/// <summary>
/// See <see cref = "IByteProvider.DeleteBytes" /> for more information.
/// </summary>
public void DeleteBytes(long index, long length)
{
try {
var bytesToDelete = length;
// Find the first block affected.
long blockOffset;
var block = GetDataBlock(index, out blockOffset);
// Truncate or remove each block as necessary.
while ((bytesToDelete > 0) && (block != null))
{
var blockLength = block.Length;
var nextBlock = block.NextBlock;
// Delete the appropriate section from the block (this may result in two blocks or a zero length block).
var count = Math.Min(bytesToDelete, blockLength - (index - blockOffset));
block.RemoveBytes(index - blockOffset, count);
if (block.Length == 0)
{
_dataMap.Remove(block);
if (_dataMap.FirstBlock == null)
{
_dataMap.AddFirst(new MemoryDataBlock(new byte[0]));
}
}
bytesToDelete -= count;
blockOffset += block.Length;
block = (bytesToDelete > 0) ? nextBlock : null;
}
} finally {
Length -= length;
OnLengthChanged(EventArgs.Empty);
OnChanged(EventArgs.Empty);
}
}
void ReInitialize()
{
_dataMap = new DataMap();
_dataMap.AddFirst(new FileDataBlock(0, _stream.Length));
_totalLength = _stream.Length;
}
void ReInitialize()
{
_dataMap = new DataMap();
_dataMap.AddFirst(new FileDataBlock(0, _stream.Length));
_totalLength = _stream.Length;
}
