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();
}
}
private MemoryStreamBlock ConstructMemoryStreamFromWriteRequest(byte[] buffer, long writeRequestOffset, int writeRequestSize, int bufferOffset)
{
MemoryStreamBlock block = new MemoryStreamBlock(this._trackingMemoryStreamFactory.Create(writeRequestSize), writeRequestOffset);
block.Stream.Seek(0L, SeekOrigin.Begin);
block.Stream.Write(buffer, bufferOffset, writeRequestSize);
return(block);
}
private bool CanCollapseWithPreviousBlock(MemoryStreamBlock memStreamBlock, long offset, long length)
{
if (!this._autoCloseSmallBlockGaps || (memStreamBlock == null))
{
return(false);
}
long num = offset - (memStreamBlock.Offset + memStreamBlock.Stream.Length);
return((num <= 100L) && (((num + length) + memStreamBlock.Stream.Length) <= 0x7fffffffL));
}
private MemoryStreamBlock GetSearchBlockForOffset(long offset)
{
if (this._searchBlock == null)
{
this._searchBlock = new MemoryStreamBlock(null, offset);
}
else
{
this._searchBlock.Offset = offset;
}
return(this._searchBlock);
}
public override int Read(byte[] buffer, int offset, int count)
{
int num3;
this.CheckDisposed();
PackagingUtilities.VerifyStreamReadArgs(this, buffer, offset, count);
if (count == 0)
{
return(0);
}
if (this._currentStreamLength <= this._currentStreamPosition)
{
return(0);
}
int num2 = (int)Math.Min((long)count, this._currentStreamLength - this._currentStreamPosition);
if (this._isolatedStorageMode)
{
this._isolatedStorageStream.Seek(this._currentStreamPosition, SeekOrigin.Begin);
num3 = this._isolatedStorageStream.Read(buffer, offset, num2);
}
else
{
Array.Clear(buffer, offset, num2);
int num = this._memoryStreamList.BinarySearch(this.GetSearchBlockForOffset(this._currentStreamPosition));
if (num < 0)
{
num = ~num;
}
while (num < this._memoryStreamList.Count)
{
long num4;
long num5;
MemoryStreamBlock block = this._memoryStreamList[num];
PackagingUtilities.CalculateOverlap(block.Offset, (long)((int)block.Stream.Length), this._currentStreamPosition, (long)num2, out num5, out num4);
if (num4 <= 0L)
{
break;
}
Array.Copy(block.Stream.GetBuffer(), (int)(num5 - block.Offset), buffer, (int)((offset + num5) - this._currentStreamPosition), (int)num4);
num++;
}
num3 = num2;
}
this._currentStreamPosition += num3;
return(num3);
}
public override void SetLength(long newLength)
{
this.CheckDisposed();
if (newLength < 0L)
{
throw new ArgumentOutOfRangeException("newLength");
}
if (this._currentStreamLength != newLength)
{
if (this._isolatedStorageMode)
{
this._isolatedStorageStream.SetLength(newLength);
}
else if (this._currentStreamLength > newLength)
{
int index = this._memoryStreamList.BinarySearch(this.GetSearchBlockForOffset(newLength));
if (index < 0)
{
index = ~index;
}
else
{
MemoryStreamBlock block = this._memoryStreamList[index];
long num3 = newLength - block.Offset;
if (num3 > 0L)
{
block.Stream.SetLength(num3);
index++;
}
}
for (int i = index; i < this._memoryStreamList.Count; i++)
{
this._memoryStreamList[i].Stream.Close();
}
this._memoryStreamList.RemoveRange(index, this._memoryStreamList.Count - index);
}
this._currentStreamLength = newLength;
if (this._currentStreamPosition > this._currentStreamLength)
{
this._currentStreamPosition = this._currentStreamLength;
}
}
this.SwitchModeIfNecessary();
}
private void WriteAndCollapseBlocks(byte[] buffer, int offset, int count)
{
int index = this._memoryStreamList.BinarySearch(this.GetSearchBlockForOffset(this._currentStreamPosition));
bool flag = false;
MemoryStreamBlock item = null;
MemoryStreamBlock memStreamBlock = null;
if (index < 0)
{
index = ~index;
if (index != 0)
{
memStreamBlock = this._memoryStreamList[index - 1];
}
if (this.CanCollapseWithPreviousBlock(memStreamBlock, this._currentStreamPosition, (long)count))
{
memStreamBlock.Stream.Seek(0L, SeekOrigin.End);
this.SkipWrite(memStreamBlock.Stream, memStreamBlock.EndOffset, this._currentStreamPosition);
memStreamBlock.Stream.Write(buffer, offset, count);
flag = true;
}
}
else
{
memStreamBlock = this._memoryStreamList[index];
if ((memStreamBlock.Stream.Length + count) <= 0x7fffffffL)
{
memStreamBlock.Stream.Seek(this._currentStreamPosition - memStreamBlock.Offset, SeekOrigin.Begin);
memStreamBlock.Stream.Write(buffer, offset, count);
flag = true;
index++;
}
else
{
memStreamBlock.Stream.SetLength(this._currentStreamPosition - item.Offset);
}
}
if (!flag)
{
memStreamBlock = this.ConstructMemoryStreamFromWriteRequest(buffer, this._currentStreamPosition, count, offset);
this._memoryStreamList.Insert(index, memStreamBlock);
index++;
}
this._currentStreamPosition += count;
int num2 = index;
while (num2 < this._memoryStreamList.Count)
{
if (this._memoryStreamList[num2].EndOffset > this._currentStreamPosition)
{
break;
}
this._memoryStreamList[num2].Stream.Close();
num2++;
}
if ((num2 - index) > 0)
{
this._memoryStreamList.RemoveRange(index, num2 - index);
}
long num3 = -1L;
if (index < this._memoryStreamList.Count)
{
item = this._memoryStreamList[index];
num3 = this._currentStreamPosition - item.Offset;
}
else
{
item = null;
}
if (num3 <= 0L)
{
if ((item != null) && this.CanCollapseWithPreviousBlock(memStreamBlock, item.Offset, item.Stream.Length))
{
this._memoryStreamList.RemoveAt(index);
memStreamBlock.Stream.Seek(0L, SeekOrigin.End);
this.SkipWrite(memStreamBlock.Stream, this._currentStreamPosition, item.Offset);
memStreamBlock.Stream.Write(item.Stream.GetBuffer(), 0, (int)item.Stream.Length);
}
}
else
{
this._memoryStreamList.RemoveAt(index);
int num4 = (int)(item.Stream.Length - num3);
if ((memStreamBlock.Stream.Length + num4) <= 0x7fffffffL)
{
memStreamBlock.Stream.Seek(0L, SeekOrigin.End);
memStreamBlock.Stream.Write(item.Stream.GetBuffer(), (int)num3, num4);
}
else
{
item = this.ConstructMemoryStreamFromWriteRequest(item.Stream.GetBuffer(), this._currentStreamPosition, num4, (int)num3);
this._memoryStreamList.Insert(index, item);
}
}
}
