/// <summary>
/// Finds <see cref="ArchiveDataBlockPointer"/> that match the search criteria that is determined by member variables.
/// </summary>
private bool FindDataBlockPointer(ArchiveDataBlockPointer dataBlockPointer)
{
if (dataBlockPointer != null)
// Note: The StartTime value of the pointer is ignored if m_searchStartTime = TimeTag.MinValue and
// m_searchEndTime = TimeTag.MaxValue. In this case only the PointID value is compared. This
// comes in handy when the first or last pointer is to be found from the list of pointers for
// a point ID in addition to all the pointer for a point ID.
return ((dataBlockPointer.HistorianID == m_searchHistorianID) &&
(m_searchStartTime == TimeTag.MinValue || dataBlockPointer.StartTime >= m_searchStartTime) &&
(m_searchEndTime == TimeTag.MaxValue || dataBlockPointer.StartTime <= m_searchEndTime));
else
return false;
}
/// <summary>
/// Initializes <see cref="VariableTableRegion"/> by parsing the specified <paramref name="buffer"/> containing a binary image.
/// </summary>
/// <param name="buffer">Buffer containing binary image to parse.</param>
/// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start parsing.</param>
/// <param name="length">Valid number of bytes within <paramref name="buffer"/> from <paramref name="startIndex"/>.</param>
/// <returns>The number of bytes used for initialization in the <paramref name="buffer"/> (i.e., the number of bytes parsed).</returns>
/// <exception cref="ArgumentNullException"><paramref name="buffer"/> is null.</exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="startIndex"/> or <paramref name="length"/> is less than 0 -or-
/// <paramref name="startIndex"/> and <paramref name="length"/> will exceed <paramref name="buffer"/> length.
/// </exception>
public int ParseBinaryImage(byte[] buffer, int startIndex, int length)
{
buffer.ValidateParameters(startIndex, length);
ArchiveDataBlockPointer blockPointer;
// Set parsing cursor beyond old-style visual basic array descriptor
int index = startIndex + ArrayDescriptorLength;
for (int i = 0; i < m_parent.m_dataBlockCount; i++)
{
blockPointer = new ArchiveDataBlockPointer(m_parent.m_parent, i);
index += blockPointer.ParseBinaryImage(buffer, index, length - (index - startIndex));
m_parent.m_dataBlockPointers.Add(blockPointer);
}
return (index - startIndex);
}
