private void SwitchModeIfNecessary()
{
if (this._isolatedStorageMode)
{
if (this._isolatedStorageStream.Length < this._lowWaterMark)
{
if (this._isolatedStorageStream.Length > 0L)
{
MemoryStreamBlock item = new MemoryStreamBlock(this._trackingMemoryStreamFactory.Create((int)this._isolatedStorageStream.Length), 0L);
this._isolatedStorageStream.Seek(0L, SeekOrigin.Begin);
item.Stream.Seek(0L, SeekOrigin.Begin);
PackagingUtilities.CopyStream(this._isolatedStorageStream, item.Stream, 0x7fffffffffffffffL, 0x80000);
this._memoryStreamList.Add(item);
}
this._isolatedStorageMode = false;
this._isolatedStorageStream.SetLength(0L);
this._isolatedStorageStream.Flush();
}
}
else if (this._trackingMemoryStreamFactory.CurrentMemoryConsumption > this._highWaterMark)
{
this.EnsureIsolatedStoreStream();
this.CopyMemoryBlocksToStream(this._isolatedStorageStream);
this._isolatedStorageMode = true;
foreach (MemoryStreamBlock block2 in this._memoryStreamList)
{
block2.Stream.Close();
}
this._memoryStreamList.Clear();
}
}
internal void WriteToStream(Stream stream)
{
if (this._isolatedStorageMode)
{
this._isolatedStorageStream.Seek(0L, SeekOrigin.Begin);
PackagingUtilities.CopyStream(this._isolatedStorageStream, stream, 0x7fffffffffffffffL, 0x80000);
}
else
{
this.CopyMemoryBlocksToStream(stream);
}
}
internal static PreSaveNotificationScanControlInstruction CommonPreSaveNotificationHandler(Stream stream, long offset, long size, long onDiskOffset, long onDiskSize, ref SparseMemoryStream cachePrefixStream)
{
if (size != 0L)
{
long num2;
long num4;
if (cachePrefixStream != null)
{
onDiskOffset += cachePrefixStream.Length;
onDiskSize -= cachePrefixStream.Length;
}
if (onDiskSize == 0L)
{
return(PreSaveNotificationScanControlInstruction.Continue);
}
PackagingUtilities.CalculateOverlap(onDiskOffset, onDiskSize, offset, size, out num4, out num2);
if (num2 <= 0L)
{
if (onDiskOffset <= offset)
{
return(PreSaveNotificationScanControlInstruction.Continue);
}
return(PreSaveNotificationScanControlInstruction.Stop);
}
long bytesToCopy = (num4 + num2) - onDiskOffset;
if (cachePrefixStream == null)
{
cachePrefixStream = new SparseMemoryStream(0x19000L, 0xa00000L);
}
else
{
cachePrefixStream.Seek(0L, SeekOrigin.End);
}
stream.Seek(onDiskOffset, SeekOrigin.Begin);
if (PackagingUtilities.CopyStream(stream, cachePrefixStream, bytesToCopy, 0x1000) != bytesToCopy)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
if ((onDiskOffset + onDiskSize) < (offset + size))
{
return(PreSaveNotificationScanControlInstruction.Continue);
}
}
return(PreSaveNotificationScanControlInstruction.Stop);
}