/// <summary>
/// Close this stream and dispose the underlying source. If dispose is not explicitly called then the underlying source will stay allocated until the GC gets this object
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
AssetRep.Dispose();
AssetRep = null;
Lib.Dispose();
Lib = null;
}
}
/// <summary>
/// Read into the specified buffer from offset, the count number of bytes.
/// see http://msdn.microsoft.com/en-us/library/system.io.stream.read.aspx
/// </summary>
public override int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", offset, "offset is negative");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count", count, "count is negative");
}
if (AssetRep == null)
{
throw new ObjectDisposedException("AssetLibraryReadStream", "Can not call methods on the stream after it is closed");
}
NSError error;
int bytesRead;
// Using a fixed pointer to stop buffer being moved by the GC during the copy
unsafe
{
fixed(byte *pointer = buffer)
{
bytesRead = (int)AssetRep.GetBytes((IntPtr)(pointer + offset), (long)Position, (uint)count, out error);
}
}
if (error != null)
{
throw new IOException(string.Format
(
"Error reading bytes from: {1}{0}offset:{2}{0}count:{3}{0}message:{4}",
Environment.NewLine,
AssetRep.Url.AbsoluteString,
offset,
count,
error.LocalizedDescription
));
}
Position += bytesRead;
return(bytesRead);
}