/// <summary>
/// Initializes a new instance of the <see cref="SeekableStream"/> class.
/// </summary>
/// <param name="innerStream">The inner stream.</param>
/// <param name="length">The length.</param>
public SeekableStream(Stream innerStream, long length)
{
if (innerStream == null)
{
throw new ArgumentNullException("innerStream");
}
_parentStream = innerStream;
if (innerStream.CanSeek)
{
_innerStream = innerStream;
_length = innerStream.Length;
}
else
{
length = _length;
if (length >= 0 && length < (1024 * 1024)) // Less than 1 MB, use memory
{
byte[] buffer = new byte[length];
innerStream.Read(buffer, 0, buffer.Length);
innerStream.Close();
_innerStream = new MemoryStream(buffer, false);
_innerStream.Position = 0;
}
else
{
FileStream tempStream = new DeleteOnCloseStream(true);
try
{
// For now, just read the file at once; we should optimize this to read when needed
QQnPath.CopyStream(innerStream, tempStream);
tempStream.Position = 0;
_innerStream = tempStream;
}
finally
{
if (_innerStream != tempStream)
{
tempStream.Close();
}
}
}
}
}
