/// <summary>
/// Returns an index into Workbook.ExtendedFormats for the given cell and preceding ixfe record.
/// </summary>
private int GetXfIndexForCell(XlsBiffBlankCell cell, XlsBiffRecord ixfe)
{
if (Workbook.BiffVersion == 2)
{
if (cell.XFormat == 63 && ixfe != null)
{
var xFormat = ixfe.ReadUInt16(0);
return(xFormat);
}
else if (cell.XFormat > 63)
{
// Invalid XF ref on cell in BIFF2 stream
return(-1);
}
else if (cell.XFormat < Workbook.ExtendedFormats.Count)
{
return(cell.XFormat);
}
else
{
// Either the file has no XFs, or XF was out of range
return(-1);
}
}
return(cell.XFormat);
}
/// <summary>
/// Reads record at specified offset, does not change cursor position
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
public XlsBiffRecord ReadAt(int offset)
{
XlsBiffRecord rec = XlsBiffRecord.GetRecord(bytes, (uint)offset);
if (m_offset + rec.Size > m_size)
{
return(null);
}
return(rec);
}
public XlsBiffRecord ReadAt(int offset)
{
XlsBiffRecord record = XlsBiffRecord.GetRecord(this.bytes, (uint)offset);
if ((this.m_offset + record.Size) > this.m_size)
{
return(null);
}
return(record);
}
private XlsRowBlock ReadNextBlock(XlsBiffStream biffStream, int startRow, int rows, int minOffset, int maxOffset)
{
var result = new XlsRowBlock {
Rows = new Dictionary <int, Row>()
};
// Ensure rows with physical records are initialized with height
for (var i = 0; i < rows; i++)
{
if (RowOffsetMap.TryGetValue(startRow + i, out _))
{
EnsureRow(result, startRow + i);
}
}
if (minOffset == int.MaxValue)
{
return(result);
}
biffStream.Position = minOffset;
XlsBiffRecord rec;
XlsBiffRecord ixfe = null;
while (biffStream.Position <= maxOffset && (rec = biffStream.Read()) != null)
{
if (rec.Id == BIFFRECORDTYPE.IXFE)
{
// BIFF2: If cell.xformat == 63, this contains the actual XF index >= 63
ixfe = rec;
}
if (rec is XlsBiffBlankCell cell)
{
var currentRow = EnsureRow(result, cell.RowIndex);
if (cell.Id == BIFFRECORDTYPE.MULRK)
{
var cellValues = ReadMultiCell(cell);
currentRow.Cells.AddRange(cellValues);
}
else
{
var xfIndex = GetXfIndexForCell(cell, ixfe);
var cellValue = ReadSingleCell(biffStream, cell, xfIndex);
currentRow.Cells.Add(cellValue);
}
ixfe = null;
}
}
return(result);
}
public XlsBiffRecord Read()
{
XlsBiffRecord rec = XlsBiffRecord.GetRecord(bytes, (uint)m_offset);
m_offset += rec.Size;
if (m_offset > m_size)
{
return(null);
}
return(rec);
}
public XlsBiffRecord Read()
{
XlsBiffRecord record = XlsBiffRecord.GetRecord(this.bytes, (uint)this.m_offset);
this.m_offset += record.Size;
if (this.m_offset > this.m_size)
{
return(null);
}
return(record);
}
/// <summary>
/// Reads record at specified offset, does not change cursor position
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
public XlsBiffRecord ReadAt(int offset)
{
XlsBiffRecord rec = XlsBiffRecord.GetRecord(bytes, (uint)offset, reader);
//choose ReadOption.Loose to skip this check (e.g. sql reporting services)
if (reader.ReadOption == ReadOption.Strict)
{
if (m_offset + rec.Size > m_size)
{
return(null);
}
}
return(rec);
}
public XlsBiffRecord Read()
{
if ((uint)m_offset >= bytes.Length)
{
return(null);
}
XlsBiffRecord rec = XlsBiffRecord.GetRecord(bytes, (uint)m_offset, reader);
m_offset += rec.Size;
if (m_offset > m_size)
{
return(null);
}
return(rec);
}
