public static async Task <Tuple <bool, byte[]> > FillBuffer(IStorageFile file, UploadablePart part)
{
try
{
if (part.ParentItem.FileNotFound)
{
return(new Tuple <bool, byte[]>(false, null));
}
System.Diagnostics.Debug.WriteLine("FillBuffer part=" + part.FilePart);
using (var inStream = await file.OpenSequentialReadAsync())
{
using (var stream = inStream.AsStreamForRead())
//using (var inStream = stream.GetInputStreamAt((ulong) part.Position))
{
stream.Seek(part.Position, SeekOrigin.Begin);
var bytes = new byte[part.Count];
stream.Read(bytes, 0, bytes.Length);
//using (var reader = new DataReader(inStream))
//{
// await reader.LoadAsync((uint) bytes.Length);
// reader.ReadBytes(bytes);
//}
// encrypting part
if (part.ParentItem.Key != null &&
part.ParentItem.IV != null)
{
var key = part.ParentItem.Key;
var iv = part.FilePart.Value == 0 ? part.ParentItem.IV : part.IV;
if (iv == null)
{
return(new Tuple <bool, byte[]>(true, null));
}
byte[] nextIV;
var encryptedBytes = Utils.AesIge(bytes, key.Data, iv.Data, true, out nextIV);
bytes = encryptedBytes;
var nextPartId = part.FilePart.Value + 1;
if (part.ParentItem.Parts.Count > nextPartId)
{
part.ParentItem.Parts[nextPartId].IV = TLString.FromBigEndianData(nextIV);
}
}
return(new Tuple <bool, byte[]>(true, bytes));
}
}
}
catch (FileNotFoundException ex)
{
Logs.Log.Write(string.Format("FileUtils.FillBuffer bytes=null position={0} count={1} ex={2}", part.Position, part.Count, ex));
Execute.ShowDebugMessage("FillBuffer FileNotFoundException\n" + ex);
return(new Tuple <bool, byte[]>(false, null));
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("FillBuffer ex part=" + part.FilePart);
Logs.Log.Write(string.Format("FileUtils.FillBuffer bytes=null position={0} count={1} ex={2}", part.Position, part.Count, ex));
Execute.ShowDebugMessage("FillBuffer Exception\n" + ex);
return(new Tuple <bool, byte[]>(true, null));
}
}