/// <summary>
/// Reads record under cursor and advances cursor position to next record
/// </summary>
/// <returns></returns>
public XlsBiffRecord Read()
{
//add lock(this) as this is equivalent to [MethodImpl(MethodImplOptions.Synchronized)] on the method
lock (this)
{
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);
}
}
/// <summary>
/// Reads record at specified offset, does not change cursor position
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
public XlsBiffRecord ReadAt(int offset)
{
if ((uint)offset >= bytes.Length)
{
return(null);
}
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);
}
/// <summary>
/// Reads record under cursor and advances cursor position to next record
/// </summary>
/// <returns>The record -or- null.</returns>
public XlsBiffRecord Read()
{
// Minimum record size is 4
if ((uint)Position + 4 >= _bytes.Length)
{
return(null);
}
var record = XlsBiffRecord.GetRecord(_bytes, (uint)Position, BiffVersion);
if (record != null)
{
Position += record.Size;
}
if (Position > Size)
{
record = null;
}
return(record);
}