/// <summary> /// Returns the offset (in <see cref="fullStream"/>) of a row /// </summary> /// <param name="table">Table</param> /// <param name="rid">A valid row ID (i.e., >= <c>1</c> and <= number of rows)</param> /// <param name="offset">Updated with the offset</param> /// <returns><c>true</c> if the row exists, <c>false</c> if the row doesn't exist</returns> protected abstract bool GetRowOffset(MDTable table, uint rid, out long offset);
/// <summary>
/// Gets a rid list (eg. field list)
/// </summary>
/// <param name="tableSource">Source table, eg. <c>TypeDef</c></param>
/// <param name="tableSourceRid">Row ID in <paramref name="tableSource"/></param>
/// <param name="colIndex">Column index in <paramref name="tableSource"/>, eg. 4 for <c>TypeDef.FieldList</c></param>
/// <param name="tableDest">Destination table, eg. <c>Field</c></param>
/// <returns>A new <see cref="RidList"/> instance</returns>
private RidList GetRidList(MDTable tableSource, uint tableSourceRid, int colIndex, MDTable tableDest)
{
var column = tableSource.TableInfo.Columns[colIndex];
uint startRid, nextListRid;
bool hasNext;
#if THREAD_SAFE
tablesStream.theLock.EnterWriteLock(); try {
#endif
if (!tablesStream.ReadColumn_NoLock(tableSource, tableSourceRid, column, out startRid))
{
return(RidList.Empty);
}
hasNext = tablesStream.ReadColumn_NoLock(tableSource, tableSourceRid + 1, column, out nextListRid);
#if THREAD_SAFE
}
finally { tablesStream.theLock.ExitWriteLock(); }
#endif
uint lastRid = tableDest.Rows + 1;
if (startRid == 0 || startRid >= lastRid)
{
return(RidList.Empty);
}
uint endRid = hasNext ? nextListRid : lastRid;
if (endRid < startRid)
{
endRid = startRid;
}
if (endRid > lastRid)
{
endRid = lastRid;
}
return(new ContiguousRidList(startRid, endRid - startRid));
}
