream.Seek((int)sheet.DataOffset, SeekOrigin.Begin);
XlsBiffBOF bof = m_stream.Read() as XlsBiffBOF;
if (bof == null || bof.Type != BIFFTYPE.Worksheet)
{
return(false);
}
//DumpBiffRecords();
XlsBiffRecord rec = m_stream.Read();
if (rec == null)
{
return(false);
}
if (rec is XlsBiffIndex)
{
idx = rec as XlsBiffIndex;
}
else if (rec is XlsBiffUncalced)
{
// Sometimes this come before the index...
idx = m_stream.Read() as XlsBiffIndex;
}
#region Если в текущем файле MS Biff нет индекса или он не находится в самом начале то основные данные в таблицах не находятся и выводится только минимум.
//if (null == idx)
//{
// // There is a record before the index! Chech his type and see the MS Biff Documentation
// return false;
//}
#endregion
if (idx != null)
{
idx.IsV8 = isV8();
}
XlsBiffRecord trec;
XlsBiffDimensions dims = null;
do
{
trec = m_stream.Read();
if (trec.ID == BIFFRECORDTYPE.DIMENSIONS)
{
dims = (XlsBiffDimensions)trec;
break;
}
} while (trec != null && trec.ID != BIFFRECORDTYPE.ROW);
//if we are already on row record then set that as the row, otherwise step forward till we get to a row record
if (trec.ID == BIFFRECORDTYPE.ROW)
{
row = (XlsBiffRow)trec;
}
XlsBiffRow rowRecord = null;
while (rowRecord == null)
{
if (m_stream.Position >= m_stream.Size)
{
break;
}
var thisRec = m_stream.Read();
if (thisRec is XlsBiffEOF)
{
break;
}
rowRecord = thisRec as XlsBiffRow;
}
row = rowRecord;
m_maxCol = 256;
if (dims != null)
{
dims.IsV8 = isV8();
m_maxCol = dims.LastColumn - 1;
sheet.Dimensions = dims;
}
m_maxRow = idx == null ? (int)dims.LastRow : (int)idx.LastExistingRow;
if (idx != null && idx.LastExistingRow <= idx.FirstExistingRow)
{
return(false);
}
else if (row == null)
{
return(false);
}
m_depth = 0;
return(true);
}
