/// <summary>
/// Initializes a new instance of the <see cref="VirtualFileStream" /> class.
/// </summary>
/// <param name="internalStream">The internal stream.</param>
/// <param name="startPosition">The start position.</param>
/// <param name="endPosition">The end position.</param>
/// <param name="disposeInternalStream">if set to <c>true</c> this instance has ownership of the internal stream and will dispose it].</param>
/// <exception cref="System.ArgumentException">startPosition and endPosition doesn't fit inside current bounds</exception>
/// <exception cref="System.NotSupportedException">Attempted to create a VirtualFileStream from a Stream which doesn't support seeking.</exception>
public VirtualFileStream(Stream internalStream, long startPosition = 0, long endPosition = -1, bool disposeInternalStream = true, bool seekToBeginning = true)
{
this.disposeInternalStream = disposeInternalStream;
if (internalStream is VirtualFileStream)
{
virtualFileStream = (VirtualFileStream)internalStream;
internalStream = virtualFileStream.InternalStream;
startPosition += virtualFileStream.startPosition;
if (endPosition == -1)
endPosition = virtualFileStream.endPosition;
else
endPosition += virtualFileStream.startPosition;
if (startPosition < virtualFileStream.startPosition || ((endPosition < startPosition || endPosition > virtualFileStream.endPosition) && virtualFileStream.endPosition != -1))
throw new ArgumentException("startPosition and endPosition doesn't fit inside current bounds");
if (!virtualFileStream.disposeInternalStream)
this.disposeInternalStream = false;
}
InternalStream = internalStream;
this.startPosition = startPosition;
this.endPosition = endPosition;
if (seekToBeginning)
InternalStream.Seek(startPosition, SeekOrigin.Begin);
}
protected override void Dispose(bool disposing)
{
if (virtualFileStream != null)
virtualFileStream.Dispose();
virtualFileStream = null;
if (disposeInternalStream && InternalStream != null)
{
InternalStream.Dispose();
}
InternalStream = null;
base.Dispose(disposing);
}
protected override void Dispose(bool disposing)
{
if (virtualFileStream != null)
{
virtualFileStream.Dispose();
}
virtualFileStream = null;
if (disposeInternalStream && InternalStream != null)
{
InternalStream.Dispose();
}
InternalStream = null;
base.Dispose(disposing);
}
/// <summary>
/// Initializes a new instance of the <see cref="VirtualFileStream" /> class.
/// </summary>
/// <param name="internalStream">The internal stream.</param>
/// <param name="startPosition">The start position.</param>
/// <param name="endPosition">The end position.</param>
/// <param name="disposeInternalStream">if set to <c>true</c> this instance has ownership of the internal stream and will dispose it].</param>
/// <exception cref="System.ArgumentException">startPosition and endPosition doesn't fit inside current bounds</exception>
/// <exception cref="System.NotSupportedException">Attempted to create a VirtualFileStream from a Stream which doesn't support seeking.</exception>
public VirtualFileStream(Stream internalStream, long startPosition = 0, long endPosition = -1, bool disposeInternalStream = true, bool seekToBeginning = true)
{
this.disposeInternalStream = disposeInternalStream;
if (internalStream is VirtualFileStream)
{
virtualFileStream = (VirtualFileStream)internalStream;
internalStream = virtualFileStream.InternalStream;
startPosition += virtualFileStream.startPosition;
if (endPosition == -1)
{
endPosition = virtualFileStream.endPosition;
}
else
{
endPosition += virtualFileStream.startPosition;
}
if (startPosition < virtualFileStream.startPosition || ((endPosition < startPosition || endPosition > virtualFileStream.endPosition) && virtualFileStream.endPosition != -1))
{
throw new ArgumentException("startPosition and endPosition doesn't fit inside current bounds");
}
if (!virtualFileStream.disposeInternalStream)
{
this.disposeInternalStream = false;
}
}
InternalStream = internalStream;
this.startPosition = startPosition;
this.endPosition = endPosition;
if (seekToBeginning)
{
InternalStream.Seek(startPosition, SeekOrigin.Begin);
}
}