public void DeleteBytes(long index, long length)
{
try
{
long num2;
DataBlock nextBlock;
long num = length;
for (DataBlock block = this.GetDataBlock(index, out num2); (num > 0L) && (block != null); block = (num > 0L) ? nextBlock : null)
{
long num3 = block.Length;
nextBlock = block.NextBlock;
long count = Math.Min(num, num3 - (index - num2));
block.RemoveBytes(index - num2, count);
if (block.Length == 0L)
{
this._dataMap.Remove(block);
if (this._dataMap.FirstBlock == null)
{
this._dataMap.AddFirst(new MemoryDataBlock(new byte[0]));
}
}
num -= count;
num2 += block.Length;
}
}
finally
{
this._totalLength -= length;
this.OnLengthChanged(EventArgs.Empty);
this.OnChanged(EventArgs.Empty);
}
}
